1	// SPDX-License-Identifier: GPL-2.0-or-later
2	/*
3	* ibmvfc.c -- driver for IBM Power Virtual Fibre Channel Adapter
4	*
5	* Written By: Brian King <brking@linux.vnet.ibm.com>, IBM Corporation
6	*
7	* Copyright (C) IBM Corporation, 2008
8	*/
9
10	#include <linux/module.h>
11	#include <linux/moduleparam.h>
12	#include <linux/dma-mapping.h>
13	#include <linux/dmapool.h>
14	#include <linux/delay.h>
15	#include <linux/interrupt.h>
16	#include <linux/irqdomain.h>
17	#include <linux/kthread.h>
18	#include <linux/slab.h>
19	#include <linux/of.h>
20	#include <linux/pm.h>
21	#include <linux/stringify.h>
22	#include <linux/bsg-lib.h>
23	#include <asm/firmware.h>
24	#include <asm/irq.h>
25	#include <asm/vio.h>
26	#include <scsi/scsi.h>
27	#include <scsi/scsi_cmnd.h>
28	#include <scsi/scsi_host.h>
29	#include <scsi/scsi_device.h>
30	#include <scsi/scsi_tcq.h>
31	#include <scsi/scsi_transport_fc.h>
32	#include <scsi/scsi_bsg_fc.h>
33	#include "ibmvfc.h"
34
35	static unsigned int init_timeout = IBMVFC_INIT_TIMEOUT;
36	static unsigned int default_timeout = IBMVFC_DEFAULT_TIMEOUT;
37	static u64 max_lun = IBMVFC_MAX_LUN;
38	static unsigned int max_targets = IBMVFC_MAX_TARGETS;
39	static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
40	static u16 scsi_qdepth = IBMVFC_SCSI_QDEPTH;
41	static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
42	static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
43	static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
44	static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
45	static unsigned int mq_enabled = IBMVFC_MQ;
46	static unsigned int nr_scsi_hw_queues = IBMVFC_SCSI_HW_QUEUES;
47	static unsigned int nr_scsi_channels = IBMVFC_SCSI_CHANNELS;
48	static unsigned int mig_channels_only = IBMVFC_MIG_NO_SUB_TO_CRQ;
49	static unsigned int mig_no_less_channels = IBMVFC_MIG_NO_N_TO_M;
50
51	static LIST_HEAD(ibmvfc_head);
52	static DEFINE_SPINLOCK(ibmvfc_driver_lock);
53	static struct scsi_transport_template *ibmvfc_transport_template;
54
55	MODULE_DESCRIPTION("IBM Virtual Fibre Channel Driver");
56	MODULE_AUTHOR("Brian King <brking@linux.vnet.ibm.com>");
57	MODULE_LICENSE("GPL");
58	MODULE_VERSION(IBMVFC_DRIVER_VERSION);
59
60	module_param_named(mq, mq_enabled, uint, S_IRUGO);
61	MODULE_PARM_DESC(mq, "Enable multiqueue support. "
62	"[Default=" __stringify(IBMVFC_MQ) "]");
63	module_param_named(scsi_host_queues, nr_scsi_hw_queues, uint, S_IRUGO);
64	MODULE_PARM_DESC(scsi_host_queues, "Number of SCSI Host submission queues. "
65	"[Default=" __stringify(IBMVFC_SCSI_HW_QUEUES) "]");
66	module_param_named(scsi_hw_channels, nr_scsi_channels, uint, S_IRUGO);
67	MODULE_PARM_DESC(scsi_hw_channels, "Number of hw scsi channels to request. "
68	"[Default=" __stringify(IBMVFC_SCSI_CHANNELS) "]");
69	module_param_named(mig_channels_only, mig_channels_only, uint, S_IRUGO);
70	MODULE_PARM_DESC(mig_channels_only, "Prevent migration to non-channelized system. "
71	"[Default=" __stringify(IBMVFC_MIG_NO_SUB_TO_CRQ) "]");
72	module_param_named(mig_no_less_channels, mig_no_less_channels, uint, S_IRUGO);
73	MODULE_PARM_DESC(mig_no_less_channels, "Prevent migration to system with less channels. "
74	"[Default=" __stringify(IBMVFC_MIG_NO_N_TO_M) "]");
75
76	module_param_named(init_timeout, init_timeout, uint, S_IRUGO | S_IWUSR);
77	MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds. "
78	"[Default=" __stringify(IBMVFC_INIT_TIMEOUT) "]");
79	module_param_named(default_timeout, default_timeout, uint, S_IRUGO | S_IWUSR);
80	MODULE_PARM_DESC(default_timeout,
81	"Default timeout in seconds for initialization and EH commands. "
82	"[Default=" __stringify(IBMVFC_DEFAULT_TIMEOUT) "]");
83	module_param_named(max_requests, max_requests, uint, S_IRUGO);
84	MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter. "
85	"[Default=" __stringify(IBMVFC_MAX_REQUESTS_DEFAULT) "]");
86	module_param_named(scsi_qdepth, scsi_qdepth, ushort, S_IRUGO);
87	MODULE_PARM_DESC(scsi_qdepth, "Maximum scsi command depth per adapter queue. "
88	"[Default=" __stringify(IBMVFC_SCSI_QDEPTH) "]");
89	module_param_named(max_lun, max_lun, ullong, S_IRUGO);
90	MODULE_PARM_DESC(max_lun, "Maximum allowed LUN. "
91	"[Default=" __stringify(IBMVFC_MAX_LUN) "]");
92	module_param_named(max_targets, max_targets, uint, S_IRUGO);
93	MODULE_PARM_DESC(max_targets, "Maximum allowed targets. "
94	"[Default=" __stringify(IBMVFC_MAX_TARGETS) "]");
95	module_param_named(disc_threads, disc_threads, uint, S_IRUGO);
96	MODULE_PARM_DESC(disc_threads, "Number of device discovery threads to use. "
97	"[Default=" __stringify(IBMVFC_MAX_DISC_THREADS) "]");
98	module_param_named(debug, ibmvfc_debug, uint, S_IRUGO | S_IWUSR);
99	MODULE_PARM_DESC(debug, "Enable driver debug information. "
100	"[Default=" __stringify(IBMVFC_DEBUG) "]");
101	module_param_named(log_level, log_level, uint, 0);
102	MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
103	"[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
104	module_param_named(cls3_error, cls3_error, uint, 0);
105	MODULE_PARM_DESC(cls3_error, "Enable FC Class 3 Error Recovery. "
106	"[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
107
108	static const struct {
109	u16 status;
110	u16 error;
111	u8 result;
112	u8 retry;
113	int log;
114	char *name;
115	} cmd_status [] = {
116	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_ESTABLISH, DID_ERROR, 1, 1, "unable to establish" },
117	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_FAULT, DID_OK, 1, 0, "transport fault" },
118	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CMD_TIMEOUT, DID_TIME_OUT, 1, 1, "command timeout" },
119	{ IBMVFC_FABRIC_MAPPED, IBMVFC_ENETDOWN, DID_TRANSPORT_DISRUPTED, 1, 1, "network down" },
120	{ IBMVFC_FABRIC_MAPPED, IBMVFC_HW_FAILURE, DID_ERROR, 1, 1, "hardware failure" },
121	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DOWN_ERR, DID_REQUEUE, 0, 0, "link down" },
122	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_DEAD_ERR, DID_ERROR, 0, 0, "link dead" },
123	{ IBMVFC_FABRIC_MAPPED, IBMVFC_UNABLE_TO_REGISTER, DID_ERROR, 1, 1, "unable to register" },
124	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_BUSY, DID_BUS_BUSY, 1, 0, "transport busy" },
125	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
126	{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
127	{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
128	{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
129	{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
130
131	{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
132	{ IBMVFC_VIOS_FAILURE, IBMVFC_SW_FAILURE, DID_ERROR, 0, 1, "software failure" },
133	{ IBMVFC_VIOS_FAILURE, IBMVFC_INVALID_PARAMETER, DID_ERROR, 0, 1, "invalid parameter" },
134	{ IBMVFC_VIOS_FAILURE, IBMVFC_MISSING_PARAMETER, DID_ERROR, 0, 1, "missing parameter" },
135	{ IBMVFC_VIOS_FAILURE, IBMVFC_HOST_IO_BUS, DID_ERROR, 1, 1, "host I/O bus failure" },
136	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED, DID_ERROR, 0, 1, "transaction cancelled" },
137	{ IBMVFC_VIOS_FAILURE, IBMVFC_TRANS_CANCELLED_IMPLICIT, DID_ERROR, 0, 1, "transaction cancelled implicit" },
138	{ IBMVFC_VIOS_FAILURE, IBMVFC_INSUFFICIENT_RESOURCE, DID_REQUEUE, 1, 1, "insufficient resources" },
139	{ IBMVFC_VIOS_FAILURE, IBMVFC_PLOGI_REQUIRED, DID_ERROR, 0, 1, "port login required" },
140	{ IBMVFC_VIOS_FAILURE, IBMVFC_COMMAND_FAILED, DID_ERROR, 1, 1, "command failed" },
141
142	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_ELS_CMD_CODE, DID_ERROR, 0, 1, "invalid ELS command code" },
143	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_VERSION, DID_ERROR, 0, 1, "invalid version level" },
144	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_ERROR, DID_ERROR, 1, 1, "logical error" },
145	{ IBMVFC_FC_FAILURE, IBMVFC_INVALID_CT_IU_SIZE, DID_ERROR, 0, 1, "invalid CT_IU size" },
146	{ IBMVFC_FC_FAILURE, IBMVFC_LOGICAL_BUSY, DID_REQUEUE, 1, 0, "logical busy" },
147	{ IBMVFC_FC_FAILURE, IBMVFC_PROTOCOL_ERROR, DID_ERROR, 1, 1, "protocol error" },
148	{ IBMVFC_FC_FAILURE, IBMVFC_UNABLE_TO_PERFORM_REQ, DID_ERROR, 1, 1, "unable to perform request" },
149	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_NOT_SUPPORTED, DID_ERROR, 0, 0, "command not supported" },
150	{ IBMVFC_FC_FAILURE, IBMVFC_SERVER_NOT_AVAIL, DID_ERROR, 0, 1, "server not available" },
151	{ IBMVFC_FC_FAILURE, IBMVFC_CMD_IN_PROGRESS, DID_ERROR, 0, 1, "command already in progress" },
152	{ IBMVFC_FC_FAILURE, IBMVFC_VENDOR_SPECIFIC, DID_ERROR, 1, 1, "vendor specific" },
153
154	{ IBMVFC_FC_SCSI_ERROR, 0, DID_OK, 1, 0, "SCSI error" },
155	{ IBMVFC_FC_SCSI_ERROR, IBMVFC_COMMAND_FAILED, DID_ERROR, 0, 1, "PRLI to device failed." },
156	};
157
158	static void ibmvfc_npiv_login(struct ibmvfc_host *);
159	static void ibmvfc_tgt_send_prli(struct ibmvfc_target *);
160	static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *);
161	static void ibmvfc_tgt_query_target(struct ibmvfc_target *);
162	static void ibmvfc_npiv_logout(struct ibmvfc_host *);
163	static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *);
164	static void ibmvfc_tgt_move_login(struct ibmvfc_target *);
165
166	static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
167	static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *, struct ibmvfc_channels *);
168
169	static const char *unknown_error = "unknown error";
170
171	static long h_reg_sub_crq(unsigned long unit_address, unsigned long ioba,
172	unsigned long length, unsigned long *cookie,
173	unsigned long *irq)
174	{
175	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
176	long rc;
177
178	rc = plpar_hcall(H_REG_SUB_CRQ, retbuf, unit_address, ioba, length);
179	*cookie = retbuf[0];
180	*irq = retbuf[1];
181
182	return rc;
183	}
184
185	static int ibmvfc_check_caps(struct ibmvfc_host *vhost, unsigned long cap_flags)
186	{
187	u64 host_caps = be64_to_cpu(vhost->login_buf->resp.capabilities);
188
189	return (host_caps & cap_flags) ? 1 : 0;
190	}
191
192	static struct ibmvfc_fcp_cmd_iu *ibmvfc_get_fcp_iu(struct ibmvfc_host *vhost,
193	struct ibmvfc_cmd *vfc_cmd)
194	{
195	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
196	return &vfc_cmd->v2.iu;
197	else
198	return &vfc_cmd->v1.iu;
199	}
200
201	static struct ibmvfc_fcp_rsp *ibmvfc_get_fcp_rsp(struct ibmvfc_host *vhost,
202	struct ibmvfc_cmd *vfc_cmd)
203	{
204	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
205	return &vfc_cmd->v2.rsp;
206	else
207	return &vfc_cmd->v1.rsp;
208	}
209
210	#ifdef CONFIG_SCSI_IBMVFC_TRACE
211	/**
212	* ibmvfc_trc_start - Log a start trace entry
213	* @evt: ibmvfc event struct
214	*
215	**/
216	static void ibmvfc_trc_start(struct ibmvfc_event *evt)
217	{
218	struct ibmvfc_host *vhost = evt->vhost;
219	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
220	struct ibmvfc_mad_common *mad = &evt->iu.mad_common;
221	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
222	struct ibmvfc_trace_entry *entry;
223	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
224
225	entry = &vhost->trace[index];
226	entry->evt = evt;
227	entry->time = jiffies;
228	entry->fmt = evt->crq.format;
229	entry->type = IBMVFC_TRC_START;
230
231	switch (entry->fmt) {
232	case IBMVFC_CMD_FORMAT:
233	entry->op_code = iu->cdb[0];
234	entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
235	entry->lun = scsilun_to_int(&iu->lun);
236	entry->tmf_flags = iu->tmf_flags;
237	entry->u.start.xfer_len = be32_to_cpu(iu->xfer_len);
238	break;
239	case IBMVFC_MAD_FORMAT:
240	entry->op_code = be32_to_cpu(mad->opcode);
241	break;
242	default:
243	break;
244	}
245	}
246
247	/**
248	* ibmvfc_trc_end - Log an end trace entry
249	* @evt: ibmvfc event struct
250	*
251	**/
252	static void ibmvfc_trc_end(struct ibmvfc_event *evt)
253	{
254	struct ibmvfc_host *vhost = evt->vhost;
255	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
256	struct ibmvfc_mad_common *mad = &evt->xfer_iu->mad_common;
257	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
258	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
259	struct ibmvfc_trace_entry *entry;
260	int index = atomic_inc_return(&vhost->trace_index) & IBMVFC_TRACE_INDEX_MASK;
261
262	entry = &vhost->trace[index];
263	entry->evt = evt;
264	entry->time = jiffies;
265	entry->fmt = evt->crq.format;
266	entry->type = IBMVFC_TRC_END;
267
268	switch (entry->fmt) {
269	case IBMVFC_CMD_FORMAT:
270	entry->op_code = iu->cdb[0];
271	entry->scsi_id = be64_to_cpu(vfc_cmd->tgt_scsi_id);
272	entry->lun = scsilun_to_int(&iu->lun);
273	entry->tmf_flags = iu->tmf_flags;
274	entry->u.end.status = be16_to_cpu(vfc_cmd->status);
275	entry->u.end.error = be16_to_cpu(vfc_cmd->error);
276	entry->u.end.fcp_rsp_flags = rsp->flags;
277	entry->u.end.rsp_code = rsp->data.info.rsp_code;
278	entry->u.end.scsi_status = rsp->scsi_status;
279	break;
280	case IBMVFC_MAD_FORMAT:
281	entry->op_code = be32_to_cpu(mad->opcode);
282	entry->u.end.status = be16_to_cpu(mad->status);
283	break;
284	default:
285	break;
286
287	}
288	}
289
290	#else
291	#define ibmvfc_trc_start(evt) do { } while (0)
292	#define ibmvfc_trc_end(evt) do { } while (0)
293	#endif
294
295	/**
296	* ibmvfc_get_err_index - Find the index into cmd_status for the fcp response
297	* @status: status / error class
298	* @error: error
299	*
300	* Return value:
301	* index into cmd_status / -EINVAL on failure
302	**/
303	static int ibmvfc_get_err_index(u16 status, u16 error)
304	{
305	int i;
306
307	for (i = 0; i < ARRAY_SIZE(cmd_status); i++)
308	if ((cmd_status[i].status & status) == cmd_status[i].status &&
309	cmd_status[i].error == error)
310	return i;
311
312	return -EINVAL;
313	}
314
315	/**
316	* ibmvfc_get_cmd_error - Find the error description for the fcp response
317	* @status: status / error class
318	* @error: error
319	*
320	* Return value:
321	* error description string
322	**/
323	static const char *ibmvfc_get_cmd_error(u16 status, u16 error)
324	{
325	int rc = ibmvfc_get_err_index(status, error);
326	if (rc >= 0)
327	return cmd_status[rc].name;
328	return unknown_error;
329	}
330
331	/**
332	* ibmvfc_get_err_result - Find the scsi status to return for the fcp response
333	* @vhost: ibmvfc host struct
334	* @vfc_cmd: ibmvfc command struct
335	*
336	* Return value:
337	* SCSI result value to return for completed command
338	**/
339	static int ibmvfc_get_err_result(struct ibmvfc_host *vhost, struct ibmvfc_cmd *vfc_cmd)
340	{
341	int err;
342	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
343	int fc_rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
344
345	if ((rsp->flags & FCP_RSP_LEN_VALID) &&
346	((fc_rsp_len && fc_rsp_len != 4 && fc_rsp_len != 8) ||
347	rsp->data.info.rsp_code))
348	return DID_ERROR << 16;
349
350	err = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
351	if (err >= 0)
352	return rsp->scsi_status | (cmd_status[err].result << 16);
353	return rsp->scsi_status | (DID_ERROR << 16);
354	}
355
356	/**
357	* ibmvfc_retry_cmd - Determine if error status is retryable
358	* @status: status / error class
359	* @error: error
360	*
361	* Return value:
362	* 1 if error should be retried / 0 if it should not
363	**/
364	static int ibmvfc_retry_cmd(u16 status, u16 error)
365	{
366	int rc = ibmvfc_get_err_index(status, error);
367
368	if (rc >= 0)
369	return cmd_status[rc].retry;
370	return 1;
371	}
372
373	static const char *unknown_fc_explain = "unknown fc explain";
374
375	static const struct {
376	u16 fc_explain;
377	char *name;
378	} ls_explain [] = {
379	{ 0x00, "no additional explanation" },
380	{ 0x01, "service parameter error - options" },
381	{ 0x03, "service parameter error - initiator control" },
382	{ 0x05, "service parameter error - recipient control" },
383	{ 0x07, "service parameter error - received data field size" },
384	{ 0x09, "service parameter error - concurrent seq" },
385	{ 0x0B, "service parameter error - credit" },
386	{ 0x0D, "invalid N_Port/F_Port_Name" },
387	{ 0x0E, "invalid node/Fabric Name" },
388	{ 0x0F, "invalid common service parameters" },
389	{ 0x11, "invalid association header" },
390	{ 0x13, "association header required" },
391	{ 0x15, "invalid originator S_ID" },
392	{ 0x17, "invalid OX_ID-RX-ID combination" },
393	{ 0x19, "command (request) already in progress" },
394	{ 0x1E, "N_Port Login requested" },
395	{ 0x1F, "Invalid N_Port_ID" },
396	};
397
398	static const struct {
399	u16 fc_explain;
400	char *name;
401	} gs_explain [] = {
402	{ 0x00, "no additional explanation" },
403	{ 0x01, "port identifier not registered" },
404	{ 0x02, "port name not registered" },
405	{ 0x03, "node name not registered" },
406	{ 0x04, "class of service not registered" },
407	{ 0x06, "initial process associator not registered" },
408	{ 0x07, "FC-4 TYPEs not registered" },
409	{ 0x08, "symbolic port name not registered" },
410	{ 0x09, "symbolic node name not registered" },
411	{ 0x0A, "port type not registered" },
412	{ 0xF0, "authorization exception" },
413	{ 0xF1, "authentication exception" },
414	{ 0xF2, "data base full" },
415	{ 0xF3, "data base empty" },
416	{ 0xF4, "processing request" },
417	{ 0xF5, "unable to verify connection" },
418	{ 0xF6, "devices not in a common zone" },
419	};
420
421	/**
422	* ibmvfc_get_ls_explain - Return the FC Explain description text
423	* @status: FC Explain status
424	*
425	* Returns:
426	* error string
427	**/
428	static const char *ibmvfc_get_ls_explain(u16 status)
429	{
430	int i;
431
432	for (i = 0; i < ARRAY_SIZE(ls_explain); i++)
433	if (ls_explain[i].fc_explain == status)
434	return ls_explain[i].name;
435
436	return unknown_fc_explain;
437	}
438
439	/**
440	* ibmvfc_get_gs_explain - Return the FC Explain description text
441	* @status: FC Explain status
442	*
443	* Returns:
444	* error string
445	**/
446	static const char *ibmvfc_get_gs_explain(u16 status)
447	{
448	int i;
449
450	for (i = 0; i < ARRAY_SIZE(gs_explain); i++)
451	if (gs_explain[i].fc_explain == status)
452	return gs_explain[i].name;
453
454	return unknown_fc_explain;
455	}
456
457	static const struct {
458	enum ibmvfc_fc_type fc_type;
459	char *name;
460	} fc_type [] = {
461	{ IBMVFC_FABRIC_REJECT, "fabric reject" },
462	{ IBMVFC_PORT_REJECT, "port reject" },
463	{ IBMVFC_LS_REJECT, "ELS reject" },
464	{ IBMVFC_FABRIC_BUSY, "fabric busy" },
465	{ IBMVFC_PORT_BUSY, "port busy" },
466	{ IBMVFC_BASIC_REJECT, "basic reject" },
467	};
468
469	static const char *unknown_fc_type = "unknown fc type";
470
471	/**
472	* ibmvfc_get_fc_type - Return the FC Type description text
473	* @status: FC Type error status
474	*
475	* Returns:
476	* error string
477	**/
478	static const char *ibmvfc_get_fc_type(u16 status)
479	{
480	int i;
481
482	for (i = 0; i < ARRAY_SIZE(fc_type); i++)
483	if (fc_type[i].fc_type == status)
484	return fc_type[i].name;
485
486	return unknown_fc_type;
487	}
488
489	/**
490	* ibmvfc_set_tgt_action - Set the next init action for the target
491	* @tgt: ibmvfc target struct
492	* @action: action to perform
493	*
494	* Returns:
495	* 0 if action changed / non-zero if not changed
496	**/
497	static int ibmvfc_set_tgt_action(struct ibmvfc_target *tgt,
498	enum ibmvfc_target_action action)
499	{
500	int rc = -EINVAL;
501
502	switch (tgt->action) {
503	case IBMVFC_TGT_ACTION_LOGOUT_RPORT:
504	if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT ||
505	action == IBMVFC_TGT_ACTION_DEL_RPORT) {
506	tgt->action = action;
507	rc = 0;
508	}
509	break;
510	case IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT:
511	if (action == IBMVFC_TGT_ACTION_DEL_RPORT ||
512	action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
513	tgt->action = action;
514	rc = 0;
515	}
516	break;
517	case IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT:
518	if (action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
519	tgt->action = action;
520	rc = 0;
521	}
522	break;
523	case IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT:
524	if (action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
525	tgt->action = action;
526	rc = 0;
527	}
528	break;
529	case IBMVFC_TGT_ACTION_DEL_RPORT:
530	if (action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
531	tgt->action = action;
532	rc = 0;
533	}
534	break;
535	case IBMVFC_TGT_ACTION_DELETED_RPORT:
536	break;
537	default:
538	tgt->action = action;
539	rc = 0;
540	break;
541	}
542
543	if (action >= IBMVFC_TGT_ACTION_LOGOUT_RPORT)
544	tgt->add_rport = 0;
545
546	return rc;
547	}
548
549	/**
550	* ibmvfc_set_host_state - Set the state for the host
551	* @vhost: ibmvfc host struct
552	* @state: state to set host to
553	*
554	* Returns:
555	* 0 if state changed / non-zero if not changed
556	**/
557	static int ibmvfc_set_host_state(struct ibmvfc_host *vhost,
558	enum ibmvfc_host_state state)
559	{
560	int rc = 0;
561
562	switch (vhost->state) {
563	case IBMVFC_HOST_OFFLINE:
564	rc = -EINVAL;
565	break;
566	default:
567	vhost->state = state;
568	break;
569	}
570
571	return rc;
572	}
573
574	/**
575	* ibmvfc_set_host_action - Set the next init action for the host
576	* @vhost: ibmvfc host struct
577	* @action: action to perform
578	*
579	**/
580	static void ibmvfc_set_host_action(struct ibmvfc_host *vhost,
581	enum ibmvfc_host_action action)
582	{
583	switch (action) {
584	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
585	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT)
586	vhost->action = action;
587	break;
588	case IBMVFC_HOST_ACTION_LOGO_WAIT:
589	if (vhost->action == IBMVFC_HOST_ACTION_LOGO)
590	vhost->action = action;
591	break;
592	case IBMVFC_HOST_ACTION_INIT_WAIT:
593	if (vhost->action == IBMVFC_HOST_ACTION_INIT)
594	vhost->action = action;
595	break;
596	case IBMVFC_HOST_ACTION_QUERY:
597	switch (vhost->action) {
598	case IBMVFC_HOST_ACTION_INIT_WAIT:
599	case IBMVFC_HOST_ACTION_NONE:
600	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
601	vhost->action = action;
602	break;
603	default:
604	break;
605	}
606	break;
607	case IBMVFC_HOST_ACTION_TGT_INIT:
608	if (vhost->action == IBMVFC_HOST_ACTION_ALLOC_TGTS)
609	vhost->action = action;
610	break;
611	case IBMVFC_HOST_ACTION_REENABLE:
612	case IBMVFC_HOST_ACTION_RESET:
613	vhost->action = action;
614	break;
615	case IBMVFC_HOST_ACTION_INIT:
616	case IBMVFC_HOST_ACTION_TGT_DEL:
617	case IBMVFC_HOST_ACTION_LOGO:
618	case IBMVFC_HOST_ACTION_QUERY_TGTS:
619	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
620	case IBMVFC_HOST_ACTION_NONE:
621	default:
622	switch (vhost->action) {
623	case IBMVFC_HOST_ACTION_RESET:
624	case IBMVFC_HOST_ACTION_REENABLE:
625	break;
626	default:
627	vhost->action = action;
628	break;
629	}
630	break;
631	}
632	}
633
634	/**
635	* ibmvfc_reinit_host - Re-start host initialization (no NPIV Login)
636	* @vhost: ibmvfc host struct
637	*
638	* Return value:
639	* nothing
640	**/
641	static void ibmvfc_reinit_host(struct ibmvfc_host *vhost)
642	{
643	if (vhost->action == IBMVFC_HOST_ACTION_NONE &&
644	vhost->state == IBMVFC_ACTIVE) {
645	if (!ibmvfc_set_host_state(vhost, state: IBMVFC_INITIALIZING)) {
646	scsi_block_requests(vhost->host);
647	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_QUERY);
648	}
649	} else
650	vhost->reinit = 1;
651
652	wake_up(&vhost->work_wait_q);
653	}
654
655	/**
656	* ibmvfc_del_tgt - Schedule cleanup and removal of the target
657	* @tgt: ibmvfc target struct
658	**/
659	static void ibmvfc_del_tgt(struct ibmvfc_target *tgt)
660	{
661	if (!ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_LOGOUT_RPORT)) {
662	tgt->job_step = ibmvfc_tgt_implicit_logout_and_del;
663	tgt->init_retries = 0;
664	}
665	wake_up(&tgt->vhost->work_wait_q);
666	}
667
668	/**
669	* ibmvfc_link_down - Handle a link down event from the adapter
670	* @vhost: ibmvfc host struct
671	* @state: ibmvfc host state to enter
672	*
673	**/
674	static void ibmvfc_link_down(struct ibmvfc_host *vhost,
675	enum ibmvfc_host_state state)
676	{
677	struct ibmvfc_target *tgt;
678
679	ENTER;
680	scsi_block_requests(vhost->host);
681	list_for_each_entry(tgt, &vhost->targets, queue)
682	ibmvfc_del_tgt(tgt);
683	ibmvfc_set_host_state(vhost, state);
684	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_TGT_DEL);
685	vhost->events_to_log |= IBMVFC_AE_LINKDOWN;
686	wake_up(&vhost->work_wait_q);
687	LEAVE;
688	}
689
690	/**
691	* ibmvfc_init_host - Start host initialization
692	* @vhost: ibmvfc host struct
693	*
694	* Return value:
695	* nothing
696	**/
697	static void ibmvfc_init_host(struct ibmvfc_host *vhost)
698	{
699	struct ibmvfc_target *tgt;
700
701	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
702	if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
703	dev_err(vhost->dev,
704	"Host initialization retries exceeded. Taking adapter offline\n");
705	ibmvfc_link_down(vhost, state: IBMVFC_HOST_OFFLINE);
706	return;
707	}
708	}
709
710	if (!ibmvfc_set_host_state(vhost, state: IBMVFC_INITIALIZING)) {
711	memset(vhost->async_crq.msgs.async, 0, PAGE_SIZE);
712	vhost->async_crq.cur = 0;
713
714	list_for_each_entry(tgt, &vhost->targets, queue) {
715	if (vhost->client_migrated)
716	tgt->need_login = 1;
717	else
718	ibmvfc_del_tgt(tgt);
719	}
720
721	scsi_block_requests(vhost->host);
722	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT);
723	vhost->job_step = ibmvfc_npiv_login;
724	wake_up(&vhost->work_wait_q);
725	}
726	}
727
728	/**
729	* ibmvfc_send_crq - Send a CRQ
730	* @vhost: ibmvfc host struct
731	* @word1: the first 64 bits of the data
732	* @word2: the second 64 bits of the data
733	*
734	* Return value:
735	* 0 on success / other on failure
736	**/
737	static int ibmvfc_send_crq(struct ibmvfc_host *vhost, u64 word1, u64 word2)
738	{
739	struct vio_dev *vdev = to_vio_dev(vhost->dev);
740	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
741	}
742
743	static int ibmvfc_send_sub_crq(struct ibmvfc_host *vhost, u64 cookie, u64 word1,
744	u64 word2, u64 word3, u64 word4)
745	{
746	struct vio_dev *vdev = to_vio_dev(vhost->dev);
747
748	return plpar_hcall_norets(H_SEND_SUB_CRQ, vdev->unit_address, cookie,
749	word1, word2, word3, word4);
750	}
751
752	/**
753	* ibmvfc_send_crq_init - Send a CRQ init message
754	* @vhost: ibmvfc host struct
755	*
756	* Return value:
757	* 0 on success / other on failure
758	**/
759	static int ibmvfc_send_crq_init(struct ibmvfc_host *vhost)
760	{
761	ibmvfc_dbg(vhost, "Sending CRQ init\n");
762	return ibmvfc_send_crq(vhost, word1: 0xC001000000000000LL, word2: 0);
763	}
764
765	/**
766	* ibmvfc_send_crq_init_complete - Send a CRQ init complete message
767	* @vhost: ibmvfc host struct
768	*
769	* Return value:
770	* 0 on success / other on failure
771	**/
772	static int ibmvfc_send_crq_init_complete(struct ibmvfc_host *vhost)
773	{
774	ibmvfc_dbg(vhost, "Sending CRQ init complete\n");
775	return ibmvfc_send_crq(vhost, word1: 0xC002000000000000LL, word2: 0);
776	}
777
778	/**
779	* ibmvfc_init_event_pool - Allocates and initializes the event pool for a host
780	* @vhost: ibmvfc host who owns the event pool
781	* @queue: ibmvfc queue struct
782	*
783	* Returns zero on success.
784	**/
785	static int ibmvfc_init_event_pool(struct ibmvfc_host *vhost,
786	struct ibmvfc_queue *queue)
787	{
788	int i;
789	struct ibmvfc_event_pool *pool = &queue->evt_pool;
790
791	ENTER;
792	if (!queue->total_depth)
793	return 0;
794
795	pool->size = queue->total_depth;
796	pool->events = kcalloc(n: pool->size, size: sizeof(*pool->events), GFP_KERNEL);
797	if (!pool->events)
798	return -ENOMEM;
799
800	pool->iu_storage = dma_alloc_coherent(dev: vhost->dev,
801	size: pool->size * sizeof(*pool->iu_storage),
802	dma_handle: &pool->iu_token, gfp: 0);
803
804	if (!pool->iu_storage) {
805	kfree(objp: pool->events);
806	return -ENOMEM;
807	}
808
809	INIT_LIST_HEAD(list: &queue->sent);
810	INIT_LIST_HEAD(list: &queue->free);
811	queue->evt_free = queue->evt_depth;
812	queue->reserved_free = queue->reserved_depth;
813	spin_lock_init(&queue->l_lock);
814
815	for (i = 0; i < pool->size; ++i) {
816	struct ibmvfc_event *evt = &pool->events[i];
817
818	/*
819	* evt->active states
820	* 1 = in flight
821	* 0 = being completed
822	* -1 = free/freed
823	*/
824	atomic_set(v: &evt->active, i: -1);
825	atomic_set(v: &evt->free, i: 1);
826	evt->crq.valid = 0x80;
827	evt->crq.ioba = cpu_to_be64(pool->iu_token + (sizeof(*evt->xfer_iu) * i));
828	evt->xfer_iu = pool->iu_storage + i;
829	evt->vhost = vhost;
830	evt->queue = queue;
831	evt->ext_list = NULL;
832	list_add_tail(new: &evt->queue_list, head: &queue->free);
833	}
834
835	LEAVE;
836	return 0;
837	}
838
839	/**
840	* ibmvfc_free_event_pool - Frees memory of the event pool of a host
841	* @vhost: ibmvfc host who owns the event pool
842	* @queue: ibmvfc queue struct
843	*
844	**/
845	static void ibmvfc_free_event_pool(struct ibmvfc_host *vhost,
846	struct ibmvfc_queue *queue)
847	{
848	int i;
849	struct ibmvfc_event_pool *pool = &queue->evt_pool;
850
851	ENTER;
852	for (i = 0; i < pool->size; ++i) {
853	list_del(entry: &pool->events[i].queue_list);
854	BUG_ON(atomic_read(&pool->events[i].free) != 1);
855	if (pool->events[i].ext_list)
856	dma_pool_free(pool: vhost->sg_pool,
857	vaddr: pool->events[i].ext_list,
858	addr: pool->events[i].ext_list_token);
859	}
860
861	kfree(objp: pool->events);
862	dma_free_coherent(dev: vhost->dev,
863	size: pool->size * sizeof(*pool->iu_storage),
864	cpu_addr: pool->iu_storage, dma_handle: pool->iu_token);
865	LEAVE;
866	}
867
868	/**
869	* ibmvfc_free_queue - Deallocate queue
870	* @vhost: ibmvfc host struct
871	* @queue: ibmvfc queue struct
872	*
873	* Unmaps dma and deallocates page for messages
874	**/
875	static void ibmvfc_free_queue(struct ibmvfc_host *vhost,
876	struct ibmvfc_queue *queue)
877	{
878	struct device *dev = vhost->dev;
879
880	dma_unmap_single(dev, queue->msg_token, PAGE_SIZE, DMA_BIDIRECTIONAL);
881	free_page((unsigned long)queue->msgs.handle);
882	queue->msgs.handle = NULL;
883
884	ibmvfc_free_event_pool(vhost, queue);
885	}
886
887	/**
888	* ibmvfc_release_crq_queue - Deallocates data and unregisters CRQ
889	* @vhost: ibmvfc host struct
890	*
891	* Frees irq, deallocates a page for messages, unmaps dma, and unregisters
892	* the crq with the hypervisor.
893	**/
894	static void ibmvfc_release_crq_queue(struct ibmvfc_host *vhost)
895	{
896	long rc = 0;
897	struct vio_dev *vdev = to_vio_dev(vhost->dev);
898	struct ibmvfc_queue *crq = &vhost->crq;
899
900	ibmvfc_dbg(vhost, "Releasing CRQ\n");
901	free_irq(vdev->irq, vhost);
902	tasklet_kill(t: &vhost->tasklet);
903	do {
904	if (rc)
905	msleep(100);
906	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
907	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
908
909	vhost->state = IBMVFC_NO_CRQ;
910	vhost->logged_in = 0;
911
912	ibmvfc_free_queue(vhost, queue: crq);
913	}
914
915	/**
916	* ibmvfc_reenable_crq_queue - reenables the CRQ
917	* @vhost: ibmvfc host struct
918	*
919	* Return value:
920	* 0 on success / other on failure
921	**/
922	static int ibmvfc_reenable_crq_queue(struct ibmvfc_host *vhost)
923	{
924	int rc = 0;
925	struct vio_dev *vdev = to_vio_dev(vhost->dev);
926	unsigned long flags;
927
928	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
929
930	/* Re-enable the CRQ */
931	do {
932	if (rc)
933	msleep(100);
934	rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
935	} while (rc == H_IN_PROGRESS || rc == H_BUSY || H_IS_LONG_BUSY(rc));
936
937	if (rc)
938	dev_err(vhost->dev, "Error enabling adapter (rc=%d)\n", rc);
939
940	spin_lock_irqsave(vhost->host->host_lock, flags);
941	spin_lock(lock: vhost->crq.q_lock);
942	vhost->do_enquiry = 1;
943	vhost->using_channels = 0;
944	spin_unlock(lock: vhost->crq.q_lock);
945	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
946
947	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
948
949	return rc;
950	}
951
952	/**
953	* ibmvfc_reset_crq - resets a crq after a failure
954	* @vhost: ibmvfc host struct
955	*
956	* Return value:
957	* 0 on success / other on failure
958	**/
959	static int ibmvfc_reset_crq(struct ibmvfc_host *vhost)
960	{
961	int rc = 0;
962	unsigned long flags;
963	struct vio_dev *vdev = to_vio_dev(vhost->dev);
964	struct ibmvfc_queue *crq = &vhost->crq;
965
966	ibmvfc_dereg_sub_crqs(vhost, &vhost->scsi_scrqs);
967
968	/* Close the CRQ */
969	do {
970	if (rc)
971	msleep(100);
972	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
973	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
974
975	spin_lock_irqsave(vhost->host->host_lock, flags);
976	spin_lock(lock: vhost->crq.q_lock);
977	vhost->state = IBMVFC_NO_CRQ;
978	vhost->logged_in = 0;
979	vhost->do_enquiry = 1;
980	vhost->using_channels = 0;
981
982	/* Clean out the queue */
983	memset(crq->msgs.crq, 0, PAGE_SIZE);
984	crq->cur = 0;
985
986	/* And re-open it again */
987	rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
988	crq->msg_token, PAGE_SIZE);
989
990	if (rc == H_CLOSED)
991	/* Adapter is good, but other end is not ready */
992	dev_warn(vhost->dev, "Partner adapter not ready\n");
993	else if (rc != 0)
994	dev_warn(vhost->dev, "Couldn't register crq (rc=%d)\n", rc);
995
996	spin_unlock(lock: vhost->crq.q_lock);
997	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
998
999	ibmvfc_reg_sub_crqs(vhost, &vhost->scsi_scrqs);
1000
1001	return rc;
1002	}
1003
1004	/**
1005	* ibmvfc_valid_event - Determines if event is valid.
1006	* @pool: event_pool that contains the event
1007	* @evt: ibmvfc event to be checked for validity
1008	*
1009	* Return value:
1010	* 1 if event is valid / 0 if event is not valid
1011	**/
1012	static int ibmvfc_valid_event(struct ibmvfc_event_pool *pool,
1013	struct ibmvfc_event *evt)
1014	{
1015	int index = evt - pool->events;
1016	if (index < 0 || index >= pool->size) /* outside of bounds */
1017	return 0;
1018	if (evt != pool->events + index) /* unaligned */
1019	return 0;
1020	return 1;
1021	}
1022
1023	/**
1024	* ibmvfc_free_event - Free the specified event
1025	* @evt: ibmvfc_event to be freed
1026	*
1027	**/
1028	static void ibmvfc_free_event(struct ibmvfc_event *evt)
1029	{
1030	struct ibmvfc_event_pool *pool = &evt->queue->evt_pool;
1031	unsigned long flags;
1032
1033	BUG_ON(!ibmvfc_valid_event(pool, evt));
1034	BUG_ON(atomic_inc_return(&evt->free) != 1);
1035	BUG_ON(atomic_dec_and_test(&evt->active));
1036
1037	spin_lock_irqsave(&evt->queue->l_lock, flags);
1038	list_add_tail(new: &evt->queue_list, head: &evt->queue->free);
1039	if (evt->reserved) {
1040	evt->reserved = 0;
1041	evt->queue->reserved_free++;
1042	} else {
1043	evt->queue->evt_free++;
1044	}
1045	if (evt->eh_comp)
1046	complete(evt->eh_comp);
1047	spin_unlock_irqrestore(lock: &evt->queue->l_lock, flags);
1048	}
1049
1050	/**
1051	* ibmvfc_scsi_eh_done - EH done function for queuecommand commands
1052	* @evt: ibmvfc event struct
1053	*
1054	* This function does not setup any error status, that must be done
1055	* before this function gets called.
1056	**/
1057	static void ibmvfc_scsi_eh_done(struct ibmvfc_event *evt)
1058	{
1059	struct scsi_cmnd *cmnd = evt->cmnd;
1060
1061	if (cmnd) {
1062	scsi_dma_unmap(cmd: cmnd);
1063	scsi_done(cmd: cmnd);
1064	}
1065
1066	ibmvfc_free_event(evt);
1067	}
1068
1069	/**
1070	* ibmvfc_complete_purge - Complete failed command list
1071	* @purge_list: list head of failed commands
1072	*
1073	* This function runs completions on commands to fail as a result of a
1074	* host reset or platform migration.
1075	**/
1076	static void ibmvfc_complete_purge(struct list_head *purge_list)
1077	{
1078	struct ibmvfc_event *evt, *pos;
1079
1080	list_for_each_entry_safe(evt, pos, purge_list, queue_list) {
1081	list_del(entry: &evt->queue_list);
1082	ibmvfc_trc_end(evt);
1083	evt->done(evt);
1084	}
1085	}
1086
1087	/**
1088	* ibmvfc_fail_request - Fail request with specified error code
1089	* @evt: ibmvfc event struct
1090	* @error_code: error code to fail request with
1091	*
1092	* Return value:
1093	* none
1094	**/
1095	static void ibmvfc_fail_request(struct ibmvfc_event *evt, int error_code)
1096	{
1097	/*
1098	* Anything we are failing should still be active. Otherwise, it
1099	* implies we already got a response for the command and are doing
1100	* something bad like double completing it.
1101	*/
1102	BUG_ON(!atomic_dec_and_test(&evt->active));
1103	if (evt->cmnd) {
1104	evt->cmnd->result = (error_code << 16);
1105	evt->done = ibmvfc_scsi_eh_done;
1106	} else
1107	evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_DRIVER_FAILED);
1108
1109	del_timer(timer: &evt->timer);
1110	}
1111
1112	/**
1113	* ibmvfc_purge_requests - Our virtual adapter just shut down. Purge any sent requests
1114	* @vhost: ibmvfc host struct
1115	* @error_code: error code to fail requests with
1116	*
1117	* Return value:
1118	* none
1119	**/
1120	static void ibmvfc_purge_requests(struct ibmvfc_host *vhost, int error_code)
1121	{
1122	struct ibmvfc_event *evt, *pos;
1123	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
1124	unsigned long flags;
1125	int hwqs = 0;
1126	int i;
1127
1128	if (vhost->using_channels)
1129	hwqs = vhost->scsi_scrqs.active_queues;
1130
1131	ibmvfc_dbg(vhost, "Purging all requests\n");
1132	spin_lock_irqsave(&vhost->crq.l_lock, flags);
1133	list_for_each_entry_safe(evt, pos, &vhost->crq.sent, queue_list)
1134	ibmvfc_fail_request(evt, error_code);
1135	list_splice_init(list: &vhost->crq.sent, head: &vhost->purge);
1136	spin_unlock_irqrestore(lock: &vhost->crq.l_lock, flags);
1137
1138	for (i = 0; i < hwqs; i++) {
1139	spin_lock_irqsave(queues[i].q_lock, flags);
1140	spin_lock(lock: &queues[i].l_lock);
1141	list_for_each_entry_safe(evt, pos, &queues[i].sent, queue_list)
1142	ibmvfc_fail_request(evt, error_code);
1143	list_splice_init(list: &queues[i].sent, head: &vhost->purge);
1144	spin_unlock(lock: &queues[i].l_lock);
1145	spin_unlock_irqrestore(lock: queues[i].q_lock, flags);
1146	}
1147	}
1148
1149	/**
1150	* ibmvfc_hard_reset_host - Reset the connection to the server by breaking the CRQ
1151	* @vhost: struct ibmvfc host to reset
1152	**/
1153	static void ibmvfc_hard_reset_host(struct ibmvfc_host *vhost)
1154	{
1155	ibmvfc_purge_requests(vhost, error_code: DID_ERROR);
1156	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DOWN);
1157	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_RESET);
1158	}
1159
1160	/**
1161	* __ibmvfc_reset_host - Reset the connection to the server (no locking)
1162	* @vhost: struct ibmvfc host to reset
1163	**/
1164	static void __ibmvfc_reset_host(struct ibmvfc_host *vhost)
1165	{
1166	if (vhost->logged_in && vhost->action != IBMVFC_HOST_ACTION_LOGO_WAIT &&
1167	!ibmvfc_set_host_state(vhost, state: IBMVFC_INITIALIZING)) {
1168	scsi_block_requests(vhost->host);
1169	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_LOGO);
1170	vhost->job_step = ibmvfc_npiv_logout;
1171	wake_up(&vhost->work_wait_q);
1172	} else
1173	ibmvfc_hard_reset_host(vhost);
1174	}
1175
1176	/**
1177	* ibmvfc_reset_host - Reset the connection to the server
1178	* @vhost: ibmvfc host struct
1179	**/
1180	static void ibmvfc_reset_host(struct ibmvfc_host *vhost)
1181	{
1182	unsigned long flags;
1183
1184	spin_lock_irqsave(vhost->host->host_lock, flags);
1185	__ibmvfc_reset_host(vhost);
1186	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
1187	}
1188
1189	/**
1190	* ibmvfc_retry_host_init - Retry host initialization if allowed
1191	* @vhost: ibmvfc host struct
1192	*
1193	* Returns: 1 if init will be retried / 0 if not
1194	*
1195	**/
1196	static int ibmvfc_retry_host_init(struct ibmvfc_host *vhost)
1197	{
1198	int retry = 0;
1199
1200	if (vhost->action == IBMVFC_HOST_ACTION_INIT_WAIT) {
1201	vhost->delay_init = 1;
1202	if (++vhost->init_retries > IBMVFC_MAX_HOST_INIT_RETRIES) {
1203	dev_err(vhost->dev,
1204	"Host initialization retries exceeded. Taking adapter offline\n");
1205	ibmvfc_link_down(vhost, state: IBMVFC_HOST_OFFLINE);
1206	} else if (vhost->init_retries == IBMVFC_MAX_HOST_INIT_RETRIES)
1207	__ibmvfc_reset_host(vhost);
1208	else {
1209	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT);
1210	retry = 1;
1211	}
1212	}
1213
1214	wake_up(&vhost->work_wait_q);
1215	return retry;
1216	}
1217
1218	/**
1219	* __ibmvfc_get_target - Find the specified scsi_target (no locking)
1220	* @starget: scsi target struct
1221	*
1222	* Return value:
1223	* ibmvfc_target struct / NULL if not found
1224	**/
1225	static struct ibmvfc_target *__ibmvfc_get_target(struct scsi_target *starget)
1226	{
1227	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
1228	struct ibmvfc_host *vhost = shost_priv(shost);
1229	struct ibmvfc_target *tgt;
1230
1231	list_for_each_entry(tgt, &vhost->targets, queue)
1232	if (tgt->target_id == starget->id) {
1233	kref_get(kref: &tgt->kref);
1234	return tgt;
1235	}
1236	return NULL;
1237	}
1238
1239	/**
1240	* ibmvfc_get_target - Find the specified scsi_target
1241	* @starget: scsi target struct
1242	*
1243	* Return value:
1244	* ibmvfc_target struct / NULL if not found
1245	**/
1246	static struct ibmvfc_target *ibmvfc_get_target(struct scsi_target *starget)
1247	{
1248	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
1249	struct ibmvfc_target *tgt;
1250	unsigned long flags;
1251
1252	spin_lock_irqsave(shost->host_lock, flags);
1253	tgt = __ibmvfc_get_target(starget);
1254	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1255	return tgt;
1256	}
1257
1258	/**
1259	* ibmvfc_get_host_speed - Get host port speed
1260	* @shost: scsi host struct
1261	*
1262	* Return value:
1263	* none
1264	**/
1265	static void ibmvfc_get_host_speed(struct Scsi_Host *shost)
1266	{
1267	struct ibmvfc_host *vhost = shost_priv(shost);
1268	unsigned long flags;
1269
1270	spin_lock_irqsave(shost->host_lock, flags);
1271	if (vhost->state == IBMVFC_ACTIVE) {
1272	switch (be64_to_cpu(vhost->login_buf->resp.link_speed) / 100) {
1273	case 1:
1274	fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
1275	break;
1276	case 2:
1277	fc_host_speed(shost) = FC_PORTSPEED_2GBIT;
1278	break;
1279	case 4:
1280	fc_host_speed(shost) = FC_PORTSPEED_4GBIT;
1281	break;
1282	case 8:
1283	fc_host_speed(shost) = FC_PORTSPEED_8GBIT;
1284	break;
1285	case 10:
1286	fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
1287	break;
1288	case 16:
1289	fc_host_speed(shost) = FC_PORTSPEED_16GBIT;
1290	break;
1291	default:
1292	ibmvfc_log(vhost, 3, "Unknown port speed: %lld Gbit\n",
1293	be64_to_cpu(vhost->login_buf->resp.link_speed) / 100);
1294	fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1295	break;
1296	}
1297	} else
1298	fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
1299	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1300	}
1301
1302	/**
1303	* ibmvfc_get_host_port_state - Get host port state
1304	* @shost: scsi host struct
1305	*
1306	* Return value:
1307	* none
1308	**/
1309	static void ibmvfc_get_host_port_state(struct Scsi_Host *shost)
1310	{
1311	struct ibmvfc_host *vhost = shost_priv(shost);
1312	unsigned long flags;
1313
1314	spin_lock_irqsave(shost->host_lock, flags);
1315	switch (vhost->state) {
1316	case IBMVFC_INITIALIZING:
1317	case IBMVFC_ACTIVE:
1318	fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
1319	break;
1320	case IBMVFC_LINK_DOWN:
1321	fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
1322	break;
1323	case IBMVFC_LINK_DEAD:
1324	case IBMVFC_HOST_OFFLINE:
1325	fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
1326	break;
1327	case IBMVFC_HALTED:
1328	fc_host_port_state(shost) = FC_PORTSTATE_BLOCKED;
1329	break;
1330	case IBMVFC_NO_CRQ:
1331	fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1332	break;
1333	default:
1334	ibmvfc_log(vhost, 3, "Unknown port state: %d\n", vhost->state);
1335	fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;
1336	break;
1337	}
1338	spin_unlock_irqrestore(lock: shost->host_lock, flags);
1339	}
1340
1341	/**
1342	* ibmvfc_set_rport_dev_loss_tmo - Set rport's device loss timeout
1343	* @rport: rport struct
1344	* @timeout: timeout value
1345	*
1346	* Return value:
1347	* none
1348	**/
1349	static void ibmvfc_set_rport_dev_loss_tmo(struct fc_rport *rport, u32 timeout)
1350	{
1351	if (timeout)
1352	rport->dev_loss_tmo = timeout;
1353	else
1354	rport->dev_loss_tmo = 1;
1355	}
1356
1357	/**
1358	* ibmvfc_release_tgt - Free memory allocated for a target
1359	* @kref: kref struct
1360	*
1361	**/
1362	static void ibmvfc_release_tgt(struct kref *kref)
1363	{
1364	struct ibmvfc_target *tgt = container_of(kref, struct ibmvfc_target, kref);
1365	kfree(objp: tgt);
1366	}
1367
1368	/**
1369	* ibmvfc_get_starget_node_name - Get SCSI target's node name
1370	* @starget: scsi target struct
1371	*
1372	* Return value:
1373	* none
1374	**/
1375	static void ibmvfc_get_starget_node_name(struct scsi_target *starget)
1376	{
1377	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1378	fc_starget_port_name(starget) = tgt ? tgt->ids.node_name : 0;
1379	if (tgt)
1380	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
1381	}
1382
1383	/**
1384	* ibmvfc_get_starget_port_name - Get SCSI target's port name
1385	* @starget: scsi target struct
1386	*
1387	* Return value:
1388	* none
1389	**/
1390	static void ibmvfc_get_starget_port_name(struct scsi_target *starget)
1391	{
1392	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1393	fc_starget_port_name(starget) = tgt ? tgt->ids.port_name : 0;
1394	if (tgt)
1395	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
1396	}
1397
1398	/**
1399	* ibmvfc_get_starget_port_id - Get SCSI target's port ID
1400	* @starget: scsi target struct
1401	*
1402	* Return value:
1403	* none
1404	**/
1405	static void ibmvfc_get_starget_port_id(struct scsi_target *starget)
1406	{
1407	struct ibmvfc_target *tgt = ibmvfc_get_target(starget);
1408	fc_starget_port_id(starget) = tgt ? tgt->scsi_id : -1;
1409	if (tgt)
1410	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
1411	}
1412
1413	/**
1414	* ibmvfc_wait_while_resetting - Wait while the host resets
1415	* @vhost: ibmvfc host struct
1416	*
1417	* Return value:
1418	* 0 on success / other on failure
1419	**/
1420	static int ibmvfc_wait_while_resetting(struct ibmvfc_host *vhost)
1421	{
1422	long timeout = wait_event_timeout(vhost->init_wait_q,
1423	((vhost->state == IBMVFC_ACTIVE ||
1424	vhost->state == IBMVFC_HOST_OFFLINE ||
1425	vhost->state == IBMVFC_LINK_DEAD) &&
1426	vhost->action == IBMVFC_HOST_ACTION_NONE),
1427	(init_timeout * HZ));
1428
1429	return timeout ? 0 : -EIO;
1430	}
1431
1432	/**
1433	* ibmvfc_issue_fc_host_lip - Re-initiate link initialization
1434	* @shost: scsi host struct
1435	*
1436	* Return value:
1437	* 0 on success / other on failure
1438	**/
1439	static int ibmvfc_issue_fc_host_lip(struct Scsi_Host *shost)
1440	{
1441	struct ibmvfc_host *vhost = shost_priv(shost);
1442
1443	dev_err(vhost->dev, "Initiating host LIP. Resetting connection\n");
1444	ibmvfc_reset_host(vhost);
1445	return ibmvfc_wait_while_resetting(vhost);
1446	}
1447
1448	/**
1449	* ibmvfc_gather_partition_info - Gather info about the LPAR
1450	* @vhost: ibmvfc host struct
1451	*
1452	* Return value:
1453	* none
1454	**/
1455	static void ibmvfc_gather_partition_info(struct ibmvfc_host *vhost)
1456	{
1457	struct device_node *rootdn;
1458	const char *name;
1459	const unsigned int *num;
1460
1461	rootdn = of_find_node_by_path(path: "/");
1462	if (!rootdn)
1463	return;
1464
1465	name = of_get_property(node: rootdn, name: "ibm,partition-name", NULL);
1466	if (name)
1467	strncpy(p: vhost->partition_name, q: name, size: sizeof(vhost->partition_name));
1468	num = of_get_property(node: rootdn, name: "ibm,partition-no", NULL);
1469	if (num)
1470	vhost->partition_number = *num;
1471	of_node_put(node: rootdn);
1472	}
1473
1474	/**
1475	* ibmvfc_set_login_info - Setup info for NPIV login
1476	* @vhost: ibmvfc host struct
1477	*
1478	* Return value:
1479	* none
1480	**/
1481	static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
1482	{
1483	struct ibmvfc_npiv_login *login_info = &vhost->login_info;
1484	struct ibmvfc_queue *async_crq = &vhost->async_crq;
1485	struct device_node *of_node = vhost->dev->of_node;
1486	const char *location;
1487	u16 max_cmds;
1488
1489	max_cmds = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
1490	if (mq_enabled)
1491	max_cmds += (scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ) *
1492	vhost->scsi_scrqs.desired_queues;
1493
1494	memset(login_info, 0, sizeof(*login_info));
1495
1496	login_info->ostype = cpu_to_be32(IBMVFC_OS_LINUX);
1497	login_info->max_dma_len = cpu_to_be64(IBMVFC_MAX_SECTORS << 9);
1498	login_info->max_payload = cpu_to_be32(sizeof(struct ibmvfc_fcp_cmd_iu));
1499	login_info->max_response = cpu_to_be32(sizeof(struct ibmvfc_fcp_rsp));
1500	login_info->partition_num = cpu_to_be32(vhost->partition_number);
1501	login_info->vfc_frame_version = cpu_to_be32(1);
1502	login_info->fcp_version = cpu_to_be16(3);
1503	login_info->flags = cpu_to_be16(IBMVFC_FLUSH_ON_HALT);
1504	if (vhost->client_migrated)
1505	login_info->flags |= cpu_to_be16(IBMVFC_CLIENT_MIGRATED);
1506
1507	login_info->max_cmds = cpu_to_be32(max_cmds);
1508	login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
1509
1510	if (vhost->mq_enabled || vhost->using_channels)
1511	login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
1512
1513	login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
1514	login_info->async.len = cpu_to_be32(async_crq->size *
1515	sizeof(*async_crq->msgs.async));
1516	strncpy(p: login_info->partition_name, q: vhost->partition_name, IBMVFC_MAX_NAME);
1517	strncpy(p: login_info->device_name,
1518	q: dev_name(dev: &vhost->host->shost_gendev), IBMVFC_MAX_NAME);
1519
1520	location = of_get_property(node: of_node, name: "ibm,loc-code", NULL);
1521	location = location ? location : dev_name(dev: vhost->dev);
1522	strncpy(p: login_info->drc_name, q: location, IBMVFC_MAX_NAME);
1523	}
1524
1525	/**
1526	* __ibmvfc_get_event - Gets the next free event in pool
1527	* @queue: ibmvfc queue struct
1528	* @reserved: event is for a reserved management command
1529	*
1530	* Returns a free event from the pool.
1531	**/
1532	static struct ibmvfc_event *__ibmvfc_get_event(struct ibmvfc_queue *queue, int reserved)
1533	{
1534	struct ibmvfc_event *evt = NULL;
1535	unsigned long flags;
1536
1537	spin_lock_irqsave(&queue->l_lock, flags);
1538	if (reserved && queue->reserved_free) {
1539	evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1540	evt->reserved = 1;
1541	queue->reserved_free--;
1542	} else if (queue->evt_free) {
1543	evt = list_entry(queue->free.next, struct ibmvfc_event, queue_list);
1544	queue->evt_free--;
1545	} else {
1546	goto out;
1547	}
1548
1549	atomic_set(v: &evt->free, i: 0);
1550	list_del(entry: &evt->queue_list);
1551	out:
1552	spin_unlock_irqrestore(lock: &queue->l_lock, flags);
1553	return evt;
1554	}
1555
1556	#define ibmvfc_get_event(queue) __ibmvfc_get_event(queue, 0)
1557	#define ibmvfc_get_reserved_event(queue) __ibmvfc_get_event(queue, 1)
1558
1559	/**
1560	* ibmvfc_locked_done - Calls evt completion with host_lock held
1561	* @evt: ibmvfc evt to complete
1562	*
1563	* All non-scsi command completion callbacks have the expectation that the
1564	* host_lock is held. This callback is used by ibmvfc_init_event to wrap a
1565	* MAD evt with the host_lock.
1566	**/
1567	static void ibmvfc_locked_done(struct ibmvfc_event *evt)
1568	{
1569	unsigned long flags;
1570
1571	spin_lock_irqsave(evt->vhost->host->host_lock, flags);
1572	evt->_done(evt);
1573	spin_unlock_irqrestore(lock: evt->vhost->host->host_lock, flags);
1574	}
1575
1576	/**
1577	* ibmvfc_init_event - Initialize fields in an event struct that are always
1578	* required.
1579	* @evt: The event
1580	* @done: Routine to call when the event is responded to
1581	* @format: SRP or MAD format
1582	**/
1583	static void ibmvfc_init_event(struct ibmvfc_event *evt,
1584	void (*done) (struct ibmvfc_event *), u8 format)
1585	{
1586	evt->cmnd = NULL;
1587	evt->sync_iu = NULL;
1588	evt->eh_comp = NULL;
1589	evt->crq.format = format;
1590	if (format == IBMVFC_CMD_FORMAT)
1591	evt->done = done;
1592	else {
1593	evt->_done = done;
1594	evt->done = ibmvfc_locked_done;
1595	}
1596	evt->hwq = 0;
1597	}
1598
1599	/**
1600	* ibmvfc_map_sg_list - Initialize scatterlist
1601	* @scmd: scsi command struct
1602	* @nseg: number of scatterlist segments
1603	* @md: memory descriptor list to initialize
1604	**/
1605	static void ibmvfc_map_sg_list(struct scsi_cmnd *scmd, int nseg,
1606	struct srp_direct_buf *md)
1607	{
1608	int i;
1609	struct scatterlist *sg;
1610
1611	scsi_for_each_sg(scmd, sg, nseg, i) {
1612	md[i].va = cpu_to_be64(sg_dma_address(sg));
1613	md[i].len = cpu_to_be32(sg_dma_len(sg));
1614	md[i].key = 0;
1615	}
1616	}
1617
1618	/**
1619	* ibmvfc_map_sg_data - Maps dma for a scatterlist and initializes descriptor fields
1620	* @scmd: struct scsi_cmnd with the scatterlist
1621	* @evt: ibmvfc event struct
1622	* @vfc_cmd: vfc_cmd that contains the memory descriptor
1623	* @dev: device for which to map dma memory
1624	*
1625	* Returns:
1626	* 0 on success / non-zero on failure
1627	**/
1628	static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
1629	struct ibmvfc_event *evt,
1630	struct ibmvfc_cmd *vfc_cmd, struct device *dev)
1631	{
1632
1633	int sg_mapped;
1634	struct srp_direct_buf *data = &vfc_cmd->ioba;
1635	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
1636	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost: evt->vhost, vfc_cmd);
1637
1638	if (cls3_error)
1639	vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
1640
1641	sg_mapped = scsi_dma_map(cmd: scmd);
1642	if (!sg_mapped) {
1643	vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
1644	return 0;
1645	} else if (unlikely(sg_mapped < 0)) {
1646	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1647	scmd_printk(KERN_ERR, scmd, "Failed to map DMA buffer for command\n");
1648	return sg_mapped;
1649	}
1650
1651	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
1652	vfc_cmd->flags |= cpu_to_be16(IBMVFC_WRITE);
1653	iu->add_cdb_len |= IBMVFC_WRDATA;
1654	} else {
1655	vfc_cmd->flags |= cpu_to_be16(IBMVFC_READ);
1656	iu->add_cdb_len |= IBMVFC_RDDATA;
1657	}
1658
1659	if (sg_mapped == 1) {
1660	ibmvfc_map_sg_list(scmd, nseg: sg_mapped, md: data);
1661	return 0;
1662	}
1663
1664	vfc_cmd->flags |= cpu_to_be16(IBMVFC_SCATTERLIST);
1665
1666	if (!evt->ext_list) {
1667	evt->ext_list = dma_pool_alloc(pool: vhost->sg_pool, GFP_ATOMIC,
1668	handle: &evt->ext_list_token);
1669
1670	if (!evt->ext_list) {
1671	scsi_dma_unmap(cmd: scmd);
1672	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
1673	scmd_printk(KERN_ERR, scmd, "Can't allocate memory for scatterlist\n");
1674	return -ENOMEM;
1675	}
1676	}
1677
1678	ibmvfc_map_sg_list(scmd, nseg: sg_mapped, md: evt->ext_list);
1679
1680	data->va = cpu_to_be64(evt->ext_list_token);
1681	data->len = cpu_to_be32(sg_mapped * sizeof(struct srp_direct_buf));
1682	data->key = 0;
1683	return 0;
1684	}
1685
1686	/**
1687	* ibmvfc_timeout - Internal command timeout handler
1688	* @t: struct ibmvfc_event that timed out
1689	*
1690	* Called when an internally generated command times out
1691	**/
1692	static void ibmvfc_timeout(struct timer_list *t)
1693	{
1694	struct ibmvfc_event *evt = from_timer(evt, t, timer);
1695	struct ibmvfc_host *vhost = evt->vhost;
1696	dev_err(vhost->dev, "Command timed out (%p). Resetting connection\n", evt);
1697	ibmvfc_reset_host(vhost);
1698	}
1699
1700	/**
1701	* ibmvfc_send_event - Transforms event to u64 array and calls send_crq()
1702	* @evt: event to be sent
1703	* @vhost: ibmvfc host struct
1704	* @timeout: timeout in seconds - 0 means do not time command
1705	*
1706	* Returns the value returned from ibmvfc_send_crq(). (Zero for success)
1707	**/
1708	static int ibmvfc_send_event(struct ibmvfc_event *evt,
1709	struct ibmvfc_host *vhost, unsigned long timeout)
1710	{
1711	__be64 *crq_as_u64 = (__be64 *) &evt->crq;
1712	unsigned long flags;
1713	int rc;
1714
1715	/* Copy the IU into the transfer area */
1716	*evt->xfer_iu = evt->iu;
1717	if (evt->crq.format == IBMVFC_CMD_FORMAT)
1718	evt->xfer_iu->cmd.tag = cpu_to_be64((u64)evt);
1719	else if (evt->crq.format == IBMVFC_MAD_FORMAT)
1720	evt->xfer_iu->mad_common.tag = cpu_to_be64((u64)evt);
1721	else
1722	BUG();
1723
1724	timer_setup(&evt->timer, ibmvfc_timeout, 0);
1725
1726	if (timeout) {
1727	evt->timer.expires = jiffies + (timeout * HZ);
1728	add_timer(timer: &evt->timer);
1729	}
1730
1731	spin_lock_irqsave(&evt->queue->l_lock, flags);
1732	list_add_tail(new: &evt->queue_list, head: &evt->queue->sent);
1733	atomic_set(v: &evt->active, i: 1);
1734
1735	mb();
1736
1737	if (evt->queue->fmt == IBMVFC_SUB_CRQ_FMT)
1738	rc = ibmvfc_send_sub_crq(vhost,
1739	cookie: evt->queue->vios_cookie,
1740	be64_to_cpu(crq_as_u64[0]),
1741	be64_to_cpu(crq_as_u64[1]),
1742	word3: 0, word4: 0);
1743	else
1744	rc = ibmvfc_send_crq(vhost, be64_to_cpu(crq_as_u64[0]),
1745	be64_to_cpu(crq_as_u64[1]));
1746
1747	if (rc) {
1748	atomic_set(v: &evt->active, i: 0);
1749	list_del(entry: &evt->queue_list);
1750	spin_unlock_irqrestore(lock: &evt->queue->l_lock, flags);
1751	del_timer(timer: &evt->timer);
1752
1753	/* If send_crq returns H_CLOSED, return SCSI_MLQUEUE_HOST_BUSY.
1754	* Firmware will send a CRQ with a transport event (0xFF) to
1755	* tell this client what has happened to the transport. This
1756	* will be handled in ibmvfc_handle_crq()
1757	*/
1758	if (rc == H_CLOSED) {
1759	if (printk_ratelimit())
1760	dev_warn(vhost->dev, "Send warning. Receive queue closed, will retry.\n");
1761	if (evt->cmnd)
1762	scsi_dma_unmap(cmd: evt->cmnd);
1763	ibmvfc_free_event(evt);
1764	return SCSI_MLQUEUE_HOST_BUSY;
1765	}
1766
1767	dev_err(vhost->dev, "Send error (rc=%d)\n", rc);
1768	if (evt->cmnd) {
1769	evt->cmnd->result = DID_ERROR << 16;
1770	evt->done = ibmvfc_scsi_eh_done;
1771	} else
1772	evt->xfer_iu->mad_common.status = cpu_to_be16(IBMVFC_MAD_CRQ_ERROR);
1773
1774	evt->done(evt);
1775	} else {
1776	spin_unlock_irqrestore(lock: &evt->queue->l_lock, flags);
1777	ibmvfc_trc_start(evt);
1778	}
1779
1780	return 0;
1781	}
1782
1783	/**
1784	* ibmvfc_log_error - Log an error for the failed command if appropriate
1785	* @evt: ibmvfc event to log
1786	*
1787	**/
1788	static void ibmvfc_log_error(struct ibmvfc_event *evt)
1789	{
1790	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1791	struct ibmvfc_host *vhost = evt->vhost;
1792	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1793	struct scsi_cmnd *cmnd = evt->cmnd;
1794	const char *err = unknown_error;
1795	int index = ibmvfc_get_err_index(be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error));
1796	int logerr = 0;
1797	int rsp_code = 0;
1798
1799	if (index >= 0) {
1800	logerr = cmd_status[index].log;
1801	err = cmd_status[index].name;
1802	}
1803
1804	if (!logerr && (vhost->log_level <= (IBMVFC_DEFAULT_LOG_LEVEL + 1)))
1805	return;
1806
1807	if (rsp->flags & FCP_RSP_LEN_VALID)
1808	rsp_code = rsp->data.info.rsp_code;
1809
1810	scmd_printk(KERN_ERR, cmnd, "Command (%02X) : %s (%x:%x) "
1811	"flags: %x fcp_rsp: %x, resid=%d, scsi_status: %x\n",
1812	cmnd->cmnd[0], err, be16_to_cpu(vfc_cmd->status), be16_to_cpu(vfc_cmd->error),
1813	rsp->flags, rsp_code, scsi_get_resid(cmd: cmnd), rsp->scsi_status);
1814	}
1815
1816	/**
1817	* ibmvfc_relogin - Log back into the specified device
1818	* @sdev: scsi device struct
1819	*
1820	**/
1821	static void ibmvfc_relogin(struct scsi_device *sdev)
1822	{
1823	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
1824	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1825	struct ibmvfc_target *tgt;
1826	unsigned long flags;
1827
1828	spin_lock_irqsave(vhost->host->host_lock, flags);
1829	list_for_each_entry(tgt, &vhost->targets, queue) {
1830	if (rport == tgt->rport) {
1831	ibmvfc_del_tgt(tgt);
1832	break;
1833	}
1834	}
1835
1836	ibmvfc_reinit_host(vhost);
1837	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
1838	}
1839
1840	/**
1841	* ibmvfc_scsi_done - Handle responses from commands
1842	* @evt: ibmvfc event to be handled
1843	*
1844	* Used as a callback when sending scsi cmds.
1845	**/
1846	static void ibmvfc_scsi_done(struct ibmvfc_event *evt)
1847	{
1848	struct ibmvfc_cmd *vfc_cmd = &evt->xfer_iu->cmd;
1849	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost: evt->vhost, vfc_cmd);
1850	struct scsi_cmnd *cmnd = evt->cmnd;
1851	u32 rsp_len = 0;
1852	u32 sense_len = be32_to_cpu(rsp->fcp_sense_len);
1853
1854	if (cmnd) {
1855	if (be16_to_cpu(vfc_cmd->response_flags) & IBMVFC_ADAPTER_RESID_VALID)
1856	scsi_set_resid(cmd: cmnd, be32_to_cpu(vfc_cmd->adapter_resid));
1857	else if (rsp->flags & FCP_RESID_UNDER)
1858	scsi_set_resid(cmd: cmnd, be32_to_cpu(rsp->fcp_resid));
1859	else
1860	scsi_set_resid(cmd: cmnd, resid: 0);
1861
1862	if (vfc_cmd->status) {
1863	cmnd->result = ibmvfc_get_err_result(vhost: evt->vhost, vfc_cmd);
1864
1865	if (rsp->flags & FCP_RSP_LEN_VALID)
1866	rsp_len = be32_to_cpu(rsp->fcp_rsp_len);
1867	if ((sense_len + rsp_len) > SCSI_SENSE_BUFFERSIZE)
1868	sense_len = SCSI_SENSE_BUFFERSIZE - rsp_len;
1869	if ((rsp->flags & FCP_SNS_LEN_VALID) && rsp->fcp_sense_len && rsp_len <= 8)
1870	memcpy(cmnd->sense_buffer, rsp->data.sense + rsp_len, sense_len);
1871	if ((be16_to_cpu(vfc_cmd->status) & IBMVFC_VIOS_FAILURE) &&
1872	(be16_to_cpu(vfc_cmd->error) == IBMVFC_PLOGI_REQUIRED))
1873	ibmvfc_relogin(sdev: cmnd->device);
1874
1875	if (!cmnd->result && (!scsi_get_resid(cmd: cmnd) || (rsp->flags & FCP_RESID_OVER)))
1876	cmnd->result = (DID_ERROR << 16);
1877
1878	ibmvfc_log_error(evt);
1879	}
1880
1881	if (!cmnd->result &&
1882	(scsi_bufflen(cmd: cmnd) - scsi_get_resid(cmd: cmnd) < cmnd->underflow))
1883	cmnd->result = (DID_ERROR << 16);
1884
1885	scsi_dma_unmap(cmd: cmnd);
1886	scsi_done(cmd: cmnd);
1887	}
1888
1889	ibmvfc_free_event(evt);
1890	}
1891
1892	/**
1893	* ibmvfc_host_chkready - Check if the host can accept commands
1894	* @vhost: struct ibmvfc host
1895	*
1896	* Returns:
1897	* 1 if host can accept command / 0 if not
1898	**/
1899	static inline int ibmvfc_host_chkready(struct ibmvfc_host *vhost)
1900	{
1901	int result = 0;
1902
1903	switch (vhost->state) {
1904	case IBMVFC_LINK_DEAD:
1905	case IBMVFC_HOST_OFFLINE:
1906	result = DID_NO_CONNECT << 16;
1907	break;
1908	case IBMVFC_NO_CRQ:
1909	case IBMVFC_INITIALIZING:
1910	case IBMVFC_HALTED:
1911	case IBMVFC_LINK_DOWN:
1912	result = DID_REQUEUE << 16;
1913	break;
1914	case IBMVFC_ACTIVE:
1915	result = 0;
1916	break;
1917	}
1918
1919	return result;
1920	}
1921
1922	static struct ibmvfc_cmd *ibmvfc_init_vfc_cmd(struct ibmvfc_event *evt, struct scsi_device *sdev)
1923	{
1924	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
1925	struct ibmvfc_host *vhost = evt->vhost;
1926	struct ibmvfc_cmd *vfc_cmd = &evt->iu.cmd;
1927	struct ibmvfc_fcp_cmd_iu *iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1928	struct ibmvfc_fcp_rsp *rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd);
1929	size_t offset;
1930
1931	memset(vfc_cmd, 0, sizeof(*vfc_cmd));
1932	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
1933	offset = offsetof(struct ibmvfc_cmd, v2.rsp);
1934	vfc_cmd->target_wwpn = cpu_to_be64(rport->port_name);
1935	} else
1936	offset = offsetof(struct ibmvfc_cmd, v1.rsp);
1937	vfc_cmd->resp.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) + offset);
1938	vfc_cmd->resp.len = cpu_to_be32(sizeof(*rsp));
1939	vfc_cmd->frame_type = cpu_to_be32(IBMVFC_SCSI_FCP_TYPE);
1940	vfc_cmd->payload_len = cpu_to_be32(sizeof(*iu));
1941	vfc_cmd->resp_len = cpu_to_be32(sizeof(*rsp));
1942	vfc_cmd->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
1943	vfc_cmd->tgt_scsi_id = cpu_to_be64(rport->port_id);
1944	int_to_scsilun(sdev->lun, &iu->lun);
1945
1946	return vfc_cmd;
1947	}
1948
1949	/**
1950	* ibmvfc_queuecommand - The queuecommand function of the scsi template
1951	* @shost: scsi host struct
1952	* @cmnd: struct scsi_cmnd to be executed
1953	*
1954	* Returns:
1955	* 0 on success / other on failure
1956	**/
1957	static int ibmvfc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *cmnd)
1958	{
1959	struct ibmvfc_host *vhost = shost_priv(shost);
1960	struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
1961	struct ibmvfc_cmd *vfc_cmd;
1962	struct ibmvfc_fcp_cmd_iu *iu;
1963	struct ibmvfc_event *evt;
1964	u32 tag_and_hwq = blk_mq_unique_tag(rq: scsi_cmd_to_rq(scmd: cmnd));
1965	u16 hwq = blk_mq_unique_tag_to_hwq(unique_tag: tag_and_hwq);
1966	u16 scsi_channel;
1967	int rc;
1968
1969	if (unlikely((rc = fc_remote_port_chkready(rport))) ||
1970	unlikely((rc = ibmvfc_host_chkready(vhost)))) {
1971	cmnd->result = rc;
1972	scsi_done(cmd: cmnd);
1973	return 0;
1974	}
1975
1976	cmnd->result = (DID_OK << 16);
1977	if (vhost->using_channels) {
1978	scsi_channel = hwq % vhost->scsi_scrqs.active_queues;
1979	evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[scsi_channel]);
1980	if (!evt)
1981	return SCSI_MLQUEUE_HOST_BUSY;
1982
1983	evt->hwq = hwq % vhost->scsi_scrqs.active_queues;
1984	} else {
1985	evt = ibmvfc_get_event(&vhost->crq);
1986	if (!evt)
1987	return SCSI_MLQUEUE_HOST_BUSY;
1988	}
1989
1990	ibmvfc_init_event(evt, done: ibmvfc_scsi_done, format: IBMVFC_CMD_FORMAT);
1991	evt->cmnd = cmnd;
1992
1993	vfc_cmd = ibmvfc_init_vfc_cmd(evt, sdev: cmnd->device);
1994	iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd);
1995
1996	iu->xfer_len = cpu_to_be32(scsi_bufflen(cmnd));
1997	memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
1998
1999	if (cmnd->flags & SCMD_TAGGED) {
2000	vfc_cmd->task_tag = cpu_to_be64(scsi_cmd_to_rq(cmnd)->tag);
2001	iu->pri_task_attr = IBMVFC_SIMPLE_TASK;
2002	}
2003
2004	vfc_cmd->correlation = cpu_to_be64((u64)evt);
2005
2006	if (likely(!(rc = ibmvfc_map_sg_data(cmnd, evt, vfc_cmd, vhost->dev))))
2007	return ibmvfc_send_event(evt, vhost, timeout: 0);
2008
2009	ibmvfc_free_event(evt);
2010	if (rc == -ENOMEM)
2011	return SCSI_MLQUEUE_HOST_BUSY;
2012
2013	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2014	scmd_printk(KERN_ERR, cmnd,
2015	"Failed to map DMA buffer for command. rc=%d\n", rc);
2016
2017	cmnd->result = DID_ERROR << 16;
2018	scsi_done(cmd: cmnd);
2019	return 0;
2020	}
2021
2022	/**
2023	* ibmvfc_sync_completion - Signal that a synchronous command has completed
2024	* @evt: ibmvfc event struct
2025	*
2026	**/
2027	static void ibmvfc_sync_completion(struct ibmvfc_event *evt)
2028	{
2029	/* copy the response back */
2030	if (evt->sync_iu)
2031	*evt->sync_iu = *evt->xfer_iu;
2032
2033	complete(&evt->comp);
2034	}
2035
2036	/**
2037	* ibmvfc_bsg_timeout_done - Completion handler for cancelling BSG commands
2038	* @evt: struct ibmvfc_event
2039	*
2040	**/
2041	static void ibmvfc_bsg_timeout_done(struct ibmvfc_event *evt)
2042	{
2043	struct ibmvfc_host *vhost = evt->vhost;
2044
2045	ibmvfc_free_event(evt);
2046	vhost->aborting_passthru = 0;
2047	dev_info(vhost->dev, "Passthru command cancelled\n");
2048	}
2049
2050	/**
2051	* ibmvfc_bsg_timeout - Handle a BSG timeout
2052	* @job: struct bsg_job that timed out
2053	*
2054	* Returns:
2055	* 0 on success / other on failure
2056	**/
2057	static int ibmvfc_bsg_timeout(struct bsg_job *job)
2058	{
2059	struct ibmvfc_host *vhost = shost_priv(shost: fc_bsg_to_shost(job));
2060	unsigned long port_id = (unsigned long)job->dd_data;
2061	struct ibmvfc_event *evt;
2062	struct ibmvfc_tmf *tmf;
2063	unsigned long flags;
2064	int rc;
2065
2066	ENTER;
2067	spin_lock_irqsave(vhost->host->host_lock, flags);
2068	if (vhost->aborting_passthru || vhost->state != IBMVFC_ACTIVE) {
2069	__ibmvfc_reset_host(vhost);
2070	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2071	return 0;
2072	}
2073
2074	vhost->aborting_passthru = 1;
2075	evt = ibmvfc_get_reserved_event(&vhost->crq);
2076	if (!evt) {
2077	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2078	return -ENOMEM;
2079	}
2080
2081	ibmvfc_init_event(evt, done: ibmvfc_bsg_timeout_done, format: IBMVFC_MAD_FORMAT);
2082
2083	tmf = &evt->iu.tmf;
2084	memset(tmf, 0, sizeof(*tmf));
2085	tmf->common.version = cpu_to_be32(1);
2086	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2087	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2088	tmf->scsi_id = cpu_to_be64(port_id);
2089	tmf->cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2090	tmf->my_cancel_key = cpu_to_be32(IBMVFC_INTERNAL_CANCEL_KEY);
2091	rc = ibmvfc_send_event(evt, vhost, timeout: default_timeout);
2092
2093	if (rc != 0) {
2094	vhost->aborting_passthru = 0;
2095	dev_err(vhost->dev, "Failed to send cancel event. rc=%d\n", rc);
2096	rc = -EIO;
2097	} else
2098	dev_info(vhost->dev, "Cancelling passthru command to port id 0x%lx\n",
2099	port_id);
2100
2101	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2102
2103	LEAVE;
2104	return rc;
2105	}
2106
2107	/**
2108	* ibmvfc_bsg_plogi - PLOGI into a target to handle a BSG command
2109	* @vhost: struct ibmvfc_host to send command
2110	* @port_id: port ID to send command
2111	*
2112	* Returns:
2113	* 0 on success / other on failure
2114	**/
2115	static int ibmvfc_bsg_plogi(struct ibmvfc_host *vhost, unsigned int port_id)
2116	{
2117	struct ibmvfc_port_login *plogi;
2118	struct ibmvfc_target *tgt;
2119	struct ibmvfc_event *evt;
2120	union ibmvfc_iu rsp_iu;
2121	unsigned long flags;
2122	int rc = 0, issue_login = 1;
2123
2124	ENTER;
2125	spin_lock_irqsave(vhost->host->host_lock, flags);
2126	list_for_each_entry(tgt, &vhost->targets, queue) {
2127	if (tgt->scsi_id == port_id) {
2128	issue_login = 0;
2129	break;
2130	}
2131	}
2132
2133	if (!issue_login)
2134	goto unlock_out;
2135	if (unlikely((rc = ibmvfc_host_chkready(vhost))))
2136	goto unlock_out;
2137
2138	evt = ibmvfc_get_reserved_event(&vhost->crq);
2139	if (!evt) {
2140	rc = -ENOMEM;
2141	goto unlock_out;
2142	}
2143	ibmvfc_init_event(evt, done: ibmvfc_sync_completion, format: IBMVFC_MAD_FORMAT);
2144	plogi = &evt->iu.plogi;
2145	memset(plogi, 0, sizeof(*plogi));
2146	plogi->common.version = cpu_to_be32(1);
2147	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
2148	plogi->common.length = cpu_to_be16(sizeof(*plogi));
2149	plogi->scsi_id = cpu_to_be64(port_id);
2150	evt->sync_iu = &rsp_iu;
2151	init_completion(x: &evt->comp);
2152
2153	rc = ibmvfc_send_event(evt, vhost, timeout: default_timeout);
2154	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2155
2156	if (rc)
2157	return -EIO;
2158
2159	wait_for_completion(&evt->comp);
2160
2161	if (rsp_iu.plogi.common.status)
2162	rc = -EIO;
2163
2164	spin_lock_irqsave(vhost->host->host_lock, flags);
2165	ibmvfc_free_event(evt);
2166	unlock_out:
2167	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2168	LEAVE;
2169	return rc;
2170	}
2171
2172	/**
2173	* ibmvfc_bsg_request - Handle a BSG request
2174	* @job: struct bsg_job to be executed
2175	*
2176	* Returns:
2177	* 0 on success / other on failure
2178	**/
2179	static int ibmvfc_bsg_request(struct bsg_job *job)
2180	{
2181	struct ibmvfc_host *vhost = shost_priv(shost: fc_bsg_to_shost(job));
2182	struct fc_rport *rport = fc_bsg_to_rport(job);
2183	struct ibmvfc_passthru_mad *mad;
2184	struct ibmvfc_event *evt;
2185	union ibmvfc_iu rsp_iu;
2186	unsigned long flags, port_id = -1;
2187	struct fc_bsg_request *bsg_request = job->request;
2188	struct fc_bsg_reply *bsg_reply = job->reply;
2189	unsigned int code = bsg_request->msgcode;
2190	int rc = 0, req_seg, rsp_seg, issue_login = 0;
2191	u32 fc_flags, rsp_len;
2192
2193	ENTER;
2194	bsg_reply->reply_payload_rcv_len = 0;
2195	if (rport)
2196	port_id = rport->port_id;
2197
2198	switch (code) {
2199	case FC_BSG_HST_ELS_NOLOGIN:
2200	port_id = (bsg_request->rqst_data.h_els.port_id[0] << 16) |
2201	(bsg_request->rqst_data.h_els.port_id[1] << 8) |
2202	bsg_request->rqst_data.h_els.port_id[2];
2203	fallthrough;
2204	case FC_BSG_RPT_ELS:
2205	fc_flags = IBMVFC_FC_ELS;
2206	break;
2207	case FC_BSG_HST_CT:
2208	issue_login = 1;
2209	port_id = (bsg_request->rqst_data.h_ct.port_id[0] << 16) |
2210	(bsg_request->rqst_data.h_ct.port_id[1] << 8) |
2211	bsg_request->rqst_data.h_ct.port_id[2];
2212	fallthrough;
2213	case FC_BSG_RPT_CT:
2214	fc_flags = IBMVFC_FC_CT_IU;
2215	break;
2216	default:
2217	return -ENOTSUPP;
2218	}
2219
2220	if (port_id == -1)
2221	return -EINVAL;
2222	if (!mutex_trylock(lock: &vhost->passthru_mutex))
2223	return -EBUSY;
2224
2225	job->dd_data = (void *)port_id;
2226	req_seg = dma_map_sg(vhost->dev, job->request_payload.sg_list,
2227	job->request_payload.sg_cnt, DMA_TO_DEVICE);
2228
2229	if (!req_seg) {
2230	mutex_unlock(lock: &vhost->passthru_mutex);
2231	return -ENOMEM;
2232	}
2233
2234	rsp_seg = dma_map_sg(vhost->dev, job->reply_payload.sg_list,
2235	job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2236
2237	if (!rsp_seg) {
2238	dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2239	job->request_payload.sg_cnt, DMA_TO_DEVICE);
2240	mutex_unlock(lock: &vhost->passthru_mutex);
2241	return -ENOMEM;
2242	}
2243
2244	if (req_seg > 1 || rsp_seg > 1) {
2245	rc = -EINVAL;
2246	goto out;
2247	}
2248
2249	if (issue_login)
2250	rc = ibmvfc_bsg_plogi(vhost, port_id);
2251
2252	spin_lock_irqsave(vhost->host->host_lock, flags);
2253
2254	if (unlikely(rc || (rport && (rc = fc_remote_port_chkready(rport)))) ||
2255	unlikely((rc = ibmvfc_host_chkready(vhost)))) {
2256	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2257	goto out;
2258	}
2259
2260	evt = ibmvfc_get_reserved_event(&vhost->crq);
2261	if (!evt) {
2262	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2263	rc = -ENOMEM;
2264	goto out;
2265	}
2266	ibmvfc_init_event(evt, done: ibmvfc_sync_completion, format: IBMVFC_MAD_FORMAT);
2267	mad = &evt->iu.passthru;
2268
2269	memset(mad, 0, sizeof(*mad));
2270	mad->common.version = cpu_to_be32(1);
2271	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
2272	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
2273
2274	mad->cmd_ioba.va = cpu_to_be64(be64_to_cpu(evt->crq.ioba) +
2275	offsetof(struct ibmvfc_passthru_mad, iu));
2276	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
2277
2278	mad->iu.cmd_len = cpu_to_be32(job->request_payload.payload_len);
2279	mad->iu.rsp_len = cpu_to_be32(job->reply_payload.payload_len);
2280	mad->iu.flags = cpu_to_be32(fc_flags);
2281	mad->iu.cancel_key = cpu_to_be32(IBMVFC_PASSTHRU_CANCEL_KEY);
2282
2283	mad->iu.cmd.va = cpu_to_be64(sg_dma_address(job->request_payload.sg_list));
2284	mad->iu.cmd.len = cpu_to_be32(sg_dma_len(job->request_payload.sg_list));
2285	mad->iu.rsp.va = cpu_to_be64(sg_dma_address(job->reply_payload.sg_list));
2286	mad->iu.rsp.len = cpu_to_be32(sg_dma_len(job->reply_payload.sg_list));
2287	mad->iu.scsi_id = cpu_to_be64(port_id);
2288	mad->iu.tag = cpu_to_be64((u64)evt);
2289	rsp_len = be32_to_cpu(mad->iu.rsp.len);
2290
2291	evt->sync_iu = &rsp_iu;
2292	init_completion(x: &evt->comp);
2293	rc = ibmvfc_send_event(evt, vhost, timeout: 0);
2294	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2295
2296	if (rc) {
2297	rc = -EIO;
2298	goto out;
2299	}
2300
2301	wait_for_completion(&evt->comp);
2302
2303	if (rsp_iu.passthru.common.status)
2304	rc = -EIO;
2305	else
2306	bsg_reply->reply_payload_rcv_len = rsp_len;
2307
2308	spin_lock_irqsave(vhost->host->host_lock, flags);
2309	ibmvfc_free_event(evt);
2310	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2311	bsg_reply->result = rc;
2312	bsg_job_done(job, result: bsg_reply->result,
2313	reply_payload_rcv_len: bsg_reply->reply_payload_rcv_len);
2314	rc = 0;
2315	out:
2316	dma_unmap_sg(vhost->dev, job->request_payload.sg_list,
2317	job->request_payload.sg_cnt, DMA_TO_DEVICE);
2318	dma_unmap_sg(vhost->dev, job->reply_payload.sg_list,
2319	job->reply_payload.sg_cnt, DMA_FROM_DEVICE);
2320	mutex_unlock(lock: &vhost->passthru_mutex);
2321	LEAVE;
2322	return rc;
2323	}
2324
2325	/**
2326	* ibmvfc_reset_device - Reset the device with the specified reset type
2327	* @sdev: scsi device to reset
2328	* @type: reset type
2329	* @desc: reset type description for log messages
2330	*
2331	* Returns:
2332	* 0 on success / other on failure
2333	**/
2334	static int ibmvfc_reset_device(struct scsi_device *sdev, int type, char *desc)
2335	{
2336	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2337	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2338	struct ibmvfc_cmd *tmf;
2339	struct ibmvfc_event *evt = NULL;
2340	union ibmvfc_iu rsp_iu;
2341	struct ibmvfc_fcp_cmd_iu *iu;
2342	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd: &rsp_iu.cmd);
2343	int rsp_rc = -EBUSY;
2344	unsigned long flags;
2345	int rsp_code = 0;
2346
2347	spin_lock_irqsave(vhost->host->host_lock, flags);
2348	if (vhost->state == IBMVFC_ACTIVE) {
2349	if (vhost->using_channels)
2350	evt = ibmvfc_get_event(&vhost->scsi_scrqs.scrqs[0]);
2351	else
2352	evt = ibmvfc_get_event(&vhost->crq);
2353
2354	if (!evt) {
2355	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2356	return -ENOMEM;
2357	}
2358
2359	ibmvfc_init_event(evt, done: ibmvfc_sync_completion, format: IBMVFC_CMD_FORMAT);
2360	tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2361	iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd: tmf);
2362
2363	tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2364	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2365	tmf->target_wwpn = cpu_to_be64(rport->port_name);
2366	iu->tmf_flags = type;
2367	evt->sync_iu = &rsp_iu;
2368
2369	init_completion(x: &evt->comp);
2370	rsp_rc = ibmvfc_send_event(evt, vhost, timeout: default_timeout);
2371	}
2372	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2373
2374	if (rsp_rc != 0) {
2375	sdev_printk(KERN_ERR, sdev, "Failed to send %s reset event. rc=%d\n",
2376	desc, rsp_rc);
2377	return -EIO;
2378	}
2379
2380	sdev_printk(KERN_INFO, sdev, "Resetting %s\n", desc);
2381	wait_for_completion(&evt->comp);
2382
2383	if (rsp_iu.cmd.status)
2384	rsp_code = ibmvfc_get_err_result(vhost, vfc_cmd: &rsp_iu.cmd);
2385
2386	if (rsp_code) {
2387	if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2388	rsp_code = fc_rsp->data.info.rsp_code;
2389
2390	sdev_printk(KERN_ERR, sdev, "%s reset failed: %s (%x:%x) "
2391	"flags: %x fcp_rsp: %x, scsi_status: %x\n", desc,
2392	ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2393	be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2394	fc_rsp->scsi_status);
2395	rsp_rc = -EIO;
2396	} else
2397	sdev_printk(KERN_INFO, sdev, "%s reset successful\n", desc);
2398
2399	spin_lock_irqsave(vhost->host->host_lock, flags);
2400	ibmvfc_free_event(evt);
2401	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2402	return rsp_rc;
2403	}
2404
2405	/**
2406	* ibmvfc_match_rport - Match function for specified remote port
2407	* @evt: ibmvfc event struct
2408	* @rport: device to match
2409	*
2410	* Returns:
2411	* 1 if event matches rport / 0 if event does not match rport
2412	**/
2413	static int ibmvfc_match_rport(struct ibmvfc_event *evt, void *rport)
2414	{
2415	struct fc_rport *cmd_rport;
2416
2417	if (evt->cmnd) {
2418	cmd_rport = starget_to_rport(scsi_target(evt->cmnd->device));
2419	if (cmd_rport == rport)
2420	return 1;
2421	}
2422	return 0;
2423	}
2424
2425	/**
2426	* ibmvfc_match_target - Match function for specified target
2427	* @evt: ibmvfc event struct
2428	* @device: device to match (starget)
2429	*
2430	* Returns:
2431	* 1 if event matches starget / 0 if event does not match starget
2432	**/
2433	static int ibmvfc_match_target(struct ibmvfc_event *evt, void *device)
2434	{
2435	if (evt->cmnd && scsi_target(sdev: evt->cmnd->device) == device)
2436	return 1;
2437	return 0;
2438	}
2439
2440	/**
2441	* ibmvfc_match_lun - Match function for specified LUN
2442	* @evt: ibmvfc event struct
2443	* @device: device to match (sdev)
2444	*
2445	* Returns:
2446	* 1 if event matches sdev / 0 if event does not match sdev
2447	**/
2448	static int ibmvfc_match_lun(struct ibmvfc_event *evt, void *device)
2449	{
2450	if (evt->cmnd && evt->cmnd->device == device)
2451	return 1;
2452	return 0;
2453	}
2454
2455	/**
2456	* ibmvfc_event_is_free - Check if event is free or not
2457	* @evt: ibmvfc event struct
2458	*
2459	* Returns:
2460	* true / false
2461	**/
2462	static bool ibmvfc_event_is_free(struct ibmvfc_event *evt)
2463	{
2464	struct ibmvfc_event *loop_evt;
2465
2466	list_for_each_entry(loop_evt, &evt->queue->free, queue_list)
2467	if (loop_evt == evt)
2468	return true;
2469
2470	return false;
2471	}
2472
2473	/**
2474	* ibmvfc_wait_for_ops - Wait for ops to complete
2475	* @vhost: ibmvfc host struct
2476	* @device: device to match (starget or sdev)
2477	* @match: match function
2478	*
2479	* Returns:
2480	* SUCCESS / FAILED
2481	**/
2482	static int ibmvfc_wait_for_ops(struct ibmvfc_host *vhost, void *device,
2483	int (*match) (struct ibmvfc_event *, void *))
2484	{
2485	struct ibmvfc_event *evt;
2486	DECLARE_COMPLETION_ONSTACK(comp);
2487	int wait, i, q_index, q_size;
2488	unsigned long flags;
2489	signed long timeout = IBMVFC_ABORT_WAIT_TIMEOUT * HZ;
2490	struct ibmvfc_queue *queues;
2491
2492	ENTER;
2493	if (vhost->mq_enabled && vhost->using_channels) {
2494	queues = vhost->scsi_scrqs.scrqs;
2495	q_size = vhost->scsi_scrqs.active_queues;
2496	} else {
2497	queues = &vhost->crq;
2498	q_size = 1;
2499	}
2500
2501	do {
2502	wait = 0;
2503	spin_lock_irqsave(vhost->host->host_lock, flags);
2504	for (q_index = 0; q_index < q_size; q_index++) {
2505	spin_lock(lock: &queues[q_index].l_lock);
2506	for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2507	evt = &queues[q_index].evt_pool.events[i];
2508	if (!ibmvfc_event_is_free(evt)) {
2509	if (match(evt, device)) {
2510	evt->eh_comp = &comp;
2511	wait++;
2512	}
2513	}
2514	}
2515	spin_unlock(lock: &queues[q_index].l_lock);
2516	}
2517	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2518
2519	if (wait) {
2520	timeout = wait_for_completion_timeout(x: &comp, timeout);
2521
2522	if (!timeout) {
2523	wait = 0;
2524	spin_lock_irqsave(vhost->host->host_lock, flags);
2525	for (q_index = 0; q_index < q_size; q_index++) {
2526	spin_lock(lock: &queues[q_index].l_lock);
2527	for (i = 0; i < queues[q_index].evt_pool.size; i++) {
2528	evt = &queues[q_index].evt_pool.events[i];
2529	if (!ibmvfc_event_is_free(evt)) {
2530	if (match(evt, device)) {
2531	evt->eh_comp = NULL;
2532	wait++;
2533	}
2534	}
2535	}
2536	spin_unlock(lock: &queues[q_index].l_lock);
2537	}
2538	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2539	if (wait)
2540	dev_err(vhost->dev, "Timed out waiting for aborted commands\n");
2541	LEAVE;
2542	return wait ? FAILED : SUCCESS;
2543	}
2544	}
2545	} while (wait);
2546
2547	LEAVE;
2548	return SUCCESS;
2549	}
2550
2551	static struct ibmvfc_event *ibmvfc_init_tmf(struct ibmvfc_queue *queue,
2552	struct scsi_device *sdev,
2553	int type)
2554	{
2555	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2556	struct scsi_target *starget = scsi_target(sdev);
2557	struct fc_rport *rport = starget_to_rport(starget);
2558	struct ibmvfc_event *evt;
2559	struct ibmvfc_tmf *tmf;
2560
2561	evt = ibmvfc_get_reserved_event(queue);
2562	if (!evt)
2563	return NULL;
2564	ibmvfc_init_event(evt, done: ibmvfc_sync_completion, format: IBMVFC_MAD_FORMAT);
2565
2566	tmf = &evt->iu.tmf;
2567	memset(tmf, 0, sizeof(*tmf));
2568	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
2569	tmf->common.version = cpu_to_be32(2);
2570	tmf->target_wwpn = cpu_to_be64(rport->port_name);
2571	} else {
2572	tmf->common.version = cpu_to_be32(1);
2573	}
2574	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
2575	tmf->common.length = cpu_to_be16(sizeof(*tmf));
2576	tmf->scsi_id = cpu_to_be64(rport->port_id);
2577	int_to_scsilun(sdev->lun, &tmf->lun);
2578	if (!ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPRESS_ABTS))
2579	type &= ~IBMVFC_TMF_SUPPRESS_ABTS;
2580	if (vhost->state == IBMVFC_ACTIVE)
2581	tmf->flags = cpu_to_be32((type | IBMVFC_TMF_LUA_VALID));
2582	else
2583	tmf->flags = cpu_to_be32(((type & IBMVFC_TMF_SUPPRESS_ABTS) | IBMVFC_TMF_LUA_VALID));
2584	tmf->cancel_key = cpu_to_be32((unsigned long)sdev->hostdata);
2585	tmf->my_cancel_key = cpu_to_be32((unsigned long)starget->hostdata);
2586
2587	init_completion(x: &evt->comp);
2588
2589	return evt;
2590	}
2591
2592	static int ibmvfc_cancel_all_mq(struct scsi_device *sdev, int type)
2593	{
2594	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2595	struct ibmvfc_event *evt, *found_evt, *temp;
2596	struct ibmvfc_queue *queues = vhost->scsi_scrqs.scrqs;
2597	unsigned long flags;
2598	int num_hwq, i;
2599	int fail = 0;
2600	LIST_HEAD(cancelq);
2601	u16 status;
2602
2603	ENTER;
2604	spin_lock_irqsave(vhost->host->host_lock, flags);
2605	num_hwq = vhost->scsi_scrqs.active_queues;
2606	for (i = 0; i < num_hwq; i++) {
2607	spin_lock(lock: queues[i].q_lock);
2608	spin_lock(lock: &queues[i].l_lock);
2609	found_evt = NULL;
2610	list_for_each_entry(evt, &queues[i].sent, queue_list) {
2611	if (evt->cmnd && evt->cmnd->device == sdev) {
2612	found_evt = evt;
2613	break;
2614	}
2615	}
2616	spin_unlock(lock: &queues[i].l_lock);
2617
2618	if (found_evt && vhost->logged_in) {
2619	evt = ibmvfc_init_tmf(queue: &queues[i], sdev, type);
2620	if (!evt) {
2621	spin_unlock(lock: queues[i].q_lock);
2622	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2623	return -ENOMEM;
2624	}
2625	evt->sync_iu = &queues[i].cancel_rsp;
2626	ibmvfc_send_event(evt, vhost, timeout: default_timeout);
2627	list_add_tail(new: &evt->cancel, head: &cancelq);
2628	}
2629
2630	spin_unlock(lock: queues[i].q_lock);
2631	}
2632	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2633
2634	if (list_empty(head: &cancelq)) {
2635	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2636	sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2637	return 0;
2638	}
2639
2640	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2641
2642	list_for_each_entry_safe(evt, temp, &cancelq, cancel) {
2643	wait_for_completion(&evt->comp);
2644	status = be16_to_cpu(evt->queue->cancel_rsp.mad_common.status);
2645	list_del(entry: &evt->cancel);
2646	ibmvfc_free_event(evt);
2647
2648	if (status != IBMVFC_MAD_SUCCESS) {
2649	sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2650	switch (status) {
2651	case IBMVFC_MAD_DRIVER_FAILED:
2652	case IBMVFC_MAD_CRQ_ERROR:
2653	/* Host adapter most likely going through reset, return success to
2654	* the caller will wait for the command being cancelled to get returned
2655	*/
2656	break;
2657	default:
2658	fail = 1;
2659	break;
2660	}
2661	}
2662	}
2663
2664	if (fail)
2665	return -EIO;
2666
2667	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2668	LEAVE;
2669	return 0;
2670	}
2671
2672	static int ibmvfc_cancel_all_sq(struct scsi_device *sdev, int type)
2673	{
2674	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2675	struct ibmvfc_event *evt, *found_evt;
2676	union ibmvfc_iu rsp;
2677	int rsp_rc = -EBUSY;
2678	unsigned long flags;
2679	u16 status;
2680
2681	ENTER;
2682	found_evt = NULL;
2683	spin_lock_irqsave(vhost->host->host_lock, flags);
2684	spin_lock(lock: &vhost->crq.l_lock);
2685	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2686	if (evt->cmnd && evt->cmnd->device == sdev) {
2687	found_evt = evt;
2688	break;
2689	}
2690	}
2691	spin_unlock(lock: &vhost->crq.l_lock);
2692
2693	if (!found_evt) {
2694	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2695	sdev_printk(KERN_INFO, sdev, "No events found to cancel\n");
2696	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2697	return 0;
2698	}
2699
2700	if (vhost->logged_in) {
2701	evt = ibmvfc_init_tmf(queue: &vhost->crq, sdev, type);
2702	evt->sync_iu = &rsp;
2703	rsp_rc = ibmvfc_send_event(evt, vhost, timeout: default_timeout);
2704	}
2705
2706	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2707
2708	if (rsp_rc != 0) {
2709	sdev_printk(KERN_ERR, sdev, "Failed to send cancel event. rc=%d\n", rsp_rc);
2710	/* If failure is received, the host adapter is most likely going
2711	through reset, return success so the caller will wait for the command
2712	being cancelled to get returned */
2713	return 0;
2714	}
2715
2716	sdev_printk(KERN_INFO, sdev, "Cancelling outstanding commands.\n");
2717
2718	wait_for_completion(&evt->comp);
2719	status = be16_to_cpu(rsp.mad_common.status);
2720	spin_lock_irqsave(vhost->host->host_lock, flags);
2721	ibmvfc_free_event(evt);
2722	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2723
2724	if (status != IBMVFC_MAD_SUCCESS) {
2725	sdev_printk(KERN_WARNING, sdev, "Cancel failed with rc=%x\n", status);
2726	switch (status) {
2727	case IBMVFC_MAD_DRIVER_FAILED:
2728	case IBMVFC_MAD_CRQ_ERROR:
2729	/* Host adapter most likely going through reset, return success to
2730	the caller will wait for the command being cancelled to get returned */
2731	return 0;
2732	default:
2733	return -EIO;
2734	};
2735	}
2736
2737	sdev_printk(KERN_INFO, sdev, "Successfully cancelled outstanding commands\n");
2738	return 0;
2739	}
2740
2741	/**
2742	* ibmvfc_cancel_all - Cancel all outstanding commands to the device
2743	* @sdev: scsi device to cancel commands
2744	* @type: type of error recovery being performed
2745	*
2746	* This sends a cancel to the VIOS for the specified device. This does
2747	* NOT send any abort to the actual device. That must be done separately.
2748	*
2749	* Returns:
2750	* 0 on success / other on failure
2751	**/
2752	static int ibmvfc_cancel_all(struct scsi_device *sdev, int type)
2753	{
2754	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2755
2756	if (vhost->mq_enabled && vhost->using_channels)
2757	return ibmvfc_cancel_all_mq(sdev, type);
2758	else
2759	return ibmvfc_cancel_all_sq(sdev, type);
2760	}
2761
2762	/**
2763	* ibmvfc_match_key - Match function for specified cancel key
2764	* @evt: ibmvfc event struct
2765	* @key: cancel key to match
2766	*
2767	* Returns:
2768	* 1 if event matches key / 0 if event does not match key
2769	**/
2770	static int ibmvfc_match_key(struct ibmvfc_event *evt, void *key)
2771	{
2772	unsigned long cancel_key = (unsigned long)key;
2773
2774	if (evt->crq.format == IBMVFC_CMD_FORMAT &&
2775	be32_to_cpu(evt->iu.cmd.cancel_key) == cancel_key)
2776	return 1;
2777	return 0;
2778	}
2779
2780	/**
2781	* ibmvfc_match_evt - Match function for specified event
2782	* @evt: ibmvfc event struct
2783	* @match: event to match
2784	*
2785	* Returns:
2786	* 1 if event matches key / 0 if event does not match key
2787	**/
2788	static int ibmvfc_match_evt(struct ibmvfc_event *evt, void *match)
2789	{
2790	if (evt == match)
2791	return 1;
2792	return 0;
2793	}
2794
2795	/**
2796	* ibmvfc_abort_task_set - Abort outstanding commands to the device
2797	* @sdev: scsi device to abort commands
2798	*
2799	* This sends an Abort Task Set to the VIOS for the specified device. This does
2800	* NOT send any cancel to the VIOS. That must be done separately.
2801	*
2802	* Returns:
2803	* 0 on success / other on failure
2804	**/
2805	static int ibmvfc_abort_task_set(struct scsi_device *sdev)
2806	{
2807	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2808	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2809	struct ibmvfc_cmd *tmf;
2810	struct ibmvfc_event *evt, *found_evt;
2811	union ibmvfc_iu rsp_iu;
2812	struct ibmvfc_fcp_cmd_iu *iu;
2813	struct ibmvfc_fcp_rsp *fc_rsp = ibmvfc_get_fcp_rsp(vhost, vfc_cmd: &rsp_iu.cmd);
2814	int rc, rsp_rc = -EBUSY;
2815	unsigned long flags, timeout = IBMVFC_ABORT_TIMEOUT;
2816	int rsp_code = 0;
2817
2818	found_evt = NULL;
2819	spin_lock_irqsave(vhost->host->host_lock, flags);
2820	spin_lock(lock: &vhost->crq.l_lock);
2821	list_for_each_entry(evt, &vhost->crq.sent, queue_list) {
2822	if (evt->cmnd && evt->cmnd->device == sdev) {
2823	found_evt = evt;
2824	break;
2825	}
2826	}
2827	spin_unlock(lock: &vhost->crq.l_lock);
2828
2829	if (!found_evt) {
2830	if (vhost->log_level > IBMVFC_DEFAULT_LOG_LEVEL)
2831	sdev_printk(KERN_INFO, sdev, "No events found to abort\n");
2832	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2833	return 0;
2834	}
2835
2836	if (vhost->state == IBMVFC_ACTIVE) {
2837	evt = ibmvfc_get_event(&vhost->crq);
2838	if (!evt) {
2839	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2840	return -ENOMEM;
2841	}
2842	ibmvfc_init_event(evt, done: ibmvfc_sync_completion, format: IBMVFC_CMD_FORMAT);
2843	tmf = ibmvfc_init_vfc_cmd(evt, sdev);
2844	iu = ibmvfc_get_fcp_iu(vhost, vfc_cmd: tmf);
2845
2846	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN))
2847	tmf->target_wwpn = cpu_to_be64(rport->port_name);
2848	iu->tmf_flags = IBMVFC_ABORT_TASK_SET;
2849	tmf->flags = cpu_to_be16((IBMVFC_NO_MEM_DESC | IBMVFC_TMF));
2850	evt->sync_iu = &rsp_iu;
2851
2852	tmf->correlation = cpu_to_be64((u64)evt);
2853
2854	init_completion(x: &evt->comp);
2855	rsp_rc = ibmvfc_send_event(evt, vhost, timeout: default_timeout);
2856	}
2857
2858	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2859
2860	if (rsp_rc != 0) {
2861	sdev_printk(KERN_ERR, sdev, "Failed to send abort. rc=%d\n", rsp_rc);
2862	return -EIO;
2863	}
2864
2865	sdev_printk(KERN_INFO, sdev, "Aborting outstanding commands\n");
2866	timeout = wait_for_completion_timeout(x: &evt->comp, timeout);
2867
2868	if (!timeout) {
2869	rc = ibmvfc_cancel_all(sdev, type: 0);
2870	if (!rc) {
2871	rc = ibmvfc_wait_for_ops(vhost, device: sdev->hostdata, match: ibmvfc_match_key);
2872	if (rc == SUCCESS)
2873	rc = 0;
2874	}
2875
2876	if (rc) {
2877	sdev_printk(KERN_INFO, sdev, "Cancel failed, resetting host\n");
2878	ibmvfc_reset_host(vhost);
2879	rsp_rc = -EIO;
2880	rc = ibmvfc_wait_for_ops(vhost, device: sdev->hostdata, match: ibmvfc_match_key);
2881
2882	if (rc == SUCCESS)
2883	rsp_rc = 0;
2884
2885	rc = ibmvfc_wait_for_ops(vhost, device: evt, match: ibmvfc_match_evt);
2886	if (rc != SUCCESS) {
2887	spin_lock_irqsave(vhost->host->host_lock, flags);
2888	ibmvfc_hard_reset_host(vhost);
2889	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2890	rsp_rc = 0;
2891	}
2892
2893	goto out;
2894	}
2895	}
2896
2897	if (rsp_iu.cmd.status)
2898	rsp_code = ibmvfc_get_err_result(vhost, vfc_cmd: &rsp_iu.cmd);
2899
2900	if (rsp_code) {
2901	if (fc_rsp->flags & FCP_RSP_LEN_VALID)
2902	rsp_code = fc_rsp->data.info.rsp_code;
2903
2904	sdev_printk(KERN_ERR, sdev, "Abort failed: %s (%x:%x) "
2905	"flags: %x fcp_rsp: %x, scsi_status: %x\n",
2906	ibmvfc_get_cmd_error(be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error)),
2907	be16_to_cpu(rsp_iu.cmd.status), be16_to_cpu(rsp_iu.cmd.error), fc_rsp->flags, rsp_code,
2908	fc_rsp->scsi_status);
2909	rsp_rc = -EIO;
2910	} else
2911	sdev_printk(KERN_INFO, sdev, "Abort successful\n");
2912
2913	out:
2914	spin_lock_irqsave(vhost->host->host_lock, flags);
2915	ibmvfc_free_event(evt);
2916	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
2917	return rsp_rc;
2918	}
2919
2920	/**
2921	* ibmvfc_eh_abort_handler - Abort a command
2922	* @cmd: scsi command to abort
2923	*
2924	* Returns:
2925	* SUCCESS / FAST_IO_FAIL / FAILED
2926	**/
2927	static int ibmvfc_eh_abort_handler(struct scsi_cmnd *cmd)
2928	{
2929	struct scsi_device *sdev = cmd->device;
2930	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2931	int cancel_rc, block_rc;
2932	int rc = FAILED;
2933
2934	ENTER;
2935	block_rc = fc_block_scsi_eh(cmnd: cmd);
2936	ibmvfc_wait_while_resetting(vhost);
2937	if (block_rc != FAST_IO_FAIL) {
2938	cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_ABORT_TASK_SET);
2939	ibmvfc_abort_task_set(sdev);
2940	} else
2941	cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2942
2943	if (!cancel_rc)
2944	rc = ibmvfc_wait_for_ops(vhost, device: sdev, match: ibmvfc_match_lun);
2945
2946	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2947	rc = FAST_IO_FAIL;
2948
2949	LEAVE;
2950	return rc;
2951	}
2952
2953	/**
2954	* ibmvfc_eh_device_reset_handler - Reset a single LUN
2955	* @cmd: scsi command struct
2956	*
2957	* Returns:
2958	* SUCCESS / FAST_IO_FAIL / FAILED
2959	**/
2960	static int ibmvfc_eh_device_reset_handler(struct scsi_cmnd *cmd)
2961	{
2962	struct scsi_device *sdev = cmd->device;
2963	struct ibmvfc_host *vhost = shost_priv(shost: sdev->host);
2964	int cancel_rc, block_rc, reset_rc = 0;
2965	int rc = FAILED;
2966
2967	ENTER;
2968	block_rc = fc_block_scsi_eh(cmnd: cmd);
2969	ibmvfc_wait_while_resetting(vhost);
2970	if (block_rc != FAST_IO_FAIL) {
2971	cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_LUN_RESET);
2972	reset_rc = ibmvfc_reset_device(sdev, type: IBMVFC_LUN_RESET, desc: "LUN");
2973	} else
2974	cancel_rc = ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2975
2976	if (!cancel_rc && !reset_rc)
2977	rc = ibmvfc_wait_for_ops(vhost, device: sdev, match: ibmvfc_match_lun);
2978
2979	if (block_rc == FAST_IO_FAIL && rc != FAILED)
2980	rc = FAST_IO_FAIL;
2981
2982	LEAVE;
2983	return rc;
2984	}
2985
2986	/**
2987	* ibmvfc_dev_cancel_all_noreset - Device iterated cancel all function
2988	* @sdev: scsi device struct
2989	* @data: return code
2990	*
2991	**/
2992	static void ibmvfc_dev_cancel_all_noreset(struct scsi_device *sdev, void *data)
2993	{
2994	unsigned long *rc = data;
2995	*rc |= ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
2996	}
2997
2998	/**
2999	* ibmvfc_eh_target_reset_handler - Reset the target
3000	* @cmd: scsi command struct
3001	*
3002	* Returns:
3003	* SUCCESS / FAST_IO_FAIL / FAILED
3004	**/
3005	static int ibmvfc_eh_target_reset_handler(struct scsi_cmnd *cmd)
3006	{
3007	struct scsi_target *starget = scsi_target(sdev: cmd->device);
3008	struct fc_rport *rport = starget_to_rport(starget);
3009	struct Scsi_Host *shost = rport_to_shost(rport);
3010	struct ibmvfc_host *vhost = shost_priv(shost);
3011	int block_rc;
3012	int reset_rc = 0;
3013	int rc = FAILED;
3014	unsigned long cancel_rc = 0;
3015	bool tgt_reset = false;
3016
3017	ENTER;
3018	block_rc = fc_block_rport(rport);
3019	ibmvfc_wait_while_resetting(vhost);
3020	if (block_rc != FAST_IO_FAIL) {
3021	struct scsi_device *sdev;
3022
3023	shost_for_each_device(sdev, shost) {
3024	if ((sdev->channel != starget->channel) ||
3025	(sdev->id != starget->id))
3026	continue;
3027
3028	cancel_rc |= ibmvfc_cancel_all(sdev,
3029	IBMVFC_TMF_TGT_RESET);
3030	if (!tgt_reset) {
3031	reset_rc = ibmvfc_reset_device(sdev,
3032	type: IBMVFC_TARGET_RESET, desc: "target");
3033	tgt_reset = true;
3034	}
3035	}
3036	} else
3037	starget_for_each_device(starget, &cancel_rc,
3038	fn: ibmvfc_dev_cancel_all_noreset);
3039
3040	if (!cancel_rc && !reset_rc)
3041	rc = ibmvfc_wait_for_ops(vhost, device: starget, match: ibmvfc_match_target);
3042
3043	if (block_rc == FAST_IO_FAIL && rc != FAILED)
3044	rc = FAST_IO_FAIL;
3045
3046	LEAVE;
3047	return rc;
3048	}
3049
3050	/**
3051	* ibmvfc_eh_host_reset_handler - Reset the connection to the server
3052	* @cmd: struct scsi_cmnd having problems
3053	*
3054	**/
3055	static int ibmvfc_eh_host_reset_handler(struct scsi_cmnd *cmd)
3056	{
3057	int rc;
3058	struct ibmvfc_host *vhost = shost_priv(shost: cmd->device->host);
3059
3060	dev_err(vhost->dev, "Resetting connection due to error recovery\n");
3061	rc = ibmvfc_issue_fc_host_lip(shost: vhost->host);
3062
3063	return rc ? FAILED : SUCCESS;
3064	}
3065
3066	/**
3067	* ibmvfc_terminate_rport_io - Terminate all pending I/O to the rport.
3068	* @rport: rport struct
3069	*
3070	* Return value:
3071	* none
3072	**/
3073	static void ibmvfc_terminate_rport_io(struct fc_rport *rport)
3074	{
3075	struct Scsi_Host *shost = rport_to_shost(rport);
3076	struct ibmvfc_host *vhost = shost_priv(shost);
3077	struct fc_rport *dev_rport;
3078	struct scsi_device *sdev;
3079	struct ibmvfc_target *tgt;
3080	unsigned long rc, flags;
3081	unsigned int found;
3082
3083	ENTER;
3084	shost_for_each_device(sdev, shost) {
3085	dev_rport = starget_to_rport(scsi_target(sdev));
3086	if (dev_rport != rport)
3087	continue;
3088	ibmvfc_cancel_all(sdev, IBMVFC_TMF_SUPPRESS_ABTS);
3089	}
3090
3091	rc = ibmvfc_wait_for_ops(vhost, device: rport, match: ibmvfc_match_rport);
3092
3093	if (rc == FAILED)
3094	ibmvfc_issue_fc_host_lip(shost);
3095
3096	spin_lock_irqsave(shost->host_lock, flags);
3097	found = 0;
3098	list_for_each_entry(tgt, &vhost->targets, queue) {
3099	if (tgt->scsi_id == rport->port_id) {
3100	found++;
3101	break;
3102	}
3103	}
3104
3105	if (found && tgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
3106	/*
3107	* If we get here, that means we previously attempted to send
3108	* an implicit logout to the target but it failed, most likely
3109	* due to I/O being pending, so we need to send it again
3110	*/
3111	ibmvfc_del_tgt(tgt);
3112	ibmvfc_reinit_host(vhost);
3113	}
3114
3115	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3116	LEAVE;
3117	}
3118
3119	static const struct ibmvfc_async_desc ae_desc [] = {
3120	{ "PLOGI", IBMVFC_AE_ELS_PLOGI, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3121	{ "LOGO", IBMVFC_AE_ELS_LOGO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3122	{ "PRLO", IBMVFC_AE_ELS_PRLO, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3123	{ "N-Port SCN", IBMVFC_AE_SCN_NPORT, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3124	{ "Group SCN", IBMVFC_AE_SCN_GROUP, IBMVFC_DEFAULT_LOG_LEVEL + 1 },
3125	{ "Domain SCN", IBMVFC_AE_SCN_DOMAIN, IBMVFC_DEFAULT_LOG_LEVEL },
3126	{ "Fabric SCN", IBMVFC_AE_SCN_FABRIC, IBMVFC_DEFAULT_LOG_LEVEL },
3127	{ "Link Up", IBMVFC_AE_LINK_UP, IBMVFC_DEFAULT_LOG_LEVEL },
3128	{ "Link Down", IBMVFC_AE_LINK_DOWN, IBMVFC_DEFAULT_LOG_LEVEL },
3129	{ "Link Dead", IBMVFC_AE_LINK_DEAD, IBMVFC_DEFAULT_LOG_LEVEL },
3130	{ "Halt", IBMVFC_AE_HALT, IBMVFC_DEFAULT_LOG_LEVEL },
3131	{ "Resume", IBMVFC_AE_RESUME, IBMVFC_DEFAULT_LOG_LEVEL },
3132	{ "Adapter Failed", IBMVFC_AE_ADAPTER_FAILED, IBMVFC_DEFAULT_LOG_LEVEL },
3133	};
3134
3135	static const struct ibmvfc_async_desc unknown_ae = {
3136	"Unknown async", 0, IBMVFC_DEFAULT_LOG_LEVEL
3137	};
3138
3139	/**
3140	* ibmvfc_get_ae_desc - Get text description for async event
3141	* @ae: async event
3142	*
3143	**/
3144	static const struct ibmvfc_async_desc *ibmvfc_get_ae_desc(u64 ae)
3145	{
3146	int i;
3147
3148	for (i = 0; i < ARRAY_SIZE(ae_desc); i++)
3149	if (ae_desc[i].ae == ae)
3150	return &ae_desc[i];
3151
3152	return &unknown_ae;
3153	}
3154
3155	static const struct {
3156	enum ibmvfc_ae_link_state state;
3157	const char *desc;
3158	} link_desc [] = {
3159	{ IBMVFC_AE_LS_LINK_UP, " link up" },
3160	{ IBMVFC_AE_LS_LINK_BOUNCED, " link bounced" },
3161	{ IBMVFC_AE_LS_LINK_DOWN, " link down" },
3162	{ IBMVFC_AE_LS_LINK_DEAD, " link dead" },
3163	};
3164
3165	/**
3166	* ibmvfc_get_link_state - Get text description for link state
3167	* @state: link state
3168	*
3169	**/
3170	static const char *ibmvfc_get_link_state(enum ibmvfc_ae_link_state state)
3171	{
3172	int i;
3173
3174	for (i = 0; i < ARRAY_SIZE(link_desc); i++)
3175	if (link_desc[i].state == state)
3176	return link_desc[i].desc;
3177
3178	return "";
3179	}
3180
3181	/**
3182	* ibmvfc_handle_async - Handle an async event from the adapter
3183	* @crq: crq to process
3184	* @vhost: ibmvfc host struct
3185	*
3186	**/
3187	static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
3188	struct ibmvfc_host *vhost)
3189	{
3190	const struct ibmvfc_async_desc *desc = ibmvfc_get_ae_desc(be64_to_cpu(crq->event));
3191	struct ibmvfc_target *tgt;
3192
3193	ibmvfc_log(vhost, desc->log_level, "%s event received. scsi_id: %llx, wwpn: %llx,"
3194	" node_name: %llx%s\n", desc->desc, be64_to_cpu(crq->scsi_id),
3195	be64_to_cpu(crq->wwpn), be64_to_cpu(crq->node_name),
3196	ibmvfc_get_link_state(crq->link_state));
3197
3198	switch (be64_to_cpu(crq->event)) {
3199	case IBMVFC_AE_RESUME:
3200	switch (crq->link_state) {
3201	case IBMVFC_AE_LS_LINK_DOWN:
3202	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DOWN);
3203	break;
3204	case IBMVFC_AE_LS_LINK_DEAD:
3205	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
3206	break;
3207	case IBMVFC_AE_LS_LINK_UP:
3208	case IBMVFC_AE_LS_LINK_BOUNCED:
3209	default:
3210	vhost->events_to_log |= IBMVFC_AE_LINKUP;
3211	vhost->delay_init = 1;
3212	__ibmvfc_reset_host(vhost);
3213	break;
3214	}
3215
3216	break;
3217	case IBMVFC_AE_LINK_UP:
3218	vhost->events_to_log |= IBMVFC_AE_LINKUP;
3219	vhost->delay_init = 1;
3220	__ibmvfc_reset_host(vhost);
3221	break;
3222	case IBMVFC_AE_SCN_FABRIC:
3223	case IBMVFC_AE_SCN_DOMAIN:
3224	vhost->events_to_log |= IBMVFC_AE_RSCN;
3225	if (vhost->state < IBMVFC_HALTED) {
3226	vhost->delay_init = 1;
3227	__ibmvfc_reset_host(vhost);
3228	}
3229	break;
3230	case IBMVFC_AE_SCN_NPORT:
3231	case IBMVFC_AE_SCN_GROUP:
3232	vhost->events_to_log |= IBMVFC_AE_RSCN;
3233	ibmvfc_reinit_host(vhost);
3234	break;
3235	case IBMVFC_AE_ELS_LOGO:
3236	case IBMVFC_AE_ELS_PRLO:
3237	case IBMVFC_AE_ELS_PLOGI:
3238	list_for_each_entry(tgt, &vhost->targets, queue) {
3239	if (!crq->scsi_id && !crq->wwpn && !crq->node_name)
3240	break;
3241	if (crq->scsi_id && cpu_to_be64(tgt->scsi_id) != crq->scsi_id)
3242	continue;
3243	if (crq->wwpn && cpu_to_be64(tgt->ids.port_name) != crq->wwpn)
3244	continue;
3245	if (crq->node_name && cpu_to_be64(tgt->ids.node_name) != crq->node_name)
3246	continue;
3247	if (tgt->need_login && be64_to_cpu(crq->event) == IBMVFC_AE_ELS_LOGO)
3248	tgt->logo_rcvd = 1;
3249	if (!tgt->need_login || be64_to_cpu(crq->event) == IBMVFC_AE_ELS_PLOGI) {
3250	ibmvfc_del_tgt(tgt);
3251	ibmvfc_reinit_host(vhost);
3252	}
3253	}
3254	break;
3255	case IBMVFC_AE_LINK_DOWN:
3256	case IBMVFC_AE_ADAPTER_FAILED:
3257	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DOWN);
3258	break;
3259	case IBMVFC_AE_LINK_DEAD:
3260	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
3261	break;
3262	case IBMVFC_AE_HALT:
3263	ibmvfc_link_down(vhost, state: IBMVFC_HALTED);
3264	break;
3265	default:
3266	dev_err(vhost->dev, "Unknown async event received: %lld\n", crq->event);
3267	break;
3268	}
3269	}
3270
3271	/**
3272	* ibmvfc_handle_crq - Handles and frees received events in the CRQ
3273	* @crq: Command/Response queue
3274	* @vhost: ibmvfc host struct
3275	* @evt_doneq: Event done queue
3276	*
3277	**/
3278	static void ibmvfc_handle_crq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3279	struct list_head *evt_doneq)
3280	{
3281	long rc;
3282	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3283
3284	switch (crq->valid) {
3285	case IBMVFC_CRQ_INIT_RSP:
3286	switch (crq->format) {
3287	case IBMVFC_CRQ_INIT:
3288	dev_info(vhost->dev, "Partner initialized\n");
3289	/* Send back a response */
3290	rc = ibmvfc_send_crq_init_complete(vhost);
3291	if (rc == 0)
3292	ibmvfc_init_host(vhost);
3293	else
3294	dev_err(vhost->dev, "Unable to send init rsp. rc=%ld\n", rc);
3295	break;
3296	case IBMVFC_CRQ_INIT_COMPLETE:
3297	dev_info(vhost->dev, "Partner initialization complete\n");
3298	ibmvfc_init_host(vhost);
3299	break;
3300	default:
3301	dev_err(vhost->dev, "Unknown crq message type: %d\n", crq->format);
3302	}
3303	return;
3304	case IBMVFC_CRQ_XPORT_EVENT:
3305	vhost->state = IBMVFC_NO_CRQ;
3306	vhost->logged_in = 0;
3307	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_NONE);
3308	if (crq->format == IBMVFC_PARTITION_MIGRATED) {
3309	/* We need to re-setup the interpartition connection */
3310	dev_info(vhost->dev, "Partition migrated, Re-enabling adapter\n");
3311	vhost->client_migrated = 1;
3312
3313	scsi_block_requests(vhost->host);
3314	ibmvfc_purge_requests(vhost, error_code: DID_REQUEUE);
3315	ibmvfc_set_host_state(vhost, state: IBMVFC_LINK_DOWN);
3316	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_REENABLE);
3317	wake_up(&vhost->work_wait_q);
3318	} else if (crq->format == IBMVFC_PARTNER_FAILED || crq->format == IBMVFC_PARTNER_DEREGISTER) {
3319	dev_err(vhost->dev, "Host partner adapter deregistered or failed (rc=%d)\n", crq->format);
3320	ibmvfc_purge_requests(vhost, error_code: DID_ERROR);
3321	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DOWN);
3322	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_RESET);
3323	} else {
3324	dev_err(vhost->dev, "Received unknown transport event from partner (rc=%d)\n", crq->format);
3325	}
3326	return;
3327	case IBMVFC_CRQ_CMD_RSP:
3328	break;
3329	default:
3330	dev_err(vhost->dev, "Got an invalid message type 0x%02x\n", crq->valid);
3331	return;
3332	}
3333
3334	if (crq->format == IBMVFC_ASYNC_EVENT)
3335	return;
3336
3337	/* The only kind of payload CRQs we should get are responses to
3338	* things we send. Make sure this response is to something we
3339	* actually sent
3340	*/
3341	if (unlikely(!ibmvfc_valid_event(&vhost->crq.evt_pool, evt))) {
3342	dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3343	crq->ioba);
3344	return;
3345	}
3346
3347	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3348	dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3349	crq->ioba);
3350	return;
3351	}
3352
3353	spin_lock(lock: &evt->queue->l_lock);
3354	list_move_tail(list: &evt->queue_list, head: evt_doneq);
3355	spin_unlock(lock: &evt->queue->l_lock);
3356	}
3357
3358	/**
3359	* ibmvfc_scan_finished - Check if the device scan is done.
3360	* @shost: scsi host struct
3361	* @time: current elapsed time
3362	*
3363	* Returns:
3364	* 0 if scan is not done / 1 if scan is done
3365	**/
3366	static int ibmvfc_scan_finished(struct Scsi_Host *shost, unsigned long time)
3367	{
3368	unsigned long flags;
3369	struct ibmvfc_host *vhost = shost_priv(shost);
3370	int done = 0;
3371
3372	spin_lock_irqsave(shost->host_lock, flags);
3373	if (!vhost->scan_timeout)
3374	done = 1;
3375	else if (time >= (vhost->scan_timeout * HZ)) {
3376	dev_info(vhost->dev, "Scan taking longer than %d seconds, "
3377	"continuing initialization\n", vhost->scan_timeout);
3378	done = 1;
3379	}
3380
3381	if (vhost->scan_complete) {
3382	vhost->scan_timeout = init_timeout;
3383	done = 1;
3384	}
3385	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3386	return done;
3387	}
3388
3389	/**
3390	* ibmvfc_slave_alloc - Setup the device's task set value
3391	* @sdev: struct scsi_device device to configure
3392	*
3393	* Set the device's task set value so that error handling works as
3394	* expected.
3395	*
3396	* Returns:
3397	* 0 on success / -ENXIO if device does not exist
3398	**/
3399	static int ibmvfc_slave_alloc(struct scsi_device *sdev)
3400	{
3401	struct Scsi_Host *shost = sdev->host;
3402	struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
3403	struct ibmvfc_host *vhost = shost_priv(shost);
3404	unsigned long flags = 0;
3405
3406	if (!rport || fc_remote_port_chkready(rport))
3407	return -ENXIO;
3408
3409	spin_lock_irqsave(shost->host_lock, flags);
3410	sdev->hostdata = (void *)(unsigned long)vhost->task_set++;
3411	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3412	return 0;
3413	}
3414
3415	/**
3416	* ibmvfc_target_alloc - Setup the target's task set value
3417	* @starget: struct scsi_target
3418	*
3419	* Set the target's task set value so that error handling works as
3420	* expected.
3421	*
3422	* Returns:
3423	* 0 on success / -ENXIO if device does not exist
3424	**/
3425	static int ibmvfc_target_alloc(struct scsi_target *starget)
3426	{
3427	struct Scsi_Host *shost = dev_to_shost(dev: starget->dev.parent);
3428	struct ibmvfc_host *vhost = shost_priv(shost);
3429	unsigned long flags = 0;
3430
3431	spin_lock_irqsave(shost->host_lock, flags);
3432	starget->hostdata = (void *)(unsigned long)vhost->task_set++;
3433	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3434	return 0;
3435	}
3436
3437	/**
3438	* ibmvfc_slave_configure - Configure the device
3439	* @sdev: struct scsi_device device to configure
3440	*
3441	* Enable allow_restart for a device if it is a disk. Adjust the
3442	* queue_depth here also.
3443	*
3444	* Returns:
3445	* 0
3446	**/
3447	static int ibmvfc_slave_configure(struct scsi_device *sdev)
3448	{
3449	struct Scsi_Host *shost = sdev->host;
3450	unsigned long flags = 0;
3451
3452	spin_lock_irqsave(shost->host_lock, flags);
3453	if (sdev->type == TYPE_DISK) {
3454	sdev->allow_restart = 1;
3455	blk_queue_rq_timeout(sdev->request_queue, 120 * HZ);
3456	}
3457	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3458	return 0;
3459	}
3460
3461	/**
3462	* ibmvfc_change_queue_depth - Change the device's queue depth
3463	* @sdev: scsi device struct
3464	* @qdepth: depth to set
3465	*
3466	* Return value:
3467	* actual depth set
3468	**/
3469	static int ibmvfc_change_queue_depth(struct scsi_device *sdev, int qdepth)
3470	{
3471	if (qdepth > IBMVFC_MAX_CMDS_PER_LUN)
3472	qdepth = IBMVFC_MAX_CMDS_PER_LUN;
3473
3474	return scsi_change_queue_depth(sdev, qdepth);
3475	}
3476
3477	static ssize_t ibmvfc_show_host_partition_name(struct device *dev,
3478	struct device_attribute *attr, char *buf)
3479	{
3480	struct Scsi_Host *shost = class_to_shost(dev);
3481	struct ibmvfc_host *vhost = shost_priv(shost);
3482
3483	return snprintf(buf, PAGE_SIZE, fmt: "%s\n",
3484	vhost->login_buf->resp.partition_name);
3485	}
3486
3487	static ssize_t ibmvfc_show_host_device_name(struct device *dev,
3488	struct device_attribute *attr, char *buf)
3489	{
3490	struct Scsi_Host *shost = class_to_shost(dev);
3491	struct ibmvfc_host *vhost = shost_priv(shost);
3492
3493	return snprintf(buf, PAGE_SIZE, fmt: "%s\n",
3494	vhost->login_buf->resp.device_name);
3495	}
3496
3497	static ssize_t ibmvfc_show_host_loc_code(struct device *dev,
3498	struct device_attribute *attr, char *buf)
3499	{
3500	struct Scsi_Host *shost = class_to_shost(dev);
3501	struct ibmvfc_host *vhost = shost_priv(shost);
3502
3503	return snprintf(buf, PAGE_SIZE, fmt: "%s\n",
3504	vhost->login_buf->resp.port_loc_code);
3505	}
3506
3507	static ssize_t ibmvfc_show_host_drc_name(struct device *dev,
3508	struct device_attribute *attr, char *buf)
3509	{
3510	struct Scsi_Host *shost = class_to_shost(dev);
3511	struct ibmvfc_host *vhost = shost_priv(shost);
3512
3513	return snprintf(buf, PAGE_SIZE, fmt: "%s\n",
3514	vhost->login_buf->resp.drc_name);
3515	}
3516
3517	static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
3518	struct device_attribute *attr, char *buf)
3519	{
3520	struct Scsi_Host *shost = class_to_shost(dev);
3521	struct ibmvfc_host *vhost = shost_priv(shost);
3522	return snprintf(buf, PAGE_SIZE, fmt: "%d\n", be32_to_cpu(vhost->login_buf->resp.version));
3523	}
3524
3525	static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
3526	struct device_attribute *attr, char *buf)
3527	{
3528	struct Scsi_Host *shost = class_to_shost(dev);
3529	struct ibmvfc_host *vhost = shost_priv(shost);
3530	return snprintf(buf, PAGE_SIZE, fmt: "%llx\n", be64_to_cpu(vhost->login_buf->resp.capabilities));
3531	}
3532
3533	/**
3534	* ibmvfc_show_log_level - Show the adapter's error logging level
3535	* @dev: class device struct
3536	* @attr: unused
3537	* @buf: buffer
3538	*
3539	* Return value:
3540	* number of bytes printed to buffer
3541	**/
3542	static ssize_t ibmvfc_show_log_level(struct device *dev,
3543	struct device_attribute *attr, char *buf)
3544	{
3545	struct Scsi_Host *shost = class_to_shost(dev);
3546	struct ibmvfc_host *vhost = shost_priv(shost);
3547	unsigned long flags = 0;
3548	int len;
3549
3550	spin_lock_irqsave(shost->host_lock, flags);
3551	len = snprintf(buf, PAGE_SIZE, fmt: "%d\n", vhost->log_level);
3552	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3553	return len;
3554	}
3555
3556	/**
3557	* ibmvfc_store_log_level - Change the adapter's error logging level
3558	* @dev: class device struct
3559	* @attr: unused
3560	* @buf: buffer
3561	* @count: buffer size
3562	*
3563	* Return value:
3564	* number of bytes printed to buffer
3565	**/
3566	static ssize_t ibmvfc_store_log_level(struct device *dev,
3567	struct device_attribute *attr,
3568	const char *buf, size_t count)
3569	{
3570	struct Scsi_Host *shost = class_to_shost(dev);
3571	struct ibmvfc_host *vhost = shost_priv(shost);
3572	unsigned long flags = 0;
3573
3574	spin_lock_irqsave(shost->host_lock, flags);
3575	vhost->log_level = simple_strtoul(buf, NULL, 10);
3576	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3577	return strlen(buf);
3578	}
3579
3580	static ssize_t ibmvfc_show_scsi_channels(struct device *dev,
3581	struct device_attribute *attr, char *buf)
3582	{
3583	struct Scsi_Host *shost = class_to_shost(dev);
3584	struct ibmvfc_host *vhost = shost_priv(shost);
3585	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3586	unsigned long flags = 0;
3587	int len;
3588
3589	spin_lock_irqsave(shost->host_lock, flags);
3590	len = snprintf(buf, PAGE_SIZE, fmt: "%d\n", scsi->desired_queues);
3591	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3592	return len;
3593	}
3594
3595	static ssize_t ibmvfc_store_scsi_channels(struct device *dev,
3596	struct device_attribute *attr,
3597	const char *buf, size_t count)
3598	{
3599	struct Scsi_Host *shost = class_to_shost(dev);
3600	struct ibmvfc_host *vhost = shost_priv(shost);
3601	struct ibmvfc_channels *scsi = &vhost->scsi_scrqs;
3602	unsigned long flags = 0;
3603	unsigned int channels;
3604
3605	spin_lock_irqsave(shost->host_lock, flags);
3606	channels = simple_strtoul(buf, NULL, 10);
3607	scsi->desired_queues = min(channels, shost->nr_hw_queues);
3608	ibmvfc_hard_reset_host(vhost);
3609	spin_unlock_irqrestore(lock: shost->host_lock, flags);
3610	return strlen(buf);
3611	}
3612
3613	static DEVICE_ATTR(partition_name, S_IRUGO, ibmvfc_show_host_partition_name, NULL);
3614	static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
3615	static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
3616	static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
3617	static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
3618	static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
3619	static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
3620	ibmvfc_show_log_level, ibmvfc_store_log_level);
3621	static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
3622	ibmvfc_show_scsi_channels, ibmvfc_store_scsi_channels);
3623
3624	#ifdef CONFIG_SCSI_IBMVFC_TRACE
3625	/**
3626	* ibmvfc_read_trace - Dump the adapter trace
3627	* @filp: open sysfs file
3628	* @kobj: kobject struct
3629	* @bin_attr: bin_attribute struct
3630	* @buf: buffer
3631	* @off: offset
3632	* @count: buffer size
3633	*
3634	* Return value:
3635	* number of bytes printed to buffer
3636	**/
3637	static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
3638	struct bin_attribute *bin_attr,
3639	char *buf, loff_t off, size_t count)
3640	{
3641	struct device *dev = kobj_to_dev(kobj);
3642	struct Scsi_Host *shost = class_to_shost(dev);
3643	struct ibmvfc_host *vhost = shost_priv(shost);
3644	unsigned long flags = 0;
3645	int size = IBMVFC_TRACE_SIZE;
3646	char *src = (char *)vhost->trace;
3647
3648	if (off > size)
3649	return 0;
3650	if (off + count > size) {
3651	size -= off;
3652	count = size;
3653	}
3654
3655	spin_lock_irqsave(shost->host_lock, flags);
3656	memcpy(buf, &src[off], count);
3657	spin_unlock_irqrestore(shost->host_lock, flags);
3658	return count;
3659	}
3660
3661	static struct bin_attribute ibmvfc_trace_attr = {
3662	.attr = {
3663	.name = "trace",
3664	.mode = S_IRUGO,
3665	},
3666	.size = 0,
3667	.read = ibmvfc_read_trace,
3668	};
3669	#endif
3670
3671	static struct attribute *ibmvfc_host_attrs[] = {
3672	&dev_attr_partition_name.attr,
3673	&dev_attr_device_name.attr,
3674	&dev_attr_port_loc_code.attr,
3675	&dev_attr_drc_name.attr,
3676	&dev_attr_npiv_version.attr,
3677	&dev_attr_capabilities.attr,
3678	&dev_attr_log_level.attr,
3679	&dev_attr_nr_scsi_channels.attr,
3680	NULL
3681	};
3682
3683	ATTRIBUTE_GROUPS(ibmvfc_host);
3684
3685	static const struct scsi_host_template driver_template = {
3686	.module = THIS_MODULE,
3687	.name = "IBM POWER Virtual FC Adapter",
3688	.proc_name = IBMVFC_NAME,
3689	.queuecommand = ibmvfc_queuecommand,
3690	.eh_timed_out = fc_eh_timed_out,
3691	.eh_abort_handler = ibmvfc_eh_abort_handler,
3692	.eh_device_reset_handler = ibmvfc_eh_device_reset_handler,
3693	.eh_target_reset_handler = ibmvfc_eh_target_reset_handler,
3694	.eh_host_reset_handler = ibmvfc_eh_host_reset_handler,
3695	.slave_alloc = ibmvfc_slave_alloc,
3696	.slave_configure = ibmvfc_slave_configure,
3697	.target_alloc = ibmvfc_target_alloc,
3698	.scan_finished = ibmvfc_scan_finished,
3699	.change_queue_depth = ibmvfc_change_queue_depth,
3700	.cmd_per_lun = 16,
3701	.can_queue = IBMVFC_MAX_REQUESTS_DEFAULT,
3702	.this_id = -1,
3703	.sg_tablesize = SG_ALL,
3704	.max_sectors = IBMVFC_MAX_SECTORS,
3705	.shost_groups = ibmvfc_host_groups,
3706	.track_queue_depth = 1,
3707	};
3708
3709	/**
3710	* ibmvfc_next_async_crq - Returns the next entry in async queue
3711	* @vhost: ibmvfc host struct
3712	*
3713	* Returns:
3714	* Pointer to next entry in queue / NULL if empty
3715	**/
3716	static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
3717	{
3718	struct ibmvfc_queue *async_crq = &vhost->async_crq;
3719	struct ibmvfc_async_crq *crq;
3720
3721	crq = &async_crq->msgs.async[async_crq->cur];
3722	if (crq->valid & 0x80) {
3723	if (++async_crq->cur == async_crq->size)
3724	async_crq->cur = 0;
3725	rmb();
3726	} else
3727	crq = NULL;
3728
3729	return crq;
3730	}
3731
3732	/**
3733	* ibmvfc_next_crq - Returns the next entry in message queue
3734	* @vhost: ibmvfc host struct
3735	*
3736	* Returns:
3737	* Pointer to next entry in queue / NULL if empty
3738	**/
3739	static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
3740	{
3741	struct ibmvfc_queue *queue = &vhost->crq;
3742	struct ibmvfc_crq *crq;
3743
3744	crq = &queue->msgs.crq[queue->cur];
3745	if (crq->valid & 0x80) {
3746	if (++queue->cur == queue->size)
3747	queue->cur = 0;
3748	rmb();
3749	} else
3750	crq = NULL;
3751
3752	return crq;
3753	}
3754
3755	/**
3756	* ibmvfc_interrupt - Interrupt handler
3757	* @irq: number of irq to handle, not used
3758	* @dev_instance: ibmvfc_host that received interrupt
3759	*
3760	* Returns:
3761	* IRQ_HANDLED
3762	**/
3763	static irqreturn_t ibmvfc_interrupt(int irq, void *dev_instance)
3764	{
3765	struct ibmvfc_host *vhost = (struct ibmvfc_host *)dev_instance;
3766	unsigned long flags;
3767
3768	spin_lock_irqsave(vhost->host->host_lock, flags);
3769	vio_disable_interrupts(to_vio_dev(vhost->dev));
3770	tasklet_schedule(t: &vhost->tasklet);
3771	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
3772	return IRQ_HANDLED;
3773	}
3774
3775	/**
3776	* ibmvfc_tasklet - Interrupt handler tasklet
3777	* @data: ibmvfc host struct
3778	*
3779	* Returns:
3780	* Nothing
3781	**/
3782	static void ibmvfc_tasklet(void *data)
3783	{
3784	struct ibmvfc_host *vhost = data;
3785	struct vio_dev *vdev = to_vio_dev(vhost->dev);
3786	struct ibmvfc_crq *crq;
3787	struct ibmvfc_async_crq *async;
3788	struct ibmvfc_event *evt, *temp;
3789	unsigned long flags;
3790	int done = 0;
3791	LIST_HEAD(evt_doneq);
3792
3793	spin_lock_irqsave(vhost->host->host_lock, flags);
3794	spin_lock(lock: vhost->crq.q_lock);
3795	while (!done) {
3796	/* Pull all the valid messages off the async CRQ */
3797	while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3798	ibmvfc_handle_async(crq: async, vhost);
3799	async->valid = 0;
3800	wmb();
3801	}
3802
3803	/* Pull all the valid messages off the CRQ */
3804	while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3805	ibmvfc_handle_crq(crq, vhost, evt_doneq: &evt_doneq);
3806	crq->valid = 0;
3807	wmb();
3808	}
3809
3810	vio_enable_interrupts(vdev);
3811	if ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
3812	vio_disable_interrupts(vdev);
3813	ibmvfc_handle_async(crq: async, vhost);
3814	async->valid = 0;
3815	wmb();
3816	} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
3817	vio_disable_interrupts(vdev);
3818	ibmvfc_handle_crq(crq, vhost, evt_doneq: &evt_doneq);
3819	crq->valid = 0;
3820	wmb();
3821	} else
3822	done = 1;
3823	}
3824
3825	spin_unlock(lock: vhost->crq.q_lock);
3826	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
3827
3828	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3829	del_timer(timer: &evt->timer);
3830	list_del(entry: &evt->queue_list);
3831	ibmvfc_trc_end(evt);
3832	evt->done(evt);
3833	}
3834	}
3835
3836	static int ibmvfc_toggle_scrq_irq(struct ibmvfc_queue *scrq, int enable)
3837	{
3838	struct device *dev = scrq->vhost->dev;
3839	struct vio_dev *vdev = to_vio_dev(dev);
3840	unsigned long rc;
3841	int irq_action = H_ENABLE_VIO_INTERRUPT;
3842
3843	if (!enable)
3844	irq_action = H_DISABLE_VIO_INTERRUPT;
3845
3846	rc = plpar_hcall_norets(H_VIOCTL, vdev->unit_address, irq_action,
3847	scrq->hw_irq, 0, 0);
3848
3849	if (rc)
3850	dev_err(dev, "Couldn't %s sub-crq[%lu] irq. rc=%ld\n",
3851	enable ? "enable" : "disable", scrq->hwq_id, rc);
3852
3853	return rc;
3854	}
3855
3856	static void ibmvfc_handle_scrq(struct ibmvfc_crq *crq, struct ibmvfc_host *vhost,
3857	struct list_head *evt_doneq)
3858	{
3859	struct ibmvfc_event *evt = (struct ibmvfc_event *)be64_to_cpu(crq->ioba);
3860
3861	switch (crq->valid) {
3862	case IBMVFC_CRQ_CMD_RSP:
3863	break;
3864	case IBMVFC_CRQ_XPORT_EVENT:
3865	return;
3866	default:
3867	dev_err(vhost->dev, "Got and invalid message type 0x%02x\n", crq->valid);
3868	return;
3869	}
3870
3871	/* The only kind of payload CRQs we should get are responses to
3872	* things we send. Make sure this response is to something we
3873	* actually sent
3874	*/
3875	if (unlikely(!ibmvfc_valid_event(&evt->queue->evt_pool, evt))) {
3876	dev_err(vhost->dev, "Returned correlation_token 0x%08llx is invalid!\n",
3877	crq->ioba);
3878	return;
3879	}
3880
3881	if (unlikely(atomic_dec_if_positive(&evt->active))) {
3882	dev_err(vhost->dev, "Received duplicate correlation_token 0x%08llx!\n",
3883	crq->ioba);
3884	return;
3885	}
3886
3887	spin_lock(lock: &evt->queue->l_lock);
3888	list_move_tail(list: &evt->queue_list, head: evt_doneq);
3889	spin_unlock(lock: &evt->queue->l_lock);
3890	}
3891
3892	static struct ibmvfc_crq *ibmvfc_next_scrq(struct ibmvfc_queue *scrq)
3893	{
3894	struct ibmvfc_crq *crq;
3895
3896	crq = &scrq->msgs.scrq[scrq->cur].crq;
3897	if (crq->valid & 0x80) {
3898	if (++scrq->cur == scrq->size)
3899	scrq->cur = 0;
3900	rmb();
3901	} else
3902	crq = NULL;
3903
3904	return crq;
3905	}
3906
3907	static void ibmvfc_drain_sub_crq(struct ibmvfc_queue *scrq)
3908	{
3909	struct ibmvfc_crq *crq;
3910	struct ibmvfc_event *evt, *temp;
3911	unsigned long flags;
3912	int done = 0;
3913	LIST_HEAD(evt_doneq);
3914
3915	spin_lock_irqsave(scrq->q_lock, flags);
3916	while (!done) {
3917	while ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3918	ibmvfc_handle_scrq(crq, vhost: scrq->vhost, evt_doneq: &evt_doneq);
3919	crq->valid = 0;
3920	wmb();
3921	}
3922
3923	ibmvfc_toggle_scrq_irq(scrq, enable: 1);
3924	if ((crq = ibmvfc_next_scrq(scrq)) != NULL) {
3925	ibmvfc_toggle_scrq_irq(scrq, enable: 0);
3926	ibmvfc_handle_scrq(crq, vhost: scrq->vhost, evt_doneq: &evt_doneq);
3927	crq->valid = 0;
3928	wmb();
3929	} else
3930	done = 1;
3931	}
3932	spin_unlock_irqrestore(lock: scrq->q_lock, flags);
3933
3934	list_for_each_entry_safe(evt, temp, &evt_doneq, queue_list) {
3935	del_timer(timer: &evt->timer);
3936	list_del(entry: &evt->queue_list);
3937	ibmvfc_trc_end(evt);
3938	evt->done(evt);
3939	}
3940	}
3941
3942	static irqreturn_t ibmvfc_interrupt_mq(int irq, void *scrq_instance)
3943	{
3944	struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance;
3945
3946	ibmvfc_toggle_scrq_irq(scrq, enable: 0);
3947	ibmvfc_drain_sub_crq(scrq);
3948
3949	return IRQ_HANDLED;
3950	}
3951
3952	/**
3953	* ibmvfc_init_tgt - Set the next init job step for the target
3954	* @tgt: ibmvfc target struct
3955	* @job_step: job step to perform
3956	*
3957	**/
3958	static void ibmvfc_init_tgt(struct ibmvfc_target *tgt,
3959	void (*job_step) (struct ibmvfc_target *))
3960	{
3961	if (!ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT))
3962	tgt->job_step = job_step;
3963	wake_up(&tgt->vhost->work_wait_q);
3964	}
3965
3966	/**
3967	* ibmvfc_retry_tgt_init - Attempt to retry a step in target initialization
3968	* @tgt: ibmvfc target struct
3969	* @job_step: initialization job step
3970	*
3971	* Returns: 1 if step will be retried / 0 if not
3972	*
3973	**/
3974	static int ibmvfc_retry_tgt_init(struct ibmvfc_target *tgt,
3975	void (*job_step) (struct ibmvfc_target *))
3976	{
3977	if (++tgt->init_retries > IBMVFC_MAX_TGT_INIT_RETRIES) {
3978	ibmvfc_del_tgt(tgt);
3979	wake_up(&tgt->vhost->work_wait_q);
3980	return 0;
3981	} else
3982	ibmvfc_init_tgt(tgt, job_step);
3983	return 1;
3984	}
3985
3986	/* Defined in FC-LS */
3987	static const struct {
3988	int code;
3989	int retry;
3990	int logged_in;
3991	} prli_rsp [] = {
3992	{ 0, 1, 0 },
3993	{ 1, 0, 1 },
3994	{ 2, 1, 0 },
3995	{ 3, 1, 0 },
3996	{ 4, 0, 0 },
3997	{ 5, 0, 0 },
3998	{ 6, 0, 1 },
3999	{ 7, 0, 0 },
4000	{ 8, 1, 0 },
4001	};
4002
4003	/**
4004	* ibmvfc_get_prli_rsp - Find PRLI response index
4005	* @flags: PRLI response flags
4006	*
4007	**/
4008	static int ibmvfc_get_prli_rsp(u16 flags)
4009	{
4010	int i;
4011	int code = (flags & 0x0f00) >> 8;
4012
4013	for (i = 0; i < ARRAY_SIZE(prli_rsp); i++)
4014	if (prli_rsp[i].code == code)
4015	return i;
4016
4017	return 0;
4018	}
4019
4020	/**
4021	* ibmvfc_tgt_prli_done - Completion handler for Process Login
4022	* @evt: ibmvfc event struct
4023	*
4024	**/
4025	static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
4026	{
4027	struct ibmvfc_target *tgt = evt->tgt;
4028	struct ibmvfc_host *vhost = evt->vhost;
4029	struct ibmvfc_process_login *rsp = &evt->xfer_iu->prli;
4030	struct ibmvfc_prli_svc_parms *parms = &rsp->parms;
4031	u32 status = be16_to_cpu(rsp->common.status);
4032	int index, level = IBMVFC_DEFAULT_LOG_LEVEL;
4033
4034	vhost->discovery_threads--;
4035	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4036	switch (status) {
4037	case IBMVFC_MAD_SUCCESS:
4038	tgt_dbg(tgt, "Process Login succeeded: %X %02X %04X\n",
4039	parms->type, parms->flags, parms->service_parms);
4040
4041	if (parms->type == IBMVFC_SCSI_FCP_TYPE) {
4042	index = ibmvfc_get_prli_rsp(be16_to_cpu(parms->flags));
4043	if (prli_rsp[index].logged_in) {
4044	if (be16_to_cpu(parms->flags) & IBMVFC_PRLI_EST_IMG_PAIR) {
4045	tgt->need_login = 0;
4046	tgt->ids.roles = 0;
4047	if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_TARGET_FUNC)
4048	tgt->ids.roles |= FC_PORT_ROLE_FCP_TARGET;
4049	if (be32_to_cpu(parms->service_parms) & IBMVFC_PRLI_INITIATOR_FUNC)
4050	tgt->ids.roles |= FC_PORT_ROLE_FCP_INITIATOR;
4051	tgt->add_rport = 1;
4052	} else
4053	ibmvfc_del_tgt(tgt);
4054	} else if (prli_rsp[index].retry)
4055	ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_prli);
4056	else
4057	ibmvfc_del_tgt(tgt);
4058	} else
4059	ibmvfc_del_tgt(tgt);
4060	break;
4061	case IBMVFC_MAD_DRIVER_FAILED:
4062	break;
4063	case IBMVFC_MAD_CRQ_ERROR:
4064	ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_prli);
4065	break;
4066	case IBMVFC_MAD_FAILED:
4067	default:
4068	if ((be16_to_cpu(rsp->status) & IBMVFC_VIOS_FAILURE) &&
4069	be16_to_cpu(rsp->error) == IBMVFC_PLOGI_REQUIRED)
4070	level += ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_plogi);
4071	else if (tgt->logo_rcvd)
4072	level += ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_plogi);
4073	else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4074	level += ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_prli);
4075	else
4076	ibmvfc_del_tgt(tgt);
4077
4078	tgt_log(tgt, level, "Process Login failed: %s (%x:%x) rc=0x%02X\n",
4079	ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4080	be16_to_cpu(rsp->status), be16_to_cpu(rsp->error), status);
4081	break;
4082	}
4083
4084	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4085	ibmvfc_free_event(evt);
4086	wake_up(&vhost->work_wait_q);
4087	}
4088
4089	/**
4090	* ibmvfc_tgt_send_prli - Send a process login
4091	* @tgt: ibmvfc target struct
4092	*
4093	**/
4094	static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
4095	{
4096	struct ibmvfc_process_login *prli;
4097	struct ibmvfc_host *vhost = tgt->vhost;
4098	struct ibmvfc_event *evt;
4099
4100	if (vhost->discovery_threads >= disc_threads)
4101	return;
4102
4103	kref_get(kref: &tgt->kref);
4104	evt = ibmvfc_get_reserved_event(&vhost->crq);
4105	if (!evt) {
4106	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4107	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4108	__ibmvfc_reset_host(vhost);
4109	return;
4110	}
4111	vhost->discovery_threads++;
4112	ibmvfc_init_event(evt, done: ibmvfc_tgt_prli_done, format: IBMVFC_MAD_FORMAT);
4113	evt->tgt = tgt;
4114	prli = &evt->iu.prli;
4115	memset(prli, 0, sizeof(*prli));
4116	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4117	prli->common.version = cpu_to_be32(2);
4118	prli->target_wwpn = cpu_to_be64(tgt->wwpn);
4119	} else {
4120	prli->common.version = cpu_to_be32(1);
4121	}
4122	prli->common.opcode = cpu_to_be32(IBMVFC_PROCESS_LOGIN);
4123	prli->common.length = cpu_to_be16(sizeof(*prli));
4124	prli->scsi_id = cpu_to_be64(tgt->scsi_id);
4125
4126	prli->parms.type = IBMVFC_SCSI_FCP_TYPE;
4127	prli->parms.flags = cpu_to_be16(IBMVFC_PRLI_EST_IMG_PAIR);
4128	prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
4129	prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
4130
4131	if (cls3_error)
4132	prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
4133
4134	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT_WAIT);
4135	if (ibmvfc_send_event(evt, vhost, timeout: default_timeout)) {
4136	vhost->discovery_threads--;
4137	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4138	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4139	} else
4140	tgt_dbg(tgt, "Sent process login\n");
4141	}
4142
4143	/**
4144	* ibmvfc_tgt_plogi_done - Completion handler for Port Login
4145	* @evt: ibmvfc event struct
4146	*
4147	**/
4148	static void ibmvfc_tgt_plogi_done(struct ibmvfc_event *evt)
4149	{
4150	struct ibmvfc_target *tgt = evt->tgt;
4151	struct ibmvfc_host *vhost = evt->vhost;
4152	struct ibmvfc_port_login *rsp = &evt->xfer_iu->plogi;
4153	u32 status = be16_to_cpu(rsp->common.status);
4154	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4155
4156	vhost->discovery_threads--;
4157	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4158	switch (status) {
4159	case IBMVFC_MAD_SUCCESS:
4160	tgt_dbg(tgt, "Port Login succeeded\n");
4161	if (tgt->ids.port_name &&
4162	tgt->ids.port_name != wwn_to_u64(wwn: rsp->service_parms.port_name)) {
4163	vhost->reinit = 1;
4164	tgt_dbg(tgt, "Port re-init required\n");
4165	break;
4166	}
4167	tgt->ids.node_name = wwn_to_u64(wwn: rsp->service_parms.node_name);
4168	tgt->ids.port_name = wwn_to_u64(wwn: rsp->service_parms.port_name);
4169	tgt->ids.port_id = tgt->scsi_id;
4170	memcpy(&tgt->service_parms, &rsp->service_parms,
4171	sizeof(tgt->service_parms));
4172	memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4173	sizeof(tgt->service_parms_change));
4174	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_send_prli);
4175	break;
4176	case IBMVFC_MAD_DRIVER_FAILED:
4177	break;
4178	case IBMVFC_MAD_CRQ_ERROR:
4179	ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_plogi);
4180	break;
4181	case IBMVFC_MAD_FAILED:
4182	default:
4183	if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4184	level += ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_send_plogi);
4185	else
4186	ibmvfc_del_tgt(tgt);
4187
4188	tgt_log(tgt, level, "Port Login failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4189	ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4190	be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4191	ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4192	ibmvfc_get_ls_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain), status);
4193	break;
4194	}
4195
4196	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4197	ibmvfc_free_event(evt);
4198	wake_up(&vhost->work_wait_q);
4199	}
4200
4201	/**
4202	* ibmvfc_tgt_send_plogi - Send PLOGI to the specified target
4203	* @tgt: ibmvfc target struct
4204	*
4205	**/
4206	static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
4207	{
4208	struct ibmvfc_port_login *plogi;
4209	struct ibmvfc_host *vhost = tgt->vhost;
4210	struct ibmvfc_event *evt;
4211
4212	if (vhost->discovery_threads >= disc_threads)
4213	return;
4214
4215	kref_get(kref: &tgt->kref);
4216	tgt->logo_rcvd = 0;
4217	evt = ibmvfc_get_reserved_event(&vhost->crq);
4218	if (!evt) {
4219	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4220	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4221	__ibmvfc_reset_host(vhost);
4222	return;
4223	}
4224	vhost->discovery_threads++;
4225	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT_WAIT);
4226	ibmvfc_init_event(evt, done: ibmvfc_tgt_plogi_done, format: IBMVFC_MAD_FORMAT);
4227	evt->tgt = tgt;
4228	plogi = &evt->iu.plogi;
4229	memset(plogi, 0, sizeof(*plogi));
4230	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4231	plogi->common.version = cpu_to_be32(2);
4232	plogi->target_wwpn = cpu_to_be64(tgt->wwpn);
4233	} else {
4234	plogi->common.version = cpu_to_be32(1);
4235	}
4236	plogi->common.opcode = cpu_to_be32(IBMVFC_PORT_LOGIN);
4237	plogi->common.length = cpu_to_be16(sizeof(*plogi));
4238	plogi->scsi_id = cpu_to_be64(tgt->scsi_id);
4239
4240	if (ibmvfc_send_event(evt, vhost, timeout: default_timeout)) {
4241	vhost->discovery_threads--;
4242	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4243	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4244	} else
4245	tgt_dbg(tgt, "Sent port login\n");
4246	}
4247
4248	/**
4249	* ibmvfc_tgt_implicit_logout_done - Completion handler for Implicit Logout MAD
4250	* @evt: ibmvfc event struct
4251	*
4252	**/
4253	static void ibmvfc_tgt_implicit_logout_done(struct ibmvfc_event *evt)
4254	{
4255	struct ibmvfc_target *tgt = evt->tgt;
4256	struct ibmvfc_host *vhost = evt->vhost;
4257	struct ibmvfc_implicit_logout *rsp = &evt->xfer_iu->implicit_logout;
4258	u32 status = be16_to_cpu(rsp->common.status);
4259
4260	vhost->discovery_threads--;
4261	ibmvfc_free_event(evt);
4262	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4263
4264	switch (status) {
4265	case IBMVFC_MAD_SUCCESS:
4266	tgt_dbg(tgt, "Implicit Logout succeeded\n");
4267	break;
4268	case IBMVFC_MAD_DRIVER_FAILED:
4269	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4270	wake_up(&vhost->work_wait_q);
4271	return;
4272	case IBMVFC_MAD_FAILED:
4273	default:
4274	tgt_err(tgt, "Implicit Logout failed: rc=0x%02X\n", status);
4275	break;
4276	}
4277
4278	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_send_plogi);
4279	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4280	wake_up(&vhost->work_wait_q);
4281	}
4282
4283	/**
4284	* __ibmvfc_tgt_get_implicit_logout_evt - Allocate and init an event for implicit logout
4285	* @tgt: ibmvfc target struct
4286	* @done: Routine to call when the event is responded to
4287	*
4288	* Returns:
4289	* Allocated and initialized ibmvfc_event struct
4290	**/
4291	static struct ibmvfc_event *__ibmvfc_tgt_get_implicit_logout_evt(struct ibmvfc_target *tgt,
4292	void (*done) (struct ibmvfc_event *))
4293	{
4294	struct ibmvfc_implicit_logout *mad;
4295	struct ibmvfc_host *vhost = tgt->vhost;
4296	struct ibmvfc_event *evt;
4297
4298	kref_get(kref: &tgt->kref);
4299	evt = ibmvfc_get_reserved_event(&vhost->crq);
4300	if (!evt)
4301	return NULL;
4302	ibmvfc_init_event(evt, done, format: IBMVFC_MAD_FORMAT);
4303	evt->tgt = tgt;
4304	mad = &evt->iu.implicit_logout;
4305	memset(mad, 0, sizeof(*mad));
4306	mad->common.version = cpu_to_be32(1);
4307	mad->common.opcode = cpu_to_be32(IBMVFC_IMPLICIT_LOGOUT);
4308	mad->common.length = cpu_to_be16(sizeof(*mad));
4309	mad->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4310	return evt;
4311	}
4312
4313	/**
4314	* ibmvfc_tgt_implicit_logout - Initiate an Implicit Logout for specified target
4315	* @tgt: ibmvfc target struct
4316	*
4317	**/
4318	static void ibmvfc_tgt_implicit_logout(struct ibmvfc_target *tgt)
4319	{
4320	struct ibmvfc_host *vhost = tgt->vhost;
4321	struct ibmvfc_event *evt;
4322
4323	if (vhost->discovery_threads >= disc_threads)
4324	return;
4325
4326	vhost->discovery_threads++;
4327	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4328	done: ibmvfc_tgt_implicit_logout_done);
4329	if (!evt) {
4330	vhost->discovery_threads--;
4331	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4332	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4333	__ibmvfc_reset_host(vhost);
4334	return;
4335	}
4336
4337	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT_WAIT);
4338	if (ibmvfc_send_event(evt, vhost, timeout: default_timeout)) {
4339	vhost->discovery_threads--;
4340	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4341	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4342	} else
4343	tgt_dbg(tgt, "Sent Implicit Logout\n");
4344	}
4345
4346	/**
4347	* ibmvfc_tgt_implicit_logout_and_del_done - Completion handler for Implicit Logout MAD
4348	* @evt: ibmvfc event struct
4349	*
4350	**/
4351	static void ibmvfc_tgt_implicit_logout_and_del_done(struct ibmvfc_event *evt)
4352	{
4353	struct ibmvfc_target *tgt = evt->tgt;
4354	struct ibmvfc_host *vhost = evt->vhost;
4355	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4356	u32 status = be16_to_cpu(mad->common.status);
4357
4358	vhost->discovery_threads--;
4359	ibmvfc_free_event(evt);
4360
4361	/*
4362	* If our state is IBMVFC_HOST_OFFLINE, we could be unloading the
4363	* driver in which case we need to free up all the targets. If we are
4364	* not unloading, we will still go through a hard reset to get out of
4365	* offline state, so there is no need to track the old targets in that
4366	* case.
4367	*/
4368	if (status == IBMVFC_MAD_SUCCESS || vhost->state == IBMVFC_HOST_OFFLINE)
4369	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DEL_RPORT);
4370	else
4371	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT);
4372
4373	tgt_dbg(tgt, "Implicit Logout %s\n", (status == IBMVFC_MAD_SUCCESS) ? "succeeded" : "failed");
4374	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4375	wake_up(&vhost->work_wait_q);
4376	}
4377
4378	/**
4379	* ibmvfc_tgt_implicit_logout_and_del - Initiate an Implicit Logout for specified target
4380	* @tgt: ibmvfc target struct
4381	*
4382	**/
4383	static void ibmvfc_tgt_implicit_logout_and_del(struct ibmvfc_target *tgt)
4384	{
4385	struct ibmvfc_host *vhost = tgt->vhost;
4386	struct ibmvfc_event *evt;
4387
4388	if (!vhost->logged_in) {
4389	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DEL_RPORT);
4390	return;
4391	}
4392
4393	if (vhost->discovery_threads >= disc_threads)
4394	return;
4395
4396	vhost->discovery_threads++;
4397	evt = __ibmvfc_tgt_get_implicit_logout_evt(tgt,
4398	done: ibmvfc_tgt_implicit_logout_and_del_done);
4399
4400	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT);
4401	if (ibmvfc_send_event(evt, vhost, timeout: default_timeout)) {
4402	vhost->discovery_threads--;
4403	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DEL_RPORT);
4404	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4405	} else
4406	tgt_dbg(tgt, "Sent Implicit Logout\n");
4407	}
4408
4409	/**
4410	* ibmvfc_tgt_move_login_done - Completion handler for Move Login
4411	* @evt: ibmvfc event struct
4412	*
4413	**/
4414	static void ibmvfc_tgt_move_login_done(struct ibmvfc_event *evt)
4415	{
4416	struct ibmvfc_target *tgt = evt->tgt;
4417	struct ibmvfc_host *vhost = evt->vhost;
4418	struct ibmvfc_move_login *rsp = &evt->xfer_iu->move_login;
4419	u32 status = be16_to_cpu(rsp->common.status);
4420	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4421
4422	vhost->discovery_threads--;
4423	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4424	switch (status) {
4425	case IBMVFC_MAD_SUCCESS:
4426	tgt_dbg(tgt, "Move Login succeeded for new scsi_id: %llX\n", tgt->new_scsi_id);
4427	tgt->ids.node_name = wwn_to_u64(wwn: rsp->service_parms.node_name);
4428	tgt->ids.port_name = wwn_to_u64(wwn: rsp->service_parms.port_name);
4429	tgt->scsi_id = tgt->new_scsi_id;
4430	tgt->ids.port_id = tgt->scsi_id;
4431	memcpy(&tgt->service_parms, &rsp->service_parms,
4432	sizeof(tgt->service_parms));
4433	memcpy(&tgt->service_parms_change, &rsp->service_parms_change,
4434	sizeof(tgt->service_parms_change));
4435	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_send_prli);
4436	break;
4437	case IBMVFC_MAD_DRIVER_FAILED:
4438	break;
4439	case IBMVFC_MAD_CRQ_ERROR:
4440	ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_move_login);
4441	break;
4442	case IBMVFC_MAD_FAILED:
4443	default:
4444	level += ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_move_login);
4445
4446	tgt_log(tgt, level,
4447	"Move Login failed: new scsi_id: %llX, flags:%x, vios_flags:%x, rc=0x%02X\n",
4448	tgt->new_scsi_id, be32_to_cpu(rsp->flags), be16_to_cpu(rsp->vios_flags),
4449	status);
4450	break;
4451	}
4452
4453	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4454	ibmvfc_free_event(evt);
4455	wake_up(&vhost->work_wait_q);
4456	}
4457
4458
4459	/**
4460	* ibmvfc_tgt_move_login - Initiate a move login for specified target
4461	* @tgt: ibmvfc target struct
4462	*
4463	**/
4464	static void ibmvfc_tgt_move_login(struct ibmvfc_target *tgt)
4465	{
4466	struct ibmvfc_host *vhost = tgt->vhost;
4467	struct ibmvfc_move_login *move;
4468	struct ibmvfc_event *evt;
4469
4470	if (vhost->discovery_threads >= disc_threads)
4471	return;
4472
4473	kref_get(kref: &tgt->kref);
4474	evt = ibmvfc_get_reserved_event(&vhost->crq);
4475	if (!evt) {
4476	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DEL_RPORT);
4477	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4478	__ibmvfc_reset_host(vhost);
4479	return;
4480	}
4481	vhost->discovery_threads++;
4482	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT_WAIT);
4483	ibmvfc_init_event(evt, done: ibmvfc_tgt_move_login_done, format: IBMVFC_MAD_FORMAT);
4484	evt->tgt = tgt;
4485	move = &evt->iu.move_login;
4486	memset(move, 0, sizeof(*move));
4487	move->common.version = cpu_to_be32(1);
4488	move->common.opcode = cpu_to_be32(IBMVFC_MOVE_LOGIN);
4489	move->common.length = cpu_to_be16(sizeof(*move));
4490
4491	move->old_scsi_id = cpu_to_be64(tgt->scsi_id);
4492	move->new_scsi_id = cpu_to_be64(tgt->new_scsi_id);
4493	move->wwpn = cpu_to_be64(tgt->wwpn);
4494	move->node_name = cpu_to_be64(tgt->ids.node_name);
4495
4496	if (ibmvfc_send_event(evt, vhost, timeout: default_timeout)) {
4497	vhost->discovery_threads--;
4498	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DEL_RPORT);
4499	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4500	} else
4501	tgt_dbg(tgt, "Sent Move Login for new scsi_id: %llX\n", tgt->new_scsi_id);
4502	}
4503
4504	/**
4505	* ibmvfc_adisc_needs_plogi - Does device need PLOGI?
4506	* @mad: ibmvfc passthru mad struct
4507	* @tgt: ibmvfc target struct
4508	*
4509	* Returns:
4510	* 1 if PLOGI needed / 0 if PLOGI not needed
4511	**/
4512	static int ibmvfc_adisc_needs_plogi(struct ibmvfc_passthru_mad *mad,
4513	struct ibmvfc_target *tgt)
4514	{
4515	if (wwn_to_u64(wwn: (u8 *)&mad->fc_iu.response[2]) != tgt->ids.port_name)
4516	return 1;
4517	if (wwn_to_u64(wwn: (u8 *)&mad->fc_iu.response[4]) != tgt->ids.node_name)
4518	return 1;
4519	if (be32_to_cpu(mad->fc_iu.response[6]) != tgt->scsi_id)
4520	return 1;
4521	return 0;
4522	}
4523
4524	/**
4525	* ibmvfc_tgt_adisc_done - Completion handler for ADISC
4526	* @evt: ibmvfc event struct
4527	*
4528	**/
4529	static void ibmvfc_tgt_adisc_done(struct ibmvfc_event *evt)
4530	{
4531	struct ibmvfc_target *tgt = evt->tgt;
4532	struct ibmvfc_host *vhost = evt->vhost;
4533	struct ibmvfc_passthru_mad *mad = &evt->xfer_iu->passthru;
4534	u32 status = be16_to_cpu(mad->common.status);
4535	u8 fc_reason, fc_explain;
4536
4537	vhost->discovery_threads--;
4538	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4539	del_timer(timer: &tgt->timer);
4540
4541	switch (status) {
4542	case IBMVFC_MAD_SUCCESS:
4543	tgt_dbg(tgt, "ADISC succeeded\n");
4544	if (ibmvfc_adisc_needs_plogi(mad, tgt))
4545	ibmvfc_del_tgt(tgt);
4546	break;
4547	case IBMVFC_MAD_DRIVER_FAILED:
4548	break;
4549	case IBMVFC_MAD_FAILED:
4550	default:
4551	ibmvfc_del_tgt(tgt);
4552	fc_reason = (be32_to_cpu(mad->fc_iu.response[1]) & 0x00ff0000) >> 16;
4553	fc_explain = (be32_to_cpu(mad->fc_iu.response[1]) & 0x0000ff00) >> 8;
4554	tgt_info(tgt, "ADISC failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4555	ibmvfc_get_cmd_error(be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error)),
4556	be16_to_cpu(mad->iu.status), be16_to_cpu(mad->iu.error),
4557	ibmvfc_get_fc_type(fc_reason), fc_reason,
4558	ibmvfc_get_ls_explain(fc_explain), fc_explain, status);
4559	break;
4560	}
4561
4562	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4563	ibmvfc_free_event(evt);
4564	wake_up(&vhost->work_wait_q);
4565	}
4566
4567	/**
4568	* ibmvfc_init_passthru - Initialize an event struct for FC passthru
4569	* @evt: ibmvfc event struct
4570	*
4571	**/
4572	static void ibmvfc_init_passthru(struct ibmvfc_event *evt)
4573	{
4574	struct ibmvfc_passthru_mad *mad = &evt->iu.passthru;
4575
4576	memset(mad, 0, sizeof(*mad));
4577	mad->common.version = cpu_to_be32(1);
4578	mad->common.opcode = cpu_to_be32(IBMVFC_PASSTHRU);
4579	mad->common.length = cpu_to_be16(sizeof(*mad) - sizeof(mad->fc_iu) - sizeof(mad->iu));
4580	mad->cmd_ioba.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4581	offsetof(struct ibmvfc_passthru_mad, iu));
4582	mad->cmd_ioba.len = cpu_to_be32(sizeof(mad->iu));
4583	mad->iu.cmd_len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4584	mad->iu.rsp_len = cpu_to_be32(sizeof(mad->fc_iu.response));
4585	mad->iu.cmd.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4586	offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4587	offsetof(struct ibmvfc_passthru_fc_iu, payload));
4588	mad->iu.cmd.len = cpu_to_be32(sizeof(mad->fc_iu.payload));
4589	mad->iu.rsp.va = cpu_to_be64((u64)be64_to_cpu(evt->crq.ioba) +
4590	offsetof(struct ibmvfc_passthru_mad, fc_iu) +
4591	offsetof(struct ibmvfc_passthru_fc_iu, response));
4592	mad->iu.rsp.len = cpu_to_be32(sizeof(mad->fc_iu.response));
4593	}
4594
4595	/**
4596	* ibmvfc_tgt_adisc_cancel_done - Completion handler when cancelling an ADISC
4597	* @evt: ibmvfc event struct
4598	*
4599	* Just cleanup this event struct. Everything else is handled by
4600	* the ADISC completion handler. If the ADISC never actually comes
4601	* back, we still have the timer running on the ADISC event struct
4602	* which will fire and cause the CRQ to get reset.
4603	*
4604	**/
4605	static void ibmvfc_tgt_adisc_cancel_done(struct ibmvfc_event *evt)
4606	{
4607	struct ibmvfc_host *vhost = evt->vhost;
4608	struct ibmvfc_target *tgt = evt->tgt;
4609
4610	tgt_dbg(tgt, "ADISC cancel complete\n");
4611	vhost->abort_threads--;
4612	ibmvfc_free_event(evt);
4613	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4614	wake_up(&vhost->work_wait_q);
4615	}
4616
4617	/**
4618	* ibmvfc_adisc_timeout - Handle an ADISC timeout
4619	* @t: ibmvfc target struct
4620	*
4621	* If an ADISC times out, send a cancel. If the cancel times
4622	* out, reset the CRQ. When the ADISC comes back as cancelled,
4623	* log back into the target.
4624	**/
4625	static void ibmvfc_adisc_timeout(struct timer_list *t)
4626	{
4627	struct ibmvfc_target *tgt = from_timer(tgt, t, timer);
4628	struct ibmvfc_host *vhost = tgt->vhost;
4629	struct ibmvfc_event *evt;
4630	struct ibmvfc_tmf *tmf;
4631	unsigned long flags;
4632	int rc;
4633
4634	tgt_dbg(tgt, "ADISC timeout\n");
4635	spin_lock_irqsave(vhost->host->host_lock, flags);
4636	if (vhost->abort_threads >= disc_threads ||
4637	tgt->action != IBMVFC_TGT_ACTION_INIT_WAIT ||
4638	vhost->state != IBMVFC_INITIALIZING ||
4639	vhost->action != IBMVFC_HOST_ACTION_QUERY_TGTS) {
4640	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
4641	return;
4642	}
4643
4644	vhost->abort_threads++;
4645	kref_get(kref: &tgt->kref);
4646	evt = ibmvfc_get_reserved_event(&vhost->crq);
4647	if (!evt) {
4648	tgt_err(tgt, "Failed to get cancel event for ADISC.\n");
4649	vhost->abort_threads--;
4650	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4651	__ibmvfc_reset_host(vhost);
4652	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
4653	return;
4654	}
4655	ibmvfc_init_event(evt, done: ibmvfc_tgt_adisc_cancel_done, format: IBMVFC_MAD_FORMAT);
4656
4657	evt->tgt = tgt;
4658	tmf = &evt->iu.tmf;
4659	memset(tmf, 0, sizeof(*tmf));
4660	if (ibmvfc_check_caps(vhost, IBMVFC_HANDLE_VF_WWPN)) {
4661	tmf->common.version = cpu_to_be32(2);
4662	tmf->target_wwpn = cpu_to_be64(tgt->wwpn);
4663	} else {
4664	tmf->common.version = cpu_to_be32(1);
4665	}
4666	tmf->common.opcode = cpu_to_be32(IBMVFC_TMF_MAD);
4667	tmf->common.length = cpu_to_be16(sizeof(*tmf));
4668	tmf->scsi_id = cpu_to_be64(tgt->scsi_id);
4669	tmf->cancel_key = cpu_to_be32(tgt->cancel_key);
4670
4671	rc = ibmvfc_send_event(evt, vhost, timeout: default_timeout);
4672
4673	if (rc) {
4674	tgt_err(tgt, "Failed to send cancel event for ADISC. rc=%d\n", rc);
4675	vhost->abort_threads--;
4676	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4677	__ibmvfc_reset_host(vhost);
4678	} else
4679	tgt_dbg(tgt, "Attempting to cancel ADISC\n");
4680	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
4681	}
4682
4683	/**
4684	* ibmvfc_tgt_adisc - Initiate an ADISC for specified target
4685	* @tgt: ibmvfc target struct
4686	*
4687	* When sending an ADISC we end up with two timers running. The
4688	* first timer is the timer in the ibmvfc target struct. If this
4689	* fires, we send a cancel to the target. The second timer is the
4690	* timer on the ibmvfc event for the ADISC, which is longer. If that
4691	* fires, it means the ADISC timed out and our attempt to cancel it
4692	* also failed, so we need to reset the CRQ.
4693	**/
4694	static void ibmvfc_tgt_adisc(struct ibmvfc_target *tgt)
4695	{
4696	struct ibmvfc_passthru_mad *mad;
4697	struct ibmvfc_host *vhost = tgt->vhost;
4698	struct ibmvfc_event *evt;
4699
4700	if (vhost->discovery_threads >= disc_threads)
4701	return;
4702
4703	kref_get(kref: &tgt->kref);
4704	evt = ibmvfc_get_reserved_event(&vhost->crq);
4705	if (!evt) {
4706	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4707	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4708	__ibmvfc_reset_host(vhost);
4709	return;
4710	}
4711	vhost->discovery_threads++;
4712	ibmvfc_init_event(evt, done: ibmvfc_tgt_adisc_done, format: IBMVFC_MAD_FORMAT);
4713	evt->tgt = tgt;
4714
4715	ibmvfc_init_passthru(evt);
4716	mad = &evt->iu.passthru;
4717	mad->iu.flags = cpu_to_be32(IBMVFC_FC_ELS);
4718	mad->iu.scsi_id = cpu_to_be64(tgt->scsi_id);
4719	mad->iu.cancel_key = cpu_to_be32(tgt->cancel_key);
4720
4721	mad->fc_iu.payload[0] = cpu_to_be32(IBMVFC_ADISC);
4722	memcpy(&mad->fc_iu.payload[2], &vhost->login_buf->resp.port_name,
4723	sizeof(vhost->login_buf->resp.port_name));
4724	memcpy(&mad->fc_iu.payload[4], &vhost->login_buf->resp.node_name,
4725	sizeof(vhost->login_buf->resp.node_name));
4726	mad->fc_iu.payload[6] = cpu_to_be32(be64_to_cpu(vhost->login_buf->resp.scsi_id) & 0x00ffffff);
4727
4728	if (timer_pending(timer: &tgt->timer))
4729	mod_timer(timer: &tgt->timer, expires: jiffies + (IBMVFC_ADISC_TIMEOUT * HZ));
4730	else {
4731	tgt->timer.expires = jiffies + (IBMVFC_ADISC_TIMEOUT * HZ);
4732	add_timer(timer: &tgt->timer);
4733	}
4734
4735	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT_WAIT);
4736	if (ibmvfc_send_event(evt, vhost, IBMVFC_ADISC_PLUS_CANCEL_TIMEOUT)) {
4737	vhost->discovery_threads--;
4738	del_timer(timer: &tgt->timer);
4739	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4740	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4741	} else
4742	tgt_dbg(tgt, "Sent ADISC\n");
4743	}
4744
4745	/**
4746	* ibmvfc_tgt_query_target_done - Completion handler for Query Target MAD
4747	* @evt: ibmvfc event struct
4748	*
4749	**/
4750	static void ibmvfc_tgt_query_target_done(struct ibmvfc_event *evt)
4751	{
4752	struct ibmvfc_target *tgt = evt->tgt;
4753	struct ibmvfc_host *vhost = evt->vhost;
4754	struct ibmvfc_query_tgt *rsp = &evt->xfer_iu->query_tgt;
4755	u32 status = be16_to_cpu(rsp->common.status);
4756	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4757
4758	vhost->discovery_threads--;
4759	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4760	switch (status) {
4761	case IBMVFC_MAD_SUCCESS:
4762	tgt_dbg(tgt, "Query Target succeeded\n");
4763	if (be64_to_cpu(rsp->scsi_id) != tgt->scsi_id)
4764	ibmvfc_del_tgt(tgt);
4765	else
4766	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_adisc);
4767	break;
4768	case IBMVFC_MAD_DRIVER_FAILED:
4769	break;
4770	case IBMVFC_MAD_CRQ_ERROR:
4771	ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_query_target);
4772	break;
4773	case IBMVFC_MAD_FAILED:
4774	default:
4775	if ((be16_to_cpu(rsp->status) & IBMVFC_FABRIC_MAPPED) == IBMVFC_FABRIC_MAPPED &&
4776	be16_to_cpu(rsp->error) == IBMVFC_UNABLE_TO_PERFORM_REQ &&
4777	be16_to_cpu(rsp->fc_explain) == IBMVFC_PORT_NAME_NOT_REG)
4778	ibmvfc_del_tgt(tgt);
4779	else if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
4780	level += ibmvfc_retry_tgt_init(tgt, job_step: ibmvfc_tgt_query_target);
4781	else
4782	ibmvfc_del_tgt(tgt);
4783
4784	tgt_log(tgt, level, "Query Target failed: %s (%x:%x) %s (%x) %s (%x) rc=0x%02X\n",
4785	ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4786	be16_to_cpu(rsp->status), be16_to_cpu(rsp->error),
4787	ibmvfc_get_fc_type(be16_to_cpu(rsp->fc_type)), be16_to_cpu(rsp->fc_type),
4788	ibmvfc_get_gs_explain(be16_to_cpu(rsp->fc_explain)), be16_to_cpu(rsp->fc_explain),
4789	status);
4790	break;
4791	}
4792
4793	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4794	ibmvfc_free_event(evt);
4795	wake_up(&vhost->work_wait_q);
4796	}
4797
4798	/**
4799	* ibmvfc_tgt_query_target - Initiate a Query Target for specified target
4800	* @tgt: ibmvfc target struct
4801	*
4802	**/
4803	static void ibmvfc_tgt_query_target(struct ibmvfc_target *tgt)
4804	{
4805	struct ibmvfc_query_tgt *query_tgt;
4806	struct ibmvfc_host *vhost = tgt->vhost;
4807	struct ibmvfc_event *evt;
4808
4809	if (vhost->discovery_threads >= disc_threads)
4810	return;
4811
4812	kref_get(kref: &tgt->kref);
4813	evt = ibmvfc_get_reserved_event(&vhost->crq);
4814	if (!evt) {
4815	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4816	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4817	__ibmvfc_reset_host(vhost);
4818	return;
4819	}
4820	vhost->discovery_threads++;
4821	evt->tgt = tgt;
4822	ibmvfc_init_event(evt, done: ibmvfc_tgt_query_target_done, format: IBMVFC_MAD_FORMAT);
4823	query_tgt = &evt->iu.query_tgt;
4824	memset(query_tgt, 0, sizeof(*query_tgt));
4825	query_tgt->common.version = cpu_to_be32(1);
4826	query_tgt->common.opcode = cpu_to_be32(IBMVFC_QUERY_TARGET);
4827	query_tgt->common.length = cpu_to_be16(sizeof(*query_tgt));
4828	query_tgt->wwpn = cpu_to_be64(tgt->ids.port_name);
4829
4830	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_INIT_WAIT);
4831	if (ibmvfc_send_event(evt, vhost, timeout: default_timeout)) {
4832	vhost->discovery_threads--;
4833	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_NONE);
4834	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
4835	} else
4836	tgt_dbg(tgt, "Sent Query Target\n");
4837	}
4838
4839	/**
4840	* ibmvfc_alloc_target - Allocate and initialize an ibmvfc target
4841	* @vhost: ibmvfc host struct
4842	* @target: Holds SCSI ID to allocate target forand the WWPN
4843	*
4844	* Returns:
4845	* 0 on success / other on failure
4846	**/
4847	static int ibmvfc_alloc_target(struct ibmvfc_host *vhost,
4848	struct ibmvfc_discover_targets_entry *target)
4849	{
4850	struct ibmvfc_target *stgt = NULL;
4851	struct ibmvfc_target *wtgt = NULL;
4852	struct ibmvfc_target *tgt;
4853	unsigned long flags;
4854	u64 scsi_id = be32_to_cpu(target->scsi_id) & IBMVFC_DISC_TGT_SCSI_ID_MASK;
4855	u64 wwpn = be64_to_cpu(target->wwpn);
4856
4857	/* Look to see if we already have a target allocated for this SCSI ID or WWPN */
4858	spin_lock_irqsave(vhost->host->host_lock, flags);
4859	list_for_each_entry(tgt, &vhost->targets, queue) {
4860	if (tgt->wwpn == wwpn) {
4861	wtgt = tgt;
4862	break;
4863	}
4864	}
4865
4866	list_for_each_entry(tgt, &vhost->targets, queue) {
4867	if (tgt->scsi_id == scsi_id) {
4868	stgt = tgt;
4869	break;
4870	}
4871	}
4872
4873	if (wtgt && !stgt) {
4874	/*
4875	* A WWPN target has moved and we still are tracking the old
4876	* SCSI ID. The only way we should be able to get here is if
4877	* we attempted to send an implicit logout for the old SCSI ID
4878	* and it failed for some reason, such as there being I/O
4879	* pending to the target. In this case, we will have already
4880	* deleted the rport from the FC transport so we do a move
4881	* login, which works even with I/O pending, however, if
4882	* there is still I/O pending, it will stay outstanding, so
4883	* we only do this if fast fail is disabled for the rport,
4884	* otherwise we let terminate_rport_io clean up the port
4885	* before we login at the new location.
4886	*/
4887	if (wtgt->action == IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT) {
4888	if (wtgt->move_login) {
4889	/*
4890	* Do a move login here. The old target is no longer
4891	* known to the transport layer We don't use the
4892	* normal ibmvfc_set_tgt_action to set this, as we
4893	* don't normally want to allow this state change.
4894	*/
4895	wtgt->new_scsi_id = scsi_id;
4896	wtgt->action = IBMVFC_TGT_ACTION_INIT;
4897	wtgt->init_retries = 0;
4898	ibmvfc_init_tgt(tgt: wtgt, job_step: ibmvfc_tgt_move_login);
4899	}
4900	goto unlock_out;
4901	} else {
4902	tgt_err(wtgt, "Unexpected target state: %d, %p\n",
4903	wtgt->action, wtgt->rport);
4904	}
4905	} else if (stgt) {
4906	if (tgt->need_login)
4907	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_implicit_logout);
4908	goto unlock_out;
4909	}
4910	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
4911
4912	tgt = mempool_alloc(pool: vhost->tgt_pool, GFP_NOIO);
4913	memset(tgt, 0, sizeof(*tgt));
4914	tgt->scsi_id = scsi_id;
4915	tgt->wwpn = wwpn;
4916	tgt->vhost = vhost;
4917	tgt->need_login = 1;
4918	timer_setup(&tgt->timer, ibmvfc_adisc_timeout, 0);
4919	kref_init(kref: &tgt->kref);
4920	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_implicit_logout);
4921	spin_lock_irqsave(vhost->host->host_lock, flags);
4922	tgt->cancel_key = vhost->task_set++;
4923	list_add_tail(new: &tgt->queue, head: &vhost->targets);
4924
4925	unlock_out:
4926	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
4927	return 0;
4928	}
4929
4930	/**
4931	* ibmvfc_alloc_targets - Allocate and initialize ibmvfc targets
4932	* @vhost: ibmvfc host struct
4933	*
4934	* Returns:
4935	* 0 on success / other on failure
4936	**/
4937	static int ibmvfc_alloc_targets(struct ibmvfc_host *vhost)
4938	{
4939	int i, rc;
4940
4941	for (i = 0, rc = 0; !rc && i < vhost->num_targets; i++)
4942	rc = ibmvfc_alloc_target(vhost, target: &vhost->scsi_scrqs.disc_buf[i]);
4943
4944	return rc;
4945	}
4946
4947	/**
4948	* ibmvfc_discover_targets_done - Completion handler for discover targets MAD
4949	* @evt: ibmvfc event struct
4950	*
4951	**/
4952	static void ibmvfc_discover_targets_done(struct ibmvfc_event *evt)
4953	{
4954	struct ibmvfc_host *vhost = evt->vhost;
4955	struct ibmvfc_discover_targets *rsp = &evt->xfer_iu->discover_targets;
4956	u32 mad_status = be16_to_cpu(rsp->common.status);
4957	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4958
4959	switch (mad_status) {
4960	case IBMVFC_MAD_SUCCESS:
4961	ibmvfc_dbg(vhost, "Discover Targets succeeded\n");
4962	vhost->num_targets = be32_to_cpu(rsp->num_written);
4963	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_ALLOC_TGTS);
4964	break;
4965	case IBMVFC_MAD_FAILED:
4966	level += ibmvfc_retry_host_init(vhost);
4967	ibmvfc_log(vhost, level, "Discover Targets failed: %s (%x:%x)\n",
4968	ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
4969	be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
4970	break;
4971	case IBMVFC_MAD_DRIVER_FAILED:
4972	break;
4973	default:
4974	dev_err(vhost->dev, "Invalid Discover Targets response: 0x%x\n", mad_status);
4975	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
4976	break;
4977	}
4978
4979	ibmvfc_free_event(evt);
4980	wake_up(&vhost->work_wait_q);
4981	}
4982
4983	/**
4984	* ibmvfc_discover_targets - Send Discover Targets MAD
4985	* @vhost: ibmvfc host struct
4986	*
4987	**/
4988	static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
4989	{
4990	struct ibmvfc_discover_targets *mad;
4991	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
4992	int level = IBMVFC_DEFAULT_LOG_LEVEL;
4993
4994	if (!evt) {
4995	ibmvfc_log(vhost, level, "Discover Targets failed: no available events\n");
4996	ibmvfc_hard_reset_host(vhost);
4997	return;
4998	}
4999
5000	ibmvfc_init_event(evt, done: ibmvfc_discover_targets_done, format: IBMVFC_MAD_FORMAT);
5001	mad = &evt->iu.discover_targets;
5002	memset(mad, 0, sizeof(*mad));
5003	mad->common.version = cpu_to_be32(1);
5004	mad->common.opcode = cpu_to_be32(IBMVFC_DISC_TARGETS);
5005	mad->common.length = cpu_to_be16(sizeof(*mad));
5006	mad->bufflen = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5007	mad->buffer.va = cpu_to_be64(vhost->scsi_scrqs.disc_buf_dma);
5008	mad->buffer.len = cpu_to_be32(vhost->scsi_scrqs.disc_buf_sz);
5009	mad->flags = cpu_to_be32(IBMVFC_DISC_TGT_PORT_ID_WWPN_LIST);
5010	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT_WAIT);
5011
5012	if (!ibmvfc_send_event(evt, vhost, timeout: default_timeout))
5013	ibmvfc_dbg(vhost, "Sent discover targets\n");
5014	else
5015	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5016	}
5017
5018	static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
5019	{
5020	struct ibmvfc_host *vhost = evt->vhost;
5021	struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
5022	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5023	u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
5024	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5025	int flags, active_queues, i;
5026
5027	ibmvfc_free_event(evt);
5028
5029	switch (mad_status) {
5030	case IBMVFC_MAD_SUCCESS:
5031	ibmvfc_dbg(vhost, "Channel Setup succeeded\n");
5032	flags = be32_to_cpu(setup->flags);
5033	vhost->do_enquiry = 0;
5034	active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
5035	scrqs->active_queues = active_queues;
5036
5037	if (flags & IBMVFC_CHANNELS_CANCELED) {
5038	ibmvfc_dbg(vhost, "Channels Canceled\n");
5039	vhost->using_channels = 0;
5040	} else {
5041	if (active_queues)
5042	vhost->using_channels = 1;
5043	for (i = 0; i < active_queues; i++)
5044	scrqs->scrqs[i].vios_cookie =
5045	be64_to_cpu(setup->channel_handles[i]);
5046
5047	ibmvfc_dbg(vhost, "Using %u channels\n",
5048	vhost->scsi_scrqs.active_queues);
5049	}
5050	break;
5051	case IBMVFC_MAD_FAILED:
5052	level += ibmvfc_retry_host_init(vhost);
5053	ibmvfc_log(vhost, level, "Channel Setup failed\n");
5054	fallthrough;
5055	case IBMVFC_MAD_DRIVER_FAILED:
5056	return;
5057	default:
5058	dev_err(vhost->dev, "Invalid Channel Setup response: 0x%x\n",
5059	mad_status);
5060	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5061	return;
5062	}
5063
5064	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_QUERY);
5065	wake_up(&vhost->work_wait_q);
5066	}
5067
5068	static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
5069	{
5070	struct ibmvfc_channel_setup_mad *mad;
5071	struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
5072	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5073	struct ibmvfc_channels *scrqs = &vhost->scsi_scrqs;
5074	unsigned int num_channels =
5075	min(scrqs->desired_queues, vhost->max_vios_scsi_channels);
5076	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5077	int i;
5078
5079	if (!evt) {
5080	ibmvfc_log(vhost, level, "Channel Setup failed: no available events\n");
5081	ibmvfc_hard_reset_host(vhost);
5082	return;
5083	}
5084
5085	memset(setup_buf, 0, sizeof(*setup_buf));
5086	if (num_channels == 0)
5087	setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
5088	else {
5089	setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
5090	for (i = 0; i < num_channels; i++)
5091	setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
5092	}
5093
5094	ibmvfc_init_event(evt, done: ibmvfc_channel_setup_done, format: IBMVFC_MAD_FORMAT);
5095	mad = &evt->iu.channel_setup;
5096	memset(mad, 0, sizeof(*mad));
5097	mad->common.version = cpu_to_be32(1);
5098	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_SETUP);
5099	mad->common.length = cpu_to_be16(sizeof(*mad));
5100	mad->buffer.va = cpu_to_be64(vhost->channel_setup_dma);
5101	mad->buffer.len = cpu_to_be32(sizeof(*vhost->channel_setup_buf));
5102
5103	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT_WAIT);
5104
5105	if (!ibmvfc_send_event(evt, vhost, timeout: default_timeout))
5106	ibmvfc_dbg(vhost, "Sent channel setup\n");
5107	else
5108	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DOWN);
5109	}
5110
5111	static void ibmvfc_channel_enquiry_done(struct ibmvfc_event *evt)
5112	{
5113	struct ibmvfc_host *vhost = evt->vhost;
5114	struct ibmvfc_channel_enquiry *rsp = &evt->xfer_iu->channel_enquiry;
5115	u32 mad_status = be16_to_cpu(rsp->common.status);
5116	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5117
5118	switch (mad_status) {
5119	case IBMVFC_MAD_SUCCESS:
5120	ibmvfc_dbg(vhost, "Channel Enquiry succeeded\n");
5121	vhost->max_vios_scsi_channels = be32_to_cpu(rsp->num_scsi_subq_channels);
5122	ibmvfc_free_event(evt);
5123	break;
5124	case IBMVFC_MAD_FAILED:
5125	level += ibmvfc_retry_host_init(vhost);
5126	ibmvfc_log(vhost, level, "Channel Enquiry failed\n");
5127	fallthrough;
5128	case IBMVFC_MAD_DRIVER_FAILED:
5129	ibmvfc_free_event(evt);
5130	return;
5131	default:
5132	dev_err(vhost->dev, "Invalid Channel Enquiry response: 0x%x\n",
5133	mad_status);
5134	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5135	ibmvfc_free_event(evt);
5136	return;
5137	}
5138
5139	ibmvfc_channel_setup(vhost);
5140	}
5141
5142	static void ibmvfc_channel_enquiry(struct ibmvfc_host *vhost)
5143	{
5144	struct ibmvfc_channel_enquiry *mad;
5145	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5146	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5147
5148	if (!evt) {
5149	ibmvfc_log(vhost, level, "Channel Enquiry failed: no available events\n");
5150	ibmvfc_hard_reset_host(vhost);
5151	return;
5152	}
5153
5154	ibmvfc_init_event(evt, done: ibmvfc_channel_enquiry_done, format: IBMVFC_MAD_FORMAT);
5155	mad = &evt->iu.channel_enquiry;
5156	memset(mad, 0, sizeof(*mad));
5157	mad->common.version = cpu_to_be32(1);
5158	mad->common.opcode = cpu_to_be32(IBMVFC_CHANNEL_ENQUIRY);
5159	mad->common.length = cpu_to_be16(sizeof(*mad));
5160
5161	if (mig_channels_only)
5162	mad->flags |= cpu_to_be32(IBMVFC_NO_CHANNELS_TO_CRQ_SUPPORT);
5163	if (mig_no_less_channels)
5164	mad->flags |= cpu_to_be32(IBMVFC_NO_N_TO_M_CHANNELS_SUPPORT);
5165
5166	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT_WAIT);
5167
5168	if (!ibmvfc_send_event(evt, vhost, timeout: default_timeout))
5169	ibmvfc_dbg(vhost, "Send channel enquiry\n");
5170	else
5171	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5172	}
5173
5174	/**
5175	* ibmvfc_npiv_login_done - Completion handler for NPIV Login
5176	* @evt: ibmvfc event struct
5177	*
5178	**/
5179	static void ibmvfc_npiv_login_done(struct ibmvfc_event *evt)
5180	{
5181	struct ibmvfc_host *vhost = evt->vhost;
5182	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_login.common.status);
5183	struct ibmvfc_npiv_login_resp *rsp = &vhost->login_buf->resp;
5184	unsigned int npiv_max_sectors;
5185	int level = IBMVFC_DEFAULT_LOG_LEVEL;
5186
5187	switch (mad_status) {
5188	case IBMVFC_MAD_SUCCESS:
5189	ibmvfc_free_event(evt);
5190	break;
5191	case IBMVFC_MAD_FAILED:
5192	if (ibmvfc_retry_cmd(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)))
5193	level += ibmvfc_retry_host_init(vhost);
5194	else
5195	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5196	ibmvfc_log(vhost, level, "NPIV Login failed: %s (%x:%x)\n",
5197	ibmvfc_get_cmd_error(be16_to_cpu(rsp->status), be16_to_cpu(rsp->error)),
5198	be16_to_cpu(rsp->status), be16_to_cpu(rsp->error));
5199	ibmvfc_free_event(evt);
5200	return;
5201	case IBMVFC_MAD_CRQ_ERROR:
5202	ibmvfc_retry_host_init(vhost);
5203	fallthrough;
5204	case IBMVFC_MAD_DRIVER_FAILED:
5205	ibmvfc_free_event(evt);
5206	return;
5207	default:
5208	dev_err(vhost->dev, "Invalid NPIV Login response: 0x%x\n", mad_status);
5209	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5210	ibmvfc_free_event(evt);
5211	return;
5212	}
5213
5214	vhost->client_migrated = 0;
5215
5216	if (!(be32_to_cpu(rsp->flags) & IBMVFC_NATIVE_FC)) {
5217	dev_err(vhost->dev, "Virtual adapter does not support FC. %x\n",
5218	rsp->flags);
5219	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5220	wake_up(&vhost->work_wait_q);
5221	return;
5222	}
5223
5224	if (be32_to_cpu(rsp->max_cmds) <= IBMVFC_NUM_INTERNAL_REQ) {
5225	dev_err(vhost->dev, "Virtual adapter supported queue depth too small: %d\n",
5226	rsp->max_cmds);
5227	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5228	wake_up(&vhost->work_wait_q);
5229	return;
5230	}
5231
5232	vhost->logged_in = 1;
5233	npiv_max_sectors = min((uint)(be64_to_cpu(rsp->max_dma_len) >> 9), IBMVFC_MAX_SECTORS);
5234	dev_info(vhost->dev, "Host partition: %s, device: %s %s %s max sectors %u\n",
5235	rsp->partition_name, rsp->device_name, rsp->port_loc_code,
5236	rsp->drc_name, npiv_max_sectors);
5237
5238	fc_host_fabric_name(vhost->host) = be64_to_cpu(rsp->node_name);
5239	fc_host_node_name(vhost->host) = be64_to_cpu(rsp->node_name);
5240	fc_host_port_name(vhost->host) = be64_to_cpu(rsp->port_name);
5241	fc_host_port_id(vhost->host) = be64_to_cpu(rsp->scsi_id);
5242	fc_host_port_type(vhost->host) = FC_PORTTYPE_NPIV;
5243	fc_host_supported_classes(vhost->host) = 0;
5244	if (be32_to_cpu(rsp->service_parms.class1_parms[0]) & 0x80000000)
5245	fc_host_supported_classes(vhost->host) |= FC_COS_CLASS1;
5246	if (be32_to_cpu(rsp->service_parms.class2_parms[0]) & 0x80000000)
5247	fc_host_supported_classes(vhost->host) |= FC_COS_CLASS2;
5248	if (be32_to_cpu(rsp->service_parms.class3_parms[0]) & 0x80000000)
5249	fc_host_supported_classes(vhost->host) |= FC_COS_CLASS3;
5250	fc_host_maxframe_size(vhost->host) =
5251	be16_to_cpu(rsp->service_parms.common.bb_rcv_sz) & 0x0fff;
5252
5253	vhost->host->can_queue = be32_to_cpu(rsp->max_cmds) - IBMVFC_NUM_INTERNAL_REQ;
5254	vhost->host->max_sectors = npiv_max_sectors;
5255
5256	if (ibmvfc_check_caps(vhost, IBMVFC_CAN_SUPPORT_CHANNELS) && vhost->do_enquiry) {
5257	ibmvfc_channel_enquiry(vhost);
5258	} else {
5259	vhost->do_enquiry = 0;
5260	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_QUERY);
5261	wake_up(&vhost->work_wait_q);
5262	}
5263	}
5264
5265	/**
5266	* ibmvfc_npiv_login - Sends NPIV login
5267	* @vhost: ibmvfc host struct
5268	*
5269	**/
5270	static void ibmvfc_npiv_login(struct ibmvfc_host *vhost)
5271	{
5272	struct ibmvfc_npiv_login_mad *mad;
5273	struct ibmvfc_event *evt = ibmvfc_get_reserved_event(&vhost->crq);
5274
5275	if (!evt) {
5276	ibmvfc_dbg(vhost, "NPIV Login failed: no available events\n");
5277	ibmvfc_hard_reset_host(vhost);
5278	return;
5279	}
5280
5281	ibmvfc_gather_partition_info(vhost);
5282	ibmvfc_set_login_info(vhost);
5283	ibmvfc_init_event(evt, done: ibmvfc_npiv_login_done, format: IBMVFC_MAD_FORMAT);
5284
5285	memcpy(vhost->login_buf, &vhost->login_info, sizeof(vhost->login_info));
5286	mad = &evt->iu.npiv_login;
5287	memset(mad, 0, sizeof(struct ibmvfc_npiv_login_mad));
5288	mad->common.version = cpu_to_be32(1);
5289	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGIN);
5290	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_login_mad));
5291	mad->buffer.va = cpu_to_be64(vhost->login_buf_dma);
5292	mad->buffer.len = cpu_to_be32(sizeof(*vhost->login_buf));
5293
5294	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT_WAIT);
5295
5296	if (!ibmvfc_send_event(evt, vhost, timeout: default_timeout))
5297	ibmvfc_dbg(vhost, "Sent NPIV login\n");
5298	else
5299	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5300	}
5301
5302	/**
5303	* ibmvfc_npiv_logout_done - Completion handler for NPIV Logout
5304	* @evt: ibmvfc event struct
5305	*
5306	**/
5307	static void ibmvfc_npiv_logout_done(struct ibmvfc_event *evt)
5308	{
5309	struct ibmvfc_host *vhost = evt->vhost;
5310	u32 mad_status = be16_to_cpu(evt->xfer_iu->npiv_logout.common.status);
5311
5312	ibmvfc_free_event(evt);
5313
5314	switch (mad_status) {
5315	case IBMVFC_MAD_SUCCESS:
5316	if (list_empty(head: &vhost->crq.sent) &&
5317	vhost->action == IBMVFC_HOST_ACTION_LOGO_WAIT) {
5318	ibmvfc_init_host(vhost);
5319	return;
5320	}
5321	break;
5322	case IBMVFC_MAD_FAILED:
5323	case IBMVFC_MAD_NOT_SUPPORTED:
5324	case IBMVFC_MAD_CRQ_ERROR:
5325	case IBMVFC_MAD_DRIVER_FAILED:
5326	default:
5327	ibmvfc_dbg(vhost, "NPIV Logout failed. 0x%X\n", mad_status);
5328	break;
5329	}
5330
5331	ibmvfc_hard_reset_host(vhost);
5332	}
5333
5334	/**
5335	* ibmvfc_npiv_logout - Issue an NPIV Logout
5336	* @vhost: ibmvfc host struct
5337	*
5338	**/
5339	static void ibmvfc_npiv_logout(struct ibmvfc_host *vhost)
5340	{
5341	struct ibmvfc_npiv_logout_mad *mad;
5342	struct ibmvfc_event *evt;
5343
5344	evt = ibmvfc_get_reserved_event(&vhost->crq);
5345	if (!evt) {
5346	ibmvfc_dbg(vhost, "NPIV Logout failed: no available events\n");
5347	ibmvfc_hard_reset_host(vhost);
5348	return;
5349	}
5350
5351	ibmvfc_init_event(evt, done: ibmvfc_npiv_logout_done, format: IBMVFC_MAD_FORMAT);
5352
5353	mad = &evt->iu.npiv_logout;
5354	memset(mad, 0, sizeof(*mad));
5355	mad->common.version = cpu_to_be32(1);
5356	mad->common.opcode = cpu_to_be32(IBMVFC_NPIV_LOGOUT);
5357	mad->common.length = cpu_to_be16(sizeof(struct ibmvfc_npiv_logout_mad));
5358
5359	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_LOGO_WAIT);
5360
5361	if (!ibmvfc_send_event(evt, vhost, timeout: default_timeout))
5362	ibmvfc_dbg(vhost, "Sent NPIV logout\n");
5363	else
5364	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5365	}
5366
5367	/**
5368	* ibmvfc_dev_init_to_do - Is there target initialization work to do?
5369	* @vhost: ibmvfc host struct
5370	*
5371	* Returns:
5372	* 1 if work to do / 0 if not
5373	**/
5374	static int ibmvfc_dev_init_to_do(struct ibmvfc_host *vhost)
5375	{
5376	struct ibmvfc_target *tgt;
5377
5378	list_for_each_entry(tgt, &vhost->targets, queue) {
5379	if (tgt->action == IBMVFC_TGT_ACTION_INIT ||
5380	tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5381	return 1;
5382	}
5383
5384	return 0;
5385	}
5386
5387	/**
5388	* ibmvfc_dev_logo_to_do - Is there target logout work to do?
5389	* @vhost: ibmvfc host struct
5390	*
5391	* Returns:
5392	* 1 if work to do / 0 if not
5393	**/
5394	static int ibmvfc_dev_logo_to_do(struct ibmvfc_host *vhost)
5395	{
5396	struct ibmvfc_target *tgt;
5397
5398	list_for_each_entry(tgt, &vhost->targets, queue) {
5399	if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT ||
5400	tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5401	return 1;
5402	}
5403	return 0;
5404	}
5405
5406	/**
5407	* __ibmvfc_work_to_do - Is there task level work to do? (no locking)
5408	* @vhost: ibmvfc host struct
5409	*
5410	* Returns:
5411	* 1 if work to do / 0 if not
5412	**/
5413	static int __ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5414	{
5415	struct ibmvfc_target *tgt;
5416
5417	if (kthread_should_stop())
5418	return 1;
5419	switch (vhost->action) {
5420	case IBMVFC_HOST_ACTION_NONE:
5421	case IBMVFC_HOST_ACTION_INIT_WAIT:
5422	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5423	return 0;
5424	case IBMVFC_HOST_ACTION_TGT_INIT:
5425	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5426	if (vhost->discovery_threads == disc_threads)
5427	return 0;
5428	list_for_each_entry(tgt, &vhost->targets, queue)
5429	if (tgt->action == IBMVFC_TGT_ACTION_INIT)
5430	return 1;
5431	list_for_each_entry(tgt, &vhost->targets, queue)
5432	if (tgt->action == IBMVFC_TGT_ACTION_INIT_WAIT)
5433	return 0;
5434	return 1;
5435	case IBMVFC_HOST_ACTION_TGT_DEL:
5436	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5437	if (vhost->discovery_threads == disc_threads)
5438	return 0;
5439	list_for_each_entry(tgt, &vhost->targets, queue)
5440	if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT)
5441	return 1;
5442	list_for_each_entry(tgt, &vhost->targets, queue)
5443	if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT_WAIT)
5444	return 0;
5445	return 1;
5446	case IBMVFC_HOST_ACTION_LOGO:
5447	case IBMVFC_HOST_ACTION_INIT:
5448	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5449	case IBMVFC_HOST_ACTION_QUERY:
5450	case IBMVFC_HOST_ACTION_RESET:
5451	case IBMVFC_HOST_ACTION_REENABLE:
5452	default:
5453	break;
5454	}
5455
5456	return 1;
5457	}
5458
5459	/**
5460	* ibmvfc_work_to_do - Is there task level work to do?
5461	* @vhost: ibmvfc host struct
5462	*
5463	* Returns:
5464	* 1 if work to do / 0 if not
5465	**/
5466	static int ibmvfc_work_to_do(struct ibmvfc_host *vhost)
5467	{
5468	unsigned long flags;
5469	int rc;
5470
5471	spin_lock_irqsave(vhost->host->host_lock, flags);
5472	rc = __ibmvfc_work_to_do(vhost);
5473	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5474	return rc;
5475	}
5476
5477	/**
5478	* ibmvfc_log_ae - Log async events if necessary
5479	* @vhost: ibmvfc host struct
5480	* @events: events to log
5481	*
5482	**/
5483	static void ibmvfc_log_ae(struct ibmvfc_host *vhost, int events)
5484	{
5485	if (events & IBMVFC_AE_RSCN)
5486	fc_host_post_event(shost: vhost->host, event_number: fc_get_event_number(), event_code: FCH_EVT_RSCN, event_data: 0);
5487	if ((events & IBMVFC_AE_LINKDOWN) &&
5488	vhost->state >= IBMVFC_HALTED)
5489	fc_host_post_event(shost: vhost->host, event_number: fc_get_event_number(), event_code: FCH_EVT_LINKDOWN, event_data: 0);
5490	if ((events & IBMVFC_AE_LINKUP) &&
5491	vhost->state == IBMVFC_INITIALIZING)
5492	fc_host_post_event(shost: vhost->host, event_number: fc_get_event_number(), event_code: FCH_EVT_LINKUP, event_data: 0);
5493	}
5494
5495	/**
5496	* ibmvfc_tgt_add_rport - Tell the FC transport about a new remote port
5497	* @tgt: ibmvfc target struct
5498	*
5499	**/
5500	static void ibmvfc_tgt_add_rport(struct ibmvfc_target *tgt)
5501	{
5502	struct ibmvfc_host *vhost = tgt->vhost;
5503	struct fc_rport *rport;
5504	unsigned long flags;
5505
5506	tgt_dbg(tgt, "Adding rport\n");
5507	rport = fc_remote_port_add(shost: vhost->host, channel: 0, ids: &tgt->ids);
5508	spin_lock_irqsave(vhost->host->host_lock, flags);
5509
5510	if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5511	tgt_dbg(tgt, "Deleting rport\n");
5512	list_del(entry: &tgt->queue);
5513	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DELETED_RPORT);
5514	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5515	fc_remote_port_delete(rport);
5516	del_timer_sync(timer: &tgt->timer);
5517	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
5518	return;
5519	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5520	tgt_dbg(tgt, "Deleting rport with outstanding I/O\n");
5521	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5522	tgt->rport = NULL;
5523	tgt->init_retries = 0;
5524	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5525	fc_remote_port_delete(rport);
5526	return;
5527	} else if (rport && tgt->action == IBMVFC_TGT_ACTION_DELETED_RPORT) {
5528	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5529	return;
5530	}
5531
5532	if (rport) {
5533	tgt_dbg(tgt, "rport add succeeded\n");
5534	tgt->rport = rport;
5535	rport->maxframe_size = be16_to_cpu(tgt->service_parms.common.bb_rcv_sz) & 0x0fff;
5536	rport->supported_classes = 0;
5537	tgt->target_id = rport->scsi_target_id;
5538	if (be32_to_cpu(tgt->service_parms.class1_parms[0]) & 0x80000000)
5539	rport->supported_classes |= FC_COS_CLASS1;
5540	if (be32_to_cpu(tgt->service_parms.class2_parms[0]) & 0x80000000)
5541	rport->supported_classes |= FC_COS_CLASS2;
5542	if (be32_to_cpu(tgt->service_parms.class3_parms[0]) & 0x80000000)
5543	rport->supported_classes |= FC_COS_CLASS3;
5544	if (rport->rqst_q)
5545	blk_queue_max_segments(rport->rqst_q, 1);
5546	} else
5547	tgt_dbg(tgt, "rport add failed\n");
5548	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5549	}
5550
5551	/**
5552	* ibmvfc_do_work - Do task level work
5553	* @vhost: ibmvfc host struct
5554	*
5555	**/
5556	static void ibmvfc_do_work(struct ibmvfc_host *vhost)
5557	{
5558	struct ibmvfc_target *tgt;
5559	unsigned long flags;
5560	struct fc_rport *rport;
5561	LIST_HEAD(purge);
5562	int rc;
5563
5564	ibmvfc_log_ae(vhost, events: vhost->events_to_log);
5565	spin_lock_irqsave(vhost->host->host_lock, flags);
5566	vhost->events_to_log = 0;
5567	switch (vhost->action) {
5568	case IBMVFC_HOST_ACTION_NONE:
5569	case IBMVFC_HOST_ACTION_LOGO_WAIT:
5570	case IBMVFC_HOST_ACTION_INIT_WAIT:
5571	break;
5572	case IBMVFC_HOST_ACTION_RESET:
5573	list_splice_init(list: &vhost->purge, head: &purge);
5574	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5575	ibmvfc_complete_purge(purge_list: &purge);
5576	rc = ibmvfc_reset_crq(vhost);
5577
5578	spin_lock_irqsave(vhost->host->host_lock, flags);
5579	if (!rc || rc == H_CLOSED)
5580	vio_enable_interrupts(to_vio_dev(vhost->dev));
5581	if (vhost->action == IBMVFC_HOST_ACTION_RESET) {
5582	/*
5583	* The only action we could have changed to would have
5584	* been reenable, in which case, we skip the rest of
5585	* this path and wait until we've done the re-enable
5586	* before sending the crq init.
5587	*/
5588	vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5589
5590	if (rc || (rc = ibmvfc_send_crq_init(vhost)) ||
5591	(rc = vio_enable_interrupts(to_vio_dev(vhost->dev)))) {
5592	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5593	dev_err(vhost->dev, "Error after reset (rc=%d)\n", rc);
5594	}
5595	}
5596	break;
5597	case IBMVFC_HOST_ACTION_REENABLE:
5598	list_splice_init(list: &vhost->purge, head: &purge);
5599	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5600	ibmvfc_complete_purge(purge_list: &purge);
5601	rc = ibmvfc_reenable_crq_queue(vhost);
5602
5603	spin_lock_irqsave(vhost->host->host_lock, flags);
5604	if (vhost->action == IBMVFC_HOST_ACTION_REENABLE) {
5605	/*
5606	* The only action we could have changed to would have
5607	* been reset, in which case, we skip the rest of this
5608	* path and wait until we've done the reset before
5609	* sending the crq init.
5610	*/
5611	vhost->action = IBMVFC_HOST_ACTION_TGT_DEL;
5612	if (rc || (rc = ibmvfc_send_crq_init(vhost))) {
5613	ibmvfc_link_down(vhost, state: IBMVFC_LINK_DEAD);
5614	dev_err(vhost->dev, "Error after enable (rc=%d)\n", rc);
5615	}
5616	}
5617	break;
5618	case IBMVFC_HOST_ACTION_LOGO:
5619	vhost->job_step(vhost);
5620	break;
5621	case IBMVFC_HOST_ACTION_INIT:
5622	BUG_ON(vhost->state != IBMVFC_INITIALIZING);
5623	if (vhost->delay_init) {
5624	vhost->delay_init = 0;
5625	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5626	ssleep(seconds: 15);
5627	return;
5628	} else
5629	vhost->job_step(vhost);
5630	break;
5631	case IBMVFC_HOST_ACTION_QUERY:
5632	list_for_each_entry(tgt, &vhost->targets, queue)
5633	ibmvfc_init_tgt(tgt, job_step: ibmvfc_tgt_query_target);
5634	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_QUERY_TGTS);
5635	break;
5636	case IBMVFC_HOST_ACTION_QUERY_TGTS:
5637	list_for_each_entry(tgt, &vhost->targets, queue) {
5638	if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5639	tgt->job_step(tgt);
5640	break;
5641	}
5642	}
5643
5644	if (!ibmvfc_dev_init_to_do(vhost))
5645	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_TGT_DEL);
5646	break;
5647	case IBMVFC_HOST_ACTION_TGT_DEL:
5648	case IBMVFC_HOST_ACTION_TGT_DEL_FAILED:
5649	list_for_each_entry(tgt, &vhost->targets, queue) {
5650	if (tgt->action == IBMVFC_TGT_ACTION_LOGOUT_RPORT) {
5651	tgt->job_step(tgt);
5652	break;
5653	}
5654	}
5655
5656	if (ibmvfc_dev_logo_to_do(vhost)) {
5657	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5658	return;
5659	}
5660
5661	list_for_each_entry(tgt, &vhost->targets, queue) {
5662	if (tgt->action == IBMVFC_TGT_ACTION_DEL_RPORT) {
5663	tgt_dbg(tgt, "Deleting rport\n");
5664	rport = tgt->rport;
5665	tgt->rport = NULL;
5666	list_del(entry: &tgt->queue);
5667	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_DELETED_RPORT);
5668	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5669	if (rport)
5670	fc_remote_port_delete(rport);
5671	del_timer_sync(timer: &tgt->timer);
5672	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
5673	return;
5674	} else if (tgt->action == IBMVFC_TGT_ACTION_DEL_AND_LOGOUT_RPORT) {
5675	tgt_dbg(tgt, "Deleting rport with I/O outstanding\n");
5676	rport = tgt->rport;
5677	tgt->rport = NULL;
5678	tgt->init_retries = 0;
5679	ibmvfc_set_tgt_action(tgt, action: IBMVFC_TGT_ACTION_LOGOUT_DELETED_RPORT);
5680
5681	/*
5682	* If fast fail is enabled, we wait for it to fire and then clean up
5683	* the old port, since we expect the fast fail timer to clean up the
5684	* outstanding I/O faster than waiting for normal command timeouts.
5685	* However, if fast fail is disabled, any I/O outstanding to the
5686	* rport LUNs will stay outstanding indefinitely, since the EH handlers
5687	* won't get invoked for I/O's timing out. If this is a NPIV failover
5688	* scenario, the better alternative is to use the move login.
5689	*/
5690	if (rport && rport->fast_io_fail_tmo == -1)
5691	tgt->move_login = 1;
5692	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5693	if (rport)
5694	fc_remote_port_delete(rport);
5695	return;
5696	}
5697	}
5698
5699	if (vhost->state == IBMVFC_INITIALIZING) {
5700	if (vhost->action == IBMVFC_HOST_ACTION_TGT_DEL_FAILED) {
5701	if (vhost->reinit) {
5702	vhost->reinit = 0;
5703	scsi_block_requests(vhost->host);
5704	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_QUERY);
5705	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5706	} else {
5707	ibmvfc_set_host_state(vhost, state: IBMVFC_ACTIVE);
5708	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_NONE);
5709	wake_up(&vhost->init_wait_q);
5710	schedule_work(work: &vhost->rport_add_work_q);
5711	vhost->init_retries = 0;
5712	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5713	scsi_unblock_requests(vhost->host);
5714	}
5715
5716	return;
5717	} else {
5718	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_INIT);
5719	vhost->job_step = ibmvfc_discover_targets;
5720	}
5721	} else {
5722	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_NONE);
5723	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5724	scsi_unblock_requests(vhost->host);
5725	wake_up(&vhost->init_wait_q);
5726	return;
5727	}
5728	break;
5729	case IBMVFC_HOST_ACTION_ALLOC_TGTS:
5730	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_TGT_INIT);
5731	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5732	ibmvfc_alloc_targets(vhost);
5733	spin_lock_irqsave(vhost->host->host_lock, flags);
5734	break;
5735	case IBMVFC_HOST_ACTION_TGT_INIT:
5736	list_for_each_entry(tgt, &vhost->targets, queue) {
5737	if (tgt->action == IBMVFC_TGT_ACTION_INIT) {
5738	tgt->job_step(tgt);
5739	break;
5740	}
5741	}
5742
5743	if (!ibmvfc_dev_init_to_do(vhost))
5744	ibmvfc_set_host_action(vhost, action: IBMVFC_HOST_ACTION_TGT_DEL_FAILED);
5745	break;
5746	default:
5747	break;
5748	}
5749
5750	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
5751	}
5752
5753	/**
5754	* ibmvfc_work - Do task level work
5755	* @data: ibmvfc host struct
5756	*
5757	* Returns:
5758	* zero
5759	**/
5760	static int ibmvfc_work(void *data)
5761	{
5762	struct ibmvfc_host *vhost = data;
5763	int rc;
5764
5765	set_user_nice(current, MIN_NICE);
5766
5767	while (1) {
5768	rc = wait_event_interruptible(vhost->work_wait_q,
5769	ibmvfc_work_to_do(vhost));
5770
5771	BUG_ON(rc);
5772
5773	if (kthread_should_stop())
5774	break;
5775
5776	ibmvfc_do_work(vhost);
5777	}
5778
5779	ibmvfc_dbg(vhost, "ibmvfc kthread exiting...\n");
5780	return 0;
5781	}
5782
5783	/**
5784	* ibmvfc_alloc_queue - Allocate queue
5785	* @vhost: ibmvfc host struct
5786	* @queue: ibmvfc queue to allocate
5787	* @fmt: queue format to allocate
5788	*
5789	* Returns:
5790	* 0 on success / non-zero on failure
5791	**/
5792	static int ibmvfc_alloc_queue(struct ibmvfc_host *vhost,
5793	struct ibmvfc_queue *queue,
5794	enum ibmvfc_msg_fmt fmt)
5795	{
5796	struct device *dev = vhost->dev;
5797	size_t fmt_size;
5798
5799	ENTER;
5800	spin_lock_init(&queue->_lock);
5801	queue->q_lock = &queue->_lock;
5802
5803	switch (fmt) {
5804	case IBMVFC_CRQ_FMT:
5805	fmt_size = sizeof(*queue->msgs.crq);
5806	queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_REQ;
5807	queue->evt_depth = scsi_qdepth;
5808	queue->reserved_depth = IBMVFC_NUM_INTERNAL_REQ;
5809	break;
5810	case IBMVFC_ASYNC_FMT:
5811	fmt_size = sizeof(*queue->msgs.async);
5812	break;
5813	case IBMVFC_SUB_CRQ_FMT:
5814	fmt_size = sizeof(*queue->msgs.scrq);
5815	/* We need one extra event for Cancel Commands */
5816	queue->total_depth = scsi_qdepth + IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5817	queue->evt_depth = scsi_qdepth;
5818	queue->reserved_depth = IBMVFC_NUM_INTERNAL_SUBQ_REQ;
5819	break;
5820	default:
5821	dev_warn(dev, "Unknown command/response queue message format: %d\n", fmt);
5822	return -EINVAL;
5823	}
5824
5825	queue->fmt = fmt;
5826	if (ibmvfc_init_event_pool(vhost, queue)) {
5827	dev_err(dev, "Couldn't initialize event pool.\n");
5828	return -ENOMEM;
5829	}
5830
5831	queue->msgs.handle = (void *)get_zeroed_page(GFP_KERNEL);
5832	if (!queue->msgs.handle)
5833	return -ENOMEM;
5834
5835	queue->msg_token = dma_map_single(dev, queue->msgs.handle, PAGE_SIZE,
5836	DMA_BIDIRECTIONAL);
5837
5838	if (dma_mapping_error(dev, dma_addr: queue->msg_token)) {
5839	free_page((unsigned long)queue->msgs.handle);
5840	queue->msgs.handle = NULL;
5841	return -ENOMEM;
5842	}
5843
5844	queue->cur = 0;
5845	queue->size = PAGE_SIZE / fmt_size;
5846
5847	queue->vhost = vhost;
5848	return 0;
5849	}
5850
5851	/**
5852	* ibmvfc_init_crq - Initializes and registers CRQ with hypervisor
5853	* @vhost: ibmvfc host struct
5854	*
5855	* Allocates a page for messages, maps it for dma, and registers
5856	* the crq with the hypervisor.
5857	*
5858	* Return value:
5859	* zero on success / other on failure
5860	**/
5861	static int ibmvfc_init_crq(struct ibmvfc_host *vhost)
5862	{
5863	int rc, retrc = -ENOMEM;
5864	struct device *dev = vhost->dev;
5865	struct vio_dev *vdev = to_vio_dev(dev);
5866	struct ibmvfc_queue *crq = &vhost->crq;
5867
5868	ENTER;
5869	if (ibmvfc_alloc_queue(vhost, queue: crq, fmt: IBMVFC_CRQ_FMT))
5870	return -ENOMEM;
5871
5872	retrc = rc = plpar_hcall_norets(H_REG_CRQ, vdev->unit_address,
5873	crq->msg_token, PAGE_SIZE);
5874
5875	if (rc == H_RESOURCE)
5876	/* maybe kexecing and resource is busy. try a reset */
5877	retrc = rc = ibmvfc_reset_crq(vhost);
5878
5879	if (rc == H_CLOSED)
5880	dev_warn(dev, "Partner adapter not ready\n");
5881	else if (rc) {
5882	dev_warn(dev, "Error %d opening adapter\n", rc);
5883	goto reg_crq_failed;
5884	}
5885
5886	retrc = 0;
5887
5888	tasklet_init(t: &vhost->tasklet, func: (void *)ibmvfc_tasklet, data: (unsigned long)vhost);
5889
5890	if ((rc = request_irq(irq: vdev->irq, handler: ibmvfc_interrupt, flags: 0, IBMVFC_NAME, dev: vhost))) {
5891	dev_err(dev, "Couldn't register irq 0x%x. rc=%d\n", vdev->irq, rc);
5892	goto req_irq_failed;
5893	}
5894
5895	if ((rc = vio_enable_interrupts(vdev))) {
5896	dev_err(dev, "Error %d enabling interrupts\n", rc);
5897	goto req_irq_failed;
5898	}
5899
5900	LEAVE;
5901	return retrc;
5902
5903	req_irq_failed:
5904	tasklet_kill(t: &vhost->tasklet);
5905	do {
5906	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
5907	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5908	reg_crq_failed:
5909	ibmvfc_free_queue(vhost, queue: crq);
5910	return retrc;
5911	}
5912
5913	static int ibmvfc_register_channel(struct ibmvfc_host *vhost,
5914	struct ibmvfc_channels *channels,
5915	int index)
5916	{
5917	struct device *dev = vhost->dev;
5918	struct vio_dev *vdev = to_vio_dev(dev);
5919	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5920	int rc = -ENOMEM;
5921
5922	ENTER;
5923
5924	rc = h_reg_sub_crq(unit_address: vdev->unit_address, ioba: scrq->msg_token, PAGE_SIZE,
5925	cookie: &scrq->cookie, irq: &scrq->hw_irq);
5926
5927	/* H_CLOSED indicates successful register, but no CRQ partner */
5928	if (rc && rc != H_CLOSED) {
5929	dev_warn(dev, "Error registering sub-crq: %d\n", rc);
5930	if (rc == H_PARAMETER)
5931	dev_warn_once(dev, "Firmware may not support MQ\n");
5932	goto reg_failed;
5933	}
5934
5935	scrq->irq = irq_create_mapping(NULL, hwirq: scrq->hw_irq);
5936
5937	if (!scrq->irq) {
5938	rc = -EINVAL;
5939	dev_err(dev, "Error mapping sub-crq[%d] irq\n", index);
5940	goto irq_failed;
5941	}
5942
5943	switch (channels->protocol) {
5944	case IBMVFC_PROTO_SCSI:
5945	snprintf(buf: scrq->name, size: sizeof(scrq->name), fmt: "ibmvfc-%x-scsi%d",
5946	vdev->unit_address, index);
5947	scrq->handler = ibmvfc_interrupt_mq;
5948	break;
5949	case IBMVFC_PROTO_NVME:
5950	snprintf(buf: scrq->name, size: sizeof(scrq->name), fmt: "ibmvfc-%x-nvmf%d",
5951	vdev->unit_address, index);
5952	scrq->handler = ibmvfc_interrupt_mq;
5953	break;
5954	default:
5955	dev_err(dev, "Unknown channel protocol (%d)\n",
5956	channels->protocol);
5957	goto irq_failed;
5958	}
5959
5960	rc = request_irq(irq: scrq->irq, handler: scrq->handler, flags: 0, name: scrq->name, dev: scrq);
5961
5962	if (rc) {
5963	dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index);
5964	irq_dispose_mapping(virq: scrq->irq);
5965	goto irq_failed;
5966	}
5967
5968	scrq->hwq_id = index;
5969
5970	LEAVE;
5971	return 0;
5972
5973	irq_failed:
5974	do {
5975	rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address, scrq->cookie);
5976	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
5977	reg_failed:
5978	LEAVE;
5979	return rc;
5980	}
5981
5982	static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost,
5983	struct ibmvfc_channels *channels,
5984	int index)
5985	{
5986	struct device *dev = vhost->dev;
5987	struct vio_dev *vdev = to_vio_dev(dev);
5988	struct ibmvfc_queue *scrq = &channels->scrqs[index];
5989	long rc;
5990
5991	ENTER;
5992
5993	free_irq(scrq->irq, scrq);
5994	irq_dispose_mapping(virq: scrq->irq);
5995	scrq->irq = 0;
5996
5997	do {
5998	rc = plpar_hcall_norets(H_FREE_SUB_CRQ, vdev->unit_address,
5999	scrq->cookie);
6000	} while (rc == H_BUSY || H_IS_LONG_BUSY(rc));
6001
6002	if (rc)
6003	dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc);
6004
6005	/* Clean out the queue */
6006	memset(scrq->msgs.crq, 0, PAGE_SIZE);
6007	scrq->cur = 0;
6008
6009	LEAVE;
6010	}
6011
6012	static void ibmvfc_reg_sub_crqs(struct ibmvfc_host *vhost,
6013	struct ibmvfc_channels *channels)
6014	{
6015	int i, j;
6016
6017	ENTER;
6018	if (!vhost->mq_enabled || !channels->scrqs)
6019	return;
6020
6021	for (i = 0; i < channels->max_queues; i++) {
6022	if (ibmvfc_register_channel(vhost, channels, index: i)) {
6023	for (j = i; j > 0; j--)
6024	ibmvfc_deregister_channel(vhost, channels, index: j - 1);
6025	vhost->do_enquiry = 0;
6026	return;
6027	}
6028	}
6029
6030	LEAVE;
6031	}
6032
6033	static void ibmvfc_dereg_sub_crqs(struct ibmvfc_host *vhost,
6034	struct ibmvfc_channels *channels)
6035	{
6036	int i;
6037
6038	ENTER;
6039	if (!vhost->mq_enabled || !channels->scrqs)
6040	return;
6041
6042	for (i = 0; i < channels->max_queues; i++)
6043	ibmvfc_deregister_channel(vhost, channels, index: i);
6044
6045	LEAVE;
6046	}
6047
6048	static int ibmvfc_alloc_channels(struct ibmvfc_host *vhost,
6049	struct ibmvfc_channels *channels)
6050	{
6051	struct ibmvfc_queue *scrq;
6052	int i, j;
6053	int rc = 0;
6054
6055	channels->scrqs = kcalloc(n: channels->max_queues,
6056	size: sizeof(*channels->scrqs),
6057	GFP_KERNEL);
6058	if (!channels->scrqs)
6059	return -ENOMEM;
6060
6061	for (i = 0; i < channels->max_queues; i++) {
6062	scrq = &channels->scrqs[i];
6063	rc = ibmvfc_alloc_queue(vhost, queue: scrq, fmt: IBMVFC_SUB_CRQ_FMT);
6064	if (rc) {
6065	for (j = i; j > 0; j--) {
6066	scrq = &channels->scrqs[j - 1];
6067	ibmvfc_free_queue(vhost, queue: scrq);
6068	}
6069	kfree(objp: channels->scrqs);
6070	channels->scrqs = NULL;
6071	channels->active_queues = 0;
6072	return rc;
6073	}
6074	}
6075
6076	return rc;
6077	}
6078
6079	static void ibmvfc_init_sub_crqs(struct ibmvfc_host *vhost)
6080	{
6081	ENTER;
6082	if (!vhost->mq_enabled)
6083	return;
6084
6085	if (ibmvfc_alloc_channels(vhost, channels: &vhost->scsi_scrqs)) {
6086	vhost->do_enquiry = 0;
6087	vhost->mq_enabled = 0;
6088	return;
6089	}
6090
6091	ibmvfc_reg_sub_crqs(vhost, channels: &vhost->scsi_scrqs);
6092
6093	LEAVE;
6094	}
6095
6096	static void ibmvfc_release_channels(struct ibmvfc_host *vhost,
6097	struct ibmvfc_channels *channels)
6098	{
6099	struct ibmvfc_queue *scrq;
6100	int i;
6101
6102	if (channels->scrqs) {
6103	for (i = 0; i < channels->max_queues; i++) {
6104	scrq = &channels->scrqs[i];
6105	ibmvfc_free_queue(vhost, queue: scrq);
6106	}
6107
6108	kfree(objp: channels->scrqs);
6109	channels->scrqs = NULL;
6110	channels->active_queues = 0;
6111	}
6112	}
6113
6114	static void ibmvfc_release_sub_crqs(struct ibmvfc_host *vhost)
6115	{
6116	ENTER;
6117	if (!vhost->scsi_scrqs.scrqs)
6118	return;
6119
6120	ibmvfc_dereg_sub_crqs(vhost, channels: &vhost->scsi_scrqs);
6121
6122	ibmvfc_release_channels(vhost, channels: &vhost->scsi_scrqs);
6123	LEAVE;
6124	}
6125
6126	static void ibmvfc_free_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6127	{
6128	dma_free_coherent(dev, size: channels->disc_buf_sz, cpu_addr: channels->disc_buf,
6129	dma_handle: channels->disc_buf_dma);
6130	}
6131
6132	/**
6133	* ibmvfc_free_mem - Free memory for vhost
6134	* @vhost: ibmvfc host struct
6135	*
6136	* Return value:
6137	* none
6138	**/
6139	static void ibmvfc_free_mem(struct ibmvfc_host *vhost)
6140	{
6141	struct ibmvfc_queue *async_q = &vhost->async_crq;
6142
6143	ENTER;
6144	mempool_destroy(pool: vhost->tgt_pool);
6145	kfree(objp: vhost->trace);
6146	ibmvfc_free_disc_buf(dev: vhost->dev, channels: &vhost->scsi_scrqs);
6147	dma_free_coherent(dev: vhost->dev, size: sizeof(*vhost->login_buf),
6148	cpu_addr: vhost->login_buf, dma_handle: vhost->login_buf_dma);
6149	dma_free_coherent(dev: vhost->dev, size: sizeof(*vhost->channel_setup_buf),
6150	cpu_addr: vhost->channel_setup_buf, dma_handle: vhost->channel_setup_dma);
6151	dma_pool_destroy(pool: vhost->sg_pool);
6152	ibmvfc_free_queue(vhost, queue: async_q);
6153	LEAVE;
6154	}
6155
6156	static int ibmvfc_alloc_disc_buf(struct device *dev, struct ibmvfc_channels *channels)
6157	{
6158	channels->disc_buf_sz = sizeof(*channels->disc_buf) * max_targets;
6159	channels->disc_buf = dma_alloc_coherent(dev, size: channels->disc_buf_sz,
6160	dma_handle: &channels->disc_buf_dma, GFP_KERNEL);
6161
6162	if (!channels->disc_buf) {
6163	dev_err(dev, "Couldn't allocate %s Discover Targets buffer\n",
6164	(channels->protocol == IBMVFC_PROTO_SCSI) ? "SCSI" : "NVMe");
6165	return -ENOMEM;
6166	}
6167
6168	return 0;
6169	}
6170
6171	/**
6172	* ibmvfc_alloc_mem - Allocate memory for vhost
6173	* @vhost: ibmvfc host struct
6174	*
6175	* Return value:
6176	* 0 on success / non-zero on failure
6177	**/
6178	static int ibmvfc_alloc_mem(struct ibmvfc_host *vhost)
6179	{
6180	struct ibmvfc_queue *async_q = &vhost->async_crq;
6181	struct device *dev = vhost->dev;
6182
6183	ENTER;
6184	if (ibmvfc_alloc_queue(vhost, queue: async_q, fmt: IBMVFC_ASYNC_FMT)) {
6185	dev_err(dev, "Couldn't allocate/map async queue.\n");
6186	goto nomem;
6187	}
6188
6189	vhost->sg_pool = dma_pool_create(IBMVFC_NAME, dev,
6190	SG_ALL * sizeof(struct srp_direct_buf),
6191	align: sizeof(struct srp_direct_buf), allocation: 0);
6192
6193	if (!vhost->sg_pool) {
6194	dev_err(dev, "Failed to allocate sg pool\n");
6195	goto unmap_async_crq;
6196	}
6197
6198	vhost->login_buf = dma_alloc_coherent(dev, size: sizeof(*vhost->login_buf),
6199	dma_handle: &vhost->login_buf_dma, GFP_KERNEL);
6200
6201	if (!vhost->login_buf) {
6202	dev_err(dev, "Couldn't allocate NPIV login buffer\n");
6203	goto free_sg_pool;
6204	}
6205
6206	if (ibmvfc_alloc_disc_buf(dev, channels: &vhost->scsi_scrqs))
6207	goto free_login_buffer;
6208
6209	vhost->trace = kcalloc(IBMVFC_NUM_TRACE_ENTRIES,
6210	size: sizeof(struct ibmvfc_trace_entry), GFP_KERNEL);
6211	atomic_set(v: &vhost->trace_index, i: -1);
6212
6213	if (!vhost->trace)
6214	goto free_scsi_disc_buffer;
6215
6216	vhost->tgt_pool = mempool_create_kmalloc_pool(IBMVFC_TGT_MEMPOOL_SZ,
6217	size: sizeof(struct ibmvfc_target));
6218
6219	if (!vhost->tgt_pool) {
6220	dev_err(dev, "Couldn't allocate target memory pool\n");
6221	goto free_trace;
6222	}
6223
6224	vhost->channel_setup_buf = dma_alloc_coherent(dev, size: sizeof(*vhost->channel_setup_buf),
6225	dma_handle: &vhost->channel_setup_dma,
6226	GFP_KERNEL);
6227
6228	if (!vhost->channel_setup_buf) {
6229	dev_err(dev, "Couldn't allocate Channel Setup buffer\n");
6230	goto free_tgt_pool;
6231	}
6232
6233	LEAVE;
6234	return 0;
6235
6236	free_tgt_pool:
6237	mempool_destroy(pool: vhost->tgt_pool);
6238	free_trace:
6239	kfree(objp: vhost->trace);
6240	free_scsi_disc_buffer:
6241	ibmvfc_free_disc_buf(dev, channels: &vhost->scsi_scrqs);
6242	free_login_buffer:
6243	dma_free_coherent(dev, size: sizeof(*vhost->login_buf),
6244	cpu_addr: vhost->login_buf, dma_handle: vhost->login_buf_dma);
6245	free_sg_pool:
6246	dma_pool_destroy(pool: vhost->sg_pool);
6247	unmap_async_crq:
6248	ibmvfc_free_queue(vhost, queue: async_q);
6249	nomem:
6250	LEAVE;
6251	return -ENOMEM;
6252	}
6253
6254	/**
6255	* ibmvfc_rport_add_thread - Worker thread for rport adds
6256	* @work: work struct
6257	*
6258	**/
6259	static void ibmvfc_rport_add_thread(struct work_struct *work)
6260	{
6261	struct ibmvfc_host *vhost = container_of(work, struct ibmvfc_host,
6262	rport_add_work_q);
6263	struct ibmvfc_target *tgt;
6264	struct fc_rport *rport;
6265	unsigned long flags;
6266	int did_work;
6267
6268	ENTER;
6269	spin_lock_irqsave(vhost->host->host_lock, flags);
6270	do {
6271	did_work = 0;
6272	if (vhost->state != IBMVFC_ACTIVE)
6273	break;
6274
6275	list_for_each_entry(tgt, &vhost->targets, queue) {
6276	if (tgt->add_rport) {
6277	did_work = 1;
6278	tgt->add_rport = 0;
6279	kref_get(kref: &tgt->kref);
6280	rport = tgt->rport;
6281	if (!rport) {
6282	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6283	ibmvfc_tgt_add_rport(tgt);
6284	} else if (get_device(dev: &rport->dev)) {
6285	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6286	tgt_dbg(tgt, "Setting rport roles\n");
6287	fc_remote_port_rolechg(rport, roles: tgt->ids.roles);
6288	put_device(dev: &rport->dev);
6289	} else {
6290	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6291	}
6292
6293	kref_put(kref: &tgt->kref, release: ibmvfc_release_tgt);
6294	spin_lock_irqsave(vhost->host->host_lock, flags);
6295	break;
6296	}
6297	}
6298	} while(did_work);
6299
6300	if (vhost->state == IBMVFC_ACTIVE)
6301	vhost->scan_complete = 1;
6302	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6303	LEAVE;
6304	}
6305
6306	/**
6307	* ibmvfc_probe - Adapter hot plug add entry point
6308	* @vdev: vio device struct
6309	* @id: vio device id struct
6310	*
6311	* Return value:
6312	* 0 on success / non-zero on failure
6313	**/
6314	static int ibmvfc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
6315	{
6316	struct ibmvfc_host *vhost;
6317	struct Scsi_Host *shost;
6318	struct device *dev = &vdev->dev;
6319	int rc = -ENOMEM;
6320	unsigned int online_cpus = num_online_cpus();
6321	unsigned int max_scsi_queues = min((unsigned int)IBMVFC_MAX_SCSI_QUEUES, online_cpus);
6322
6323	ENTER;
6324	shost = scsi_host_alloc(&driver_template, sizeof(*vhost));
6325	if (!shost) {
6326	dev_err(dev, "Couldn't allocate host data\n");
6327	goto out;
6328	}
6329
6330	shost->transportt = ibmvfc_transport_template;
6331	shost->can_queue = scsi_qdepth;
6332	shost->max_lun = max_lun;
6333	shost->max_id = max_targets;
6334	shost->max_sectors = IBMVFC_MAX_SECTORS;
6335	shost->max_cmd_len = IBMVFC_MAX_CDB_LEN;
6336	shost->unique_id = shost->host_no;
6337	shost->nr_hw_queues = mq_enabled ? min(max_scsi_queues, nr_scsi_hw_queues) : 1;
6338
6339	vhost = shost_priv(shost);
6340	INIT_LIST_HEAD(list: &vhost->targets);
6341	INIT_LIST_HEAD(list: &vhost->purge);
6342	sprintf(buf: vhost->name, IBMVFC_NAME);
6343	vhost->host = shost;
6344	vhost->dev = dev;
6345	vhost->partition_number = -1;
6346	vhost->log_level = log_level;
6347	vhost->task_set = 1;
6348
6349	vhost->mq_enabled = mq_enabled;
6350	vhost->scsi_scrqs.desired_queues = min(shost->nr_hw_queues, nr_scsi_channels);
6351	vhost->scsi_scrqs.max_queues = shost->nr_hw_queues;
6352	vhost->scsi_scrqs.protocol = IBMVFC_PROTO_SCSI;
6353	vhost->using_channels = 0;
6354	vhost->do_enquiry = 1;
6355	vhost->scan_timeout = 0;
6356
6357	strcpy(p: vhost->partition_name, q: "UNKNOWN");
6358	init_waitqueue_head(&vhost->work_wait_q);
6359	init_waitqueue_head(&vhost->init_wait_q);
6360	INIT_WORK(&vhost->rport_add_work_q, ibmvfc_rport_add_thread);
6361	mutex_init(&vhost->passthru_mutex);
6362
6363	if ((rc = ibmvfc_alloc_mem(vhost)))
6364	goto free_scsi_host;
6365
6366	vhost->work_thread = kthread_run(ibmvfc_work, vhost, "%s_%d", IBMVFC_NAME,
6367	shost->host_no);
6368
6369	if (IS_ERR(ptr: vhost->work_thread)) {
6370	dev_err(dev, "Couldn't create kernel thread: %ld\n",
6371	PTR_ERR(vhost->work_thread));
6372	rc = PTR_ERR(ptr: vhost->work_thread);
6373	goto free_host_mem;
6374	}
6375
6376	if ((rc = ibmvfc_init_crq(vhost))) {
6377	dev_err(dev, "Couldn't initialize crq. rc=%d\n", rc);
6378	goto kill_kthread;
6379	}
6380
6381	if ((rc = scsi_add_host(host: shost, dev)))
6382	goto release_crq;
6383
6384	fc_host_dev_loss_tmo(shost) = IBMVFC_DEV_LOSS_TMO;
6385
6386	if ((rc = ibmvfc_create_trace_file(&shost->shost_dev.kobj,
6387	&ibmvfc_trace_attr))) {
6388	dev_err(dev, "Failed to create trace file. rc=%d\n", rc);
6389	goto remove_shost;
6390	}
6391
6392	ibmvfc_init_sub_crqs(vhost);
6393
6394	if (shost_to_fc_host(shost)->rqst_q)
6395	blk_queue_max_segments(shost_to_fc_host(shost)->rqst_q, 1);
6396	dev_set_drvdata(dev, data: vhost);
6397	spin_lock(lock: &ibmvfc_driver_lock);
6398	list_add_tail(new: &vhost->queue, head: &ibmvfc_head);
6399	spin_unlock(lock: &ibmvfc_driver_lock);
6400
6401	ibmvfc_send_crq_init(vhost);
6402	scsi_scan_host(shost);
6403	return 0;
6404
6405	remove_shost:
6406	scsi_remove_host(shost);
6407	release_crq:
6408	ibmvfc_release_crq_queue(vhost);
6409	kill_kthread:
6410	kthread_stop(k: vhost->work_thread);
6411	free_host_mem:
6412	ibmvfc_free_mem(vhost);
6413	free_scsi_host:
6414	scsi_host_put(t: shost);
6415	out:
6416	LEAVE;
6417	return rc;
6418	}
6419
6420	/**
6421	* ibmvfc_remove - Adapter hot plug remove entry point
6422	* @vdev: vio device struct
6423	*
6424	* Return value:
6425	* 0
6426	**/
6427	static void ibmvfc_remove(struct vio_dev *vdev)
6428	{
6429	struct ibmvfc_host *vhost = dev_get_drvdata(dev: &vdev->dev);
6430	LIST_HEAD(purge);
6431	unsigned long flags;
6432
6433	ENTER;
6434	ibmvfc_remove_trace_file(&vhost->host->shost_dev.kobj, &ibmvfc_trace_attr);
6435
6436	spin_lock_irqsave(vhost->host->host_lock, flags);
6437	ibmvfc_link_down(vhost, state: IBMVFC_HOST_OFFLINE);
6438	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6439
6440	ibmvfc_wait_while_resetting(vhost);
6441	kthread_stop(k: vhost->work_thread);
6442	fc_remove_host(vhost->host);
6443	scsi_remove_host(vhost->host);
6444
6445	spin_lock_irqsave(vhost->host->host_lock, flags);
6446	ibmvfc_purge_requests(vhost, error_code: DID_ERROR);
6447	list_splice_init(list: &vhost->purge, head: &purge);
6448	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6449	ibmvfc_complete_purge(purge_list: &purge);
6450	ibmvfc_release_sub_crqs(vhost);
6451	ibmvfc_release_crq_queue(vhost);
6452
6453	ibmvfc_free_mem(vhost);
6454	spin_lock(lock: &ibmvfc_driver_lock);
6455	list_del(entry: &vhost->queue);
6456	spin_unlock(lock: &ibmvfc_driver_lock);
6457	scsi_host_put(t: vhost->host);
6458	LEAVE;
6459	}
6460
6461	/**
6462	* ibmvfc_resume - Resume from suspend
6463	* @dev: device struct
6464	*
6465	* We may have lost an interrupt across suspend/resume, so kick the
6466	* interrupt handler
6467	*
6468	*/
6469	static int ibmvfc_resume(struct device *dev)
6470	{
6471	unsigned long flags;
6472	struct ibmvfc_host *vhost = dev_get_drvdata(dev);
6473	struct vio_dev *vdev = to_vio_dev(dev);
6474
6475	spin_lock_irqsave(vhost->host->host_lock, flags);
6476	vio_disable_interrupts(vdev);
6477	tasklet_schedule(t: &vhost->tasklet);
6478	spin_unlock_irqrestore(lock: vhost->host->host_lock, flags);
6479	return 0;
6480	}
6481
6482	/**
6483	* ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver
6484	* @vdev: vio device struct
6485	*
6486	* Return value:
6487	* Number of bytes the driver will need to DMA map at the same time in
6488	* order to perform well.
6489	*/
6490	static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev)
6491	{
6492	unsigned long pool_dma;
6493
6494	pool_dma = (IBMVFC_MAX_SCSI_QUEUES * scsi_qdepth) * sizeof(union ibmvfc_iu);
6495	return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun);
6496	}
6497
6498	static const struct vio_device_id ibmvfc_device_table[] = {
6499	{"fcp", "IBM,vfc-client"},
6500	{ "", "" }
6501	};
6502	MODULE_DEVICE_TABLE(vio, ibmvfc_device_table);
6503
6504	static const struct dev_pm_ops ibmvfc_pm_ops = {
6505	.resume = ibmvfc_resume
6506	};
6507
6508	static struct vio_driver ibmvfc_driver = {
6509	.id_table = ibmvfc_device_table,
6510	.probe = ibmvfc_probe,
6511	.remove = ibmvfc_remove,
6512	.get_desired_dma = ibmvfc_get_desired_dma,
6513	.name = IBMVFC_NAME,
6514	.pm = &ibmvfc_pm_ops,
6515	};
6516
6517	static struct fc_function_template ibmvfc_transport_functions = {
6518	.show_host_fabric_name = 1,
6519	.show_host_node_name = 1,
6520	.show_host_port_name = 1,
6521	.show_host_supported_classes = 1,
6522	.show_host_port_type = 1,
6523	.show_host_port_id = 1,
6524	.show_host_maxframe_size = 1,
6525
6526	.get_host_port_state = ibmvfc_get_host_port_state,
6527	.show_host_port_state = 1,
6528
6529	.get_host_speed = ibmvfc_get_host_speed,
6530	.show_host_speed = 1,
6531
6532	.issue_fc_host_lip = ibmvfc_issue_fc_host_lip,
6533	.terminate_rport_io = ibmvfc_terminate_rport_io,
6534
6535	.show_rport_maxframe_size = 1,
6536	.show_rport_supported_classes = 1,
6537
6538	.set_rport_dev_loss_tmo = ibmvfc_set_rport_dev_loss_tmo,
6539	.show_rport_dev_loss_tmo = 1,
6540
6541	.get_starget_node_name = ibmvfc_get_starget_node_name,
6542	.show_starget_node_name = 1,
6543
6544	.get_starget_port_name = ibmvfc_get_starget_port_name,
6545	.show_starget_port_name = 1,
6546
6547	.get_starget_port_id = ibmvfc_get_starget_port_id,
6548	.show_starget_port_id = 1,
6549
6550	.bsg_request = ibmvfc_bsg_request,
6551	.bsg_timeout = ibmvfc_bsg_timeout,
6552	};
6553
6554	/**
6555	* ibmvfc_module_init - Initialize the ibmvfc module
6556	*
6557	* Return value:
6558	* 0 on success / other on failure
6559	**/
6560	static int __init ibmvfc_module_init(void)
6561	{
6562	int rc;
6563
6564	if (!firmware_has_feature(FW_FEATURE_VIO))
6565	return -ENODEV;
6566
6567	printk(KERN_INFO IBMVFC_NAME": IBM Virtual Fibre Channel Driver version: %s %s\n",
6568	IBMVFC_DRIVER_VERSION, IBMVFC_DRIVER_DATE);
6569
6570	ibmvfc_transport_template = fc_attach_transport(&ibmvfc_transport_functions);
6571	if (!ibmvfc_transport_template)
6572	return -ENOMEM;
6573
6574	rc = vio_register_driver(&ibmvfc_driver);
6575	if (rc)
6576	fc_release_transport(ibmvfc_transport_template);
6577	return rc;
6578	}
6579
6580	/**
6581	* ibmvfc_module_exit - Teardown the ibmvfc module
6582	*
6583	* Return value:
6584	* nothing
6585	**/
6586	static void __exit ibmvfc_module_exit(void)
6587	{
6588	vio_unregister_driver(&ibmvfc_driver);
6589	fc_release_transport(ibmvfc_transport_template);
6590	}
6591
6592	module_init(ibmvfc_module_init);
6593	module_exit(ibmvfc_module_exit);
6594