1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * zfcp device driver
4 *
5 * Global definitions for the zfcp device driver.
6 *
7 * Copyright IBM Corp. 2002, 2020
8 */
9
10#ifndef ZFCP_DEF_H
11#define ZFCP_DEF_H
12
13/*************************** INCLUDES *****************************************/
14
15#include <linux/init.h>
16#include <linux/moduleparam.h>
17#include <linux/major.h>
18#include <linux/blkdev.h>
19#include <linux/delay.h>
20#include <linux/timer.h>
21#include <linux/slab.h>
22#include <linux/mempool.h>
23#include <linux/syscalls.h>
24#include <linux/scatterlist.h>
25#include <linux/ioctl.h>
26#include <scsi/fc/fc_fs.h>
27#include <scsi/fc/fc_gs.h>
28#include <scsi/scsi.h>
29#include <scsi/scsi_tcq.h>
30#include <scsi/scsi_cmnd.h>
31#include <scsi/scsi_device.h>
32#include <scsi/scsi_host.h>
33#include <scsi/scsi_transport.h>
34#include <scsi/scsi_transport_fc.h>
35#include <scsi/scsi_bsg_fc.h>
36#include <asm/ccwdev.h>
37#include <asm/debug.h>
38#include <asm/ebcdic.h>
39#include <asm/sysinfo.h>
40#include "zfcp_fsf.h"
41#include "zfcp_fc.h"
42#include "zfcp_qdio.h"
43
44/********************* FSF SPECIFIC DEFINES *********************************/
45
46/* ATTENTION: value must not be used by hardware */
47#define FSF_QTCB_UNSOLICITED_STATUS 0x6305
48
49/*************** ADAPTER/PORT/UNIT AND FSF_REQ STATUS FLAGS ******************/
50
51/*
52 * Note, the leftmost 12 status bits (3 nibbles) are common among adapter, port
53 * and unit. This is a mask for bitwise 'and' with status values.
54 */
55#define ZFCP_COMMON_FLAGS 0xfff00000
56
57/* common status bits */
58#define ZFCP_STATUS_COMMON_RUNNING 0x40000000
59#define ZFCP_STATUS_COMMON_ERP_FAILED 0x20000000
60#define ZFCP_STATUS_COMMON_UNBLOCKED 0x10000000
61#define ZFCP_STATUS_COMMON_OPEN 0x04000000
62#define ZFCP_STATUS_COMMON_ERP_INUSE 0x01000000
63#define ZFCP_STATUS_COMMON_ACCESS_DENIED 0x00800000
64#define ZFCP_STATUS_COMMON_ACCESS_BOXED 0x00400000
65#define ZFCP_STATUS_COMMON_NOESC 0x00200000
66
67/* adapter status */
68#define ZFCP_STATUS_ADAPTER_MB_ACT 0x00000001
69#define ZFCP_STATUS_ADAPTER_QDIOUP 0x00000002
70#define ZFCP_STATUS_ADAPTER_SIOSL_ISSUED 0x00000004
71#define ZFCP_STATUS_ADAPTER_XCONFIG_OK 0x00000008
72#define ZFCP_STATUS_ADAPTER_HOST_CON_INIT 0x00000010
73#define ZFCP_STATUS_ADAPTER_ERP_PENDING 0x00000100
74#define ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED 0x00000200
75#define ZFCP_STATUS_ADAPTER_DATA_DIV_ENABLED 0x00000400
76
77/* remote port status */
78#define ZFCP_STATUS_PORT_PHYS_OPEN 0x00000001
79#define ZFCP_STATUS_PORT_LINK_TEST 0x00000002
80
81/* FSF request status (this does not have a common part) */
82#define ZFCP_STATUS_FSFREQ_ERROR 0x00000008
83#define ZFCP_STATUS_FSFREQ_CLEANUP 0x00000010
84#define ZFCP_STATUS_FSFREQ_ABORTSUCCEEDED 0x00000040
85#define ZFCP_STATUS_FSFREQ_ABORTNOTNEEDED 0x00000080
86#define ZFCP_STATUS_FSFREQ_TMFUNCFAILED 0x00000200
87#define ZFCP_STATUS_FSFREQ_DISMISSED 0x00001000
88#define ZFCP_STATUS_FSFREQ_XDATAINCOMPLETE 0x00020000
89
90/************************* STRUCTURE DEFINITIONS *****************************/
91
92/**
93 * enum zfcp_erp_act_type - Type of ERP action object.
94 * @ZFCP_ERP_ACTION_REOPEN_LUN: LUN recovery.
95 * @ZFCP_ERP_ACTION_REOPEN_PORT: Port recovery.
96 * @ZFCP_ERP_ACTION_REOPEN_PORT_FORCED: Forced port recovery.
97 * @ZFCP_ERP_ACTION_REOPEN_ADAPTER: Adapter recovery.
98 *
99 * Values must fit into u8 because of code dependencies:
100 * zfcp_dbf_rec_trig(), &zfcp_dbf_rec_trigger.want, &zfcp_dbf_rec_trigger.need;
101 * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), &zfcp_dbf_rec_running.rec_action.
102 */
103enum zfcp_erp_act_type {
104 ZFCP_ERP_ACTION_REOPEN_LUN = 1,
105 ZFCP_ERP_ACTION_REOPEN_PORT = 2,
106 ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
107 ZFCP_ERP_ACTION_REOPEN_ADAPTER = 4,
108};
109
110/*
111 * Values must fit into u16 because of code dependencies:
112 * zfcp_dbf_rec_run_lvl(), zfcp_dbf_rec_run(), zfcp_dbf_rec_run_wka(),
113 * &zfcp_dbf_rec_running.rec_step.
114 */
115enum zfcp_erp_steps {
116 ZFCP_ERP_STEP_UNINITIALIZED = 0x0000,
117 ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
118 ZFCP_ERP_STEP_PORT_CLOSING = 0x0100,
119 ZFCP_ERP_STEP_PORT_OPENING = 0x0800,
120 ZFCP_ERP_STEP_LUN_CLOSING = 0x1000,
121 ZFCP_ERP_STEP_LUN_OPENING = 0x2000,
122};
123
124struct zfcp_erp_action {
125 struct list_head list;
126 enum zfcp_erp_act_type type; /* requested action code */
127 struct zfcp_adapter *adapter; /* device which should be recovered */
128 struct zfcp_port *port;
129 struct scsi_device *sdev;
130 u32 status; /* recovery status */
131 enum zfcp_erp_steps step; /* active step of this erp action */
132 u64 fsf_req_id;
133 struct timer_list timer;
134};
135
136/* holds various memory pools of an adapter */
137struct zfcp_adapter_mempool {
138 mempool_t *erp_req;
139 mempool_t *gid_pn_req;
140 mempool_t *scsi_req;
141 mempool_t *scsi_abort;
142 mempool_t *status_read_req;
143 mempool_t *sr_data;
144 mempool_t *gid_pn;
145 mempool_t *qtcb_pool;
146};
147
148struct zfcp_adapter {
149 struct kref ref;
150 u64 peer_wwnn; /* P2P peer WWNN */
151 u64 peer_wwpn; /* P2P peer WWPN */
152 u32 peer_d_id; /* P2P peer D_ID */
153 struct ccw_device *ccw_device; /* S/390 ccw device */
154 struct zfcp_qdio *qdio;
155 u32 hydra_version; /* Hydra version */
156 u32 fsf_lic_version;
157 u32 adapter_features; /* FCP channel features */
158 u32 connection_features; /* host connection features */
159 u32 hardware_version; /* of FCP channel */
160 u32 fc_security_algorithms; /* of FCP channel */
161 u32 fc_security_algorithms_old; /* of FCP channel */
162 u16 timer_ticks; /* time int for a tick */
163 struct Scsi_Host *scsi_host; /* Pointer to mid-layer */
164 struct list_head port_list; /* remote port list */
165 rwlock_t port_list_lock; /* port list lock */
166 u64 req_no; /* unique FSF req number */
167 struct zfcp_reqlist *req_list;
168 u32 fsf_req_seq_no; /* FSF cmnd seq number */
169 rwlock_t abort_lock; /* Protects against SCSI
170 stack abort/command
171 completion races */
172 atomic_t stat_miss; /* # missing status reads*/
173 unsigned int stat_read_buf_num;
174 struct work_struct stat_work;
175 atomic_t status; /* status of this adapter */
176 struct list_head erp_ready_head; /* error recovery for this
177 adapter/devices */
178 wait_queue_head_t erp_ready_wq;
179 struct list_head erp_running_head;
180 rwlock_t erp_lock;
181 wait_queue_head_t erp_done_wqh;
182 struct zfcp_erp_action erp_action; /* pending error recovery */
183 atomic_t erp_counter;
184 u32 erp_total_count; /* total nr of enqueued erp
185 actions */
186 u32 erp_low_mem_count; /* nr of erp actions waiting
187 for memory */
188 struct task_struct *erp_thread;
189 struct zfcp_fc_wka_ports *gs; /* generic services */
190 struct zfcp_dbf *dbf; /* debug traces */
191 struct zfcp_adapter_mempool pool; /* Adapter memory pools */
192 struct fc_host_statistics *fc_stats;
193 struct fsf_qtcb_bottom_port *stats_reset_data;
194 unsigned long stats_reset;
195 struct delayed_work scan_work;
196 struct work_struct ns_up_work;
197 struct service_level service_level;
198 struct workqueue_struct *work_queue;
199 struct device_dma_parameters dma_parms;
200 struct zfcp_fc_events events;
201 unsigned long next_port_scan;
202 struct zfcp_diag_adapter *diagnostics;
203 struct work_struct version_change_lost_work;
204};
205
206struct zfcp_port {
207 struct device dev;
208 struct fc_rport *rport; /* rport of fc transport class */
209 struct list_head list; /* list of remote ports */
210 struct zfcp_adapter *adapter; /* adapter used to access port */
211 struct list_head unit_list; /* head of logical unit list */
212 rwlock_t unit_list_lock; /* unit list lock */
213 atomic_t units; /* zfcp_unit count */
214 atomic_t status; /* status of this remote port */
215 u64 wwnn; /* WWNN if known */
216 u64 wwpn; /* WWPN */
217 u32 d_id; /* D_ID */
218 u32 handle; /* handle assigned by FSF */
219 struct zfcp_erp_action erp_action; /* pending error recovery */
220 atomic_t erp_counter;
221 u32 maxframe_size;
222 u32 supported_classes;
223 u32 connection_info;
224 u32 connection_info_old;
225 struct work_struct gid_pn_work;
226 struct work_struct test_link_work;
227 struct work_struct rport_work;
228 enum { RPORT_NONE, RPORT_ADD, RPORT_DEL } rport_task;
229 unsigned int starget_id;
230};
231
232struct zfcp_latency_record {
233 u32 min;
234 u32 max;
235 u64 sum;
236};
237
238struct zfcp_latency_cont {
239 struct zfcp_latency_record channel;
240 struct zfcp_latency_record fabric;
241 u64 counter;
242};
243
244struct zfcp_latencies {
245 struct zfcp_latency_cont read;
246 struct zfcp_latency_cont write;
247 struct zfcp_latency_cont cmd;
248 spinlock_t lock;
249};
250
251/**
252 * struct zfcp_unit - LUN configured via zfcp sysfs
253 * @dev: struct device for sysfs representation and reference counting
254 * @list: entry in LUN/unit list per zfcp_port
255 * @port: reference to zfcp_port where this LUN is configured
256 * @fcp_lun: 64 bit LUN value
257 * @scsi_work: for running scsi_scan_target
258 *
259 * This is the representation of a LUN that has been configured for
260 * usage. The main data here is the 64 bit LUN value, data for
261 * running I/O and recovery is in struct zfcp_scsi_dev.
262 */
263struct zfcp_unit {
264 struct device dev;
265 struct list_head list;
266 struct zfcp_port *port;
267 u64 fcp_lun;
268 struct work_struct scsi_work;
269};
270
271/**
272 * struct zfcp_scsi_dev - zfcp data per SCSI device
273 * @status: zfcp internal status flags
274 * @lun_handle: handle from "open lun" for issuing FSF requests
275 * @erp_action: zfcp erp data for opening and recovering this LUN
276 * @erp_counter: zfcp erp counter for this LUN
277 * @latencies: FSF channel and fabric latencies
278 * @port: zfcp_port where this LUN belongs to
279 */
280struct zfcp_scsi_dev {
281 atomic_t status;
282 u32 lun_handle;
283 struct zfcp_erp_action erp_action;
284 atomic_t erp_counter;
285 struct zfcp_latencies latencies;
286 struct zfcp_port *port;
287};
288
289/**
290 * sdev_to_zfcp - Access zfcp LUN data for SCSI device
291 * @sdev: scsi_device where to get the zfcp_scsi_dev pointer
292 */
293static inline struct zfcp_scsi_dev *sdev_to_zfcp(struct scsi_device *sdev)
294{
295 return scsi_transport_device_data(sdev);
296}
297
298/**
299 * zfcp_scsi_dev_lun - Return SCSI device LUN as 64 bit FCP LUN
300 * @sdev: SCSI device where to get the LUN from
301 */
302static inline u64 zfcp_scsi_dev_lun(struct scsi_device *sdev)
303{
304 u64 fcp_lun;
305
306 int_to_scsilun(sdev->lun, (struct scsi_lun *)&fcp_lun);
307 return fcp_lun;
308}
309
310/**
311 * struct zfcp_fsf_req - basic FSF request structure
312 * @list: list of FSF requests
313 * @req_id: unique request ID
314 * @adapter: adapter this request belongs to
315 * @qdio_req: qdio queue related values
316 * @completion: used to signal the completion of the request
317 * @status: status of the request
318 * @qtcb: associated QTCB
319 * @data: private data
320 * @timer: timer data of this request
321 * @erp_action: reference to erp action if request issued on behalf of ERP
322 * @pool: reference to memory pool if used for this request
323 * @issued: time when request was send (STCK)
324 * @handler: handler which should be called to process response
325 */
326struct zfcp_fsf_req {
327 struct list_head list;
328 u64 req_id;
329 struct zfcp_adapter *adapter;
330 struct zfcp_qdio_req qdio_req;
331 struct completion completion;
332 u32 status;
333 struct fsf_qtcb *qtcb;
334 void *data;
335 struct timer_list timer;
336 struct zfcp_erp_action *erp_action;
337 mempool_t *pool;
338 unsigned long long issued;
339 void (*handler)(struct zfcp_fsf_req *);
340};
341
342static inline
343int zfcp_adapter_multi_buffer_active(struct zfcp_adapter *adapter)
344{
345 return atomic_read(v: &adapter->status) & ZFCP_STATUS_ADAPTER_MB_ACT;
346}
347
348static inline bool zfcp_fsf_req_is_status_read_buffer(struct zfcp_fsf_req *req)
349{
350 return req->qtcb == NULL;
351}
352
353#endif /* ZFCP_DEF_H */
354

source code of linux/drivers/s390/scsi/zfcp_def.h