1	// SPDX-License-Identifier: GPL-2.0
2	/*
3	* S/390 common I/O routines -- channel subsystem call
4	*
5	* Copyright IBM Corp. 1999,2012
6	* Author(s): Ingo Adlung (adlung@de.ibm.com)
7	* Cornelia Huck (cornelia.huck@de.ibm.com)
8	* Arnd Bergmann (arndb@de.ibm.com)
9	*/
10
11	#define KMSG_COMPONENT "cio"
12	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14	#include <linux/module.h>
15	#include <linux/slab.h>
16	#include <linux/init.h>
17	#include <linux/device.h>
18	#include <linux/mutex.h>
19	#include <linux/pci.h>
20
21	#include <asm/cio.h>
22	#include <asm/chpid.h>
23	#include <asm/chsc.h>
24	#include <asm/crw.h>
25	#include <asm/isc.h>
26	#include <asm/ebcdic.h>
27	#include <asm/ap.h>
28
29	#include "css.h"
30	#include "cio.h"
31	#include "cio_debug.h"
32	#include "ioasm.h"
33	#include "chp.h"
34	#include "chsc.h"
35
36	static void *sei_page;
37	static void *chsc_page;
38	static DEFINE_SPINLOCK(chsc_page_lock);
39
40	#define SEI_VF_FLA 0xc0 /* VF flag for Full Link Address */
41	#define SEI_RS_CHPID 0x4 /* 4 in RS field indicates CHPID */
42
43	/**
44	* chsc_error_from_response() - convert a chsc response to an error
45	* @response: chsc response code
46	*
47	* Returns an appropriate Linux error code for @response.
48	*/
49	int chsc_error_from_response(int response)
50	{
51	switch (response) {
52	case 0x0001:
53	return 0;
54	case 0x0002:
55	case 0x0003:
56	case 0x0006:
57	case 0x0007:
58	case 0x0008:
59	case 0x000a:
60	case 0x0104:
61	return -EINVAL;
62	case 0x0004:
63	case 0x0106: /* "Wrong Channel Parm" for the op 0x003d */
64	return -EOPNOTSUPP;
65	case 0x000b:
66	case 0x0107: /* "Channel busy" for the op 0x003d */
67	return -EBUSY;
68	case 0x0100:
69	case 0x0102:
70	return -ENOMEM;
71	case 0x0108: /* "HW limit exceeded" for the op 0x003d */
72	return -EUSERS;
73	default:
74	return -EIO;
75	}
76	}
77	EXPORT_SYMBOL_GPL(chsc_error_from_response);
78
79	struct chsc_ssd_area {
80	struct chsc_header request;
81	u16 :10;
82	u16 ssid:2;
83	u16 :4;
84	u16 f_sch; /* first subchannel */
85	u16 :16;
86	u16 l_sch; /* last subchannel */
87	u32 :32;
88	struct chsc_header response;
89	u32 :32;
90	u8 sch_valid : 1;
91	u8 dev_valid : 1;
92	u8 st : 3; /* subchannel type */
93	u8 zeroes : 3;
94	u8 unit_addr; /* unit address */
95	u16 devno; /* device number */
96	u8 path_mask;
97	u8 fla_valid_mask;
98	u16 sch; /* subchannel */
99	u8 chpid[8]; /* chpids 0-7 */
100	u16 fla[8]; /* full link addresses 0-7 */
101	} __packed __aligned(PAGE_SIZE);
102
103	int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
104	{
105	struct chsc_ssd_area *ssd_area;
106	unsigned long flags;
107	int ccode;
108	int ret;
109	int i;
110	int mask;
111
112	spin_lock_irqsave(&chsc_page_lock, flags);
113	memset(chsc_page, 0, PAGE_SIZE);
114	ssd_area = chsc_page;
115	ssd_area->request.length = 0x0010;
116	ssd_area->request.code = 0x0004;
117	ssd_area->ssid = schid.ssid;
118	ssd_area->f_sch = schid.sch_no;
119	ssd_area->l_sch = schid.sch_no;
120
121	ccode = chsc(chsc_area: ssd_area);
122	/* Check response. */
123	if (ccode > 0) {
124	ret = (ccode == 3) ? -ENODEV : -EBUSY;
125	goto out;
126	}
127	ret = chsc_error_from_response(ssd_area->response.code);
128	if (ret != 0) {
129	CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
130	schid.ssid, schid.sch_no,
131	ssd_area->response.code);
132	goto out;
133	}
134	if (!ssd_area->sch_valid) {
135	ret = -ENODEV;
136	goto out;
137	}
138	/* Copy data */
139	ret = 0;
140	memset(ssd, 0, sizeof(struct chsc_ssd_info));
141	if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
142	(ssd_area->st != SUBCHANNEL_TYPE_MSG))
143	goto out;
144	ssd->path_mask = ssd_area->path_mask;
145	ssd->fla_valid_mask = ssd_area->fla_valid_mask;
146	for (i = 0; i < 8; i++) {
147	mask = 0x80 >> i;
148	if (ssd_area->path_mask & mask) {
149	chp_id_init(&ssd->chpid[i]);
150	ssd->chpid[i].id = ssd_area->chpid[i];
151	}
152	if (ssd_area->fla_valid_mask & mask)
153	ssd->fla[i] = ssd_area->fla[i];
154	}
155	out:
156	spin_unlock_irqrestore(lock: &chsc_page_lock, flags);
157	return ret;
158	}
159
160	/**
161	* chsc_ssqd() - store subchannel QDIO data (SSQD)
162	* @schid: id of the subchannel on which SSQD is performed
163	* @ssqd: request and response block for SSQD
164	*
165	* Returns 0 on success.
166	*/
167	int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
168	{
169	memset(ssqd, 0, sizeof(*ssqd));
170	ssqd->request.length = 0x0010;
171	ssqd->request.code = 0x0024;
172	ssqd->first_sch = schid.sch_no;
173	ssqd->last_sch = schid.sch_no;
174	ssqd->ssid = schid.ssid;
175
176	if (chsc(chsc_area: ssqd))
177	return -EIO;
178
179	return chsc_error_from_response(ssqd->response.code);
180	}
181	EXPORT_SYMBOL_GPL(chsc_ssqd);
182
183	/**
184	* chsc_sadc() - set adapter device controls (SADC)
185	* @schid: id of the subchannel on which SADC is performed
186	* @scssc: request and response block for SADC
187	* @summary_indicator_addr: summary indicator address
188	* @subchannel_indicator_addr: subchannel indicator address
189	* @isc: Interruption Subclass for this subchannel
190	*
191	* Returns 0 on success.
192	*/
193	int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
194	u64 summary_indicator_addr, u64 subchannel_indicator_addr, u8 isc)
195	{
196	memset(scssc, 0, sizeof(*scssc));
197	scssc->request.length = 0x0fe0;
198	scssc->request.code = 0x0021;
199	scssc->operation_code = 0;
200
201	scssc->summary_indicator_addr = summary_indicator_addr;
202	scssc->subchannel_indicator_addr = subchannel_indicator_addr;
203
204	scssc->ks = PAGE_DEFAULT_KEY >> 4;
205	scssc->kc = PAGE_DEFAULT_KEY >> 4;
206	scssc->isc = isc;
207	scssc->schid = schid;
208
209	/* enable the time delay disablement facility */
210	if (css_general_characteristics.aif_tdd)
211	scssc->word_with_d_bit = 0x10000000;
212
213	if (chsc(chsc_area: scssc))
214	return -EIO;
215
216	return chsc_error_from_response(scssc->response.code);
217	}
218	EXPORT_SYMBOL_GPL(chsc_sadc);
219
220	static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
221	{
222	spin_lock_irq(lock: sch->lock);
223	if (sch->driver && sch->driver->chp_event)
224	if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
225	goto out_unreg;
226	spin_unlock_irq(lock: sch->lock);
227	return 0;
228
229	out_unreg:
230	sch->lpm = 0;
231	spin_unlock_irq(lock: sch->lock);
232	css_schedule_eval(schid: sch->schid);
233	return 0;
234	}
235
236	void chsc_chp_offline(struct chp_id chpid)
237	{
238	struct channel_path *chp = chpid_to_chp(chpid: chpid);
239	struct chp_link link;
240	char dbf_txt[15];
241
242	sprintf(buf: dbf_txt, fmt: "chpr%x.%02x", chpid.cssid, chpid.id);
243	CIO_TRACE_EVENT(2, dbf_txt);
244
245	if (chp_get_status(chpid: chpid) <= 0)
246	return;
247	memset(&link, 0, sizeof(struct chp_link));
248	link.chpid = chpid;
249	/* Wait until previous actions have settled. */
250	css_wait_for_slow_path();
251
252	mutex_lock(&chp->lock);
253	chp_update_desc(chp);
254	mutex_unlock(lock: &chp->lock);
255
256	for_each_subchannel_staged(fn_known: s390_subchannel_remove_chpid, NULL, data: &link);
257	}
258
259	static int __s390_process_res_acc(struct subchannel *sch, void *data)
260	{
261	spin_lock_irq(lock: sch->lock);
262	if (sch->driver && sch->driver->chp_event)
263	sch->driver->chp_event(sch, data, CHP_ONLINE);
264	spin_unlock_irq(lock: sch->lock);
265
266	return 0;
267	}
268
269	static void s390_process_res_acc(struct chp_link *link)
270	{
271	char dbf_txt[15];
272
273	sprintf(buf: dbf_txt, fmt: "accpr%x.%02x", link->chpid.cssid,
274	link->chpid.id);
275	CIO_TRACE_EVENT( 2, dbf_txt);
276	if (link->fla != 0) {
277	sprintf(buf: dbf_txt, fmt: "fla%x", link->fla);
278	CIO_TRACE_EVENT( 2, dbf_txt);
279	}
280	/* Wait until previous actions have settled. */
281	css_wait_for_slow_path();
282	/*
283	* I/O resources may have become accessible.
284	* Scan through all subchannels that may be concerned and
285	* do a validation on those.
286	* The more information we have (info), the less scanning
287	* will we have to do.
288	*/
289	for_each_subchannel_staged(fn_known: __s390_process_res_acc, NULL, data: link);
290	css_schedule_reprobe();
291	}
292
293	static int process_fces_event(struct subchannel *sch, void *data)
294	{
295	spin_lock_irq(lock: sch->lock);
296	if (sch->driver && sch->driver->chp_event)
297	sch->driver->chp_event(sch, data, CHP_FCES_EVENT);
298	spin_unlock_irq(lock: sch->lock);
299	return 0;
300	}
301
302	struct chsc_sei_nt0_area {
303	u8 flags;
304	u8 vf; /* validity flags */
305	u8 rs; /* reporting source */
306	u8 cc; /* content code */
307	u16 fla; /* full link address */
308	u16 rsid; /* reporting source id */
309	u32 reserved1;
310	u32 reserved2;
311	/* ccdf has to be big enough for a link-incident record */
312	u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
313	} __packed;
314
315	struct chsc_sei_nt2_area {
316	u8 flags; /* p and v bit */
317	u8 reserved1;
318	u8 reserved2;
319	u8 cc; /* content code */
320	u32 reserved3[13];
321	u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
322	} __packed;
323
324	#define CHSC_SEI_NT0 (1ULL << 63)
325	#define CHSC_SEI_NT2 (1ULL << 61)
326
327	struct chsc_sei {
328	struct chsc_header request;
329	u32 reserved1;
330	u64 ntsm; /* notification type mask */
331	struct chsc_header response;
332	u32 :24;
333	u8 nt;
334	union {
335	struct chsc_sei_nt0_area nt0_area;
336	struct chsc_sei_nt2_area nt2_area;
337	u8 nt_area[PAGE_SIZE - 24];
338	} u;
339	} __packed __aligned(PAGE_SIZE);
340
341	/*
342	* Link Incident Record as defined in SA22-7202, "ESCON I/O Interface"
343	*/
344
345	#define LIR_IQ_CLASS_INFO 0
346	#define LIR_IQ_CLASS_DEGRADED 1
347	#define LIR_IQ_CLASS_NOT_OPERATIONAL 2
348
349	struct lir {
350	struct {
351	u32 null:1;
352	u32 reserved:3;
353	u32 class:2;
354	u32 reserved2:2;
355	} __packed iq;
356	u32 ic:8;
357	u32 reserved:16;
358	struct node_descriptor incident_node;
359	struct node_descriptor attached_node;
360	u8 reserved2[32];
361	} __packed;
362
363	#define PARAMS_LEN 10 /* PARAMS=xx,xxxxxx */
364	#define NODEID_LEN 35 /* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
365
366	/* Copy EBCIDC text, convert to ASCII and optionally add delimiter. */
367	static char *store_ebcdic(char *dest, const char *src, unsigned long len,
368	char delim)
369	{
370	memcpy(dest, src, len);
371	EBCASC(dest, len);
372
373	if (delim)
374	dest[len++] = delim;
375
376	return dest + len;
377	}
378
379	static void chsc_link_from_sei(struct chp_link *link,
380	struct chsc_sei_nt0_area *sei_area)
381	{
382	if ((sei_area->vf & SEI_VF_FLA) != 0) {
383	link->fla = sei_area->fla;
384	link->fla_mask = ((sei_area->vf & SEI_VF_FLA) == SEI_VF_FLA) ?
385	0xffff : 0xff00;
386	}
387	}
388
389	/* Format node ID and parameters for output in LIR log message. */
390	static void format_node_data(char *params, char *id, struct node_descriptor *nd)
391	{
392	memset(params, 0, PARAMS_LEN);
393	memset(id, 0, NODEID_LEN);
394
395	if (nd->validity != ND_VALIDITY_VALID) {
396	strscpy(p: params, q: "n/a", PARAMS_LEN);
397	strscpy(p: id, q: "n/a", NODEID_LEN);
398	return;
399	}
400
401	/* PARAMS=xx,xxxxxx */
402	snprintf(buf: params, PARAMS_LEN, fmt: "%02x,%06x", nd->byte0, nd->params);
403	/* NODEID=tttttt/mdl,mmm.ppssssssssssss,xxxx */
404	id = store_ebcdic(dest: id, src: nd->type, len: sizeof(nd->type), delim: '/');
405	id = store_ebcdic(dest: id, src: nd->model, len: sizeof(nd->model), delim: ',');
406	id = store_ebcdic(dest: id, src: nd->manufacturer, len: sizeof(nd->manufacturer), delim: '.');
407	id = store_ebcdic(dest: id, src: nd->plant, len: sizeof(nd->plant), delim: 0);
408	id = store_ebcdic(dest: id, src: nd->seq, len: sizeof(nd->seq), delim: ',');
409	sprintf(buf: id, fmt: "%04X", nd->tag);
410	}
411
412	static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
413	{
414	struct lir *lir = (struct lir *) &sei_area->ccdf;
415	char iuparams[PARAMS_LEN], iunodeid[NODEID_LEN], auparams[PARAMS_LEN],
416	aunodeid[NODEID_LEN];
417
418	CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x, iq=%02x)\n",
419	sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
420
421	/* Ignore NULL Link Incident Records. */
422	if (lir->iq.null)
423	return;
424
425	/* Inform user that a link requires maintenance actions because it has
426	* become degraded or not operational. Note that this log message is
427	* the primary intention behind a Link Incident Record. */
428
429	format_node_data(params: iuparams, id: iunodeid, nd: &lir->incident_node);
430	format_node_data(params: auparams, id: aunodeid, nd: &lir->attached_node);
431
432	switch (lir->iq.class) {
433	case LIR_IQ_CLASS_DEGRADED:
434	pr_warn("Link degraded: RS=%02x RSID=%04x IC=%02x "
435	"IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
436	sei_area->rs, sei_area->rsid, lir->ic, iuparams,
437	iunodeid, auparams, aunodeid);
438	break;
439	case LIR_IQ_CLASS_NOT_OPERATIONAL:
440	pr_err("Link stopped: RS=%02x RSID=%04x IC=%02x "
441	"IUPARAMS=%s IUNODEID=%s AUPARAMS=%s AUNODEID=%s\n",
442	sei_area->rs, sei_area->rsid, lir->ic, iuparams,
443	iunodeid, auparams, aunodeid);
444	break;
445	default:
446	break;
447	}
448	}
449
450	static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
451	{
452	struct channel_path *chp;
453	struct chp_link link;
454	struct chp_id chpid;
455	int status;
456
457	CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
458	"rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
459	if (sei_area->rs != 4)
460	return;
461	chp_id_init(&chpid);
462	chpid.id = sei_area->rsid;
463	/* allocate a new channel path structure, if needed */
464	status = chp_get_status(chpid: chpid);
465	if (!status)
466	return;
467
468	if (status < 0) {
469	chp_new(chpid: chpid);
470	} else {
471	chp = chpid_to_chp(chpid: chpid);
472	mutex_lock(&chp->lock);
473	chp_update_desc(chp);
474	mutex_unlock(lock: &chp->lock);
475	}
476	memset(&link, 0, sizeof(struct chp_link));
477	link.chpid = chpid;
478	chsc_link_from_sei(link: &link, sei_area);
479	s390_process_res_acc(link: &link);
480	}
481
482	static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
483	{
484	struct channel_path *chp;
485	struct chp_id chpid;
486	u8 *data;
487	int num;
488
489	CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
490	if (sei_area->rs != 0)
491	return;
492	data = sei_area->ccdf;
493	chp_id_init(&chpid);
494	for (num = 0; num <= __MAX_CHPID; num++) {
495	if (!chp_test_bit(bitmap: data, num))
496	continue;
497	chpid.id = num;
498
499	CIO_CRW_EVENT(4, "Update information for channel path "
500	"%x.%02x\n", chpid.cssid, chpid.id);
501	chp = chpid_to_chp(chpid: chpid);
502	if (!chp) {
503	chp_new(chpid: chpid);
504	continue;
505	}
506	mutex_lock(&chp->lock);
507	chp_update_desc(chp);
508	mutex_unlock(lock: &chp->lock);
509	}
510	}
511
512	struct chp_config_data {
513	u8 map[32];
514	u8 op;
515	u8 pc;
516	};
517
518	static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
519	{
520	struct chp_config_data *data;
521	struct chp_id chpid;
522	int num;
523	char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
524
525	CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
526	if (sei_area->rs != 0)
527	return;
528	data = (struct chp_config_data *) &(sei_area->ccdf);
529	chp_id_init(&chpid);
530	for (num = 0; num <= __MAX_CHPID; num++) {
531	if (!chp_test_bit(bitmap: data->map, num))
532	continue;
533	chpid.id = num;
534	pr_notice("Processing %s for channel path %x.%02x\n",
535	events[data->op], chpid.cssid, chpid.id);
536	switch (data->op) {
537	case 0:
538	chp_cfg_schedule(chpid: chpid, configure: 1);
539	break;
540	case 1:
541	chp_cfg_schedule(chpid: chpid, configure: 0);
542	break;
543	case 2:
544	chp_cfg_cancel_deconfigure(chpid: chpid);
545	break;
546	}
547	}
548	}
549
550	static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
551	{
552	int ret;
553
554	CIO_CRW_EVENT(4, "chsc: scm change notification\n");
555	if (sei_area->rs != 7)
556	return;
557
558	ret = scm_update_information();
559	if (ret)
560	CIO_CRW_EVENT(0, "chsc: updating change notification"
561	" failed (rc=%d).\n", ret);
562	}
563
564	static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
565	{
566	int ret;
567
568	CIO_CRW_EVENT(4, "chsc: scm available information\n");
569	if (sei_area->rs != 7)
570	return;
571
572	ret = scm_process_availability_information();
573	if (ret)
574	CIO_CRW_EVENT(0, "chsc: process availability information"
575	" failed (rc=%d).\n", ret);
576	}
577
578	static void chsc_process_sei_ap_cfg_chg(struct chsc_sei_nt0_area *sei_area)
579	{
580	CIO_CRW_EVENT(3, "chsc: ap config changed\n");
581	if (sei_area->rs != 5)
582	return;
583
584	ap_bus_cfg_chg();
585	}
586
587	static void chsc_process_sei_fces_event(struct chsc_sei_nt0_area *sei_area)
588	{
589	struct chp_link link;
590	struct chp_id chpid;
591	struct channel_path *chp;
592
593	CIO_CRW_EVENT(4,
594	"chsc: FCES status notification (rs=%02x, rs_id=%04x, FCES-status=%x)\n",
595	sei_area->rs, sei_area->rsid, sei_area->ccdf[0]);
596
597	if (sei_area->rs != SEI_RS_CHPID)
598	return;
599	chp_id_init(&chpid);
600	chpid.id = sei_area->rsid;
601
602	/* Ignore the event on unknown/invalid chp */
603	chp = chpid_to_chp(chpid: chpid);
604	if (!chp)
605	return;
606
607	memset(&link, 0, sizeof(struct chp_link));
608	link.chpid = chpid;
609	chsc_link_from_sei(link: &link, sei_area);
610
611	for_each_subchannel_staged(fn_known: process_fces_event, NULL, data: &link);
612	}
613
614	static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
615	{
616	switch (sei_area->cc) {
617	case 1:
618	zpci_event_error(sei_area->ccdf);
619	break;
620	case 2:
621	zpci_event_availability(sei_area->ccdf);
622	break;
623	default:
624	CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
625	sei_area->cc);
626	break;
627	}
628	}
629
630	static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
631	{
632	/* which kind of information was stored? */
633	switch (sei_area->cc) {
634	case 1: /* link incident*/
635	chsc_process_sei_link_incident(sei_area);
636	break;
637	case 2: /* i/o resource accessibility */
638	chsc_process_sei_res_acc(sei_area);
639	break;
640	case 3: /* ap config changed */
641	chsc_process_sei_ap_cfg_chg(sei_area);
642	break;
643	case 7: /* channel-path-availability information */
644	chsc_process_sei_chp_avail(sei_area);
645	break;
646	case 8: /* channel-path-configuration notification */
647	chsc_process_sei_chp_config(sei_area);
648	break;
649	case 12: /* scm change notification */
650	chsc_process_sei_scm_change(sei_area);
651	break;
652	case 14: /* scm available notification */
653	chsc_process_sei_scm_avail(sei_area);
654	break;
655	case 15: /* FCES event notification */
656	chsc_process_sei_fces_event(sei_area);
657	break;
658	default: /* other stuff */
659	CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
660	sei_area->cc);
661	break;
662	}
663
664	/* Check if we might have lost some information. */
665	if (sei_area->flags & 0x40) {
666	CIO_CRW_EVENT(2, "chsc: event overflow\n");
667	css_schedule_eval_all();
668	}
669	}
670
671	static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
672	{
673	static int ntsm_unsupported;
674
675	while (true) {
676	memset(sei, 0, sizeof(*sei));
677	sei->request.length = 0x0010;
678	sei->request.code = 0x000e;
679	if (!ntsm_unsupported)
680	sei->ntsm = ntsm;
681
682	if (chsc(chsc_area: sei))
683	break;
684
685	if (sei->response.code != 0x0001) {
686	CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
687	sei->response.code, sei->ntsm);
688
689	if (sei->response.code == 3 && sei->ntsm) {
690	/* Fallback for old firmware. */
691	ntsm_unsupported = 1;
692	continue;
693	}
694	break;
695	}
696
697	CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
698	switch (sei->nt) {
699	case 0:
700	chsc_process_sei_nt0(sei_area: &sei->u.nt0_area);
701	break;
702	case 2:
703	chsc_process_sei_nt2(sei_area: &sei->u.nt2_area);
704	break;
705	default:
706	CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
707	break;
708	}
709
710	if (!(sei->u.nt0_area.flags & 0x80))
711	break;
712	}
713	}
714
715	/*
716	* Handle channel subsystem related CRWs.
717	* Use store event information to find out what's going on.
718	*
719	* Note: Access to sei_page is serialized through machine check handler
720	* thread, so no need for locking.
721	*/
722	static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
723	{
724	struct chsc_sei *sei = sei_page;
725
726	if (overflow) {
727	css_schedule_eval_all();
728	return;
729	}
730	CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
731	"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
732	crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
733	crw0->erc, crw0->rsid);
734
735	CIO_TRACE_EVENT(2, "prcss");
736	chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
737	}
738
739	void chsc_chp_online(struct chp_id chpid)
740	{
741	struct channel_path *chp = chpid_to_chp(chpid: chpid);
742	struct chp_link link;
743	char dbf_txt[15];
744
745	sprintf(buf: dbf_txt, fmt: "cadd%x.%02x", chpid.cssid, chpid.id);
746	CIO_TRACE_EVENT(2, dbf_txt);
747
748	if (chp_get_status(chpid: chpid) != 0) {
749	memset(&link, 0, sizeof(struct chp_link));
750	link.chpid = chpid;
751	/* Wait until previous actions have settled. */
752	css_wait_for_slow_path();
753
754	mutex_lock(&chp->lock);
755	chp_update_desc(chp);
756	mutex_unlock(lock: &chp->lock);
757
758	for_each_subchannel_staged(fn_known: __s390_process_res_acc, NULL,
759	data: &link);
760	css_schedule_reprobe();
761	}
762	}
763
764	static void __s390_subchannel_vary_chpid(struct subchannel *sch,
765	struct chp_id chpid, int on)
766	{
767	unsigned long flags;
768	struct chp_link link;
769
770	memset(&link, 0, sizeof(struct chp_link));
771	link.chpid = chpid;
772	spin_lock_irqsave(sch->lock, flags);
773	if (sch->driver && sch->driver->chp_event)
774	sch->driver->chp_event(sch, &link,
775	on ? CHP_VARY_ON : CHP_VARY_OFF);
776	spin_unlock_irqrestore(lock: sch->lock, flags);
777	}
778
779	static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
780	{
781	struct chp_id *chpid = data;
782
783	__s390_subchannel_vary_chpid(sch, *chpid, 0);
784	return 0;
785	}
786
787	static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
788	{
789	struct chp_id *chpid = data;
790
791	__s390_subchannel_vary_chpid(sch, *chpid, 1);
792	return 0;
793	}
794
795	/**
796	* chsc_chp_vary - propagate channel-path vary operation to subchannels
797	* @chpid: channl-path ID
798	* @on: non-zero for vary online, zero for vary offline
799	*/
800	int chsc_chp_vary(struct chp_id chpid, int on)
801	{
802	struct channel_path *chp = chpid_to_chp(chpid: chpid);
803
804	/*
805	* Redo PathVerification on the devices the chpid connects to
806	*/
807	if (on) {
808	/* Try to update the channel path description. */
809	chp_update_desc(chp);
810	for_each_subchannel_staged(fn_known: s390_subchannel_vary_chpid_on,
811	NULL, data: &chpid);
812	css_schedule_reprobe();
813	} else
814	for_each_subchannel_staged(fn_known: s390_subchannel_vary_chpid_off,
815	NULL, data: &chpid);
816
817	return 0;
818	}
819
820	static void
821	chsc_remove_cmg_attr(struct channel_subsystem *css)
822	{
823	int i;
824
825	for (i = 0; i <= __MAX_CHPID; i++) {
826	if (!css->chps[i])
827	continue;
828	chp_remove_cmg_attr(chp: css->chps[i]);
829	}
830	}
831
832	static int
833	chsc_add_cmg_attr(struct channel_subsystem *css)
834	{
835	int i, ret;
836
837	ret = 0;
838	for (i = 0; i <= __MAX_CHPID; i++) {
839	if (!css->chps[i])
840	continue;
841	ret = chp_add_cmg_attr(chp: css->chps[i]);
842	if (ret)
843	goto cleanup;
844	}
845	return ret;
846	cleanup:
847	for (--i; i >= 0; i--) {
848	if (!css->chps[i])
849	continue;
850	chp_remove_cmg_attr(chp: css->chps[i]);
851	}
852	return ret;
853	}
854
855	int __chsc_do_secm(struct channel_subsystem *css, int enable)
856	{
857	struct {
858	struct chsc_header request;
859	u32 operation_code : 2;
860	u32 : 30;
861	u32 key : 4;
862	u32 : 28;
863	u32 zeroes1;
864	u32 cub_addr1;
865	u32 zeroes2;
866	u32 cub_addr2;
867	u32 reserved[13];
868	struct chsc_header response;
869	u32 status : 8;
870	u32 : 4;
871	u32 fmt : 4;
872	u32 : 16;
873	} *secm_area;
874	unsigned long flags;
875	int ret, ccode;
876
877	spin_lock_irqsave(&chsc_page_lock, flags);
878	memset(chsc_page, 0, PAGE_SIZE);
879	secm_area = chsc_page;
880	secm_area->request.length = 0x0050;
881	secm_area->request.code = 0x0016;
882
883	secm_area->key = PAGE_DEFAULT_KEY >> 4;
884	secm_area->cub_addr1 = virt_to_phys(address: css->cub_addr1);
885	secm_area->cub_addr2 = virt_to_phys(address: css->cub_addr2);
886
887	secm_area->operation_code = enable ? 0 : 1;
888
889	ccode = chsc(chsc_area: secm_area);
890	if (ccode > 0) {
891	ret = (ccode == 3) ? -ENODEV : -EBUSY;
892	goto out;
893	}
894
895	switch (secm_area->response.code) {
896	case 0x0102:
897	case 0x0103:
898	ret = -EINVAL;
899	break;
900	default:
901	ret = chsc_error_from_response(secm_area->response.code);
902	}
903	if (ret != 0)
904	CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
905	secm_area->response.code);
906	out:
907	spin_unlock_irqrestore(lock: &chsc_page_lock, flags);
908	return ret;
909	}
910
911	int
912	chsc_secm(struct channel_subsystem *css, int enable)
913	{
914	int ret;
915
916	if (enable && !css->cm_enabled) {
917	css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
918	css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
919	if (!css->cub_addr1 || !css->cub_addr2) {
920	free_page((unsigned long)css->cub_addr1);
921	free_page((unsigned long)css->cub_addr2);
922	return -ENOMEM;
923	}
924	}
925	ret = __chsc_do_secm(css, enable);
926	if (!ret) {
927	css->cm_enabled = enable;
928	if (css->cm_enabled) {
929	ret = chsc_add_cmg_attr(css);
930	if (ret) {
931	__chsc_do_secm(css, enable: 0);
932	css->cm_enabled = 0;
933	}
934	} else
935	chsc_remove_cmg_attr(css);
936	}
937	if (!css->cm_enabled) {
938	free_page((unsigned long)css->cub_addr1);
939	free_page((unsigned long)css->cub_addr2);
940	}
941	return ret;
942	}
943
944	int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
945	int c, int m, void *page)
946	{
947	struct chsc_scpd *scpd_area;
948	int ccode, ret;
949
950	if ((rfmt == 1 || rfmt == 0) && c == 1 &&
951	!css_general_characteristics.fcs)
952	return -EINVAL;
953	if ((rfmt == 2) && !css_general_characteristics.cib)
954	return -EINVAL;
955	if ((rfmt == 3) && !css_general_characteristics.util_str)
956	return -EINVAL;
957
958	memset(page, 0, PAGE_SIZE);
959	scpd_area = page;
960	scpd_area->request.length = 0x0010;
961	scpd_area->request.code = 0x0002;
962	scpd_area->cssid = chpid.cssid;
963	scpd_area->first_chpid = chpid.id;
964	scpd_area->last_chpid = chpid.id;
965	scpd_area->m = m;
966	scpd_area->c = c;
967	scpd_area->fmt = fmt;
968	scpd_area->rfmt = rfmt;
969
970	ccode = chsc(chsc_area: scpd_area);
971	if (ccode > 0)
972	return (ccode == 3) ? -ENODEV : -EBUSY;
973
974	ret = chsc_error_from_response(scpd_area->response.code);
975	if (ret)
976	CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
977	scpd_area->response.code);
978	return ret;
979	}
980	EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
981
982	#define chsc_det_chp_desc(FMT, c) \
983	int chsc_determine_fmt##FMT##_channel_path_desc( \
984	struct chp_id chpid, struct channel_path_desc_fmt##FMT *desc) \
985	{ \
986	struct chsc_scpd *scpd_area; \
987	unsigned long flags; \
988	int ret; \
989	\
990	spin_lock_irqsave(&chsc_page_lock, flags); \
991	scpd_area = chsc_page; \
992	ret = chsc_determine_channel_path_desc(chpid, 0, FMT, c, 0, \
993	scpd_area); \
994	if (ret) \
995	goto out; \
996	\
997	memcpy(desc, scpd_area->data, sizeof(*desc)); \
998	out: \
999	spin_unlock_irqrestore(&chsc_page_lock, flags); \
1000	return ret; \
1001	}
1002
1003	chsc_det_chp_desc(0, 0)
1004	chsc_det_chp_desc(1, 1)
1005	chsc_det_chp_desc(3, 0)
1006
1007	static void
1008	chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
1009	struct cmg_chars *chars)
1010	{
1011	int i, mask;
1012
1013	for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
1014	mask = 0x80 >> (i + 3);
1015	if (cmcv & mask)
1016	chp->cmg_chars.values[i] = chars->values[i];
1017	else
1018	chp->cmg_chars.values[i] = 0;
1019	}
1020	}
1021
1022	int chsc_get_channel_measurement_chars(struct channel_path *chp)
1023	{
1024	unsigned long flags;
1025	int ccode, ret;
1026
1027	struct {
1028	struct chsc_header request;
1029	u32 : 24;
1030	u32 first_chpid : 8;
1031	u32 : 24;
1032	u32 last_chpid : 8;
1033	u32 zeroes1;
1034	struct chsc_header response;
1035	u32 zeroes2;
1036	u32 not_valid : 1;
1037	u32 shared : 1;
1038	u32 : 22;
1039	u32 chpid : 8;
1040	u32 cmcv : 5;
1041	u32 : 11;
1042	u32 cmgq : 8;
1043	u32 cmg : 8;
1044	u32 zeroes3;
1045	u32 data[NR_MEASUREMENT_CHARS];
1046	} *scmc_area;
1047
1048	chp->shared = -1;
1049	chp->cmg = -1;
1050
1051	if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm)
1052	return -EINVAL;
1053
1054	spin_lock_irqsave(&chsc_page_lock, flags);
1055	memset(chsc_page, 0, PAGE_SIZE);
1056	scmc_area = chsc_page;
1057	scmc_area->request.length = 0x0010;
1058	scmc_area->request.code = 0x0022;
1059	scmc_area->first_chpid = chp->chpid.id;
1060	scmc_area->last_chpid = chp->chpid.id;
1061
1062	ccode = chsc(chsc_area: scmc_area);
1063	if (ccode > 0) {
1064	ret = (ccode == 3) ? -ENODEV : -EBUSY;
1065	goto out;
1066	}
1067
1068	ret = chsc_error_from_response(scmc_area->response.code);
1069	if (ret) {
1070	CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
1071	scmc_area->response.code);
1072	goto out;
1073	}
1074	if (scmc_area->not_valid)
1075	goto out;
1076
1077	chp->cmg = scmc_area->cmg;
1078	chp->shared = scmc_area->shared;
1079	if (chp->cmg != 2 && chp->cmg != 3) {
1080	/* No cmg-dependent data. */
1081	goto out;
1082	}
1083	chsc_initialize_cmg_chars(chp, cmcv: scmc_area->cmcv,
1084	chars: (struct cmg_chars *) &scmc_area->data);
1085	out:
1086	spin_unlock_irqrestore(lock: &chsc_page_lock, flags);
1087	return ret;
1088	}
1089
1090	int __init chsc_init(void)
1091	{
1092	int ret;
1093
1094	sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1095	chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
1096	if (!sei_page || !chsc_page) {
1097	ret = -ENOMEM;
1098	goto out_err;
1099	}
1100	ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
1101	if (ret)
1102	goto out_err;
1103	return ret;
1104	out_err:
1105	free_page((unsigned long)chsc_page);
1106	free_page((unsigned long)sei_page);
1107	return ret;
1108	}
1109
1110	void __init chsc_init_cleanup(void)
1111	{
1112	crw_unregister_handler(CRW_RSC_CSS);
1113	free_page((unsigned long)chsc_page);
1114	free_page((unsigned long)sei_page);
1115	}
1116
1117	int __chsc_enable_facility(struct chsc_sda_area *sda_area, int operation_code)
1118	{
1119	int ret;
1120
1121	sda_area->request.length = 0x0400;
1122	sda_area->request.code = 0x0031;
1123	sda_area->operation_code = operation_code;
1124
1125	ret = chsc(chsc_area: sda_area);
1126	if (ret > 0) {
1127	ret = (ret == 3) ? -ENODEV : -EBUSY;
1128	goto out;
1129	}
1130
1131	switch (sda_area->response.code) {
1132	case 0x0101:
1133	ret = -EOPNOTSUPP;
1134	break;
1135	default:
1136	ret = chsc_error_from_response(sda_area->response.code);
1137	}
1138	out:
1139	return ret;
1140	}
1141
1142	int chsc_enable_facility(int operation_code)
1143	{
1144	struct chsc_sda_area *sda_area;
1145	unsigned long flags;
1146	int ret;
1147
1148	spin_lock_irqsave(&chsc_page_lock, flags);
1149	memset(chsc_page, 0, PAGE_SIZE);
1150	sda_area = chsc_page;
1151
1152	ret = __chsc_enable_facility(sda_area, operation_code);
1153	if (ret != 0)
1154	CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1155	operation_code, sda_area->response.code);
1156
1157	spin_unlock_irqrestore(lock: &chsc_page_lock, flags);
1158	return ret;
1159	}
1160
1161	int __init chsc_get_cssid_iid(int idx, u8 *cssid, u8 *iid)
1162	{
1163	struct {
1164	struct chsc_header request;
1165	u8 atype;
1166	u32 : 24;
1167	u32 reserved1[6];
1168	struct chsc_header response;
1169	u32 reserved2[3];
1170	struct {
1171	u8 cssid;
1172	u8 iid;
1173	u32 : 16;
1174	} list[];
1175	} *sdcal_area;
1176	int ret;
1177
1178	spin_lock_irq(lock: &chsc_page_lock);
1179	memset(chsc_page, 0, PAGE_SIZE);
1180	sdcal_area = chsc_page;
1181	sdcal_area->request.length = 0x0020;
1182	sdcal_area->request.code = 0x0034;
1183	sdcal_area->atype = 4;
1184
1185	ret = chsc(chsc_area: sdcal_area);
1186	if (ret) {
1187	ret = (ret == 3) ? -ENODEV : -EBUSY;
1188	goto exit;
1189	}
1190
1191	ret = chsc_error_from_response(sdcal_area->response.code);
1192	if (ret) {
1193	CIO_CRW_EVENT(2, "chsc: sdcal failed (rc=%04x)\n",
1194	sdcal_area->response.code);
1195	goto exit;
1196	}
1197
1198	if ((addr_t) &sdcal_area->list[idx] <
1199	(addr_t) &sdcal_area->response + sdcal_area->response.length) {
1200	*cssid = sdcal_area->list[idx].cssid;
1201	*iid = sdcal_area->list[idx].iid;
1202	}
1203	else
1204	ret = -ENODEV;
1205	exit:
1206	spin_unlock_irq(lock: &chsc_page_lock);
1207	return ret;
1208	}
1209
1210	struct css_general_char css_general_characteristics;
1211	struct css_chsc_char css_chsc_characteristics;
1212
1213	int __init
1214	chsc_determine_css_characteristics(void)
1215	{
1216	unsigned long flags;
1217	int result;
1218	struct {
1219	struct chsc_header request;
1220	u32 reserved1;
1221	u32 reserved2;
1222	u32 reserved3;
1223	struct chsc_header response;
1224	u32 reserved4;
1225	u32 general_char[510];
1226	u32 chsc_char[508];
1227	} *scsc_area;
1228
1229	spin_lock_irqsave(&chsc_page_lock, flags);
1230	memset(chsc_page, 0, PAGE_SIZE);
1231	scsc_area = chsc_page;
1232	scsc_area->request.length = 0x0010;
1233	scsc_area->request.code = 0x0010;
1234
1235	result = chsc(chsc_area: scsc_area);
1236	if (result) {
1237	result = (result == 3) ? -ENODEV : -EBUSY;
1238	goto exit;
1239	}
1240
1241	result = chsc_error_from_response(scsc_area->response.code);
1242	if (result == 0) {
1243	memcpy(&css_general_characteristics, scsc_area->general_char,
1244	sizeof(css_general_characteristics));
1245	memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1246	sizeof(css_chsc_characteristics));
1247	} else
1248	CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1249	scsc_area->response.code);
1250	exit:
1251	spin_unlock_irqrestore(lock: &chsc_page_lock, flags);
1252	return result;
1253	}
1254
1255	EXPORT_SYMBOL_GPL(css_general_characteristics);
1256	EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1257
1258	int chsc_sstpc(void *page, unsigned int op, u16 ctrl, long *clock_delta)
1259	{
1260	struct {
1261	struct chsc_header request;
1262	unsigned int rsvd0;
1263	unsigned int op : 8;
1264	unsigned int rsvd1 : 8;
1265	unsigned int ctrl : 16;
1266	unsigned int rsvd2[5];
1267	struct chsc_header response;
1268	unsigned int rsvd3[3];
1269	s64 clock_delta;
1270	unsigned int rsvd4[2];
1271	} *rr;
1272	int rc;
1273
1274	memset(page, 0, PAGE_SIZE);
1275	rr = page;
1276	rr->request.length = 0x0020;
1277	rr->request.code = 0x0033;
1278	rr->op = op;
1279	rr->ctrl = ctrl;
1280	rc = chsc(chsc_area: rr);
1281	if (rc)
1282	return -EIO;
1283	rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1284	if (clock_delta)
1285	*clock_delta = rr->clock_delta;
1286	return rc;
1287	}
1288
1289	int chsc_sstpi(void *page, void *result, size_t size)
1290	{
1291	struct {
1292	struct chsc_header request;
1293	unsigned int rsvd0[3];
1294	struct chsc_header response;
1295	char data[];
1296	} *rr;
1297	int rc;
1298
1299	memset(page, 0, PAGE_SIZE);
1300	rr = page;
1301	rr->request.length = 0x0010;
1302	rr->request.code = 0x0038;
1303	rc = chsc(chsc_area: rr);
1304	if (rc)
1305	return -EIO;
1306	memcpy(result, &rr->data, size);
1307	return (rr->response.code == 0x0001) ? 0 : -EIO;
1308	}
1309
1310	int chsc_stzi(void *page, void *result, size_t size)
1311	{
1312	struct {
1313	struct chsc_header request;
1314	unsigned int rsvd0[3];
1315	struct chsc_header response;
1316	char data[];
1317	} *rr;
1318	int rc;
1319
1320	memset(page, 0, PAGE_SIZE);
1321	rr = page;
1322	rr->request.length = 0x0010;
1323	rr->request.code = 0x003e;
1324	rc = chsc(chsc_area: rr);
1325	if (rc)
1326	return -EIO;
1327	memcpy(result, &rr->data, size);
1328	return (rr->response.code == 0x0001) ? 0 : -EIO;
1329	}
1330
1331	int chsc_siosl(struct subchannel_id schid)
1332	{
1333	struct {
1334	struct chsc_header request;
1335	u32 word1;
1336	struct subchannel_id sid;
1337	u32 word3;
1338	struct chsc_header response;
1339	u32 word[11];
1340	} *siosl_area;
1341	unsigned long flags;
1342	int ccode;
1343	int rc;
1344
1345	spin_lock_irqsave(&chsc_page_lock, flags);
1346	memset(chsc_page, 0, PAGE_SIZE);
1347	siosl_area = chsc_page;
1348	siosl_area->request.length = 0x0010;
1349	siosl_area->request.code = 0x0046;
1350	siosl_area->word1 = 0x80000000;
1351	siosl_area->sid = schid;
1352
1353	ccode = chsc(chsc_area: siosl_area);
1354	if (ccode > 0) {
1355	if (ccode == 3)
1356	rc = -ENODEV;
1357	else
1358	rc = -EBUSY;
1359	CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1360	schid.ssid, schid.sch_no, ccode);
1361	goto out;
1362	}
1363	rc = chsc_error_from_response(siosl_area->response.code);
1364	if (rc)
1365	CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1366	schid.ssid, schid.sch_no,
1367	siosl_area->response.code);
1368	else
1369	CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1370	schid.ssid, schid.sch_no);
1371	out:
1372	spin_unlock_irqrestore(lock: &chsc_page_lock, flags);
1373	return rc;
1374	}
1375	EXPORT_SYMBOL_GPL(chsc_siosl);
1376
1377	/**
1378	* chsc_scm_info() - store SCM information (SSI)
1379	* @scm_area: request and response block for SSI
1380	* @token: continuation token
1381	*
1382	* Returns 0 on success.
1383	*/
1384	int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1385	{
1386	int ccode, ret;
1387
1388	memset(scm_area, 0, sizeof(*scm_area));
1389	scm_area->request.length = 0x0020;
1390	scm_area->request.code = 0x004C;
1391	scm_area->reqtok = token;
1392
1393	ccode = chsc(chsc_area: scm_area);
1394	if (ccode > 0) {
1395	ret = (ccode == 3) ? -ENODEV : -EBUSY;
1396	goto out;
1397	}
1398	ret = chsc_error_from_response(scm_area->response.code);
1399	if (ret != 0)
1400	CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1401	scm_area->response.code);
1402	out:
1403	return ret;
1404	}
1405	EXPORT_SYMBOL_GPL(chsc_scm_info);
1406
1407	/**
1408	* chsc_pnso() - Perform Network-Subchannel Operation
1409	* @schid: id of the subchannel on which PNSO is performed
1410	* @pnso_area: request and response block for the operation
1411	* @oc: Operation Code
1412	* @resume_token: resume token for multiblock response
1413	* @cnc: Boolean change-notification control
1414	*
1415	* pnso_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1416	*
1417	* Returns 0 on success.
1418	*/
1419	int chsc_pnso(struct subchannel_id schid, struct chsc_pnso_area *pnso_area,
1420	u8 oc, struct chsc_pnso_resume_token resume_token, int cnc)
1421	{
1422	memset(pnso_area, 0, sizeof(*pnso_area));
1423	pnso_area->request.length = 0x0030;
1424	pnso_area->request.code = 0x003d; /* network-subchannel operation */
1425	pnso_area->m = schid.m;
1426	pnso_area->ssid = schid.ssid;
1427	pnso_area->sch = schid.sch_no;
1428	pnso_area->cssid = schid.cssid;
1429	pnso_area->oc = oc;
1430	pnso_area->resume_token = resume_token;
1431	pnso_area->n = (cnc != 0);
1432	if (chsc(chsc_area: pnso_area))
1433	return -EIO;
1434	return chsc_error_from_response(pnso_area->response.code);
1435	}
1436
1437	int chsc_sgib(u32 origin)
1438	{
1439	struct {
1440	struct chsc_header request;
1441	u16 op;
1442	u8 reserved01[2];
1443	u8 reserved02:4;
1444	u8 fmt:4;
1445	u8 reserved03[7];
1446	/* operation data area begin */
1447	u8 reserved04[4];
1448	u32 gib_origin;
1449	u8 reserved05[10];
1450	u8 aix;
1451	u8 reserved06[4029];
1452	struct chsc_header response;
1453	u8 reserved07[4];
1454	} *sgib_area;
1455	int ret;
1456
1457	spin_lock_irq(lock: &chsc_page_lock);
1458	memset(chsc_page, 0, PAGE_SIZE);
1459	sgib_area = chsc_page;
1460	sgib_area->request.length = 0x0fe0;
1461	sgib_area->request.code = 0x0021;
1462	sgib_area->op = 0x1;
1463	sgib_area->gib_origin = origin;
1464
1465	ret = chsc(chsc_area: sgib_area);
1466	if (ret == 0)
1467	ret = chsc_error_from_response(sgib_area->response.code);
1468	spin_unlock_irq(lock: &chsc_page_lock);
1469
1470	return ret;
1471	}
1472	EXPORT_SYMBOL_GPL(chsc_sgib);
1473
1474	#define SCUD_REQ_LEN 0x10 /* SCUD request block length */
1475	#define SCUD_REQ_CMD 0x4b /* SCUD Command Code */
1476
1477	struct chse_cudb {
1478	u16 flags:8;
1479	u16 chp_valid:8;
1480	u16 cu;
1481	u32 esm_valid:8;
1482	u32:24;
1483	u8 chpid[8];
1484	u32:32;
1485	u32:32;
1486	u8 esm[8];
1487	u32 efla[8];
1488	} __packed;
1489
1490	struct chsc_scud {
1491	struct chsc_header request;
1492	u16:4;
1493	u16 fmt:4;
1494	u16 cssid:8;
1495	u16 first_cu;
1496	u16:16;
1497	u16 last_cu;
1498	u32:32;
1499	struct chsc_header response;
1500	u16:4;
1501	u16 fmt_resp:4;
1502	u32:24;
1503	struct chse_cudb cudb[];
1504	} __packed;
1505
1506	/**
1507	* chsc_scud() - Store control-unit description.
1508	* @cu: number of the control-unit
1509	* @esm: 8 1-byte endpoint security mode values
1510	* @esm_valid: validity mask for @esm
1511	*
1512	* Interface to retrieve information about the endpoint security
1513	* modes for up to 8 paths of a control unit.
1514	*
1515	* Returns 0 on success.
1516	*/
1517	int chsc_scud(u16 cu, u64 *esm, u8 *esm_valid)
1518	{
1519	struct chsc_scud *scud = chsc_page;
1520	int ret;
1521
1522	spin_lock_irq(lock: &chsc_page_lock);
1523	memset(chsc_page, 0, PAGE_SIZE);
1524	scud->request.length = SCUD_REQ_LEN;
1525	scud->request.code = SCUD_REQ_CMD;
1526	scud->fmt = 0;
1527	scud->cssid = 0;
1528	scud->first_cu = cu;
1529	scud->last_cu = cu;
1530
1531	ret = chsc(chsc_area: scud);
1532	if (!ret)
1533	ret = chsc_error_from_response(scud->response.code);
1534
1535	if (!ret && (scud->response.length <= 8 || scud->fmt_resp != 0
1536	|| !(scud->cudb[0].flags & 0x80)
1537	|| scud->cudb[0].cu != cu)) {
1538
1539	CIO_MSG_EVENT(2, "chsc: scud failed rc=%04x, L2=%04x "
1540	"FMT=%04x, cudb.flags=%02x, cudb.cu=%04x",
1541	scud->response.code, scud->response.length,
1542	scud->fmt_resp, scud->cudb[0].flags, scud->cudb[0].cu);
1543	ret = -EINVAL;
1544	}
1545
1546	if (ret)
1547	goto out;
1548
1549	memcpy(esm, scud->cudb[0].esm, sizeof(*esm));
1550	*esm_valid = scud->cudb[0].esm_valid;
1551	out:
1552	spin_unlock_irq(lock: &chsc_page_lock);
1553	return ret;
1554	}
1555	EXPORT_SYMBOL_GPL(chsc_scud);
1556