Loading...
1/*
2 * drivers/s390/cio/chsc.c
3 * S/390 common I/O routines -- channel subsystem call
4 *
5 * Copyright IBM Corp. 1999,2010
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
19#include <asm/cio.h>
20#include <asm/chpid.h>
21#include <asm/chsc.h>
22#include <asm/crw.h>
23
24#include "css.h"
25#include "cio.h"
26#include "cio_debug.h"
27#include "ioasm.h"
28#include "chp.h"
29#include "chsc.h"
30
31static void *sei_page;
32static void *chsc_page;
33static DEFINE_SPINLOCK(chsc_page_lock);
34
35/**
36 * chsc_error_from_response() - convert a chsc response to an error
37 * @response: chsc response code
38 *
39 * Returns an appropriate Linux error code for @response.
40 */
41int chsc_error_from_response(int response)
42{
43 switch (response) {
44 case 0x0001:
45 return 0;
46 case 0x0002:
47 case 0x0003:
48 case 0x0006:
49 case 0x0007:
50 case 0x0008:
51 case 0x000a:
52 case 0x0104:
53 return -EINVAL;
54 case 0x0004:
55 return -EOPNOTSUPP;
56 default:
57 return -EIO;
58 }
59}
60EXPORT_SYMBOL_GPL(chsc_error_from_response);
61
62struct chsc_ssd_area {
63 struct chsc_header request;
64 u16 :10;
65 u16 ssid:2;
66 u16 :4;
67 u16 f_sch; /* first subchannel */
68 u16 :16;
69 u16 l_sch; /* last subchannel */
70 u32 :32;
71 struct chsc_header response;
72 u32 :32;
73 u8 sch_valid : 1;
74 u8 dev_valid : 1;
75 u8 st : 3; /* subchannel type */
76 u8 zeroes : 3;
77 u8 unit_addr; /* unit address */
78 u16 devno; /* device number */
79 u8 path_mask;
80 u8 fla_valid_mask;
81 u16 sch; /* subchannel */
82 u8 chpid[8]; /* chpids 0-7 */
83 u16 fla[8]; /* full link addresses 0-7 */
84} __attribute__ ((packed));
85
86int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
87{
88 struct chsc_ssd_area *ssd_area;
89 int ccode;
90 int ret;
91 int i;
92 int mask;
93
94 spin_lock_irq(&chsc_page_lock);
95 memset(chsc_page, 0, PAGE_SIZE);
96 ssd_area = chsc_page;
97 ssd_area->request.length = 0x0010;
98 ssd_area->request.code = 0x0004;
99 ssd_area->ssid = schid.ssid;
100 ssd_area->f_sch = schid.sch_no;
101 ssd_area->l_sch = schid.sch_no;
102
103 ccode = chsc(ssd_area);
104 /* Check response. */
105 if (ccode > 0) {
106 ret = (ccode == 3) ? -ENODEV : -EBUSY;
107 goto out;
108 }
109 ret = chsc_error_from_response(ssd_area->response.code);
110 if (ret != 0) {
111 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
112 schid.ssid, schid.sch_no,
113 ssd_area->response.code);
114 goto out;
115 }
116 if (!ssd_area->sch_valid) {
117 ret = -ENODEV;
118 goto out;
119 }
120 /* Copy data */
121 ret = 0;
122 memset(ssd, 0, sizeof(struct chsc_ssd_info));
123 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
124 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
125 goto out;
126 ssd->path_mask = ssd_area->path_mask;
127 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
128 for (i = 0; i < 8; i++) {
129 mask = 0x80 >> i;
130 if (ssd_area->path_mask & mask) {
131 chp_id_init(&ssd->chpid[i]);
132 ssd->chpid[i].id = ssd_area->chpid[i];
133 }
134 if (ssd_area->fla_valid_mask & mask)
135 ssd->fla[i] = ssd_area->fla[i];
136 }
137out:
138 spin_unlock_irq(&chsc_page_lock);
139 return ret;
140}
141
142static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
143{
144 spin_lock_irq(sch->lock);
145 if (sch->driver && sch->driver->chp_event)
146 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
147 goto out_unreg;
148 spin_unlock_irq(sch->lock);
149 return 0;
150
151out_unreg:
152 sch->lpm = 0;
153 spin_unlock_irq(sch->lock);
154 css_schedule_eval(sch->schid);
155 return 0;
156}
157
158void chsc_chp_offline(struct chp_id chpid)
159{
160 char dbf_txt[15];
161 struct chp_link link;
162
163 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
164 CIO_TRACE_EVENT(2, dbf_txt);
165
166 if (chp_get_status(chpid) <= 0)
167 return;
168 memset(&link, 0, sizeof(struct chp_link));
169 link.chpid = chpid;
170 /* Wait until previous actions have settled. */
171 css_wait_for_slow_path();
172 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
173}
174
175static int s390_process_res_acc_new_sch(struct subchannel_id schid, void *data)
176{
177 struct schib schib;
178 /*
179 * We don't know the device yet, but since a path
180 * may be available now to the device we'll have
181 * to do recognition again.
182 * Since we don't have any idea about which chpid
183 * that beast may be on we'll have to do a stsch
184 * on all devices, grr...
185 */
186 if (stsch_err(schid, &schib))
187 /* We're through */
188 return -ENXIO;
189
190 /* Put it on the slow path. */
191 css_schedule_eval(schid);
192 return 0;
193}
194
195static int __s390_process_res_acc(struct subchannel *sch, void *data)
196{
197 spin_lock_irq(sch->lock);
198 if (sch->driver && sch->driver->chp_event)
199 sch->driver->chp_event(sch, data, CHP_ONLINE);
200 spin_unlock_irq(sch->lock);
201
202 return 0;
203}
204
205static void s390_process_res_acc(struct chp_link *link)
206{
207 char dbf_txt[15];
208
209 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
210 link->chpid.id);
211 CIO_TRACE_EVENT( 2, dbf_txt);
212 if (link->fla != 0) {
213 sprintf(dbf_txt, "fla%x", link->fla);
214 CIO_TRACE_EVENT( 2, dbf_txt);
215 }
216 /* Wait until previous actions have settled. */
217 css_wait_for_slow_path();
218 /*
219 * I/O resources may have become accessible.
220 * Scan through all subchannels that may be concerned and
221 * do a validation on those.
222 * The more information we have (info), the less scanning
223 * will we have to do.
224 */
225 for_each_subchannel_staged(__s390_process_res_acc,
226 s390_process_res_acc_new_sch, link);
227}
228
229static int
230__get_chpid_from_lir(void *data)
231{
232 struct lir {
233 u8 iq;
234 u8 ic;
235 u16 sci;
236 /* incident-node descriptor */
237 u32 indesc[28];
238 /* attached-node descriptor */
239 u32 andesc[28];
240 /* incident-specific information */
241 u32 isinfo[28];
242 } __attribute__ ((packed)) *lir;
243
244 lir = data;
245 if (!(lir->iq&0x80))
246 /* NULL link incident record */
247 return -EINVAL;
248 if (!(lir->indesc[0]&0xc0000000))
249 /* node descriptor not valid */
250 return -EINVAL;
251 if (!(lir->indesc[0]&0x10000000))
252 /* don't handle device-type nodes - FIXME */
253 return -EINVAL;
254 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
255
256 return (u16) (lir->indesc[0]&0x000000ff);
257}
258
259struct chsc_sei_area {
260 struct chsc_header request;
261 u32 reserved1;
262 u32 reserved2;
263 u32 reserved3;
264 struct chsc_header response;
265 u32 reserved4;
266 u8 flags;
267 u8 vf; /* validity flags */
268 u8 rs; /* reporting source */
269 u8 cc; /* content code */
270 u16 fla; /* full link address */
271 u16 rsid; /* reporting source id */
272 u32 reserved5;
273 u32 reserved6;
274 u8 ccdf[4096 - 16 - 24]; /* content-code dependent field */
275 /* ccdf has to be big enough for a link-incident record */
276} __attribute__ ((packed));
277
278static void chsc_process_sei_link_incident(struct chsc_sei_area *sei_area)
279{
280 struct chp_id chpid;
281 int id;
282
283 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
284 sei_area->rs, sei_area->rsid);
285 if (sei_area->rs != 4)
286 return;
287 id = __get_chpid_from_lir(sei_area->ccdf);
288 if (id < 0)
289 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
290 else {
291 chp_id_init(&chpid);
292 chpid.id = id;
293 chsc_chp_offline(chpid);
294 }
295}
296
297static void chsc_process_sei_res_acc(struct chsc_sei_area *sei_area)
298{
299 struct chp_link link;
300 struct chp_id chpid;
301 int status;
302
303 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
304 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
305 if (sei_area->rs != 4)
306 return;
307 chp_id_init(&chpid);
308 chpid.id = sei_area->rsid;
309 /* allocate a new channel path structure, if needed */
310 status = chp_get_status(chpid);
311 if (status < 0)
312 chp_new(chpid);
313 else if (!status)
314 return;
315 memset(&link, 0, sizeof(struct chp_link));
316 link.chpid = chpid;
317 if ((sei_area->vf & 0xc0) != 0) {
318 link.fla = sei_area->fla;
319 if ((sei_area->vf & 0xc0) == 0xc0)
320 /* full link address */
321 link.fla_mask = 0xffff;
322 else
323 /* link address */
324 link.fla_mask = 0xff00;
325 }
326 s390_process_res_acc(&link);
327}
328
329static void chsc_process_sei_chp_avail(struct chsc_sei_area *sei_area)
330{
331 struct channel_path *chp;
332 struct chp_id chpid;
333 u8 *data;
334 int num;
335
336 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
337 if (sei_area->rs != 0)
338 return;
339 data = sei_area->ccdf;
340 chp_id_init(&chpid);
341 for (num = 0; num <= __MAX_CHPID; num++) {
342 if (!chp_test_bit(data, num))
343 continue;
344 chpid.id = num;
345
346 CIO_CRW_EVENT(4, "Update information for channel path "
347 "%x.%02x\n", chpid.cssid, chpid.id);
348 chp = chpid_to_chp(chpid);
349 if (!chp) {
350 chp_new(chpid);
351 continue;
352 }
353 mutex_lock(&chp->lock);
354 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
355 mutex_unlock(&chp->lock);
356 }
357}
358
359struct chp_config_data {
360 u8 map[32];
361 u8 op;
362 u8 pc;
363};
364
365static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
366{
367 struct chp_config_data *data;
368 struct chp_id chpid;
369 int num;
370 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
371
372 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
373 if (sei_area->rs != 0)
374 return;
375 data = (struct chp_config_data *) &(sei_area->ccdf);
376 chp_id_init(&chpid);
377 for (num = 0; num <= __MAX_CHPID; num++) {
378 if (!chp_test_bit(data->map, num))
379 continue;
380 chpid.id = num;
381 pr_notice("Processing %s for channel path %x.%02x\n",
382 events[data->op], chpid.cssid, chpid.id);
383 switch (data->op) {
384 case 0:
385 chp_cfg_schedule(chpid, 1);
386 break;
387 case 1:
388 chp_cfg_schedule(chpid, 0);
389 break;
390 case 2:
391 chp_cfg_cancel_deconfigure(chpid);
392 break;
393 }
394 }
395}
396
397static void chsc_process_sei(struct chsc_sei_area *sei_area)
398{
399 /* Check if we might have lost some information. */
400 if (sei_area->flags & 0x40) {
401 CIO_CRW_EVENT(2, "chsc: event overflow\n");
402 css_schedule_eval_all();
403 }
404 /* which kind of information was stored? */
405 switch (sei_area->cc) {
406 case 1: /* link incident*/
407 chsc_process_sei_link_incident(sei_area);
408 break;
409 case 2: /* i/o resource accessibility */
410 chsc_process_sei_res_acc(sei_area);
411 break;
412 case 7: /* channel-path-availability information */
413 chsc_process_sei_chp_avail(sei_area);
414 break;
415 case 8: /* channel-path-configuration notification */
416 chsc_process_sei_chp_config(sei_area);
417 break;
418 default: /* other stuff */
419 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
420 sei_area->cc);
421 break;
422 }
423}
424
425static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
426{
427 struct chsc_sei_area *sei_area;
428
429 if (overflow) {
430 css_schedule_eval_all();
431 return;
432 }
433 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
434 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
435 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
436 crw0->erc, crw0->rsid);
437 if (!sei_page)
438 return;
439 /* Access to sei_page is serialized through machine check handler
440 * thread, so no need for locking. */
441 sei_area = sei_page;
442
443 CIO_TRACE_EVENT(2, "prcss");
444 do {
445 memset(sei_area, 0, sizeof(*sei_area));
446 sei_area->request.length = 0x0010;
447 sei_area->request.code = 0x000e;
448 if (chsc(sei_area))
449 break;
450
451 if (sei_area->response.code == 0x0001) {
452 CIO_CRW_EVENT(4, "chsc: sei successful\n");
453 chsc_process_sei(sei_area);
454 } else {
455 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
456 sei_area->response.code);
457 break;
458 }
459 } while (sei_area->flags & 0x80);
460}
461
462void chsc_chp_online(struct chp_id chpid)
463{
464 char dbf_txt[15];
465 struct chp_link link;
466
467 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
468 CIO_TRACE_EVENT(2, dbf_txt);
469
470 if (chp_get_status(chpid) != 0) {
471 memset(&link, 0, sizeof(struct chp_link));
472 link.chpid = chpid;
473 /* Wait until previous actions have settled. */
474 css_wait_for_slow_path();
475 for_each_subchannel_staged(__s390_process_res_acc, NULL,
476 &link);
477 }
478}
479
480static void __s390_subchannel_vary_chpid(struct subchannel *sch,
481 struct chp_id chpid, int on)
482{
483 unsigned long flags;
484 struct chp_link link;
485
486 memset(&link, 0, sizeof(struct chp_link));
487 link.chpid = chpid;
488 spin_lock_irqsave(sch->lock, flags);
489 if (sch->driver && sch->driver->chp_event)
490 sch->driver->chp_event(sch, &link,
491 on ? CHP_VARY_ON : CHP_VARY_OFF);
492 spin_unlock_irqrestore(sch->lock, flags);
493}
494
495static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
496{
497 struct chp_id *chpid = data;
498
499 __s390_subchannel_vary_chpid(sch, *chpid, 0);
500 return 0;
501}
502
503static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
504{
505 struct chp_id *chpid = data;
506
507 __s390_subchannel_vary_chpid(sch, *chpid, 1);
508 return 0;
509}
510
511static int
512__s390_vary_chpid_on(struct subchannel_id schid, void *data)
513{
514 struct schib schib;
515
516 if (stsch_err(schid, &schib))
517 /* We're through */
518 return -ENXIO;
519 /* Put it on the slow path. */
520 css_schedule_eval(schid);
521 return 0;
522}
523
524/**
525 * chsc_chp_vary - propagate channel-path vary operation to subchannels
526 * @chpid: channl-path ID
527 * @on: non-zero for vary online, zero for vary offline
528 */
529int chsc_chp_vary(struct chp_id chpid, int on)
530{
531 struct channel_path *chp = chpid_to_chp(chpid);
532 struct chp_link link;
533
534 memset(&link, 0, sizeof(struct chp_link));
535 link.chpid = chpid;
536 /* Wait until previous actions have settled. */
537 css_wait_for_slow_path();
538 /*
539 * Redo PathVerification on the devices the chpid connects to
540 */
541 if (on) {
542 /* Try to update the channel path descritor. */
543 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
544 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
545 __s390_vary_chpid_on, &link);
546 } else
547 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
548 NULL, &link);
549
550 return 0;
551}
552
553static void
554chsc_remove_cmg_attr(struct channel_subsystem *css)
555{
556 int i;
557
558 for (i = 0; i <= __MAX_CHPID; i++) {
559 if (!css->chps[i])
560 continue;
561 chp_remove_cmg_attr(css->chps[i]);
562 }
563}
564
565static int
566chsc_add_cmg_attr(struct channel_subsystem *css)
567{
568 int i, ret;
569
570 ret = 0;
571 for (i = 0; i <= __MAX_CHPID; i++) {
572 if (!css->chps[i])
573 continue;
574 ret = chp_add_cmg_attr(css->chps[i]);
575 if (ret)
576 goto cleanup;
577 }
578 return ret;
579cleanup:
580 for (--i; i >= 0; i--) {
581 if (!css->chps[i])
582 continue;
583 chp_remove_cmg_attr(css->chps[i]);
584 }
585 return ret;
586}
587
588int __chsc_do_secm(struct channel_subsystem *css, int enable)
589{
590 struct {
591 struct chsc_header request;
592 u32 operation_code : 2;
593 u32 : 30;
594 u32 key : 4;
595 u32 : 28;
596 u32 zeroes1;
597 u32 cub_addr1;
598 u32 zeroes2;
599 u32 cub_addr2;
600 u32 reserved[13];
601 struct chsc_header response;
602 u32 status : 8;
603 u32 : 4;
604 u32 fmt : 4;
605 u32 : 16;
606 } __attribute__ ((packed)) *secm_area;
607 int ret, ccode;
608
609 spin_lock_irq(&chsc_page_lock);
610 memset(chsc_page, 0, PAGE_SIZE);
611 secm_area = chsc_page;
612 secm_area->request.length = 0x0050;
613 secm_area->request.code = 0x0016;
614
615 secm_area->key = PAGE_DEFAULT_KEY >> 4;
616 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
617 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
618
619 secm_area->operation_code = enable ? 0 : 1;
620
621 ccode = chsc(secm_area);
622 if (ccode > 0) {
623 ret = (ccode == 3) ? -ENODEV : -EBUSY;
624 goto out;
625 }
626
627 switch (secm_area->response.code) {
628 case 0x0102:
629 case 0x0103:
630 ret = -EINVAL;
631 break;
632 default:
633 ret = chsc_error_from_response(secm_area->response.code);
634 }
635 if (ret != 0)
636 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
637 secm_area->response.code);
638out:
639 spin_unlock_irq(&chsc_page_lock);
640 return ret;
641}
642
643int
644chsc_secm(struct channel_subsystem *css, int enable)
645{
646 int ret;
647
648 if (enable && !css->cm_enabled) {
649 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
650 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
651 if (!css->cub_addr1 || !css->cub_addr2) {
652 free_page((unsigned long)css->cub_addr1);
653 free_page((unsigned long)css->cub_addr2);
654 return -ENOMEM;
655 }
656 }
657 ret = __chsc_do_secm(css, enable);
658 if (!ret) {
659 css->cm_enabled = enable;
660 if (css->cm_enabled) {
661 ret = chsc_add_cmg_attr(css);
662 if (ret) {
663 __chsc_do_secm(css, 0);
664 css->cm_enabled = 0;
665 }
666 } else
667 chsc_remove_cmg_attr(css);
668 }
669 if (!css->cm_enabled) {
670 free_page((unsigned long)css->cub_addr1);
671 free_page((unsigned long)css->cub_addr2);
672 }
673 return ret;
674}
675
676int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
677 int c, int m, void *page)
678{
679 struct chsc_scpd *scpd_area;
680 int ccode, ret;
681
682 if ((rfmt == 1) && !css_general_characteristics.fcs)
683 return -EINVAL;
684 if ((rfmt == 2) && !css_general_characteristics.cib)
685 return -EINVAL;
686
687 memset(page, 0, PAGE_SIZE);
688 scpd_area = page;
689 scpd_area->request.length = 0x0010;
690 scpd_area->request.code = 0x0002;
691 scpd_area->cssid = chpid.cssid;
692 scpd_area->first_chpid = chpid.id;
693 scpd_area->last_chpid = chpid.id;
694 scpd_area->m = m;
695 scpd_area->c = c;
696 scpd_area->fmt = fmt;
697 scpd_area->rfmt = rfmt;
698
699 ccode = chsc(scpd_area);
700 if (ccode > 0)
701 return (ccode == 3) ? -ENODEV : -EBUSY;
702
703 ret = chsc_error_from_response(scpd_area->response.code);
704 if (ret)
705 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
706 scpd_area->response.code);
707 return ret;
708}
709EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
710
711int chsc_determine_base_channel_path_desc(struct chp_id chpid,
712 struct channel_path_desc *desc)
713{
714 struct chsc_response_struct *chsc_resp;
715 struct chsc_scpd *scpd_area;
716 unsigned long flags;
717 int ret;
718
719 spin_lock_irqsave(&chsc_page_lock, flags);
720 scpd_area = chsc_page;
721 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
722 if (ret)
723 goto out;
724 chsc_resp = (void *)&scpd_area->response;
725 memcpy(desc, &chsc_resp->data, sizeof(*desc));
726out:
727 spin_unlock_irqrestore(&chsc_page_lock, flags);
728 return ret;
729}
730
731int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
732 struct channel_path_desc_fmt1 *desc)
733{
734 struct chsc_response_struct *chsc_resp;
735 struct chsc_scpd *scpd_area;
736 int ret;
737
738 spin_lock_irq(&chsc_page_lock);
739 scpd_area = chsc_page;
740 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
741 if (ret)
742 goto out;
743 chsc_resp = (void *)&scpd_area->response;
744 memcpy(desc, &chsc_resp->data, sizeof(*desc));
745out:
746 spin_unlock_irq(&chsc_page_lock);
747 return ret;
748}
749
750static void
751chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
752 struct cmg_chars *chars)
753{
754 struct cmg_chars *cmg_chars;
755 int i, mask;
756
757 cmg_chars = chp->cmg_chars;
758 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
759 mask = 0x80 >> (i + 3);
760 if (cmcv & mask)
761 cmg_chars->values[i] = chars->values[i];
762 else
763 cmg_chars->values[i] = 0;
764 }
765}
766
767int chsc_get_channel_measurement_chars(struct channel_path *chp)
768{
769 struct cmg_chars *cmg_chars;
770 int ccode, ret;
771
772 struct {
773 struct chsc_header request;
774 u32 : 24;
775 u32 first_chpid : 8;
776 u32 : 24;
777 u32 last_chpid : 8;
778 u32 zeroes1;
779 struct chsc_header response;
780 u32 zeroes2;
781 u32 not_valid : 1;
782 u32 shared : 1;
783 u32 : 22;
784 u32 chpid : 8;
785 u32 cmcv : 5;
786 u32 : 11;
787 u32 cmgq : 8;
788 u32 cmg : 8;
789 u32 zeroes3;
790 u32 data[NR_MEASUREMENT_CHARS];
791 } __attribute__ ((packed)) *scmc_area;
792
793 chp->cmg_chars = NULL;
794 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
795 if (!cmg_chars)
796 return -ENOMEM;
797
798 spin_lock_irq(&chsc_page_lock);
799 memset(chsc_page, 0, PAGE_SIZE);
800 scmc_area = chsc_page;
801 scmc_area->request.length = 0x0010;
802 scmc_area->request.code = 0x0022;
803 scmc_area->first_chpid = chp->chpid.id;
804 scmc_area->last_chpid = chp->chpid.id;
805
806 ccode = chsc(scmc_area);
807 if (ccode > 0) {
808 ret = (ccode == 3) ? -ENODEV : -EBUSY;
809 goto out;
810 }
811
812 ret = chsc_error_from_response(scmc_area->response.code);
813 if (ret) {
814 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
815 scmc_area->response.code);
816 goto out;
817 }
818 if (scmc_area->not_valid) {
819 chp->cmg = -1;
820 chp->shared = -1;
821 goto out;
822 }
823 chp->cmg = scmc_area->cmg;
824 chp->shared = scmc_area->shared;
825 if (chp->cmg != 2 && chp->cmg != 3) {
826 /* No cmg-dependent data. */
827 goto out;
828 }
829 chp->cmg_chars = cmg_chars;
830 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
831 (struct cmg_chars *) &scmc_area->data);
832out:
833 spin_unlock_irq(&chsc_page_lock);
834 if (!chp->cmg_chars)
835 kfree(cmg_chars);
836
837 return ret;
838}
839
840int __init chsc_init(void)
841{
842 int ret;
843
844 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
845 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
846 if (!sei_page || !chsc_page) {
847 ret = -ENOMEM;
848 goto out_err;
849 }
850 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
851 if (ret)
852 goto out_err;
853 return ret;
854out_err:
855 free_page((unsigned long)chsc_page);
856 free_page((unsigned long)sei_page);
857 return ret;
858}
859
860void __init chsc_init_cleanup(void)
861{
862 crw_unregister_handler(CRW_RSC_CSS);
863 free_page((unsigned long)chsc_page);
864 free_page((unsigned long)sei_page);
865}
866
867int chsc_enable_facility(int operation_code)
868{
869 unsigned long flags;
870 int ret;
871 struct {
872 struct chsc_header request;
873 u8 reserved1:4;
874 u8 format:4;
875 u8 reserved2;
876 u16 operation_code;
877 u32 reserved3;
878 u32 reserved4;
879 u32 operation_data_area[252];
880 struct chsc_header response;
881 u32 reserved5:4;
882 u32 format2:4;
883 u32 reserved6:24;
884 } __attribute__ ((packed)) *sda_area;
885
886 spin_lock_irqsave(&chsc_page_lock, flags);
887 memset(chsc_page, 0, PAGE_SIZE);
888 sda_area = chsc_page;
889 sda_area->request.length = 0x0400;
890 sda_area->request.code = 0x0031;
891 sda_area->operation_code = operation_code;
892
893 ret = chsc(sda_area);
894 if (ret > 0) {
895 ret = (ret == 3) ? -ENODEV : -EBUSY;
896 goto out;
897 }
898
899 switch (sda_area->response.code) {
900 case 0x0101:
901 ret = -EOPNOTSUPP;
902 break;
903 default:
904 ret = chsc_error_from_response(sda_area->response.code);
905 }
906 if (ret != 0)
907 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
908 operation_code, sda_area->response.code);
909out:
910 spin_unlock_irqrestore(&chsc_page_lock, flags);
911 return ret;
912}
913
914struct css_general_char css_general_characteristics;
915struct css_chsc_char css_chsc_characteristics;
916
917int __init
918chsc_determine_css_characteristics(void)
919{
920 int result;
921 struct {
922 struct chsc_header request;
923 u32 reserved1;
924 u32 reserved2;
925 u32 reserved3;
926 struct chsc_header response;
927 u32 reserved4;
928 u32 general_char[510];
929 u32 chsc_char[508];
930 } __attribute__ ((packed)) *scsc_area;
931
932 spin_lock_irq(&chsc_page_lock);
933 memset(chsc_page, 0, PAGE_SIZE);
934 scsc_area = chsc_page;
935 scsc_area->request.length = 0x0010;
936 scsc_area->request.code = 0x0010;
937
938 result = chsc(scsc_area);
939 if (result) {
940 result = (result == 3) ? -ENODEV : -EBUSY;
941 goto exit;
942 }
943
944 result = chsc_error_from_response(scsc_area->response.code);
945 if (result == 0) {
946 memcpy(&css_general_characteristics, scsc_area->general_char,
947 sizeof(css_general_characteristics));
948 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
949 sizeof(css_chsc_characteristics));
950 } else
951 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
952 scsc_area->response.code);
953exit:
954 spin_unlock_irq(&chsc_page_lock);
955 return result;
956}
957
958EXPORT_SYMBOL_GPL(css_general_characteristics);
959EXPORT_SYMBOL_GPL(css_chsc_characteristics);
960
961int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
962{
963 struct {
964 struct chsc_header request;
965 unsigned int rsvd0;
966 unsigned int op : 8;
967 unsigned int rsvd1 : 8;
968 unsigned int ctrl : 16;
969 unsigned int rsvd2[5];
970 struct chsc_header response;
971 unsigned int rsvd3[7];
972 } __attribute__ ((packed)) *rr;
973 int rc;
974
975 memset(page, 0, PAGE_SIZE);
976 rr = page;
977 rr->request.length = 0x0020;
978 rr->request.code = 0x0033;
979 rr->op = op;
980 rr->ctrl = ctrl;
981 rc = chsc(rr);
982 if (rc)
983 return -EIO;
984 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
985 return rc;
986}
987
988int chsc_sstpi(void *page, void *result, size_t size)
989{
990 struct {
991 struct chsc_header request;
992 unsigned int rsvd0[3];
993 struct chsc_header response;
994 char data[size];
995 } __attribute__ ((packed)) *rr;
996 int rc;
997
998 memset(page, 0, PAGE_SIZE);
999 rr = page;
1000 rr->request.length = 0x0010;
1001 rr->request.code = 0x0038;
1002 rc = chsc(rr);
1003 if (rc)
1004 return -EIO;
1005 memcpy(result, &rr->data, size);
1006 return (rr->response.code == 0x0001) ? 0 : -EIO;
1007}
1008
1009int chsc_siosl(struct subchannel_id schid)
1010{
1011 struct {
1012 struct chsc_header request;
1013 u32 word1;
1014 struct subchannel_id sid;
1015 u32 word3;
1016 struct chsc_header response;
1017 u32 word[11];
1018 } __attribute__ ((packed)) *siosl_area;
1019 unsigned long flags;
1020 int ccode;
1021 int rc;
1022
1023 spin_lock_irqsave(&chsc_page_lock, flags);
1024 memset(chsc_page, 0, PAGE_SIZE);
1025 siosl_area = chsc_page;
1026 siosl_area->request.length = 0x0010;
1027 siosl_area->request.code = 0x0046;
1028 siosl_area->word1 = 0x80000000;
1029 siosl_area->sid = schid;
1030
1031 ccode = chsc(siosl_area);
1032 if (ccode > 0) {
1033 if (ccode == 3)
1034 rc = -ENODEV;
1035 else
1036 rc = -EBUSY;
1037 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1038 schid.ssid, schid.sch_no, ccode);
1039 goto out;
1040 }
1041 rc = chsc_error_from_response(siosl_area->response.code);
1042 if (rc)
1043 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1044 schid.ssid, schid.sch_no,
1045 siosl_area->response.code);
1046 else
1047 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1048 schid.ssid, schid.sch_no);
1049out:
1050 spin_unlock_irqrestore(&chsc_page_lock, flags);
1051 return rc;
1052}
1053EXPORT_SYMBOL_GPL(chsc_siosl);
1/*
2 * S/390 common I/O routines -- channel subsystem call
3 *
4 * Copyright IBM Corp. 1999,2012
5 * Author(s): Ingo Adlung (adlung@de.ibm.com)
6 * Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Arnd Bergmann (arndb@de.ibm.com)
8 */
9
10#define KMSG_COMPONENT "cio"
11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/pci.h>
18
19#include <asm/cio.h>
20#include <asm/chpid.h>
21#include <asm/chsc.h>
22#include <asm/crw.h>
23#include <asm/isc.h>
24
25#include "css.h"
26#include "cio.h"
27#include "cio_debug.h"
28#include "ioasm.h"
29#include "chp.h"
30#include "chsc.h"
31
32static void *sei_page;
33static void *chsc_page;
34static DEFINE_SPINLOCK(chsc_page_lock);
35
36/**
37 * chsc_error_from_response() - convert a chsc response to an error
38 * @response: chsc response code
39 *
40 * Returns an appropriate Linux error code for @response.
41 */
42int chsc_error_from_response(int response)
43{
44 switch (response) {
45 case 0x0001:
46 return 0;
47 case 0x0002:
48 case 0x0003:
49 case 0x0006:
50 case 0x0007:
51 case 0x0008:
52 case 0x000a:
53 case 0x0104:
54 return -EINVAL;
55 case 0x0004:
56 return -EOPNOTSUPP;
57 case 0x000b:
58 case 0x0107: /* "Channel busy" for the op 0x003d */
59 return -EBUSY;
60 case 0x0100:
61 case 0x0102:
62 return -ENOMEM;
63 default:
64 return -EIO;
65 }
66}
67EXPORT_SYMBOL_GPL(chsc_error_from_response);
68
69struct chsc_ssd_area {
70 struct chsc_header request;
71 u16 :10;
72 u16 ssid:2;
73 u16 :4;
74 u16 f_sch; /* first subchannel */
75 u16 :16;
76 u16 l_sch; /* last subchannel */
77 u32 :32;
78 struct chsc_header response;
79 u32 :32;
80 u8 sch_valid : 1;
81 u8 dev_valid : 1;
82 u8 st : 3; /* subchannel type */
83 u8 zeroes : 3;
84 u8 unit_addr; /* unit address */
85 u16 devno; /* device number */
86 u8 path_mask;
87 u8 fla_valid_mask;
88 u16 sch; /* subchannel */
89 u8 chpid[8]; /* chpids 0-7 */
90 u16 fla[8]; /* full link addresses 0-7 */
91} __attribute__ ((packed));
92
93int chsc_get_ssd_info(struct subchannel_id schid, struct chsc_ssd_info *ssd)
94{
95 struct chsc_ssd_area *ssd_area;
96 int ccode;
97 int ret;
98 int i;
99 int mask;
100
101 spin_lock_irq(&chsc_page_lock);
102 memset(chsc_page, 0, PAGE_SIZE);
103 ssd_area = chsc_page;
104 ssd_area->request.length = 0x0010;
105 ssd_area->request.code = 0x0004;
106 ssd_area->ssid = schid.ssid;
107 ssd_area->f_sch = schid.sch_no;
108 ssd_area->l_sch = schid.sch_no;
109
110 ccode = chsc(ssd_area);
111 /* Check response. */
112 if (ccode > 0) {
113 ret = (ccode == 3) ? -ENODEV : -EBUSY;
114 goto out;
115 }
116 ret = chsc_error_from_response(ssd_area->response.code);
117 if (ret != 0) {
118 CIO_MSG_EVENT(2, "chsc: ssd failed for 0.%x.%04x (rc=%04x)\n",
119 schid.ssid, schid.sch_no,
120 ssd_area->response.code);
121 goto out;
122 }
123 if (!ssd_area->sch_valid) {
124 ret = -ENODEV;
125 goto out;
126 }
127 /* Copy data */
128 ret = 0;
129 memset(ssd, 0, sizeof(struct chsc_ssd_info));
130 if ((ssd_area->st != SUBCHANNEL_TYPE_IO) &&
131 (ssd_area->st != SUBCHANNEL_TYPE_MSG))
132 goto out;
133 ssd->path_mask = ssd_area->path_mask;
134 ssd->fla_valid_mask = ssd_area->fla_valid_mask;
135 for (i = 0; i < 8; i++) {
136 mask = 0x80 >> i;
137 if (ssd_area->path_mask & mask) {
138 chp_id_init(&ssd->chpid[i]);
139 ssd->chpid[i].id = ssd_area->chpid[i];
140 }
141 if (ssd_area->fla_valid_mask & mask)
142 ssd->fla[i] = ssd_area->fla[i];
143 }
144out:
145 spin_unlock_irq(&chsc_page_lock);
146 return ret;
147}
148
149/**
150 * chsc_ssqd() - store subchannel QDIO data (SSQD)
151 * @schid: id of the subchannel on which SSQD is performed
152 * @ssqd: request and response block for SSQD
153 *
154 * Returns 0 on success.
155 */
156int chsc_ssqd(struct subchannel_id schid, struct chsc_ssqd_area *ssqd)
157{
158 memset(ssqd, 0, sizeof(*ssqd));
159 ssqd->request.length = 0x0010;
160 ssqd->request.code = 0x0024;
161 ssqd->first_sch = schid.sch_no;
162 ssqd->last_sch = schid.sch_no;
163 ssqd->ssid = schid.ssid;
164
165 if (chsc(ssqd))
166 return -EIO;
167
168 return chsc_error_from_response(ssqd->response.code);
169}
170EXPORT_SYMBOL_GPL(chsc_ssqd);
171
172/**
173 * chsc_sadc() - set adapter device controls (SADC)
174 * @schid: id of the subchannel on which SADC is performed
175 * @scssc: request and response block for SADC
176 * @summary_indicator_addr: summary indicator address
177 * @subchannel_indicator_addr: subchannel indicator address
178 *
179 * Returns 0 on success.
180 */
181int chsc_sadc(struct subchannel_id schid, struct chsc_scssc_area *scssc,
182 u64 summary_indicator_addr, u64 subchannel_indicator_addr)
183{
184 memset(scssc, 0, sizeof(*scssc));
185 scssc->request.length = 0x0fe0;
186 scssc->request.code = 0x0021;
187 scssc->operation_code = 0;
188
189 scssc->summary_indicator_addr = summary_indicator_addr;
190 scssc->subchannel_indicator_addr = subchannel_indicator_addr;
191
192 scssc->ks = PAGE_DEFAULT_KEY >> 4;
193 scssc->kc = PAGE_DEFAULT_KEY >> 4;
194 scssc->isc = QDIO_AIRQ_ISC;
195 scssc->schid = schid;
196
197 /* enable the time delay disablement facility */
198 if (css_general_characteristics.aif_tdd)
199 scssc->word_with_d_bit = 0x10000000;
200
201 if (chsc(scssc))
202 return -EIO;
203
204 return chsc_error_from_response(scssc->response.code);
205}
206EXPORT_SYMBOL_GPL(chsc_sadc);
207
208static int s390_subchannel_remove_chpid(struct subchannel *sch, void *data)
209{
210 spin_lock_irq(sch->lock);
211 if (sch->driver && sch->driver->chp_event)
212 if (sch->driver->chp_event(sch, data, CHP_OFFLINE) != 0)
213 goto out_unreg;
214 spin_unlock_irq(sch->lock);
215 return 0;
216
217out_unreg:
218 sch->lpm = 0;
219 spin_unlock_irq(sch->lock);
220 css_schedule_eval(sch->schid);
221 return 0;
222}
223
224void chsc_chp_offline(struct chp_id chpid)
225{
226 char dbf_txt[15];
227 struct chp_link link;
228
229 sprintf(dbf_txt, "chpr%x.%02x", chpid.cssid, chpid.id);
230 CIO_TRACE_EVENT(2, dbf_txt);
231
232 if (chp_get_status(chpid) <= 0)
233 return;
234 memset(&link, 0, sizeof(struct chp_link));
235 link.chpid = chpid;
236 /* Wait until previous actions have settled. */
237 css_wait_for_slow_path();
238 for_each_subchannel_staged(s390_subchannel_remove_chpid, NULL, &link);
239}
240
241static int __s390_process_res_acc(struct subchannel *sch, void *data)
242{
243 spin_lock_irq(sch->lock);
244 if (sch->driver && sch->driver->chp_event)
245 sch->driver->chp_event(sch, data, CHP_ONLINE);
246 spin_unlock_irq(sch->lock);
247
248 return 0;
249}
250
251static void s390_process_res_acc(struct chp_link *link)
252{
253 char dbf_txt[15];
254
255 sprintf(dbf_txt, "accpr%x.%02x", link->chpid.cssid,
256 link->chpid.id);
257 CIO_TRACE_EVENT( 2, dbf_txt);
258 if (link->fla != 0) {
259 sprintf(dbf_txt, "fla%x", link->fla);
260 CIO_TRACE_EVENT( 2, dbf_txt);
261 }
262 /* Wait until previous actions have settled. */
263 css_wait_for_slow_path();
264 /*
265 * I/O resources may have become accessible.
266 * Scan through all subchannels that may be concerned and
267 * do a validation on those.
268 * The more information we have (info), the less scanning
269 * will we have to do.
270 */
271 for_each_subchannel_staged(__s390_process_res_acc, NULL, link);
272 css_schedule_reprobe();
273}
274
275static int
276__get_chpid_from_lir(void *data)
277{
278 struct lir {
279 u8 iq;
280 u8 ic;
281 u16 sci;
282 /* incident-node descriptor */
283 u32 indesc[28];
284 /* attached-node descriptor */
285 u32 andesc[28];
286 /* incident-specific information */
287 u32 isinfo[28];
288 } __attribute__ ((packed)) *lir;
289
290 lir = data;
291 if (!(lir->iq&0x80))
292 /* NULL link incident record */
293 return -EINVAL;
294 if (!(lir->indesc[0]&0xc0000000))
295 /* node descriptor not valid */
296 return -EINVAL;
297 if (!(lir->indesc[0]&0x10000000))
298 /* don't handle device-type nodes - FIXME */
299 return -EINVAL;
300 /* Byte 3 contains the chpid. Could also be CTCA, but we don't care */
301
302 return (u16) (lir->indesc[0]&0x000000ff);
303}
304
305struct chsc_sei_nt0_area {
306 u8 flags;
307 u8 vf; /* validity flags */
308 u8 rs; /* reporting source */
309 u8 cc; /* content code */
310 u16 fla; /* full link address */
311 u16 rsid; /* reporting source id */
312 u32 reserved1;
313 u32 reserved2;
314 /* ccdf has to be big enough for a link-incident record */
315 u8 ccdf[PAGE_SIZE - 24 - 16]; /* content-code dependent field */
316} __packed;
317
318struct chsc_sei_nt2_area {
319 u8 flags; /* p and v bit */
320 u8 reserved1;
321 u8 reserved2;
322 u8 cc; /* content code */
323 u32 reserved3[13];
324 u8 ccdf[PAGE_SIZE - 24 - 56]; /* content-code dependent field */
325} __packed;
326
327#define CHSC_SEI_NT0 (1ULL << 63)
328#define CHSC_SEI_NT2 (1ULL << 61)
329
330struct chsc_sei {
331 struct chsc_header request;
332 u32 reserved1;
333 u64 ntsm; /* notification type mask */
334 struct chsc_header response;
335 u32 :24;
336 u8 nt;
337 union {
338 struct chsc_sei_nt0_area nt0_area;
339 struct chsc_sei_nt2_area nt2_area;
340 u8 nt_area[PAGE_SIZE - 24];
341 } u;
342} __packed;
343
344static void chsc_process_sei_link_incident(struct chsc_sei_nt0_area *sei_area)
345{
346 struct chp_id chpid;
347 int id;
348
349 CIO_CRW_EVENT(4, "chsc: link incident (rs=%02x, rs_id=%04x)\n",
350 sei_area->rs, sei_area->rsid);
351 if (sei_area->rs != 4)
352 return;
353 id = __get_chpid_from_lir(sei_area->ccdf);
354 if (id < 0)
355 CIO_CRW_EVENT(4, "chsc: link incident - invalid LIR\n");
356 else {
357 chp_id_init(&chpid);
358 chpid.id = id;
359 chsc_chp_offline(chpid);
360 }
361}
362
363static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area)
364{
365 struct chp_link link;
366 struct chp_id chpid;
367 int status;
368
369 CIO_CRW_EVENT(4, "chsc: resource accessibility event (rs=%02x, "
370 "rs_id=%04x)\n", sei_area->rs, sei_area->rsid);
371 if (sei_area->rs != 4)
372 return;
373 chp_id_init(&chpid);
374 chpid.id = sei_area->rsid;
375 /* allocate a new channel path structure, if needed */
376 status = chp_get_status(chpid);
377 if (status < 0)
378 chp_new(chpid);
379 else if (!status)
380 return;
381 memset(&link, 0, sizeof(struct chp_link));
382 link.chpid = chpid;
383 if ((sei_area->vf & 0xc0) != 0) {
384 link.fla = sei_area->fla;
385 if ((sei_area->vf & 0xc0) == 0xc0)
386 /* full link address */
387 link.fla_mask = 0xffff;
388 else
389 /* link address */
390 link.fla_mask = 0xff00;
391 }
392 s390_process_res_acc(&link);
393}
394
395static void chsc_process_sei_chp_avail(struct chsc_sei_nt0_area *sei_area)
396{
397 struct channel_path *chp;
398 struct chp_id chpid;
399 u8 *data;
400 int num;
401
402 CIO_CRW_EVENT(4, "chsc: channel path availability information\n");
403 if (sei_area->rs != 0)
404 return;
405 data = sei_area->ccdf;
406 chp_id_init(&chpid);
407 for (num = 0; num <= __MAX_CHPID; num++) {
408 if (!chp_test_bit(data, num))
409 continue;
410 chpid.id = num;
411
412 CIO_CRW_EVENT(4, "Update information for channel path "
413 "%x.%02x\n", chpid.cssid, chpid.id);
414 chp = chpid_to_chp(chpid);
415 if (!chp) {
416 chp_new(chpid);
417 continue;
418 }
419 mutex_lock(&chp->lock);
420 chp_update_desc(chp);
421 mutex_unlock(&chp->lock);
422 }
423}
424
425struct chp_config_data {
426 u8 map[32];
427 u8 op;
428 u8 pc;
429};
430
431static void chsc_process_sei_chp_config(struct chsc_sei_nt0_area *sei_area)
432{
433 struct chp_config_data *data;
434 struct chp_id chpid;
435 int num;
436 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
437
438 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
439 if (sei_area->rs != 0)
440 return;
441 data = (struct chp_config_data *) &(sei_area->ccdf);
442 chp_id_init(&chpid);
443 for (num = 0; num <= __MAX_CHPID; num++) {
444 if (!chp_test_bit(data->map, num))
445 continue;
446 chpid.id = num;
447 pr_notice("Processing %s for channel path %x.%02x\n",
448 events[data->op], chpid.cssid, chpid.id);
449 switch (data->op) {
450 case 0:
451 chp_cfg_schedule(chpid, 1);
452 break;
453 case 1:
454 chp_cfg_schedule(chpid, 0);
455 break;
456 case 2:
457 chp_cfg_cancel_deconfigure(chpid);
458 break;
459 }
460 }
461}
462
463static void chsc_process_sei_scm_change(struct chsc_sei_nt0_area *sei_area)
464{
465 int ret;
466
467 CIO_CRW_EVENT(4, "chsc: scm change notification\n");
468 if (sei_area->rs != 7)
469 return;
470
471 ret = scm_update_information();
472 if (ret)
473 CIO_CRW_EVENT(0, "chsc: updating change notification"
474 " failed (rc=%d).\n", ret);
475}
476
477static void chsc_process_sei_scm_avail(struct chsc_sei_nt0_area *sei_area)
478{
479 int ret;
480
481 CIO_CRW_EVENT(4, "chsc: scm available information\n");
482 if (sei_area->rs != 7)
483 return;
484
485 ret = scm_process_availability_information();
486 if (ret)
487 CIO_CRW_EVENT(0, "chsc: process availability information"
488 " failed (rc=%d).\n", ret);
489}
490
491static void chsc_process_sei_nt2(struct chsc_sei_nt2_area *sei_area)
492{
493 switch (sei_area->cc) {
494 case 1:
495 zpci_event_error(sei_area->ccdf);
496 break;
497 case 2:
498 zpci_event_availability(sei_area->ccdf);
499 break;
500 default:
501 CIO_CRW_EVENT(2, "chsc: sei nt2 unhandled cc=%d\n",
502 sei_area->cc);
503 break;
504 }
505}
506
507static void chsc_process_sei_nt0(struct chsc_sei_nt0_area *sei_area)
508{
509 /* which kind of information was stored? */
510 switch (sei_area->cc) {
511 case 1: /* link incident*/
512 chsc_process_sei_link_incident(sei_area);
513 break;
514 case 2: /* i/o resource accessibility */
515 chsc_process_sei_res_acc(sei_area);
516 break;
517 case 7: /* channel-path-availability information */
518 chsc_process_sei_chp_avail(sei_area);
519 break;
520 case 8: /* channel-path-configuration notification */
521 chsc_process_sei_chp_config(sei_area);
522 break;
523 case 12: /* scm change notification */
524 chsc_process_sei_scm_change(sei_area);
525 break;
526 case 14: /* scm available notification */
527 chsc_process_sei_scm_avail(sei_area);
528 break;
529 default: /* other stuff */
530 CIO_CRW_EVENT(2, "chsc: sei nt0 unhandled cc=%d\n",
531 sei_area->cc);
532 break;
533 }
534
535 /* Check if we might have lost some information. */
536 if (sei_area->flags & 0x40) {
537 CIO_CRW_EVENT(2, "chsc: event overflow\n");
538 css_schedule_eval_all();
539 }
540}
541
542static void chsc_process_event_information(struct chsc_sei *sei, u64 ntsm)
543{
544 static int ntsm_unsupported;
545
546 while (true) {
547 memset(sei, 0, sizeof(*sei));
548 sei->request.length = 0x0010;
549 sei->request.code = 0x000e;
550 if (!ntsm_unsupported)
551 sei->ntsm = ntsm;
552
553 if (chsc(sei))
554 break;
555
556 if (sei->response.code != 0x0001) {
557 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x, ntsm=%llx)\n",
558 sei->response.code, sei->ntsm);
559
560 if (sei->response.code == 3 && sei->ntsm) {
561 /* Fallback for old firmware. */
562 ntsm_unsupported = 1;
563 continue;
564 }
565 break;
566 }
567
568 CIO_CRW_EVENT(2, "chsc: sei successful (nt=%d)\n", sei->nt);
569 switch (sei->nt) {
570 case 0:
571 chsc_process_sei_nt0(&sei->u.nt0_area);
572 break;
573 case 2:
574 chsc_process_sei_nt2(&sei->u.nt2_area);
575 break;
576 default:
577 CIO_CRW_EVENT(2, "chsc: unhandled nt: %d\n", sei->nt);
578 break;
579 }
580
581 if (!(sei->u.nt0_area.flags & 0x80))
582 break;
583 }
584}
585
586/*
587 * Handle channel subsystem related CRWs.
588 * Use store event information to find out what's going on.
589 *
590 * Note: Access to sei_page is serialized through machine check handler
591 * thread, so no need for locking.
592 */
593static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
594{
595 struct chsc_sei *sei = sei_page;
596
597 if (overflow) {
598 css_schedule_eval_all();
599 return;
600 }
601 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
602 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
603 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
604 crw0->erc, crw0->rsid);
605
606 CIO_TRACE_EVENT(2, "prcss");
607 chsc_process_event_information(sei, CHSC_SEI_NT0 | CHSC_SEI_NT2);
608}
609
610void chsc_chp_online(struct chp_id chpid)
611{
612 char dbf_txt[15];
613 struct chp_link link;
614
615 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
616 CIO_TRACE_EVENT(2, dbf_txt);
617
618 if (chp_get_status(chpid) != 0) {
619 memset(&link, 0, sizeof(struct chp_link));
620 link.chpid = chpid;
621 /* Wait until previous actions have settled. */
622 css_wait_for_slow_path();
623 for_each_subchannel_staged(__s390_process_res_acc, NULL,
624 &link);
625 css_schedule_reprobe();
626 }
627}
628
629static void __s390_subchannel_vary_chpid(struct subchannel *sch,
630 struct chp_id chpid, int on)
631{
632 unsigned long flags;
633 struct chp_link link;
634
635 memset(&link, 0, sizeof(struct chp_link));
636 link.chpid = chpid;
637 spin_lock_irqsave(sch->lock, flags);
638 if (sch->driver && sch->driver->chp_event)
639 sch->driver->chp_event(sch, &link,
640 on ? CHP_VARY_ON : CHP_VARY_OFF);
641 spin_unlock_irqrestore(sch->lock, flags);
642}
643
644static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
645{
646 struct chp_id *chpid = data;
647
648 __s390_subchannel_vary_chpid(sch, *chpid, 0);
649 return 0;
650}
651
652static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
653{
654 struct chp_id *chpid = data;
655
656 __s390_subchannel_vary_chpid(sch, *chpid, 1);
657 return 0;
658}
659
660/**
661 * chsc_chp_vary - propagate channel-path vary operation to subchannels
662 * @chpid: channl-path ID
663 * @on: non-zero for vary online, zero for vary offline
664 */
665int chsc_chp_vary(struct chp_id chpid, int on)
666{
667 struct channel_path *chp = chpid_to_chp(chpid);
668
669 /* Wait until previous actions have settled. */
670 css_wait_for_slow_path();
671 /*
672 * Redo PathVerification on the devices the chpid connects to
673 */
674 if (on) {
675 /* Try to update the channel path description. */
676 chp_update_desc(chp);
677 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
678 NULL, &chpid);
679 css_schedule_reprobe();
680 } else
681 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
682 NULL, &chpid);
683
684 return 0;
685}
686
687static void
688chsc_remove_cmg_attr(struct channel_subsystem *css)
689{
690 int i;
691
692 for (i = 0; i <= __MAX_CHPID; i++) {
693 if (!css->chps[i])
694 continue;
695 chp_remove_cmg_attr(css->chps[i]);
696 }
697}
698
699static int
700chsc_add_cmg_attr(struct channel_subsystem *css)
701{
702 int i, ret;
703
704 ret = 0;
705 for (i = 0; i <= __MAX_CHPID; i++) {
706 if (!css->chps[i])
707 continue;
708 ret = chp_add_cmg_attr(css->chps[i]);
709 if (ret)
710 goto cleanup;
711 }
712 return ret;
713cleanup:
714 for (--i; i >= 0; i--) {
715 if (!css->chps[i])
716 continue;
717 chp_remove_cmg_attr(css->chps[i]);
718 }
719 return ret;
720}
721
722int __chsc_do_secm(struct channel_subsystem *css, int enable)
723{
724 struct {
725 struct chsc_header request;
726 u32 operation_code : 2;
727 u32 : 30;
728 u32 key : 4;
729 u32 : 28;
730 u32 zeroes1;
731 u32 cub_addr1;
732 u32 zeroes2;
733 u32 cub_addr2;
734 u32 reserved[13];
735 struct chsc_header response;
736 u32 status : 8;
737 u32 : 4;
738 u32 fmt : 4;
739 u32 : 16;
740 } __attribute__ ((packed)) *secm_area;
741 int ret, ccode;
742
743 spin_lock_irq(&chsc_page_lock);
744 memset(chsc_page, 0, PAGE_SIZE);
745 secm_area = chsc_page;
746 secm_area->request.length = 0x0050;
747 secm_area->request.code = 0x0016;
748
749 secm_area->key = PAGE_DEFAULT_KEY >> 4;
750 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
751 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
752
753 secm_area->operation_code = enable ? 0 : 1;
754
755 ccode = chsc(secm_area);
756 if (ccode > 0) {
757 ret = (ccode == 3) ? -ENODEV : -EBUSY;
758 goto out;
759 }
760
761 switch (secm_area->response.code) {
762 case 0x0102:
763 case 0x0103:
764 ret = -EINVAL;
765 break;
766 default:
767 ret = chsc_error_from_response(secm_area->response.code);
768 }
769 if (ret != 0)
770 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
771 secm_area->response.code);
772out:
773 spin_unlock_irq(&chsc_page_lock);
774 return ret;
775}
776
777int
778chsc_secm(struct channel_subsystem *css, int enable)
779{
780 int ret;
781
782 if (enable && !css->cm_enabled) {
783 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
784 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
785 if (!css->cub_addr1 || !css->cub_addr2) {
786 free_page((unsigned long)css->cub_addr1);
787 free_page((unsigned long)css->cub_addr2);
788 return -ENOMEM;
789 }
790 }
791 ret = __chsc_do_secm(css, enable);
792 if (!ret) {
793 css->cm_enabled = enable;
794 if (css->cm_enabled) {
795 ret = chsc_add_cmg_attr(css);
796 if (ret) {
797 __chsc_do_secm(css, 0);
798 css->cm_enabled = 0;
799 }
800 } else
801 chsc_remove_cmg_attr(css);
802 }
803 if (!css->cm_enabled) {
804 free_page((unsigned long)css->cub_addr1);
805 free_page((unsigned long)css->cub_addr2);
806 }
807 return ret;
808}
809
810int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
811 int c, int m, void *page)
812{
813 struct chsc_scpd *scpd_area;
814 int ccode, ret;
815
816 if ((rfmt == 1) && !css_general_characteristics.fcs)
817 return -EINVAL;
818 if ((rfmt == 2) && !css_general_characteristics.cib)
819 return -EINVAL;
820
821 memset(page, 0, PAGE_SIZE);
822 scpd_area = page;
823 scpd_area->request.length = 0x0010;
824 scpd_area->request.code = 0x0002;
825 scpd_area->cssid = chpid.cssid;
826 scpd_area->first_chpid = chpid.id;
827 scpd_area->last_chpid = chpid.id;
828 scpd_area->m = m;
829 scpd_area->c = c;
830 scpd_area->fmt = fmt;
831 scpd_area->rfmt = rfmt;
832
833 ccode = chsc(scpd_area);
834 if (ccode > 0)
835 return (ccode == 3) ? -ENODEV : -EBUSY;
836
837 ret = chsc_error_from_response(scpd_area->response.code);
838 if (ret)
839 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
840 scpd_area->response.code);
841 return ret;
842}
843EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
844
845int chsc_determine_base_channel_path_desc(struct chp_id chpid,
846 struct channel_path_desc *desc)
847{
848 struct chsc_response_struct *chsc_resp;
849 struct chsc_scpd *scpd_area;
850 unsigned long flags;
851 int ret;
852
853 spin_lock_irqsave(&chsc_page_lock, flags);
854 scpd_area = chsc_page;
855 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
856 if (ret)
857 goto out;
858 chsc_resp = (void *)&scpd_area->response;
859 memcpy(desc, &chsc_resp->data, sizeof(*desc));
860out:
861 spin_unlock_irqrestore(&chsc_page_lock, flags);
862 return ret;
863}
864
865int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
866 struct channel_path_desc_fmt1 *desc)
867{
868 struct chsc_response_struct *chsc_resp;
869 struct chsc_scpd *scpd_area;
870 unsigned long flags;
871 int ret;
872
873 spin_lock_irqsave(&chsc_page_lock, flags);
874 scpd_area = chsc_page;
875 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
876 if (ret)
877 goto out;
878 chsc_resp = (void *)&scpd_area->response;
879 memcpy(desc, &chsc_resp->data, sizeof(*desc));
880out:
881 spin_unlock_irqrestore(&chsc_page_lock, flags);
882 return ret;
883}
884
885static void
886chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
887 struct cmg_chars *chars)
888{
889 struct cmg_chars *cmg_chars;
890 int i, mask;
891
892 cmg_chars = chp->cmg_chars;
893 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
894 mask = 0x80 >> (i + 3);
895 if (cmcv & mask)
896 cmg_chars->values[i] = chars->values[i];
897 else
898 cmg_chars->values[i] = 0;
899 }
900}
901
902int chsc_get_channel_measurement_chars(struct channel_path *chp)
903{
904 struct cmg_chars *cmg_chars;
905 int ccode, ret;
906
907 struct {
908 struct chsc_header request;
909 u32 : 24;
910 u32 first_chpid : 8;
911 u32 : 24;
912 u32 last_chpid : 8;
913 u32 zeroes1;
914 struct chsc_header response;
915 u32 zeroes2;
916 u32 not_valid : 1;
917 u32 shared : 1;
918 u32 : 22;
919 u32 chpid : 8;
920 u32 cmcv : 5;
921 u32 : 11;
922 u32 cmgq : 8;
923 u32 cmg : 8;
924 u32 zeroes3;
925 u32 data[NR_MEASUREMENT_CHARS];
926 } __attribute__ ((packed)) *scmc_area;
927
928 chp->cmg_chars = NULL;
929 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
930 if (!cmg_chars)
931 return -ENOMEM;
932
933 spin_lock_irq(&chsc_page_lock);
934 memset(chsc_page, 0, PAGE_SIZE);
935 scmc_area = chsc_page;
936 scmc_area->request.length = 0x0010;
937 scmc_area->request.code = 0x0022;
938 scmc_area->first_chpid = chp->chpid.id;
939 scmc_area->last_chpid = chp->chpid.id;
940
941 ccode = chsc(scmc_area);
942 if (ccode > 0) {
943 ret = (ccode == 3) ? -ENODEV : -EBUSY;
944 goto out;
945 }
946
947 ret = chsc_error_from_response(scmc_area->response.code);
948 if (ret) {
949 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
950 scmc_area->response.code);
951 goto out;
952 }
953 if (scmc_area->not_valid) {
954 chp->cmg = -1;
955 chp->shared = -1;
956 goto out;
957 }
958 chp->cmg = scmc_area->cmg;
959 chp->shared = scmc_area->shared;
960 if (chp->cmg != 2 && chp->cmg != 3) {
961 /* No cmg-dependent data. */
962 goto out;
963 }
964 chp->cmg_chars = cmg_chars;
965 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
966 (struct cmg_chars *) &scmc_area->data);
967out:
968 spin_unlock_irq(&chsc_page_lock);
969 if (!chp->cmg_chars)
970 kfree(cmg_chars);
971
972 return ret;
973}
974
975int __init chsc_init(void)
976{
977 int ret;
978
979 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
980 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
981 if (!sei_page || !chsc_page) {
982 ret = -ENOMEM;
983 goto out_err;
984 }
985 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
986 if (ret)
987 goto out_err;
988 return ret;
989out_err:
990 free_page((unsigned long)chsc_page);
991 free_page((unsigned long)sei_page);
992 return ret;
993}
994
995void __init chsc_init_cleanup(void)
996{
997 crw_unregister_handler(CRW_RSC_CSS);
998 free_page((unsigned long)chsc_page);
999 free_page((unsigned long)sei_page);
1000}
1001
1002int chsc_enable_facility(int operation_code)
1003{
1004 unsigned long flags;
1005 int ret;
1006 struct {
1007 struct chsc_header request;
1008 u8 reserved1:4;
1009 u8 format:4;
1010 u8 reserved2;
1011 u16 operation_code;
1012 u32 reserved3;
1013 u32 reserved4;
1014 u32 operation_data_area[252];
1015 struct chsc_header response;
1016 u32 reserved5:4;
1017 u32 format2:4;
1018 u32 reserved6:24;
1019 } __attribute__ ((packed)) *sda_area;
1020
1021 spin_lock_irqsave(&chsc_page_lock, flags);
1022 memset(chsc_page, 0, PAGE_SIZE);
1023 sda_area = chsc_page;
1024 sda_area->request.length = 0x0400;
1025 sda_area->request.code = 0x0031;
1026 sda_area->operation_code = operation_code;
1027
1028 ret = chsc(sda_area);
1029 if (ret > 0) {
1030 ret = (ret == 3) ? -ENODEV : -EBUSY;
1031 goto out;
1032 }
1033
1034 switch (sda_area->response.code) {
1035 case 0x0101:
1036 ret = -EOPNOTSUPP;
1037 break;
1038 default:
1039 ret = chsc_error_from_response(sda_area->response.code);
1040 }
1041 if (ret != 0)
1042 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
1043 operation_code, sda_area->response.code);
1044out:
1045 spin_unlock_irqrestore(&chsc_page_lock, flags);
1046 return ret;
1047}
1048
1049struct css_general_char css_general_characteristics;
1050struct css_chsc_char css_chsc_characteristics;
1051
1052int __init
1053chsc_determine_css_characteristics(void)
1054{
1055 int result;
1056 struct {
1057 struct chsc_header request;
1058 u32 reserved1;
1059 u32 reserved2;
1060 u32 reserved3;
1061 struct chsc_header response;
1062 u32 reserved4;
1063 u32 general_char[510];
1064 u32 chsc_char[508];
1065 } __attribute__ ((packed)) *scsc_area;
1066
1067 spin_lock_irq(&chsc_page_lock);
1068 memset(chsc_page, 0, PAGE_SIZE);
1069 scsc_area = chsc_page;
1070 scsc_area->request.length = 0x0010;
1071 scsc_area->request.code = 0x0010;
1072
1073 result = chsc(scsc_area);
1074 if (result) {
1075 result = (result == 3) ? -ENODEV : -EBUSY;
1076 goto exit;
1077 }
1078
1079 result = chsc_error_from_response(scsc_area->response.code);
1080 if (result == 0) {
1081 memcpy(&css_general_characteristics, scsc_area->general_char,
1082 sizeof(css_general_characteristics));
1083 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
1084 sizeof(css_chsc_characteristics));
1085 } else
1086 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
1087 scsc_area->response.code);
1088exit:
1089 spin_unlock_irq(&chsc_page_lock);
1090 return result;
1091}
1092
1093EXPORT_SYMBOL_GPL(css_general_characteristics);
1094EXPORT_SYMBOL_GPL(css_chsc_characteristics);
1095
1096int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
1097{
1098 struct {
1099 struct chsc_header request;
1100 unsigned int rsvd0;
1101 unsigned int op : 8;
1102 unsigned int rsvd1 : 8;
1103 unsigned int ctrl : 16;
1104 unsigned int rsvd2[5];
1105 struct chsc_header response;
1106 unsigned int rsvd3[7];
1107 } __attribute__ ((packed)) *rr;
1108 int rc;
1109
1110 memset(page, 0, PAGE_SIZE);
1111 rr = page;
1112 rr->request.length = 0x0020;
1113 rr->request.code = 0x0033;
1114 rr->op = op;
1115 rr->ctrl = ctrl;
1116 rc = chsc(rr);
1117 if (rc)
1118 return -EIO;
1119 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
1120 return rc;
1121}
1122
1123int chsc_sstpi(void *page, void *result, size_t size)
1124{
1125 struct {
1126 struct chsc_header request;
1127 unsigned int rsvd0[3];
1128 struct chsc_header response;
1129 char data[size];
1130 } __attribute__ ((packed)) *rr;
1131 int rc;
1132
1133 memset(page, 0, PAGE_SIZE);
1134 rr = page;
1135 rr->request.length = 0x0010;
1136 rr->request.code = 0x0038;
1137 rc = chsc(rr);
1138 if (rc)
1139 return -EIO;
1140 memcpy(result, &rr->data, size);
1141 return (rr->response.code == 0x0001) ? 0 : -EIO;
1142}
1143
1144int chsc_siosl(struct subchannel_id schid)
1145{
1146 struct {
1147 struct chsc_header request;
1148 u32 word1;
1149 struct subchannel_id sid;
1150 u32 word3;
1151 struct chsc_header response;
1152 u32 word[11];
1153 } __attribute__ ((packed)) *siosl_area;
1154 unsigned long flags;
1155 int ccode;
1156 int rc;
1157
1158 spin_lock_irqsave(&chsc_page_lock, flags);
1159 memset(chsc_page, 0, PAGE_SIZE);
1160 siosl_area = chsc_page;
1161 siosl_area->request.length = 0x0010;
1162 siosl_area->request.code = 0x0046;
1163 siosl_area->word1 = 0x80000000;
1164 siosl_area->sid = schid;
1165
1166 ccode = chsc(siosl_area);
1167 if (ccode > 0) {
1168 if (ccode == 3)
1169 rc = -ENODEV;
1170 else
1171 rc = -EBUSY;
1172 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1173 schid.ssid, schid.sch_no, ccode);
1174 goto out;
1175 }
1176 rc = chsc_error_from_response(siosl_area->response.code);
1177 if (rc)
1178 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1179 schid.ssid, schid.sch_no,
1180 siosl_area->response.code);
1181 else
1182 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1183 schid.ssid, schid.sch_no);
1184out:
1185 spin_unlock_irqrestore(&chsc_page_lock, flags);
1186 return rc;
1187}
1188EXPORT_SYMBOL_GPL(chsc_siosl);
1189
1190/**
1191 * chsc_scm_info() - store SCM information (SSI)
1192 * @scm_area: request and response block for SSI
1193 * @token: continuation token
1194 *
1195 * Returns 0 on success.
1196 */
1197int chsc_scm_info(struct chsc_scm_info *scm_area, u64 token)
1198{
1199 int ccode, ret;
1200
1201 memset(scm_area, 0, sizeof(*scm_area));
1202 scm_area->request.length = 0x0020;
1203 scm_area->request.code = 0x004C;
1204 scm_area->reqtok = token;
1205
1206 ccode = chsc(scm_area);
1207 if (ccode > 0) {
1208 ret = (ccode == 3) ? -ENODEV : -EBUSY;
1209 goto out;
1210 }
1211 ret = chsc_error_from_response(scm_area->response.code);
1212 if (ret != 0)
1213 CIO_MSG_EVENT(2, "chsc: scm info failed (rc=%04x)\n",
1214 scm_area->response.code);
1215out:
1216 return ret;
1217}
1218EXPORT_SYMBOL_GPL(chsc_scm_info);
1219
1220/**
1221 * chsc_pnso_brinfo() - Perform Network-Subchannel Operation, Bridge Info.
1222 * @schid: id of the subchannel on which PNSO is performed
1223 * @brinfo_area: request and response block for the operation
1224 * @resume_token: resume token for multiblock response
1225 * @cnc: Boolean change-notification control
1226 *
1227 * brinfo_area must be allocated by the caller with get_zeroed_page(GFP_KERNEL)
1228 *
1229 * Returns 0 on success.
1230 */
1231int chsc_pnso_brinfo(struct subchannel_id schid,
1232 struct chsc_pnso_area *brinfo_area,
1233 struct chsc_brinfo_resume_token resume_token,
1234 int cnc)
1235{
1236 memset(brinfo_area, 0, sizeof(*brinfo_area));
1237 brinfo_area->request.length = 0x0030;
1238 brinfo_area->request.code = 0x003d; /* network-subchannel operation */
1239 brinfo_area->m = schid.m;
1240 brinfo_area->ssid = schid.ssid;
1241 brinfo_area->sch = schid.sch_no;
1242 brinfo_area->cssid = schid.cssid;
1243 brinfo_area->oc = 0; /* Store-network-bridging-information list */
1244 brinfo_area->resume_token = resume_token;
1245 brinfo_area->n = (cnc != 0);
1246 if (chsc(brinfo_area))
1247 return -EIO;
1248 return chsc_error_from_response(brinfo_area->response.code);
1249}
1250EXPORT_SYMBOL_GPL(chsc_pnso_brinfo);