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
31 static void *sei_page;
32 static void *chsc_page;
33 static 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 */
chsc_error_from_response(int response)41 int 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 }
60 EXPORT_SYMBOL_GPL(chsc_error_from_response);
61
62 struct 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
chsc_get_ssd_info(struct subchannel_id schid,struct chsc_ssd_info * ssd)86 int 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 }
137 out:
138 spin_unlock_irq(&chsc_page_lock);
139 return ret;
140 }
141
s390_subchannel_remove_chpid(struct subchannel * sch,void * data)142 static 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
151 out_unreg:
152 sch->lpm = 0;
153 spin_unlock_irq(sch->lock);
154 css_schedule_eval(sch->schid);
155 return 0;
156 }
157
chsc_chp_offline(struct chp_id chpid)158 void 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
s390_process_res_acc_new_sch(struct subchannel_id schid,void * data)175 static 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
__s390_process_res_acc(struct subchannel * sch,void * data)195 static 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
s390_process_res_acc(struct chp_link * link)205 static 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
229 static int
__get_chpid_from_lir(void * data)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
259 struct 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
chsc_process_sei_link_incident(struct chsc_sei_area * sei_area)278 static 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
chsc_process_sei_res_acc(struct chsc_sei_area * sei_area)297 static 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
329 struct chp_config_data {
330 u8 map[32];
331 u8 op;
332 u8 pc;
333 };
334
chsc_process_sei_chp_config(struct chsc_sei_area * sei_area)335 static void chsc_process_sei_chp_config(struct chsc_sei_area *sei_area)
336 {
337 struct chp_config_data *data;
338 struct chp_id chpid;
339 int num;
340 char *events[3] = {"configure", "deconfigure", "cancel deconfigure"};
341
342 CIO_CRW_EVENT(4, "chsc: channel-path-configuration notification\n");
343 if (sei_area->rs != 0)
344 return;
345 data = (struct chp_config_data *) &(sei_area->ccdf);
346 chp_id_init(&chpid);
347 for (num = 0; num <= __MAX_CHPID; num++) {
348 if (!chp_test_bit(data->map, num))
349 continue;
350 chpid.id = num;
351 pr_notice("Processing %s for channel path %x.%02x\n",
352 events[data->op], chpid.cssid, chpid.id);
353 switch (data->op) {
354 case 0:
355 chp_cfg_schedule(chpid, 1);
356 break;
357 case 1:
358 chp_cfg_schedule(chpid, 0);
359 break;
360 case 2:
361 chp_cfg_cancel_deconfigure(chpid);
362 break;
363 }
364 }
365 }
366
chsc_process_sei(struct chsc_sei_area * sei_area)367 static void chsc_process_sei(struct chsc_sei_area *sei_area)
368 {
369 /* Check if we might have lost some information. */
370 if (sei_area->flags & 0x40) {
371 CIO_CRW_EVENT(2, "chsc: event overflow\n");
372 css_schedule_eval_all();
373 }
374 /* which kind of information was stored? */
375 switch (sei_area->cc) {
376 case 1: /* link incident*/
377 chsc_process_sei_link_incident(sei_area);
378 break;
379 case 2: /* i/o resource accessibiliy */
380 chsc_process_sei_res_acc(sei_area);
381 break;
382 case 8: /* channel-path-configuration notification */
383 chsc_process_sei_chp_config(sei_area);
384 break;
385 default: /* other stuff */
386 CIO_CRW_EVENT(4, "chsc: unhandled sei content code %d\n",
387 sei_area->cc);
388 break;
389 }
390 }
391
chsc_process_crw(struct crw * crw0,struct crw * crw1,int overflow)392 static void chsc_process_crw(struct crw *crw0, struct crw *crw1, int overflow)
393 {
394 struct chsc_sei_area *sei_area;
395
396 if (overflow) {
397 css_schedule_eval_all();
398 return;
399 }
400 CIO_CRW_EVENT(2, "CRW reports slct=%d, oflw=%d, "
401 "chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
402 crw0->slct, crw0->oflw, crw0->chn, crw0->rsc, crw0->anc,
403 crw0->erc, crw0->rsid);
404 if (!sei_page)
405 return;
406 /* Access to sei_page is serialized through machine check handler
407 * thread, so no need for locking. */
408 sei_area = sei_page;
409
410 CIO_TRACE_EVENT(2, "prcss");
411 do {
412 memset(sei_area, 0, sizeof(*sei_area));
413 sei_area->request.length = 0x0010;
414 sei_area->request.code = 0x000e;
415 if (chsc(sei_area))
416 break;
417
418 if (sei_area->response.code == 0x0001) {
419 CIO_CRW_EVENT(4, "chsc: sei successful\n");
420 chsc_process_sei(sei_area);
421 } else {
422 CIO_CRW_EVENT(2, "chsc: sei failed (rc=%04x)\n",
423 sei_area->response.code);
424 break;
425 }
426 } while (sei_area->flags & 0x80);
427 }
428
chsc_chp_online(struct chp_id chpid)429 void chsc_chp_online(struct chp_id chpid)
430 {
431 char dbf_txt[15];
432 struct chp_link link;
433
434 sprintf(dbf_txt, "cadd%x.%02x", chpid.cssid, chpid.id);
435 CIO_TRACE_EVENT(2, dbf_txt);
436
437 if (chp_get_status(chpid) != 0) {
438 memset(&link, 0, sizeof(struct chp_link));
439 link.chpid = chpid;
440 /* Wait until previous actions have settled. */
441 css_wait_for_slow_path();
442 for_each_subchannel_staged(__s390_process_res_acc, NULL,
443 &link);
444 }
445 }
446
__s390_subchannel_vary_chpid(struct subchannel * sch,struct chp_id chpid,int on)447 static void __s390_subchannel_vary_chpid(struct subchannel *sch,
448 struct chp_id chpid, int on)
449 {
450 unsigned long flags;
451 struct chp_link link;
452
453 memset(&link, 0, sizeof(struct chp_link));
454 link.chpid = chpid;
455 spin_lock_irqsave(sch->lock, flags);
456 if (sch->driver && sch->driver->chp_event)
457 sch->driver->chp_event(sch, &link,
458 on ? CHP_VARY_ON : CHP_VARY_OFF);
459 spin_unlock_irqrestore(sch->lock, flags);
460 }
461
s390_subchannel_vary_chpid_off(struct subchannel * sch,void * data)462 static int s390_subchannel_vary_chpid_off(struct subchannel *sch, void *data)
463 {
464 struct chp_id *chpid = data;
465
466 __s390_subchannel_vary_chpid(sch, *chpid, 0);
467 return 0;
468 }
469
s390_subchannel_vary_chpid_on(struct subchannel * sch,void * data)470 static int s390_subchannel_vary_chpid_on(struct subchannel *sch, void *data)
471 {
472 struct chp_id *chpid = data;
473
474 __s390_subchannel_vary_chpid(sch, *chpid, 1);
475 return 0;
476 }
477
478 static int
__s390_vary_chpid_on(struct subchannel_id schid,void * data)479 __s390_vary_chpid_on(struct subchannel_id schid, void *data)
480 {
481 struct schib schib;
482
483 if (stsch_err(schid, &schib))
484 /* We're through */
485 return -ENXIO;
486 /* Put it on the slow path. */
487 css_schedule_eval(schid);
488 return 0;
489 }
490
491 /**
492 * chsc_chp_vary - propagate channel-path vary operation to subchannels
493 * @chpid: channl-path ID
494 * @on: non-zero for vary online, zero for vary offline
495 */
chsc_chp_vary(struct chp_id chpid,int on)496 int chsc_chp_vary(struct chp_id chpid, int on)
497 {
498 struct channel_path *chp = chpid_to_chp(chpid);
499 struct chp_link link;
500
501 memset(&link, 0, sizeof(struct chp_link));
502 link.chpid = chpid;
503 /* Wait until previous actions have settled. */
504 css_wait_for_slow_path();
505 /*
506 * Redo PathVerification on the devices the chpid connects to
507 */
508 if (on) {
509 /* Try to update the channel path descritor. */
510 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
511 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
512 __s390_vary_chpid_on, &link);
513 } else
514 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
515 NULL, &link);
516
517 return 0;
518 }
519
520 static void
chsc_remove_cmg_attr(struct channel_subsystem * css)521 chsc_remove_cmg_attr(struct channel_subsystem *css)
522 {
523 int i;
524
525 for (i = 0; i <= __MAX_CHPID; i++) {
526 if (!css->chps[i])
527 continue;
528 chp_remove_cmg_attr(css->chps[i]);
529 }
530 }
531
532 static int
chsc_add_cmg_attr(struct channel_subsystem * css)533 chsc_add_cmg_attr(struct channel_subsystem *css)
534 {
535 int i, ret;
536
537 ret = 0;
538 for (i = 0; i <= __MAX_CHPID; i++) {
539 if (!css->chps[i])
540 continue;
541 ret = chp_add_cmg_attr(css->chps[i]);
542 if (ret)
543 goto cleanup;
544 }
545 return ret;
546 cleanup:
547 for (--i; i >= 0; i--) {
548 if (!css->chps[i])
549 continue;
550 chp_remove_cmg_attr(css->chps[i]);
551 }
552 return ret;
553 }
554
__chsc_do_secm(struct channel_subsystem * css,int enable)555 int __chsc_do_secm(struct channel_subsystem *css, int enable)
556 {
557 struct {
558 struct chsc_header request;
559 u32 operation_code : 2;
560 u32 : 30;
561 u32 key : 4;
562 u32 : 28;
563 u32 zeroes1;
564 u32 cub_addr1;
565 u32 zeroes2;
566 u32 cub_addr2;
567 u32 reserved[13];
568 struct chsc_header response;
569 u32 status : 8;
570 u32 : 4;
571 u32 fmt : 4;
572 u32 : 16;
573 } __attribute__ ((packed)) *secm_area;
574 int ret, ccode;
575
576 spin_lock_irq(&chsc_page_lock);
577 memset(chsc_page, 0, PAGE_SIZE);
578 secm_area = chsc_page;
579 secm_area->request.length = 0x0050;
580 secm_area->request.code = 0x0016;
581
582 secm_area->key = PAGE_DEFAULT_KEY >> 4;
583 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
584 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
585
586 secm_area->operation_code = enable ? 0 : 1;
587
588 ccode = chsc(secm_area);
589 if (ccode > 0) {
590 ret = (ccode == 3) ? -ENODEV : -EBUSY;
591 goto out;
592 }
593
594 switch (secm_area->response.code) {
595 case 0x0102:
596 case 0x0103:
597 ret = -EINVAL;
598 break;
599 default:
600 ret = chsc_error_from_response(secm_area->response.code);
601 }
602 if (ret != 0)
603 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
604 secm_area->response.code);
605 out:
606 spin_unlock_irq(&chsc_page_lock);
607 return ret;
608 }
609
610 int
chsc_secm(struct channel_subsystem * css,int enable)611 chsc_secm(struct channel_subsystem *css, int enable)
612 {
613 int ret;
614
615 if (enable && !css->cm_enabled) {
616 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
617 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
618 if (!css->cub_addr1 || !css->cub_addr2) {
619 free_page((unsigned long)css->cub_addr1);
620 free_page((unsigned long)css->cub_addr2);
621 return -ENOMEM;
622 }
623 }
624 ret = __chsc_do_secm(css, enable);
625 if (!ret) {
626 css->cm_enabled = enable;
627 if (css->cm_enabled) {
628 ret = chsc_add_cmg_attr(css);
629 if (ret) {
630 __chsc_do_secm(css, 0);
631 css->cm_enabled = 0;
632 }
633 } else
634 chsc_remove_cmg_attr(css);
635 }
636 if (!css->cm_enabled) {
637 free_page((unsigned long)css->cub_addr1);
638 free_page((unsigned long)css->cub_addr2);
639 }
640 return ret;
641 }
642
chsc_determine_channel_path_desc(struct chp_id chpid,int fmt,int rfmt,int c,int m,void * page)643 int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
644 int c, int m, void *page)
645 {
646 struct chsc_scpd *scpd_area;
647 int ccode, ret;
648
649 if ((rfmt == 1) && !css_general_characteristics.fcs)
650 return -EINVAL;
651 if ((rfmt == 2) && !css_general_characteristics.cib)
652 return -EINVAL;
653
654 memset(page, 0, PAGE_SIZE);
655 scpd_area = page;
656 scpd_area->request.length = 0x0010;
657 scpd_area->request.code = 0x0002;
658 scpd_area->cssid = chpid.cssid;
659 scpd_area->first_chpid = chpid.id;
660 scpd_area->last_chpid = chpid.id;
661 scpd_area->m = m;
662 scpd_area->c = c;
663 scpd_area->fmt = fmt;
664 scpd_area->rfmt = rfmt;
665
666 ccode = chsc(scpd_area);
667 if (ccode > 0)
668 return (ccode == 3) ? -ENODEV : -EBUSY;
669
670 ret = chsc_error_from_response(scpd_area->response.code);
671 if (ret)
672 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
673 scpd_area->response.code);
674 return ret;
675 }
676 EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
677
chsc_determine_base_channel_path_desc(struct chp_id chpid,struct channel_path_desc * desc)678 int chsc_determine_base_channel_path_desc(struct chp_id chpid,
679 struct channel_path_desc *desc)
680 {
681 struct chsc_response_struct *chsc_resp;
682 struct chsc_scpd *scpd_area;
683 unsigned long flags;
684 int ret;
685
686 spin_lock_irqsave(&chsc_page_lock, flags);
687 scpd_area = chsc_page;
688 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
689 if (ret)
690 goto out;
691 chsc_resp = (void *)&scpd_area->response;
692 memcpy(desc, &chsc_resp->data, sizeof(*desc));
693 out:
694 spin_unlock_irqrestore(&chsc_page_lock, flags);
695 return ret;
696 }
697
chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,struct channel_path_desc_fmt1 * desc)698 int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
699 struct channel_path_desc_fmt1 *desc)
700 {
701 struct chsc_response_struct *chsc_resp;
702 struct chsc_scpd *scpd_area;
703 int ret;
704
705 spin_lock_irq(&chsc_page_lock);
706 scpd_area = chsc_page;
707 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
708 if (ret)
709 goto out;
710 chsc_resp = (void *)&scpd_area->response;
711 memcpy(desc, &chsc_resp->data, sizeof(*desc));
712 out:
713 spin_unlock_irq(&chsc_page_lock);
714 return ret;
715 }
716
717 static void
chsc_initialize_cmg_chars(struct channel_path * chp,u8 cmcv,struct cmg_chars * chars)718 chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
719 struct cmg_chars *chars)
720 {
721 struct cmg_chars *cmg_chars;
722 int i, mask;
723
724 cmg_chars = chp->cmg_chars;
725 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
726 mask = 0x80 >> (i + 3);
727 if (cmcv & mask)
728 cmg_chars->values[i] = chars->values[i];
729 else
730 cmg_chars->values[i] = 0;
731 }
732 }
733
chsc_get_channel_measurement_chars(struct channel_path * chp)734 int chsc_get_channel_measurement_chars(struct channel_path *chp)
735 {
736 struct cmg_chars *cmg_chars;
737 int ccode, ret;
738
739 struct {
740 struct chsc_header request;
741 u32 : 24;
742 u32 first_chpid : 8;
743 u32 : 24;
744 u32 last_chpid : 8;
745 u32 zeroes1;
746 struct chsc_header response;
747 u32 zeroes2;
748 u32 not_valid : 1;
749 u32 shared : 1;
750 u32 : 22;
751 u32 chpid : 8;
752 u32 cmcv : 5;
753 u32 : 11;
754 u32 cmgq : 8;
755 u32 cmg : 8;
756 u32 zeroes3;
757 u32 data[NR_MEASUREMENT_CHARS];
758 } __attribute__ ((packed)) *scmc_area;
759
760 chp->cmg_chars = NULL;
761 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
762 if (!cmg_chars)
763 return -ENOMEM;
764
765 spin_lock_irq(&chsc_page_lock);
766 memset(chsc_page, 0, PAGE_SIZE);
767 scmc_area = chsc_page;
768 scmc_area->request.length = 0x0010;
769 scmc_area->request.code = 0x0022;
770 scmc_area->first_chpid = chp->chpid.id;
771 scmc_area->last_chpid = chp->chpid.id;
772
773 ccode = chsc(scmc_area);
774 if (ccode > 0) {
775 ret = (ccode == 3) ? -ENODEV : -EBUSY;
776 goto out;
777 }
778
779 ret = chsc_error_from_response(scmc_area->response.code);
780 if (ret) {
781 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
782 scmc_area->response.code);
783 goto out;
784 }
785 if (scmc_area->not_valid) {
786 chp->cmg = -1;
787 chp->shared = -1;
788 goto out;
789 }
790 chp->cmg = scmc_area->cmg;
791 chp->shared = scmc_area->shared;
792 if (chp->cmg != 2 && chp->cmg != 3) {
793 /* No cmg-dependent data. */
794 goto out;
795 }
796 chp->cmg_chars = cmg_chars;
797 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
798 (struct cmg_chars *) &scmc_area->data);
799 out:
800 spin_unlock_irq(&chsc_page_lock);
801 if (!chp->cmg_chars)
802 kfree(cmg_chars);
803
804 return ret;
805 }
806
chsc_init(void)807 int __init chsc_init(void)
808 {
809 int ret;
810
811 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
812 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
813 if (!sei_page || !chsc_page) {
814 ret = -ENOMEM;
815 goto out_err;
816 }
817 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
818 if (ret)
819 goto out_err;
820 return ret;
821 out_err:
822 free_page((unsigned long)chsc_page);
823 free_page((unsigned long)sei_page);
824 return ret;
825 }
826
chsc_init_cleanup(void)827 void __init chsc_init_cleanup(void)
828 {
829 crw_unregister_handler(CRW_RSC_CSS);
830 free_page((unsigned long)chsc_page);
831 free_page((unsigned long)sei_page);
832 }
833
chsc_enable_facility(int operation_code)834 int chsc_enable_facility(int operation_code)
835 {
836 unsigned long flags;
837 int ret;
838 struct {
839 struct chsc_header request;
840 u8 reserved1:4;
841 u8 format:4;
842 u8 reserved2;
843 u16 operation_code;
844 u32 reserved3;
845 u32 reserved4;
846 u32 operation_data_area[252];
847 struct chsc_header response;
848 u32 reserved5:4;
849 u32 format2:4;
850 u32 reserved6:24;
851 } __attribute__ ((packed)) *sda_area;
852
853 spin_lock_irqsave(&chsc_page_lock, flags);
854 memset(chsc_page, 0, PAGE_SIZE);
855 sda_area = chsc_page;
856 sda_area->request.length = 0x0400;
857 sda_area->request.code = 0x0031;
858 sda_area->operation_code = operation_code;
859
860 ret = chsc(sda_area);
861 if (ret > 0) {
862 ret = (ret == 3) ? -ENODEV : -EBUSY;
863 goto out;
864 }
865
866 switch (sda_area->response.code) {
867 case 0x0101:
868 ret = -EOPNOTSUPP;
869 break;
870 default:
871 ret = chsc_error_from_response(sda_area->response.code);
872 }
873 if (ret != 0)
874 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
875 operation_code, sda_area->response.code);
876 out:
877 spin_unlock_irqrestore(&chsc_page_lock, flags);
878 return ret;
879 }
880
881 struct css_general_char css_general_characteristics;
882 struct css_chsc_char css_chsc_characteristics;
883
884 int __init
chsc_determine_css_characteristics(void)885 chsc_determine_css_characteristics(void)
886 {
887 int result;
888 struct {
889 struct chsc_header request;
890 u32 reserved1;
891 u32 reserved2;
892 u32 reserved3;
893 struct chsc_header response;
894 u32 reserved4;
895 u32 general_char[510];
896 u32 chsc_char[508];
897 } __attribute__ ((packed)) *scsc_area;
898
899 spin_lock_irq(&chsc_page_lock);
900 memset(chsc_page, 0, PAGE_SIZE);
901 scsc_area = chsc_page;
902 scsc_area->request.length = 0x0010;
903 scsc_area->request.code = 0x0010;
904
905 result = chsc(scsc_area);
906 if (result) {
907 result = (result == 3) ? -ENODEV : -EBUSY;
908 goto exit;
909 }
910
911 result = chsc_error_from_response(scsc_area->response.code);
912 if (result == 0) {
913 memcpy(&css_general_characteristics, scsc_area->general_char,
914 sizeof(css_general_characteristics));
915 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
916 sizeof(css_chsc_characteristics));
917 } else
918 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
919 scsc_area->response.code);
920 exit:
921 spin_unlock_irq(&chsc_page_lock);
922 return result;
923 }
924
925 EXPORT_SYMBOL_GPL(css_general_characteristics);
926 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
927
chsc_sstpc(void * page,unsigned int op,u16 ctrl)928 int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
929 {
930 struct {
931 struct chsc_header request;
932 unsigned int rsvd0;
933 unsigned int op : 8;
934 unsigned int rsvd1 : 8;
935 unsigned int ctrl : 16;
936 unsigned int rsvd2[5];
937 struct chsc_header response;
938 unsigned int rsvd3[7];
939 } __attribute__ ((packed)) *rr;
940 int rc;
941
942 memset(page, 0, PAGE_SIZE);
943 rr = page;
944 rr->request.length = 0x0020;
945 rr->request.code = 0x0033;
946 rr->op = op;
947 rr->ctrl = ctrl;
948 rc = chsc(rr);
949 if (rc)
950 return -EIO;
951 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
952 return rc;
953 }
954
chsc_sstpi(void * page,void * result,size_t size)955 int chsc_sstpi(void *page, void *result, size_t size)
956 {
957 struct {
958 struct chsc_header request;
959 unsigned int rsvd0[3];
960 struct chsc_header response;
961 char data[size];
962 } __attribute__ ((packed)) *rr;
963 int rc;
964
965 memset(page, 0, PAGE_SIZE);
966 rr = page;
967 rr->request.length = 0x0010;
968 rr->request.code = 0x0038;
969 rc = chsc(rr);
970 if (rc)
971 return -EIO;
972 memcpy(result, &rr->data, size);
973 return (rr->response.code == 0x0001) ? 0 : -EIO;
974 }
975
chsc_siosl(struct subchannel_id schid)976 int chsc_siosl(struct subchannel_id schid)
977 {
978 struct {
979 struct chsc_header request;
980 u32 word1;
981 struct subchannel_id sid;
982 u32 word3;
983 struct chsc_header response;
984 u32 word[11];
985 } __attribute__ ((packed)) *siosl_area;
986 unsigned long flags;
987 int ccode;
988 int rc;
989
990 spin_lock_irqsave(&chsc_page_lock, flags);
991 memset(chsc_page, 0, PAGE_SIZE);
992 siosl_area = chsc_page;
993 siosl_area->request.length = 0x0010;
994 siosl_area->request.code = 0x0046;
995 siosl_area->word1 = 0x80000000;
996 siosl_area->sid = schid;
997
998 ccode = chsc(siosl_area);
999 if (ccode > 0) {
1000 if (ccode == 3)
1001 rc = -ENODEV;
1002 else
1003 rc = -EBUSY;
1004 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1005 schid.ssid, schid.sch_no, ccode);
1006 goto out;
1007 }
1008 rc = chsc_error_from_response(siosl_area->response.code);
1009 if (rc)
1010 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1011 schid.ssid, schid.sch_no,
1012 siosl_area->response.code);
1013 else
1014 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1015 schid.ssid, schid.sch_no);
1016 out:
1017 spin_unlock_irqrestore(&chsc_page_lock, flags);
1018 return rc;
1019 }
1020 EXPORT_SYMBOL_GPL(chsc_siosl);
1021