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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
37
38
39
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;
68 u16 :16;
69 u16 l_sch;
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;
76 u8 zeroes : 3;
77 u8 unit_addr;
78 u16 devno;
79 u8 path_mask;
80 u8 fla_valid_mask;
81 u16 sch;
82 u8 chpid[8];
83 u16 fla[8];
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
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
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
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
180
181
182
183
184
185
186 if (stsch_err(schid, &schib))
187
188 return -ENXIO;
189
190
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
217 css_wait_for_slow_path();
218
219
220
221
222
223
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
237 u32 indesc[28];
238
239 u32 andesc[28];
240
241 u32 isinfo[28];
242 } __attribute__ ((packed)) *lir;
243
244 lir = data;
245 if (!(lir->iq&0x80))
246
247 return -EINVAL;
248 if (!(lir->indesc[0]&0xc0000000))
249
250 return -EINVAL;
251 if (!(lir->indesc[0]&0x10000000))
252
253 return -EINVAL;
254
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;
268 u8 rs;
269 u8 cc;
270 u16 fla;
271 u16 rsid;
272 u32 reserved5;
273 u32 reserved6;
274 u8 ccdf[4096 - 16 - 24];
275
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
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
321 link.fla_mask = 0xffff;
322 else
323
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
400 if (sei_area->flags & 0x40) {
401 CIO_CRW_EVENT(2, "chsc: event overflow\n");
402 css_schedule_eval_all();
403 }
404
405 switch (sei_area->cc) {
406 case 1:
407 chsc_process_sei_link_incident(sei_area);
408 break;
409 case 2:
410 chsc_process_sei_res_acc(sei_area);
411 break;
412 case 7:
413 chsc_process_sei_chp_avail(sei_area);
414 break;
415 case 8:
416 chsc_process_sei_chp_config(sei_area);
417 break;
418 default:
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
440
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
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
518 return -ENXIO;
519
520 css_schedule_eval(schid);
521 return 0;
522}
523
524
525
526
527
528
529int chsc_chp_vary(struct chp_id chpid, int on)
530{
531 struct channel_path *chp = chpid_to_chp(chpid);
532
533
534 css_wait_for_slow_path();
535
536
537
538 if (on) {
539
540 chsc_determine_base_channel_path_desc(chpid, &chp->desc);
541 for_each_subchannel_staged(s390_subchannel_vary_chpid_on,
542 __s390_vary_chpid_on, &chpid);
543 } else
544 for_each_subchannel_staged(s390_subchannel_vary_chpid_off,
545 NULL, &chpid);
546
547 return 0;
548}
549
550static void
551chsc_remove_cmg_attr(struct channel_subsystem *css)
552{
553 int i;
554
555 for (i = 0; i <= __MAX_CHPID; i++) {
556 if (!css->chps[i])
557 continue;
558 chp_remove_cmg_attr(css->chps[i]);
559 }
560}
561
562static int
563chsc_add_cmg_attr(struct channel_subsystem *css)
564{
565 int i, ret;
566
567 ret = 0;
568 for (i = 0; i <= __MAX_CHPID; i++) {
569 if (!css->chps[i])
570 continue;
571 ret = chp_add_cmg_attr(css->chps[i]);
572 if (ret)
573 goto cleanup;
574 }
575 return ret;
576cleanup:
577 for (--i; i >= 0; i--) {
578 if (!css->chps[i])
579 continue;
580 chp_remove_cmg_attr(css->chps[i]);
581 }
582 return ret;
583}
584
585int __chsc_do_secm(struct channel_subsystem *css, int enable)
586{
587 struct {
588 struct chsc_header request;
589 u32 operation_code : 2;
590 u32 : 30;
591 u32 key : 4;
592 u32 : 28;
593 u32 zeroes1;
594 u32 cub_addr1;
595 u32 zeroes2;
596 u32 cub_addr2;
597 u32 reserved[13];
598 struct chsc_header response;
599 u32 status : 8;
600 u32 : 4;
601 u32 fmt : 4;
602 u32 : 16;
603 } __attribute__ ((packed)) *secm_area;
604 int ret, ccode;
605
606 spin_lock_irq(&chsc_page_lock);
607 memset(chsc_page, 0, PAGE_SIZE);
608 secm_area = chsc_page;
609 secm_area->request.length = 0x0050;
610 secm_area->request.code = 0x0016;
611
612 secm_area->key = PAGE_DEFAULT_KEY >> 4;
613 secm_area->cub_addr1 = (u64)(unsigned long)css->cub_addr1;
614 secm_area->cub_addr2 = (u64)(unsigned long)css->cub_addr2;
615
616 secm_area->operation_code = enable ? 0 : 1;
617
618 ccode = chsc(secm_area);
619 if (ccode > 0) {
620 ret = (ccode == 3) ? -ENODEV : -EBUSY;
621 goto out;
622 }
623
624 switch (secm_area->response.code) {
625 case 0x0102:
626 case 0x0103:
627 ret = -EINVAL;
628 break;
629 default:
630 ret = chsc_error_from_response(secm_area->response.code);
631 }
632 if (ret != 0)
633 CIO_CRW_EVENT(2, "chsc: secm failed (rc=%04x)\n",
634 secm_area->response.code);
635out:
636 spin_unlock_irq(&chsc_page_lock);
637 return ret;
638}
639
640int
641chsc_secm(struct channel_subsystem *css, int enable)
642{
643 int ret;
644
645 if (enable && !css->cm_enabled) {
646 css->cub_addr1 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
647 css->cub_addr2 = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
648 if (!css->cub_addr1 || !css->cub_addr2) {
649 free_page((unsigned long)css->cub_addr1);
650 free_page((unsigned long)css->cub_addr2);
651 return -ENOMEM;
652 }
653 }
654 ret = __chsc_do_secm(css, enable);
655 if (!ret) {
656 css->cm_enabled = enable;
657 if (css->cm_enabled) {
658 ret = chsc_add_cmg_attr(css);
659 if (ret) {
660 __chsc_do_secm(css, 0);
661 css->cm_enabled = 0;
662 }
663 } else
664 chsc_remove_cmg_attr(css);
665 }
666 if (!css->cm_enabled) {
667 free_page((unsigned long)css->cub_addr1);
668 free_page((unsigned long)css->cub_addr2);
669 }
670 return ret;
671}
672
673int chsc_determine_channel_path_desc(struct chp_id chpid, int fmt, int rfmt,
674 int c, int m, void *page)
675{
676 struct chsc_scpd *scpd_area;
677 int ccode, ret;
678
679 if ((rfmt == 1) && !css_general_characteristics.fcs)
680 return -EINVAL;
681 if ((rfmt == 2) && !css_general_characteristics.cib)
682 return -EINVAL;
683
684 memset(page, 0, PAGE_SIZE);
685 scpd_area = page;
686 scpd_area->request.length = 0x0010;
687 scpd_area->request.code = 0x0002;
688 scpd_area->cssid = chpid.cssid;
689 scpd_area->first_chpid = chpid.id;
690 scpd_area->last_chpid = chpid.id;
691 scpd_area->m = m;
692 scpd_area->c = c;
693 scpd_area->fmt = fmt;
694 scpd_area->rfmt = rfmt;
695
696 ccode = chsc(scpd_area);
697 if (ccode > 0)
698 return (ccode == 3) ? -ENODEV : -EBUSY;
699
700 ret = chsc_error_from_response(scpd_area->response.code);
701 if (ret)
702 CIO_CRW_EVENT(2, "chsc: scpd failed (rc=%04x)\n",
703 scpd_area->response.code);
704 return ret;
705}
706EXPORT_SYMBOL_GPL(chsc_determine_channel_path_desc);
707
708int chsc_determine_base_channel_path_desc(struct chp_id chpid,
709 struct channel_path_desc *desc)
710{
711 struct chsc_response_struct *chsc_resp;
712 struct chsc_scpd *scpd_area;
713 unsigned long flags;
714 int ret;
715
716 spin_lock_irqsave(&chsc_page_lock, flags);
717 scpd_area = chsc_page;
718 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 0, 0, scpd_area);
719 if (ret)
720 goto out;
721 chsc_resp = (void *)&scpd_area->response;
722 memcpy(desc, &chsc_resp->data, sizeof(*desc));
723out:
724 spin_unlock_irqrestore(&chsc_page_lock, flags);
725 return ret;
726}
727
728int chsc_determine_fmt1_channel_path_desc(struct chp_id chpid,
729 struct channel_path_desc_fmt1 *desc)
730{
731 struct chsc_response_struct *chsc_resp;
732 struct chsc_scpd *scpd_area;
733 int ret;
734
735 spin_lock_irq(&chsc_page_lock);
736 scpd_area = chsc_page;
737 ret = chsc_determine_channel_path_desc(chpid, 0, 0, 1, 0, scpd_area);
738 if (ret)
739 goto out;
740 chsc_resp = (void *)&scpd_area->response;
741 memcpy(desc, &chsc_resp->data, sizeof(*desc));
742out:
743 spin_unlock_irq(&chsc_page_lock);
744 return ret;
745}
746
747static void
748chsc_initialize_cmg_chars(struct channel_path *chp, u8 cmcv,
749 struct cmg_chars *chars)
750{
751 struct cmg_chars *cmg_chars;
752 int i, mask;
753
754 cmg_chars = chp->cmg_chars;
755 for (i = 0; i < NR_MEASUREMENT_CHARS; i++) {
756 mask = 0x80 >> (i + 3);
757 if (cmcv & mask)
758 cmg_chars->values[i] = chars->values[i];
759 else
760 cmg_chars->values[i] = 0;
761 }
762}
763
764int chsc_get_channel_measurement_chars(struct channel_path *chp)
765{
766 struct cmg_chars *cmg_chars;
767 int ccode, ret;
768
769 struct {
770 struct chsc_header request;
771 u32 : 24;
772 u32 first_chpid : 8;
773 u32 : 24;
774 u32 last_chpid : 8;
775 u32 zeroes1;
776 struct chsc_header response;
777 u32 zeroes2;
778 u32 not_valid : 1;
779 u32 shared : 1;
780 u32 : 22;
781 u32 chpid : 8;
782 u32 cmcv : 5;
783 u32 : 11;
784 u32 cmgq : 8;
785 u32 cmg : 8;
786 u32 zeroes3;
787 u32 data[NR_MEASUREMENT_CHARS];
788 } __attribute__ ((packed)) *scmc_area;
789
790 chp->cmg_chars = NULL;
791 cmg_chars = kmalloc(sizeof(*cmg_chars), GFP_KERNEL);
792 if (!cmg_chars)
793 return -ENOMEM;
794
795 spin_lock_irq(&chsc_page_lock);
796 memset(chsc_page, 0, PAGE_SIZE);
797 scmc_area = chsc_page;
798 scmc_area->request.length = 0x0010;
799 scmc_area->request.code = 0x0022;
800 scmc_area->first_chpid = chp->chpid.id;
801 scmc_area->last_chpid = chp->chpid.id;
802
803 ccode = chsc(scmc_area);
804 if (ccode > 0) {
805 ret = (ccode == 3) ? -ENODEV : -EBUSY;
806 goto out;
807 }
808
809 ret = chsc_error_from_response(scmc_area->response.code);
810 if (ret) {
811 CIO_CRW_EVENT(2, "chsc: scmc failed (rc=%04x)\n",
812 scmc_area->response.code);
813 goto out;
814 }
815 if (scmc_area->not_valid) {
816 chp->cmg = -1;
817 chp->shared = -1;
818 goto out;
819 }
820 chp->cmg = scmc_area->cmg;
821 chp->shared = scmc_area->shared;
822 if (chp->cmg != 2 && chp->cmg != 3) {
823
824 goto out;
825 }
826 chp->cmg_chars = cmg_chars;
827 chsc_initialize_cmg_chars(chp, scmc_area->cmcv,
828 (struct cmg_chars *) &scmc_area->data);
829out:
830 spin_unlock_irq(&chsc_page_lock);
831 if (!chp->cmg_chars)
832 kfree(cmg_chars);
833
834 return ret;
835}
836
837int __init chsc_init(void)
838{
839 int ret;
840
841 sei_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
842 chsc_page = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
843 if (!sei_page || !chsc_page) {
844 ret = -ENOMEM;
845 goto out_err;
846 }
847 ret = crw_register_handler(CRW_RSC_CSS, chsc_process_crw);
848 if (ret)
849 goto out_err;
850 return ret;
851out_err:
852 free_page((unsigned long)chsc_page);
853 free_page((unsigned long)sei_page);
854 return ret;
855}
856
857void __init chsc_init_cleanup(void)
858{
859 crw_unregister_handler(CRW_RSC_CSS);
860 free_page((unsigned long)chsc_page);
861 free_page((unsigned long)sei_page);
862}
863
864int chsc_enable_facility(int operation_code)
865{
866 unsigned long flags;
867 int ret;
868 struct {
869 struct chsc_header request;
870 u8 reserved1:4;
871 u8 format:4;
872 u8 reserved2;
873 u16 operation_code;
874 u32 reserved3;
875 u32 reserved4;
876 u32 operation_data_area[252];
877 struct chsc_header response;
878 u32 reserved5:4;
879 u32 format2:4;
880 u32 reserved6:24;
881 } __attribute__ ((packed)) *sda_area;
882
883 spin_lock_irqsave(&chsc_page_lock, flags);
884 memset(chsc_page, 0, PAGE_SIZE);
885 sda_area = chsc_page;
886 sda_area->request.length = 0x0400;
887 sda_area->request.code = 0x0031;
888 sda_area->operation_code = operation_code;
889
890 ret = chsc(sda_area);
891 if (ret > 0) {
892 ret = (ret == 3) ? -ENODEV : -EBUSY;
893 goto out;
894 }
895
896 switch (sda_area->response.code) {
897 case 0x0101:
898 ret = -EOPNOTSUPP;
899 break;
900 default:
901 ret = chsc_error_from_response(sda_area->response.code);
902 }
903 if (ret != 0)
904 CIO_CRW_EVENT(2, "chsc: sda (oc=%x) failed (rc=%04x)\n",
905 operation_code, sda_area->response.code);
906out:
907 spin_unlock_irqrestore(&chsc_page_lock, flags);
908 return ret;
909}
910
911struct css_general_char css_general_characteristics;
912struct css_chsc_char css_chsc_characteristics;
913
914int __init
915chsc_determine_css_characteristics(void)
916{
917 int result;
918 struct {
919 struct chsc_header request;
920 u32 reserved1;
921 u32 reserved2;
922 u32 reserved3;
923 struct chsc_header response;
924 u32 reserved4;
925 u32 general_char[510];
926 u32 chsc_char[508];
927 } __attribute__ ((packed)) *scsc_area;
928
929 spin_lock_irq(&chsc_page_lock);
930 memset(chsc_page, 0, PAGE_SIZE);
931 scsc_area = chsc_page;
932 scsc_area->request.length = 0x0010;
933 scsc_area->request.code = 0x0010;
934
935 result = chsc(scsc_area);
936 if (result) {
937 result = (result == 3) ? -ENODEV : -EBUSY;
938 goto exit;
939 }
940
941 result = chsc_error_from_response(scsc_area->response.code);
942 if (result == 0) {
943 memcpy(&css_general_characteristics, scsc_area->general_char,
944 sizeof(css_general_characteristics));
945 memcpy(&css_chsc_characteristics, scsc_area->chsc_char,
946 sizeof(css_chsc_characteristics));
947 } else
948 CIO_CRW_EVENT(2, "chsc: scsc failed (rc=%04x)\n",
949 scsc_area->response.code);
950exit:
951 spin_unlock_irq(&chsc_page_lock);
952 return result;
953}
954
955EXPORT_SYMBOL_GPL(css_general_characteristics);
956EXPORT_SYMBOL_GPL(css_chsc_characteristics);
957
958int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
959{
960 struct {
961 struct chsc_header request;
962 unsigned int rsvd0;
963 unsigned int op : 8;
964 unsigned int rsvd1 : 8;
965 unsigned int ctrl : 16;
966 unsigned int rsvd2[5];
967 struct chsc_header response;
968 unsigned int rsvd3[7];
969 } __attribute__ ((packed)) *rr;
970 int rc;
971
972 memset(page, 0, PAGE_SIZE);
973 rr = page;
974 rr->request.length = 0x0020;
975 rr->request.code = 0x0033;
976 rr->op = op;
977 rr->ctrl = ctrl;
978 rc = chsc(rr);
979 if (rc)
980 return -EIO;
981 rc = (rr->response.code == 0x0001) ? 0 : -EIO;
982 return rc;
983}
984
985int chsc_sstpi(void *page, void *result, size_t size)
986{
987 struct {
988 struct chsc_header request;
989 unsigned int rsvd0[3];
990 struct chsc_header response;
991 char data[size];
992 } __attribute__ ((packed)) *rr;
993 int rc;
994
995 memset(page, 0, PAGE_SIZE);
996 rr = page;
997 rr->request.length = 0x0010;
998 rr->request.code = 0x0038;
999 rc = chsc(rr);
1000 if (rc)
1001 return -EIO;
1002 memcpy(result, &rr->data, size);
1003 return (rr->response.code == 0x0001) ? 0 : -EIO;
1004}
1005
1006int chsc_siosl(struct subchannel_id schid)
1007{
1008 struct {
1009 struct chsc_header request;
1010 u32 word1;
1011 struct subchannel_id sid;
1012 u32 word3;
1013 struct chsc_header response;
1014 u32 word[11];
1015 } __attribute__ ((packed)) *siosl_area;
1016 unsigned long flags;
1017 int ccode;
1018 int rc;
1019
1020 spin_lock_irqsave(&chsc_page_lock, flags);
1021 memset(chsc_page, 0, PAGE_SIZE);
1022 siosl_area = chsc_page;
1023 siosl_area->request.length = 0x0010;
1024 siosl_area->request.code = 0x0046;
1025 siosl_area->word1 = 0x80000000;
1026 siosl_area->sid = schid;
1027
1028 ccode = chsc(siosl_area);
1029 if (ccode > 0) {
1030 if (ccode == 3)
1031 rc = -ENODEV;
1032 else
1033 rc = -EBUSY;
1034 CIO_MSG_EVENT(2, "chsc: chsc failed for 0.%x.%04x (ccode=%d)\n",
1035 schid.ssid, schid.sch_no, ccode);
1036 goto out;
1037 }
1038 rc = chsc_error_from_response(siosl_area->response.code);
1039 if (rc)
1040 CIO_MSG_EVENT(2, "chsc: siosl failed for 0.%x.%04x (rc=%04x)\n",
1041 schid.ssid, schid.sch_no,
1042 siosl_area->response.code);
1043 else
1044 CIO_MSG_EVENT(4, "chsc: siosl succeeded for 0.%x.%04x\n",
1045 schid.ssid, schid.sch_no);
1046out:
1047 spin_unlock_irqrestore(&chsc_page_lock, flags);
1048 return rc;
1049}
1050EXPORT_SYMBOL_GPL(chsc_siosl);
1051
