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Linux 3.4.102
[linux/fpc-iii.git] / drivers / s390 / char / sclp_cmd.c
blobe73b2191f677fc4b471233f58de9c86649678576
1 /*
2 * Copyright IBM Corp. 2007, 2009
3 *
4 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
5 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
6 */
7
8 #define KMSG_COMPONENT "sclp_cmd"
9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
10
11 #include <linux/completion.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/string.h>
17 #include <linux/mm.h>
18 #include <linux/mmzone.h>
19 #include <linux/memory.h>
20 #include <linux/platform_device.h>
21 #include <asm/chpid.h>
22 #include <asm/sclp.h>
23 #include <asm/setup.h>
24 #include <asm/ctl_reg.h>
25
26 #include "sclp.h"
27
28 #define SCLP_CMDW_READ_SCP_INFO 0x00020001
29 #define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
30
31 struct read_info_sccb {
32 struct sccb_header header; /* 0-7 */
33 u16 rnmax; /* 8-9 */
34 u8 rnsize; /* 10 */
35 u8 _reserved0[24 - 11]; /* 11-15 */
36 u8 loadparm[8]; /* 24-31 */
37 u8 _reserved1[48 - 32]; /* 32-47 */
38 u64 facilities; /* 48-55 */
39 u8 _reserved2[84 - 56]; /* 56-83 */
40 u8 fac84; /* 84 */
41 u8 _reserved3[91 - 85]; /* 85-90 */
42 u8 flags; /* 91 */
43 u8 _reserved4[100 - 92]; /* 92-99 */
44 u32 rnsize2; /* 100-103 */
45 u64 rnmax2; /* 104-111 */
46 u8 _reserved5[4096 - 112]; /* 112-4095 */
47 } __attribute__((packed, aligned(PAGE_SIZE)));
48
49 static struct read_info_sccb __initdata early_read_info_sccb;
50 static int __initdata early_read_info_sccb_valid;
51
52 u64 sclp_facilities;
53 static u8 sclp_fac84;
54 static unsigned long long rzm;
55 static unsigned long long rnmax;
56
57 static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
58 {
59 int rc;
60
61 __ctl_set_bit(0, 9);
62 rc = sclp_service_call(cmd, sccb);
63 if (rc)
64 goto out;
65 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
66 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
67 local_irq_disable();
68 out:
69 /* Contents of the sccb might have changed. */
70 barrier();
71 __ctl_clear_bit(0, 9);
72 return rc;
73 }
74
75 static void __init sclp_read_info_early(void)
76 {
77 int rc;
78 int i;
79 struct read_info_sccb *sccb;
80 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
81 SCLP_CMDW_READ_SCP_INFO};
82
83 sccb = &early_read_info_sccb;
84 for (i = 0; i < ARRAY_SIZE(commands); i++) {
85 do {
86 memset(sccb, 0, sizeof(*sccb));
87 sccb->header.length = sizeof(*sccb);
88 sccb->header.function_code = 0x80;
89 sccb->header.control_mask[2] = 0x80;
90 rc = sclp_cmd_sync_early(commands[i], sccb);
91 } while (rc == -EBUSY);
92
93 if (rc)
94 break;
95 if (sccb->header.response_code == 0x10) {
96 early_read_info_sccb_valid = 1;
97 break;
98 }
99 if (sccb->header.response_code != 0x1f0)
100 break;
101 }
102 }
103
104 void __init sclp_facilities_detect(void)
105 {
106 struct read_info_sccb *sccb;
107
108 sclp_read_info_early();
109 if (!early_read_info_sccb_valid)
110 return;
111
112 sccb = &early_read_info_sccb;
113 sclp_facilities = sccb->facilities;
114 sclp_fac84 = sccb->fac84;
115 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
116 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
117 rzm <<= 20;
118 }
119
120 unsigned long long sclp_get_rnmax(void)
121 {
122 return rnmax;
123 }
124
125 unsigned long long sclp_get_rzm(void)
126 {
127 return rzm;
128 }
129
130 /*
131 * This function will be called after sclp_facilities_detect(), which gets
132 * called from early.c code. Therefore the sccb should have valid contents.
133 */
134 void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
135 {
136 struct read_info_sccb *sccb;
137
138 if (!early_read_info_sccb_valid)
139 return;
140 sccb = &early_read_info_sccb;
141 info->is_valid = 1;
142 if (sccb->flags & 0x2)
143 info->has_dump = 1;
144 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
145 }
146
147 static void sclp_sync_callback(struct sclp_req *req, void *data)
148 {
149 struct completion *completion = data;
150
151 complete(completion);
152 }
153
154 static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
155 {
156 struct completion completion;
157 struct sclp_req *request;
158 int rc;
159
160 request = kzalloc(sizeof(*request), GFP_KERNEL);
161 if (!request)
162 return -ENOMEM;
163 request->command = cmd;
164 request->sccb = sccb;
165 request->status = SCLP_REQ_FILLED;
166 request->callback = sclp_sync_callback;
167 request->callback_data = &completion;
168 init_completion(&completion);
169
170 /* Perform sclp request. */
171 rc = sclp_add_request(request);
172 if (rc)
173 goto out;
174 wait_for_completion(&completion);
175
176 /* Check response. */
177 if (request->status != SCLP_REQ_DONE) {
178 pr_warning("sync request failed (cmd=0x%08x, "
179 "status=0x%02x)\n", cmd, request->status);
180 rc = -EIO;
181 }
182 out:
183 kfree(request);
184 return rc;
185 }
186
187 /*
188 * CPU configuration related functions.
189 */
190
191 #define SCLP_CMDW_READ_CPU_INFO 0x00010001
192 #define SCLP_CMDW_CONFIGURE_CPU 0x00110001
193 #define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
194
195 struct read_cpu_info_sccb {
196 struct sccb_header header;
197 u16 nr_configured;
198 u16 offset_configured;
199 u16 nr_standby;
200 u16 offset_standby;
201 u8 reserved[4096 - 16];
202 } __attribute__((packed, aligned(PAGE_SIZE)));
203
204 static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
205 struct read_cpu_info_sccb *sccb)
206 {
207 char *page = (char *) sccb;
208
209 memset(info, 0, sizeof(*info));
210 info->configured = sccb->nr_configured;
211 info->standby = sccb->nr_standby;
212 info->combined = sccb->nr_configured + sccb->nr_standby;
213 info->has_cpu_type = sclp_fac84 & 0x1;
214 memcpy(&info->cpu, page + sccb->offset_configured,
215 info->combined * sizeof(struct sclp_cpu_entry));
216 }
217
218 int sclp_get_cpu_info(struct sclp_cpu_info *info)
219 {
220 int rc;
221 struct read_cpu_info_sccb *sccb;
222
223 if (!SCLP_HAS_CPU_INFO)
224 return -EOPNOTSUPP;
225 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
226 if (!sccb)
227 return -ENOMEM;
228 sccb->header.length = sizeof(*sccb);
229 rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
230 if (rc)
231 goto out;
232 if (sccb->header.response_code != 0x0010) {
233 pr_warning("readcpuinfo failed (response=0x%04x)\n",
234 sccb->header.response_code);
235 rc = -EIO;
236 goto out;
237 }
238 sclp_fill_cpu_info(info, sccb);
239 out:
240 free_page((unsigned long) sccb);
241 return rc;
242 }
243
244 struct cpu_configure_sccb {
245 struct sccb_header header;
246 } __attribute__((packed, aligned(8)));
247
248 static int do_cpu_configure(sclp_cmdw_t cmd)
249 {
250 struct cpu_configure_sccb *sccb;
251 int rc;
252
253 if (!SCLP_HAS_CPU_RECONFIG)
254 return -EOPNOTSUPP;
255 /*
256 * This is not going to cross a page boundary since we force
257 * kmalloc to have a minimum alignment of 8 bytes on s390.
258 */
259 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
260 if (!sccb)
261 return -ENOMEM;
262 sccb->header.length = sizeof(*sccb);
263 rc = do_sync_request(cmd, sccb);
264 if (rc)
265 goto out;
266 switch (sccb->header.response_code) {
267 case 0x0020:
268 case 0x0120:
269 break;
270 default:
271 pr_warning("configure cpu failed (cmd=0x%08x, "
272 "response=0x%04x)\n", cmd,
273 sccb->header.response_code);
274 rc = -EIO;
275 break;
276 }
277 out:
278 kfree(sccb);
279 return rc;
280 }
281
282 int sclp_cpu_configure(u8 cpu)
283 {
284 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
285 }
286
287 int sclp_cpu_deconfigure(u8 cpu)
288 {
289 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
290 }
291
292 #ifdef CONFIG_MEMORY_HOTPLUG
293
294 static DEFINE_MUTEX(sclp_mem_mutex);
295 static LIST_HEAD(sclp_mem_list);
296 static u8 sclp_max_storage_id;
297 static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
298 static int sclp_mem_state_changed;
299
300 struct memory_increment {
301 struct list_head list;
302 u16 rn;
303 int standby;
304 int usecount;
305 };
306
307 struct assign_storage_sccb {
308 struct sccb_header header;
309 u16 rn;
310 } __packed;
311
312 int arch_get_memory_phys_device(unsigned long start_pfn)
313 {
314 if (!rzm)
315 return 0;
316 return PFN_PHYS(start_pfn) >> ilog2(rzm);
317 }
318
319 static unsigned long long rn2addr(u16 rn)
320 {
321 return (unsigned long long) (rn - 1) * rzm;
322 }
323
324 static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
325 {
326 struct assign_storage_sccb *sccb;
327 int rc;
328
329 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
330 if (!sccb)
331 return -ENOMEM;
332 sccb->header.length = PAGE_SIZE;
333 sccb->rn = rn;
334 rc = do_sync_request(cmd, sccb);
335 if (rc)
336 goto out;
337 switch (sccb->header.response_code) {
338 case 0x0020:
339 case 0x0120:
340 break;
341 default:
342 pr_warning("assign storage failed (cmd=0x%08x, "
343 "response=0x%04x, rn=0x%04x)\n", cmd,
344 sccb->header.response_code, rn);
345 rc = -EIO;
346 break;
347 }
348 out:
349 free_page((unsigned long) sccb);
350 return rc;
351 }
352
353 static int sclp_assign_storage(u16 rn)
354 {
355 return do_assign_storage(0x000d0001, rn);
356 }
357
358 static int sclp_unassign_storage(u16 rn)
359 {
360 return do_assign_storage(0x000c0001, rn);
361 }
362
363 struct attach_storage_sccb {
364 struct sccb_header header;
365 u16 :16;
366 u16 assigned;
367 u32 :32;
368 u32 entries[0];
369 } __packed;
370
371 static int sclp_attach_storage(u8 id)
372 {
373 struct attach_storage_sccb *sccb;
374 int rc;
375 int i;
376
377 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
378 if (!sccb)
379 return -ENOMEM;
380 sccb->header.length = PAGE_SIZE;
381 rc = do_sync_request(0x00080001 | id << 8, sccb);
382 if (rc)
383 goto out;
384 switch (sccb->header.response_code) {
385 case 0x0020:
386 set_bit(id, sclp_storage_ids);
387 for (i = 0; i < sccb->assigned; i++) {
388 if (sccb->entries[i])
389 sclp_unassign_storage(sccb->entries[i] >> 16);
390 }
391 break;
392 default:
393 rc = -EIO;
394 break;
395 }
396 out:
397 free_page((unsigned long) sccb);
398 return rc;
399 }
400
401 static int sclp_mem_change_state(unsigned long start, unsigned long size,
402 int online)
403 {
404 struct memory_increment *incr;
405 unsigned long long istart;
406 int rc = 0;
407
408 list_for_each_entry(incr, &sclp_mem_list, list) {
409 istart = rn2addr(incr->rn);
410 if (start + size - 1 < istart)
411 break;
412 if (start > istart + rzm - 1)
413 continue;
414 if (online) {
415 if (incr->usecount++)
416 continue;
417 /*
418 * Don't break the loop if one assign fails. Loop may
419 * be walked again on CANCEL and we can't save
420 * information if state changed before or not.
421 * So continue and increase usecount for all increments.
422 */
423 rc |= sclp_assign_storage(incr->rn);
424 } else {
425 if (--incr->usecount)
426 continue;
427 sclp_unassign_storage(incr->rn);
428 }
429 }
430 return rc ? -EIO : 0;
431 }
432
433 static int sclp_mem_notifier(struct notifier_block *nb,
434 unsigned long action, void *data)
435 {
436 unsigned long start, size;
437 struct memory_notify *arg;
438 unsigned char id;
439 int rc = 0;
440
441 arg = data;
442 start = arg->start_pfn << PAGE_SHIFT;
443 size = arg->nr_pages << PAGE_SHIFT;
444 mutex_lock(&sclp_mem_mutex);
445 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
446 sclp_attach_storage(id);
447 switch (action) {
448 case MEM_ONLINE:
449 case MEM_GOING_OFFLINE:
450 case MEM_CANCEL_OFFLINE:
451 break;
452 case MEM_GOING_ONLINE:
453 rc = sclp_mem_change_state(start, size, 1);
454 break;
455 case MEM_CANCEL_ONLINE:
456 sclp_mem_change_state(start, size, 0);
457 break;
458 case MEM_OFFLINE:
459 sclp_mem_change_state(start, size, 0);
460 break;
461 default:
462 rc = -EINVAL;
463 break;
464 }
465 if (!rc)
466 sclp_mem_state_changed = 1;
467 mutex_unlock(&sclp_mem_mutex);
468 return rc ? NOTIFY_BAD : NOTIFY_OK;
469 }
470
471 static struct notifier_block sclp_mem_nb = {
472 .notifier_call = sclp_mem_notifier,
473 };
474
475 static void __init add_memory_merged(u16 rn)
476 {
477 static u16 first_rn, num;
478 unsigned long long start, size;
479
480 if (rn && first_rn && (first_rn + num == rn)) {
481 num++;
482 return;
483 }
484 if (!first_rn)
485 goto skip_add;
486 start = rn2addr(first_rn);
487 size = (unsigned long long ) num * rzm;
488 if (start >= VMEM_MAX_PHYS)
489 goto skip_add;
490 if (start + size > VMEM_MAX_PHYS)
491 size = VMEM_MAX_PHYS - start;
492 if (memory_end_set && (start >= memory_end))
493 goto skip_add;
494 if (memory_end_set && (start + size > memory_end))
495 size = memory_end - start;
496 add_memory(0, start, size);
497 skip_add:
498 first_rn = rn;
499 num = 1;
500 }
501
502 static void __init sclp_add_standby_memory(void)
503 {
504 struct memory_increment *incr;
505
506 list_for_each_entry(incr, &sclp_mem_list, list)
507 if (incr->standby)
508 add_memory_merged(incr->rn);
509 add_memory_merged(0);
510 }
511
512 #define MEM_SCT_SIZE (1UL << SECTION_SIZE_BITS)
513
514 static void __init insert_increment(u16 rn, int standby, int assigned)
515 {
516 struct memory_increment *incr, *new_incr;
517 struct list_head *prev;
518 u16 last_rn;
519
520 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
521 if (!new_incr)
522 return;
523 new_incr->rn = rn;
524 new_incr->standby = standby;
525 if (!standby)
526 new_incr->usecount = rzm > MEM_SCT_SIZE ? rzm/MEM_SCT_SIZE : 1;
527 last_rn = 0;
528 prev = &sclp_mem_list;
529 list_for_each_entry(incr, &sclp_mem_list, list) {
530 if (assigned && incr->rn > rn)
531 break;
532 if (!assigned && incr->rn - last_rn > 1)
533 break;
534 last_rn = incr->rn;
535 prev = &incr->list;
536 }
537 if (!assigned)
538 new_incr->rn = last_rn + 1;
539 if (new_incr->rn > rnmax) {
540 kfree(new_incr);
541 return;
542 }
543 list_add(&new_incr->list, prev);
544 }
545
546 static int sclp_mem_freeze(struct device *dev)
547 {
548 if (!sclp_mem_state_changed)
549 return 0;
550 pr_err("Memory hotplug state changed, suspend refused.\n");
551 return -EPERM;
552 }
553
554 struct read_storage_sccb {
555 struct sccb_header header;
556 u16 max_id;
557 u16 assigned;
558 u16 standby;
559 u16 :16;
560 u32 entries[0];
561 } __packed;
562
563 static const struct dev_pm_ops sclp_mem_pm_ops = {
564 .freeze = sclp_mem_freeze,
565 };
566
567 static struct platform_driver sclp_mem_pdrv = {
568 .driver = {
569 .name = "sclp_mem",
570 .pm = &sclp_mem_pm_ops,
571 },
572 };
573
574 static int __init sclp_detect_standby_memory(void)
575 {
576 struct platform_device *sclp_pdev;
577 struct read_storage_sccb *sccb;
578 int i, id, assigned, rc;
579
580 if (!early_read_info_sccb_valid)
581 return 0;
582 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
583 return 0;
584 rc = -ENOMEM;
585 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
586 if (!sccb)
587 goto out;
588 assigned = 0;
589 for (id = 0; id <= sclp_max_storage_id; id++) {
590 memset(sccb, 0, PAGE_SIZE);
591 sccb->header.length = PAGE_SIZE;
592 rc = do_sync_request(0x00040001 | id << 8, sccb);
593 if (rc)
594 goto out;
595 switch (sccb->header.response_code) {
596 case 0x0010:
597 set_bit(id, sclp_storage_ids);
598 for (i = 0; i < sccb->assigned; i++) {
599 if (!sccb->entries[i])
600 continue;
601 assigned++;
602 insert_increment(sccb->entries[i] >> 16, 0, 1);
603 }
604 break;
605 case 0x0310:
606 break;
607 case 0x0410:
608 for (i = 0; i < sccb->assigned; i++) {
609 if (!sccb->entries[i])
610 continue;
611 assigned++;
612 insert_increment(sccb->entries[i] >> 16, 1, 1);
613 }
614 break;
615 default:
616 rc = -EIO;
617 break;
618 }
619 if (!rc)
620 sclp_max_storage_id = sccb->max_id;
621 }
622 if (rc || list_empty(&sclp_mem_list))
623 goto out;
624 for (i = 1; i <= rnmax - assigned; i++)
625 insert_increment(0, 1, 0);
626 rc = register_memory_notifier(&sclp_mem_nb);
627 if (rc)
628 goto out;
629 rc = platform_driver_register(&sclp_mem_pdrv);
630 if (rc)
631 goto out;
632 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
633 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
634 if (rc)
635 goto out_driver;
636 sclp_add_standby_memory();
637 goto out;
638 out_driver:
639 platform_driver_unregister(&sclp_mem_pdrv);
640 out:
641 free_page((unsigned long) sccb);
642 return rc;
643 }
644 __initcall(sclp_detect_standby_memory);
645
646 #endif /* CONFIG_MEMORY_HOTPLUG */
647
648 /*
649 * Channel path configuration related functions.
650 */
651
652 #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
653 #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
654 #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
655
656 struct chp_cfg_sccb {
657 struct sccb_header header;
658 u8 ccm;
659 u8 reserved[6];
660 u8 cssid;
661 } __attribute__((packed));
662
663 static int do_chp_configure(sclp_cmdw_t cmd)
664 {
665 struct chp_cfg_sccb *sccb;
666 int rc;
667
668 if (!SCLP_HAS_CHP_RECONFIG)
669 return -EOPNOTSUPP;
670 /* Prepare sccb. */
671 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
672 if (!sccb)
673 return -ENOMEM;
674 sccb->header.length = sizeof(*sccb);
675 rc = do_sync_request(cmd, sccb);
676 if (rc)
677 goto out;
678 switch (sccb->header.response_code) {
679 case 0x0020:
680 case 0x0120:
681 case 0x0440:
682 case 0x0450:
683 break;
684 default:
685 pr_warning("configure channel-path failed "
686 "(cmd=0x%08x, response=0x%04x)\n", cmd,
687 sccb->header.response_code);
688 rc = -EIO;
689 break;
690 }
691 out:
692 free_page((unsigned long) sccb);
693 return rc;
694 }
695
696 /**
697 * sclp_chp_configure - perform configure channel-path sclp command
698 * @chpid: channel-path ID
699 *
700 * Perform configure channel-path command sclp command for specified chpid.
701 * Return 0 after command successfully finished, non-zero otherwise.
702 */
703 int sclp_chp_configure(struct chp_id chpid)
704 {
705 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
706 }
707
708 /**
709 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
710 * @chpid: channel-path ID
711 *
712 * Perform deconfigure channel-path command sclp command for specified chpid
713 * and wait for completion. On success return 0. Return non-zero otherwise.
714 */
715 int sclp_chp_deconfigure(struct chp_id chpid)
716 {
717 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
718 }
719
720 struct chp_info_sccb {
721 struct sccb_header header;
722 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
723 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
724 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
725 u8 ccm;
726 u8 reserved[6];
727 u8 cssid;
728 } __attribute__((packed));
729
730 /**
731 * sclp_chp_read_info - perform read channel-path information sclp command
732 * @info: resulting channel-path information data
733 *
734 * Perform read channel-path information sclp command and wait for completion.
735 * On success, store channel-path information in @info and return 0. Return
736 * non-zero otherwise.
737 */
738 int sclp_chp_read_info(struct sclp_chp_info *info)
739 {
740 struct chp_info_sccb *sccb;
741 int rc;
742
743 if (!SCLP_HAS_CHP_INFO)
744 return -EOPNOTSUPP;
745 /* Prepare sccb. */
746 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
747 if (!sccb)
748 return -ENOMEM;
749 sccb->header.length = sizeof(*sccb);
750 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
751 if (rc)
752 goto out;
753 if (sccb->header.response_code != 0x0010) {
754 pr_warning("read channel-path info failed "
755 "(response=0x%04x)\n", sccb->header.response_code);
756 rc = -EIO;
757 goto out;
758 }
759 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
760 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
761 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
762 out:
763 free_page((unsigned long) sccb);
764 return rc;
765 }
Linux with added FPC-III support