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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/export.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18#include <linux/mm.h>
19#include <linux/mmzone.h>
20#include <linux/memory.h>
21#include <linux/module.h>
22#include <linux/platform_device.h>
23#include <asm/ctl_reg.h>
24#include <asm/chpid.h>
25#include <asm/setup.h>
26#include <asm/page.h>
27#include <asm/sclp.h>
28
29#include "sclp.h"
30
31#define SCLP_CMDW_READ_SCP_INFO 0x00020001
32#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
33
34struct read_info_sccb {
35 struct sccb_header header;
36 u16 rnmax;
37 u8 rnsize;
38 u8 _reserved0[24 - 11];
39 u8 loadparm[8];
40 u8 _reserved1[48 - 32];
41 u64 facilities;
42 u8 _reserved2[84 - 56];
43 u8 fac84;
44 u8 fac85;
45 u8 _reserved3[91 - 86];
46 u8 flags;
47 u8 _reserved4[100 - 92];
48 u32 rnsize2;
49 u64 rnmax2;
50 u8 _reserved5[4096 - 112];
51} __attribute__((packed, aligned(PAGE_SIZE)));
52
53static struct init_sccb __initdata early_event_mask_sccb __aligned(PAGE_SIZE);
54static struct read_info_sccb __initdata early_read_info_sccb;
55static int __initdata early_read_info_sccb_valid;
56
57u64 sclp_facilities;
58static u8 sclp_fac84;
59static unsigned long long rzm;
60static unsigned long long rnmax;
61
62static int __init sclp_cmd_sync_early(sclp_cmdw_t cmd, void *sccb)
63{
64 int rc;
65
66 __ctl_set_bit(0, 9);
67 rc = sclp_service_call(cmd, sccb);
68 if (rc)
69 goto out;
70 __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA |
71 PSW_MASK_BA | PSW_MASK_EXT | PSW_MASK_WAIT);
72 local_irq_disable();
73out:
74
75 barrier();
76 __ctl_clear_bit(0, 9);
77 return rc;
78}
79
80static void __init sclp_read_info_early(void)
81{
82 int rc;
83 int i;
84 struct read_info_sccb *sccb;
85 sclp_cmdw_t commands[] = {SCLP_CMDW_READ_SCP_INFO_FORCED,
86 SCLP_CMDW_READ_SCP_INFO};
87
88 sccb = &early_read_info_sccb;
89 for (i = 0; i < ARRAY_SIZE(commands); i++) {
90 do {
91 memset(sccb, 0, sizeof(*sccb));
92 sccb->header.length = sizeof(*sccb);
93 sccb->header.function_code = 0x80;
94 sccb->header.control_mask[2] = 0x80;
95 rc = sclp_cmd_sync_early(commands[i], sccb);
96 } while (rc == -EBUSY);
97
98 if (rc)
99 break;
100 if (sccb->header.response_code == 0x10) {
101 early_read_info_sccb_valid = 1;
102 break;
103 }
104 if (sccb->header.response_code != 0x1f0)
105 break;
106 }
107}
108
109static void __init sclp_event_mask_early(void)
110{
111 struct init_sccb *sccb = &early_event_mask_sccb;
112 int rc;
113
114 do {
115 memset(sccb, 0, sizeof(*sccb));
116 sccb->header.length = sizeof(*sccb);
117 sccb->mask_length = sizeof(sccb_mask_t);
118 rc = sclp_cmd_sync_early(SCLP_CMDW_WRITE_EVENT_MASK, sccb);
119 } while (rc == -EBUSY);
120}
121
122void __init sclp_facilities_detect(void)
123{
124 struct read_info_sccb *sccb;
125
126 sclp_read_info_early();
127 if (!early_read_info_sccb_valid)
128 return;
129
130 sccb = &early_read_info_sccb;
131 sclp_facilities = sccb->facilities;
132 sclp_fac84 = sccb->fac84;
133 if (sccb->fac85 & 0x02)
134 S390_lowcore.machine_flags |= MACHINE_FLAG_ESOP;
135 rnmax = sccb->rnmax ? sccb->rnmax : sccb->rnmax2;
136 rzm = sccb->rnsize ? sccb->rnsize : sccb->rnsize2;
137 rzm <<= 20;
138
139 sclp_event_mask_early();
140}
141
142bool __init sclp_has_linemode(void)
143{
144 struct init_sccb *sccb = &early_event_mask_sccb;
145
146 if (sccb->header.response_code != 0x20)
147 return 0;
148 if (sccb->sclp_send_mask & (EVTYP_MSG_MASK | EVTYP_PMSGCMD_MASK))
149 return 1;
150 return 0;
151}
152
153bool __init sclp_has_vt220(void)
154{
155 struct init_sccb *sccb = &early_event_mask_sccb;
156
157 if (sccb->header.response_code != 0x20)
158 return 0;
159 if (sccb->sclp_send_mask & EVTYP_VT220MSG_MASK)
160 return 1;
161 return 0;
162}
163
164unsigned long long sclp_get_rnmax(void)
165{
166 return rnmax;
167}
168
169unsigned long long sclp_get_rzm(void)
170{
171 return rzm;
172}
173
174
175
176
177
178void __init sclp_get_ipl_info(struct sclp_ipl_info *info)
179{
180 struct read_info_sccb *sccb;
181
182 if (!early_read_info_sccb_valid)
183 return;
184 sccb = &early_read_info_sccb;
185 info->is_valid = 1;
186 if (sccb->flags & 0x2)
187 info->has_dump = 1;
188 memcpy(&info->loadparm, &sccb->loadparm, LOADPARM_LEN);
189}
190
191static void sclp_sync_callback(struct sclp_req *req, void *data)
192{
193 struct completion *completion = data;
194
195 complete(completion);
196}
197
198int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
199{
200 struct completion completion;
201 struct sclp_req *request;
202 int rc;
203
204 request = kzalloc(sizeof(*request), GFP_KERNEL);
205 if (!request)
206 return -ENOMEM;
207 request->command = cmd;
208 request->sccb = sccb;
209 request->status = SCLP_REQ_FILLED;
210 request->callback = sclp_sync_callback;
211 request->callback_data = &completion;
212 init_completion(&completion);
213
214
215 rc = sclp_add_request(request);
216 if (rc)
217 goto out;
218 wait_for_completion(&completion);
219
220
221 if (request->status != SCLP_REQ_DONE) {
222 pr_warning("sync request failed (cmd=0x%08x, "
223 "status=0x%02x)\n", cmd, request->status);
224 rc = -EIO;
225 }
226out:
227 kfree(request);
228 return rc;
229}
230
231
232
233
234
235#define SCLP_CMDW_READ_CPU_INFO 0x00010001
236#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
237#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
238
239struct read_cpu_info_sccb {
240 struct sccb_header header;
241 u16 nr_configured;
242 u16 offset_configured;
243 u16 nr_standby;
244 u16 offset_standby;
245 u8 reserved[4096 - 16];
246} __attribute__((packed, aligned(PAGE_SIZE)));
247
248static void sclp_fill_cpu_info(struct sclp_cpu_info *info,
249 struct read_cpu_info_sccb *sccb)
250{
251 char *page = (char *) sccb;
252
253 memset(info, 0, sizeof(*info));
254 info->configured = sccb->nr_configured;
255 info->standby = sccb->nr_standby;
256 info->combined = sccb->nr_configured + sccb->nr_standby;
257 info->has_cpu_type = sclp_fac84 & 0x1;
258 memcpy(&info->cpu, page + sccb->offset_configured,
259 info->combined * sizeof(struct sclp_cpu_entry));
260}
261
262int sclp_get_cpu_info(struct sclp_cpu_info *info)
263{
264 int rc;
265 struct read_cpu_info_sccb *sccb;
266
267 if (!SCLP_HAS_CPU_INFO)
268 return -EOPNOTSUPP;
269 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
270 if (!sccb)
271 return -ENOMEM;
272 sccb->header.length = sizeof(*sccb);
273 rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
274 if (rc)
275 goto out;
276 if (sccb->header.response_code != 0x0010) {
277 pr_warning("readcpuinfo failed (response=0x%04x)\n",
278 sccb->header.response_code);
279 rc = -EIO;
280 goto out;
281 }
282 sclp_fill_cpu_info(info, sccb);
283out:
284 free_page((unsigned long) sccb);
285 return rc;
286}
287
288struct cpu_configure_sccb {
289 struct sccb_header header;
290} __attribute__((packed, aligned(8)));
291
292static int do_cpu_configure(sclp_cmdw_t cmd)
293{
294 struct cpu_configure_sccb *sccb;
295 int rc;
296
297 if (!SCLP_HAS_CPU_RECONFIG)
298 return -EOPNOTSUPP;
299
300
301
302
303 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
304 if (!sccb)
305 return -ENOMEM;
306 sccb->header.length = sizeof(*sccb);
307 rc = sclp_sync_request(cmd, sccb);
308 if (rc)
309 goto out;
310 switch (sccb->header.response_code) {
311 case 0x0020:
312 case 0x0120:
313 break;
314 default:
315 pr_warning("configure cpu failed (cmd=0x%08x, "
316 "response=0x%04x)\n", cmd,
317 sccb->header.response_code);
318 rc = -EIO;
319 break;
320 }
321out:
322 kfree(sccb);
323 return rc;
324}
325
326int sclp_cpu_configure(u8 cpu)
327{
328 return do_cpu_configure(SCLP_CMDW_CONFIGURE_CPU | cpu << 8);
329}
330
331int sclp_cpu_deconfigure(u8 cpu)
332{
333 return do_cpu_configure(SCLP_CMDW_DECONFIGURE_CPU | cpu << 8);
334}
335
336#ifdef CONFIG_MEMORY_HOTPLUG
337
338static DEFINE_MUTEX(sclp_mem_mutex);
339static LIST_HEAD(sclp_mem_list);
340static u8 sclp_max_storage_id;
341static unsigned long sclp_storage_ids[256 / BITS_PER_LONG];
342static int sclp_mem_state_changed;
343
344struct memory_increment {
345 struct list_head list;
346 u16 rn;
347 int standby;
348};
349
350struct assign_storage_sccb {
351 struct sccb_header header;
352 u16 rn;
353} __packed;
354
355int arch_get_memory_phys_device(unsigned long start_pfn)
356{
357 if (!rzm)
358 return 0;
359 return PFN_PHYS(start_pfn) >> ilog2(rzm);
360}
361
362static unsigned long long rn2addr(u16 rn)
363{
364 return (unsigned long long) (rn - 1) * rzm;
365}
366
367static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
368{
369 struct assign_storage_sccb *sccb;
370 int rc;
371
372 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
373 if (!sccb)
374 return -ENOMEM;
375 sccb->header.length = PAGE_SIZE;
376 sccb->rn = rn;
377 rc = sclp_sync_request(cmd, sccb);
378 if (rc)
379 goto out;
380 switch (sccb->header.response_code) {
381 case 0x0020:
382 case 0x0120:
383 break;
384 default:
385 pr_warning("assign storage failed (cmd=0x%08x, "
386 "response=0x%04x, rn=0x%04x)\n", cmd,
387 sccb->header.response_code, rn);
388 rc = -EIO;
389 break;
390 }
391out:
392 free_page((unsigned long) sccb);
393 return rc;
394}
395
396static int sclp_assign_storage(u16 rn)
397{
398 unsigned long long start;
399 int rc;
400
401 rc = do_assign_storage(0x000d0001, rn);
402 if (rc)
403 return rc;
404 start = rn2addr(rn);
405 storage_key_init_range(start, start + rzm);
406 return 0;
407}
408
409static int sclp_unassign_storage(u16 rn)
410{
411 return do_assign_storage(0x000c0001, rn);
412}
413
414struct attach_storage_sccb {
415 struct sccb_header header;
416 u16 :16;
417 u16 assigned;
418 u32 :32;
419 u32 entries[0];
420} __packed;
421
422static int sclp_attach_storage(u8 id)
423{
424 struct attach_storage_sccb *sccb;
425 int rc;
426 int i;
427
428 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
429 if (!sccb)
430 return -ENOMEM;
431 sccb->header.length = PAGE_SIZE;
432 rc = sclp_sync_request(0x00080001 | id << 8, sccb);
433 if (rc)
434 goto out;
435 switch (sccb->header.response_code) {
436 case 0x0020:
437 set_bit(id, sclp_storage_ids);
438 for (i = 0; i < sccb->assigned; i++) {
439 if (sccb->entries[i])
440 sclp_unassign_storage(sccb->entries[i] >> 16);
441 }
442 break;
443 default:
444 rc = -EIO;
445 break;
446 }
447out:
448 free_page((unsigned long) sccb);
449 return rc;
450}
451
452static int sclp_mem_change_state(unsigned long start, unsigned long size,
453 int online)
454{
455 struct memory_increment *incr;
456 unsigned long long istart;
457 int rc = 0;
458
459 list_for_each_entry(incr, &sclp_mem_list, list) {
460 istart = rn2addr(incr->rn);
461 if (start + size - 1 < istart)
462 break;
463 if (start > istart + rzm - 1)
464 continue;
465 if (online)
466 rc |= sclp_assign_storage(incr->rn);
467 else
468 sclp_unassign_storage(incr->rn);
469 }
470 return rc ? -EIO : 0;
471}
472
473static int sclp_mem_notifier(struct notifier_block *nb,
474 unsigned long action, void *data)
475{
476 unsigned long start, size;
477 struct memory_notify *arg;
478 unsigned char id;
479 int rc = 0;
480
481 arg = data;
482 start = arg->start_pfn << PAGE_SHIFT;
483 size = arg->nr_pages << PAGE_SHIFT;
484 mutex_lock(&sclp_mem_mutex);
485 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
486 sclp_attach_storage(id);
487 switch (action) {
488 case MEM_ONLINE:
489 case MEM_GOING_OFFLINE:
490 case MEM_CANCEL_OFFLINE:
491 break;
492 case MEM_GOING_ONLINE:
493 rc = sclp_mem_change_state(start, size, 1);
494 break;
495 case MEM_CANCEL_ONLINE:
496 sclp_mem_change_state(start, size, 0);
497 break;
498 case MEM_OFFLINE:
499 sclp_mem_change_state(start, size, 0);
500 break;
501 default:
502 rc = -EINVAL;
503 break;
504 }
505 if (!rc)
506 sclp_mem_state_changed = 1;
507 mutex_unlock(&sclp_mem_mutex);
508 return rc ? NOTIFY_BAD : NOTIFY_OK;
509}
510
511static struct notifier_block sclp_mem_nb = {
512 .notifier_call = sclp_mem_notifier,
513};
514
515static void __init add_memory_merged(u16 rn)
516{
517 static u16 first_rn, num;
518 unsigned long long start, size;
519
520 if (rn && first_rn && (first_rn + num == rn)) {
521 num++;
522 return;
523 }
524 if (!first_rn)
525 goto skip_add;
526 start = rn2addr(first_rn);
527 size = (unsigned long long ) num * rzm;
528 if (start >= VMEM_MAX_PHYS)
529 goto skip_add;
530 if (start + size > VMEM_MAX_PHYS)
531 size = VMEM_MAX_PHYS - start;
532 if (memory_end_set && (start >= memory_end))
533 goto skip_add;
534 if (memory_end_set && (start + size > memory_end))
535 size = memory_end - start;
536 add_memory(0, start, size);
537skip_add:
538 first_rn = rn;
539 num = 1;
540}
541
542static void __init sclp_add_standby_memory(void)
543{
544 struct memory_increment *incr;
545
546 list_for_each_entry(incr, &sclp_mem_list, list)
547 if (incr->standby)
548 add_memory_merged(incr->rn);
549 add_memory_merged(0);
550}
551
552static void __init insert_increment(u16 rn, int standby, int assigned)
553{
554 struct memory_increment *incr, *new_incr;
555 struct list_head *prev;
556 u16 last_rn;
557
558 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
559 if (!new_incr)
560 return;
561 new_incr->rn = rn;
562 new_incr->standby = standby;
563 last_rn = 0;
564 prev = &sclp_mem_list;
565 list_for_each_entry(incr, &sclp_mem_list, list) {
566 if (assigned && incr->rn > rn)
567 break;
568 if (!assigned && incr->rn - last_rn > 1)
569 break;
570 last_rn = incr->rn;
571 prev = &incr->list;
572 }
573 if (!assigned)
574 new_incr->rn = last_rn + 1;
575 if (new_incr->rn > rnmax) {
576 kfree(new_incr);
577 return;
578 }
579 list_add(&new_incr->list, prev);
580}
581
582static int sclp_mem_freeze(struct device *dev)
583{
584 if (!sclp_mem_state_changed)
585 return 0;
586 pr_err("Memory hotplug state changed, suspend refused.\n");
587 return -EPERM;
588}
589
590struct read_storage_sccb {
591 struct sccb_header header;
592 u16 max_id;
593 u16 assigned;
594 u16 standby;
595 u16 :16;
596 u32 entries[0];
597} __packed;
598
599static const struct dev_pm_ops sclp_mem_pm_ops = {
600 .freeze = sclp_mem_freeze,
601};
602
603static struct platform_driver sclp_mem_pdrv = {
604 .driver = {
605 .name = "sclp_mem",
606 .pm = &sclp_mem_pm_ops,
607 },
608};
609
610static int __init sclp_detect_standby_memory(void)
611{
612 struct platform_device *sclp_pdev;
613 struct read_storage_sccb *sccb;
614 int i, id, assigned, rc;
615
616 if (OLDMEM_BASE)
617 return 0;
618 if (!early_read_info_sccb_valid)
619 return 0;
620 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
621 return 0;
622 rc = -ENOMEM;
623 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
624 if (!sccb)
625 goto out;
626 assigned = 0;
627 for (id = 0; id <= sclp_max_storage_id; id++) {
628 memset(sccb, 0, PAGE_SIZE);
629 sccb->header.length = PAGE_SIZE;
630 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
631 if (rc)
632 goto out;
633 switch (sccb->header.response_code) {
634 case 0x0010:
635 set_bit(id, sclp_storage_ids);
636 for (i = 0; i < sccb->assigned; i++) {
637 if (!sccb->entries[i])
638 continue;
639 assigned++;
640 insert_increment(sccb->entries[i] >> 16, 0, 1);
641 }
642 break;
643 case 0x0310:
644 break;
645 case 0x0410:
646 for (i = 0; i < sccb->assigned; i++) {
647 if (!sccb->entries[i])
648 continue;
649 assigned++;
650 insert_increment(sccb->entries[i] >> 16, 1, 1);
651 }
652 break;
653 default:
654 rc = -EIO;
655 break;
656 }
657 if (!rc)
658 sclp_max_storage_id = sccb->max_id;
659 }
660 if (rc || list_empty(&sclp_mem_list))
661 goto out;
662 for (i = 1; i <= rnmax - assigned; i++)
663 insert_increment(0, 1, 0);
664 rc = register_memory_notifier(&sclp_mem_nb);
665 if (rc)
666 goto out;
667 rc = platform_driver_register(&sclp_mem_pdrv);
668 if (rc)
669 goto out;
670 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
671 rc = PTR_RET(sclp_pdev);
672 if (rc)
673 goto out_driver;
674 sclp_add_standby_memory();
675 goto out;
676out_driver:
677 platform_driver_unregister(&sclp_mem_pdrv);
678out:
679 free_page((unsigned long) sccb);
680 return rc;
681}
682__initcall(sclp_detect_standby_memory);
683
684#endif
685
686
687
688
689#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
690#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
691
692#define SCLP_RECONFIG_PCI_ATPYE 2
693
694struct pci_cfg_sccb {
695 struct sccb_header header;
696 u8 atype;
697 u8 reserved1;
698 u16 reserved2;
699 u32 aid;
700} __packed;
701
702static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
703{
704 struct pci_cfg_sccb *sccb;
705 int rc;
706
707 if (!SCLP_HAS_PCI_RECONFIG)
708 return -EOPNOTSUPP;
709
710 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
711 if (!sccb)
712 return -ENOMEM;
713
714 sccb->header.length = PAGE_SIZE;
715 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
716 sccb->aid = fid;
717 rc = sclp_sync_request(cmd, sccb);
718 if (rc)
719 goto out;
720 switch (sccb->header.response_code) {
721 case 0x0020:
722 case 0x0120:
723 break;
724 default:
725 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
726 cmd, sccb->header.response_code);
727 rc = -EIO;
728 break;
729 }
730out:
731 free_page((unsigned long) sccb);
732 return rc;
733}
734
735int sclp_pci_configure(u32 fid)
736{
737 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
738}
739EXPORT_SYMBOL(sclp_pci_configure);
740
741int sclp_pci_deconfigure(u32 fid)
742{
743 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
744}
745EXPORT_SYMBOL(sclp_pci_deconfigure);
746
747
748
749
750
751#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
752#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
753#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
754
755struct chp_cfg_sccb {
756 struct sccb_header header;
757 u8 ccm;
758 u8 reserved[6];
759 u8 cssid;
760} __attribute__((packed));
761
762static int do_chp_configure(sclp_cmdw_t cmd)
763{
764 struct chp_cfg_sccb *sccb;
765 int rc;
766
767 if (!SCLP_HAS_CHP_RECONFIG)
768 return -EOPNOTSUPP;
769
770 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
771 if (!sccb)
772 return -ENOMEM;
773 sccb->header.length = sizeof(*sccb);
774 rc = sclp_sync_request(cmd, sccb);
775 if (rc)
776 goto out;
777 switch (sccb->header.response_code) {
778 case 0x0020:
779 case 0x0120:
780 case 0x0440:
781 case 0x0450:
782 break;
783 default:
784 pr_warning("configure channel-path failed "
785 "(cmd=0x%08x, response=0x%04x)\n", cmd,
786 sccb->header.response_code);
787 rc = -EIO;
788 break;
789 }
790out:
791 free_page((unsigned long) sccb);
792 return rc;
793}
794
795
796
797
798
799
800
801
802int sclp_chp_configure(struct chp_id chpid)
803{
804 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
805}
806
807
808
809
810
811
812
813
814int sclp_chp_deconfigure(struct chp_id chpid)
815{
816 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
817}
818
819struct chp_info_sccb {
820 struct sccb_header header;
821 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
822 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
823 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
824 u8 ccm;
825 u8 reserved[6];
826 u8 cssid;
827} __attribute__((packed));
828
829
830
831
832
833
834
835
836
837int sclp_chp_read_info(struct sclp_chp_info *info)
838{
839 struct chp_info_sccb *sccb;
840 int rc;
841
842 if (!SCLP_HAS_CHP_INFO)
843 return -EOPNOTSUPP;
844
845 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
846 if (!sccb)
847 return -ENOMEM;
848 sccb->header.length = sizeof(*sccb);
849 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
850 if (rc)
851 goto out;
852 if (sccb->header.response_code != 0x0010) {
853 pr_warning("read channel-path info failed "
854 "(response=0x%04x)\n", sccb->header.response_code);
855 rc = -EIO;
856 goto out;
857 }
858 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
859 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
860 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
861out:
862 free_page((unsigned long) sccb);
863 return rc;
864}
865
