1
2
3
4
5
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/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
198static int do_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 = do_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 = do_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 int usecount;
349};
350
351struct assign_storage_sccb {
352 struct sccb_header header;
353 u16 rn;
354} __packed;
355
356int arch_get_memory_phys_device(unsigned long start_pfn)
357{
358 if (!rzm)
359 return 0;
360 return PFN_PHYS(start_pfn) >> ilog2(rzm);
361}
362
363static unsigned long long rn2addr(u16 rn)
364{
365 return (unsigned long long) (rn - 1) * rzm;
366}
367
368static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
369{
370 struct assign_storage_sccb *sccb;
371 int rc;
372
373 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
374 if (!sccb)
375 return -ENOMEM;
376 sccb->header.length = PAGE_SIZE;
377 sccb->rn = rn;
378 rc = do_sync_request(cmd, sccb);
379 if (rc)
380 goto out;
381 switch (sccb->header.response_code) {
382 case 0x0020:
383 case 0x0120:
384 break;
385 default:
386 pr_warning("assign storage failed (cmd=0x%08x, "
387 "response=0x%04x, rn=0x%04x)\n", cmd,
388 sccb->header.response_code, rn);
389 rc = -EIO;
390 break;
391 }
392out:
393 free_page((unsigned long) sccb);
394 return rc;
395}
396
397static int sclp_assign_storage(u16 rn)
398{
399 unsigned long long start;
400 int rc;
401
402 rc = do_assign_storage(0x000d0001, rn);
403 if (rc)
404 return rc;
405 start = rn2addr(rn);
406 storage_key_init_range(start, start + rzm);
407 return 0;
408}
409
410static int sclp_unassign_storage(u16 rn)
411{
412 return do_assign_storage(0x000c0001, rn);
413}
414
415struct attach_storage_sccb {
416 struct sccb_header header;
417 u16 :16;
418 u16 assigned;
419 u32 :32;
420 u32 entries[0];
421} __packed;
422
423static int sclp_attach_storage(u8 id)
424{
425 struct attach_storage_sccb *sccb;
426 int rc;
427 int i;
428
429 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
430 if (!sccb)
431 return -ENOMEM;
432 sccb->header.length = PAGE_SIZE;
433 rc = do_sync_request(0x00080001 | id << 8, sccb);
434 if (rc)
435 goto out;
436 switch (sccb->header.response_code) {
437 case 0x0020:
438 set_bit(id, sclp_storage_ids);
439 for (i = 0; i < sccb->assigned; i++) {
440 if (sccb->entries[i])
441 sclp_unassign_storage(sccb->entries[i] >> 16);
442 }
443 break;
444 default:
445 rc = -EIO;
446 break;
447 }
448out:
449 free_page((unsigned long) sccb);
450 return rc;
451}
452
453static int sclp_mem_change_state(unsigned long start, unsigned long size,
454 int online)
455{
456 struct memory_increment *incr;
457 unsigned long long istart;
458 int rc = 0;
459
460 list_for_each_entry(incr, &sclp_mem_list, list) {
461 istart = rn2addr(incr->rn);
462 if (start + size - 1 < istart)
463 break;
464 if (start > istart + rzm - 1)
465 continue;
466 if (online) {
467 if (incr->usecount++)
468 continue;
469
470
471
472
473
474
475 rc |= sclp_assign_storage(incr->rn);
476 } else {
477 if (--incr->usecount)
478 continue;
479 sclp_unassign_storage(incr->rn);
480 }
481 }
482 return rc ? -EIO : 0;
483}
484
485static int sclp_mem_notifier(struct notifier_block *nb,
486 unsigned long action, void *data)
487{
488 unsigned long start, size;
489 struct memory_notify *arg;
490 unsigned char id;
491 int rc = 0;
492
493 arg = data;
494 start = arg->start_pfn << PAGE_SHIFT;
495 size = arg->nr_pages << PAGE_SHIFT;
496 mutex_lock(&sclp_mem_mutex);
497 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
498 sclp_attach_storage(id);
499 switch (action) {
500 case MEM_ONLINE:
501 case MEM_GOING_OFFLINE:
502 case MEM_CANCEL_OFFLINE:
503 break;
504 case MEM_GOING_ONLINE:
505 rc = sclp_mem_change_state(start, size, 1);
506 break;
507 case MEM_CANCEL_ONLINE:
508 sclp_mem_change_state(start, size, 0);
509 break;
510 case MEM_OFFLINE:
511 sclp_mem_change_state(start, size, 0);
512 break;
513 default:
514 rc = -EINVAL;
515 break;
516 }
517 if (!rc)
518 sclp_mem_state_changed = 1;
519 mutex_unlock(&sclp_mem_mutex);
520 return rc ? NOTIFY_BAD : NOTIFY_OK;
521}
522
523static struct notifier_block sclp_mem_nb = {
524 .notifier_call = sclp_mem_notifier,
525};
526
527static void __init add_memory_merged(u16 rn)
528{
529 static u16 first_rn, num;
530 unsigned long long start, size;
531
532 if (rn && first_rn && (first_rn + num == rn)) {
533 num++;
534 return;
535 }
536 if (!first_rn)
537 goto skip_add;
538 start = rn2addr(first_rn);
539 size = (unsigned long long ) num * rzm;
540 if (start >= VMEM_MAX_PHYS)
541 goto skip_add;
542 if (start + size > VMEM_MAX_PHYS)
543 size = VMEM_MAX_PHYS - start;
544 if (memory_end_set && (start >= memory_end))
545 goto skip_add;
546 if (memory_end_set && (start + size > memory_end))
547 size = memory_end - start;
548 add_memory(0, start, size);
549skip_add:
550 first_rn = rn;
551 num = 1;
552}
553
554static void __init sclp_add_standby_memory(void)
555{
556 struct memory_increment *incr;
557
558 list_for_each_entry(incr, &sclp_mem_list, list)
559 if (incr->standby)
560 add_memory_merged(incr->rn);
561 add_memory_merged(0);
562}
563
564static void __init insert_increment(u16 rn, int standby, int assigned)
565{
566 struct memory_increment *incr, *new_incr;
567 struct list_head *prev;
568 u16 last_rn;
569
570 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
571 if (!new_incr)
572 return;
573 new_incr->rn = rn;
574 new_incr->standby = standby;
575 if (!standby)
576 new_incr->usecount = 1;
577 last_rn = 0;
578 prev = &sclp_mem_list;
579 list_for_each_entry(incr, &sclp_mem_list, list) {
580 if (assigned && incr->rn > rn)
581 break;
582 if (!assigned && incr->rn - last_rn > 1)
583 break;
584 last_rn = incr->rn;
585 prev = &incr->list;
586 }
587 if (!assigned)
588 new_incr->rn = last_rn + 1;
589 if (new_incr->rn > rnmax) {
590 kfree(new_incr);
591 return;
592 }
593 list_add(&new_incr->list, prev);
594}
595
596static int sclp_mem_freeze(struct device *dev)
597{
598 if (!sclp_mem_state_changed)
599 return 0;
600 pr_err("Memory hotplug state changed, suspend refused.\n");
601 return -EPERM;
602}
603
604struct read_storage_sccb {
605 struct sccb_header header;
606 u16 max_id;
607 u16 assigned;
608 u16 standby;
609 u16 :16;
610 u32 entries[0];
611} __packed;
612
613static const struct dev_pm_ops sclp_mem_pm_ops = {
614 .freeze = sclp_mem_freeze,
615};
616
617static struct platform_driver sclp_mem_pdrv = {
618 .driver = {
619 .name = "sclp_mem",
620 .pm = &sclp_mem_pm_ops,
621 },
622};
623
624static int __init sclp_detect_standby_memory(void)
625{
626 struct platform_device *sclp_pdev;
627 struct read_storage_sccb *sccb;
628 int i, id, assigned, rc;
629
630 if (OLDMEM_BASE)
631 return 0;
632 if (!early_read_info_sccb_valid)
633 return 0;
634 if ((sclp_facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
635 return 0;
636 rc = -ENOMEM;
637 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
638 if (!sccb)
639 goto out;
640 assigned = 0;
641 for (id = 0; id <= sclp_max_storage_id; id++) {
642 memset(sccb, 0, PAGE_SIZE);
643 sccb->header.length = PAGE_SIZE;
644 rc = do_sync_request(0x00040001 | id << 8, sccb);
645 if (rc)
646 goto out;
647 switch (sccb->header.response_code) {
648 case 0x0010:
649 set_bit(id, sclp_storage_ids);
650 for (i = 0; i < sccb->assigned; i++) {
651 if (!sccb->entries[i])
652 continue;
653 assigned++;
654 insert_increment(sccb->entries[i] >> 16, 0, 1);
655 }
656 break;
657 case 0x0310:
658 break;
659 case 0x0410:
660 for (i = 0; i < sccb->assigned; i++) {
661 if (!sccb->entries[i])
662 continue;
663 assigned++;
664 insert_increment(sccb->entries[i] >> 16, 1, 1);
665 }
666 break;
667 default:
668 rc = -EIO;
669 break;
670 }
671 if (!rc)
672 sclp_max_storage_id = sccb->max_id;
673 }
674 if (rc || list_empty(&sclp_mem_list))
675 goto out;
676 for (i = 1; i <= rnmax - assigned; i++)
677 insert_increment(0, 1, 0);
678 rc = register_memory_notifier(&sclp_mem_nb);
679 if (rc)
680 goto out;
681 rc = platform_driver_register(&sclp_mem_pdrv);
682 if (rc)
683 goto out;
684 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
685 rc = IS_ERR(sclp_pdev) ? PTR_ERR(sclp_pdev) : 0;
686 if (rc)
687 goto out_driver;
688 sclp_add_standby_memory();
689 goto out;
690out_driver:
691 platform_driver_unregister(&sclp_mem_pdrv);
692out:
693 free_page((unsigned long) sccb);
694 return rc;
695}
696__initcall(sclp_detect_standby_memory);
697
698#endif
699
700
701
702
703#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
704#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
705
706#define SCLP_RECONFIG_PCI_ATPYE 2
707
708struct pci_cfg_sccb {
709 struct sccb_header header;
710 u8 atype;
711 u8 reserved1;
712 u16 reserved2;
713 u32 aid;
714} __packed;
715
716static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
717{
718 struct pci_cfg_sccb *sccb;
719 int rc;
720
721 if (!SCLP_HAS_PCI_RECONFIG)
722 return -EOPNOTSUPP;
723
724 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
725 if (!sccb)
726 return -ENOMEM;
727
728 sccb->header.length = PAGE_SIZE;
729 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
730 sccb->aid = fid;
731 rc = do_sync_request(cmd, sccb);
732 if (rc)
733 goto out;
734 switch (sccb->header.response_code) {
735 case 0x0020:
736 case 0x0120:
737 break;
738 default:
739 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
740 cmd, sccb->header.response_code);
741 rc = -EIO;
742 break;
743 }
744out:
745 free_page((unsigned long) sccb);
746 return rc;
747}
748
749int sclp_pci_configure(u32 fid)
750{
751 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
752}
753EXPORT_SYMBOL(sclp_pci_configure);
754
755int sclp_pci_deconfigure(u32 fid)
756{
757 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
758}
759EXPORT_SYMBOL(sclp_pci_deconfigure);
760
761
762
763
764
765#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
766#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
767#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
768
769struct chp_cfg_sccb {
770 struct sccb_header header;
771 u8 ccm;
772 u8 reserved[6];
773 u8 cssid;
774} __attribute__((packed));
775
776static int do_chp_configure(sclp_cmdw_t cmd)
777{
778 struct chp_cfg_sccb *sccb;
779 int rc;
780
781 if (!SCLP_HAS_CHP_RECONFIG)
782 return -EOPNOTSUPP;
783
784 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
785 if (!sccb)
786 return -ENOMEM;
787 sccb->header.length = sizeof(*sccb);
788 rc = do_sync_request(cmd, sccb);
789 if (rc)
790 goto out;
791 switch (sccb->header.response_code) {
792 case 0x0020:
793 case 0x0120:
794 case 0x0440:
795 case 0x0450:
796 break;
797 default:
798 pr_warning("configure channel-path failed "
799 "(cmd=0x%08x, response=0x%04x)\n", cmd,
800 sccb->header.response_code);
801 rc = -EIO;
802 break;
803 }
804out:
805 free_page((unsigned long) sccb);
806 return rc;
807}
808
809
810
811
812
813
814
815
816int sclp_chp_configure(struct chp_id chpid)
817{
818 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
819}
820
821
822
823
824
825
826
827
828int sclp_chp_deconfigure(struct chp_id chpid)
829{
830 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
831}
832
833struct chp_info_sccb {
834 struct sccb_header header;
835 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
836 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
837 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
838 u8 ccm;
839 u8 reserved[6];
840 u8 cssid;
841} __attribute__((packed));
842
843
844
845
846
847
848
849
850
851int sclp_chp_read_info(struct sclp_chp_info *info)
852{
853 struct chp_info_sccb *sccb;
854 int rc;
855
856 if (!SCLP_HAS_CHP_INFO)
857 return -EOPNOTSUPP;
858
859 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
860 if (!sccb)
861 return -ENOMEM;
862 sccb->header.length = sizeof(*sccb);
863 rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
864 if (rc)
865 goto out;
866 if (sccb->header.response_code != 0x0010) {
867 pr_warning("read channel-path info failed "
868 "(response=0x%04x)\n", sccb->header.response_code);
869 rc = -EIO;
870 goto out;
871 }
872 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
873 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
874 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
875out:
876 free_page((unsigned long) sccb);
877 return rc;
878}
879
