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