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#include <asm/numa.h>
29
30#include "sclp.h"
31
32static void sclp_sync_callback(struct sclp_req *req, void *data)
33{
34 struct completion *completion = data;
35
36 complete(completion);
37}
38
39int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
40{
41 return sclp_sync_request_timeout(cmd, sccb, 0);
42}
43
44int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
45{
46 struct completion completion;
47 struct sclp_req *request;
48 int rc;
49
50 request = kzalloc(sizeof(*request), GFP_KERNEL);
51 if (!request)
52 return -ENOMEM;
53 if (timeout)
54 request->queue_timeout = timeout;
55 request->command = cmd;
56 request->sccb = sccb;
57 request->status = SCLP_REQ_FILLED;
58 request->callback = sclp_sync_callback;
59 request->callback_data = &completion;
60 init_completion(&completion);
61
62
63 rc = sclp_add_request(request);
64 if (rc)
65 goto out;
66 wait_for_completion(&completion);
67
68
69 if (request->status != SCLP_REQ_DONE) {
70 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
71 cmd, request->status);
72 rc = -EIO;
73 }
74out:
75 kfree(request);
76 return rc;
77}
78
79
80
81
82
83#define SCLP_CMDW_READ_CPU_INFO 0x00010001
84#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
85#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
86
87struct read_cpu_info_sccb {
88 struct sccb_header header;
89 u16 nr_configured;
90 u16 offset_configured;
91 u16 nr_standby;
92 u16 offset_standby;
93 u8 reserved[4096 - 16];
94} __attribute__((packed, aligned(PAGE_SIZE)));
95
96static void sclp_fill_core_info(struct sclp_core_info *info,
97 struct read_cpu_info_sccb *sccb)
98{
99 char *page = (char *) sccb;
100
101 memset(info, 0, sizeof(*info));
102 info->configured = sccb->nr_configured;
103 info->standby = sccb->nr_standby;
104 info->combined = sccb->nr_configured + sccb->nr_standby;
105 memcpy(&info->core, page + sccb->offset_configured,
106 info->combined * sizeof(struct sclp_core_entry));
107}
108
109int sclp_get_core_info(struct sclp_core_info *info)
110{
111 int rc;
112 struct read_cpu_info_sccb *sccb;
113
114 if (!SCLP_HAS_CPU_INFO)
115 return -EOPNOTSUPP;
116 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
117 if (!sccb)
118 return -ENOMEM;
119 sccb->header.length = sizeof(*sccb);
120 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
121 SCLP_QUEUE_INTERVAL);
122 if (rc)
123 goto out;
124 if (sccb->header.response_code != 0x0010) {
125 pr_warn("readcpuinfo failed (response=0x%04x)\n",
126 sccb->header.response_code);
127 rc = -EIO;
128 goto out;
129 }
130 sclp_fill_core_info(info, sccb);
131out:
132 free_page((unsigned long) sccb);
133 return rc;
134}
135
136struct cpu_configure_sccb {
137 struct sccb_header header;
138} __attribute__((packed, aligned(8)));
139
140static int do_core_configure(sclp_cmdw_t cmd)
141{
142 struct cpu_configure_sccb *sccb;
143 int rc;
144
145 if (!SCLP_HAS_CPU_RECONFIG)
146 return -EOPNOTSUPP;
147
148
149
150
151 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
152 if (!sccb)
153 return -ENOMEM;
154 sccb->header.length = sizeof(*sccb);
155 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
156 if (rc)
157 goto out;
158 switch (sccb->header.response_code) {
159 case 0x0020:
160 case 0x0120:
161 break;
162 default:
163 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
164 cmd, 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_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
233 cmd, sccb->header.response_code, rn);
234 rc = -EIO;
235 break;
236 }
237out:
238 free_page((unsigned long) sccb);
239 return rc;
240}
241
242static int sclp_assign_storage(u16 rn)
243{
244 unsigned long long start;
245 int rc;
246
247 rc = do_assign_storage(0x000d0001, rn);
248 if (rc)
249 return rc;
250 start = rn2addr(rn);
251 storage_key_init_range(start, start + sclp.rzm);
252 return 0;
253}
254
255static int sclp_unassign_storage(u16 rn)
256{
257 return do_assign_storage(0x000c0001, rn);
258}
259
260struct attach_storage_sccb {
261 struct sccb_header header;
262 u16 :16;
263 u16 assigned;
264 u32 :32;
265 u32 entries[0];
266} __packed;
267
268static int sclp_attach_storage(u8 id)
269{
270 struct attach_storage_sccb *sccb;
271 int rc;
272 int i;
273
274 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
275 if (!sccb)
276 return -ENOMEM;
277 sccb->header.length = PAGE_SIZE;
278 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
279 SCLP_QUEUE_INTERVAL);
280 if (rc)
281 goto out;
282 switch (sccb->header.response_code) {
283 case 0x0020:
284 set_bit(id, sclp_storage_ids);
285 for (i = 0; i < sccb->assigned; i++) {
286 if (sccb->entries[i])
287 sclp_unassign_storage(sccb->entries[i] >> 16);
288 }
289 break;
290 default:
291 rc = -EIO;
292 break;
293 }
294out:
295 free_page((unsigned long) sccb);
296 return rc;
297}
298
299static int sclp_mem_change_state(unsigned long start, unsigned long size,
300 int online)
301{
302 struct memory_increment *incr;
303 unsigned long long istart;
304 int rc = 0;
305
306 list_for_each_entry(incr, &sclp_mem_list, list) {
307 istart = rn2addr(incr->rn);
308 if (start + size - 1 < istart)
309 break;
310 if (start > istart + sclp.rzm - 1)
311 continue;
312 if (online)
313 rc |= sclp_assign_storage(incr->rn);
314 else
315 sclp_unassign_storage(incr->rn);
316 if (rc == 0)
317 incr->standby = online ? 0 : 1;
318 }
319 return rc ? -EIO : 0;
320}
321
322static bool contains_standby_increment(unsigned long start, unsigned long end)
323{
324 struct memory_increment *incr;
325 unsigned long istart;
326
327 list_for_each_entry(incr, &sclp_mem_list, list) {
328 istart = rn2addr(incr->rn);
329 if (end - 1 < istart)
330 continue;
331 if (start > istart + sclp.rzm - 1)
332 continue;
333 if (incr->standby)
334 return true;
335 }
336 return false;
337}
338
339static int sclp_mem_notifier(struct notifier_block *nb,
340 unsigned long action, void *data)
341{
342 unsigned long start, size;
343 struct memory_notify *arg;
344 unsigned char id;
345 int rc = 0;
346
347 arg = data;
348 start = arg->start_pfn << PAGE_SHIFT;
349 size = arg->nr_pages << PAGE_SHIFT;
350 mutex_lock(&sclp_mem_mutex);
351 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
352 sclp_attach_storage(id);
353 switch (action) {
354 case MEM_GOING_OFFLINE:
355
356
357
358
359
360 if (contains_standby_increment(start, start + size))
361 rc = -EPERM;
362 break;
363 case MEM_ONLINE:
364 case MEM_CANCEL_OFFLINE:
365 break;
366 case MEM_GOING_ONLINE:
367 rc = sclp_mem_change_state(start, size, 1);
368 break;
369 case MEM_CANCEL_ONLINE:
370 sclp_mem_change_state(start, size, 0);
371 break;
372 case MEM_OFFLINE:
373 sclp_mem_change_state(start, size, 0);
374 break;
375 default:
376 rc = -EINVAL;
377 break;
378 }
379 if (!rc)
380 sclp_mem_state_changed = 1;
381 mutex_unlock(&sclp_mem_mutex);
382 return rc ? NOTIFY_BAD : NOTIFY_OK;
383}
384
385static struct notifier_block sclp_mem_nb = {
386 .notifier_call = sclp_mem_notifier,
387};
388
389static void __init align_to_block_size(unsigned long long *start,
390 unsigned long long *size,
391 unsigned long long alignment)
392{
393 unsigned long long start_align, size_align;
394
395 start_align = roundup(*start, alignment);
396 size_align = rounddown(*start + *size, alignment) - start_align;
397
398 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
399 *start, size_align >> 20, *size >> 20);
400 *start = start_align;
401 *size = size_align;
402}
403
404static void __init add_memory_merged(u16 rn)
405{
406 unsigned long long start, size, addr, block_size;
407 static u16 first_rn, num;
408
409 if (rn && first_rn && (first_rn + num == rn)) {
410 num++;
411 return;
412 }
413 if (!first_rn)
414 goto skip_add;
415 start = rn2addr(first_rn);
416 size = (unsigned long long) num * sclp.rzm;
417 if (start >= VMEM_MAX_PHYS)
418 goto skip_add;
419 if (start + size > VMEM_MAX_PHYS)
420 size = VMEM_MAX_PHYS - start;
421 if (memory_end_set && (start >= memory_end))
422 goto skip_add;
423 if (memory_end_set && (start + size > memory_end))
424 size = memory_end - start;
425 block_size = memory_block_size_bytes();
426 align_to_block_size(&start, &size, block_size);
427 if (!size)
428 goto skip_add;
429 for (addr = start; addr < start + size; addr += block_size)
430 add_memory(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
431skip_add:
432 first_rn = rn;
433 num = 1;
434}
435
436static void __init sclp_add_standby_memory(void)
437{
438 struct memory_increment *incr;
439
440 list_for_each_entry(incr, &sclp_mem_list, list)
441 if (incr->standby)
442 add_memory_merged(incr->rn);
443 add_memory_merged(0);
444}
445
446static void __init insert_increment(u16 rn, int standby, int assigned)
447{
448 struct memory_increment *incr, *new_incr;
449 struct list_head *prev;
450 u16 last_rn;
451
452 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
453 if (!new_incr)
454 return;
455 new_incr->rn = rn;
456 new_incr->standby = standby;
457 last_rn = 0;
458 prev = &sclp_mem_list;
459 list_for_each_entry(incr, &sclp_mem_list, list) {
460 if (assigned && incr->rn > rn)
461 break;
462 if (!assigned && incr->rn - last_rn > 1)
463 break;
464 last_rn = incr->rn;
465 prev = &incr->list;
466 }
467 if (!assigned)
468 new_incr->rn = last_rn + 1;
469 if (new_incr->rn > sclp.rnmax) {
470 kfree(new_incr);
471 return;
472 }
473 list_add(&new_incr->list, prev);
474}
475
476static int sclp_mem_freeze(struct device *dev)
477{
478 if (!sclp_mem_state_changed)
479 return 0;
480 pr_err("Memory hotplug state changed, suspend refused.\n");
481 return -EPERM;
482}
483
484struct read_storage_sccb {
485 struct sccb_header header;
486 u16 max_id;
487 u16 assigned;
488 u16 standby;
489 u16 :16;
490 u32 entries[0];
491} __packed;
492
493static const struct dev_pm_ops sclp_mem_pm_ops = {
494 .freeze = sclp_mem_freeze,
495};
496
497static struct platform_driver sclp_mem_pdrv = {
498 .driver = {
499 .name = "sclp_mem",
500 .pm = &sclp_mem_pm_ops,
501 },
502};
503
504static int __init sclp_detect_standby_memory(void)
505{
506 struct platform_device *sclp_pdev;
507 struct read_storage_sccb *sccb;
508 int i, id, assigned, rc;
509
510 if (OLDMEM_BASE)
511 return 0;
512 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
513 return 0;
514 rc = -ENOMEM;
515 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
516 if (!sccb)
517 goto out;
518 assigned = 0;
519 for (id = 0; id <= sclp_max_storage_id; id++) {
520 memset(sccb, 0, PAGE_SIZE);
521 sccb->header.length = PAGE_SIZE;
522 rc = sclp_sync_request(0x00040001 | id << 8, sccb);
523 if (rc)
524 goto out;
525 switch (sccb->header.response_code) {
526 case 0x0010:
527 set_bit(id, sclp_storage_ids);
528 for (i = 0; i < sccb->assigned; i++) {
529 if (!sccb->entries[i])
530 continue;
531 assigned++;
532 insert_increment(sccb->entries[i] >> 16, 0, 1);
533 }
534 break;
535 case 0x0310:
536 break;
537 case 0x0410:
538 for (i = 0; i < sccb->assigned; i++) {
539 if (!sccb->entries[i])
540 continue;
541 assigned++;
542 insert_increment(sccb->entries[i] >> 16, 1, 1);
543 }
544 break;
545 default:
546 rc = -EIO;
547 break;
548 }
549 if (!rc)
550 sclp_max_storage_id = sccb->max_id;
551 }
552 if (rc || list_empty(&sclp_mem_list))
553 goto out;
554 for (i = 1; i <= sclp.rnmax - assigned; i++)
555 insert_increment(0, 1, 0);
556 rc = register_memory_notifier(&sclp_mem_nb);
557 if (rc)
558 goto out;
559 rc = platform_driver_register(&sclp_mem_pdrv);
560 if (rc)
561 goto out;
562 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
563 rc = PTR_ERR_OR_ZERO(sclp_pdev);
564 if (rc)
565 goto out_driver;
566 sclp_add_standby_memory();
567 goto out;
568out_driver:
569 platform_driver_unregister(&sclp_mem_pdrv);
570out:
571 free_page((unsigned long) sccb);
572 return rc;
573}
574__initcall(sclp_detect_standby_memory);
575
576#endif
577
578
579
580
581#define SCLP_CMDW_CONFIGURE_PCI 0x001a0001
582#define SCLP_CMDW_DECONFIGURE_PCI 0x001b0001
583
584#define SCLP_RECONFIG_PCI_ATPYE 2
585
586struct pci_cfg_sccb {
587 struct sccb_header header;
588 u8 atype;
589 u8 reserved1;
590 u16 reserved2;
591 u32 aid;
592} __packed;
593
594static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
595{
596 struct pci_cfg_sccb *sccb;
597 int rc;
598
599 if (!SCLP_HAS_PCI_RECONFIG)
600 return -EOPNOTSUPP;
601
602 sccb = (struct pci_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
603 if (!sccb)
604 return -ENOMEM;
605
606 sccb->header.length = PAGE_SIZE;
607 sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
608 sccb->aid = fid;
609 rc = sclp_sync_request(cmd, sccb);
610 if (rc)
611 goto out;
612 switch (sccb->header.response_code) {
613 case 0x0020:
614 case 0x0120:
615 break;
616 default:
617 pr_warn("configure PCI I/O adapter failed: cmd=0x%08x response=0x%04x\n",
618 cmd, sccb->header.response_code);
619 rc = -EIO;
620 break;
621 }
622out:
623 free_page((unsigned long) sccb);
624 return rc;
625}
626
627int sclp_pci_configure(u32 fid)
628{
629 return do_pci_configure(SCLP_CMDW_CONFIGURE_PCI, fid);
630}
631EXPORT_SYMBOL(sclp_pci_configure);
632
633int sclp_pci_deconfigure(u32 fid)
634{
635 return do_pci_configure(SCLP_CMDW_DECONFIGURE_PCI, fid);
636}
637EXPORT_SYMBOL(sclp_pci_deconfigure);
638
639
640
641
642
643#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
644#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
645#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
646
647struct chp_cfg_sccb {
648 struct sccb_header header;
649 u8 ccm;
650 u8 reserved[6];
651 u8 cssid;
652} __attribute__((packed));
653
654static int do_chp_configure(sclp_cmdw_t cmd)
655{
656 struct chp_cfg_sccb *sccb;
657 int rc;
658
659 if (!SCLP_HAS_CHP_RECONFIG)
660 return -EOPNOTSUPP;
661
662 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
663 if (!sccb)
664 return -ENOMEM;
665 sccb->header.length = sizeof(*sccb);
666 rc = sclp_sync_request(cmd, sccb);
667 if (rc)
668 goto out;
669 switch (sccb->header.response_code) {
670 case 0x0020:
671 case 0x0120:
672 case 0x0440:
673 case 0x0450:
674 break;
675 default:
676 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
677 cmd, sccb->header.response_code);
678 rc = -EIO;
679 break;
680 }
681out:
682 free_page((unsigned long) sccb);
683 return rc;
684}
685
686
687
688
689
690
691
692
693int sclp_chp_configure(struct chp_id chpid)
694{
695 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
696}
697
698
699
700
701
702
703
704
705int sclp_chp_deconfigure(struct chp_id chpid)
706{
707 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
708}
709
710struct chp_info_sccb {
711 struct sccb_header header;
712 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
713 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
714 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
715 u8 ccm;
716 u8 reserved[6];
717 u8 cssid;
718} __attribute__((packed));
719
720
721
722
723
724
725
726
727
728int sclp_chp_read_info(struct sclp_chp_info *info)
729{
730 struct chp_info_sccb *sccb;
731 int rc;
732
733 if (!SCLP_HAS_CHP_INFO)
734 return -EOPNOTSUPP;
735
736 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
737 if (!sccb)
738 return -ENOMEM;
739 sccb->header.length = sizeof(*sccb);
740 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
741 if (rc)
742 goto out;
743 if (sccb->header.response_code != 0x0010) {
744 pr_warn("read channel-path info failed (response=0x%04x)\n",
745 sccb->header.response_code);
746 rc = -EIO;
747 goto out;
748 }
749 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
750 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
751 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
752out:
753 free_page((unsigned long) sccb);
754 return rc;
755}
756
