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8
9#define KMSG_COMPONENT "sclp_cmd"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/completion.h>
13#include <linux/init.h>
14#include <linux/errno.h>
15#include <linux/err.h>
16#include <linux/export.h>
17#include <linux/slab.h>
18#include <linux/string.h>
19#include <linux/mm.h>
20#include <linux/mmzone.h>
21#include <linux/memory.h>
22#include <linux/module.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#include <asm/facility.h>
30
31#include "sclp.h"
32
33static void sclp_sync_callback(struct sclp_req *req, void *data)
34{
35 struct completion *completion = data;
36
37 complete(completion);
38}
39
40int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
41{
42 return sclp_sync_request_timeout(cmd, sccb, 0);
43}
44
45int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout)
46{
47 struct completion completion;
48 struct sclp_req *request;
49 int rc;
50
51 request = kzalloc(sizeof(*request), GFP_KERNEL);
52 if (!request)
53 return -ENOMEM;
54 if (timeout)
55 request->queue_timeout = timeout;
56 request->command = cmd;
57 request->sccb = sccb;
58 request->status = SCLP_REQ_FILLED;
59 request->callback = sclp_sync_callback;
60 request->callback_data = &completion;
61 init_completion(&completion);
62
63
64 rc = sclp_add_request(request);
65 if (rc)
66 goto out;
67 wait_for_completion(&completion);
68
69
70 if (request->status != SCLP_REQ_DONE) {
71 pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n",
72 cmd, request->status);
73 rc = -EIO;
74 }
75out:
76 kfree(request);
77 return rc;
78}
79
80
81
82
83
84#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
85#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
86
87int _sclp_get_core_info(struct sclp_core_info *info)
88{
89 int rc;
90 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
91 struct read_cpu_info_sccb *sccb;
92
93 if (!SCLP_HAS_CPU_INFO)
94 return -EOPNOTSUPP;
95
96 sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
97 if (!sccb)
98 return -ENOMEM;
99 sccb->header.length = length;
100 sccb->header.control_mask[2] = 0x80;
101 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
102 SCLP_QUEUE_INTERVAL);
103 if (rc)
104 goto out;
105 if (sccb->header.response_code != 0x0010) {
106 pr_warn("readcpuinfo failed (response=0x%04x)\n",
107 sccb->header.response_code);
108 rc = -EIO;
109 goto out;
110 }
111 sclp_fill_core_info(info, sccb);
112out:
113 free_pages((unsigned long) sccb, get_order(length));
114 return rc;
115}
116
117struct cpu_configure_sccb {
118 struct sccb_header header;
119} __attribute__((packed, aligned(8)));
120
121static int do_core_configure(sclp_cmdw_t cmd)
122{
123 struct cpu_configure_sccb *sccb;
124 int rc;
125
126 if (!SCLP_HAS_CPU_RECONFIG)
127 return -EOPNOTSUPP;
128
129
130
131
132 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
133 if (!sccb)
134 return -ENOMEM;
135 sccb->header.length = sizeof(*sccb);
136 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
137 if (rc)
138 goto out;
139 switch (sccb->header.response_code) {
140 case 0x0020:
141 case 0x0120:
142 break;
143 default:
144 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
145 cmd, sccb->header.response_code);
146 rc = -EIO;
147 break;
148 }
149out:
150 kfree(sccb);
151 return rc;
152}
153
154int sclp_core_configure(u8 core)
155{
156 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
157}
158
159int sclp_core_deconfigure(u8 core)
160{
161 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
162}
163
164#ifdef CONFIG_MEMORY_HOTPLUG
165
166static DEFINE_MUTEX(sclp_mem_mutex);
167static LIST_HEAD(sclp_mem_list);
168static u8 sclp_max_storage_id;
169static DECLARE_BITMAP(sclp_storage_ids, 256);
170
171struct memory_increment {
172 struct list_head list;
173 u16 rn;
174 int standby;
175};
176
177struct assign_storage_sccb {
178 struct sccb_header header;
179 u16 rn;
180} __packed;
181
182int arch_get_memory_phys_device(unsigned long start_pfn)
183{
184 if (!sclp.rzm)
185 return 0;
186 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
187}
188
189static unsigned long long rn2addr(u16 rn)
190{
191 return (unsigned long long) (rn - 1) * sclp.rzm;
192}
193
194static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
195{
196 struct assign_storage_sccb *sccb;
197 int rc;
198
199 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
200 if (!sccb)
201 return -ENOMEM;
202 sccb->header.length = PAGE_SIZE;
203 sccb->rn = rn;
204 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
205 if (rc)
206 goto out;
207 switch (sccb->header.response_code) {
208 case 0x0020:
209 case 0x0120:
210 break;
211 default:
212 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
213 cmd, sccb->header.response_code, rn);
214 rc = -EIO;
215 break;
216 }
217out:
218 free_page((unsigned long) sccb);
219 return rc;
220}
221
222static int sclp_assign_storage(u16 rn)
223{
224 unsigned long long start;
225 int rc;
226
227 rc = do_assign_storage(0x000d0001, rn);
228 if (rc)
229 return rc;
230 start = rn2addr(rn);
231 storage_key_init_range(start, start + sclp.rzm);
232 return 0;
233}
234
235static int sclp_unassign_storage(u16 rn)
236{
237 return do_assign_storage(0x000c0001, rn);
238}
239
240struct attach_storage_sccb {
241 struct sccb_header header;
242 u16 :16;
243 u16 assigned;
244 u32 :32;
245 u32 entries[0];
246} __packed;
247
248static int sclp_attach_storage(u8 id)
249{
250 struct attach_storage_sccb *sccb;
251 int rc;
252 int i;
253
254 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
255 if (!sccb)
256 return -ENOMEM;
257 sccb->header.length = PAGE_SIZE;
258 sccb->header.function_code = 0x40;
259 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
260 SCLP_QUEUE_INTERVAL);
261 if (rc)
262 goto out;
263 switch (sccb->header.response_code) {
264 case 0x0020:
265 set_bit(id, sclp_storage_ids);
266 for (i = 0; i < sccb->assigned; i++) {
267 if (sccb->entries[i])
268 sclp_unassign_storage(sccb->entries[i] >> 16);
269 }
270 break;
271 default:
272 rc = -EIO;
273 break;
274 }
275out:
276 free_page((unsigned long) sccb);
277 return rc;
278}
279
280static int sclp_mem_change_state(unsigned long start, unsigned long size,
281 int online)
282{
283 struct memory_increment *incr;
284 unsigned long long istart;
285 int rc = 0;
286
287 list_for_each_entry(incr, &sclp_mem_list, list) {
288 istart = rn2addr(incr->rn);
289 if (start + size - 1 < istart)
290 break;
291 if (start > istart + sclp.rzm - 1)
292 continue;
293 if (online)
294 rc |= sclp_assign_storage(incr->rn);
295 else
296 sclp_unassign_storage(incr->rn);
297 if (rc == 0)
298 incr->standby = online ? 0 : 1;
299 }
300 return rc ? -EIO : 0;
301}
302
303static bool contains_standby_increment(unsigned long start, unsigned long end)
304{
305 struct memory_increment *incr;
306 unsigned long istart;
307
308 list_for_each_entry(incr, &sclp_mem_list, list) {
309 istart = rn2addr(incr->rn);
310 if (end - 1 < istart)
311 continue;
312 if (start > istart + sclp.rzm - 1)
313 continue;
314 if (incr->standby)
315 return true;
316 }
317 return false;
318}
319
320static int sclp_mem_notifier(struct notifier_block *nb,
321 unsigned long action, void *data)
322{
323 unsigned long start, size;
324 struct memory_notify *arg;
325 unsigned char id;
326 int rc = 0;
327
328 arg = data;
329 start = arg->start_pfn << PAGE_SHIFT;
330 size = arg->nr_pages << PAGE_SHIFT;
331 mutex_lock(&sclp_mem_mutex);
332 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
333 sclp_attach_storage(id);
334 switch (action) {
335 case MEM_GOING_OFFLINE:
336
337
338
339
340
341 if (contains_standby_increment(start, start + size))
342 rc = -EPERM;
343 break;
344 case MEM_ONLINE:
345 case MEM_CANCEL_OFFLINE:
346 break;
347 case MEM_GOING_ONLINE:
348 rc = sclp_mem_change_state(start, size, 1);
349 break;
350 case MEM_CANCEL_ONLINE:
351 sclp_mem_change_state(start, size, 0);
352 break;
353 case MEM_OFFLINE:
354 sclp_mem_change_state(start, size, 0);
355 break;
356 default:
357 rc = -EINVAL;
358 break;
359 }
360 mutex_unlock(&sclp_mem_mutex);
361 return rc ? NOTIFY_BAD : NOTIFY_OK;
362}
363
364static struct notifier_block sclp_mem_nb = {
365 .notifier_call = sclp_mem_notifier,
366};
367
368static void __init align_to_block_size(unsigned long long *start,
369 unsigned long long *size,
370 unsigned long long alignment)
371{
372 unsigned long long start_align, size_align;
373
374 start_align = roundup(*start, alignment);
375 size_align = rounddown(*start + *size, alignment) - start_align;
376
377 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
378 *start, size_align >> 20, *size >> 20);
379 *start = start_align;
380 *size = size_align;
381}
382
383static void __init add_memory_merged(u16 rn)
384{
385 unsigned long long start, size, addr, block_size;
386 static u16 first_rn, num;
387
388 if (rn && first_rn && (first_rn + num == rn)) {
389 num++;
390 return;
391 }
392 if (!first_rn)
393 goto skip_add;
394 start = rn2addr(first_rn);
395 size = (unsigned long long) num * sclp.rzm;
396 if (start >= VMEM_MAX_PHYS)
397 goto skip_add;
398 if (start + size > VMEM_MAX_PHYS)
399 size = VMEM_MAX_PHYS - start;
400 if (start >= ident_map_size)
401 goto skip_add;
402 if (start + size > ident_map_size)
403 size = ident_map_size - start;
404 block_size = memory_block_size_bytes();
405 align_to_block_size(&start, &size, block_size);
406 if (!size)
407 goto skip_add;
408 for (addr = start; addr < start + size; addr += block_size)
409 add_memory(0, addr, block_size, MHP_NONE);
410skip_add:
411 first_rn = rn;
412 num = 1;
413}
414
415static void __init sclp_add_standby_memory(void)
416{
417 struct memory_increment *incr;
418
419 list_for_each_entry(incr, &sclp_mem_list, list)
420 if (incr->standby)
421 add_memory_merged(incr->rn);
422 add_memory_merged(0);
423}
424
425static void __init insert_increment(u16 rn, int standby, int assigned)
426{
427 struct memory_increment *incr, *new_incr;
428 struct list_head *prev;
429 u16 last_rn;
430
431 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
432 if (!new_incr)
433 return;
434 new_incr->rn = rn;
435 new_incr->standby = standby;
436 last_rn = 0;
437 prev = &sclp_mem_list;
438 list_for_each_entry(incr, &sclp_mem_list, list) {
439 if (assigned && incr->rn > rn)
440 break;
441 if (!assigned && incr->rn - last_rn > 1)
442 break;
443 last_rn = incr->rn;
444 prev = &incr->list;
445 }
446 if (!assigned)
447 new_incr->rn = last_rn + 1;
448 if (new_incr->rn > sclp.rnmax) {
449 kfree(new_incr);
450 return;
451 }
452 list_add(&new_incr->list, prev);
453}
454
455static int __init sclp_detect_standby_memory(void)
456{
457 struct read_storage_sccb *sccb;
458 int i, id, assigned, rc;
459
460 if (OLDMEM_BASE)
461 return 0;
462 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
463 return 0;
464 rc = -ENOMEM;
465 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
466 if (!sccb)
467 goto out;
468 assigned = 0;
469 for (id = 0; id <= sclp_max_storage_id; id++) {
470 memset(sccb, 0, PAGE_SIZE);
471 sccb->header.length = PAGE_SIZE;
472 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
473 if (rc)
474 goto out;
475 switch (sccb->header.response_code) {
476 case 0x0010:
477 set_bit(id, sclp_storage_ids);
478 for (i = 0; i < sccb->assigned; i++) {
479 if (!sccb->entries[i])
480 continue;
481 assigned++;
482 insert_increment(sccb->entries[i] >> 16, 0, 1);
483 }
484 break;
485 case 0x0310:
486 break;
487 case 0x0410:
488 for (i = 0; i < sccb->assigned; i++) {
489 if (!sccb->entries[i])
490 continue;
491 assigned++;
492 insert_increment(sccb->entries[i] >> 16, 1, 1);
493 }
494 break;
495 default:
496 rc = -EIO;
497 break;
498 }
499 if (!rc)
500 sclp_max_storage_id = sccb->max_id;
501 }
502 if (rc || list_empty(&sclp_mem_list))
503 goto out;
504 for (i = 1; i <= sclp.rnmax - assigned; i++)
505 insert_increment(0, 1, 0);
506 rc = register_memory_notifier(&sclp_mem_nb);
507 if (rc)
508 goto out;
509 sclp_add_standby_memory();
510out:
511 free_page((unsigned long) sccb);
512 return rc;
513}
514__initcall(sclp_detect_standby_memory);
515
516#endif
517
518
519
520
521
522#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
523#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
524#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
525
526struct chp_cfg_sccb {
527 struct sccb_header header;
528 u8 ccm;
529 u8 reserved[6];
530 u8 cssid;
531} __attribute__((packed));
532
533static int do_chp_configure(sclp_cmdw_t cmd)
534{
535 struct chp_cfg_sccb *sccb;
536 int rc;
537
538 if (!SCLP_HAS_CHP_RECONFIG)
539 return -EOPNOTSUPP;
540
541 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
542 if (!sccb)
543 return -ENOMEM;
544 sccb->header.length = sizeof(*sccb);
545 rc = sclp_sync_request(cmd, sccb);
546 if (rc)
547 goto out;
548 switch (sccb->header.response_code) {
549 case 0x0020:
550 case 0x0120:
551 case 0x0440:
552 case 0x0450:
553 break;
554 default:
555 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
556 cmd, sccb->header.response_code);
557 rc = -EIO;
558 break;
559 }
560out:
561 free_page((unsigned long) sccb);
562 return rc;
563}
564
565
566
567
568
569
570
571
572int sclp_chp_configure(struct chp_id chpid)
573{
574 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
575}
576
577
578
579
580
581
582
583
584int sclp_chp_deconfigure(struct chp_id chpid)
585{
586 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
587}
588
589struct chp_info_sccb {
590 struct sccb_header header;
591 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
592 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
593 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
594 u8 ccm;
595 u8 reserved[6];
596 u8 cssid;
597} __attribute__((packed));
598
599
600
601
602
603
604
605
606
607int sclp_chp_read_info(struct sclp_chp_info *info)
608{
609 struct chp_info_sccb *sccb;
610 int rc;
611
612 if (!SCLP_HAS_CHP_INFO)
613 return -EOPNOTSUPP;
614
615 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
616 if (!sccb)
617 return -ENOMEM;
618 sccb->header.length = sizeof(*sccb);
619 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
620 if (rc)
621 goto out;
622 if (sccb->header.response_code != 0x0010) {
623 pr_warn("read channel-path info failed (response=0x%04x)\n",
624 sccb->header.response_code);
625 rc = -EIO;
626 goto out;
627 }
628 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
629 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
630 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
631out:
632 free_page((unsigned long) sccb);
633 return rc;
634}
635
