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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007,2012
4 *
5 * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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 <asm/ctlreg.h>
23#include <asm/chpid.h>
24#include <asm/setup.h>
25#include <asm/page.h>
26#include <asm/sclp.h>
27#include <asm/numa.h>
28#include <asm/facility.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 /* Perform sclp request. */
63 rc = sclp_add_request(request);
64 if (rc)
65 goto out;
66 wait_for_completion(&completion);
67
68 /* Check response. */
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 * CPU configuration related functions.
81 */
82
83#define SCLP_CMDW_CONFIGURE_CPU 0x00110001
84#define SCLP_CMDW_DECONFIGURE_CPU 0x00100001
85
86int _sclp_get_core_info(struct sclp_core_info *info)
87{
88 int rc;
89 int length = test_facility(140) ? EXT_SCCB_READ_CPU : PAGE_SIZE;
90 struct read_cpu_info_sccb *sccb;
91
92 if (!SCLP_HAS_CPU_INFO)
93 return -EOPNOTSUPP;
94
95 sccb = (void *)__get_free_pages(GFP_KERNEL | GFP_DMA | __GFP_ZERO, get_order(length));
96 if (!sccb)
97 return -ENOMEM;
98 sccb->header.length = length;
99 sccb->header.control_mask[2] = 0x80;
100 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
101 SCLP_QUEUE_INTERVAL);
102 if (rc)
103 goto out;
104 if (sccb->header.response_code != 0x0010) {
105 pr_warn("readcpuinfo failed (response=0x%04x)\n",
106 sccb->header.response_code);
107 rc = -EIO;
108 goto out;
109 }
110 sclp_fill_core_info(info, sccb);
111out:
112 free_pages((unsigned long) sccb, get_order(length));
113 return rc;
114}
115
116struct cpu_configure_sccb {
117 struct sccb_header header;
118} __attribute__((packed, aligned(8)));
119
120static int do_core_configure(sclp_cmdw_t cmd)
121{
122 struct cpu_configure_sccb *sccb;
123 int rc;
124
125 if (!SCLP_HAS_CPU_RECONFIG)
126 return -EOPNOTSUPP;
127 /*
128 * This is not going to cross a page boundary since we force
129 * kmalloc to have a minimum alignment of 8 bytes on s390.
130 */
131 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
132 if (!sccb)
133 return -ENOMEM;
134 sccb->header.length = sizeof(*sccb);
135 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
136 if (rc)
137 goto out;
138 switch (sccb->header.response_code) {
139 case 0x0020:
140 case 0x0120:
141 break;
142 default:
143 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
144 cmd, sccb->header.response_code);
145 rc = -EIO;
146 break;
147 }
148out:
149 kfree(sccb);
150 return rc;
151}
152
153int sclp_core_configure(u8 core)
154{
155 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
156}
157
158int sclp_core_deconfigure(u8 core)
159{
160 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
161}
162
163#ifdef CONFIG_MEMORY_HOTPLUG
164
165static DEFINE_MUTEX(sclp_mem_mutex);
166static LIST_HEAD(sclp_mem_list);
167static u8 sclp_max_storage_id;
168static DECLARE_BITMAP(sclp_storage_ids, 256);
169
170struct memory_increment {
171 struct list_head list;
172 u16 rn;
173 int standby;
174};
175
176struct assign_storage_sccb {
177 struct sccb_header header;
178 u16 rn;
179} __packed;
180
181int arch_get_memory_phys_device(unsigned long start_pfn)
182{
183 if (!sclp.rzm)
184 return 0;
185 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
186}
187
188static unsigned long long rn2addr(u16 rn)
189{
190 return (unsigned long long) (rn - 1) * sclp.rzm;
191}
192
193static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
194{
195 struct assign_storage_sccb *sccb;
196 int rc;
197
198 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
199 if (!sccb)
200 return -ENOMEM;
201 sccb->header.length = PAGE_SIZE;
202 sccb->rn = rn;
203 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
204 if (rc)
205 goto out;
206 switch (sccb->header.response_code) {
207 case 0x0020:
208 case 0x0120:
209 break;
210 default:
211 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
212 cmd, sccb->header.response_code, rn);
213 rc = -EIO;
214 break;
215 }
216out:
217 free_page((unsigned long) sccb);
218 return rc;
219}
220
221static int sclp_assign_storage(u16 rn)
222{
223 unsigned long long start;
224 int rc;
225
226 rc = do_assign_storage(0x000d0001, rn);
227 if (rc)
228 return rc;
229 start = rn2addr(rn);
230 storage_key_init_range(start, start + sclp.rzm);
231 return 0;
232}
233
234static int sclp_unassign_storage(u16 rn)
235{
236 return do_assign_storage(0x000c0001, rn);
237}
238
239struct attach_storage_sccb {
240 struct sccb_header header;
241 u16 :16;
242 u16 assigned;
243 u32 :32;
244 u32 entries[];
245} __packed;
246
247static int sclp_attach_storage(u8 id)
248{
249 struct attach_storage_sccb *sccb;
250 int rc;
251 int i;
252
253 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
254 if (!sccb)
255 return -ENOMEM;
256 sccb->header.length = PAGE_SIZE;
257 sccb->header.function_code = 0x40;
258 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
259 SCLP_QUEUE_INTERVAL);
260 if (rc)
261 goto out;
262 switch (sccb->header.response_code) {
263 case 0x0020:
264 set_bit(id, sclp_storage_ids);
265 for (i = 0; i < sccb->assigned; i++) {
266 if (sccb->entries[i])
267 sclp_unassign_storage(sccb->entries[i] >> 16);
268 }
269 break;
270 default:
271 rc = -EIO;
272 break;
273 }
274out:
275 free_page((unsigned long) sccb);
276 return rc;
277}
278
279static int sclp_mem_change_state(unsigned long start, unsigned long size,
280 int online)
281{
282 struct memory_increment *incr;
283 unsigned long long istart;
284 int rc = 0;
285
286 list_for_each_entry(incr, &sclp_mem_list, list) {
287 istart = rn2addr(incr->rn);
288 if (start + size - 1 < istart)
289 break;
290 if (start > istart + sclp.rzm - 1)
291 continue;
292 if (online)
293 rc |= sclp_assign_storage(incr->rn);
294 else
295 sclp_unassign_storage(incr->rn);
296 if (rc == 0)
297 incr->standby = online ? 0 : 1;
298 }
299 return rc ? -EIO : 0;
300}
301
302static bool contains_standby_increment(unsigned long start, unsigned long end)
303{
304 struct memory_increment *incr;
305 unsigned long istart;
306
307 list_for_each_entry(incr, &sclp_mem_list, list) {
308 istart = rn2addr(incr->rn);
309 if (end - 1 < istart)
310 continue;
311 if (start > istart + sclp.rzm - 1)
312 continue;
313 if (incr->standby)
314 return true;
315 }
316 return false;
317}
318
319static int sclp_mem_notifier(struct notifier_block *nb,
320 unsigned long action, void *data)
321{
322 unsigned long start, size;
323 struct memory_notify *arg;
324 unsigned char id;
325 int rc = 0;
326
327 arg = data;
328 start = arg->start_pfn << PAGE_SHIFT;
329 size = arg->nr_pages << PAGE_SHIFT;
330 mutex_lock(&sclp_mem_mutex);
331 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
332 sclp_attach_storage(id);
333 switch (action) {
334 case MEM_GOING_OFFLINE:
335 /*
336 * We do not allow to set memory blocks offline that contain
337 * standby memory. This is done to simplify the "memory online"
338 * case.
339 */
340 if (contains_standby_increment(start, start + size))
341 rc = -EPERM;
342 break;
343 case MEM_ONLINE:
344 case MEM_CANCEL_OFFLINE:
345 break;
346 case MEM_GOING_ONLINE:
347 rc = sclp_mem_change_state(start, size, 1);
348 break;
349 case MEM_CANCEL_ONLINE:
350 sclp_mem_change_state(start, size, 0);
351 break;
352 case MEM_OFFLINE:
353 sclp_mem_change_state(start, size, 0);
354 break;
355 default:
356 break;
357 }
358 mutex_unlock(&sclp_mem_mutex);
359 return rc ? NOTIFY_BAD : NOTIFY_OK;
360}
361
362static struct notifier_block sclp_mem_nb = {
363 .notifier_call = sclp_mem_notifier,
364};
365
366static void __init align_to_block_size(unsigned long long *start,
367 unsigned long long *size,
368 unsigned long long alignment)
369{
370 unsigned long long start_align, size_align;
371
372 start_align = roundup(*start, alignment);
373 size_align = rounddown(*start + *size, alignment) - start_align;
374
375 pr_info("Standby memory at 0x%llx (%lluM of %lluM usable)\n",
376 *start, size_align >> 20, *size >> 20);
377 *start = start_align;
378 *size = size_align;
379}
380
381static void __init add_memory_merged(u16 rn)
382{
383 unsigned long long start, size, addr, block_size;
384 static u16 first_rn, num;
385
386 if (rn && first_rn && (first_rn + num == rn)) {
387 num++;
388 return;
389 }
390 if (!first_rn)
391 goto skip_add;
392 start = rn2addr(first_rn);
393 size = (unsigned long long) num * sclp.rzm;
394 if (start >= ident_map_size)
395 goto skip_add;
396 if (start + size > ident_map_size)
397 size = ident_map_size - start;
398 block_size = memory_block_size_bytes();
399 align_to_block_size(&start, &size, block_size);
400 if (!size)
401 goto skip_add;
402 for (addr = start; addr < start + size; addr += block_size)
403 add_memory(0, addr, block_size, MHP_NONE);
404skip_add:
405 first_rn = rn;
406 num = 1;
407}
408
409static void __init sclp_add_standby_memory(void)
410{
411 struct memory_increment *incr;
412
413 list_for_each_entry(incr, &sclp_mem_list, list)
414 if (incr->standby)
415 add_memory_merged(incr->rn);
416 add_memory_merged(0);
417}
418
419static void __init insert_increment(u16 rn, int standby, int assigned)
420{
421 struct memory_increment *incr, *new_incr;
422 struct list_head *prev;
423 u16 last_rn;
424
425 new_incr = kzalloc(sizeof(*new_incr), GFP_KERNEL);
426 if (!new_incr)
427 return;
428 new_incr->rn = rn;
429 new_incr->standby = standby;
430 last_rn = 0;
431 prev = &sclp_mem_list;
432 list_for_each_entry(incr, &sclp_mem_list, list) {
433 if (assigned && incr->rn > rn)
434 break;
435 if (!assigned && incr->rn - last_rn > 1)
436 break;
437 last_rn = incr->rn;
438 prev = &incr->list;
439 }
440 if (!assigned)
441 new_incr->rn = last_rn + 1;
442 if (new_incr->rn > sclp.rnmax) {
443 kfree(new_incr);
444 return;
445 }
446 list_add(&new_incr->list, prev);
447}
448
449static int __init sclp_detect_standby_memory(void)
450{
451 struct read_storage_sccb *sccb;
452 int i, id, assigned, rc;
453
454 if (oldmem_data.start) /* No standby memory in kdump mode */
455 return 0;
456 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
457 return 0;
458 rc = -ENOMEM;
459 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
460 if (!sccb)
461 goto out;
462 assigned = 0;
463 for (id = 0; id <= sclp_max_storage_id; id++) {
464 memset(sccb, 0, PAGE_SIZE);
465 sccb->header.length = PAGE_SIZE;
466 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
467 if (rc)
468 goto out;
469 switch (sccb->header.response_code) {
470 case 0x0010:
471 set_bit(id, sclp_storage_ids);
472 for (i = 0; i < sccb->assigned; i++) {
473 if (!sccb->entries[i])
474 continue;
475 assigned++;
476 insert_increment(sccb->entries[i] >> 16, 0, 1);
477 }
478 break;
479 case 0x0310:
480 break;
481 case 0x0410:
482 for (i = 0; i < sccb->assigned; i++) {
483 if (!sccb->entries[i])
484 continue;
485 assigned++;
486 insert_increment(sccb->entries[i] >> 16, 1, 1);
487 }
488 break;
489 default:
490 rc = -EIO;
491 break;
492 }
493 if (!rc)
494 sclp_max_storage_id = sccb->max_id;
495 }
496 if (rc || list_empty(&sclp_mem_list))
497 goto out;
498 for (i = 1; i <= sclp.rnmax - assigned; i++)
499 insert_increment(0, 1, 0);
500 rc = register_memory_notifier(&sclp_mem_nb);
501 if (rc)
502 goto out;
503 sclp_add_standby_memory();
504out:
505 free_page((unsigned long) sccb);
506 return rc;
507}
508__initcall(sclp_detect_standby_memory);
509
510#endif /* CONFIG_MEMORY_HOTPLUG */
511
512/*
513 * Channel path configuration related functions.
514 */
515
516#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
517#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
518#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
519
520struct chp_cfg_sccb {
521 struct sccb_header header;
522 u8 ccm;
523 u8 reserved[6];
524 u8 cssid;
525} __attribute__((packed));
526
527static int do_chp_configure(sclp_cmdw_t cmd)
528{
529 struct chp_cfg_sccb *sccb;
530 int rc;
531
532 if (!SCLP_HAS_CHP_RECONFIG)
533 return -EOPNOTSUPP;
534 /* Prepare sccb. */
535 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
536 if (!sccb)
537 return -ENOMEM;
538 sccb->header.length = sizeof(*sccb);
539 rc = sclp_sync_request(cmd, sccb);
540 if (rc)
541 goto out;
542 switch (sccb->header.response_code) {
543 case 0x0020:
544 case 0x0120:
545 case 0x0440:
546 case 0x0450:
547 break;
548 default:
549 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
550 cmd, sccb->header.response_code);
551 rc = -EIO;
552 break;
553 }
554out:
555 free_page((unsigned long) sccb);
556 return rc;
557}
558
559/**
560 * sclp_chp_configure - perform configure channel-path sclp command
561 * @chpid: channel-path ID
562 *
563 * Perform configure channel-path command sclp command for specified chpid.
564 * Return 0 after command successfully finished, non-zero otherwise.
565 */
566int sclp_chp_configure(struct chp_id chpid)
567{
568 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
569}
570
571/**
572 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
573 * @chpid: channel-path ID
574 *
575 * Perform deconfigure channel-path command sclp command for specified chpid
576 * and wait for completion. On success return 0. Return non-zero otherwise.
577 */
578int sclp_chp_deconfigure(struct chp_id chpid)
579{
580 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
581}
582
583struct chp_info_sccb {
584 struct sccb_header header;
585 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
586 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
587 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
588 u8 ccm;
589 u8 reserved[6];
590 u8 cssid;
591} __attribute__((packed));
592
593/**
594 * sclp_chp_read_info - perform read channel-path information sclp command
595 * @info: resulting channel-path information data
596 *
597 * Perform read channel-path information sclp command and wait for completion.
598 * On success, store channel-path information in @info and return 0. Return
599 * non-zero otherwise.
600 */
601int sclp_chp_read_info(struct sclp_chp_info *info)
602{
603 struct chp_info_sccb *sccb;
604 int rc;
605
606 if (!SCLP_HAS_CHP_INFO)
607 return -EOPNOTSUPP;
608 /* Prepare sccb. */
609 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
610 if (!sccb)
611 return -ENOMEM;
612 sccb->header.length = sizeof(*sccb);
613 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
614 if (rc)
615 goto out;
616 if (sccb->header.response_code != 0x0010) {
617 pr_warn("read channel-path info failed (response=0x%04x)\n",
618 sccb->header.response_code);
619 rc = -EIO;
620 goto out;
621 }
622 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
623 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
624 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
625out:
626 free_page((unsigned long) sccb);
627 return rc;
628}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2007,2012
4 *
5 * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
6 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
7 */
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 <linux/platform_device.h>
24#include <asm/ctl_reg.h>
25#include <asm/chpid.h>
26#include <asm/setup.h>
27#include <asm/page.h>
28#include <asm/sclp.h>
29#include <asm/numa.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 /* Perform sclp request. */
64 rc = sclp_add_request(request);
65 if (rc)
66 goto out;
67 wait_for_completion(&completion);
68
69 /* Check response. */
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 * CPU configuration related functions.
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 struct read_cpu_info_sccb *sccb;
91
92 if (!SCLP_HAS_CPU_INFO)
93 return -EOPNOTSUPP;
94 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
95 if (!sccb)
96 return -ENOMEM;
97 sccb->header.length = sizeof(*sccb);
98 rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb,
99 SCLP_QUEUE_INTERVAL);
100 if (rc)
101 goto out;
102 if (sccb->header.response_code != 0x0010) {
103 pr_warn("readcpuinfo failed (response=0x%04x)\n",
104 sccb->header.response_code);
105 rc = -EIO;
106 goto out;
107 }
108 sclp_fill_core_info(info, sccb);
109out:
110 free_page((unsigned long) sccb);
111 return rc;
112}
113
114struct cpu_configure_sccb {
115 struct sccb_header header;
116} __attribute__((packed, aligned(8)));
117
118static int do_core_configure(sclp_cmdw_t cmd)
119{
120 struct cpu_configure_sccb *sccb;
121 int rc;
122
123 if (!SCLP_HAS_CPU_RECONFIG)
124 return -EOPNOTSUPP;
125 /*
126 * This is not going to cross a page boundary since we force
127 * kmalloc to have a minimum alignment of 8 bytes on s390.
128 */
129 sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA);
130 if (!sccb)
131 return -ENOMEM;
132 sccb->header.length = sizeof(*sccb);
133 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
134 if (rc)
135 goto out;
136 switch (sccb->header.response_code) {
137 case 0x0020:
138 case 0x0120:
139 break;
140 default:
141 pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n",
142 cmd, sccb->header.response_code);
143 rc = -EIO;
144 break;
145 }
146out:
147 kfree(sccb);
148 return rc;
149}
150
151int sclp_core_configure(u8 core)
152{
153 return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8);
154}
155
156int sclp_core_deconfigure(u8 core)
157{
158 return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8);
159}
160
161#ifdef CONFIG_MEMORY_HOTPLUG
162
163static DEFINE_MUTEX(sclp_mem_mutex);
164static LIST_HEAD(sclp_mem_list);
165static u8 sclp_max_storage_id;
166static DECLARE_BITMAP(sclp_storage_ids, 256);
167static int sclp_mem_state_changed;
168
169struct memory_increment {
170 struct list_head list;
171 u16 rn;
172 int standby;
173};
174
175struct assign_storage_sccb {
176 struct sccb_header header;
177 u16 rn;
178} __packed;
179
180int arch_get_memory_phys_device(unsigned long start_pfn)
181{
182 if (!sclp.rzm)
183 return 0;
184 return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm);
185}
186
187static unsigned long long rn2addr(u16 rn)
188{
189 return (unsigned long long) (rn - 1) * sclp.rzm;
190}
191
192static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
193{
194 struct assign_storage_sccb *sccb;
195 int rc;
196
197 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
198 if (!sccb)
199 return -ENOMEM;
200 sccb->header.length = PAGE_SIZE;
201 sccb->rn = rn;
202 rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL);
203 if (rc)
204 goto out;
205 switch (sccb->header.response_code) {
206 case 0x0020:
207 case 0x0120:
208 break;
209 default:
210 pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n",
211 cmd, sccb->header.response_code, rn);
212 rc = -EIO;
213 break;
214 }
215out:
216 free_page((unsigned long) sccb);
217 return rc;
218}
219
220static int sclp_assign_storage(u16 rn)
221{
222 unsigned long long start;
223 int rc;
224
225 rc = do_assign_storage(0x000d0001, rn);
226 if (rc)
227 return rc;
228 start = rn2addr(rn);
229 storage_key_init_range(start, start + sclp.rzm);
230 return 0;
231}
232
233static int sclp_unassign_storage(u16 rn)
234{
235 return do_assign_storage(0x000c0001, rn);
236}
237
238struct attach_storage_sccb {
239 struct sccb_header header;
240 u16 :16;
241 u16 assigned;
242 u32 :32;
243 u32 entries[0];
244} __packed;
245
246static int sclp_attach_storage(u8 id)
247{
248 struct attach_storage_sccb *sccb;
249 int rc;
250 int i;
251
252 sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
253 if (!sccb)
254 return -ENOMEM;
255 sccb->header.length = PAGE_SIZE;
256 sccb->header.function_code = 0x40;
257 rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb,
258 SCLP_QUEUE_INTERVAL);
259 if (rc)
260 goto out;
261 switch (sccb->header.response_code) {
262 case 0x0020:
263 set_bit(id, sclp_storage_ids);
264 for (i = 0; i < sccb->assigned; i++) {
265 if (sccb->entries[i])
266 sclp_unassign_storage(sccb->entries[i] >> 16);
267 }
268 break;
269 default:
270 rc = -EIO;
271 break;
272 }
273out:
274 free_page((unsigned long) sccb);
275 return rc;
276}
277
278static int sclp_mem_change_state(unsigned long start, unsigned long size,
279 int online)
280{
281 struct memory_increment *incr;
282 unsigned long long istart;
283 int rc = 0;
284
285 list_for_each_entry(incr, &sclp_mem_list, list) {
286 istart = rn2addr(incr->rn);
287 if (start + size - 1 < istart)
288 break;
289 if (start > istart + sclp.rzm - 1)
290 continue;
291 if (online)
292 rc |= sclp_assign_storage(incr->rn);
293 else
294 sclp_unassign_storage(incr->rn);
295 if (rc == 0)
296 incr->standby = online ? 0 : 1;
297 }
298 return rc ? -EIO : 0;
299}
300
301static bool contains_standby_increment(unsigned long start, unsigned long end)
302{
303 struct memory_increment *incr;
304 unsigned long istart;
305
306 list_for_each_entry(incr, &sclp_mem_list, list) {
307 istart = rn2addr(incr->rn);
308 if (end - 1 < istart)
309 continue;
310 if (start > istart + sclp.rzm - 1)
311 continue;
312 if (incr->standby)
313 return true;
314 }
315 return false;
316}
317
318static int sclp_mem_notifier(struct notifier_block *nb,
319 unsigned long action, void *data)
320{
321 unsigned long start, size;
322 struct memory_notify *arg;
323 unsigned char id;
324 int rc = 0;
325
326 arg = data;
327 start = arg->start_pfn << PAGE_SHIFT;
328 size = arg->nr_pages << PAGE_SHIFT;
329 mutex_lock(&sclp_mem_mutex);
330 for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1)
331 sclp_attach_storage(id);
332 switch (action) {
333 case MEM_GOING_OFFLINE:
334 /*
335 * We do not allow to set memory blocks offline that contain
336 * standby memory. This is done to simplify the "memory online"
337 * case.
338 */
339 if (contains_standby_increment(start, start + size))
340 rc = -EPERM;
341 break;
342 case MEM_ONLINE:
343 case MEM_CANCEL_OFFLINE:
344 break;
345 case MEM_GOING_ONLINE:
346 rc = sclp_mem_change_state(start, size, 1);
347 break;
348 case MEM_CANCEL_ONLINE:
349 sclp_mem_change_state(start, size, 0);
350 break;
351 case MEM_OFFLINE:
352 sclp_mem_change_state(start, size, 0);
353 break;
354 default:
355 rc = -EINVAL;
356 break;
357 }
358 if (!rc)
359 sclp_mem_state_changed = 1;
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 (memory_end_set && (start >= memory_end))
401 goto skip_add;
402 if (memory_end_set && (start + size > memory_end))
403 size = memory_end - 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(numa_pfn_to_nid(PFN_DOWN(addr)), addr, block_size);
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 sclp_mem_freeze(struct device *dev)
456{
457 if (!sclp_mem_state_changed)
458 return 0;
459 pr_err("Memory hotplug state changed, suspend refused.\n");
460 return -EPERM;
461}
462
463static const struct dev_pm_ops sclp_mem_pm_ops = {
464 .freeze = sclp_mem_freeze,
465};
466
467static struct platform_driver sclp_mem_pdrv = {
468 .driver = {
469 .name = "sclp_mem",
470 .pm = &sclp_mem_pm_ops,
471 },
472};
473
474static int __init sclp_detect_standby_memory(void)
475{
476 struct platform_device *sclp_pdev;
477 struct read_storage_sccb *sccb;
478 int i, id, assigned, rc;
479
480 if (OLDMEM_BASE) /* No standby memory in kdump mode */
481 return 0;
482 if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL)
483 return 0;
484 rc = -ENOMEM;
485 sccb = (void *) __get_free_page(GFP_KERNEL | GFP_DMA);
486 if (!sccb)
487 goto out;
488 assigned = 0;
489 for (id = 0; id <= sclp_max_storage_id; id++) {
490 memset(sccb, 0, PAGE_SIZE);
491 sccb->header.length = PAGE_SIZE;
492 rc = sclp_sync_request(SCLP_CMDW_READ_STORAGE_INFO | id << 8, sccb);
493 if (rc)
494 goto out;
495 switch (sccb->header.response_code) {
496 case 0x0010:
497 set_bit(id, sclp_storage_ids);
498 for (i = 0; i < sccb->assigned; i++) {
499 if (!sccb->entries[i])
500 continue;
501 assigned++;
502 insert_increment(sccb->entries[i] >> 16, 0, 1);
503 }
504 break;
505 case 0x0310:
506 break;
507 case 0x0410:
508 for (i = 0; i < sccb->assigned; i++) {
509 if (!sccb->entries[i])
510 continue;
511 assigned++;
512 insert_increment(sccb->entries[i] >> 16, 1, 1);
513 }
514 break;
515 default:
516 rc = -EIO;
517 break;
518 }
519 if (!rc)
520 sclp_max_storage_id = sccb->max_id;
521 }
522 if (rc || list_empty(&sclp_mem_list))
523 goto out;
524 for (i = 1; i <= sclp.rnmax - assigned; i++)
525 insert_increment(0, 1, 0);
526 rc = register_memory_notifier(&sclp_mem_nb);
527 if (rc)
528 goto out;
529 rc = platform_driver_register(&sclp_mem_pdrv);
530 if (rc)
531 goto out;
532 sclp_pdev = platform_device_register_simple("sclp_mem", -1, NULL, 0);
533 rc = PTR_ERR_OR_ZERO(sclp_pdev);
534 if (rc)
535 goto out_driver;
536 sclp_add_standby_memory();
537 goto out;
538out_driver:
539 platform_driver_unregister(&sclp_mem_pdrv);
540out:
541 free_page((unsigned long) sccb);
542 return rc;
543}
544__initcall(sclp_detect_standby_memory);
545
546#endif /* CONFIG_MEMORY_HOTPLUG */
547
548/*
549 * Channel path configuration related functions.
550 */
551
552#define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001
553#define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001
554#define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001
555
556struct chp_cfg_sccb {
557 struct sccb_header header;
558 u8 ccm;
559 u8 reserved[6];
560 u8 cssid;
561} __attribute__((packed));
562
563static int do_chp_configure(sclp_cmdw_t cmd)
564{
565 struct chp_cfg_sccb *sccb;
566 int rc;
567
568 if (!SCLP_HAS_CHP_RECONFIG)
569 return -EOPNOTSUPP;
570 /* Prepare sccb. */
571 sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
572 if (!sccb)
573 return -ENOMEM;
574 sccb->header.length = sizeof(*sccb);
575 rc = sclp_sync_request(cmd, sccb);
576 if (rc)
577 goto out;
578 switch (sccb->header.response_code) {
579 case 0x0020:
580 case 0x0120:
581 case 0x0440:
582 case 0x0450:
583 break;
584 default:
585 pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n",
586 cmd, sccb->header.response_code);
587 rc = -EIO;
588 break;
589 }
590out:
591 free_page((unsigned long) sccb);
592 return rc;
593}
594
595/**
596 * sclp_chp_configure - perform configure channel-path sclp command
597 * @chpid: channel-path ID
598 *
599 * Perform configure channel-path command sclp command for specified chpid.
600 * Return 0 after command successfully finished, non-zero otherwise.
601 */
602int sclp_chp_configure(struct chp_id chpid)
603{
604 return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8);
605}
606
607/**
608 * sclp_chp_deconfigure - perform deconfigure channel-path sclp command
609 * @chpid: channel-path ID
610 *
611 * Perform deconfigure channel-path command sclp command for specified chpid
612 * and wait for completion. On success return 0. Return non-zero otherwise.
613 */
614int sclp_chp_deconfigure(struct chp_id chpid)
615{
616 return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8);
617}
618
619struct chp_info_sccb {
620 struct sccb_header header;
621 u8 recognized[SCLP_CHP_INFO_MASK_SIZE];
622 u8 standby[SCLP_CHP_INFO_MASK_SIZE];
623 u8 configured[SCLP_CHP_INFO_MASK_SIZE];
624 u8 ccm;
625 u8 reserved[6];
626 u8 cssid;
627} __attribute__((packed));
628
629/**
630 * sclp_chp_read_info - perform read channel-path information sclp command
631 * @info: resulting channel-path information data
632 *
633 * Perform read channel-path information sclp command and wait for completion.
634 * On success, store channel-path information in @info and return 0. Return
635 * non-zero otherwise.
636 */
637int sclp_chp_read_info(struct sclp_chp_info *info)
638{
639 struct chp_info_sccb *sccb;
640 int rc;
641
642 if (!SCLP_HAS_CHP_INFO)
643 return -EOPNOTSUPP;
644 /* Prepare sccb. */
645 sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
646 if (!sccb)
647 return -ENOMEM;
648 sccb->header.length = sizeof(*sccb);
649 rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
650 if (rc)
651 goto out;
652 if (sccb->header.response_code != 0x0010) {
653 pr_warn("read channel-path info failed (response=0x%04x)\n",
654 sccb->header.response_code);
655 rc = -EIO;
656 goto out;
657 }
658 memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE);
659 memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE);
660 memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE);
661out:
662 free_page((unsigned long) sccb);
663 return rc;
664}