Commit | Line | Data |
---|---|---|
08d07968 | 1 | /* |
7441b062 | 2 | * Copyright IBM Corp. 2007,2012 |
08d07968 | 3 | * |
03997904 GS |
4 | * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>, |
5 | * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | |
08d07968 HC |
6 | */ |
7 | ||
b3ff088b MS |
8 | #define KMSG_COMPONENT "sclp_cmd" |
9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
10 | ||
08d07968 HC |
11 | #include <linux/completion.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/errno.h> | |
03997904 | 14 | #include <linux/err.h> |
7441b062 | 15 | #include <linux/export.h> |
08d07968 HC |
16 | #include <linux/slab.h> |
17 | #include <linux/string.h> | |
e0bc2495 HC |
18 | #include <linux/mm.h> |
19 | #include <linux/mmzone.h> | |
20 | #include <linux/memory.h> | |
1526bf9c | 21 | #include <linux/module.h> |
03997904 | 22 | #include <linux/platform_device.h> |
6b70a920 | 23 | #include <asm/ctl_reg.h> |
4b28a8fe | 24 | #include <asm/chpid.h> |
23d75d9c | 25 | #include <asm/setup.h> |
6b70a920 HC |
26 | #include <asm/page.h> |
27 | #include <asm/sclp.h> | |
c29a7baf | 28 | #include <asm/numa.h> |
08d07968 | 29 | |
b3ff088b | 30 | #include "sclp.h" |
08d07968 | 31 | |
08d07968 HC |
32 | static void sclp_sync_callback(struct sclp_req *req, void *data) |
33 | { | |
34 | struct completion *completion = data; | |
35 | ||
36 | complete(completion); | |
37 | } | |
38 | ||
d475f942 | 39 | int sclp_sync_request(sclp_cmdw_t cmd, void *sccb) |
9f0128f9 GS |
40 | { |
41 | return sclp_sync_request_timeout(cmd, sccb, 0); | |
42 | } | |
43 | ||
44 | int sclp_sync_request_timeout(sclp_cmdw_t cmd, void *sccb, int timeout) | |
08d07968 HC |
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; | |
9f0128f9 GS |
53 | if (timeout) |
54 | request->queue_timeout = timeout; | |
08d07968 HC |
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) { | |
baebc70a JP |
70 | pr_warn("sync request failed (cmd=0x%08x, status=0x%02x)\n", |
71 | cmd, request->status); | |
08d07968 HC |
72 | rc = -EIO; |
73 | } | |
74 | out: | |
75 | kfree(request); | |
76 | return rc; | |
77 | } | |
78 | ||
79 | /* | |
80 | * CPU configuration related functions. | |
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 | ||
87 | struct 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 | ||
d08d9430 MS |
96 | static void sclp_fill_core_info(struct sclp_core_info *info, |
97 | struct read_cpu_info_sccb *sccb) | |
08d07968 HC |
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; | |
d08d9430 MS |
105 | memcpy(&info->core, page + sccb->offset_configured, |
106 | info->combined * sizeof(struct sclp_core_entry)); | |
08d07968 HC |
107 | } |
108 | ||
d08d9430 | 109 | int sclp_get_core_info(struct sclp_core_info *info) |
08d07968 HC |
110 | { |
111 | int rc; | |
112 | struct read_cpu_info_sccb *sccb; | |
113 | ||
114 | if (!SCLP_HAS_CPU_INFO) | |
115 | return -EOPNOTSUPP; | |
48483b32 | 116 | sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA); |
08d07968 HC |
117 | if (!sccb) |
118 | return -ENOMEM; | |
08d07968 | 119 | sccb->header.length = sizeof(*sccb); |
9f0128f9 GS |
120 | rc = sclp_sync_request_timeout(SCLP_CMDW_READ_CPU_INFO, sccb, |
121 | SCLP_QUEUE_INTERVAL); | |
08d07968 HC |
122 | if (rc) |
123 | goto out; | |
124 | if (sccb->header.response_code != 0x0010) { | |
baebc70a JP |
125 | pr_warn("readcpuinfo failed (response=0x%04x)\n", |
126 | sccb->header.response_code); | |
08d07968 HC |
127 | rc = -EIO; |
128 | goto out; | |
129 | } | |
d08d9430 | 130 | sclp_fill_core_info(info, sccb); |
08d07968 HC |
131 | out: |
132 | free_page((unsigned long) sccb); | |
133 | return rc; | |
134 | } | |
135 | ||
08d07968 HC |
136 | struct cpu_configure_sccb { |
137 | struct sccb_header header; | |
138 | } __attribute__((packed, aligned(8))); | |
139 | ||
d08d9430 | 140 | static int do_core_configure(sclp_cmdw_t cmd) |
08d07968 HC |
141 | { |
142 | struct cpu_configure_sccb *sccb; | |
143 | int rc; | |
144 | ||
145 | if (!SCLP_HAS_CPU_RECONFIG) | |
146 | return -EOPNOTSUPP; | |
147 | /* | |
148 | * This is not going to cross a page boundary since we force | |
149 | * kmalloc to have a minimum alignment of 8 bytes on s390. | |
150 | */ | |
151 | sccb = kzalloc(sizeof(*sccb), GFP_KERNEL | GFP_DMA); | |
152 | if (!sccb) | |
153 | return -ENOMEM; | |
154 | sccb->header.length = sizeof(*sccb); | |
9f0128f9 | 155 | rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL); |
08d07968 HC |
156 | if (rc) |
157 | goto out; | |
158 | switch (sccb->header.response_code) { | |
159 | case 0x0020: | |
160 | case 0x0120: | |
161 | break; | |
162 | default: | |
baebc70a JP |
163 | pr_warn("configure cpu failed (cmd=0x%08x, response=0x%04x)\n", |
164 | cmd, sccb->header.response_code); | |
08d07968 HC |
165 | rc = -EIO; |
166 | break; | |
167 | } | |
168 | out: | |
169 | kfree(sccb); | |
170 | return rc; | |
171 | } | |
172 | ||
d08d9430 | 173 | int sclp_core_configure(u8 core) |
08d07968 | 174 | { |
d08d9430 | 175 | return do_core_configure(SCLP_CMDW_CONFIGURE_CPU | core << 8); |
08d07968 HC |
176 | } |
177 | ||
d08d9430 | 178 | int sclp_core_deconfigure(u8 core) |
08d07968 | 179 | { |
d08d9430 | 180 | return do_core_configure(SCLP_CMDW_DECONFIGURE_CPU | core << 8); |
08d07968 | 181 | } |
4b28a8fe | 182 | |
e0bc2495 HC |
183 | #ifdef CONFIG_MEMORY_HOTPLUG |
184 | ||
185 | static DEFINE_MUTEX(sclp_mem_mutex); | |
186 | static LIST_HEAD(sclp_mem_list); | |
187 | static u8 sclp_max_storage_id; | |
b8a43b04 | 188 | static DECLARE_BITMAP(sclp_storage_ids, 256); |
03997904 | 189 | static int sclp_mem_state_changed; |
e0bc2495 HC |
190 | |
191 | struct memory_increment { | |
192 | struct list_head list; | |
193 | u16 rn; | |
194 | int standby; | |
e0bc2495 HC |
195 | }; |
196 | ||
197 | struct assign_storage_sccb { | |
198 | struct sccb_header header; | |
199 | u16 rn; | |
200 | } __packed; | |
201 | ||
9c95258c HC |
202 | int arch_get_memory_phys_device(unsigned long start_pfn) |
203 | { | |
37c5f6c8 | 204 | if (!sclp.rzm) |
9c95258c | 205 | return 0; |
37c5f6c8 | 206 | return PFN_PHYS(start_pfn) >> ilog2(sclp.rzm); |
9c95258c HC |
207 | } |
208 | ||
e0bc2495 HC |
209 | static unsigned long long rn2addr(u16 rn) |
210 | { | |
37c5f6c8 | 211 | return (unsigned long long) (rn - 1) * sclp.rzm; |
e0bc2495 HC |
212 | } |
213 | ||
214 | static 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; | |
9f0128f9 | 224 | rc = sclp_sync_request_timeout(cmd, sccb, SCLP_QUEUE_INTERVAL); |
e0bc2495 HC |
225 | if (rc) |
226 | goto out; | |
227 | switch (sccb->header.response_code) { | |
228 | case 0x0020: | |
229 | case 0x0120: | |
230 | break; | |
231 | default: | |
baebc70a JP |
232 | pr_warn("assign storage failed (cmd=0x%08x, response=0x%04x, rn=0x%04x)\n", |
233 | cmd, sccb->header.response_code, rn); | |
e0bc2495 HC |
234 | rc = -EIO; |
235 | break; | |
236 | } | |
237 | out: | |
238 | free_page((unsigned long) sccb); | |
239 | return rc; | |
240 | } | |
241 | ||
242 | static int sclp_assign_storage(u16 rn) | |
243 | { | |
6b70a920 | 244 | unsigned long long start; |
0cd2f620 HC |
245 | int rc; |
246 | ||
247 | rc = do_assign_storage(0x000d0001, rn); | |
248 | if (rc) | |
6b70a920 HC |
249 | return rc; |
250 | start = rn2addr(rn); | |
37c5f6c8 | 251 | storage_key_init_range(start, start + sclp.rzm); |
6b70a920 | 252 | return 0; |
e0bc2495 HC |
253 | } |
254 | ||
255 | static int sclp_unassign_storage(u16 rn) | |
256 | { | |
257 | return do_assign_storage(0x000c0001, rn); | |
258 | } | |
259 | ||
260 | struct attach_storage_sccb { | |
261 | struct sccb_header header; | |
262 | u16 :16; | |
263 | u16 assigned; | |
264 | u32 :32; | |
265 | u32 entries[0]; | |
266 | } __packed; | |
267 | ||
268 | static 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; | |
9f0128f9 GS |
278 | rc = sclp_sync_request_timeout(0x00080001 | id << 8, sccb, |
279 | SCLP_QUEUE_INTERVAL); | |
e0bc2495 HC |
280 | if (rc) |
281 | goto out; | |
282 | switch (sccb->header.response_code) { | |
283 | case 0x0020: | |
284 | set_bit(id, sclp_storage_ids); | |
8adb4ca3 HC |
285 | for (i = 0; i < sccb->assigned; i++) { |
286 | if (sccb->entries[i]) | |
287 | sclp_unassign_storage(sccb->entries[i] >> 16); | |
288 | } | |
e0bc2495 HC |
289 | break; |
290 | default: | |
291 | rc = -EIO; | |
292 | break; | |
293 | } | |
294 | out: | |
295 | free_page((unsigned long) sccb); | |
296 | return rc; | |
297 | } | |
298 | ||
299 | static 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; | |
37c5f6c8 | 310 | if (start > istart + sclp.rzm - 1) |
e0bc2495 | 311 | continue; |
15535560 | 312 | if (online) |
e0bc2495 | 313 | rc |= sclp_assign_storage(incr->rn); |
15535560 | 314 | else |
e0bc2495 | 315 | sclp_unassign_storage(incr->rn); |
8741ce6d MH |
316 | if (rc == 0) |
317 | incr->standby = online ? 0 : 1; | |
e0bc2495 HC |
318 | } |
319 | return rc ? -EIO : 0; | |
320 | } | |
321 | ||
8741ce6d MH |
322 | static 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; | |
37c5f6c8 | 331 | if (start > istart + sclp.rzm - 1) |
8741ce6d MH |
332 | continue; |
333 | if (incr->standby) | |
334 | return true; | |
335 | } | |
336 | return false; | |
337 | } | |
338 | ||
e0bc2495 HC |
339 | static 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); | |
fc89db4b AM |
351 | for_each_clear_bit(id, sclp_storage_ids, sclp_max_storage_id + 1) |
352 | sclp_attach_storage(id); | |
e0bc2495 | 353 | switch (action) { |
7e9238fb | 354 | case MEM_GOING_OFFLINE: |
8741ce6d MH |
355 | /* |
356 | * We do not allow to set memory blocks offline that contain | |
357 | * standby memory. This is done to simplify the "memory online" | |
358 | * case. | |
359 | */ | |
360 | if (contains_standby_increment(start, start + size)) | |
361 | rc = -EPERM; | |
362 | break; | |
363 | case MEM_ONLINE: | |
7e9238fb | 364 | case MEM_CANCEL_OFFLINE: |
e0bc2495 HC |
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; | |
7e9238fb GS |
372 | case MEM_OFFLINE: |
373 | sclp_mem_change_state(start, size, 0); | |
374 | break; | |
e0bc2495 HC |
375 | default: |
376 | rc = -EINVAL; | |
377 | break; | |
378 | } | |
03997904 GS |
379 | if (!rc) |
380 | sclp_mem_state_changed = 1; | |
e0bc2495 HC |
381 | mutex_unlock(&sclp_mem_mutex); |
382 | return rc ? NOTIFY_BAD : NOTIFY_OK; | |
383 | } | |
384 | ||
385 | static struct notifier_block sclp_mem_nb = { | |
386 | .notifier_call = sclp_mem_notifier, | |
387 | }; | |
388 | ||
8741ce6d | 389 | static void __init align_to_block_size(unsigned long long *start, |
c29a7baf MH |
390 | unsigned long long *size, |
391 | unsigned long long alignment) | |
8741ce6d | 392 | { |
c29a7baf | 393 | unsigned long long start_align, size_align; |
8741ce6d | 394 | |
8741ce6d MH |
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 | ||
e0bc2495 HC |
404 | static void __init add_memory_merged(u16 rn) |
405 | { | |
c29a7baf | 406 | unsigned long long start, size, addr, block_size; |
e0bc2495 | 407 | static u16 first_rn, num; |
e0bc2495 HC |
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); | |
37c5f6c8 | 416 | size = (unsigned long long) num * sclp.rzm; |
e0bc2495 HC |
417 | if (start >= VMEM_MAX_PHYS) |
418 | goto skip_add; | |
419 | if (start + size > VMEM_MAX_PHYS) | |
420 | size = VMEM_MAX_PHYS - start; | |
23d75d9c HC |
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; | |
c29a7baf MH |
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); | |
e0bc2495 HC |
431 | skip_add: |
432 | first_rn = rn; | |
433 | num = 1; | |
434 | } | |
435 | ||
436 | static 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 | ||
446 | static 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; | |
37c5f6c8 | 469 | if (new_incr->rn > sclp.rnmax) { |
e0bc2495 HC |
470 | kfree(new_incr); |
471 | return; | |
472 | } | |
473 | list_add(&new_incr->list, prev); | |
474 | } | |
475 | ||
03997904 GS |
476 | static 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 | ||
e0bc2495 HC |
484 | struct 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 | ||
47145210 | 493 | static const struct dev_pm_ops sclp_mem_pm_ops = { |
03997904 GS |
494 | .freeze = sclp_mem_freeze, |
495 | }; | |
496 | ||
497 | static struct platform_driver sclp_mem_pdrv = { | |
498 | .driver = { | |
499 | .name = "sclp_mem", | |
500 | .pm = &sclp_mem_pm_ops, | |
501 | }, | |
502 | }; | |
503 | ||
e0bc2495 HC |
504 | static int __init sclp_detect_standby_memory(void) |
505 | { | |
03997904 | 506 | struct platform_device *sclp_pdev; |
e0bc2495 HC |
507 | struct read_storage_sccb *sccb; |
508 | int i, id, assigned, rc; | |
509 | ||
52319b45 MH |
510 | if (OLDMEM_BASE) /* No standby memory in kdump mode */ |
511 | return 0; | |
78335a30 | 512 | if ((sclp.facilities & 0xe00000000000ULL) != 0xe00000000000ULL) |
e0bc2495 HC |
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; | |
d475f942 | 522 | rc = sclp_sync_request(0x00040001 | id << 8, sccb); |
e0bc2495 HC |
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; | |
37c5f6c8 | 554 | for (i = 1; i <= sclp.rnmax - assigned; i++) |
e0bc2495 HC |
555 | insert_increment(0, 1, 0); |
556 | rc = register_memory_notifier(&sclp_mem_nb); | |
557 | if (rc) | |
558 | goto out; | |
03997904 GS |
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); | |
5896f8fe | 563 | rc = PTR_ERR_OR_ZERO(sclp_pdev); |
03997904 GS |
564 | if (rc) |
565 | goto out_driver; | |
e0bc2495 | 566 | sclp_add_standby_memory(); |
03997904 GS |
567 | goto out; |
568 | out_driver: | |
569 | platform_driver_unregister(&sclp_mem_pdrv); | |
e0bc2495 HC |
570 | out: |
571 | free_page((unsigned long) sccb); | |
572 | return rc; | |
573 | } | |
574 | __initcall(sclp_detect_standby_memory); | |
575 | ||
576 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
577 | ||
4b28a8fe HC |
578 | /* |
579 | * Channel path configuration related functions. | |
580 | */ | |
581 | ||
582 | #define SCLP_CMDW_CONFIGURE_CHPATH 0x000f0001 | |
583 | #define SCLP_CMDW_DECONFIGURE_CHPATH 0x000e0001 | |
584 | #define SCLP_CMDW_READ_CHPATH_INFORMATION 0x00030001 | |
585 | ||
586 | struct chp_cfg_sccb { | |
587 | struct sccb_header header; | |
588 | u8 ccm; | |
589 | u8 reserved[6]; | |
590 | u8 cssid; | |
591 | } __attribute__((packed)); | |
592 | ||
593 | static int do_chp_configure(sclp_cmdw_t cmd) | |
594 | { | |
595 | struct chp_cfg_sccb *sccb; | |
596 | int rc; | |
597 | ||
598 | if (!SCLP_HAS_CHP_RECONFIG) | |
599 | return -EOPNOTSUPP; | |
600 | /* Prepare sccb. */ | |
601 | sccb = (struct chp_cfg_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
602 | if (!sccb) | |
603 | return -ENOMEM; | |
604 | sccb->header.length = sizeof(*sccb); | |
d475f942 | 605 | rc = sclp_sync_request(cmd, sccb); |
4b28a8fe HC |
606 | if (rc) |
607 | goto out; | |
608 | switch (sccb->header.response_code) { | |
609 | case 0x0020: | |
610 | case 0x0120: | |
611 | case 0x0440: | |
612 | case 0x0450: | |
613 | break; | |
614 | default: | |
baebc70a JP |
615 | pr_warn("configure channel-path failed (cmd=0x%08x, response=0x%04x)\n", |
616 | cmd, sccb->header.response_code); | |
4b28a8fe HC |
617 | rc = -EIO; |
618 | break; | |
619 | } | |
620 | out: | |
621 | free_page((unsigned long) sccb); | |
622 | return rc; | |
623 | } | |
624 | ||
625 | /** | |
626 | * sclp_chp_configure - perform configure channel-path sclp command | |
627 | * @chpid: channel-path ID | |
628 | * | |
629 | * Perform configure channel-path command sclp command for specified chpid. | |
630 | * Return 0 after command successfully finished, non-zero otherwise. | |
631 | */ | |
632 | int sclp_chp_configure(struct chp_id chpid) | |
633 | { | |
634 | return do_chp_configure(SCLP_CMDW_CONFIGURE_CHPATH | chpid.id << 8); | |
635 | } | |
636 | ||
637 | /** | |
638 | * sclp_chp_deconfigure - perform deconfigure channel-path sclp command | |
639 | * @chpid: channel-path ID | |
640 | * | |
641 | * Perform deconfigure channel-path command sclp command for specified chpid | |
642 | * and wait for completion. On success return 0. Return non-zero otherwise. | |
643 | */ | |
644 | int sclp_chp_deconfigure(struct chp_id chpid) | |
645 | { | |
646 | return do_chp_configure(SCLP_CMDW_DECONFIGURE_CHPATH | chpid.id << 8); | |
647 | } | |
648 | ||
649 | struct chp_info_sccb { | |
650 | struct sccb_header header; | |
651 | u8 recognized[SCLP_CHP_INFO_MASK_SIZE]; | |
652 | u8 standby[SCLP_CHP_INFO_MASK_SIZE]; | |
653 | u8 configured[SCLP_CHP_INFO_MASK_SIZE]; | |
654 | u8 ccm; | |
655 | u8 reserved[6]; | |
656 | u8 cssid; | |
657 | } __attribute__((packed)); | |
658 | ||
659 | /** | |
660 | * sclp_chp_read_info - perform read channel-path information sclp command | |
661 | * @info: resulting channel-path information data | |
662 | * | |
663 | * Perform read channel-path information sclp command and wait for completion. | |
664 | * On success, store channel-path information in @info and return 0. Return | |
665 | * non-zero otherwise. | |
666 | */ | |
667 | int sclp_chp_read_info(struct sclp_chp_info *info) | |
668 | { | |
669 | struct chp_info_sccb *sccb; | |
670 | int rc; | |
671 | ||
672 | if (!SCLP_HAS_CHP_INFO) | |
673 | return -EOPNOTSUPP; | |
674 | /* Prepare sccb. */ | |
675 | sccb = (struct chp_info_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA); | |
676 | if (!sccb) | |
677 | return -ENOMEM; | |
678 | sccb->header.length = sizeof(*sccb); | |
d475f942 | 679 | rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb); |
4b28a8fe HC |
680 | if (rc) |
681 | goto out; | |
682 | if (sccb->header.response_code != 0x0010) { | |
baebc70a JP |
683 | pr_warn("read channel-path info failed (response=0x%04x)\n", |
684 | sccb->header.response_code); | |
4b28a8fe HC |
685 | rc = -EIO; |
686 | goto out; | |
687 | } | |
688 | memcpy(info->recognized, sccb->recognized, SCLP_CHP_INFO_MASK_SIZE); | |
689 | memcpy(info->standby, sccb->standby, SCLP_CHP_INFO_MASK_SIZE); | |
690 | memcpy(info->configured, sccb->configured, SCLP_CHP_INFO_MASK_SIZE); | |
691 | out: | |
692 | free_page((unsigned long) sccb); | |
693 | return rc; | |
694 | } |