Commit | Line | Data |
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c672528a CC |
1 | /* |
2 | * Copyright (C) 2012 Google, Inc. | |
3 | * | |
4 | * This software is licensed under the terms of the GNU General Public | |
5 | * License version 2, as published by the Free Software Foundation, and | |
6 | * may be copied, distributed, and modified under those terms. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | * | |
13 | */ | |
14 | ||
ef748853 FF |
15 | #define pr_fmt(fmt) "persistent_ram: " fmt |
16 | ||
404a6043 CC |
17 | #include <linux/device.h> |
18 | #include <linux/err.h> | |
c672528a CC |
19 | #include <linux/errno.h> |
20 | #include <linux/kernel.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/io.h> | |
404a6043 CC |
23 | #include <linux/list.h> |
24 | #include <linux/memblock.h> | |
9cc05ad9 | 25 | #include <linux/rslib.h> |
c672528a | 26 | #include <linux/slab.h> |
404a6043 | 27 | #include <linux/vmalloc.h> |
cddb8751 | 28 | #include <linux/pstore_ram.h> |
24c3d2f3 | 29 | #include <asm/page.h> |
c672528a | 30 | |
c672528a CC |
31 | struct persistent_ram_buffer { |
32 | uint32_t sig; | |
808d0387 CC |
33 | atomic_t start; |
34 | atomic_t size; | |
c672528a CC |
35 | uint8_t data[0]; |
36 | }; | |
37 | ||
38 | #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */ | |
39 | ||
808d0387 CC |
40 | static inline size_t buffer_size(struct persistent_ram_zone *prz) |
41 | { | |
42 | return atomic_read(&prz->buffer->size); | |
43 | } | |
44 | ||
45 | static inline size_t buffer_start(struct persistent_ram_zone *prz) | |
46 | { | |
47 | return atomic_read(&prz->buffer->start); | |
48 | } | |
49 | ||
50 | /* increase and wrap the start pointer, returning the old value */ | |
0405a5ce | 51 | static size_t buffer_start_add_atomic(struct persistent_ram_zone *prz, size_t a) |
808d0387 CC |
52 | { |
53 | int old; | |
54 | int new; | |
55 | ||
56 | do { | |
57 | old = atomic_read(&prz->buffer->start); | |
58 | new = old + a; | |
017321cf | 59 | while (unlikely(new >= prz->buffer_size)) |
808d0387 CC |
60 | new -= prz->buffer_size; |
61 | } while (atomic_cmpxchg(&prz->buffer->start, old, new) != old); | |
62 | ||
63 | return old; | |
64 | } | |
65 | ||
66 | /* increase the size counter until it hits the max size */ | |
0405a5ce | 67 | static void buffer_size_add_atomic(struct persistent_ram_zone *prz, size_t a) |
808d0387 CC |
68 | { |
69 | size_t old; | |
70 | size_t new; | |
71 | ||
72 | if (atomic_read(&prz->buffer->size) == prz->buffer_size) | |
73 | return; | |
74 | ||
75 | do { | |
76 | old = atomic_read(&prz->buffer->size); | |
77 | new = old + a; | |
78 | if (new > prz->buffer_size) | |
79 | new = prz->buffer_size; | |
80 | } while (atomic_cmpxchg(&prz->buffer->size, old, new) != old); | |
81 | } | |
82 | ||
0405a5ce RH |
83 | static DEFINE_RAW_SPINLOCK(buffer_lock); |
84 | ||
85 | /* increase and wrap the start pointer, returning the old value */ | |
86 | static size_t buffer_start_add_locked(struct persistent_ram_zone *prz, size_t a) | |
87 | { | |
88 | int old; | |
89 | int new; | |
90 | unsigned long flags; | |
91 | ||
92 | raw_spin_lock_irqsave(&buffer_lock, flags); | |
93 | ||
94 | old = atomic_read(&prz->buffer->start); | |
95 | new = old + a; | |
017321cf | 96 | while (unlikely(new >= prz->buffer_size)) |
0405a5ce RH |
97 | new -= prz->buffer_size; |
98 | atomic_set(&prz->buffer->start, new); | |
99 | ||
100 | raw_spin_unlock_irqrestore(&buffer_lock, flags); | |
101 | ||
102 | return old; | |
103 | } | |
104 | ||
105 | /* increase the size counter until it hits the max size */ | |
106 | static void buffer_size_add_locked(struct persistent_ram_zone *prz, size_t a) | |
107 | { | |
108 | size_t old; | |
109 | size_t new; | |
110 | unsigned long flags; | |
111 | ||
112 | raw_spin_lock_irqsave(&buffer_lock, flags); | |
113 | ||
114 | old = atomic_read(&prz->buffer->size); | |
115 | if (old == prz->buffer_size) | |
116 | goto exit; | |
117 | ||
118 | new = old + a; | |
119 | if (new > prz->buffer_size) | |
120 | new = prz->buffer_size; | |
121 | atomic_set(&prz->buffer->size, new); | |
122 | ||
123 | exit: | |
124 | raw_spin_unlock_irqrestore(&buffer_lock, flags); | |
125 | } | |
126 | ||
127 | static size_t (*buffer_start_add)(struct persistent_ram_zone *, size_t) = buffer_start_add_atomic; | |
128 | static void (*buffer_size_add)(struct persistent_ram_zone *, size_t) = buffer_size_add_atomic; | |
129 | ||
a15d0b36 | 130 | static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, |
c672528a CC |
131 | uint8_t *data, size_t len, uint8_t *ecc) |
132 | { | |
133 | int i; | |
c31ad081 | 134 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 135 | |
c672528a CC |
136 | /* Initialize the parity buffer */ |
137 | memset(par, 0, sizeof(par)); | |
138 | encode_rs8(prz->rs_decoder, data, len, par, 0); | |
c31ad081 | 139 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
140 | ecc[i] = par[i]; |
141 | } | |
142 | ||
143 | static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, | |
144 | void *data, size_t len, uint8_t *ecc) | |
145 | { | |
146 | int i; | |
c31ad081 | 147 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 148 | |
c31ad081 | 149 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
150 | par[i] = ecc[i]; |
151 | return decode_rs8(prz->rs_decoder, data, par, len, | |
152 | NULL, 0, NULL, 0, NULL); | |
153 | } | |
c672528a | 154 | |
a15d0b36 | 155 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
808d0387 | 156 | unsigned int start, unsigned int count) |
c672528a CC |
157 | { |
158 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
159 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
160 | uint8_t *block; | |
161 | uint8_t *par; | |
c31ad081 AH |
162 | int ecc_block_size = prz->ecc_info.block_size; |
163 | int ecc_size = prz->ecc_info.ecc_size; | |
164 | int size = ecc_block_size; | |
9cc05ad9 | 165 | |
c31ad081 | 166 | if (!ecc_size) |
9cc05ad9 CC |
167 | return; |
168 | ||
808d0387 | 169 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
c31ad081 | 170 | par = prz->par_buffer + (start / ecc_block_size) * ecc_size; |
808d0387 | 171 | |
c672528a | 172 | do { |
9cc05ad9 | 173 | if (block + ecc_block_size > buffer_end) |
c672528a CC |
174 | size = buffer_end - block; |
175 | persistent_ram_encode_rs8(prz, block, size, par); | |
9cc05ad9 CC |
176 | block += ecc_block_size; |
177 | par += ecc_size; | |
808d0387 | 178 | } while (block < buffer->data + start + count); |
c672528a CC |
179 | } |
180 | ||
9cc05ad9 | 181 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
c672528a | 182 | { |
c672528a CC |
183 | struct persistent_ram_buffer *buffer = prz->buffer; |
184 | ||
c31ad081 | 185 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
186 | return; |
187 | ||
c672528a CC |
188 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
189 | prz->par_header); | |
c672528a CC |
190 | } |
191 | ||
9cc05ad9 | 192 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
c672528a CC |
193 | { |
194 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
195 | uint8_t *block; |
196 | uint8_t *par; | |
197 | ||
c31ad081 | 198 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
199 | return; |
200 | ||
c672528a CC |
201 | block = buffer->data; |
202 | par = prz->par_buffer; | |
808d0387 | 203 | while (block < buffer->data + buffer_size(prz)) { |
c672528a | 204 | int numerr; |
c31ad081 | 205 | int size = prz->ecc_info.block_size; |
c672528a CC |
206 | if (block + size > buffer->data + prz->buffer_size) |
207 | size = buffer->data + prz->buffer_size - block; | |
208 | numerr = persistent_ram_decode_rs8(prz, block, size, par); | |
209 | if (numerr > 0) { | |
ef748853 | 210 | pr_devel("error in block %p, %d\n", block, numerr); |
c672528a CC |
211 | prz->corrected_bytes += numerr; |
212 | } else if (numerr < 0) { | |
ef748853 | 213 | pr_devel("uncorrectable error in block %p\n", block); |
c672528a CC |
214 | prz->bad_blocks++; |
215 | } | |
c31ad081 AH |
216 | block += prz->ecc_info.block_size; |
217 | par += prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
218 | } |
219 | } | |
220 | ||
5ca5d4e6 | 221 | static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, |
c31ad081 | 222 | struct persistent_ram_ecc_info *ecc_info) |
9cc05ad9 CC |
223 | { |
224 | int numerr; | |
225 | struct persistent_ram_buffer *buffer = prz->buffer; | |
226 | int ecc_blocks; | |
1e6a9e56 | 227 | size_t ecc_total; |
9cc05ad9 | 228 | |
c31ad081 | 229 | if (!ecc_info || !ecc_info->ecc_size) |
9cc05ad9 CC |
230 | return 0; |
231 | ||
c31ad081 AH |
232 | prz->ecc_info.block_size = ecc_info->block_size ?: 128; |
233 | prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16; | |
234 | prz->ecc_info.symsize = ecc_info->symsize ?: 8; | |
235 | prz->ecc_info.poly = ecc_info->poly ?: 0x11d; | |
9cc05ad9 | 236 | |
c31ad081 AH |
237 | ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size, |
238 | prz->ecc_info.block_size + | |
239 | prz->ecc_info.ecc_size); | |
240 | ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size; | |
1e6a9e56 AV |
241 | if (ecc_total >= prz->buffer_size) { |
242 | pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n", | |
c31ad081 AH |
243 | __func__, prz->ecc_info.ecc_size, |
244 | ecc_total, prz->buffer_size); | |
9cc05ad9 CC |
245 | return -EINVAL; |
246 | } | |
247 | ||
1e6a9e56 | 248 | prz->buffer_size -= ecc_total; |
9cc05ad9 | 249 | prz->par_buffer = buffer->data + prz->buffer_size; |
c31ad081 AH |
250 | prz->par_header = prz->par_buffer + |
251 | ecc_blocks * prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
252 | |
253 | /* | |
254 | * first consecutive root is 0 | |
255 | * primitive element to generate roots = 1 | |
256 | */ | |
c31ad081 AH |
257 | prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly, |
258 | 0, 1, prz->ecc_info.ecc_size); | |
9cc05ad9 | 259 | if (prz->rs_decoder == NULL) { |
ef748853 | 260 | pr_info("init_rs failed\n"); |
9cc05ad9 | 261 | return -EINVAL; |
c672528a | 262 | } |
9cc05ad9 CC |
263 | |
264 | prz->corrected_bytes = 0; | |
265 | prz->bad_blocks = 0; | |
266 | ||
267 | numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer), | |
268 | prz->par_header); | |
269 | if (numerr > 0) { | |
ef748853 | 270 | pr_info("error in header, %d\n", numerr); |
9cc05ad9 CC |
271 | prz->corrected_bytes += numerr; |
272 | } else if (numerr < 0) { | |
ef748853 | 273 | pr_info("uncorrectable error in header\n"); |
9cc05ad9 CC |
274 | prz->bad_blocks++; |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, | |
281 | char *str, size_t len) | |
282 | { | |
283 | ssize_t ret; | |
284 | ||
bd08ec33 AH |
285 | if (!prz->ecc_info.ecc_size) |
286 | return 0; | |
287 | ||
9cc05ad9 CC |
288 | if (prz->corrected_bytes || prz->bad_blocks) |
289 | ret = snprintf(str, len, "" | |
290 | "\n%d Corrected bytes, %d unrecoverable blocks\n", | |
291 | prz->corrected_bytes, prz->bad_blocks); | |
292 | else | |
293 | ret = snprintf(str, len, "\nNo errors detected\n"); | |
294 | ||
295 | return ret; | |
296 | } | |
297 | ||
a15d0b36 | 298 | static void notrace persistent_ram_update(struct persistent_ram_zone *prz, |
808d0387 | 299 | const void *s, unsigned int start, unsigned int count) |
9cc05ad9 CC |
300 | { |
301 | struct persistent_ram_buffer *buffer = prz->buffer; | |
808d0387 CC |
302 | memcpy(buffer->data + start, s, count); |
303 | persistent_ram_update_ecc(prz, start, count); | |
9cc05ad9 CC |
304 | } |
305 | ||
201e4aca | 306 | void persistent_ram_save_old(struct persistent_ram_zone *prz) |
9cc05ad9 CC |
307 | { |
308 | struct persistent_ram_buffer *buffer = prz->buffer; | |
808d0387 CC |
309 | size_t size = buffer_size(prz); |
310 | size_t start = buffer_start(prz); | |
9cc05ad9 | 311 | |
201e4aca AV |
312 | if (!size) |
313 | return; | |
c672528a | 314 | |
201e4aca AV |
315 | if (!prz->old_log) { |
316 | persistent_ram_ecc_old(prz); | |
317 | prz->old_log = kmalloc(size, GFP_KERNEL); | |
318 | } | |
319 | if (!prz->old_log) { | |
ef748853 | 320 | pr_err("failed to allocate buffer\n"); |
c672528a CC |
321 | return; |
322 | } | |
323 | ||
808d0387 CC |
324 | prz->old_log_size = size; |
325 | memcpy(prz->old_log, &buffer->data[start], size - start); | |
326 | memcpy(prz->old_log + size - start, &buffer->data[0], start); | |
c672528a CC |
327 | } |
328 | ||
a15d0b36 | 329 | int notrace persistent_ram_write(struct persistent_ram_zone *prz, |
c672528a CC |
330 | const void *s, unsigned int count) |
331 | { | |
332 | int rem; | |
333 | int c = count; | |
808d0387 | 334 | size_t start; |
c672528a | 335 | |
808d0387 | 336 | if (unlikely(c > prz->buffer_size)) { |
c672528a CC |
337 | s += c - prz->buffer_size; |
338 | c = prz->buffer_size; | |
339 | } | |
808d0387 | 340 | |
484dd30e | 341 | buffer_size_add(prz, c); |
808d0387 CC |
342 | |
343 | start = buffer_start_add(prz, c); | |
344 | ||
345 | rem = prz->buffer_size - start; | |
346 | if (unlikely(rem < c)) { | |
347 | persistent_ram_update(prz, s, start, rem); | |
c672528a CC |
348 | s += rem; |
349 | c -= rem; | |
808d0387 | 350 | start = 0; |
c672528a | 351 | } |
808d0387 | 352 | persistent_ram_update(prz, s, start, c); |
c672528a | 353 | |
9cc05ad9 | 354 | persistent_ram_update_header_ecc(prz); |
c672528a CC |
355 | |
356 | return count; | |
357 | } | |
358 | ||
c672528a CC |
359 | size_t persistent_ram_old_size(struct persistent_ram_zone *prz) |
360 | { | |
361 | return prz->old_log_size; | |
362 | } | |
363 | ||
364 | void *persistent_ram_old(struct persistent_ram_zone *prz) | |
365 | { | |
366 | return prz->old_log; | |
367 | } | |
368 | ||
369 | void persistent_ram_free_old(struct persistent_ram_zone *prz) | |
370 | { | |
371 | kfree(prz->old_log); | |
372 | prz->old_log = NULL; | |
373 | prz->old_log_size = 0; | |
374 | } | |
375 | ||
fce39793 AV |
376 | void persistent_ram_zap(struct persistent_ram_zone *prz) |
377 | { | |
378 | atomic_set(&prz->buffer->start, 0); | |
379 | atomic_set(&prz->buffer->size, 0); | |
380 | persistent_ram_update_header_ecc(prz); | |
381 | } | |
382 | ||
027bc8b0 TL |
383 | static void *persistent_ram_vmap(phys_addr_t start, size_t size, |
384 | unsigned int memtype) | |
c672528a | 385 | { |
404a6043 CC |
386 | struct page **pages; |
387 | phys_addr_t page_start; | |
388 | unsigned int page_count; | |
389 | pgprot_t prot; | |
390 | unsigned int i; | |
2b1321e4 | 391 | void *vaddr; |
404a6043 CC |
392 | |
393 | page_start = start - offset_in_page(start); | |
394 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); | |
395 | ||
027bc8b0 TL |
396 | if (memtype) |
397 | prot = pgprot_noncached(PAGE_KERNEL); | |
398 | else | |
399 | prot = pgprot_writecombine(PAGE_KERNEL); | |
404a6043 | 400 | |
b8f52d89 | 401 | pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL); |
404a6043 | 402 | if (!pages) { |
ef748853 FF |
403 | pr_err("%s: Failed to allocate array for %u pages\n", |
404 | __func__, page_count); | |
2b1321e4 | 405 | return NULL; |
404a6043 CC |
406 | } |
407 | ||
408 | for (i = 0; i < page_count; i++) { | |
409 | phys_addr_t addr = page_start + i * PAGE_SIZE; | |
410 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); | |
411 | } | |
2b1321e4 | 412 | vaddr = vmap(pages, page_count, VM_MAP, prot); |
404a6043 | 413 | kfree(pages); |
2b1321e4 AV |
414 | |
415 | return vaddr; | |
416 | } | |
417 | ||
027bc8b0 TL |
418 | static void *persistent_ram_iomap(phys_addr_t start, size_t size, |
419 | unsigned int memtype) | |
24c3d2f3 | 420 | { |
027bc8b0 TL |
421 | void *va; |
422 | ||
24c3d2f3 AV |
423 | if (!request_mem_region(start, size, "persistent_ram")) { |
424 | pr_err("request mem region (0x%llx@0x%llx) failed\n", | |
425 | (unsigned long long)size, (unsigned long long)start); | |
426 | return NULL; | |
427 | } | |
428 | ||
0405a5ce RH |
429 | buffer_start_add = buffer_start_add_locked; |
430 | buffer_size_add = buffer_size_add_locked; | |
431 | ||
027bc8b0 TL |
432 | if (memtype) |
433 | va = ioremap(start, size); | |
434 | else | |
435 | va = ioremap_wc(start, size); | |
436 | ||
437 | return va; | |
24c3d2f3 AV |
438 | } |
439 | ||
2b1321e4 | 440 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
027bc8b0 | 441 | struct persistent_ram_zone *prz, int memtype) |
2b1321e4 | 442 | { |
d3b48769 AV |
443 | prz->paddr = start; |
444 | prz->size = size; | |
445 | ||
24c3d2f3 | 446 | if (pfn_valid(start >> PAGE_SHIFT)) |
027bc8b0 | 447 | prz->vaddr = persistent_ram_vmap(start, size, memtype); |
24c3d2f3 | 448 | else |
027bc8b0 | 449 | prz->vaddr = persistent_ram_iomap(start, size, memtype); |
24c3d2f3 | 450 | |
404a6043 | 451 | if (!prz->vaddr) { |
2b1321e4 AV |
452 | pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__, |
453 | (unsigned long long)size, (unsigned long long)start); | |
404a6043 CC |
454 | return -ENOMEM; |
455 | } | |
456 | ||
457 | prz->buffer = prz->vaddr + offset_in_page(start); | |
458 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
f568f6ca | 463 | static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig, |
c31ad081 | 464 | struct persistent_ram_ecc_info *ecc_info) |
404a6043 | 465 | { |
bb4206f2 | 466 | int ret; |
c672528a | 467 | |
c31ad081 | 468 | ret = persistent_ram_init_ecc(prz, ecc_info); |
9cc05ad9 | 469 | if (ret) |
bb4206f2 | 470 | return ret; |
c672528a | 471 | |
cbe7cbf5 AV |
472 | sig ^= PERSISTENT_RAM_SIG; |
473 | ||
474 | if (prz->buffer->sig == sig) { | |
808d0387 CC |
475 | if (buffer_size(prz) > prz->buffer_size || |
476 | buffer_start(prz) > buffer_size(prz)) | |
ef748853 FF |
477 | pr_info("found existing invalid buffer, size %zu, start %zu\n", |
478 | buffer_size(prz), buffer_start(prz)); | |
c672528a | 479 | else { |
ef748853 FF |
480 | pr_debug("found existing buffer, size %zu, start %zu\n", |
481 | buffer_size(prz), buffer_start(prz)); | |
c672528a | 482 | persistent_ram_save_old(prz); |
25b63da6 | 483 | return 0; |
c672528a CC |
484 | } |
485 | } else { | |
ef748853 FF |
486 | pr_debug("no valid data in buffer (sig = 0x%08x)\n", |
487 | prz->buffer->sig); | |
c672528a CC |
488 | } |
489 | ||
cbe7cbf5 | 490 | prz->buffer->sig = sig; |
fce39793 | 491 | persistent_ram_zap(prz); |
c672528a | 492 | |
bb4206f2 AV |
493 | return 0; |
494 | } | |
495 | ||
d3b48769 AV |
496 | void persistent_ram_free(struct persistent_ram_zone *prz) |
497 | { | |
beeb9432 AV |
498 | if (!prz) |
499 | return; | |
500 | ||
501 | if (prz->vaddr) { | |
502 | if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { | |
503 | vunmap(prz->vaddr); | |
504 | } else { | |
505 | iounmap(prz->vaddr); | |
506 | release_mem_region(prz->paddr, prz->size); | |
507 | } | |
508 | prz->vaddr = NULL; | |
d3b48769 AV |
509 | } |
510 | persistent_ram_free_old(prz); | |
511 | kfree(prz); | |
512 | } | |
513 | ||
f568f6ca | 514 | struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, |
027bc8b0 TL |
515 | u32 sig, struct persistent_ram_ecc_info *ecc_info, |
516 | unsigned int memtype) | |
8cf5aff8 AV |
517 | { |
518 | struct persistent_ram_zone *prz; | |
519 | int ret = -ENOMEM; | |
520 | ||
521 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); | |
522 | if (!prz) { | |
ef748853 | 523 | pr_err("failed to allocate persistent ram zone\n"); |
8cf5aff8 AV |
524 | goto err; |
525 | } | |
526 | ||
027bc8b0 | 527 | ret = persistent_ram_buffer_map(start, size, prz, memtype); |
8cf5aff8 AV |
528 | if (ret) |
529 | goto err; | |
530 | ||
c31ad081 | 531 | ret = persistent_ram_post_init(prz, sig, ecc_info); |
beeb9432 AV |
532 | if (ret) |
533 | goto err; | |
8cf5aff8 AV |
534 | |
535 | return prz; | |
536 | err: | |
beeb9432 | 537 | persistent_ram_free(prz); |
8cf5aff8 AV |
538 | return ERR_PTR(ret); |
539 | } |