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 | ||
404a6043 CC |
15 | #include <linux/device.h> |
16 | #include <linux/err.h> | |
c672528a CC |
17 | #include <linux/errno.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/io.h> | |
404a6043 CC |
21 | #include <linux/list.h> |
22 | #include <linux/memblock.h> | |
9cc05ad9 | 23 | #include <linux/rslib.h> |
c672528a | 24 | #include <linux/slab.h> |
404a6043 | 25 | #include <linux/vmalloc.h> |
cddb8751 | 26 | #include <linux/pstore_ram.h> |
24c3d2f3 | 27 | #include <asm/page.h> |
c672528a | 28 | |
c672528a CC |
29 | struct persistent_ram_buffer { |
30 | uint32_t sig; | |
808d0387 CC |
31 | atomic_t start; |
32 | atomic_t size; | |
c672528a CC |
33 | uint8_t data[0]; |
34 | }; | |
35 | ||
36 | #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */ | |
37 | ||
808d0387 CC |
38 | static inline size_t buffer_size(struct persistent_ram_zone *prz) |
39 | { | |
40 | return atomic_read(&prz->buffer->size); | |
41 | } | |
42 | ||
43 | static inline size_t buffer_start(struct persistent_ram_zone *prz) | |
44 | { | |
45 | return atomic_read(&prz->buffer->start); | |
46 | } | |
47 | ||
48 | /* increase and wrap the start pointer, returning the old value */ | |
0405a5ce | 49 | static size_t buffer_start_add_atomic(struct persistent_ram_zone *prz, size_t a) |
808d0387 CC |
50 | { |
51 | int old; | |
52 | int new; | |
53 | ||
54 | do { | |
55 | old = atomic_read(&prz->buffer->start); | |
56 | new = old + a; | |
57 | while (unlikely(new > prz->buffer_size)) | |
58 | new -= prz->buffer_size; | |
59 | } while (atomic_cmpxchg(&prz->buffer->start, old, new) != old); | |
60 | ||
61 | return old; | |
62 | } | |
63 | ||
64 | /* increase the size counter until it hits the max size */ | |
0405a5ce | 65 | static void buffer_size_add_atomic(struct persistent_ram_zone *prz, size_t a) |
808d0387 CC |
66 | { |
67 | size_t old; | |
68 | size_t new; | |
69 | ||
70 | if (atomic_read(&prz->buffer->size) == prz->buffer_size) | |
71 | return; | |
72 | ||
73 | do { | |
74 | old = atomic_read(&prz->buffer->size); | |
75 | new = old + a; | |
76 | if (new > prz->buffer_size) | |
77 | new = prz->buffer_size; | |
78 | } while (atomic_cmpxchg(&prz->buffer->size, old, new) != old); | |
79 | } | |
80 | ||
0405a5ce RH |
81 | static DEFINE_RAW_SPINLOCK(buffer_lock); |
82 | ||
83 | /* increase and wrap the start pointer, returning the old value */ | |
84 | static size_t buffer_start_add_locked(struct persistent_ram_zone *prz, size_t a) | |
85 | { | |
86 | int old; | |
87 | int new; | |
88 | unsigned long flags; | |
89 | ||
90 | raw_spin_lock_irqsave(&buffer_lock, flags); | |
91 | ||
92 | old = atomic_read(&prz->buffer->start); | |
93 | new = old + a; | |
94 | while (unlikely(new > prz->buffer_size)) | |
95 | new -= prz->buffer_size; | |
96 | atomic_set(&prz->buffer->start, new); | |
97 | ||
98 | raw_spin_unlock_irqrestore(&buffer_lock, flags); | |
99 | ||
100 | return old; | |
101 | } | |
102 | ||
103 | /* increase the size counter until it hits the max size */ | |
104 | static void buffer_size_add_locked(struct persistent_ram_zone *prz, size_t a) | |
105 | { | |
106 | size_t old; | |
107 | size_t new; | |
108 | unsigned long flags; | |
109 | ||
110 | raw_spin_lock_irqsave(&buffer_lock, flags); | |
111 | ||
112 | old = atomic_read(&prz->buffer->size); | |
113 | if (old == prz->buffer_size) | |
114 | goto exit; | |
115 | ||
116 | new = old + a; | |
117 | if (new > prz->buffer_size) | |
118 | new = prz->buffer_size; | |
119 | atomic_set(&prz->buffer->size, new); | |
120 | ||
121 | exit: | |
122 | raw_spin_unlock_irqrestore(&buffer_lock, flags); | |
123 | } | |
124 | ||
125 | static size_t (*buffer_start_add)(struct persistent_ram_zone *, size_t) = buffer_start_add_atomic; | |
126 | static void (*buffer_size_add)(struct persistent_ram_zone *, size_t) = buffer_size_add_atomic; | |
127 | ||
a15d0b36 | 128 | static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, |
c672528a CC |
129 | uint8_t *data, size_t len, uint8_t *ecc) |
130 | { | |
131 | int i; | |
c31ad081 | 132 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 133 | |
c672528a CC |
134 | /* Initialize the parity buffer */ |
135 | memset(par, 0, sizeof(par)); | |
136 | encode_rs8(prz->rs_decoder, data, len, par, 0); | |
c31ad081 | 137 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
138 | ecc[i] = par[i]; |
139 | } | |
140 | ||
141 | static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, | |
142 | void *data, size_t len, uint8_t *ecc) | |
143 | { | |
144 | int i; | |
c31ad081 | 145 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 146 | |
c31ad081 | 147 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
148 | par[i] = ecc[i]; |
149 | return decode_rs8(prz->rs_decoder, data, par, len, | |
150 | NULL, 0, NULL, 0, NULL); | |
151 | } | |
c672528a | 152 | |
a15d0b36 | 153 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
808d0387 | 154 | unsigned int start, unsigned int count) |
c672528a CC |
155 | { |
156 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
157 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
158 | uint8_t *block; | |
159 | uint8_t *par; | |
c31ad081 AH |
160 | int ecc_block_size = prz->ecc_info.block_size; |
161 | int ecc_size = prz->ecc_info.ecc_size; | |
162 | int size = ecc_block_size; | |
9cc05ad9 | 163 | |
c31ad081 | 164 | if (!ecc_size) |
9cc05ad9 CC |
165 | return; |
166 | ||
808d0387 | 167 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
c31ad081 | 168 | par = prz->par_buffer + (start / ecc_block_size) * ecc_size; |
808d0387 | 169 | |
c672528a | 170 | do { |
9cc05ad9 | 171 | if (block + ecc_block_size > buffer_end) |
c672528a CC |
172 | size = buffer_end - block; |
173 | persistent_ram_encode_rs8(prz, block, size, par); | |
9cc05ad9 CC |
174 | block += ecc_block_size; |
175 | par += ecc_size; | |
808d0387 | 176 | } while (block < buffer->data + start + count); |
c672528a CC |
177 | } |
178 | ||
9cc05ad9 | 179 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
c672528a | 180 | { |
c672528a CC |
181 | struct persistent_ram_buffer *buffer = prz->buffer; |
182 | ||
c31ad081 | 183 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
184 | return; |
185 | ||
c672528a CC |
186 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
187 | prz->par_header); | |
c672528a CC |
188 | } |
189 | ||
9cc05ad9 | 190 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
c672528a CC |
191 | { |
192 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
193 | uint8_t *block; |
194 | uint8_t *par; | |
195 | ||
c31ad081 | 196 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
197 | return; |
198 | ||
c672528a CC |
199 | block = buffer->data; |
200 | par = prz->par_buffer; | |
808d0387 | 201 | while (block < buffer->data + buffer_size(prz)) { |
c672528a | 202 | int numerr; |
c31ad081 | 203 | int size = prz->ecc_info.block_size; |
c672528a CC |
204 | if (block + size > buffer->data + prz->buffer_size) |
205 | size = buffer->data + prz->buffer_size - block; | |
206 | numerr = persistent_ram_decode_rs8(prz, block, size, par); | |
207 | if (numerr > 0) { | |
9cc05ad9 | 208 | pr_devel("persistent_ram: error in block %p, %d\n", |
c672528a | 209 | block, numerr); |
c672528a CC |
210 | prz->corrected_bytes += numerr; |
211 | } else if (numerr < 0) { | |
9cc05ad9 | 212 | pr_devel("persistent_ram: uncorrectable error in block %p\n", |
c672528a | 213 | 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 CC |
259 | if (prz->rs_decoder == NULL) { |
260 | pr_info("persistent_ram: init_rs failed\n"); | |
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) { | |
270 | pr_info("persistent_ram: error in header, %d\n", numerr); | |
271 | prz->corrected_bytes += numerr; | |
272 | } else if (numerr < 0) { | |
273 | pr_info("persistent_ram: uncorrectable error in header\n"); | |
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) { | |
c672528a CC |
320 | pr_err("persistent_ram: failed to allocate buffer\n"); |
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 | ||
2b1321e4 | 383 | static void *persistent_ram_vmap(phys_addr_t start, size_t size) |
c672528a | 384 | { |
404a6043 CC |
385 | struct page **pages; |
386 | phys_addr_t page_start; | |
387 | unsigned int page_count; | |
388 | pgprot_t prot; | |
389 | unsigned int i; | |
2b1321e4 | 390 | void *vaddr; |
404a6043 CC |
391 | |
392 | page_start = start - offset_in_page(start); | |
393 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); | |
394 | ||
395 | prot = pgprot_noncached(PAGE_KERNEL); | |
396 | ||
397 | pages = kmalloc(sizeof(struct page *) * page_count, GFP_KERNEL); | |
398 | if (!pages) { | |
399 | pr_err("%s: Failed to allocate array for %u pages\n", __func__, | |
400 | page_count); | |
2b1321e4 | 401 | return NULL; |
404a6043 CC |
402 | } |
403 | ||
404 | for (i = 0; i < page_count; i++) { | |
405 | phys_addr_t addr = page_start + i * PAGE_SIZE; | |
406 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); | |
407 | } | |
2b1321e4 | 408 | vaddr = vmap(pages, page_count, VM_MAP, prot); |
404a6043 | 409 | kfree(pages); |
2b1321e4 AV |
410 | |
411 | return vaddr; | |
412 | } | |
413 | ||
24c3d2f3 AV |
414 | static void *persistent_ram_iomap(phys_addr_t start, size_t size) |
415 | { | |
416 | if (!request_mem_region(start, size, "persistent_ram")) { | |
417 | pr_err("request mem region (0x%llx@0x%llx) failed\n", | |
418 | (unsigned long long)size, (unsigned long long)start); | |
419 | return NULL; | |
420 | } | |
421 | ||
0405a5ce RH |
422 | buffer_start_add = buffer_start_add_locked; |
423 | buffer_size_add = buffer_size_add_locked; | |
424 | ||
24c3d2f3 AV |
425 | return ioremap(start, size); |
426 | } | |
427 | ||
2b1321e4 AV |
428 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
429 | struct persistent_ram_zone *prz) | |
430 | { | |
d3b48769 AV |
431 | prz->paddr = start; |
432 | prz->size = size; | |
433 | ||
24c3d2f3 AV |
434 | if (pfn_valid(start >> PAGE_SHIFT)) |
435 | prz->vaddr = persistent_ram_vmap(start, size); | |
436 | else | |
437 | prz->vaddr = persistent_ram_iomap(start, size); | |
438 | ||
404a6043 | 439 | if (!prz->vaddr) { |
2b1321e4 AV |
440 | pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__, |
441 | (unsigned long long)size, (unsigned long long)start); | |
404a6043 CC |
442 | return -ENOMEM; |
443 | } | |
444 | ||
445 | prz->buffer = prz->vaddr + offset_in_page(start); | |
446 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
f568f6ca | 451 | static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig, |
c31ad081 | 452 | struct persistent_ram_ecc_info *ecc_info) |
404a6043 | 453 | { |
bb4206f2 | 454 | int ret; |
c672528a | 455 | |
c31ad081 | 456 | ret = persistent_ram_init_ecc(prz, ecc_info); |
9cc05ad9 | 457 | if (ret) |
bb4206f2 | 458 | return ret; |
c672528a | 459 | |
cbe7cbf5 AV |
460 | sig ^= PERSISTENT_RAM_SIG; |
461 | ||
462 | if (prz->buffer->sig == sig) { | |
808d0387 CC |
463 | if (buffer_size(prz) > prz->buffer_size || |
464 | buffer_start(prz) > buffer_size(prz)) | |
465 | pr_info("persistent_ram: found existing invalid buffer," | |
f56d711b | 466 | " size %zu, start %zu\n", |
808d0387 | 467 | buffer_size(prz), buffer_start(prz)); |
c672528a | 468 | else { |
602b5be4 | 469 | pr_debug("persistent_ram: found existing buffer," |
f56d711b | 470 | " size %zu, start %zu\n", |
808d0387 | 471 | buffer_size(prz), buffer_start(prz)); |
c672528a | 472 | persistent_ram_save_old(prz); |
25b63da6 | 473 | return 0; |
c672528a CC |
474 | } |
475 | } else { | |
602b5be4 | 476 | pr_debug("persistent_ram: no valid data in buffer" |
808d0387 | 477 | " (sig = 0x%08x)\n", prz->buffer->sig); |
c672528a CC |
478 | } |
479 | ||
cbe7cbf5 | 480 | prz->buffer->sig = sig; |
fce39793 | 481 | persistent_ram_zap(prz); |
c672528a | 482 | |
bb4206f2 AV |
483 | return 0; |
484 | } | |
485 | ||
d3b48769 AV |
486 | void persistent_ram_free(struct persistent_ram_zone *prz) |
487 | { | |
beeb9432 AV |
488 | if (!prz) |
489 | return; | |
490 | ||
491 | if (prz->vaddr) { | |
492 | if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { | |
493 | vunmap(prz->vaddr); | |
494 | } else { | |
495 | iounmap(prz->vaddr); | |
496 | release_mem_region(prz->paddr, prz->size); | |
497 | } | |
498 | prz->vaddr = NULL; | |
d3b48769 AV |
499 | } |
500 | persistent_ram_free_old(prz); | |
501 | kfree(prz); | |
502 | } | |
503 | ||
f568f6ca | 504 | struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, |
c31ad081 | 505 | u32 sig, struct persistent_ram_ecc_info *ecc_info) |
8cf5aff8 AV |
506 | { |
507 | struct persistent_ram_zone *prz; | |
508 | int ret = -ENOMEM; | |
509 | ||
510 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); | |
511 | if (!prz) { | |
512 | pr_err("persistent_ram: failed to allocate persistent ram zone\n"); | |
513 | goto err; | |
514 | } | |
515 | ||
516 | ret = persistent_ram_buffer_map(start, size, prz); | |
517 | if (ret) | |
518 | goto err; | |
519 | ||
c31ad081 | 520 | ret = persistent_ram_post_init(prz, sig, ecc_info); |
beeb9432 AV |
521 | if (ret) |
522 | goto err; | |
8cf5aff8 AV |
523 | |
524 | return prz; | |
525 | err: | |
beeb9432 | 526 | persistent_ram_free(prz); |
8cf5aff8 AV |
527 | return ERR_PTR(ret); |
528 | } |