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 | 19 | #include <linux/errno.h> |
c672528a CC |
20 | #include <linux/init.h> |
21 | #include <linux/io.h> | |
5bf6d1b9 | 22 | #include <linux/kernel.h> |
404a6043 CC |
23 | #include <linux/list.h> |
24 | #include <linux/memblock.h> | |
5bf6d1b9 | 25 | #include <linux/pstore_ram.h> |
9cc05ad9 | 26 | #include <linux/rslib.h> |
c672528a | 27 | #include <linux/slab.h> |
5bf6d1b9 | 28 | #include <linux/uaccess.h> |
404a6043 | 29 | #include <linux/vmalloc.h> |
24c3d2f3 | 30 | #include <asm/page.h> |
c672528a | 31 | |
c672528a CC |
32 | struct persistent_ram_buffer { |
33 | uint32_t sig; | |
808d0387 CC |
34 | atomic_t start; |
35 | atomic_t size; | |
c672528a CC |
36 | uint8_t data[0]; |
37 | }; | |
38 | ||
39 | #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */ | |
40 | ||
808d0387 CC |
41 | static inline size_t buffer_size(struct persistent_ram_zone *prz) |
42 | { | |
43 | return atomic_read(&prz->buffer->size); | |
44 | } | |
45 | ||
46 | static inline size_t buffer_start(struct persistent_ram_zone *prz) | |
47 | { | |
48 | return atomic_read(&prz->buffer->start); | |
49 | } | |
50 | ||
0405a5ce RH |
51 | static DEFINE_RAW_SPINLOCK(buffer_lock); |
52 | ||
53 | /* increase and wrap the start pointer, returning the old value */ | |
d5a9bf0b | 54 | static size_t buffer_start_add(struct persistent_ram_zone *prz, size_t a) |
0405a5ce RH |
55 | { |
56 | int old; | |
57 | int new; | |
58 | unsigned long flags; | |
59 | ||
60 | raw_spin_lock_irqsave(&buffer_lock, flags); | |
61 | ||
62 | old = atomic_read(&prz->buffer->start); | |
63 | new = old + a; | |
017321cf | 64 | while (unlikely(new >= prz->buffer_size)) |
0405a5ce RH |
65 | new -= prz->buffer_size; |
66 | atomic_set(&prz->buffer->start, new); | |
67 | ||
68 | raw_spin_unlock_irqrestore(&buffer_lock, flags); | |
69 | ||
70 | return old; | |
71 | } | |
72 | ||
73 | /* increase the size counter until it hits the max size */ | |
d5a9bf0b | 74 | static void buffer_size_add(struct persistent_ram_zone *prz, size_t a) |
0405a5ce RH |
75 | { |
76 | size_t old; | |
77 | size_t new; | |
78 | unsigned long flags; | |
79 | ||
80 | raw_spin_lock_irqsave(&buffer_lock, flags); | |
81 | ||
82 | old = atomic_read(&prz->buffer->size); | |
83 | if (old == prz->buffer_size) | |
84 | goto exit; | |
85 | ||
86 | new = old + a; | |
87 | if (new > prz->buffer_size) | |
88 | new = prz->buffer_size; | |
89 | atomic_set(&prz->buffer->size, new); | |
90 | ||
91 | exit: | |
92 | raw_spin_unlock_irqrestore(&buffer_lock, flags); | |
93 | } | |
94 | ||
a15d0b36 | 95 | static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, |
c672528a CC |
96 | uint8_t *data, size_t len, uint8_t *ecc) |
97 | { | |
98 | int i; | |
c31ad081 | 99 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 100 | |
c672528a CC |
101 | /* Initialize the parity buffer */ |
102 | memset(par, 0, sizeof(par)); | |
103 | encode_rs8(prz->rs_decoder, data, len, par, 0); | |
c31ad081 | 104 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
105 | ecc[i] = par[i]; |
106 | } | |
107 | ||
108 | static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, | |
109 | void *data, size_t len, uint8_t *ecc) | |
110 | { | |
111 | int i; | |
c31ad081 | 112 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 113 | |
c31ad081 | 114 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
115 | par[i] = ecc[i]; |
116 | return decode_rs8(prz->rs_decoder, data, par, len, | |
117 | NULL, 0, NULL, 0, NULL); | |
118 | } | |
c672528a | 119 | |
a15d0b36 | 120 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
808d0387 | 121 | unsigned int start, unsigned int count) |
c672528a CC |
122 | { |
123 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
124 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
125 | uint8_t *block; | |
126 | uint8_t *par; | |
c31ad081 AH |
127 | int ecc_block_size = prz->ecc_info.block_size; |
128 | int ecc_size = prz->ecc_info.ecc_size; | |
129 | int size = ecc_block_size; | |
9cc05ad9 | 130 | |
c31ad081 | 131 | if (!ecc_size) |
9cc05ad9 CC |
132 | return; |
133 | ||
808d0387 | 134 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
c31ad081 | 135 | par = prz->par_buffer + (start / ecc_block_size) * ecc_size; |
808d0387 | 136 | |
c672528a | 137 | do { |
9cc05ad9 | 138 | if (block + ecc_block_size > buffer_end) |
c672528a CC |
139 | size = buffer_end - block; |
140 | persistent_ram_encode_rs8(prz, block, size, par); | |
9cc05ad9 CC |
141 | block += ecc_block_size; |
142 | par += ecc_size; | |
808d0387 | 143 | } while (block < buffer->data + start + count); |
c672528a CC |
144 | } |
145 | ||
9cc05ad9 | 146 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
c672528a | 147 | { |
c672528a CC |
148 | struct persistent_ram_buffer *buffer = prz->buffer; |
149 | ||
c31ad081 | 150 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
151 | return; |
152 | ||
c672528a CC |
153 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
154 | prz->par_header); | |
c672528a CC |
155 | } |
156 | ||
9cc05ad9 | 157 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
c672528a CC |
158 | { |
159 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
160 | uint8_t *block; |
161 | uint8_t *par; | |
162 | ||
c31ad081 | 163 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
164 | return; |
165 | ||
c672528a CC |
166 | block = buffer->data; |
167 | par = prz->par_buffer; | |
808d0387 | 168 | while (block < buffer->data + buffer_size(prz)) { |
c672528a | 169 | int numerr; |
c31ad081 | 170 | int size = prz->ecc_info.block_size; |
c672528a CC |
171 | if (block + size > buffer->data + prz->buffer_size) |
172 | size = buffer->data + prz->buffer_size - block; | |
173 | numerr = persistent_ram_decode_rs8(prz, block, size, par); | |
174 | if (numerr > 0) { | |
ef748853 | 175 | pr_devel("error in block %p, %d\n", block, numerr); |
c672528a CC |
176 | prz->corrected_bytes += numerr; |
177 | } else if (numerr < 0) { | |
ef748853 | 178 | pr_devel("uncorrectable error in block %p\n", block); |
c672528a CC |
179 | prz->bad_blocks++; |
180 | } | |
c31ad081 AH |
181 | block += prz->ecc_info.block_size; |
182 | par += prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
183 | } |
184 | } | |
185 | ||
5ca5d4e6 | 186 | static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, |
c31ad081 | 187 | struct persistent_ram_ecc_info *ecc_info) |
9cc05ad9 CC |
188 | { |
189 | int numerr; | |
190 | struct persistent_ram_buffer *buffer = prz->buffer; | |
191 | int ecc_blocks; | |
1e6a9e56 | 192 | size_t ecc_total; |
9cc05ad9 | 193 | |
c31ad081 | 194 | if (!ecc_info || !ecc_info->ecc_size) |
9cc05ad9 CC |
195 | return 0; |
196 | ||
c31ad081 AH |
197 | prz->ecc_info.block_size = ecc_info->block_size ?: 128; |
198 | prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16; | |
199 | prz->ecc_info.symsize = ecc_info->symsize ?: 8; | |
200 | prz->ecc_info.poly = ecc_info->poly ?: 0x11d; | |
9cc05ad9 | 201 | |
c31ad081 AH |
202 | ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size, |
203 | prz->ecc_info.block_size + | |
204 | prz->ecc_info.ecc_size); | |
205 | ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size; | |
1e6a9e56 AV |
206 | if (ecc_total >= prz->buffer_size) { |
207 | pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n", | |
c31ad081 AH |
208 | __func__, prz->ecc_info.ecc_size, |
209 | ecc_total, prz->buffer_size); | |
9cc05ad9 CC |
210 | return -EINVAL; |
211 | } | |
212 | ||
1e6a9e56 | 213 | prz->buffer_size -= ecc_total; |
9cc05ad9 | 214 | prz->par_buffer = buffer->data + prz->buffer_size; |
c31ad081 AH |
215 | prz->par_header = prz->par_buffer + |
216 | ecc_blocks * prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
217 | |
218 | /* | |
219 | * first consecutive root is 0 | |
220 | * primitive element to generate roots = 1 | |
221 | */ | |
c31ad081 AH |
222 | prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly, |
223 | 0, 1, prz->ecc_info.ecc_size); | |
9cc05ad9 | 224 | if (prz->rs_decoder == NULL) { |
ef748853 | 225 | pr_info("init_rs failed\n"); |
9cc05ad9 | 226 | return -EINVAL; |
c672528a | 227 | } |
9cc05ad9 CC |
228 | |
229 | prz->corrected_bytes = 0; | |
230 | prz->bad_blocks = 0; | |
231 | ||
232 | numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer), | |
233 | prz->par_header); | |
234 | if (numerr > 0) { | |
ef748853 | 235 | pr_info("error in header, %d\n", numerr); |
9cc05ad9 CC |
236 | prz->corrected_bytes += numerr; |
237 | } else if (numerr < 0) { | |
ef748853 | 238 | pr_info("uncorrectable error in header\n"); |
9cc05ad9 CC |
239 | prz->bad_blocks++; |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, | |
246 | char *str, size_t len) | |
247 | { | |
248 | ssize_t ret; | |
249 | ||
bd08ec33 AH |
250 | if (!prz->ecc_info.ecc_size) |
251 | return 0; | |
252 | ||
9cc05ad9 CC |
253 | if (prz->corrected_bytes || prz->bad_blocks) |
254 | ret = snprintf(str, len, "" | |
255 | "\n%d Corrected bytes, %d unrecoverable blocks\n", | |
256 | prz->corrected_bytes, prz->bad_blocks); | |
257 | else | |
258 | ret = snprintf(str, len, "\nNo errors detected\n"); | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
a15d0b36 | 263 | static void notrace persistent_ram_update(struct persistent_ram_zone *prz, |
808d0387 | 264 | const void *s, unsigned int start, unsigned int count) |
9cc05ad9 CC |
265 | { |
266 | struct persistent_ram_buffer *buffer = prz->buffer; | |
7e75678d | 267 | memcpy_toio(buffer->data + start, s, count); |
808d0387 | 268 | persistent_ram_update_ecc(prz, start, count); |
9cc05ad9 CC |
269 | } |
270 | ||
5bf6d1b9 MS |
271 | static int notrace persistent_ram_update_user(struct persistent_ram_zone *prz, |
272 | const void __user *s, unsigned int start, unsigned int count) | |
273 | { | |
274 | struct persistent_ram_buffer *buffer = prz->buffer; | |
275 | int ret = unlikely(__copy_from_user(buffer->data + start, s, count)) ? | |
276 | -EFAULT : 0; | |
277 | persistent_ram_update_ecc(prz, start, count); | |
278 | return ret; | |
279 | } | |
280 | ||
201e4aca | 281 | void persistent_ram_save_old(struct persistent_ram_zone *prz) |
9cc05ad9 CC |
282 | { |
283 | struct persistent_ram_buffer *buffer = prz->buffer; | |
808d0387 CC |
284 | size_t size = buffer_size(prz); |
285 | size_t start = buffer_start(prz); | |
9cc05ad9 | 286 | |
201e4aca AV |
287 | if (!size) |
288 | return; | |
c672528a | 289 | |
201e4aca AV |
290 | if (!prz->old_log) { |
291 | persistent_ram_ecc_old(prz); | |
292 | prz->old_log = kmalloc(size, GFP_KERNEL); | |
293 | } | |
294 | if (!prz->old_log) { | |
ef748853 | 295 | pr_err("failed to allocate buffer\n"); |
c672528a CC |
296 | return; |
297 | } | |
298 | ||
808d0387 | 299 | prz->old_log_size = size; |
d771fdf9 AB |
300 | memcpy_fromio(prz->old_log, &buffer->data[start], size - start); |
301 | memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start); | |
c672528a CC |
302 | } |
303 | ||
a15d0b36 | 304 | int notrace persistent_ram_write(struct persistent_ram_zone *prz, |
c672528a CC |
305 | const void *s, unsigned int count) |
306 | { | |
307 | int rem; | |
308 | int c = count; | |
808d0387 | 309 | size_t start; |
c672528a | 310 | |
808d0387 | 311 | if (unlikely(c > prz->buffer_size)) { |
c672528a CC |
312 | s += c - prz->buffer_size; |
313 | c = prz->buffer_size; | |
314 | } | |
808d0387 | 315 | |
484dd30e | 316 | buffer_size_add(prz, c); |
808d0387 CC |
317 | |
318 | start = buffer_start_add(prz, c); | |
319 | ||
320 | rem = prz->buffer_size - start; | |
321 | if (unlikely(rem < c)) { | |
322 | persistent_ram_update(prz, s, start, rem); | |
c672528a CC |
323 | s += rem; |
324 | c -= rem; | |
808d0387 | 325 | start = 0; |
c672528a | 326 | } |
808d0387 | 327 | persistent_ram_update(prz, s, start, c); |
c672528a | 328 | |
9cc05ad9 | 329 | persistent_ram_update_header_ecc(prz); |
c672528a CC |
330 | |
331 | return count; | |
332 | } | |
333 | ||
5bf6d1b9 MS |
334 | int notrace persistent_ram_write_user(struct persistent_ram_zone *prz, |
335 | const void __user *s, unsigned int count) | |
336 | { | |
337 | int rem, ret = 0, c = count; | |
338 | size_t start; | |
339 | ||
340 | if (unlikely(!access_ok(VERIFY_READ, s, count))) | |
341 | return -EFAULT; | |
342 | if (unlikely(c > prz->buffer_size)) { | |
343 | s += c - prz->buffer_size; | |
344 | c = prz->buffer_size; | |
345 | } | |
346 | ||
347 | buffer_size_add(prz, c); | |
348 | ||
349 | start = buffer_start_add(prz, c); | |
350 | ||
351 | rem = prz->buffer_size - start; | |
352 | if (unlikely(rem < c)) { | |
353 | ret = persistent_ram_update_user(prz, s, start, rem); | |
354 | s += rem; | |
355 | c -= rem; | |
356 | start = 0; | |
357 | } | |
358 | if (likely(!ret)) | |
359 | ret = persistent_ram_update_user(prz, s, start, c); | |
360 | ||
361 | persistent_ram_update_header_ecc(prz); | |
362 | ||
363 | return unlikely(ret) ? ret : count; | |
364 | } | |
365 | ||
c672528a CC |
366 | size_t persistent_ram_old_size(struct persistent_ram_zone *prz) |
367 | { | |
368 | return prz->old_log_size; | |
369 | } | |
370 | ||
371 | void *persistent_ram_old(struct persistent_ram_zone *prz) | |
372 | { | |
373 | return prz->old_log; | |
374 | } | |
375 | ||
376 | void persistent_ram_free_old(struct persistent_ram_zone *prz) | |
377 | { | |
378 | kfree(prz->old_log); | |
379 | prz->old_log = NULL; | |
380 | prz->old_log_size = 0; | |
381 | } | |
382 | ||
fce39793 AV |
383 | void persistent_ram_zap(struct persistent_ram_zone *prz) |
384 | { | |
385 | atomic_set(&prz->buffer->start, 0); | |
386 | atomic_set(&prz->buffer->size, 0); | |
387 | persistent_ram_update_header_ecc(prz); | |
388 | } | |
389 | ||
027bc8b0 TL |
390 | static void *persistent_ram_vmap(phys_addr_t start, size_t size, |
391 | unsigned int memtype) | |
c672528a | 392 | { |
404a6043 CC |
393 | struct page **pages; |
394 | phys_addr_t page_start; | |
395 | unsigned int page_count; | |
396 | pgprot_t prot; | |
397 | unsigned int i; | |
2b1321e4 | 398 | void *vaddr; |
404a6043 CC |
399 | |
400 | page_start = start - offset_in_page(start); | |
401 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); | |
402 | ||
027bc8b0 TL |
403 | if (memtype) |
404 | prot = pgprot_noncached(PAGE_KERNEL); | |
405 | else | |
406 | prot = pgprot_writecombine(PAGE_KERNEL); | |
404a6043 | 407 | |
b8f52d89 | 408 | pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL); |
404a6043 | 409 | if (!pages) { |
ef748853 FF |
410 | pr_err("%s: Failed to allocate array for %u pages\n", |
411 | __func__, page_count); | |
2b1321e4 | 412 | return NULL; |
404a6043 CC |
413 | } |
414 | ||
415 | for (i = 0; i < page_count; i++) { | |
416 | phys_addr_t addr = page_start + i * PAGE_SIZE; | |
417 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); | |
418 | } | |
2b1321e4 | 419 | vaddr = vmap(pages, page_count, VM_MAP, prot); |
404a6043 | 420 | kfree(pages); |
2b1321e4 AV |
421 | |
422 | return vaddr; | |
423 | } | |
424 | ||
027bc8b0 TL |
425 | static void *persistent_ram_iomap(phys_addr_t start, size_t size, |
426 | unsigned int memtype) | |
24c3d2f3 | 427 | { |
027bc8b0 TL |
428 | void *va; |
429 | ||
24c3d2f3 AV |
430 | if (!request_mem_region(start, size, "persistent_ram")) { |
431 | pr_err("request mem region (0x%llx@0x%llx) failed\n", | |
432 | (unsigned long long)size, (unsigned long long)start); | |
433 | return NULL; | |
434 | } | |
435 | ||
027bc8b0 TL |
436 | if (memtype) |
437 | va = ioremap(start, size); | |
438 | else | |
439 | va = ioremap_wc(start, size); | |
440 | ||
441 | return va; | |
24c3d2f3 AV |
442 | } |
443 | ||
2b1321e4 | 444 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
027bc8b0 | 445 | struct persistent_ram_zone *prz, int memtype) |
2b1321e4 | 446 | { |
d3b48769 AV |
447 | prz->paddr = start; |
448 | prz->size = size; | |
449 | ||
24c3d2f3 | 450 | if (pfn_valid(start >> PAGE_SHIFT)) |
027bc8b0 | 451 | prz->vaddr = persistent_ram_vmap(start, size, memtype); |
24c3d2f3 | 452 | else |
027bc8b0 | 453 | prz->vaddr = persistent_ram_iomap(start, size, memtype); |
24c3d2f3 | 454 | |
404a6043 | 455 | if (!prz->vaddr) { |
2b1321e4 AV |
456 | pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__, |
457 | (unsigned long long)size, (unsigned long long)start); | |
404a6043 CC |
458 | return -ENOMEM; |
459 | } | |
460 | ||
461 | prz->buffer = prz->vaddr + offset_in_page(start); | |
462 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
f568f6ca | 467 | static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig, |
c31ad081 | 468 | struct persistent_ram_ecc_info *ecc_info) |
404a6043 | 469 | { |
bb4206f2 | 470 | int ret; |
c672528a | 471 | |
c31ad081 | 472 | ret = persistent_ram_init_ecc(prz, ecc_info); |
9cc05ad9 | 473 | if (ret) |
bb4206f2 | 474 | return ret; |
c672528a | 475 | |
cbe7cbf5 AV |
476 | sig ^= PERSISTENT_RAM_SIG; |
477 | ||
478 | if (prz->buffer->sig == sig) { | |
808d0387 CC |
479 | if (buffer_size(prz) > prz->buffer_size || |
480 | buffer_start(prz) > buffer_size(prz)) | |
ef748853 FF |
481 | pr_info("found existing invalid buffer, size %zu, start %zu\n", |
482 | buffer_size(prz), buffer_start(prz)); | |
c672528a | 483 | else { |
ef748853 FF |
484 | pr_debug("found existing buffer, size %zu, start %zu\n", |
485 | buffer_size(prz), buffer_start(prz)); | |
c672528a | 486 | persistent_ram_save_old(prz); |
25b63da6 | 487 | return 0; |
c672528a CC |
488 | } |
489 | } else { | |
ef748853 FF |
490 | pr_debug("no valid data in buffer (sig = 0x%08x)\n", |
491 | prz->buffer->sig); | |
c672528a CC |
492 | } |
493 | ||
cbe7cbf5 | 494 | prz->buffer->sig = sig; |
fce39793 | 495 | persistent_ram_zap(prz); |
c672528a | 496 | |
bb4206f2 AV |
497 | return 0; |
498 | } | |
499 | ||
d3b48769 AV |
500 | void persistent_ram_free(struct persistent_ram_zone *prz) |
501 | { | |
beeb9432 AV |
502 | if (!prz) |
503 | return; | |
504 | ||
505 | if (prz->vaddr) { | |
506 | if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { | |
507 | vunmap(prz->vaddr); | |
508 | } else { | |
509 | iounmap(prz->vaddr); | |
510 | release_mem_region(prz->paddr, prz->size); | |
511 | } | |
512 | prz->vaddr = NULL; | |
d3b48769 AV |
513 | } |
514 | persistent_ram_free_old(prz); | |
515 | kfree(prz); | |
516 | } | |
517 | ||
f568f6ca | 518 | struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, |
027bc8b0 TL |
519 | u32 sig, struct persistent_ram_ecc_info *ecc_info, |
520 | unsigned int memtype) | |
8cf5aff8 AV |
521 | { |
522 | struct persistent_ram_zone *prz; | |
523 | int ret = -ENOMEM; | |
524 | ||
525 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); | |
526 | if (!prz) { | |
ef748853 | 527 | pr_err("failed to allocate persistent ram zone\n"); |
8cf5aff8 AV |
528 | goto err; |
529 | } | |
530 | ||
027bc8b0 | 531 | ret = persistent_ram_buffer_map(start, size, prz, memtype); |
8cf5aff8 AV |
532 | if (ret) |
533 | goto err; | |
534 | ||
c31ad081 | 535 | ret = persistent_ram_post_init(prz, sig, ecc_info); |
beeb9432 AV |
536 | if (ret) |
537 | goto err; | |
8cf5aff8 AV |
538 | |
539 | return prz; | |
540 | err: | |
beeb9432 | 541 | persistent_ram_free(prz); |
8cf5aff8 AV |
542 | return ERR_PTR(ret); |
543 | } |