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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 | 51 | /* increase and wrap the start pointer, returning the old value */ |
d5a9bf0b | 52 | static size_t buffer_start_add(struct persistent_ram_zone *prz, size_t a) |
0405a5ce RH |
53 | { |
54 | int old; | |
55 | int new; | |
663deb47 | 56 | unsigned long flags = 0; |
0405a5ce | 57 | |
663deb47 JF |
58 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
59 | raw_spin_lock_irqsave(&prz->buffer_lock, flags); | |
0405a5ce RH |
60 | |
61 | old = atomic_read(&prz->buffer->start); | |
62 | new = old + a; | |
017321cf | 63 | while (unlikely(new >= prz->buffer_size)) |
0405a5ce RH |
64 | new -= prz->buffer_size; |
65 | atomic_set(&prz->buffer->start, new); | |
66 | ||
663deb47 JF |
67 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
68 | raw_spin_unlock_irqrestore(&prz->buffer_lock, flags); | |
0405a5ce RH |
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; | |
663deb47 | 78 | unsigned long flags = 0; |
0405a5ce | 79 | |
663deb47 JF |
80 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
81 | raw_spin_lock_irqsave(&prz->buffer_lock, flags); | |
0405a5ce RH |
82 | |
83 | old = atomic_read(&prz->buffer->size); | |
84 | if (old == prz->buffer_size) | |
85 | goto exit; | |
86 | ||
87 | new = old + a; | |
88 | if (new > prz->buffer_size) | |
89 | new = prz->buffer_size; | |
90 | atomic_set(&prz->buffer->size, new); | |
91 | ||
92 | exit: | |
663deb47 JF |
93 | if (!(prz->flags & PRZ_FLAG_NO_LOCK)) |
94 | raw_spin_unlock_irqrestore(&prz->buffer_lock, flags); | |
0405a5ce RH |
95 | } |
96 | ||
a15d0b36 | 97 | static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, |
c672528a CC |
98 | uint8_t *data, size_t len, uint8_t *ecc) |
99 | { | |
100 | int i; | |
c31ad081 | 101 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 102 | |
c672528a CC |
103 | /* Initialize the parity buffer */ |
104 | memset(par, 0, sizeof(par)); | |
105 | encode_rs8(prz->rs_decoder, data, len, par, 0); | |
c31ad081 | 106 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
107 | ecc[i] = par[i]; |
108 | } | |
109 | ||
110 | static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, | |
111 | void *data, size_t len, uint8_t *ecc) | |
112 | { | |
113 | int i; | |
c31ad081 | 114 | uint16_t par[prz->ecc_info.ecc_size]; |
9cc05ad9 | 115 | |
c31ad081 | 116 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
c672528a CC |
117 | par[i] = ecc[i]; |
118 | return decode_rs8(prz->rs_decoder, data, par, len, | |
119 | NULL, 0, NULL, 0, NULL); | |
120 | } | |
c672528a | 121 | |
a15d0b36 | 122 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
808d0387 | 123 | unsigned int start, unsigned int count) |
c672528a CC |
124 | { |
125 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
126 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
127 | uint8_t *block; | |
128 | uint8_t *par; | |
c31ad081 AH |
129 | int ecc_block_size = prz->ecc_info.block_size; |
130 | int ecc_size = prz->ecc_info.ecc_size; | |
131 | int size = ecc_block_size; | |
9cc05ad9 | 132 | |
c31ad081 | 133 | if (!ecc_size) |
9cc05ad9 CC |
134 | return; |
135 | ||
808d0387 | 136 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
c31ad081 | 137 | par = prz->par_buffer + (start / ecc_block_size) * ecc_size; |
808d0387 | 138 | |
c672528a | 139 | do { |
9cc05ad9 | 140 | if (block + ecc_block_size > buffer_end) |
c672528a CC |
141 | size = buffer_end - block; |
142 | persistent_ram_encode_rs8(prz, block, size, par); | |
9cc05ad9 CC |
143 | block += ecc_block_size; |
144 | par += ecc_size; | |
808d0387 | 145 | } while (block < buffer->data + start + count); |
c672528a CC |
146 | } |
147 | ||
9cc05ad9 | 148 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
c672528a | 149 | { |
c672528a CC |
150 | struct persistent_ram_buffer *buffer = prz->buffer; |
151 | ||
c31ad081 | 152 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
153 | return; |
154 | ||
c672528a CC |
155 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
156 | prz->par_header); | |
c672528a CC |
157 | } |
158 | ||
9cc05ad9 | 159 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
c672528a CC |
160 | { |
161 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
162 | uint8_t *block; |
163 | uint8_t *par; | |
164 | ||
c31ad081 | 165 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
166 | return; |
167 | ||
c672528a CC |
168 | block = buffer->data; |
169 | par = prz->par_buffer; | |
808d0387 | 170 | while (block < buffer->data + buffer_size(prz)) { |
c672528a | 171 | int numerr; |
c31ad081 | 172 | int size = prz->ecc_info.block_size; |
c672528a CC |
173 | if (block + size > buffer->data + prz->buffer_size) |
174 | size = buffer->data + prz->buffer_size - block; | |
175 | numerr = persistent_ram_decode_rs8(prz, block, size, par); | |
176 | if (numerr > 0) { | |
ef748853 | 177 | pr_devel("error in block %p, %d\n", block, numerr); |
c672528a CC |
178 | prz->corrected_bytes += numerr; |
179 | } else if (numerr < 0) { | |
ef748853 | 180 | pr_devel("uncorrectable error in block %p\n", block); |
c672528a CC |
181 | prz->bad_blocks++; |
182 | } | |
c31ad081 AH |
183 | block += prz->ecc_info.block_size; |
184 | par += prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
185 | } |
186 | } | |
187 | ||
5ca5d4e6 | 188 | static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, |
c31ad081 | 189 | struct persistent_ram_ecc_info *ecc_info) |
9cc05ad9 CC |
190 | { |
191 | int numerr; | |
192 | struct persistent_ram_buffer *buffer = prz->buffer; | |
193 | int ecc_blocks; | |
1e6a9e56 | 194 | size_t ecc_total; |
9cc05ad9 | 195 | |
c31ad081 | 196 | if (!ecc_info || !ecc_info->ecc_size) |
9cc05ad9 CC |
197 | return 0; |
198 | ||
c31ad081 AH |
199 | prz->ecc_info.block_size = ecc_info->block_size ?: 128; |
200 | prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16; | |
201 | prz->ecc_info.symsize = ecc_info->symsize ?: 8; | |
202 | prz->ecc_info.poly = ecc_info->poly ?: 0x11d; | |
9cc05ad9 | 203 | |
c31ad081 AH |
204 | ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size, |
205 | prz->ecc_info.block_size + | |
206 | prz->ecc_info.ecc_size); | |
207 | ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size; | |
1e6a9e56 AV |
208 | if (ecc_total >= prz->buffer_size) { |
209 | pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n", | |
c31ad081 AH |
210 | __func__, prz->ecc_info.ecc_size, |
211 | ecc_total, prz->buffer_size); | |
9cc05ad9 CC |
212 | return -EINVAL; |
213 | } | |
214 | ||
1e6a9e56 | 215 | prz->buffer_size -= ecc_total; |
9cc05ad9 | 216 | prz->par_buffer = buffer->data + prz->buffer_size; |
c31ad081 AH |
217 | prz->par_header = prz->par_buffer + |
218 | ecc_blocks * prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
219 | |
220 | /* | |
221 | * first consecutive root is 0 | |
222 | * primitive element to generate roots = 1 | |
223 | */ | |
c31ad081 AH |
224 | prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly, |
225 | 0, 1, prz->ecc_info.ecc_size); | |
9cc05ad9 | 226 | if (prz->rs_decoder == NULL) { |
ef748853 | 227 | pr_info("init_rs failed\n"); |
9cc05ad9 | 228 | return -EINVAL; |
c672528a | 229 | } |
9cc05ad9 CC |
230 | |
231 | prz->corrected_bytes = 0; | |
232 | prz->bad_blocks = 0; | |
233 | ||
234 | numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer), | |
235 | prz->par_header); | |
236 | if (numerr > 0) { | |
ef748853 | 237 | pr_info("error in header, %d\n", numerr); |
9cc05ad9 CC |
238 | prz->corrected_bytes += numerr; |
239 | } else if (numerr < 0) { | |
ef748853 | 240 | pr_info("uncorrectable error in header\n"); |
9cc05ad9 CC |
241 | prz->bad_blocks++; |
242 | } | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, | |
248 | char *str, size_t len) | |
249 | { | |
250 | ssize_t ret; | |
251 | ||
bd08ec33 AH |
252 | if (!prz->ecc_info.ecc_size) |
253 | return 0; | |
254 | ||
9cc05ad9 CC |
255 | if (prz->corrected_bytes || prz->bad_blocks) |
256 | ret = snprintf(str, len, "" | |
257 | "\n%d Corrected bytes, %d unrecoverable blocks\n", | |
258 | prz->corrected_bytes, prz->bad_blocks); | |
259 | else | |
260 | ret = snprintf(str, len, "\nNo errors detected\n"); | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
a15d0b36 | 265 | static void notrace persistent_ram_update(struct persistent_ram_zone *prz, |
808d0387 | 266 | const void *s, unsigned int start, unsigned int count) |
9cc05ad9 CC |
267 | { |
268 | struct persistent_ram_buffer *buffer = prz->buffer; | |
7e75678d | 269 | memcpy_toio(buffer->data + start, s, count); |
808d0387 | 270 | persistent_ram_update_ecc(prz, start, count); |
9cc05ad9 CC |
271 | } |
272 | ||
5bf6d1b9 MS |
273 | static int notrace persistent_ram_update_user(struct persistent_ram_zone *prz, |
274 | const void __user *s, unsigned int start, unsigned int count) | |
275 | { | |
276 | struct persistent_ram_buffer *buffer = prz->buffer; | |
277 | int ret = unlikely(__copy_from_user(buffer->data + start, s, count)) ? | |
278 | -EFAULT : 0; | |
279 | persistent_ram_update_ecc(prz, start, count); | |
280 | return ret; | |
281 | } | |
282 | ||
201e4aca | 283 | void persistent_ram_save_old(struct persistent_ram_zone *prz) |
9cc05ad9 CC |
284 | { |
285 | struct persistent_ram_buffer *buffer = prz->buffer; | |
808d0387 CC |
286 | size_t size = buffer_size(prz); |
287 | size_t start = buffer_start(prz); | |
9cc05ad9 | 288 | |
201e4aca AV |
289 | if (!size) |
290 | return; | |
c672528a | 291 | |
201e4aca AV |
292 | if (!prz->old_log) { |
293 | persistent_ram_ecc_old(prz); | |
294 | prz->old_log = kmalloc(size, GFP_KERNEL); | |
295 | } | |
296 | if (!prz->old_log) { | |
ef748853 | 297 | pr_err("failed to allocate buffer\n"); |
c672528a CC |
298 | return; |
299 | } | |
300 | ||
808d0387 | 301 | prz->old_log_size = size; |
d771fdf9 AB |
302 | memcpy_fromio(prz->old_log, &buffer->data[start], size - start); |
303 | memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start); | |
c672528a CC |
304 | } |
305 | ||
a15d0b36 | 306 | int notrace persistent_ram_write(struct persistent_ram_zone *prz, |
c672528a CC |
307 | const void *s, unsigned int count) |
308 | { | |
309 | int rem; | |
310 | int c = count; | |
808d0387 | 311 | size_t start; |
c672528a | 312 | |
808d0387 | 313 | if (unlikely(c > prz->buffer_size)) { |
c672528a CC |
314 | s += c - prz->buffer_size; |
315 | c = prz->buffer_size; | |
316 | } | |
808d0387 | 317 | |
484dd30e | 318 | buffer_size_add(prz, c); |
808d0387 CC |
319 | |
320 | start = buffer_start_add(prz, c); | |
321 | ||
322 | rem = prz->buffer_size - start; | |
323 | if (unlikely(rem < c)) { | |
324 | persistent_ram_update(prz, s, start, rem); | |
c672528a CC |
325 | s += rem; |
326 | c -= rem; | |
808d0387 | 327 | start = 0; |
c672528a | 328 | } |
808d0387 | 329 | persistent_ram_update(prz, s, start, c); |
c672528a | 330 | |
9cc05ad9 | 331 | persistent_ram_update_header_ecc(prz); |
c672528a CC |
332 | |
333 | return count; | |
334 | } | |
335 | ||
5bf6d1b9 MS |
336 | int notrace persistent_ram_write_user(struct persistent_ram_zone *prz, |
337 | const void __user *s, unsigned int count) | |
338 | { | |
339 | int rem, ret = 0, c = count; | |
340 | size_t start; | |
341 | ||
342 | if (unlikely(!access_ok(VERIFY_READ, s, count))) | |
343 | return -EFAULT; | |
344 | if (unlikely(c > prz->buffer_size)) { | |
345 | s += c - prz->buffer_size; | |
346 | c = prz->buffer_size; | |
347 | } | |
348 | ||
349 | buffer_size_add(prz, c); | |
350 | ||
351 | start = buffer_start_add(prz, c); | |
352 | ||
353 | rem = prz->buffer_size - start; | |
354 | if (unlikely(rem < c)) { | |
355 | ret = persistent_ram_update_user(prz, s, start, rem); | |
356 | s += rem; | |
357 | c -= rem; | |
358 | start = 0; | |
359 | } | |
360 | if (likely(!ret)) | |
361 | ret = persistent_ram_update_user(prz, s, start, c); | |
362 | ||
363 | persistent_ram_update_header_ecc(prz); | |
364 | ||
365 | return unlikely(ret) ? ret : count; | |
366 | } | |
367 | ||
c672528a CC |
368 | size_t persistent_ram_old_size(struct persistent_ram_zone *prz) |
369 | { | |
370 | return prz->old_log_size; | |
371 | } | |
372 | ||
373 | void *persistent_ram_old(struct persistent_ram_zone *prz) | |
374 | { | |
375 | return prz->old_log; | |
376 | } | |
377 | ||
378 | void persistent_ram_free_old(struct persistent_ram_zone *prz) | |
379 | { | |
380 | kfree(prz->old_log); | |
381 | prz->old_log = NULL; | |
382 | prz->old_log_size = 0; | |
383 | } | |
384 | ||
fce39793 AV |
385 | void persistent_ram_zap(struct persistent_ram_zone *prz) |
386 | { | |
387 | atomic_set(&prz->buffer->start, 0); | |
388 | atomic_set(&prz->buffer->size, 0); | |
389 | persistent_ram_update_header_ecc(prz); | |
390 | } | |
391 | ||
027bc8b0 TL |
392 | static void *persistent_ram_vmap(phys_addr_t start, size_t size, |
393 | unsigned int memtype) | |
c672528a | 394 | { |
404a6043 CC |
395 | struct page **pages; |
396 | phys_addr_t page_start; | |
397 | unsigned int page_count; | |
398 | pgprot_t prot; | |
399 | unsigned int i; | |
2b1321e4 | 400 | void *vaddr; |
404a6043 CC |
401 | |
402 | page_start = start - offset_in_page(start); | |
403 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); | |
404 | ||
027bc8b0 TL |
405 | if (memtype) |
406 | prot = pgprot_noncached(PAGE_KERNEL); | |
407 | else | |
408 | prot = pgprot_writecombine(PAGE_KERNEL); | |
404a6043 | 409 | |
b8f52d89 | 410 | pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL); |
404a6043 | 411 | if (!pages) { |
ef748853 FF |
412 | pr_err("%s: Failed to allocate array for %u pages\n", |
413 | __func__, page_count); | |
2b1321e4 | 414 | return NULL; |
404a6043 CC |
415 | } |
416 | ||
417 | for (i = 0; i < page_count; i++) { | |
418 | phys_addr_t addr = page_start + i * PAGE_SIZE; | |
419 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); | |
420 | } | |
2b1321e4 | 421 | vaddr = vmap(pages, page_count, VM_MAP, prot); |
404a6043 | 422 | kfree(pages); |
2b1321e4 AV |
423 | |
424 | return vaddr; | |
425 | } | |
426 | ||
027bc8b0 TL |
427 | static void *persistent_ram_iomap(phys_addr_t start, size_t size, |
428 | unsigned int memtype) | |
24c3d2f3 | 429 | { |
027bc8b0 TL |
430 | void *va; |
431 | ||
24c3d2f3 AV |
432 | if (!request_mem_region(start, size, "persistent_ram")) { |
433 | pr_err("request mem region (0x%llx@0x%llx) failed\n", | |
434 | (unsigned long long)size, (unsigned long long)start); | |
435 | return NULL; | |
436 | } | |
437 | ||
027bc8b0 TL |
438 | if (memtype) |
439 | va = ioremap(start, size); | |
440 | else | |
441 | va = ioremap_wc(start, size); | |
442 | ||
443 | return va; | |
24c3d2f3 AV |
444 | } |
445 | ||
2b1321e4 | 446 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
027bc8b0 | 447 | struct persistent_ram_zone *prz, int memtype) |
2b1321e4 | 448 | { |
d3b48769 AV |
449 | prz->paddr = start; |
450 | prz->size = size; | |
451 | ||
24c3d2f3 | 452 | if (pfn_valid(start >> PAGE_SHIFT)) |
027bc8b0 | 453 | prz->vaddr = persistent_ram_vmap(start, size, memtype); |
24c3d2f3 | 454 | else |
027bc8b0 | 455 | prz->vaddr = persistent_ram_iomap(start, size, memtype); |
24c3d2f3 | 456 | |
404a6043 | 457 | if (!prz->vaddr) { |
2b1321e4 AV |
458 | pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__, |
459 | (unsigned long long)size, (unsigned long long)start); | |
404a6043 CC |
460 | return -ENOMEM; |
461 | } | |
462 | ||
463 | prz->buffer = prz->vaddr + offset_in_page(start); | |
464 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
f568f6ca | 469 | static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig, |
663deb47 JF |
470 | struct persistent_ram_ecc_info *ecc_info, |
471 | unsigned long flags) | |
404a6043 | 472 | { |
bb4206f2 | 473 | int ret; |
c672528a | 474 | |
c31ad081 | 475 | ret = persistent_ram_init_ecc(prz, ecc_info); |
9cc05ad9 | 476 | if (ret) |
bb4206f2 | 477 | return ret; |
c672528a | 478 | |
cbe7cbf5 AV |
479 | sig ^= PERSISTENT_RAM_SIG; |
480 | ||
481 | if (prz->buffer->sig == sig) { | |
808d0387 CC |
482 | if (buffer_size(prz) > prz->buffer_size || |
483 | buffer_start(prz) > buffer_size(prz)) | |
ef748853 FF |
484 | pr_info("found existing invalid buffer, size %zu, start %zu\n", |
485 | buffer_size(prz), buffer_start(prz)); | |
c672528a | 486 | else { |
ef748853 FF |
487 | pr_debug("found existing buffer, size %zu, start %zu\n", |
488 | buffer_size(prz), buffer_start(prz)); | |
c672528a | 489 | persistent_ram_save_old(prz); |
25b63da6 | 490 | return 0; |
c672528a CC |
491 | } |
492 | } else { | |
ef748853 FF |
493 | pr_debug("no valid data in buffer (sig = 0x%08x)\n", |
494 | prz->buffer->sig); | |
c672528a CC |
495 | } |
496 | ||
cbe7cbf5 | 497 | prz->buffer->sig = sig; |
fce39793 | 498 | persistent_ram_zap(prz); |
10970449 | 499 | prz->buffer_lock = __RAW_SPIN_LOCK_UNLOCKED(buffer_lock); |
663deb47 | 500 | prz->flags = flags; |
c672528a | 501 | |
bb4206f2 AV |
502 | return 0; |
503 | } | |
504 | ||
d3b48769 AV |
505 | void persistent_ram_free(struct persistent_ram_zone *prz) |
506 | { | |
beeb9432 AV |
507 | if (!prz) |
508 | return; | |
509 | ||
510 | if (prz->vaddr) { | |
511 | if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { | |
512 | vunmap(prz->vaddr); | |
513 | } else { | |
514 | iounmap(prz->vaddr); | |
515 | release_mem_region(prz->paddr, prz->size); | |
516 | } | |
517 | prz->vaddr = NULL; | |
d3b48769 AV |
518 | } |
519 | persistent_ram_free_old(prz); | |
520 | kfree(prz); | |
521 | } | |
522 | ||
f568f6ca | 523 | struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, |
027bc8b0 | 524 | u32 sig, struct persistent_ram_ecc_info *ecc_info, |
663deb47 | 525 | unsigned int memtype, u32 flags) |
8cf5aff8 AV |
526 | { |
527 | struct persistent_ram_zone *prz; | |
528 | int ret = -ENOMEM; | |
529 | ||
530 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); | |
531 | if (!prz) { | |
ef748853 | 532 | pr_err("failed to allocate persistent ram zone\n"); |
8cf5aff8 AV |
533 | goto err; |
534 | } | |
535 | ||
027bc8b0 | 536 | ret = persistent_ram_buffer_map(start, size, prz, memtype); |
8cf5aff8 AV |
537 | if (ret) |
538 | goto err; | |
539 | ||
663deb47 | 540 | ret = persistent_ram_post_init(prz, sig, ecc_info, flags); |
beeb9432 AV |
541 | if (ret) |
542 | goto err; | |
8cf5aff8 AV |
543 | |
544 | return prz; | |
545 | err: | |
beeb9432 | 546 | persistent_ram_free(prz); |
8cf5aff8 AV |
547 | return ERR_PTR(ret); |
548 | } |