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 | ||
9ee85b8b | 15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
ef748853 | 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; | |
9cc05ad9 | 101 | |
c672528a | 102 | /* Initialize the parity buffer */ |
f2531f19 KC |
103 | memset(prz->ecc_info.par, 0, |
104 | prz->ecc_info.ecc_size * sizeof(prz->ecc_info.par[0])); | |
105 | encode_rs8(prz->rs_decoder, data, len, prz->ecc_info.par, 0); | |
c31ad081 | 106 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
f2531f19 | 107 | ecc[i] = prz->ecc_info.par[i]; |
c672528a CC |
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; | |
9cc05ad9 | 114 | |
c31ad081 | 115 | for (i = 0; i < prz->ecc_info.ecc_size; i++) |
f2531f19 KC |
116 | prz->ecc_info.par[i] = ecc[i]; |
117 | return decode_rs8(prz->rs_decoder, data, prz->ecc_info.par, len, | |
c672528a CC |
118 | NULL, 0, NULL, 0, NULL); |
119 | } | |
c672528a | 120 | |
a15d0b36 | 121 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
808d0387 | 122 | unsigned int start, unsigned int count) |
c672528a CC |
123 | { |
124 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
125 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
126 | uint8_t *block; | |
127 | uint8_t *par; | |
c31ad081 AH |
128 | int ecc_block_size = prz->ecc_info.block_size; |
129 | int ecc_size = prz->ecc_info.ecc_size; | |
130 | int size = ecc_block_size; | |
9cc05ad9 | 131 | |
c31ad081 | 132 | if (!ecc_size) |
9cc05ad9 CC |
133 | return; |
134 | ||
808d0387 | 135 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
c31ad081 | 136 | par = prz->par_buffer + (start / ecc_block_size) * ecc_size; |
808d0387 | 137 | |
c672528a | 138 | do { |
9cc05ad9 | 139 | if (block + ecc_block_size > buffer_end) |
c672528a CC |
140 | size = buffer_end - block; |
141 | persistent_ram_encode_rs8(prz, block, size, par); | |
9cc05ad9 CC |
142 | block += ecc_block_size; |
143 | par += ecc_size; | |
808d0387 | 144 | } while (block < buffer->data + start + count); |
c672528a CC |
145 | } |
146 | ||
9cc05ad9 | 147 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
c672528a | 148 | { |
c672528a CC |
149 | struct persistent_ram_buffer *buffer = prz->buffer; |
150 | ||
c31ad081 | 151 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
152 | return; |
153 | ||
c672528a CC |
154 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
155 | prz->par_header); | |
c672528a CC |
156 | } |
157 | ||
9cc05ad9 | 158 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
c672528a CC |
159 | { |
160 | struct persistent_ram_buffer *buffer = prz->buffer; | |
c672528a CC |
161 | uint8_t *block; |
162 | uint8_t *par; | |
163 | ||
c31ad081 | 164 | if (!prz->ecc_info.ecc_size) |
9cc05ad9 CC |
165 | return; |
166 | ||
c672528a CC |
167 | block = buffer->data; |
168 | par = prz->par_buffer; | |
808d0387 | 169 | while (block < buffer->data + buffer_size(prz)) { |
c672528a | 170 | int numerr; |
c31ad081 | 171 | int size = prz->ecc_info.block_size; |
c672528a CC |
172 | if (block + size > buffer->data + prz->buffer_size) |
173 | size = buffer->data + prz->buffer_size - block; | |
174 | numerr = persistent_ram_decode_rs8(prz, block, size, par); | |
175 | if (numerr > 0) { | |
ef748853 | 176 | pr_devel("error in block %p, %d\n", block, numerr); |
c672528a CC |
177 | prz->corrected_bytes += numerr; |
178 | } else if (numerr < 0) { | |
ef748853 | 179 | pr_devel("uncorrectable error in block %p\n", block); |
c672528a CC |
180 | prz->bad_blocks++; |
181 | } | |
c31ad081 AH |
182 | block += prz->ecc_info.block_size; |
183 | par += prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
184 | } |
185 | } | |
186 | ||
5ca5d4e6 | 187 | static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, |
c31ad081 | 188 | struct persistent_ram_ecc_info *ecc_info) |
9cc05ad9 CC |
189 | { |
190 | int numerr; | |
191 | struct persistent_ram_buffer *buffer = prz->buffer; | |
192 | int ecc_blocks; | |
1e6a9e56 | 193 | size_t ecc_total; |
9cc05ad9 | 194 | |
c31ad081 | 195 | if (!ecc_info || !ecc_info->ecc_size) |
9cc05ad9 CC |
196 | return 0; |
197 | ||
c31ad081 AH |
198 | prz->ecc_info.block_size = ecc_info->block_size ?: 128; |
199 | prz->ecc_info.ecc_size = ecc_info->ecc_size ?: 16; | |
200 | prz->ecc_info.symsize = ecc_info->symsize ?: 8; | |
201 | prz->ecc_info.poly = ecc_info->poly ?: 0x11d; | |
9cc05ad9 | 202 | |
c31ad081 AH |
203 | ecc_blocks = DIV_ROUND_UP(prz->buffer_size - prz->ecc_info.ecc_size, |
204 | prz->ecc_info.block_size + | |
205 | prz->ecc_info.ecc_size); | |
206 | ecc_total = (ecc_blocks + 1) * prz->ecc_info.ecc_size; | |
1e6a9e56 AV |
207 | if (ecc_total >= prz->buffer_size) { |
208 | pr_err("%s: invalid ecc_size %u (total %zu, buffer size %zu)\n", | |
c31ad081 AH |
209 | __func__, prz->ecc_info.ecc_size, |
210 | ecc_total, prz->buffer_size); | |
9cc05ad9 CC |
211 | return -EINVAL; |
212 | } | |
213 | ||
1e6a9e56 | 214 | prz->buffer_size -= ecc_total; |
9cc05ad9 | 215 | prz->par_buffer = buffer->data + prz->buffer_size; |
c31ad081 AH |
216 | prz->par_header = prz->par_buffer + |
217 | ecc_blocks * prz->ecc_info.ecc_size; | |
9cc05ad9 CC |
218 | |
219 | /* | |
220 | * first consecutive root is 0 | |
221 | * primitive element to generate roots = 1 | |
222 | */ | |
c31ad081 AH |
223 | prz->rs_decoder = init_rs(prz->ecc_info.symsize, prz->ecc_info.poly, |
224 | 0, 1, prz->ecc_info.ecc_size); | |
9cc05ad9 | 225 | if (prz->rs_decoder == NULL) { |
ef748853 | 226 | pr_info("init_rs failed\n"); |
9cc05ad9 | 227 | return -EINVAL; |
c672528a | 228 | } |
9cc05ad9 | 229 | |
f2531f19 KC |
230 | /* allocate workspace instead of using stack VLA */ |
231 | prz->ecc_info.par = kmalloc_array(prz->ecc_info.ecc_size, | |
232 | sizeof(*prz->ecc_info.par), | |
233 | GFP_KERNEL); | |
234 | if (!prz->ecc_info.par) { | |
235 | pr_err("cannot allocate ECC parity workspace\n"); | |
236 | return -ENOMEM; | |
237 | } | |
238 | ||
9cc05ad9 CC |
239 | prz->corrected_bytes = 0; |
240 | prz->bad_blocks = 0; | |
241 | ||
242 | numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer), | |
243 | prz->par_header); | |
244 | if (numerr > 0) { | |
ef748853 | 245 | pr_info("error in header, %d\n", numerr); |
9cc05ad9 CC |
246 | prz->corrected_bytes += numerr; |
247 | } else if (numerr < 0) { | |
ef748853 | 248 | pr_info("uncorrectable error in header\n"); |
9cc05ad9 CC |
249 | prz->bad_blocks++; |
250 | } | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, | |
256 | char *str, size_t len) | |
257 | { | |
258 | ssize_t ret; | |
259 | ||
bd08ec33 AH |
260 | if (!prz->ecc_info.ecc_size) |
261 | return 0; | |
262 | ||
9cc05ad9 CC |
263 | if (prz->corrected_bytes || prz->bad_blocks) |
264 | ret = snprintf(str, len, "" | |
265 | "\n%d Corrected bytes, %d unrecoverable blocks\n", | |
266 | prz->corrected_bytes, prz->bad_blocks); | |
267 | else | |
268 | ret = snprintf(str, len, "\nNo errors detected\n"); | |
269 | ||
270 | return ret; | |
271 | } | |
272 | ||
a15d0b36 | 273 | static void notrace persistent_ram_update(struct persistent_ram_zone *prz, |
808d0387 | 274 | const void *s, unsigned int start, unsigned int count) |
9cc05ad9 CC |
275 | { |
276 | struct persistent_ram_buffer *buffer = prz->buffer; | |
7e75678d | 277 | memcpy_toio(buffer->data + start, s, count); |
808d0387 | 278 | persistent_ram_update_ecc(prz, start, count); |
9cc05ad9 CC |
279 | } |
280 | ||
5bf6d1b9 MS |
281 | static int notrace persistent_ram_update_user(struct persistent_ram_zone *prz, |
282 | const void __user *s, unsigned int start, unsigned int count) | |
283 | { | |
284 | struct persistent_ram_buffer *buffer = prz->buffer; | |
285 | int ret = unlikely(__copy_from_user(buffer->data + start, s, count)) ? | |
286 | -EFAULT : 0; | |
287 | persistent_ram_update_ecc(prz, start, count); | |
288 | return ret; | |
289 | } | |
290 | ||
201e4aca | 291 | void persistent_ram_save_old(struct persistent_ram_zone *prz) |
9cc05ad9 CC |
292 | { |
293 | struct persistent_ram_buffer *buffer = prz->buffer; | |
808d0387 CC |
294 | size_t size = buffer_size(prz); |
295 | size_t start = buffer_start(prz); | |
9cc05ad9 | 296 | |
201e4aca AV |
297 | if (!size) |
298 | return; | |
c672528a | 299 | |
201e4aca AV |
300 | if (!prz->old_log) { |
301 | persistent_ram_ecc_old(prz); | |
302 | prz->old_log = kmalloc(size, GFP_KERNEL); | |
303 | } | |
304 | if (!prz->old_log) { | |
ef748853 | 305 | pr_err("failed to allocate buffer\n"); |
c672528a CC |
306 | return; |
307 | } | |
308 | ||
808d0387 | 309 | prz->old_log_size = size; |
d771fdf9 AB |
310 | memcpy_fromio(prz->old_log, &buffer->data[start], size - start); |
311 | memcpy_fromio(prz->old_log + size - start, &buffer->data[0], start); | |
c672528a CC |
312 | } |
313 | ||
a15d0b36 | 314 | int notrace persistent_ram_write(struct persistent_ram_zone *prz, |
c672528a CC |
315 | const void *s, unsigned int count) |
316 | { | |
317 | int rem; | |
318 | int c = count; | |
808d0387 | 319 | size_t start; |
c672528a | 320 | |
808d0387 | 321 | if (unlikely(c > prz->buffer_size)) { |
c672528a CC |
322 | s += c - prz->buffer_size; |
323 | c = prz->buffer_size; | |
324 | } | |
808d0387 | 325 | |
484dd30e | 326 | buffer_size_add(prz, c); |
808d0387 CC |
327 | |
328 | start = buffer_start_add(prz, c); | |
329 | ||
330 | rem = prz->buffer_size - start; | |
331 | if (unlikely(rem < c)) { | |
332 | persistent_ram_update(prz, s, start, rem); | |
c672528a CC |
333 | s += rem; |
334 | c -= rem; | |
808d0387 | 335 | start = 0; |
c672528a | 336 | } |
808d0387 | 337 | persistent_ram_update(prz, s, start, c); |
c672528a | 338 | |
9cc05ad9 | 339 | persistent_ram_update_header_ecc(prz); |
c672528a CC |
340 | |
341 | return count; | |
342 | } | |
343 | ||
5bf6d1b9 MS |
344 | int notrace persistent_ram_write_user(struct persistent_ram_zone *prz, |
345 | const void __user *s, unsigned int count) | |
346 | { | |
347 | int rem, ret = 0, c = count; | |
348 | size_t start; | |
349 | ||
350 | if (unlikely(!access_ok(VERIFY_READ, s, count))) | |
351 | return -EFAULT; | |
352 | if (unlikely(c > prz->buffer_size)) { | |
353 | s += c - prz->buffer_size; | |
354 | c = prz->buffer_size; | |
355 | } | |
356 | ||
357 | buffer_size_add(prz, c); | |
358 | ||
359 | start = buffer_start_add(prz, c); | |
360 | ||
361 | rem = prz->buffer_size - start; | |
362 | if (unlikely(rem < c)) { | |
363 | ret = persistent_ram_update_user(prz, s, start, rem); | |
364 | s += rem; | |
365 | c -= rem; | |
366 | start = 0; | |
367 | } | |
368 | if (likely(!ret)) | |
369 | ret = persistent_ram_update_user(prz, s, start, c); | |
370 | ||
371 | persistent_ram_update_header_ecc(prz); | |
372 | ||
373 | return unlikely(ret) ? ret : count; | |
374 | } | |
375 | ||
c672528a CC |
376 | size_t persistent_ram_old_size(struct persistent_ram_zone *prz) |
377 | { | |
378 | return prz->old_log_size; | |
379 | } | |
380 | ||
381 | void *persistent_ram_old(struct persistent_ram_zone *prz) | |
382 | { | |
383 | return prz->old_log; | |
384 | } | |
385 | ||
386 | void persistent_ram_free_old(struct persistent_ram_zone *prz) | |
387 | { | |
388 | kfree(prz->old_log); | |
389 | prz->old_log = NULL; | |
390 | prz->old_log_size = 0; | |
391 | } | |
392 | ||
fce39793 AV |
393 | void persistent_ram_zap(struct persistent_ram_zone *prz) |
394 | { | |
395 | atomic_set(&prz->buffer->start, 0); | |
396 | atomic_set(&prz->buffer->size, 0); | |
397 | persistent_ram_update_header_ecc(prz); | |
398 | } | |
399 | ||
027bc8b0 TL |
400 | static void *persistent_ram_vmap(phys_addr_t start, size_t size, |
401 | unsigned int memtype) | |
c672528a | 402 | { |
404a6043 CC |
403 | struct page **pages; |
404 | phys_addr_t page_start; | |
405 | unsigned int page_count; | |
406 | pgprot_t prot; | |
407 | unsigned int i; | |
2b1321e4 | 408 | void *vaddr; |
404a6043 CC |
409 | |
410 | page_start = start - offset_in_page(start); | |
411 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); | |
412 | ||
027bc8b0 TL |
413 | if (memtype) |
414 | prot = pgprot_noncached(PAGE_KERNEL); | |
415 | else | |
416 | prot = pgprot_writecombine(PAGE_KERNEL); | |
404a6043 | 417 | |
b8f52d89 | 418 | pages = kmalloc_array(page_count, sizeof(struct page *), GFP_KERNEL); |
404a6043 | 419 | if (!pages) { |
ef748853 FF |
420 | pr_err("%s: Failed to allocate array for %u pages\n", |
421 | __func__, page_count); | |
2b1321e4 | 422 | return NULL; |
404a6043 CC |
423 | } |
424 | ||
425 | for (i = 0; i < page_count; i++) { | |
426 | phys_addr_t addr = page_start + i * PAGE_SIZE; | |
427 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); | |
428 | } | |
2b1321e4 | 429 | vaddr = vmap(pages, page_count, VM_MAP, prot); |
404a6043 | 430 | kfree(pages); |
2b1321e4 | 431 | |
831b624d BY |
432 | /* |
433 | * Since vmap() uses page granularity, we must add the offset | |
434 | * into the page here, to get the byte granularity address | |
435 | * into the mapping to represent the actual "start" location. | |
436 | */ | |
437 | return vaddr + offset_in_page(start); | |
2b1321e4 AV |
438 | } |
439 | ||
027bc8b0 | 440 | static void *persistent_ram_iomap(phys_addr_t start, size_t size, |
1227daa4 | 441 | unsigned int memtype, char *label) |
24c3d2f3 | 442 | { |
027bc8b0 TL |
443 | void *va; |
444 | ||
1227daa4 | 445 | if (!request_mem_region(start, size, label ?: "ramoops")) { |
9ee85b8b KC |
446 | pr_err("request mem region (%s 0x%llx@0x%llx) failed\n", |
447 | label ?: "ramoops", | |
24c3d2f3 AV |
448 | (unsigned long long)size, (unsigned long long)start); |
449 | return NULL; | |
450 | } | |
451 | ||
027bc8b0 TL |
452 | if (memtype) |
453 | va = ioremap(start, size); | |
454 | else | |
455 | va = ioremap_wc(start, size); | |
456 | ||
831b624d BY |
457 | /* |
458 | * Since request_mem_region() and ioremap() are byte-granularity | |
459 | * there is no need handle anything special like we do when the | |
460 | * vmap() case in persistent_ram_vmap() above. | |
461 | */ | |
027bc8b0 | 462 | return va; |
24c3d2f3 AV |
463 | } |
464 | ||
2b1321e4 | 465 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
027bc8b0 | 466 | struct persistent_ram_zone *prz, int memtype) |
2b1321e4 | 467 | { |
d3b48769 AV |
468 | prz->paddr = start; |
469 | prz->size = size; | |
470 | ||
24c3d2f3 | 471 | if (pfn_valid(start >> PAGE_SHIFT)) |
027bc8b0 | 472 | prz->vaddr = persistent_ram_vmap(start, size, memtype); |
24c3d2f3 | 473 | else |
1227daa4 KC |
474 | prz->vaddr = persistent_ram_iomap(start, size, memtype, |
475 | prz->label); | |
24c3d2f3 | 476 | |
404a6043 | 477 | if (!prz->vaddr) { |
2b1321e4 AV |
478 | pr_err("%s: Failed to map 0x%llx pages at 0x%llx\n", __func__, |
479 | (unsigned long long)size, (unsigned long long)start); | |
404a6043 CC |
480 | return -ENOMEM; |
481 | } | |
482 | ||
831b624d | 483 | prz->buffer = prz->vaddr; |
404a6043 CC |
484 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
f568f6ca | 489 | static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig, |
76d5692a | 490 | struct persistent_ram_ecc_info *ecc_info) |
404a6043 | 491 | { |
bb4206f2 | 492 | int ret; |
7684bd33 | 493 | bool zap = !!(prz->flags & PRZ_FLAG_ZAP_OLD); |
c672528a | 494 | |
c31ad081 | 495 | ret = persistent_ram_init_ecc(prz, ecc_info); |
9cc05ad9 | 496 | if (ret) |
bb4206f2 | 497 | return ret; |
c672528a | 498 | |
cbe7cbf5 AV |
499 | sig ^= PERSISTENT_RAM_SIG; |
500 | ||
501 | if (prz->buffer->sig == sig) { | |
808d0387 | 502 | if (buffer_size(prz) > prz->buffer_size || |
7684bd33 | 503 | buffer_start(prz) > buffer_size(prz)) { |
ef748853 FF |
504 | pr_info("found existing invalid buffer, size %zu, start %zu\n", |
505 | buffer_size(prz), buffer_start(prz)); | |
7684bd33 PW |
506 | zap = true; |
507 | } else { | |
ef748853 FF |
508 | pr_debug("found existing buffer, size %zu, start %zu\n", |
509 | buffer_size(prz), buffer_start(prz)); | |
c672528a CC |
510 | persistent_ram_save_old(prz); |
511 | } | |
512 | } else { | |
ef748853 FF |
513 | pr_debug("no valid data in buffer (sig = 0x%08x)\n", |
514 | prz->buffer->sig); | |
7684bd33 PW |
515 | prz->buffer->sig = sig; |
516 | zap = true; | |
c672528a CC |
517 | } |
518 | ||
7684bd33 PW |
519 | /* Reset missing, invalid, or single-use memory area. */ |
520 | if (zap) | |
521 | persistent_ram_zap(prz); | |
c672528a | 522 | |
bb4206f2 AV |
523 | return 0; |
524 | } | |
525 | ||
d3b48769 AV |
526 | void persistent_ram_free(struct persistent_ram_zone *prz) |
527 | { | |
beeb9432 AV |
528 | if (!prz) |
529 | return; | |
530 | ||
531 | if (prz->vaddr) { | |
532 | if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { | |
831b624d BY |
533 | /* We must vunmap() at page-granularity. */ |
534 | vunmap(prz->vaddr - offset_in_page(prz->paddr)); | |
beeb9432 AV |
535 | } else { |
536 | iounmap(prz->vaddr); | |
537 | release_mem_region(prz->paddr, prz->size); | |
538 | } | |
539 | prz->vaddr = NULL; | |
d3b48769 | 540 | } |
f2531f19 KC |
541 | if (prz->rs_decoder) { |
542 | free_rs(prz->rs_decoder); | |
543 | prz->rs_decoder = NULL; | |
544 | } | |
545 | kfree(prz->ecc_info.par); | |
546 | prz->ecc_info.par = NULL; | |
547 | ||
d3b48769 | 548 | persistent_ram_free_old(prz); |
1227daa4 | 549 | kfree(prz->label); |
d3b48769 AV |
550 | kfree(prz); |
551 | } | |
552 | ||
f568f6ca | 553 | struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size, |
027bc8b0 | 554 | u32 sig, struct persistent_ram_ecc_info *ecc_info, |
1227daa4 | 555 | unsigned int memtype, u32 flags, char *label) |
8cf5aff8 AV |
556 | { |
557 | struct persistent_ram_zone *prz; | |
558 | int ret = -ENOMEM; | |
559 | ||
560 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); | |
561 | if (!prz) { | |
ef748853 | 562 | pr_err("failed to allocate persistent ram zone\n"); |
8cf5aff8 AV |
563 | goto err; |
564 | } | |
565 | ||
76d5692a | 566 | /* Initialize general buffer state. */ |
e9a330c4 | 567 | raw_spin_lock_init(&prz->buffer_lock); |
76d5692a | 568 | prz->flags = flags; |
1227daa4 | 569 | prz->label = label; |
76d5692a | 570 | |
027bc8b0 | 571 | ret = persistent_ram_buffer_map(start, size, prz, memtype); |
8cf5aff8 AV |
572 | if (ret) |
573 | goto err; | |
574 | ||
76d5692a | 575 | ret = persistent_ram_post_init(prz, sig, ecc_info); |
beeb9432 AV |
576 | if (ret) |
577 | goto err; | |
8cf5aff8 AV |
578 | |
579 | return prz; | |
580 | err: | |
beeb9432 | 581 | persistent_ram_free(prz); |
8cf5aff8 AV |
582 | return ERR_PTR(ret); |
583 | } |