Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 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 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 15 | #include <linux/device.h> |
| 16 | #include <linux/err.h> |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 17 | #include <linux/errno.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/io.h> |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 21 | #include <linux/list.h> |
| 22 | #include <linux/memblock.h> |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 23 | #include <linux/rslib.h> |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 24 | #include <linux/slab.h> |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 25 | #include <linux/vmalloc.h> |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 26 | #include "persistent_ram.h" |
| 27 | |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 28 | struct persistent_ram_buffer { |
| 29 | uint32_t sig; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 30 | atomic_t start; |
| 31 | atomic_t size; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 32 | uint8_t data[0]; |
| 33 | }; |
| 34 | |
| 35 | #define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */ |
| 36 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 37 | static __initdata LIST_HEAD(persistent_ram_list); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 38 | |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 39 | static inline size_t buffer_size(struct persistent_ram_zone *prz) |
| 40 | { |
| 41 | return atomic_read(&prz->buffer->size); |
| 42 | } |
| 43 | |
| 44 | static inline size_t buffer_start(struct persistent_ram_zone *prz) |
| 45 | { |
| 46 | return atomic_read(&prz->buffer->start); |
| 47 | } |
| 48 | |
| 49 | /* increase and wrap the start pointer, returning the old value */ |
| 50 | static inline size_t buffer_start_add(struct persistent_ram_zone *prz, size_t a) |
| 51 | { |
| 52 | int old; |
| 53 | int new; |
| 54 | |
| 55 | do { |
| 56 | old = atomic_read(&prz->buffer->start); |
| 57 | new = old + a; |
| 58 | while (unlikely(new > prz->buffer_size)) |
| 59 | new -= prz->buffer_size; |
| 60 | } while (atomic_cmpxchg(&prz->buffer->start, old, new) != old); |
| 61 | |
| 62 | return old; |
| 63 | } |
| 64 | |
| 65 | /* increase the size counter until it hits the max size */ |
| 66 | static inline void buffer_size_add(struct persistent_ram_zone *prz, size_t a) |
| 67 | { |
| 68 | size_t old; |
| 69 | size_t new; |
| 70 | |
| 71 | if (atomic_read(&prz->buffer->size) == prz->buffer_size) |
| 72 | return; |
| 73 | |
| 74 | do { |
| 75 | old = atomic_read(&prz->buffer->size); |
| 76 | new = old + a; |
| 77 | if (new > prz->buffer_size) |
| 78 | new = prz->buffer_size; |
| 79 | } while (atomic_cmpxchg(&prz->buffer->size, old, new) != old); |
| 80 | } |
| 81 | |
Colin Cross | a15d0b3 | 2012-03-07 17:34:36 -0800 | [diff] [blame] | 82 | static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz, |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 83 | uint8_t *data, size_t len, uint8_t *ecc) |
| 84 | { |
| 85 | int i; |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 86 | uint16_t par[prz->ecc_size]; |
| 87 | |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 88 | /* Initialize the parity buffer */ |
| 89 | memset(par, 0, sizeof(par)); |
| 90 | encode_rs8(prz->rs_decoder, data, len, par, 0); |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 91 | for (i = 0; i < prz->ecc_size; i++) |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 92 | ecc[i] = par[i]; |
| 93 | } |
| 94 | |
| 95 | static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, |
| 96 | void *data, size_t len, uint8_t *ecc) |
| 97 | { |
| 98 | int i; |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 99 | uint16_t par[prz->ecc_size]; |
| 100 | |
| 101 | for (i = 0; i < prz->ecc_size; i++) |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 102 | par[i] = ecc[i]; |
| 103 | return decode_rs8(prz->rs_decoder, data, par, len, |
| 104 | NULL, 0, NULL, 0, NULL); |
| 105 | } |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 106 | |
Colin Cross | a15d0b3 | 2012-03-07 17:34:36 -0800 | [diff] [blame] | 107 | static void notrace persistent_ram_update_ecc(struct persistent_ram_zone *prz, |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 108 | unsigned int start, unsigned int count) |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 109 | { |
| 110 | struct persistent_ram_buffer *buffer = prz->buffer; |
| 111 | uint8_t *buffer_end = buffer->data + prz->buffer_size; |
| 112 | uint8_t *block; |
| 113 | uint8_t *par; |
| 114 | int ecc_block_size = prz->ecc_block_size; |
| 115 | int ecc_size = prz->ecc_size; |
| 116 | int size = prz->ecc_block_size; |
| 117 | |
| 118 | if (!prz->ecc) |
| 119 | return; |
| 120 | |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 121 | block = buffer->data + (start & ~(ecc_block_size - 1)); |
| 122 | par = prz->par_buffer + (start / ecc_block_size) * prz->ecc_size; |
| 123 | |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 124 | do { |
| 125 | if (block + ecc_block_size > buffer_end) |
| 126 | size = buffer_end - block; |
| 127 | persistent_ram_encode_rs8(prz, block, size, par); |
| 128 | block += ecc_block_size; |
| 129 | par += ecc_size; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 130 | } while (block < buffer->data + start + count); |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | static void persistent_ram_update_header_ecc(struct persistent_ram_zone *prz) |
| 134 | { |
| 135 | struct persistent_ram_buffer *buffer = prz->buffer; |
| 136 | |
| 137 | if (!prz->ecc) |
| 138 | return; |
| 139 | |
| 140 | persistent_ram_encode_rs8(prz, (uint8_t *)buffer, sizeof(*buffer), |
| 141 | prz->par_header); |
| 142 | } |
| 143 | |
| 144 | static void persistent_ram_ecc_old(struct persistent_ram_zone *prz) |
| 145 | { |
| 146 | struct persistent_ram_buffer *buffer = prz->buffer; |
| 147 | uint8_t *block; |
| 148 | uint8_t *par; |
| 149 | |
| 150 | if (!prz->ecc) |
| 151 | return; |
| 152 | |
| 153 | block = buffer->data; |
| 154 | par = prz->par_buffer; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 155 | while (block < buffer->data + buffer_size(prz)) { |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 156 | int numerr; |
| 157 | int size = prz->ecc_block_size; |
| 158 | if (block + size > buffer->data + prz->buffer_size) |
| 159 | size = buffer->data + prz->buffer_size - block; |
| 160 | numerr = persistent_ram_decode_rs8(prz, block, size, par); |
| 161 | if (numerr > 0) { |
| 162 | pr_devel("persistent_ram: error in block %p, %d\n", |
| 163 | block, numerr); |
| 164 | prz->corrected_bytes += numerr; |
| 165 | } else if (numerr < 0) { |
| 166 | pr_devel("persistent_ram: uncorrectable error in block %p\n", |
| 167 | block); |
| 168 | prz->bad_blocks++; |
| 169 | } |
| 170 | block += prz->ecc_block_size; |
| 171 | par += prz->ecc_size; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | static int persistent_ram_init_ecc(struct persistent_ram_zone *prz, |
| 176 | size_t buffer_size) |
| 177 | { |
| 178 | int numerr; |
| 179 | struct persistent_ram_buffer *buffer = prz->buffer; |
| 180 | int ecc_blocks; |
| 181 | |
| 182 | if (!prz->ecc) |
| 183 | return 0; |
| 184 | |
| 185 | prz->ecc_block_size = 128; |
| 186 | prz->ecc_size = 16; |
| 187 | prz->ecc_symsize = 8; |
| 188 | prz->ecc_poly = 0x11d; |
| 189 | |
| 190 | ecc_blocks = DIV_ROUND_UP(prz->buffer_size, prz->ecc_block_size); |
| 191 | prz->buffer_size -= (ecc_blocks + 1) * prz->ecc_size; |
| 192 | |
| 193 | if (prz->buffer_size > buffer_size) { |
| 194 | pr_err("persistent_ram: invalid size %zu, non-ecc datasize %zu\n", |
| 195 | buffer_size, prz->buffer_size); |
| 196 | return -EINVAL; |
| 197 | } |
| 198 | |
| 199 | prz->par_buffer = buffer->data + prz->buffer_size; |
| 200 | prz->par_header = prz->par_buffer + ecc_blocks * prz->ecc_size; |
| 201 | |
| 202 | /* |
| 203 | * first consecutive root is 0 |
| 204 | * primitive element to generate roots = 1 |
| 205 | */ |
| 206 | prz->rs_decoder = init_rs(prz->ecc_symsize, prz->ecc_poly, 0, 1, |
| 207 | prz->ecc_size); |
| 208 | if (prz->rs_decoder == NULL) { |
| 209 | pr_info("persistent_ram: init_rs failed\n"); |
| 210 | return -EINVAL; |
| 211 | } |
| 212 | |
| 213 | prz->corrected_bytes = 0; |
| 214 | prz->bad_blocks = 0; |
| 215 | |
| 216 | numerr = persistent_ram_decode_rs8(prz, buffer, sizeof(*buffer), |
| 217 | prz->par_header); |
| 218 | if (numerr > 0) { |
| 219 | pr_info("persistent_ram: error in header, %d\n", numerr); |
| 220 | prz->corrected_bytes += numerr; |
| 221 | } else if (numerr < 0) { |
| 222 | pr_info("persistent_ram: uncorrectable error in header\n"); |
| 223 | prz->bad_blocks++; |
| 224 | } |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz, |
| 230 | char *str, size_t len) |
| 231 | { |
| 232 | ssize_t ret; |
| 233 | |
| 234 | if (prz->corrected_bytes || prz->bad_blocks) |
| 235 | ret = snprintf(str, len, "" |
| 236 | "\n%d Corrected bytes, %d unrecoverable blocks\n", |
| 237 | prz->corrected_bytes, prz->bad_blocks); |
| 238 | else |
| 239 | ret = snprintf(str, len, "\nNo errors detected\n"); |
| 240 | |
| 241 | return ret; |
| 242 | } |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 243 | |
Colin Cross | a15d0b3 | 2012-03-07 17:34:36 -0800 | [diff] [blame] | 244 | static void notrace persistent_ram_update(struct persistent_ram_zone *prz, |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 245 | const void *s, unsigned int start, unsigned int count) |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 246 | { |
| 247 | struct persistent_ram_buffer *buffer = prz->buffer; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 248 | memcpy(buffer->data + start, s, count); |
| 249 | persistent_ram_update_ecc(prz, start, count); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | static void __init |
| 253 | persistent_ram_save_old(struct persistent_ram_zone *prz) |
| 254 | { |
| 255 | struct persistent_ram_buffer *buffer = prz->buffer; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 256 | size_t size = buffer_size(prz); |
| 257 | size_t start = buffer_start(prz); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 258 | char *dest; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 259 | |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 260 | persistent_ram_ecc_old(prz); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 261 | |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 262 | dest = kmalloc(size, GFP_KERNEL); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 263 | if (dest == NULL) { |
| 264 | pr_err("persistent_ram: failed to allocate buffer\n"); |
| 265 | return; |
| 266 | } |
| 267 | |
| 268 | prz->old_log = dest; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 269 | prz->old_log_size = size; |
| 270 | memcpy(prz->old_log, &buffer->data[start], size - start); |
| 271 | memcpy(prz->old_log + size - start, &buffer->data[0], start); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 272 | } |
| 273 | |
Colin Cross | a15d0b3 | 2012-03-07 17:34:36 -0800 | [diff] [blame] | 274 | int notrace persistent_ram_write(struct persistent_ram_zone *prz, |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 275 | const void *s, unsigned int count) |
| 276 | { |
| 277 | int rem; |
| 278 | int c = count; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 279 | size_t start; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 280 | |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 281 | if (unlikely(c > prz->buffer_size)) { |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 282 | s += c - prz->buffer_size; |
| 283 | c = prz->buffer_size; |
| 284 | } |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 285 | |
Anton Vorontsov | 484dd30 | 2012-05-11 17:17:17 -0700 | [diff] [blame^] | 286 | buffer_size_add(prz, c); |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 287 | |
| 288 | start = buffer_start_add(prz, c); |
| 289 | |
| 290 | rem = prz->buffer_size - start; |
| 291 | if (unlikely(rem < c)) { |
| 292 | persistent_ram_update(prz, s, start, rem); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 293 | s += rem; |
| 294 | c -= rem; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 295 | start = 0; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 296 | } |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 297 | persistent_ram_update(prz, s, start, c); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 298 | |
Colin Cross | 9cc05ad | 2012-03-07 17:34:33 -0800 | [diff] [blame] | 299 | persistent_ram_update_header_ecc(prz); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 300 | |
| 301 | return count; |
| 302 | } |
| 303 | |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 304 | size_t persistent_ram_old_size(struct persistent_ram_zone *prz) |
| 305 | { |
| 306 | return prz->old_log_size; |
| 307 | } |
| 308 | |
| 309 | void *persistent_ram_old(struct persistent_ram_zone *prz) |
| 310 | { |
| 311 | return prz->old_log; |
| 312 | } |
| 313 | |
| 314 | void persistent_ram_free_old(struct persistent_ram_zone *prz) |
| 315 | { |
| 316 | kfree(prz->old_log); |
| 317 | prz->old_log = NULL; |
| 318 | prz->old_log_size = 0; |
| 319 | } |
| 320 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 321 | static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size, |
| 322 | struct persistent_ram_zone *prz) |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 323 | { |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 324 | struct page **pages; |
| 325 | phys_addr_t page_start; |
| 326 | unsigned int page_count; |
| 327 | pgprot_t prot; |
| 328 | unsigned int i; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 329 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 330 | page_start = start - offset_in_page(start); |
| 331 | page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 332 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 333 | prot = pgprot_noncached(PAGE_KERNEL); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 334 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 335 | pages = kmalloc(sizeof(struct page *) * page_count, GFP_KERNEL); |
| 336 | if (!pages) { |
| 337 | pr_err("%s: Failed to allocate array for %u pages\n", __func__, |
| 338 | page_count); |
| 339 | return -ENOMEM; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 340 | } |
| 341 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 342 | for (i = 0; i < page_count; i++) { |
| 343 | phys_addr_t addr = page_start + i * PAGE_SIZE; |
| 344 | pages[i] = pfn_to_page(addr >> PAGE_SHIFT); |
| 345 | } |
| 346 | prz->vaddr = vmap(pages, page_count, VM_MAP, prot); |
| 347 | kfree(pages); |
| 348 | if (!prz->vaddr) { |
| 349 | pr_err("%s: Failed to map %u pages\n", __func__, page_count); |
| 350 | return -ENOMEM; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 351 | } |
| 352 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 353 | prz->buffer = prz->vaddr + offset_in_page(start); |
| 354 | prz->buffer_size = size - sizeof(struct persistent_ram_buffer); |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 355 | |
| 356 | return 0; |
| 357 | } |
| 358 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 359 | static int __init persistent_ram_buffer_init(const char *name, |
| 360 | struct persistent_ram_zone *prz) |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 361 | { |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 362 | int i; |
| 363 | struct persistent_ram *ram; |
| 364 | struct persistent_ram_descriptor *desc; |
| 365 | phys_addr_t start; |
| 366 | |
| 367 | list_for_each_entry(ram, &persistent_ram_list, node) { |
| 368 | start = ram->start; |
| 369 | for (i = 0; i < ram->num_descs; i++) { |
| 370 | desc = &ram->descs[i]; |
| 371 | if (!strcmp(desc->name, name)) |
| 372 | return persistent_ram_buffer_map(start, |
| 373 | desc->size, prz); |
| 374 | start += desc->size; |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | return -EINVAL; |
| 379 | } |
| 380 | |
| 381 | static __init |
| 382 | struct persistent_ram_zone *__persistent_ram_init(struct device *dev, bool ecc) |
| 383 | { |
| 384 | struct persistent_ram_zone *prz; |
Jesper Juhl | 474a898 | 2012-04-11 22:10:20 +0200 | [diff] [blame] | 385 | int ret = -ENOMEM; |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 386 | |
| 387 | prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL); |
| 388 | if (!prz) { |
| 389 | pr_err("persistent_ram: failed to allocate persistent ram zone\n"); |
Jesper Juhl | 474a898 | 2012-04-11 22:10:20 +0200 | [diff] [blame] | 390 | goto err; |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 391 | } |
| 392 | |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 393 | ret = persistent_ram_buffer_init(dev_name(dev), prz); |
| 394 | if (ret) { |
| 395 | pr_err("persistent_ram: failed to initialize buffer\n"); |
Jesper Juhl | 474a898 | 2012-04-11 22:10:20 +0200 | [diff] [blame] | 396 | goto err; |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | prz->ecc = ecc; |
| 400 | ret = persistent_ram_init_ecc(prz, prz->buffer_size); |
| 401 | if (ret) |
Jesper Juhl | 474a898 | 2012-04-11 22:10:20 +0200 | [diff] [blame] | 402 | goto err; |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 403 | |
| 404 | if (prz->buffer->sig == PERSISTENT_RAM_SIG) { |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 405 | if (buffer_size(prz) > prz->buffer_size || |
| 406 | buffer_start(prz) > buffer_size(prz)) |
| 407 | pr_info("persistent_ram: found existing invalid buffer," |
Randy Dunlap | f56d711 | 2012-03-30 10:31:32 -0700 | [diff] [blame] | 408 | " size %zu, start %zu\n", |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 409 | buffer_size(prz), buffer_start(prz)); |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 410 | else { |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 411 | pr_info("persistent_ram: found existing buffer," |
Randy Dunlap | f56d711 | 2012-03-30 10:31:32 -0700 | [diff] [blame] | 412 | " size %zu, start %zu\n", |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 413 | buffer_size(prz), buffer_start(prz)); |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 414 | persistent_ram_save_old(prz); |
| 415 | } |
| 416 | } else { |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 417 | pr_info("persistent_ram: no valid data in buffer" |
| 418 | " (sig = 0x%08x)\n", prz->buffer->sig); |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | prz->buffer->sig = PERSISTENT_RAM_SIG; |
Colin Cross | 808d038 | 2012-03-07 17:34:35 -0800 | [diff] [blame] | 422 | atomic_set(&prz->buffer->start, 0); |
| 423 | atomic_set(&prz->buffer->size, 0); |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 424 | |
| 425 | return prz; |
Jesper Juhl | 474a898 | 2012-04-11 22:10:20 +0200 | [diff] [blame] | 426 | err: |
| 427 | kfree(prz); |
| 428 | return ERR_PTR(ret); |
Colin Cross | 404a604 | 2012-03-07 17:34:34 -0800 | [diff] [blame] | 429 | } |
| 430 | |
| 431 | struct persistent_ram_zone * __init |
| 432 | persistent_ram_init_ringbuffer(struct device *dev, bool ecc) |
| 433 | { |
| 434 | return __persistent_ram_init(dev, ecc); |
| 435 | } |
| 436 | |
| 437 | int __init persistent_ram_early_init(struct persistent_ram *ram) |
| 438 | { |
| 439 | int ret; |
| 440 | |
| 441 | ret = memblock_reserve(ram->start, ram->size); |
| 442 | if (ret) { |
| 443 | pr_err("Failed to reserve persistent memory from %08lx-%08lx\n", |
| 444 | (long)ram->start, (long)(ram->start + ram->size - 1)); |
| 445 | return ret; |
| 446 | } |
| 447 | |
| 448 | list_add_tail(&ram->node, &persistent_ram_list); |
| 449 | |
| 450 | pr_info("Initialized persistent memory from %08lx-%08lx\n", |
| 451 | (long)ram->start, (long)(ram->start + ram->size - 1)); |
| 452 | |
| 453 | return 0; |
Colin Cross | c672528 | 2012-03-07 17:34:32 -0800 | [diff] [blame] | 454 | } |