Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2012 The ChromiumOS Authors. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #include <arch/acpi.h> |
| 21 | #include <console/console.h> |
| 22 | #include <pc80/mc146818rtc.h> |
Duncan Laurie | 472ec9c | 2012-06-23 16:13:42 -0700 | [diff] [blame] | 23 | #include <smbios.h> |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 24 | #include <spi.h> |
| 25 | #include <spi_flash.h> |
| 26 | #include <stdint.h> |
| 27 | #include <string.h> |
| 28 | #include <elog.h> |
| 29 | #include "elog_internal.h" |
| 30 | |
Duncan Laurie | 86bf3f5 | 2012-08-15 13:14:58 -0700 | [diff] [blame] | 31 | #if CONFIG_CHROMEOS |
| 32 | #include <vendorcode/google/chromeos/fmap.h> |
| 33 | #elif CONFIG_ELOG_FLASH_BASE == 0 |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 34 | #error "CONFIG_ELOG_FLASH_BASE is invalid" |
| 35 | #endif |
| 36 | #if CONFIG_ELOG_FULL_THRESHOLD >= CONFIG_ELOG_AREA_SIZE |
| 37 | #error "CONFIG_ELOG_FULL_THRESHOLD is larger than CONFIG_ELOG_AREA_SIZE" |
| 38 | #endif |
| 39 | #if (CONFIG_ELOG_AREA_SIZE - CONFIG_ELOG_FULL_THRESHOLD) < (MAX_EVENT_SIZE + 1) |
| 40 | #error "CONFIG_ELOG_FULL_THRESHOLD is too small" |
| 41 | #endif |
| 42 | #if CONFIG_ELOG_SHRINK_SIZE >= CONFIG_ELOG_AREA_SIZE |
| 43 | #error "CONFIG_ELOG_SHRINK_SIZE is larger than CONFIG_ELOG_AREA_SIZE" |
| 44 | #endif |
| 45 | #if (CONFIG_ELOG_AREA_SIZE - CONFIG_ELOG_SHRINK_SIZE) > \ |
| 46 | CONFIG_ELOG_FULL_THRESHOLD |
| 47 | #error "CONFIG_ELOG_SHRINK_SIZE is too large" |
| 48 | #endif |
| 49 | |
| 50 | #if CONFIG_ELOG_DEBUG |
| 51 | #define elog_debug(STR...) printk(BIOS_DEBUG, STR) |
| 52 | #else |
| 53 | #define elog_debug(STR...) |
| 54 | #endif |
| 55 | |
| 56 | /* |
| 57 | * Static variables for ELOG state |
| 58 | */ |
| 59 | static int elog_initialized; |
| 60 | static struct spi_flash *elog_spi; |
| 61 | static struct elog_descriptor elog_flash_area; |
| 62 | static struct elog_descriptor elog_mem_area; |
| 63 | |
| 64 | static inline struct elog_descriptor* elog_get_mem(void) |
| 65 | { |
| 66 | return &elog_mem_area; |
| 67 | } |
| 68 | |
| 69 | static inline struct elog_descriptor* elog_get_flash(void) |
| 70 | { |
| 71 | return &elog_flash_area; |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Convert a memory mapped flash address into a flash offset |
| 76 | */ |
| 77 | static inline u32 elog_flash_address_to_offset(u8 *address) |
| 78 | { |
| 79 | if (!elog_spi) |
| 80 | return 0; |
| 81 | return (u32)address - ((u32)~0UL - elog_spi->size + 1); |
| 82 | } |
| 83 | |
| 84 | /* |
| 85 | * Convert a flash offset into a memory mapped flash address |
| 86 | */ |
| 87 | static inline u8* elog_flash_offset_to_address(u32 offset) |
| 88 | { |
| 89 | if (!elog_spi) |
| 90 | return NULL; |
| 91 | return (u8*)((u32)~0UL - elog_spi->size + 1 + offset); |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * The ELOG header is at the very beginning of the area |
| 96 | */ |
| 97 | static inline struct elog_header* |
| 98 | elog_get_header(struct elog_descriptor *elog) |
| 99 | { |
| 100 | return elog->backing_store; |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Pointer to an event log header in the event data area |
| 105 | */ |
| 106 | static inline struct event_header* |
| 107 | elog_get_event_base(struct elog_descriptor *elog, u32 offset) |
| 108 | { |
| 109 | return (struct event_header *)&elog->data[offset]; |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Pointer to where the next event should be stored |
| 114 | */ |
| 115 | static inline struct event_header* |
| 116 | elog_get_next_event_base(struct elog_descriptor *elog) |
| 117 | { |
| 118 | return elog_get_event_base(elog, elog->next_event_offset); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Pointer to the last logged event |
| 123 | */ |
| 124 | static inline struct event_header* |
| 125 | elog_get_last_event_base(struct elog_descriptor *elog) |
| 126 | { |
| 127 | return elog_get_event_base(elog, elog->last_event_offset); |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * Update the checksum at the last byte |
| 132 | */ |
| 133 | static void elog_update_checksum(struct event_header *event, u8 checksum) |
| 134 | { |
| 135 | u8 *event_data = (u8*)event; |
| 136 | event_data[event->length - 1] = checksum; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Simple byte checksum for events |
| 141 | */ |
| 142 | static u8 elog_checksum_event(struct event_header *event) |
| 143 | { |
| 144 | u8 index, checksum = 0; |
| 145 | u8 *data = (u8*)event; |
| 146 | |
| 147 | for (index = 0; index < event->length; index++) |
| 148 | checksum += data[index]; |
| 149 | return checksum; |
| 150 | } |
| 151 | |
| 152 | /* |
| 153 | * Check if a raw buffer is filled with ELOG_TYPE_EOL byte |
| 154 | */ |
| 155 | static int elog_is_buffer_clear(u8 *base, u32 size) |
| 156 | { |
| 157 | u8 *current = base; |
| 158 | u8 *end = current + size; |
| 159 | |
| 160 | elog_debug("elog_is_buffer_clear(base=0x%p size=%u)\n", base, size); |
| 161 | |
| 162 | for (; current != end; current++) { |
| 163 | if (*current != ELOG_TYPE_EOL) |
| 164 | return 0; |
| 165 | } |
| 166 | return 1; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Verify whether ELOG area is filled with ELOG_TYPE_EOL byte |
| 171 | */ |
| 172 | static int elog_is_area_clear(struct elog_descriptor *elog) |
| 173 | { |
| 174 | return elog_is_buffer_clear(elog->backing_store, elog->total_size); |
| 175 | } |
| 176 | |
| 177 | /* |
| 178 | * Check that the ELOG area has been initialized and is valid. |
| 179 | */ |
| 180 | static int elog_is_area_valid(struct elog_descriptor *elog) |
| 181 | { |
| 182 | elog_debug("elog_is_area_valid()\n"); |
| 183 | |
| 184 | if (elog->area_state != ELOG_AREA_HAS_CONTENT) |
| 185 | return 0; |
| 186 | if (elog->header_state != ELOG_HEADER_VALID) |
| 187 | return 0; |
| 188 | if (elog->event_buffer_state != ELOG_EVENT_BUFFER_OK) |
| 189 | return 0; |
| 190 | return 1; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Verify the contents of an ELOG Header structure |
| 195 | * Returns 1 if the header is valid, 0 otherwise |
| 196 | */ |
| 197 | static int elog_is_header_valid(struct elog_header *header) |
| 198 | { |
| 199 | elog_debug("elog_is_header_valid()\n"); |
| 200 | |
| 201 | if (header->magic != ELOG_SIGNATURE) { |
| 202 | printk(BIOS_ERR, "ELOG: header magic 0x%X != 0x%X\n", |
| 203 | header->magic, ELOG_SIGNATURE); |
| 204 | return 0; |
| 205 | } |
| 206 | if (header->version != ELOG_VERSION) { |
| 207 | printk(BIOS_ERR, "ELOG: header version %u != %u\n", |
| 208 | header->version, ELOG_VERSION); |
| 209 | return 0; |
| 210 | } |
| 211 | if (header->header_size != sizeof(*header)) { |
| 212 | printk(BIOS_ERR, "ELOG: header size mismatch %u != %u\n", |
| 213 | header->header_size, sizeof(*header)); |
| 214 | return 0; |
| 215 | } |
| 216 | return 1; |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Validate the event header and data. |
| 221 | */ |
| 222 | static int elog_is_event_valid(struct elog_descriptor *elog, u32 offset) |
| 223 | { |
| 224 | struct event_header *event; |
| 225 | |
| 226 | event = elog_get_event_base(elog, offset); |
| 227 | if (!event) |
| 228 | return 0; |
| 229 | |
| 230 | /* Validate event length */ |
| 231 | if ((offsetof(struct event_header, type) + |
| 232 | sizeof(event->type) - 1 + offset) >= elog->data_size) |
| 233 | return 0; |
| 234 | |
| 235 | /* End of event marker has been found */ |
| 236 | if (event->type == ELOG_TYPE_EOL) |
| 237 | return 0; |
| 238 | |
| 239 | /* Check if event fits in area */ |
| 240 | if ((offsetof(struct event_header, length) + |
| 241 | sizeof(event->length) - 1 + offset) >= elog->data_size) |
| 242 | return 0; |
| 243 | |
| 244 | /* |
| 245 | * If the current event length + the current offset exceeds |
| 246 | * the area size then the event area is corrupt. |
| 247 | */ |
| 248 | if ((event->length + offset) >= elog->data_size) |
| 249 | return 0; |
| 250 | |
| 251 | /* Event length must be at least header size + checksum */ |
| 252 | if (event->length < (sizeof(*event) + 1)) |
| 253 | return 0; |
| 254 | |
| 255 | /* If event checksum is invalid the area is corrupt */ |
| 256 | if (elog_checksum_event(event) != 0) |
| 257 | return 0; |
| 258 | |
| 259 | /* Event is valid */ |
| 260 | return 1; |
| 261 | } |
| 262 | |
| 263 | /* |
| 264 | * Write 'size' bytes of data provided in 'buffer' into flash |
| 265 | * device at offset 'offset'. This will not erase the flash and |
| 266 | * it assumes the flash area is erased appropriately. |
| 267 | */ |
| 268 | static void elog_flash_write(u8 *address, u8 *buffer, u32 size) |
| 269 | { |
| 270 | u32 offset; |
| 271 | |
| 272 | if (!address || !buffer || !size || !elog_spi) |
| 273 | return; |
| 274 | |
| 275 | offset = elog_flash_address_to_offset(address); |
| 276 | |
| 277 | elog_debug("elog_flash_write(address=0x%p offset=0x%08x buffer=0x%p " |
| 278 | "size=%u)\n", address, offset, buffer, size); |
| 279 | |
| 280 | /* Write the data to flash */ |
| 281 | elog_spi->write(elog_spi, offset, size, buffer); |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Erase the first block specified in the address. |
| 286 | * Only handles flash area within a single flash block. |
| 287 | */ |
| 288 | static void elog_flash_erase(u8 *address, u32 size) |
| 289 | { |
| 290 | u32 offset; |
| 291 | |
| 292 | if (!address || !size || !elog_spi) |
| 293 | return; |
| 294 | |
| 295 | offset = elog_flash_address_to_offset(address); |
| 296 | |
| 297 | elog_debug("elog_flash_erase(address=0x%p offset=0x%08x size=%u)\n", |
| 298 | address, offset, size); |
| 299 | |
| 300 | /* Erase the sectors in this region */ |
| 301 | elog_spi->erase(elog_spi, offset, size); |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Scan the event area and validate each entry and |
| 306 | * update the ELOG descriptor state. |
| 307 | */ |
| 308 | static void elog_update_event_buffer_state(struct elog_descriptor *elog) |
| 309 | { |
| 310 | u32 count = 0; |
| 311 | u32 offset = 0; |
| 312 | u32 last_offset = 0; |
| 313 | u32 last_event_size = 0; |
| 314 | struct event_header *event; |
| 315 | |
| 316 | elog_debug("elog_update_event_buffer_state()\n"); |
| 317 | |
| 318 | /* Go through each event and validate it */ |
| 319 | while (1) { |
| 320 | event = elog_get_event_base(elog, offset); |
| 321 | |
| 322 | /* Do not de-reference anything past the area length */ |
| 323 | if ((offsetof(struct event_header, type) + |
| 324 | sizeof(event->type) - 1 + offset) >= elog->data_size) { |
| 325 | elog->event_buffer_state = ELOG_EVENT_BUFFER_CORRUPTED; |
| 326 | break; |
| 327 | } |
| 328 | |
| 329 | /* The end of the event marker has been found */ |
| 330 | if (event->type == ELOG_TYPE_EOL) |
| 331 | break; |
| 332 | |
| 333 | /* Validate the event */ |
| 334 | if (!elog_is_event_valid(elog, offset)) { |
| 335 | elog->event_buffer_state = ELOG_EVENT_BUFFER_CORRUPTED; |
| 336 | break; |
| 337 | } |
| 338 | |
| 339 | /* Move to the next event */ |
| 340 | count++; |
| 341 | last_offset = offset; |
| 342 | last_event_size = event->length; |
| 343 | offset += event->length; |
| 344 | } |
| 345 | |
| 346 | /* Ensure the remaining buffer is empty */ |
| 347 | if (!elog_is_buffer_clear(&elog->data[offset], |
| 348 | elog->data_size - offset)) |
| 349 | elog->event_buffer_state = ELOG_EVENT_BUFFER_CORRUPTED; |
| 350 | |
| 351 | /* Update data into elog descriptor */ |
| 352 | elog->event_count = count; |
| 353 | elog->next_event_offset = offset; |
| 354 | elog->last_event_offset = last_offset; |
| 355 | elog->last_event_size = last_event_size; |
| 356 | } |
| 357 | |
| 358 | static void elog_validate_and_fill(struct elog_descriptor *elog) |
| 359 | { |
| 360 | elog_debug("elog_validate_and_fill()\n"); |
| 361 | |
| 362 | /* Check if the area is empty or not */ |
| 363 | if (elog_is_area_clear(elog)) { |
| 364 | elog->area_state = ELOG_AREA_EMPTY; |
| 365 | return; |
| 366 | } |
| 367 | |
| 368 | elog->area_state = ELOG_AREA_HAS_CONTENT; |
| 369 | |
| 370 | /* Validate the header */ |
| 371 | if (!elog_is_header_valid(elog->staging_header)) { |
| 372 | elog->header_state = ELOG_HEADER_INVALID; |
| 373 | return; |
| 374 | } |
| 375 | |
| 376 | elog->header_state = ELOG_HEADER_VALID; |
| 377 | elog_update_event_buffer_state(elog); |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * Initialize a new ELOG descriptor |
| 382 | */ |
| 383 | static void elog_init_descriptor(struct elog_descriptor *elog, |
| 384 | elog_descriptor_type type, |
| 385 | u8 *buffer, u32 size, |
| 386 | struct elog_header *header) |
| 387 | { |
| 388 | elog_debug("elog_init_descriptor(type=%u buffer=0x%p size=%u)\n", |
| 389 | type, buffer, size); |
| 390 | |
| 391 | elog->type = type; |
| 392 | elog->area_state = ELOG_AREA_UNDEFINED; |
| 393 | elog->header_state = ELOG_HEADER_INVALID; |
| 394 | elog->event_buffer_state = ELOG_EVENT_BUFFER_OK; |
| 395 | elog->backing_store = buffer; |
| 396 | elog->total_size = size; |
| 397 | |
| 398 | /* Get staging header from backing store */ |
| 399 | elog->staging_header = header; |
| 400 | memcpy(header, buffer, sizeof(struct elog_header)); |
| 401 | |
| 402 | /* Data starts immediately after header */ |
| 403 | elog->data = &buffer[sizeof(struct elog_header)]; |
| 404 | elog->data_size = size - sizeof(struct elog_header); |
| 405 | |
| 406 | elog->next_event_offset = 0; |
| 407 | elog->last_event_offset = 0; |
| 408 | elog->last_event_size = 0; |
| 409 | elog->event_count = 0; |
| 410 | |
| 411 | elog_validate_and_fill(elog); |
| 412 | } |
| 413 | |
| 414 | /* |
| 415 | * Re-initialize an existing ELOG descriptor |
| 416 | */ |
| 417 | static void elog_reinit_descriptor(struct elog_descriptor *elog) |
| 418 | { |
| 419 | elog_debug("elog_reinit_descriptor()\n"); |
| 420 | elog_init_descriptor(elog, elog->type, elog->backing_store, |
| 421 | elog->total_size, elog->staging_header); |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | * Create ELOG descriptor data structures for all ELOG areas. |
| 426 | */ |
| 427 | static int elog_setup_descriptors(u32 flash_base, u32 area_size) |
| 428 | { |
| 429 | struct elog_header *staging_header; |
| 430 | u8 *area; |
| 431 | |
| 432 | elog_debug("elog_setup_descriptors(base=0x%08x size=%u)\n", |
| 433 | flash_base, area_size); |
| 434 | |
| 435 | /* Prepare flash descriptors */ |
| 436 | if (flash_base == 0) { |
| 437 | printk(BIOS_ERR, "ELOG: Invalid flash base\n"); |
| 438 | return -1; |
| 439 | } |
| 440 | |
| 441 | staging_header = malloc(sizeof(struct elog_header)); |
| 442 | if (!staging_header) { |
| 443 | printk(BIOS_ERR, "ELOG: Unable to allocate header\n"); |
| 444 | return -1; |
| 445 | } |
| 446 | |
| 447 | area = elog_flash_offset_to_address(flash_base); |
| 448 | if (!area) { |
| 449 | printk(BIOS_ERR, "ELOG: Unable to determine flash address\n"); |
| 450 | return -1; |
| 451 | } |
| 452 | elog_init_descriptor(elog_get_flash(), ELOG_DESCRIPTOR_FLASH, |
| 453 | area, area_size, staging_header); |
| 454 | |
| 455 | /* Initialize the memory area to look like a cleared flash area */ |
| 456 | area = malloc(area_size); |
| 457 | if (!area) { |
| 458 | printk(BIOS_ERR, "ELOG: Unable to allocate mem area\n"); |
| 459 | return -1; |
| 460 | } |
| 461 | memset(area, ELOG_TYPE_EOL, area_size); |
| 462 | elog_init_descriptor(elog_get_mem(), ELOG_DESCRIPTOR_MEMORY, |
| 463 | area, area_size, (struct elog_header *)area); |
| 464 | |
| 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | static void elog_flash_erase_area(void) |
| 469 | { |
| 470 | struct elog_descriptor *elog = elog_get_flash(); |
| 471 | |
| 472 | elog_debug("elog_flash_erase_area()\n"); |
| 473 | |
| 474 | elog_flash_erase(elog->backing_store, elog->total_size); |
| 475 | elog_reinit_descriptor(elog); |
| 476 | } |
| 477 | |
| 478 | static void elog_prepare_empty(struct elog_descriptor *elog, |
| 479 | u8 *data, u32 data_size) |
| 480 | { |
| 481 | struct elog_header *header; |
| 482 | |
| 483 | elog_debug("elog_prepare_empty(%u bytes)\n", data_size); |
| 484 | |
| 485 | if (!elog_is_area_clear(elog)) |
| 486 | return; |
| 487 | |
| 488 | /* Write out the header */ |
| 489 | header = elog->staging_header; |
| 490 | header->magic = ELOG_SIGNATURE; |
| 491 | header->version = ELOG_VERSION; |
| 492 | header->header_size = sizeof(struct elog_header); |
| 493 | header->reserved[0] = ELOG_TYPE_EOL; |
| 494 | header->reserved[1] = ELOG_TYPE_EOL; |
| 495 | elog_flash_write(elog->backing_store, (u8*)header, |
| 496 | header->header_size); |
| 497 | |
| 498 | /* Write out the data */ |
| 499 | if (data) |
| 500 | elog_flash_write(elog->data, data, data_size); |
| 501 | |
| 502 | elog_reinit_descriptor(elog); |
| 503 | |
| 504 | /* Clear the log if corrupt */ |
| 505 | if (!elog_is_area_valid(elog)) |
| 506 | elog_flash_erase_area(); |
| 507 | } |
| 508 | |
| 509 | static int elog_sync_flash_to_mem(void) |
| 510 | { |
| 511 | struct elog_descriptor *mem = elog_get_mem(); |
| 512 | struct elog_descriptor *flash = elog_get_flash(); |
| 513 | |
| 514 | elog_debug("elog_sync_flash_to_mem()\n"); |
| 515 | |
| 516 | /* Fill with empty pattern first */ |
| 517 | memset(mem->backing_store, ELOG_TYPE_EOL, mem->total_size); |
| 518 | |
| 519 | /* Copy the header to memory */ |
| 520 | memcpy(mem->backing_store, flash->backing_store, |
| 521 | sizeof(struct elog_header)); |
| 522 | |
| 523 | /* Copy the valid flash contents to memory */ |
| 524 | memcpy(mem->data, flash->data, flash->next_event_offset); |
| 525 | |
| 526 | elog_reinit_descriptor(mem); |
| 527 | |
| 528 | return elog_is_area_valid(mem) ? 0 : -1; |
| 529 | } |
| 530 | |
| 531 | static int elog_sync_mem_to_flash(void) |
| 532 | { |
| 533 | struct elog_descriptor *mem = elog_get_mem(); |
| 534 | struct elog_descriptor *flash = elog_get_flash(); |
| 535 | u8 *src, *dest; |
| 536 | u32 size; |
| 537 | |
| 538 | elog_debug("elog_sync_mem_to_flash()\n"); |
| 539 | |
| 540 | /* |
| 541 | * In the case of a BIOS flash the active area will be cleared. |
| 542 | * One can catch this case and log the proper shutdown event by |
| 543 | * checking if the active flash elog is empty. Note that if the |
| 544 | * header size changes we will have corrupted the flash area. |
| 545 | * However that will be corrected on the next boot. |
| 546 | */ |
| 547 | if (elog_is_area_clear(flash)) { |
| 548 | elog_prepare_empty(flash, |
| 549 | (u8*)elog_get_last_event_base(mem), |
| 550 | mem->last_event_size); |
| 551 | elog_sync_flash_to_mem(); |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | /* Calculate the destination and source bases */ |
| 556 | dest = (u8*)elog_get_next_event_base(flash); |
| 557 | src = (u8*)elog_get_event_base(mem, flash->next_event_offset); |
| 558 | |
| 559 | /* Calculate how much data to sync */ |
| 560 | size = mem->next_event_offset - flash->next_event_offset; |
| 561 | |
| 562 | /* Write the log data */ |
| 563 | elog_flash_write(dest, src, size); |
| 564 | |
| 565 | /* Update descriptor */ |
| 566 | flash->event_count = mem->event_count; |
| 567 | flash->next_event_offset = mem->next_event_offset; |
| 568 | flash->last_event_offset = mem->last_event_offset; |
| 569 | flash->last_event_size = mem->last_event_size; |
| 570 | |
| 571 | return 0; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Called during ELOG entry handler to prepare state for flash. |
| 576 | */ |
| 577 | static int elog_flash_area_bootstrap(void) |
| 578 | { |
| 579 | struct elog_descriptor *elog = elog_get_flash(); |
| 580 | |
| 581 | elog_debug("elog_flash_area_bootstrap()\n"); |
| 582 | |
| 583 | switch (elog->area_state) { |
| 584 | case ELOG_AREA_UNDEFINED: |
| 585 | printk(BIOS_ERR, "ELOG: flash area undefined\n"); |
| 586 | return -1; |
| 587 | |
| 588 | case ELOG_AREA_EMPTY: |
| 589 | /* Write a new header with no data */ |
| 590 | elog_prepare_empty(elog, NULL, 0); |
| 591 | break; |
| 592 | |
| 593 | case ELOG_AREA_HAS_CONTENT: |
| 594 | break; |
| 595 | } |
| 596 | |
| 597 | if (elog->header_state == ELOG_HEADER_INVALID) { |
| 598 | /* If the header is invalid no events can be salvaged |
| 599 | * so erase the entire area. */ |
| 600 | printk(BIOS_ERR, "ELOG: flash area header invalid\n"); |
| 601 | elog_flash_erase_area(); |
| 602 | elog_prepare_empty(elog, NULL, 0); |
| 603 | } |
| 604 | |
| 605 | if (elog->event_buffer_state == ELOG_EVENT_BUFFER_CORRUPTED) { |
| 606 | /* Wipe the source flash area */ |
| 607 | elog_flash_erase_area(); |
| 608 | elog_prepare_empty(elog, elog_get_mem()->data, |
| 609 | elog_get_mem()->next_event_offset); |
| 610 | } |
| 611 | |
| 612 | return 0; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Shrink the log, deleting old entries and moving the |
| 617 | * remining ones to the front of the log. |
| 618 | */ |
| 619 | static int elog_shrink(void) |
| 620 | { |
| 621 | struct elog_descriptor *mem = elog_get_mem(); |
| 622 | struct event_header *event; |
| 623 | u16 discard_count = 0; |
| 624 | u16 offset = 0; |
| 625 | |
| 626 | elog_debug("elog_shrink()\n"); |
| 627 | |
| 628 | if (mem->next_event_offset < CONFIG_ELOG_SHRINK_SIZE) |
| 629 | return 0; |
| 630 | |
| 631 | while (1) { |
| 632 | /* Next event has exceeded constraints */ |
| 633 | if (offset > CONFIG_ELOG_SHRINK_SIZE) |
| 634 | break; |
| 635 | |
| 636 | event = elog_get_event_base(mem, offset); |
| 637 | |
| 638 | /* Reached the end of the area */ |
| 639 | if (!event || event->type == ELOG_TYPE_EOL) |
| 640 | break; |
| 641 | |
| 642 | offset += event->length; |
| 643 | discard_count++; |
| 644 | } |
| 645 | |
| 646 | /* Erase flash area */ |
| 647 | elog_flash_erase_area(); |
| 648 | |
| 649 | /* Write new flash area */ |
| 650 | elog_prepare_empty(elog_get_flash(), |
| 651 | (u8*)elog_get_event_base(mem, offset), |
| 652 | mem->next_event_offset - offset); |
| 653 | |
| 654 | /* Update memory area from flash */ |
| 655 | if (elog_sync_flash_to_mem() < 0) { |
| 656 | printk(BIOS_ERR, "Unable to update memory area from flash\n"); |
| 657 | return -1; |
| 658 | } |
| 659 | |
| 660 | /* Add clear event */ |
| 661 | elog_add_event_word(ELOG_TYPE_LOG_CLEAR, offset); |
| 662 | |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | /* |
| 667 | * Initialize the SPI bus and probe for a flash chip |
| 668 | */ |
| 669 | static int elog_spi_init(void) |
| 670 | { |
| 671 | elog_debug("elog_spi_init()\n"); |
| 672 | |
| 673 | /* Prepare SPI subsystem */ |
| 674 | spi_init(); |
| 675 | |
| 676 | /* Look for flash chip */ |
| 677 | elog_spi = spi_flash_probe(0, 0, 0, 0); |
| 678 | |
| 679 | return elog_spi ? 0 : -1; |
| 680 | } |
| 681 | |
| 682 | /* |
Duncan Laurie | 472ec9c | 2012-06-23 16:13:42 -0700 | [diff] [blame] | 683 | * Fill out SMBIOS Type 15 table entry so the |
| 684 | * event log can be discovered at runtime. |
| 685 | */ |
| 686 | int elog_smbios_write_type15(unsigned long *current, int handle) |
| 687 | { |
| 688 | struct smbios_type15 *t = (struct smbios_type15 *)*current; |
| 689 | int len = sizeof(struct smbios_type15); |
| 690 | |
| 691 | memset(t, 0, len); |
| 692 | t->type = SMBIOS_EVENT_LOG; |
| 693 | t->length = len - 2; |
| 694 | t->handle = handle; |
| 695 | t->area_length = elog_get_flash()->total_size - 1; |
| 696 | t->header_offset = 0; |
| 697 | t->data_offset = sizeof(struct elog_header); |
| 698 | t->access_method = SMBIOS_EVENTLOG_ACCESS_METHOD_MMIO32; |
| 699 | t->log_status = SMBIOS_EVENTLOG_STATUS_VALID; |
| 700 | t->change_token = 0; |
| 701 | t->address = (u32)elog_get_flash()->backing_store; |
| 702 | t->header_format = ELOG_HEADER_TYPE_OEM; |
| 703 | t->log_type_descriptors = 0; |
| 704 | t->log_type_descriptor_length = 2; |
| 705 | |
| 706 | *current += len; |
| 707 | return len; |
| 708 | } |
| 709 | |
| 710 | /* |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 711 | * Clear the entire event log |
| 712 | */ |
| 713 | int elog_clear(void) |
| 714 | { |
| 715 | struct elog_descriptor *flash = elog_get_flash(); |
| 716 | |
| 717 | elog_debug("elog_clear()\n"); |
| 718 | |
| 719 | /* Erase flash area */ |
| 720 | elog_flash_erase_area(); |
| 721 | |
| 722 | /* Prepare new empty area */ |
| 723 | elog_prepare_empty(flash, NULL, 0); |
| 724 | |
| 725 | /* Update memory area from flash */ |
| 726 | if (elog_sync_flash_to_mem() < 0) |
| 727 | return -1; |
| 728 | |
| 729 | /* Log the clear event */ |
| 730 | elog_add_event_word(ELOG_TYPE_LOG_CLEAR, flash->total_size); |
| 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * Event log main entry point |
| 737 | */ |
| 738 | int elog_init(void) |
| 739 | { |
Duncan Laurie | 86bf3f5 | 2012-08-15 13:14:58 -0700 | [diff] [blame] | 740 | u32 flash_base = CONFIG_ELOG_FLASH_BASE; |
| 741 | int flash_size = CONFIG_ELOG_AREA_SIZE; |
| 742 | #if CONFIG_CHROMEOS |
| 743 | u8 *flash_base_ptr; |
| 744 | #endif |
| 745 | |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 746 | if (elog_initialized) |
| 747 | return 0; |
| 748 | |
| 749 | elog_debug("elog_init()\n"); |
| 750 | |
| 751 | /* Find SPI flash chip for backing store */ |
| 752 | if (elog_spi_init() < 0) { |
| 753 | printk(BIOS_ERR, "ELOG: Unable to find SPI flash\n"); |
| 754 | return -1; |
| 755 | } |
| 756 | |
Duncan Laurie | 86bf3f5 | 2012-08-15 13:14:58 -0700 | [diff] [blame] | 757 | #if CONFIG_CHROMEOS |
| 758 | /* Find the ELOG base and size in FMAP */ |
| 759 | flash_size = find_fmap_entry("RW_ELOG", (void **)&flash_base_ptr); |
| 760 | if (flash_size < 0) { |
| 761 | printk(BIOS_WARNING, "ELOG: Unable to find RW_ELOG in FMAP, " |
| 762 | "using CONFIG_ELOG_FLASH_BASE instead\n"); |
| 763 | flash_size = CONFIG_ELOG_AREA_SIZE; |
| 764 | } else { |
| 765 | flash_base = elog_flash_address_to_offset(flash_base_ptr); |
| 766 | |
| 767 | /* Use configured size if smaller than FMAP size */ |
| 768 | if (flash_size > CONFIG_ELOG_AREA_SIZE) |
| 769 | flash_size = CONFIG_ELOG_AREA_SIZE; |
| 770 | } |
| 771 | #endif |
| 772 | |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 773 | /* Setup descriptors for flash and memory areas */ |
Duncan Laurie | 86bf3f5 | 2012-08-15 13:14:58 -0700 | [diff] [blame] | 774 | if (elog_setup_descriptors(flash_base, flash_size) < 0) { |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 775 | printk(BIOS_ERR, "ELOG: Unable to initialize descriptors\n"); |
| 776 | return -1; |
| 777 | } |
| 778 | |
| 779 | /* Bootstrap the flash area */ |
| 780 | if (elog_flash_area_bootstrap() < 0) { |
| 781 | printk(BIOS_ERR, "ELOG: Unable to bootstrap flash area\n"); |
| 782 | return -1; |
| 783 | } |
| 784 | |
| 785 | /* Initialize the memory area */ |
| 786 | if (elog_sync_flash_to_mem() < 0) { |
| 787 | printk(BIOS_ERR, "ELOG: Unable to initialize memory area\n"); |
| 788 | return -1; |
| 789 | } |
| 790 | |
| 791 | elog_initialized = 1; |
| 792 | |
| 793 | printk(BIOS_INFO, "ELOG: MEM @0x%p FLASH @0x%p\n", |
| 794 | elog_get_mem()->backing_store, |
| 795 | elog_get_flash()->backing_store); |
| 796 | |
| 797 | printk(BIOS_INFO, "ELOG: areas are %d bytes, full threshold %d," |
| 798 | " shrink size %d\n", CONFIG_ELOG_AREA_SIZE, |
| 799 | CONFIG_ELOG_FULL_THRESHOLD, CONFIG_ELOG_SHRINK_SIZE); |
| 800 | |
| 801 | /* Log a clear event if necessary */ |
| 802 | if (elog_get_flash()->event_count == 0) |
| 803 | elog_add_event_word(ELOG_TYPE_LOG_CLEAR, |
| 804 | elog_get_flash()->total_size); |
| 805 | |
Duncan Laurie | 5c88c6f | 2012-09-01 14:00:23 -0700 | [diff] [blame^] | 806 | /* Shrink the log if we are getting too full */ |
| 807 | if (elog_get_mem()->next_event_offset >= CONFIG_ELOG_FULL_THRESHOLD) |
| 808 | elog_shrink(); |
| 809 | |
Duncan Laurie | f4d3623 | 2012-06-23 16:37:45 -0700 | [diff] [blame] | 810 | #if CONFIG_ELOG_BOOT_COUNT && !defined(__SMM__) |
| 811 | /* Log boot count event except in S3 resume */ |
| 812 | if (acpi_slp_type != 3) |
| 813 | elog_add_event_dword(ELOG_TYPE_BOOT, boot_count_read()); |
| 814 | #endif |
| 815 | |
Duncan Laurie | 7d2b81c | 2012-06-23 16:08:47 -0700 | [diff] [blame] | 816 | return 0; |
| 817 | } |
| 818 | |
| 819 | /* |
| 820 | * Populate timestamp in event header with current time |
| 821 | */ |
| 822 | static void elog_fill_timestamp(struct event_header *event) |
| 823 | { |
| 824 | event->second = cmos_read(RTC_CLK_SECOND); |
| 825 | event->minute = cmos_read(RTC_CLK_MINUTE); |
| 826 | event->hour = cmos_read(RTC_CLK_HOUR); |
| 827 | event->day = cmos_read(RTC_CLK_DAYOFMONTH); |
| 828 | event->month = cmos_read(RTC_CLK_MONTH); |
| 829 | event->year = cmos_read(RTC_CLK_YEAR); |
| 830 | |
| 831 | /* Basic sanity check of expected ranges */ |
| 832 | if (event->month > 0x12 || event->day > 0x31 || event->hour > 0x23 || |
| 833 | event->minute > 0x59 || event->second > 0x59) { |
| 834 | event->year = 0; |
| 835 | event->month = 0; |
| 836 | event->day = 0; |
| 837 | event->hour = 0; |
| 838 | event->minute = 0; |
| 839 | event->second = 0; |
| 840 | } |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * Add an event to the memory area |
| 845 | */ |
| 846 | static int elog_add_event_mem(u8 event_type, void *data, u8 data_size) |
| 847 | { |
| 848 | struct event_header *event; |
| 849 | struct elog_descriptor *mem = elog_get_mem(); |
| 850 | u8 event_size; |
| 851 | |
| 852 | elog_debug("elog_add_event_mem(type=%X)\n", event_type); |
| 853 | |
| 854 | /* Make sure ELOG structures are initialized */ |
| 855 | if (elog_init() < 0) |
| 856 | return -1; |
| 857 | |
| 858 | /* Header + Data + Checksum */ |
| 859 | event_size = sizeof(*event) + data_size + 1; |
| 860 | if (event_size > MAX_EVENT_SIZE) { |
| 861 | printk(BIOS_ERR, "ELOG: Event(%X) data size too " |
| 862 | "big (%d)\n", event_type, event_size); |
| 863 | return -1; |
| 864 | } |
| 865 | |
| 866 | /* Make sure event data can fit */ |
| 867 | if ((mem->next_event_offset + event_size) >= mem->data_size) { |
| 868 | printk(BIOS_ERR, "ELOG: Event(%X) does not fit\n", |
| 869 | event_type); |
| 870 | return -1; |
| 871 | } |
| 872 | |
| 873 | /* Fill out event data */ |
| 874 | event = elog_get_next_event_base(mem); |
| 875 | event->type = event_type; |
| 876 | event->length = event_size; |
| 877 | elog_fill_timestamp(event); |
| 878 | |
| 879 | if (data_size) |
| 880 | memcpy(&event[1], data, data_size); |
| 881 | |
| 882 | /* Zero the checksum byte and then compute checksum */ |
| 883 | elog_update_checksum(event, 0); |
| 884 | elog_update_checksum(event, -(elog_checksum_event(event))); |
| 885 | |
| 886 | /* Update memory descriptor parameters */ |
| 887 | mem->event_count++; |
| 888 | mem->last_event_offset = mem->next_event_offset; |
| 889 | mem->last_event_size = event_size; |
| 890 | mem->next_event_offset += event_size; |
| 891 | |
| 892 | printk(BIOS_INFO, "ELOG: Event(%X) added with size %d\n", |
| 893 | event_type, event_size); |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | void elog_add_event_raw(u8 event_type, void *data, u8 data_size) |
| 898 | { |
| 899 | elog_debug("elog_add_event_raw(type=%X)\n", event_type); |
| 900 | |
| 901 | /* Add event to the memory area */ |
| 902 | if (elog_add_event_mem(event_type, data, data_size) < 0) { |
| 903 | printk(BIOS_ERR, "Unable to add event to memory area\n"); |
| 904 | return; |
| 905 | } |
| 906 | |
| 907 | /* Sync the memory buffer to flash */ |
| 908 | elog_sync_mem_to_flash(); |
| 909 | |
| 910 | /* Shrink the log if we are getting too full */ |
| 911 | if (elog_get_mem()->next_event_offset >= CONFIG_ELOG_FULL_THRESHOLD) |
| 912 | elog_shrink(); |
| 913 | } |
| 914 | |
| 915 | void elog_add_event(u8 event_type) |
| 916 | { |
| 917 | elog_add_event_raw(event_type, NULL, 0); |
| 918 | } |
| 919 | |
| 920 | void elog_add_event_byte(u8 event_type, u8 data) |
| 921 | { |
| 922 | elog_add_event_raw(event_type, &data, sizeof(data)); |
| 923 | } |
| 924 | |
| 925 | void elog_add_event_word(u8 event_type, u16 data) |
| 926 | { |
| 927 | elog_add_event_raw(event_type, &data, sizeof(data)); |
| 928 | } |
| 929 | |
| 930 | void elog_add_event_dword(u8 event_type, u32 data) |
| 931 | { |
| 932 | elog_add_event_raw(event_type, &data, sizeof(data)); |
| 933 | } |
| 934 | |
| 935 | void elog_add_event_wake(u8 source, u32 instance) |
| 936 | { |
| 937 | struct elog_event_data_wake wake = { |
| 938 | .source = source, |
| 939 | .instance = instance |
| 940 | }; |
| 941 | elog_add_event_raw(ELOG_TYPE_WAKE_SOURCE, &wake, sizeof(wake)); |
| 942 | } |