Huang Ying | a08f82d | 2010-05-18 14:35:21 +0800 | [diff] [blame] | 1 | /* |
| 2 | * APEI Error Record Serialization Table support |
| 3 | * |
| 4 | * ERST is a way provided by APEI to save and retrieve hardware error |
| 5 | * infomation to and from a persistent store. |
| 6 | * |
| 7 | * For more information about ERST, please refer to ACPI Specification |
| 8 | * version 4.0, section 17.4. |
| 9 | * |
| 10 | * Copyright 2010 Intel Corp. |
| 11 | * Author: Huang Ying <ying.huang@intel.com> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU General Public License version |
| 15 | * 2 as published by the Free Software Foundation. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/io.h> |
| 32 | #include <linux/acpi.h> |
| 33 | #include <linux/uaccess.h> |
| 34 | #include <linux/cper.h> |
| 35 | #include <linux/nmi.h> |
Thomas Gleixner | 0a7992c | 2010-08-11 14:17:29 -0700 | [diff] [blame] | 36 | #include <linux/hardirq.h> |
Huang Ying | a08f82d | 2010-05-18 14:35:21 +0800 | [diff] [blame] | 37 | #include <acpi/apei.h> |
| 38 | |
| 39 | #include "apei-internal.h" |
| 40 | |
| 41 | #define ERST_PFX "ERST: " |
| 42 | |
| 43 | /* ERST command status */ |
| 44 | #define ERST_STATUS_SUCCESS 0x0 |
| 45 | #define ERST_STATUS_NOT_ENOUGH_SPACE 0x1 |
| 46 | #define ERST_STATUS_HARDWARE_NOT_AVAILABLE 0x2 |
| 47 | #define ERST_STATUS_FAILED 0x3 |
| 48 | #define ERST_STATUS_RECORD_STORE_EMPTY 0x4 |
| 49 | #define ERST_STATUS_RECORD_NOT_FOUND 0x5 |
| 50 | |
| 51 | #define ERST_TAB_ENTRY(tab) \ |
| 52 | ((struct acpi_whea_header *)((char *)(tab) + \ |
| 53 | sizeof(struct acpi_table_erst))) |
| 54 | |
| 55 | #define SPIN_UNIT 100 /* 100ns */ |
| 56 | /* Firmware should respond within 1 miliseconds */ |
| 57 | #define FIRMWARE_TIMEOUT (1 * NSEC_PER_MSEC) |
| 58 | #define FIRMWARE_MAX_STALL 50 /* 50us */ |
| 59 | |
| 60 | int erst_disable; |
| 61 | EXPORT_SYMBOL_GPL(erst_disable); |
| 62 | |
| 63 | static struct acpi_table_erst *erst_tab; |
| 64 | |
| 65 | /* ERST Error Log Address Range atrributes */ |
| 66 | #define ERST_RANGE_RESERVED 0x0001 |
| 67 | #define ERST_RANGE_NVRAM 0x0002 |
| 68 | #define ERST_RANGE_SLOW 0x0004 |
| 69 | |
| 70 | /* |
| 71 | * ERST Error Log Address Range, used as buffer for reading/writing |
| 72 | * error records. |
| 73 | */ |
| 74 | static struct erst_erange { |
| 75 | u64 base; |
| 76 | u64 size; |
| 77 | void __iomem *vaddr; |
| 78 | u32 attr; |
| 79 | } erst_erange; |
| 80 | |
| 81 | /* |
| 82 | * Prevent ERST interpreter to run simultaneously, because the |
| 83 | * corresponding firmware implementation may not work properly when |
| 84 | * invoked simultaneously. |
| 85 | * |
| 86 | * It is used to provide exclusive accessing for ERST Error Log |
| 87 | * Address Range too. |
| 88 | */ |
| 89 | static DEFINE_SPINLOCK(erst_lock); |
| 90 | |
| 91 | static inline int erst_errno(int command_status) |
| 92 | { |
| 93 | switch (command_status) { |
| 94 | case ERST_STATUS_SUCCESS: |
| 95 | return 0; |
| 96 | case ERST_STATUS_HARDWARE_NOT_AVAILABLE: |
| 97 | return -ENODEV; |
| 98 | case ERST_STATUS_NOT_ENOUGH_SPACE: |
| 99 | return -ENOSPC; |
| 100 | case ERST_STATUS_RECORD_STORE_EMPTY: |
| 101 | case ERST_STATUS_RECORD_NOT_FOUND: |
| 102 | return -ENOENT; |
| 103 | default: |
| 104 | return -EINVAL; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | static int erst_timedout(u64 *t, u64 spin_unit) |
| 109 | { |
| 110 | if ((s64)*t < spin_unit) { |
| 111 | pr_warning(FW_WARN ERST_PFX |
| 112 | "Firmware does not respond in time\n"); |
| 113 | return 1; |
| 114 | } |
| 115 | *t -= spin_unit; |
| 116 | ndelay(spin_unit); |
| 117 | touch_nmi_watchdog(); |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static int erst_exec_load_var1(struct apei_exec_context *ctx, |
| 122 | struct acpi_whea_header *entry) |
| 123 | { |
| 124 | return __apei_exec_read_register(entry, &ctx->var1); |
| 125 | } |
| 126 | |
| 127 | static int erst_exec_load_var2(struct apei_exec_context *ctx, |
| 128 | struct acpi_whea_header *entry) |
| 129 | { |
| 130 | return __apei_exec_read_register(entry, &ctx->var2); |
| 131 | } |
| 132 | |
| 133 | static int erst_exec_store_var1(struct apei_exec_context *ctx, |
| 134 | struct acpi_whea_header *entry) |
| 135 | { |
| 136 | return __apei_exec_write_register(entry, ctx->var1); |
| 137 | } |
| 138 | |
| 139 | static int erst_exec_add(struct apei_exec_context *ctx, |
| 140 | struct acpi_whea_header *entry) |
| 141 | { |
| 142 | ctx->var1 += ctx->var2; |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static int erst_exec_subtract(struct apei_exec_context *ctx, |
| 147 | struct acpi_whea_header *entry) |
| 148 | { |
| 149 | ctx->var1 -= ctx->var2; |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int erst_exec_add_value(struct apei_exec_context *ctx, |
| 154 | struct acpi_whea_header *entry) |
| 155 | { |
| 156 | int rc; |
| 157 | u64 val; |
| 158 | |
| 159 | rc = __apei_exec_read_register(entry, &val); |
| 160 | if (rc) |
| 161 | return rc; |
| 162 | val += ctx->value; |
| 163 | rc = __apei_exec_write_register(entry, val); |
| 164 | return rc; |
| 165 | } |
| 166 | |
| 167 | static int erst_exec_subtract_value(struct apei_exec_context *ctx, |
| 168 | struct acpi_whea_header *entry) |
| 169 | { |
| 170 | int rc; |
| 171 | u64 val; |
| 172 | |
| 173 | rc = __apei_exec_read_register(entry, &val); |
| 174 | if (rc) |
| 175 | return rc; |
| 176 | val -= ctx->value; |
| 177 | rc = __apei_exec_write_register(entry, val); |
| 178 | return rc; |
| 179 | } |
| 180 | |
| 181 | static int erst_exec_stall(struct apei_exec_context *ctx, |
| 182 | struct acpi_whea_header *entry) |
| 183 | { |
| 184 | u64 stall_time; |
| 185 | |
| 186 | if (ctx->value > FIRMWARE_MAX_STALL) { |
| 187 | if (!in_nmi()) |
| 188 | pr_warning(FW_WARN ERST_PFX |
| 189 | "Too long stall time for stall instruction: %llx.\n", |
| 190 | ctx->value); |
| 191 | stall_time = FIRMWARE_MAX_STALL; |
| 192 | } else |
| 193 | stall_time = ctx->value; |
| 194 | udelay(stall_time); |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | static int erst_exec_stall_while_true(struct apei_exec_context *ctx, |
| 199 | struct acpi_whea_header *entry) |
| 200 | { |
| 201 | int rc; |
| 202 | u64 val; |
| 203 | u64 timeout = FIRMWARE_TIMEOUT; |
| 204 | u64 stall_time; |
| 205 | |
| 206 | if (ctx->var1 > FIRMWARE_MAX_STALL) { |
| 207 | if (!in_nmi()) |
| 208 | pr_warning(FW_WARN ERST_PFX |
| 209 | "Too long stall time for stall while true instruction: %llx.\n", |
| 210 | ctx->var1); |
| 211 | stall_time = FIRMWARE_MAX_STALL; |
| 212 | } else |
| 213 | stall_time = ctx->var1; |
| 214 | |
| 215 | for (;;) { |
| 216 | rc = __apei_exec_read_register(entry, &val); |
| 217 | if (rc) |
| 218 | return rc; |
| 219 | if (val != ctx->value) |
| 220 | break; |
| 221 | if (erst_timedout(&timeout, stall_time * NSEC_PER_USEC)) |
| 222 | return -EIO; |
| 223 | } |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static int erst_exec_skip_next_instruction_if_true( |
| 228 | struct apei_exec_context *ctx, |
| 229 | struct acpi_whea_header *entry) |
| 230 | { |
| 231 | int rc; |
| 232 | u64 val; |
| 233 | |
| 234 | rc = __apei_exec_read_register(entry, &val); |
| 235 | if (rc) |
| 236 | return rc; |
| 237 | if (val == ctx->value) { |
| 238 | ctx->ip += 2; |
| 239 | return APEI_EXEC_SET_IP; |
| 240 | } |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static int erst_exec_goto(struct apei_exec_context *ctx, |
| 246 | struct acpi_whea_header *entry) |
| 247 | { |
| 248 | ctx->ip = ctx->value; |
| 249 | return APEI_EXEC_SET_IP; |
| 250 | } |
| 251 | |
| 252 | static int erst_exec_set_src_address_base(struct apei_exec_context *ctx, |
| 253 | struct acpi_whea_header *entry) |
| 254 | { |
| 255 | return __apei_exec_read_register(entry, &ctx->src_base); |
| 256 | } |
| 257 | |
| 258 | static int erst_exec_set_dst_address_base(struct apei_exec_context *ctx, |
| 259 | struct acpi_whea_header *entry) |
| 260 | { |
| 261 | return __apei_exec_read_register(entry, &ctx->dst_base); |
| 262 | } |
| 263 | |
| 264 | static int erst_exec_move_data(struct apei_exec_context *ctx, |
| 265 | struct acpi_whea_header *entry) |
| 266 | { |
| 267 | int rc; |
| 268 | u64 offset; |
| 269 | |
| 270 | rc = __apei_exec_read_register(entry, &offset); |
| 271 | if (rc) |
| 272 | return rc; |
| 273 | memmove((void *)ctx->dst_base + offset, |
| 274 | (void *)ctx->src_base + offset, |
| 275 | ctx->var2); |
| 276 | |
| 277 | return 0; |
| 278 | } |
| 279 | |
| 280 | static struct apei_exec_ins_type erst_ins_type[] = { |
| 281 | [ACPI_ERST_READ_REGISTER] = { |
| 282 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 283 | .run = apei_exec_read_register, |
| 284 | }, |
| 285 | [ACPI_ERST_READ_REGISTER_VALUE] = { |
| 286 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 287 | .run = apei_exec_read_register_value, |
| 288 | }, |
| 289 | [ACPI_ERST_WRITE_REGISTER] = { |
| 290 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 291 | .run = apei_exec_write_register, |
| 292 | }, |
| 293 | [ACPI_ERST_WRITE_REGISTER_VALUE] = { |
| 294 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 295 | .run = apei_exec_write_register_value, |
| 296 | }, |
| 297 | [ACPI_ERST_NOOP] = { |
| 298 | .flags = 0, |
| 299 | .run = apei_exec_noop, |
| 300 | }, |
| 301 | [ACPI_ERST_LOAD_VAR1] = { |
| 302 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 303 | .run = erst_exec_load_var1, |
| 304 | }, |
| 305 | [ACPI_ERST_LOAD_VAR2] = { |
| 306 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 307 | .run = erst_exec_load_var2, |
| 308 | }, |
| 309 | [ACPI_ERST_STORE_VAR1] = { |
| 310 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 311 | .run = erst_exec_store_var1, |
| 312 | }, |
| 313 | [ACPI_ERST_ADD] = { |
| 314 | .flags = 0, |
| 315 | .run = erst_exec_add, |
| 316 | }, |
| 317 | [ACPI_ERST_SUBTRACT] = { |
| 318 | .flags = 0, |
| 319 | .run = erst_exec_subtract, |
| 320 | }, |
| 321 | [ACPI_ERST_ADD_VALUE] = { |
| 322 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 323 | .run = erst_exec_add_value, |
| 324 | }, |
| 325 | [ACPI_ERST_SUBTRACT_VALUE] = { |
| 326 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 327 | .run = erst_exec_subtract_value, |
| 328 | }, |
| 329 | [ACPI_ERST_STALL] = { |
| 330 | .flags = 0, |
| 331 | .run = erst_exec_stall, |
| 332 | }, |
| 333 | [ACPI_ERST_STALL_WHILE_TRUE] = { |
| 334 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 335 | .run = erst_exec_stall_while_true, |
| 336 | }, |
| 337 | [ACPI_ERST_SKIP_NEXT_IF_TRUE] = { |
| 338 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 339 | .run = erst_exec_skip_next_instruction_if_true, |
| 340 | }, |
| 341 | [ACPI_ERST_GOTO] = { |
| 342 | .flags = 0, |
| 343 | .run = erst_exec_goto, |
| 344 | }, |
| 345 | [ACPI_ERST_SET_SRC_ADDRESS_BASE] = { |
| 346 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 347 | .run = erst_exec_set_src_address_base, |
| 348 | }, |
| 349 | [ACPI_ERST_SET_DST_ADDRESS_BASE] = { |
| 350 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 351 | .run = erst_exec_set_dst_address_base, |
| 352 | }, |
| 353 | [ACPI_ERST_MOVE_DATA] = { |
| 354 | .flags = APEI_EXEC_INS_ACCESS_REGISTER, |
| 355 | .run = erst_exec_move_data, |
| 356 | }, |
| 357 | }; |
| 358 | |
| 359 | static inline void erst_exec_ctx_init(struct apei_exec_context *ctx) |
| 360 | { |
| 361 | apei_exec_ctx_init(ctx, erst_ins_type, ARRAY_SIZE(erst_ins_type), |
| 362 | ERST_TAB_ENTRY(erst_tab), erst_tab->entries); |
| 363 | } |
| 364 | |
| 365 | static int erst_get_erange(struct erst_erange *range) |
| 366 | { |
| 367 | struct apei_exec_context ctx; |
| 368 | int rc; |
| 369 | |
| 370 | erst_exec_ctx_init(&ctx); |
| 371 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_RANGE); |
| 372 | if (rc) |
| 373 | return rc; |
| 374 | range->base = apei_exec_ctx_get_output(&ctx); |
| 375 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_LENGTH); |
| 376 | if (rc) |
| 377 | return rc; |
| 378 | range->size = apei_exec_ctx_get_output(&ctx); |
| 379 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_ERROR_ATTRIBUTES); |
| 380 | if (rc) |
| 381 | return rc; |
| 382 | range->attr = apei_exec_ctx_get_output(&ctx); |
| 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | static ssize_t __erst_get_record_count(void) |
| 388 | { |
| 389 | struct apei_exec_context ctx; |
| 390 | int rc; |
| 391 | |
| 392 | erst_exec_ctx_init(&ctx); |
| 393 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_COUNT); |
| 394 | if (rc) |
| 395 | return rc; |
| 396 | return apei_exec_ctx_get_output(&ctx); |
| 397 | } |
| 398 | |
| 399 | ssize_t erst_get_record_count(void) |
| 400 | { |
| 401 | ssize_t count; |
| 402 | unsigned long flags; |
| 403 | |
| 404 | if (erst_disable) |
| 405 | return -ENODEV; |
| 406 | |
| 407 | spin_lock_irqsave(&erst_lock, flags); |
| 408 | count = __erst_get_record_count(); |
| 409 | spin_unlock_irqrestore(&erst_lock, flags); |
| 410 | |
| 411 | return count; |
| 412 | } |
| 413 | EXPORT_SYMBOL_GPL(erst_get_record_count); |
| 414 | |
| 415 | static int __erst_get_next_record_id(u64 *record_id) |
| 416 | { |
| 417 | struct apei_exec_context ctx; |
| 418 | int rc; |
| 419 | |
| 420 | erst_exec_ctx_init(&ctx); |
| 421 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_RECORD_ID); |
| 422 | if (rc) |
| 423 | return rc; |
| 424 | *record_id = apei_exec_ctx_get_output(&ctx); |
| 425 | |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Get the record ID of an existing error record on the persistent |
| 431 | * storage. If there is no error record on the persistent storage, the |
| 432 | * returned record_id is APEI_ERST_INVALID_RECORD_ID. |
| 433 | */ |
| 434 | int erst_get_next_record_id(u64 *record_id) |
| 435 | { |
| 436 | int rc; |
| 437 | unsigned long flags; |
| 438 | |
| 439 | if (erst_disable) |
| 440 | return -ENODEV; |
| 441 | |
| 442 | spin_lock_irqsave(&erst_lock, flags); |
| 443 | rc = __erst_get_next_record_id(record_id); |
| 444 | spin_unlock_irqrestore(&erst_lock, flags); |
| 445 | |
| 446 | return rc; |
| 447 | } |
| 448 | EXPORT_SYMBOL_GPL(erst_get_next_record_id); |
| 449 | |
| 450 | static int __erst_write_to_storage(u64 offset) |
| 451 | { |
| 452 | struct apei_exec_context ctx; |
| 453 | u64 timeout = FIRMWARE_TIMEOUT; |
| 454 | u64 val; |
| 455 | int rc; |
| 456 | |
| 457 | erst_exec_ctx_init(&ctx); |
| 458 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_WRITE); |
| 459 | if (rc) |
| 460 | return rc; |
| 461 | apei_exec_ctx_set_input(&ctx, offset); |
| 462 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); |
| 463 | if (rc) |
| 464 | return rc; |
| 465 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); |
| 466 | if (rc) |
| 467 | return rc; |
| 468 | for (;;) { |
| 469 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); |
| 470 | if (rc) |
| 471 | return rc; |
| 472 | val = apei_exec_ctx_get_output(&ctx); |
| 473 | if (!val) |
| 474 | break; |
| 475 | if (erst_timedout(&timeout, SPIN_UNIT)) |
| 476 | return -EIO; |
| 477 | } |
| 478 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); |
| 479 | if (rc) |
| 480 | return rc; |
| 481 | val = apei_exec_ctx_get_output(&ctx); |
| 482 | rc = apei_exec_run(&ctx, ACPI_ERST_END); |
| 483 | if (rc) |
| 484 | return rc; |
| 485 | |
| 486 | return erst_errno(val); |
| 487 | } |
| 488 | |
| 489 | static int __erst_read_from_storage(u64 record_id, u64 offset) |
| 490 | { |
| 491 | struct apei_exec_context ctx; |
| 492 | u64 timeout = FIRMWARE_TIMEOUT; |
| 493 | u64 val; |
| 494 | int rc; |
| 495 | |
| 496 | erst_exec_ctx_init(&ctx); |
| 497 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_READ); |
| 498 | if (rc) |
| 499 | return rc; |
| 500 | apei_exec_ctx_set_input(&ctx, offset); |
| 501 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_OFFSET); |
| 502 | if (rc) |
| 503 | return rc; |
| 504 | apei_exec_ctx_set_input(&ctx, record_id); |
| 505 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); |
| 506 | if (rc) |
| 507 | return rc; |
| 508 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); |
| 509 | if (rc) |
| 510 | return rc; |
| 511 | for (;;) { |
| 512 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); |
| 513 | if (rc) |
| 514 | return rc; |
| 515 | val = apei_exec_ctx_get_output(&ctx); |
| 516 | if (!val) |
| 517 | break; |
| 518 | if (erst_timedout(&timeout, SPIN_UNIT)) |
| 519 | return -EIO; |
| 520 | }; |
| 521 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); |
| 522 | if (rc) |
| 523 | return rc; |
| 524 | val = apei_exec_ctx_get_output(&ctx); |
| 525 | rc = apei_exec_run(&ctx, ACPI_ERST_END); |
| 526 | if (rc) |
| 527 | return rc; |
| 528 | |
| 529 | return erst_errno(val); |
| 530 | } |
| 531 | |
| 532 | static int __erst_clear_from_storage(u64 record_id) |
| 533 | { |
| 534 | struct apei_exec_context ctx; |
| 535 | u64 timeout = FIRMWARE_TIMEOUT; |
| 536 | u64 val; |
| 537 | int rc; |
| 538 | |
| 539 | erst_exec_ctx_init(&ctx); |
| 540 | rc = apei_exec_run(&ctx, ACPI_ERST_BEGIN_CLEAR); |
| 541 | if (rc) |
| 542 | return rc; |
| 543 | apei_exec_ctx_set_input(&ctx, record_id); |
| 544 | rc = apei_exec_run(&ctx, ACPI_ERST_SET_RECORD_ID); |
| 545 | if (rc) |
| 546 | return rc; |
| 547 | rc = apei_exec_run(&ctx, ACPI_ERST_EXECUTE_OPERATION); |
| 548 | if (rc) |
| 549 | return rc; |
| 550 | for (;;) { |
| 551 | rc = apei_exec_run(&ctx, ACPI_ERST_CHECK_BUSY_STATUS); |
| 552 | if (rc) |
| 553 | return rc; |
| 554 | val = apei_exec_ctx_get_output(&ctx); |
| 555 | if (!val) |
| 556 | break; |
| 557 | if (erst_timedout(&timeout, SPIN_UNIT)) |
| 558 | return -EIO; |
| 559 | } |
| 560 | rc = apei_exec_run(&ctx, ACPI_ERST_GET_COMMAND_STATUS); |
| 561 | if (rc) |
| 562 | return rc; |
| 563 | val = apei_exec_ctx_get_output(&ctx); |
| 564 | rc = apei_exec_run(&ctx, ACPI_ERST_END); |
| 565 | if (rc) |
| 566 | return rc; |
| 567 | |
| 568 | return erst_errno(val); |
| 569 | } |
| 570 | |
| 571 | /* NVRAM ERST Error Log Address Range is not supported yet */ |
| 572 | static void pr_unimpl_nvram(void) |
| 573 | { |
| 574 | if (printk_ratelimit()) |
| 575 | pr_warning(ERST_PFX |
| 576 | "NVRAM ERST Log Address Range is not implemented yet\n"); |
| 577 | } |
| 578 | |
| 579 | static int __erst_write_to_nvram(const struct cper_record_header *record) |
| 580 | { |
| 581 | /* do not print message, because printk is not safe for NMI */ |
| 582 | return -ENOSYS; |
| 583 | } |
| 584 | |
| 585 | static int __erst_read_to_erange_from_nvram(u64 record_id, u64 *offset) |
| 586 | { |
| 587 | pr_unimpl_nvram(); |
| 588 | return -ENOSYS; |
| 589 | } |
| 590 | |
| 591 | static int __erst_clear_from_nvram(u64 record_id) |
| 592 | { |
| 593 | pr_unimpl_nvram(); |
| 594 | return -ENOSYS; |
| 595 | } |
| 596 | |
| 597 | int erst_write(const struct cper_record_header *record) |
| 598 | { |
| 599 | int rc; |
| 600 | unsigned long flags; |
| 601 | struct cper_record_header *rcd_erange; |
| 602 | |
| 603 | if (erst_disable) |
| 604 | return -ENODEV; |
| 605 | |
| 606 | if (memcmp(record->signature, CPER_SIG_RECORD, CPER_SIG_SIZE)) |
| 607 | return -EINVAL; |
| 608 | |
| 609 | if (erst_erange.attr & ERST_RANGE_NVRAM) { |
| 610 | if (!spin_trylock_irqsave(&erst_lock, flags)) |
| 611 | return -EBUSY; |
| 612 | rc = __erst_write_to_nvram(record); |
| 613 | spin_unlock_irqrestore(&erst_lock, flags); |
| 614 | return rc; |
| 615 | } |
| 616 | |
| 617 | if (record->record_length > erst_erange.size) |
| 618 | return -EINVAL; |
| 619 | |
| 620 | if (!spin_trylock_irqsave(&erst_lock, flags)) |
| 621 | return -EBUSY; |
| 622 | memcpy(erst_erange.vaddr, record, record->record_length); |
| 623 | rcd_erange = erst_erange.vaddr; |
| 624 | /* signature for serialization system */ |
| 625 | memcpy(&rcd_erange->persistence_information, "ER", 2); |
| 626 | |
| 627 | rc = __erst_write_to_storage(0); |
| 628 | spin_unlock_irqrestore(&erst_lock, flags); |
| 629 | |
| 630 | return rc; |
| 631 | } |
| 632 | EXPORT_SYMBOL_GPL(erst_write); |
| 633 | |
| 634 | static int __erst_read_to_erange(u64 record_id, u64 *offset) |
| 635 | { |
| 636 | int rc; |
| 637 | |
| 638 | if (erst_erange.attr & ERST_RANGE_NVRAM) |
| 639 | return __erst_read_to_erange_from_nvram( |
| 640 | record_id, offset); |
| 641 | |
| 642 | rc = __erst_read_from_storage(record_id, 0); |
| 643 | if (rc) |
| 644 | return rc; |
| 645 | *offset = 0; |
| 646 | |
| 647 | return 0; |
| 648 | } |
| 649 | |
| 650 | static ssize_t __erst_read(u64 record_id, struct cper_record_header *record, |
| 651 | size_t buflen) |
| 652 | { |
| 653 | int rc; |
| 654 | u64 offset, len = 0; |
| 655 | struct cper_record_header *rcd_tmp; |
| 656 | |
| 657 | rc = __erst_read_to_erange(record_id, &offset); |
| 658 | if (rc) |
| 659 | return rc; |
| 660 | rcd_tmp = erst_erange.vaddr + offset; |
| 661 | len = rcd_tmp->record_length; |
| 662 | if (len <= buflen) |
| 663 | memcpy(record, rcd_tmp, len); |
| 664 | |
| 665 | return len; |
| 666 | } |
| 667 | |
| 668 | /* |
| 669 | * If return value > buflen, the buffer size is not big enough, |
| 670 | * else if return value < 0, something goes wrong, |
| 671 | * else everything is OK, and return value is record length |
| 672 | */ |
| 673 | ssize_t erst_read(u64 record_id, struct cper_record_header *record, |
| 674 | size_t buflen) |
| 675 | { |
| 676 | ssize_t len; |
| 677 | unsigned long flags; |
| 678 | |
| 679 | if (erst_disable) |
| 680 | return -ENODEV; |
| 681 | |
| 682 | spin_lock_irqsave(&erst_lock, flags); |
| 683 | len = __erst_read(record_id, record, buflen); |
| 684 | spin_unlock_irqrestore(&erst_lock, flags); |
| 685 | return len; |
| 686 | } |
| 687 | EXPORT_SYMBOL_GPL(erst_read); |
| 688 | |
| 689 | /* |
| 690 | * If return value > buflen, the buffer size is not big enough, |
| 691 | * else if return value = 0, there is no more record to read, |
| 692 | * else if return value < 0, something goes wrong, |
| 693 | * else everything is OK, and return value is record length |
| 694 | */ |
| 695 | ssize_t erst_read_next(struct cper_record_header *record, size_t buflen) |
| 696 | { |
| 697 | int rc; |
| 698 | ssize_t len; |
| 699 | unsigned long flags; |
| 700 | u64 record_id; |
| 701 | |
| 702 | if (erst_disable) |
| 703 | return -ENODEV; |
| 704 | |
| 705 | spin_lock_irqsave(&erst_lock, flags); |
| 706 | rc = __erst_get_next_record_id(&record_id); |
| 707 | if (rc) { |
| 708 | spin_unlock_irqrestore(&erst_lock, flags); |
| 709 | return rc; |
| 710 | } |
| 711 | /* no more record */ |
| 712 | if (record_id == APEI_ERST_INVALID_RECORD_ID) { |
| 713 | spin_unlock_irqrestore(&erst_lock, flags); |
| 714 | return 0; |
| 715 | } |
| 716 | |
| 717 | len = __erst_read(record_id, record, buflen); |
| 718 | spin_unlock_irqrestore(&erst_lock, flags); |
| 719 | |
| 720 | return len; |
| 721 | } |
| 722 | EXPORT_SYMBOL_GPL(erst_read_next); |
| 723 | |
| 724 | int erst_clear(u64 record_id) |
| 725 | { |
| 726 | int rc; |
| 727 | unsigned long flags; |
| 728 | |
| 729 | if (erst_disable) |
| 730 | return -ENODEV; |
| 731 | |
| 732 | spin_lock_irqsave(&erst_lock, flags); |
| 733 | if (erst_erange.attr & ERST_RANGE_NVRAM) |
| 734 | rc = __erst_clear_from_nvram(record_id); |
| 735 | else |
| 736 | rc = __erst_clear_from_storage(record_id); |
| 737 | spin_unlock_irqrestore(&erst_lock, flags); |
| 738 | |
| 739 | return rc; |
| 740 | } |
| 741 | EXPORT_SYMBOL_GPL(erst_clear); |
| 742 | |
| 743 | static int __init setup_erst_disable(char *str) |
| 744 | { |
| 745 | erst_disable = 1; |
| 746 | return 0; |
| 747 | } |
| 748 | |
| 749 | __setup("erst_disable", setup_erst_disable); |
| 750 | |
| 751 | static int erst_check_table(struct acpi_table_erst *erst_tab) |
| 752 | { |
Huang Ying | 3a78f96 | 2010-09-29 19:53:51 +0800 | [diff] [blame^] | 753 | if ((erst_tab->header_length != |
| 754 | (sizeof(struct acpi_table_erst) - sizeof(erst_tab->header))) |
| 755 | && (erst_tab->header_length != sizeof(struct acpi_table_einj))) |
Huang Ying | a08f82d | 2010-05-18 14:35:21 +0800 | [diff] [blame] | 756 | return -EINVAL; |
| 757 | if (erst_tab->header.length < sizeof(struct acpi_table_erst)) |
| 758 | return -EINVAL; |
| 759 | if (erst_tab->entries != |
| 760 | (erst_tab->header.length - sizeof(struct acpi_table_erst)) / |
| 761 | sizeof(struct acpi_erst_entry)) |
| 762 | return -EINVAL; |
| 763 | |
| 764 | return 0; |
| 765 | } |
| 766 | |
| 767 | static int __init erst_init(void) |
| 768 | { |
| 769 | int rc = 0; |
| 770 | acpi_status status; |
| 771 | struct apei_exec_context ctx; |
| 772 | struct apei_resources erst_resources; |
| 773 | struct resource *r; |
| 774 | |
| 775 | if (acpi_disabled) |
| 776 | goto err; |
| 777 | |
| 778 | if (erst_disable) { |
| 779 | pr_info(ERST_PFX |
| 780 | "Error Record Serialization Table (ERST) support is disabled.\n"); |
| 781 | goto err; |
| 782 | } |
| 783 | |
| 784 | status = acpi_get_table(ACPI_SIG_ERST, 0, |
| 785 | (struct acpi_table_header **)&erst_tab); |
| 786 | if (status == AE_NOT_FOUND) { |
Daniel J Blueman | 980533b | 2010-07-01 23:27:11 +0100 | [diff] [blame] | 787 | pr_info(ERST_PFX "Table is not found!\n"); |
Huang Ying | a08f82d | 2010-05-18 14:35:21 +0800 | [diff] [blame] | 788 | goto err; |
| 789 | } else if (ACPI_FAILURE(status)) { |
| 790 | const char *msg = acpi_format_exception(status); |
| 791 | pr_err(ERST_PFX "Failed to get table, %s\n", msg); |
| 792 | rc = -EINVAL; |
| 793 | goto err; |
| 794 | } |
| 795 | |
| 796 | rc = erst_check_table(erst_tab); |
| 797 | if (rc) { |
| 798 | pr_err(FW_BUG ERST_PFX "ERST table is invalid\n"); |
| 799 | goto err; |
| 800 | } |
| 801 | |
| 802 | apei_resources_init(&erst_resources); |
| 803 | erst_exec_ctx_init(&ctx); |
| 804 | rc = apei_exec_collect_resources(&ctx, &erst_resources); |
| 805 | if (rc) |
| 806 | goto err_fini; |
| 807 | rc = apei_resources_request(&erst_resources, "APEI ERST"); |
| 808 | if (rc) |
| 809 | goto err_fini; |
| 810 | rc = apei_exec_pre_map_gars(&ctx); |
| 811 | if (rc) |
| 812 | goto err_release; |
| 813 | rc = erst_get_erange(&erst_erange); |
| 814 | if (rc) { |
| 815 | if (rc == -ENODEV) |
| 816 | pr_info(ERST_PFX |
| 817 | "The corresponding hardware device or firmware implementation " |
| 818 | "is not available.\n"); |
| 819 | else |
| 820 | pr_err(ERST_PFX |
| 821 | "Failed to get Error Log Address Range.\n"); |
| 822 | goto err_unmap_reg; |
| 823 | } |
| 824 | |
| 825 | r = request_mem_region(erst_erange.base, erst_erange.size, "APEI ERST"); |
| 826 | if (!r) { |
| 827 | pr_err(ERST_PFX |
| 828 | "Can not request iomem region <0x%16llx-0x%16llx> for ERST.\n", |
| 829 | (unsigned long long)erst_erange.base, |
| 830 | (unsigned long long)erst_erange.base + erst_erange.size); |
| 831 | rc = -EIO; |
| 832 | goto err_unmap_reg; |
| 833 | } |
| 834 | rc = -ENOMEM; |
| 835 | erst_erange.vaddr = ioremap_cache(erst_erange.base, |
| 836 | erst_erange.size); |
| 837 | if (!erst_erange.vaddr) |
| 838 | goto err_release_erange; |
| 839 | |
| 840 | pr_info(ERST_PFX |
| 841 | "Error Record Serialization Table (ERST) support is initialized.\n"); |
| 842 | |
| 843 | return 0; |
| 844 | |
| 845 | err_release_erange: |
| 846 | release_mem_region(erst_erange.base, erst_erange.size); |
| 847 | err_unmap_reg: |
| 848 | apei_exec_post_unmap_gars(&ctx); |
| 849 | err_release: |
| 850 | apei_resources_release(&erst_resources); |
| 851 | err_fini: |
| 852 | apei_resources_fini(&erst_resources); |
| 853 | err: |
| 854 | erst_disable = 1; |
| 855 | return rc; |
| 856 | } |
| 857 | |
| 858 | device_initcall(erst_init); |