1 /* 2 * Support for generating APEI tables and recording CPER for Guests 3 * 4 * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD. 5 * 6 * Author: Dongjiu Geng <gengdongjiu@huawei.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, see <http://www.gnu.org/licenses/>. 20 */ 21 22 #include "qemu/osdep.h" 23 #include "qemu/units.h" 24 #include "hw/acpi/ghes.h" 25 #include "hw/acpi/aml-build.h" 26 #include "qemu/error-report.h" 27 #include "hw/acpi/generic_event_device.h" 28 #include "hw/nvram/fw_cfg.h" 29 #include "qemu/uuid.h" 30 31 #define ACPI_GHES_ERRORS_FW_CFG_FILE "etc/hardware_errors" 32 #define ACPI_GHES_DATA_ADDR_FW_CFG_FILE "etc/hardware_errors_addr" 33 34 /* The max size in bytes for one error block */ 35 #define ACPI_GHES_MAX_RAW_DATA_LENGTH (1 * KiB) 36 37 /* Now only support ARMv8 SEA notification type error source */ 38 #define ACPI_GHES_ERROR_SOURCE_COUNT 1 39 40 /* Generic Hardware Error Source version 2 */ 41 #define ACPI_GHES_SOURCE_GENERIC_ERROR_V2 10 42 43 /* Address offset in Generic Address Structure(GAS) */ 44 #define GAS_ADDR_OFFSET 4 45 46 /* 47 * The total size of Generic Error Data Entry 48 * ACPI 6.1/6.2: 18.3.2.7.1 Generic Error Data, 49 * Table 18-343 Generic Error Data Entry 50 */ 51 #define ACPI_GHES_DATA_LENGTH 72 52 53 /* The memory section CPER size, UEFI 2.6: N.2.5 Memory Error Section */ 54 #define ACPI_GHES_MEM_CPER_LENGTH 80 55 56 /* Masks for block_status flags */ 57 #define ACPI_GEBS_UNCORRECTABLE 1 58 59 /* 60 * Total size for Generic Error Status Block except Generic Error Data Entries 61 * ACPI 6.2: 18.3.2.7.1 Generic Error Data, 62 * Table 18-380 Generic Error Status Block 63 */ 64 #define ACPI_GHES_GESB_SIZE 20 65 66 /* 67 * Values for error_severity field 68 */ 69 enum AcpiGenericErrorSeverity { 70 ACPI_CPER_SEV_RECOVERABLE = 0, 71 ACPI_CPER_SEV_FATAL = 1, 72 ACPI_CPER_SEV_CORRECTED = 2, 73 ACPI_CPER_SEV_NONE = 3, 74 }; 75 76 /* 77 * Hardware Error Notification 78 * ACPI 4.0: 17.3.2.7 Hardware Error Notification 79 * Composes dummy Hardware Error Notification descriptor of specified type 80 */ 81 static void build_ghes_hw_error_notification(GArray *table, const uint8_t type) 82 { 83 /* Type */ 84 build_append_int_noprefix(table, type, 1); 85 /* 86 * Length: 87 * Total length of the structure in bytes 88 */ 89 build_append_int_noprefix(table, 28, 1); 90 /* Configuration Write Enable */ 91 build_append_int_noprefix(table, 0, 2); 92 /* Poll Interval */ 93 build_append_int_noprefix(table, 0, 4); 94 /* Vector */ 95 build_append_int_noprefix(table, 0, 4); 96 /* Switch To Polling Threshold Value */ 97 build_append_int_noprefix(table, 0, 4); 98 /* Switch To Polling Threshold Window */ 99 build_append_int_noprefix(table, 0, 4); 100 /* Error Threshold Value */ 101 build_append_int_noprefix(table, 0, 4); 102 /* Error Threshold Window */ 103 build_append_int_noprefix(table, 0, 4); 104 } 105 106 /* 107 * Generic Error Data Entry 108 * ACPI 6.1: 18.3.2.7.1 Generic Error Data 109 */ 110 static void acpi_ghes_generic_error_data(GArray *table, 111 const uint8_t *section_type, uint32_t error_severity, 112 uint8_t validation_bits, uint8_t flags, 113 uint32_t error_data_length, QemuUUID fru_id, 114 uint64_t time_stamp) 115 { 116 const uint8_t fru_text[20] = {0}; 117 118 /* Section Type */ 119 g_array_append_vals(table, section_type, 16); 120 121 /* Error Severity */ 122 build_append_int_noprefix(table, error_severity, 4); 123 /* Revision */ 124 build_append_int_noprefix(table, 0x300, 2); 125 /* Validation Bits */ 126 build_append_int_noprefix(table, validation_bits, 1); 127 /* Flags */ 128 build_append_int_noprefix(table, flags, 1); 129 /* Error Data Length */ 130 build_append_int_noprefix(table, error_data_length, 4); 131 132 /* FRU Id */ 133 g_array_append_vals(table, fru_id.data, ARRAY_SIZE(fru_id.data)); 134 135 /* FRU Text */ 136 g_array_append_vals(table, fru_text, sizeof(fru_text)); 137 138 /* Timestamp */ 139 build_append_int_noprefix(table, time_stamp, 8); 140 } 141 142 /* 143 * Generic Error Status Block 144 * ACPI 6.1: 18.3.2.7.1 Generic Error Data 145 */ 146 static void acpi_ghes_generic_error_status(GArray *table, uint32_t block_status, 147 uint32_t raw_data_offset, uint32_t raw_data_length, 148 uint32_t data_length, uint32_t error_severity) 149 { 150 /* Block Status */ 151 build_append_int_noprefix(table, block_status, 4); 152 /* Raw Data Offset */ 153 build_append_int_noprefix(table, raw_data_offset, 4); 154 /* Raw Data Length */ 155 build_append_int_noprefix(table, raw_data_length, 4); 156 /* Data Length */ 157 build_append_int_noprefix(table, data_length, 4); 158 /* Error Severity */ 159 build_append_int_noprefix(table, error_severity, 4); 160 } 161 162 /* UEFI 2.6: N.2.5 Memory Error Section */ 163 static void acpi_ghes_build_append_mem_cper(GArray *table, 164 uint64_t error_physical_addr) 165 { 166 /* 167 * Memory Error Record 168 */ 169 170 /* Validation Bits */ 171 build_append_int_noprefix(table, 172 (1ULL << 14) | /* Type Valid */ 173 (1ULL << 1) /* Physical Address Valid */, 174 8); 175 /* Error Status */ 176 build_append_int_noprefix(table, 0, 8); 177 /* Physical Address */ 178 build_append_int_noprefix(table, error_physical_addr, 8); 179 /* Skip all the detailed information normally found in such a record */ 180 build_append_int_noprefix(table, 0, 48); 181 /* Memory Error Type */ 182 build_append_int_noprefix(table, 0 /* Unknown error */, 1); 183 /* Skip all the detailed information normally found in such a record */ 184 build_append_int_noprefix(table, 0, 7); 185 } 186 187 static int acpi_ghes_record_mem_error(uint64_t error_block_address, 188 uint64_t error_physical_addr) 189 { 190 GArray *block; 191 192 /* Memory Error Section Type */ 193 const uint8_t uefi_cper_mem_sec[] = 194 UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83, \ 195 0xED, 0x7C, 0x83, 0xB1); 196 197 /* invalid fru id: ACPI 4.0: 17.3.2.6.1 Generic Error Data, 198 * Table 17-13 Generic Error Data Entry 199 */ 200 QemuUUID fru_id = {}; 201 uint32_t data_length; 202 203 block = g_array_new(false, true /* clear */, 1); 204 205 /* This is the length if adding a new generic error data entry*/ 206 data_length = ACPI_GHES_DATA_LENGTH + ACPI_GHES_MEM_CPER_LENGTH; 207 /* 208 * It should not run out of the preallocated memory if adding a new generic 209 * error data entry 210 */ 211 assert((data_length + ACPI_GHES_GESB_SIZE) <= 212 ACPI_GHES_MAX_RAW_DATA_LENGTH); 213 214 /* Build the new generic error status block header */ 215 acpi_ghes_generic_error_status(block, ACPI_GEBS_UNCORRECTABLE, 216 0, 0, data_length, ACPI_CPER_SEV_RECOVERABLE); 217 218 /* Build this new generic error data entry header */ 219 acpi_ghes_generic_error_data(block, uefi_cper_mem_sec, 220 ACPI_CPER_SEV_RECOVERABLE, 0, 0, 221 ACPI_GHES_MEM_CPER_LENGTH, fru_id, 0); 222 223 /* Build the memory section CPER for above new generic error data entry */ 224 acpi_ghes_build_append_mem_cper(block, error_physical_addr); 225 226 /* Write the generic error data entry into guest memory */ 227 cpu_physical_memory_write(error_block_address, block->data, block->len); 228 229 g_array_free(block, true); 230 231 return 0; 232 } 233 234 /* 235 * Build table for the hardware error fw_cfg blob. 236 * Initialize "etc/hardware_errors" and "etc/hardware_errors_addr" fw_cfg blobs. 237 * See docs/specs/acpi_hest_ghes.rst for blobs format. 238 */ 239 void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker) 240 { 241 int i, error_status_block_offset; 242 243 /* Build error_block_address */ 244 for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) { 245 build_append_int_noprefix(hardware_errors, 0, sizeof(uint64_t)); 246 } 247 248 /* Build read_ack_register */ 249 for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) { 250 /* 251 * Initialize the value of read_ack_register to 1, so GHES can be 252 * writable after (re)boot. 253 * ACPI 6.2: 18.3.2.8 Generic Hardware Error Source version 2 254 * (GHESv2 - Type 10) 255 */ 256 build_append_int_noprefix(hardware_errors, 1, sizeof(uint64_t)); 257 } 258 259 /* Generic Error Status Block offset in the hardware error fw_cfg blob */ 260 error_status_block_offset = hardware_errors->len; 261 262 /* Reserve space for Error Status Data Block */ 263 acpi_data_push(hardware_errors, 264 ACPI_GHES_MAX_RAW_DATA_LENGTH * ACPI_GHES_ERROR_SOURCE_COUNT); 265 266 /* Tell guest firmware to place hardware_errors blob into RAM */ 267 bios_linker_loader_alloc(linker, ACPI_GHES_ERRORS_FW_CFG_FILE, 268 hardware_errors, sizeof(uint64_t), false); 269 270 for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) { 271 /* 272 * Tell firmware to patch error_block_address entries to point to 273 * corresponding "Generic Error Status Block" 274 */ 275 bios_linker_loader_add_pointer(linker, 276 ACPI_GHES_ERRORS_FW_CFG_FILE, sizeof(uint64_t) * i, 277 sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, 278 error_status_block_offset + i * ACPI_GHES_MAX_RAW_DATA_LENGTH); 279 } 280 281 /* 282 * tell firmware to write hardware_errors GPA into 283 * hardware_errors_addr fw_cfg, once the former has been initialized. 284 */ 285 bios_linker_loader_write_pointer(linker, ACPI_GHES_DATA_ADDR_FW_CFG_FILE, 286 0, sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, 0); 287 } 288 289 /* Build Generic Hardware Error Source version 2 (GHESv2) */ 290 static void build_ghes_v2(GArray *table_data, int source_id, BIOSLinker *linker) 291 { 292 uint64_t address_offset; 293 /* 294 * Type: 295 * Generic Hardware Error Source version 2(GHESv2 - Type 10) 296 */ 297 build_append_int_noprefix(table_data, ACPI_GHES_SOURCE_GENERIC_ERROR_V2, 2); 298 /* Source Id */ 299 build_append_int_noprefix(table_data, source_id, 2); 300 /* Related Source Id */ 301 build_append_int_noprefix(table_data, 0xffff, 2); 302 /* Flags */ 303 build_append_int_noprefix(table_data, 0, 1); 304 /* Enabled */ 305 build_append_int_noprefix(table_data, 1, 1); 306 307 /* Number of Records To Pre-allocate */ 308 build_append_int_noprefix(table_data, 1, 4); 309 /* Max Sections Per Record */ 310 build_append_int_noprefix(table_data, 1, 4); 311 /* Max Raw Data Length */ 312 build_append_int_noprefix(table_data, ACPI_GHES_MAX_RAW_DATA_LENGTH, 4); 313 314 address_offset = table_data->len; 315 /* Error Status Address */ 316 build_append_gas(table_data, AML_AS_SYSTEM_MEMORY, 0x40, 0, 317 4 /* QWord access */, 0); 318 bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE, 319 address_offset + GAS_ADDR_OFFSET, sizeof(uint64_t), 320 ACPI_GHES_ERRORS_FW_CFG_FILE, source_id * sizeof(uint64_t)); 321 322 switch (source_id) { 323 case ACPI_HEST_SRC_ID_SEA: 324 /* 325 * Notification Structure 326 * Now only enable ARMv8 SEA notification type 327 */ 328 build_ghes_hw_error_notification(table_data, ACPI_GHES_NOTIFY_SEA); 329 break; 330 default: 331 error_report("Not support this error source"); 332 abort(); 333 } 334 335 /* Error Status Block Length */ 336 build_append_int_noprefix(table_data, ACPI_GHES_MAX_RAW_DATA_LENGTH, 4); 337 338 /* 339 * Read Ack Register 340 * ACPI 6.1: 18.3.2.8 Generic Hardware Error Source 341 * version 2 (GHESv2 - Type 10) 342 */ 343 address_offset = table_data->len; 344 build_append_gas(table_data, AML_AS_SYSTEM_MEMORY, 0x40, 0, 345 4 /* QWord access */, 0); 346 bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE, 347 address_offset + GAS_ADDR_OFFSET, 348 sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, 349 (ACPI_GHES_ERROR_SOURCE_COUNT + source_id) * sizeof(uint64_t)); 350 351 /* 352 * Read Ack Preserve field 353 * We only provide the first bit in Read Ack Register to OSPM to write 354 * while the other bits are preserved. 355 */ 356 build_append_int_noprefix(table_data, ~0x1ULL, 8); 357 /* Read Ack Write */ 358 build_append_int_noprefix(table_data, 0x1, 8); 359 } 360 361 /* Build Hardware Error Source Table */ 362 void acpi_build_hest(GArray *table_data, BIOSLinker *linker, 363 const char *oem_id, const char *oem_table_id) 364 { 365 AcpiTable table = { .sig = "HEST", .rev = 1, 366 .oem_id = oem_id, .oem_table_id = oem_table_id }; 367 368 acpi_table_begin(&table, table_data); 369 370 /* Error Source Count */ 371 build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4); 372 build_ghes_v2(table_data, ACPI_HEST_SRC_ID_SEA, linker); 373 374 acpi_table_end(linker, &table); 375 } 376 377 void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s, 378 GArray *hardware_error) 379 { 380 /* Create a read-only fw_cfg file for GHES */ 381 fw_cfg_add_file(s, ACPI_GHES_ERRORS_FW_CFG_FILE, hardware_error->data, 382 hardware_error->len); 383 384 /* Create a read-write fw_cfg file for Address */ 385 fw_cfg_add_file_callback(s, ACPI_GHES_DATA_ADDR_FW_CFG_FILE, NULL, NULL, 386 NULL, &(ags->ghes_addr_le), sizeof(ags->ghes_addr_le), false); 387 388 ags->present = true; 389 } 390 391 int acpi_ghes_record_errors(uint8_t source_id, uint64_t physical_address) 392 { 393 uint64_t error_block_addr, read_ack_register_addr, read_ack_register = 0; 394 uint64_t start_addr; 395 bool ret = -1; 396 AcpiGedState *acpi_ged_state; 397 AcpiGhesState *ags; 398 399 assert(source_id < ACPI_HEST_SRC_ID_RESERVED); 400 401 acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED, 402 NULL)); 403 g_assert(acpi_ged_state); 404 ags = &acpi_ged_state->ghes_state; 405 406 start_addr = le64_to_cpu(ags->ghes_addr_le); 407 408 if (physical_address) { 409 410 if (source_id < ACPI_HEST_SRC_ID_RESERVED) { 411 start_addr += source_id * sizeof(uint64_t); 412 } 413 414 cpu_physical_memory_read(start_addr, &error_block_addr, 415 sizeof(error_block_addr)); 416 417 error_block_addr = le64_to_cpu(error_block_addr); 418 419 read_ack_register_addr = start_addr + 420 ACPI_GHES_ERROR_SOURCE_COUNT * sizeof(uint64_t); 421 422 cpu_physical_memory_read(read_ack_register_addr, 423 &read_ack_register, sizeof(read_ack_register)); 424 425 /* zero means OSPM does not acknowledge the error */ 426 if (!read_ack_register) { 427 error_report("OSPM does not acknowledge previous error," 428 " so can not record CPER for current error anymore"); 429 } else if (error_block_addr) { 430 read_ack_register = cpu_to_le64(0); 431 /* 432 * Clear the Read Ack Register, OSPM will write it to 1 when 433 * it acknowledges this error. 434 */ 435 cpu_physical_memory_write(read_ack_register_addr, 436 &read_ack_register, sizeof(uint64_t)); 437 438 ret = acpi_ghes_record_mem_error(error_block_addr, 439 physical_address); 440 } else 441 error_report("can not find Generic Error Status Block"); 442 } 443 444 return ret; 445 } 446 447 bool acpi_ghes_present(void) 448 { 449 AcpiGedState *acpi_ged_state; 450 AcpiGhesState *ags; 451 452 acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED, 453 NULL)); 454 455 if (!acpi_ged_state) { 456 return false; 457 } 458 ags = &acpi_ged_state->ghes_state; 459 return ags->present; 460 } 461