/* * Support for generating APEI tables and recording CPER for Guests * * Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD. * * Author: Dongjiu Geng * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * You should have received a copy of the GNU General Public License along * with this program; if not, see . */ #include "qemu/osdep.h" #include "qemu/units.h" #include "hw/acpi/ghes.h" #include "hw/acpi/aml-build.h" #include "qemu/error-report.h" #include "hw/acpi/generic_event_device.h" #include "hw/nvram/fw_cfg.h" #include "qemu/uuid.h" #define ACPI_GHES_ERRORS_FW_CFG_FILE "etc/hardware_errors" #define ACPI_GHES_DATA_ADDR_FW_CFG_FILE "etc/hardware_errors_addr" /* The max size in bytes for one error block */ #define ACPI_GHES_MAX_RAW_DATA_LENGTH (1 * KiB) /* Now only support ARMv8 SEA notification type error source */ #define ACPI_GHES_ERROR_SOURCE_COUNT 1 /* Generic Hardware Error Source version 2 */ #define ACPI_GHES_SOURCE_GENERIC_ERROR_V2 10 /* Address offset in Generic Address Structure(GAS) */ #define GAS_ADDR_OFFSET 4 /* * The total size of Generic Error Data Entry * ACPI 6.1/6.2: 18.3.2.7.1 Generic Error Data, * Table 18-343 Generic Error Data Entry */ #define ACPI_GHES_DATA_LENGTH 72 /* The memory section CPER size, UEFI 2.6: N.2.5 Memory Error Section */ #define ACPI_GHES_MEM_CPER_LENGTH 80 /* Masks for block_status flags */ #define ACPI_GEBS_UNCORRECTABLE 1 /* * Total size for Generic Error Status Block except Generic Error Data Entries * ACPI 6.2: 18.3.2.7.1 Generic Error Data, * Table 18-380 Generic Error Status Block */ #define ACPI_GHES_GESB_SIZE 20 /* * Values for error_severity field */ enum AcpiGenericErrorSeverity { ACPI_CPER_SEV_RECOVERABLE = 0, ACPI_CPER_SEV_FATAL = 1, ACPI_CPER_SEV_CORRECTED = 2, ACPI_CPER_SEV_NONE = 3, }; /* * Hardware Error Notification * ACPI 4.0: 17.3.2.7 Hardware Error Notification * Composes dummy Hardware Error Notification descriptor of specified type */ static void build_ghes_hw_error_notification(GArray *table, const uint8_t type) { /* Type */ build_append_int_noprefix(table, type, 1); /* * Length: * Total length of the structure in bytes */ build_append_int_noprefix(table, 28, 1); /* Configuration Write Enable */ build_append_int_noprefix(table, 0, 2); /* Poll Interval */ build_append_int_noprefix(table, 0, 4); /* Vector */ build_append_int_noprefix(table, 0, 4); /* Switch To Polling Threshold Value */ build_append_int_noprefix(table, 0, 4); /* Switch To Polling Threshold Window */ build_append_int_noprefix(table, 0, 4); /* Error Threshold Value */ build_append_int_noprefix(table, 0, 4); /* Error Threshold Window */ build_append_int_noprefix(table, 0, 4); } /* * Generic Error Data Entry * ACPI 6.1: 18.3.2.7.1 Generic Error Data */ static void acpi_ghes_generic_error_data(GArray *table, const uint8_t *section_type, uint32_t error_severity, uint8_t validation_bits, uint8_t flags, uint32_t error_data_length, QemuUUID fru_id, uint64_t time_stamp) { const uint8_t fru_text[20] = {0}; /* Section Type */ g_array_append_vals(table, section_type, 16); /* Error Severity */ build_append_int_noprefix(table, error_severity, 4); /* Revision */ build_append_int_noprefix(table, 0x300, 2); /* Validation Bits */ build_append_int_noprefix(table, validation_bits, 1); /* Flags */ build_append_int_noprefix(table, flags, 1); /* Error Data Length */ build_append_int_noprefix(table, error_data_length, 4); /* FRU Id */ g_array_append_vals(table, fru_id.data, ARRAY_SIZE(fru_id.data)); /* FRU Text */ g_array_append_vals(table, fru_text, sizeof(fru_text)); /* Timestamp */ build_append_int_noprefix(table, time_stamp, 8); } /* * Generic Error Status Block * ACPI 6.1: 18.3.2.7.1 Generic Error Data */ static void acpi_ghes_generic_error_status(GArray *table, uint32_t block_status, uint32_t raw_data_offset, uint32_t raw_data_length, uint32_t data_length, uint32_t error_severity) { /* Block Status */ build_append_int_noprefix(table, block_status, 4); /* Raw Data Offset */ build_append_int_noprefix(table, raw_data_offset, 4); /* Raw Data Length */ build_append_int_noprefix(table, raw_data_length, 4); /* Data Length */ build_append_int_noprefix(table, data_length, 4); /* Error Severity */ build_append_int_noprefix(table, error_severity, 4); } /* UEFI 2.6: N.2.5 Memory Error Section */ static void acpi_ghes_build_append_mem_cper(GArray *table, uint64_t error_physical_addr) { /* * Memory Error Record */ /* Validation Bits */ build_append_int_noprefix(table, (1ULL << 14) | /* Type Valid */ (1ULL << 1) /* Physical Address Valid */, 8); /* Error Status */ build_append_int_noprefix(table, 0, 8); /* Physical Address */ build_append_int_noprefix(table, error_physical_addr, 8); /* Skip all the detailed information normally found in such a record */ build_append_int_noprefix(table, 0, 48); /* Memory Error Type */ build_append_int_noprefix(table, 0 /* Unknown error */, 1); /* Skip all the detailed information normally found in such a record */ build_append_int_noprefix(table, 0, 7); } static int acpi_ghes_record_mem_error(uint64_t error_block_address, uint64_t error_physical_addr) { GArray *block; /* Memory Error Section Type */ const uint8_t uefi_cper_mem_sec[] = UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83, \ 0xED, 0x7C, 0x83, 0xB1); /* invalid fru id: ACPI 4.0: 17.3.2.6.1 Generic Error Data, * Table 17-13 Generic Error Data Entry */ QemuUUID fru_id = {}; uint32_t data_length; block = g_array_new(false, true /* clear */, 1); /* This is the length if adding a new generic error data entry*/ data_length = ACPI_GHES_DATA_LENGTH + ACPI_GHES_MEM_CPER_LENGTH; /* * Check whether it will run out of the preallocated memory if adding a new * generic error data entry */ if ((data_length + ACPI_GHES_GESB_SIZE) > ACPI_GHES_MAX_RAW_DATA_LENGTH) { error_report("Not enough memory to record new CPER!!!"); g_array_free(block, true); return -1; } /* Build the new generic error status block header */ acpi_ghes_generic_error_status(block, ACPI_GEBS_UNCORRECTABLE, 0, 0, data_length, ACPI_CPER_SEV_RECOVERABLE); /* Build this new generic error data entry header */ acpi_ghes_generic_error_data(block, uefi_cper_mem_sec, ACPI_CPER_SEV_RECOVERABLE, 0, 0, ACPI_GHES_MEM_CPER_LENGTH, fru_id, 0); /* Build the memory section CPER for above new generic error data entry */ acpi_ghes_build_append_mem_cper(block, error_physical_addr); /* Write the generic error data entry into guest memory */ cpu_physical_memory_write(error_block_address, block->data, block->len); g_array_free(block, true); return 0; } /* * Build table for the hardware error fw_cfg blob. * Initialize "etc/hardware_errors" and "etc/hardware_errors_addr" fw_cfg blobs. * See docs/specs/acpi_hest_ghes.rst for blobs format. */ void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker) { int i, error_status_block_offset; /* Build error_block_address */ for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) { build_append_int_noprefix(hardware_errors, 0, sizeof(uint64_t)); } /* Build read_ack_register */ for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) { /* * Initialize the value of read_ack_register to 1, so GHES can be * writeable after (re)boot. * ACPI 6.2: 18.3.2.8 Generic Hardware Error Source version 2 * (GHESv2 - Type 10) */ build_append_int_noprefix(hardware_errors, 1, sizeof(uint64_t)); } /* Generic Error Status Block offset in the hardware error fw_cfg blob */ error_status_block_offset = hardware_errors->len; /* Reserve space for Error Status Data Block */ acpi_data_push(hardware_errors, ACPI_GHES_MAX_RAW_DATA_LENGTH * ACPI_GHES_ERROR_SOURCE_COUNT); /* Tell guest firmware to place hardware_errors blob into RAM */ bios_linker_loader_alloc(linker, ACPI_GHES_ERRORS_FW_CFG_FILE, hardware_errors, sizeof(uint64_t), false); for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) { /* * Tell firmware to patch error_block_address entries to point to * corresponding "Generic Error Status Block" */ bios_linker_loader_add_pointer(linker, ACPI_GHES_ERRORS_FW_CFG_FILE, sizeof(uint64_t) * i, sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, error_status_block_offset + i * ACPI_GHES_MAX_RAW_DATA_LENGTH); } /* * tell firmware to write hardware_errors GPA into * hardware_errors_addr fw_cfg, once the former has been initialized. */ bios_linker_loader_write_pointer(linker, ACPI_GHES_DATA_ADDR_FW_CFG_FILE, 0, sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, 0); } /* Build Generic Hardware Error Source version 2 (GHESv2) */ static void build_ghes_v2(GArray *table_data, int source_id, BIOSLinker *linker) { uint64_t address_offset; /* * Type: * Generic Hardware Error Source version 2(GHESv2 - Type 10) */ build_append_int_noprefix(table_data, ACPI_GHES_SOURCE_GENERIC_ERROR_V2, 2); /* Source Id */ build_append_int_noprefix(table_data, source_id, 2); /* Related Source Id */ build_append_int_noprefix(table_data, 0xffff, 2); /* Flags */ build_append_int_noprefix(table_data, 0, 1); /* Enabled */ build_append_int_noprefix(table_data, 1, 1); /* Number of Records To Pre-allocate */ build_append_int_noprefix(table_data, 1, 4); /* Max Sections Per Record */ build_append_int_noprefix(table_data, 1, 4); /* Max Raw Data Length */ build_append_int_noprefix(table_data, ACPI_GHES_MAX_RAW_DATA_LENGTH, 4); address_offset = table_data->len; /* Error Status Address */ build_append_gas(table_data, AML_AS_SYSTEM_MEMORY, 0x40, 0, 4 /* QWord access */, 0); bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE, address_offset + GAS_ADDR_OFFSET, sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, source_id * sizeof(uint64_t)); switch (source_id) { case ACPI_HEST_SRC_ID_SEA: /* * Notification Structure * Now only enable ARMv8 SEA notification type */ build_ghes_hw_error_notification(table_data, ACPI_GHES_NOTIFY_SEA); break; default: error_report("Not support this error source"); abort(); } /* Error Status Block Length */ build_append_int_noprefix(table_data, ACPI_GHES_MAX_RAW_DATA_LENGTH, 4); /* * Read Ack Register * ACPI 6.1: 18.3.2.8 Generic Hardware Error Source * version 2 (GHESv2 - Type 10) */ address_offset = table_data->len; build_append_gas(table_data, AML_AS_SYSTEM_MEMORY, 0x40, 0, 4 /* QWord access */, 0); bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE, address_offset + GAS_ADDR_OFFSET, sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, (ACPI_GHES_ERROR_SOURCE_COUNT + source_id) * sizeof(uint64_t)); /* * Read Ack Preserve field * We only provide the first bit in Read Ack Register to OSPM to write * while the other bits are preserved. */ build_append_int_noprefix(table_data, ~0x1ULL, 8); /* Read Ack Write */ build_append_int_noprefix(table_data, 0x1, 8); } /* Build Hardware Error Source Table */ void acpi_build_hest(GArray *table_data, BIOSLinker *linker) { uint64_t hest_start = table_data->len; /* Hardware Error Source Table header*/ acpi_data_push(table_data, sizeof(AcpiTableHeader)); /* Error Source Count */ build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4); build_ghes_v2(table_data, ACPI_HEST_SRC_ID_SEA, linker); build_header(linker, table_data, (void *)(table_data->data + hest_start), "HEST", table_data->len - hest_start, 1, NULL, NULL); } void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s, GArray *hardware_error) { /* Create a read-only fw_cfg file for GHES */ fw_cfg_add_file(s, ACPI_GHES_ERRORS_FW_CFG_FILE, hardware_error->data, hardware_error->len); /* Create a read-write fw_cfg file for Address */ fw_cfg_add_file_callback(s, ACPI_GHES_DATA_ADDR_FW_CFG_FILE, NULL, NULL, NULL, &(ags->ghes_addr_le), sizeof(ags->ghes_addr_le), false); } int acpi_ghes_record_errors(uint8_t source_id, uint64_t physical_address) { uint64_t error_block_addr, read_ack_register_addr, read_ack_register = 0; uint64_t start_addr; bool ret = -1; AcpiGedState *acpi_ged_state; AcpiGhesState *ags; assert(source_id < ACPI_HEST_SRC_ID_RESERVED); acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED, NULL)); g_assert(acpi_ged_state); ags = &acpi_ged_state->ghes_state; start_addr = le64_to_cpu(ags->ghes_addr_le); if (physical_address) { if (source_id < ACPI_HEST_SRC_ID_RESERVED) { start_addr += source_id * sizeof(uint64_t); } cpu_physical_memory_read(start_addr, &error_block_addr, sizeof(error_block_addr)); error_block_addr = le64_to_cpu(error_block_addr); read_ack_register_addr = start_addr + ACPI_GHES_ERROR_SOURCE_COUNT * sizeof(uint64_t); cpu_physical_memory_read(read_ack_register_addr, &read_ack_register, sizeof(read_ack_register)); /* zero means OSPM does not acknowledge the error */ if (!read_ack_register) { error_report("OSPM does not acknowledge previous error," " so can not record CPER for current error anymore"); } else if (error_block_addr) { read_ack_register = cpu_to_le64(0); /* * Clear the Read Ack Register, OSPM will write it to 1 when * it acknowledges this error. */ cpu_physical_memory_write(read_ack_register_addr, &read_ack_register, sizeof(uint64_t)); ret = acpi_ghes_record_mem_error(error_block_addr, physical_address); } else error_report("can not find Generic Error Status Block"); } return ret; }