diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/acpi/tables.c | 48 |
2 files changed, 38 insertions, 18 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 82b96ee8624c..b225c4b9ba14 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -311,12 +311,12 @@ config ACPI_CUSTOM_DSDT bool default ACPI_CUSTOM_DSDT_FILE != "" -config ACPI_INITRD_TABLE_OVERRIDE - bool "ACPI tables override via initrd" +config ACPI_TABLE_UPGRADE + bool "Allow upgrading ACPI tables via initrd" depends on BLK_DEV_INITRD && X86 - default n + default y help - This option provides functionality to override arbitrary ACPI tables + This option provides functionality to upgrade arbitrary ACPI tables via initrd. No functional change if no ACPI tables are passed via initrd, therefore it's safe to say Y. See Documentation/acpi/initrd_table_override.txt for details diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index 2e74dbf45dd4..08795fbde3fa 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -442,7 +442,7 @@ static void acpi_table_taint(struct acpi_table_header *table) add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE); } -#ifdef CONFIG_ACPI_INITRD_TABLE_OVERRIDE +#ifdef CONFIG_ACPI_TABLE_UPGRADE static u64 acpi_tables_addr; static int all_tables_size; @@ -471,9 +471,9 @@ static const char * const table_sigs[] = { #define ACPI_HEADER_SIZE sizeof(struct acpi_table_header) -#define ACPI_OVERRIDE_TABLES 64 -static struct cpio_data __initdata acpi_initrd_files[ACPI_OVERRIDE_TABLES]; -static DECLARE_BITMAP(acpi_initrd_installed, ACPI_OVERRIDE_TABLES); +#define NR_ACPI_INITRD_TABLES 64 +static struct cpio_data __initdata acpi_initrd_files[NR_ACPI_INITRD_TABLES]; +static DECLARE_BITMAP(acpi_initrd_installed, NR_ACPI_INITRD_TABLES); #define MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT) @@ -488,7 +488,7 @@ static void __init acpi_table_initrd_init(void *data, size_t size) if (data == NULL || size == 0) return; - for (no = 0; no < ACPI_OVERRIDE_TABLES; no++) { + for (no = 0; no < NR_ACPI_INITRD_TABLES; no++) { file = find_cpio_data(cpio_path, data, size, &offset); if (!file.data) break; @@ -611,19 +611,30 @@ acpi_table_initrd_override(struct acpi_table_header *existing_table, table_length = table->length; /* Only override tables matched */ - if (test_bit(table_index, acpi_initrd_installed) || - memcmp(existing_table->signature, table->signature, 4) || + if (memcmp(existing_table->signature, table->signature, 4) || + memcmp(table->oem_id, existing_table->oem_id, + ACPI_OEM_ID_SIZE) || memcmp(table->oem_table_id, existing_table->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); goto next_table; } + /* + * Mark the table to avoid being used in + * acpi_table_initrd_scan() and check the revision. + */ + if (test_and_set_bit(table_index, acpi_initrd_installed) || + existing_table->oem_revision >= table->oem_revision) { + acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); + goto next_table; + } *length = table_length; *address = acpi_tables_addr + table_offset; - acpi_table_taint(existing_table); + pr_info("Table Upgrade: override [%4.4s-%6.6s-%8.8s]\n", + table->signature, table->oem_id, + table->oem_table_id); acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); - set_bit(table_index, acpi_initrd_installed); break; next_table: @@ -655,17 +666,26 @@ static void __init acpi_table_initrd_scan(void) table_length = table->length; /* Skip RSDT/XSDT which should only be used for override */ - if (test_bit(table_index, acpi_initrd_installed) || - ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) || + if (ACPI_COMPARE_NAME(table->signature, ACPI_SIG_RSDT) || ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) { acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); goto next_table; } + /* + * Mark the table to avoid being used in + * acpi_table_initrd_override(). Though this is not possible + * because override is disabled in acpi_install_table(). + */ + if (test_and_set_bit(table_index, acpi_initrd_installed)) { + acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); + goto next_table; + } - acpi_table_taint(table); + pr_info("Table Upgrade: install [%4.4s-%6.6s-%8.8s]\n", + table->signature, table->oem_id, + table->oem_table_id); acpi_os_unmap_memory(table, ACPI_HEADER_SIZE); acpi_install_table(acpi_tables_addr + table_offset, TRUE); - set_bit(table_index, acpi_initrd_installed); next_table: table_offset += table_length; table_index++; @@ -689,7 +709,7 @@ acpi_table_initrd_override(struct acpi_table_header *existing_table, static void __init acpi_table_initrd_scan(void) { } -#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */ +#endif /* CONFIG_ACPI_TABLE_UPGRADE */ acpi_status acpi_os_physical_table_override(struct acpi_table_header *existing_table, |