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ACPI / OSL: Add support to install tables via initrd

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This patch adds support to install tables from initrd.

If a table in the initrd wasn't used by the override mechanism,
the table would be installed after initializing all RSDT/XSDT
tables.

Link: https://lkml.org/lkml/2014/2/28/368
Reported-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2016-03-02 14:16:25 +08:00 committed by Rafael J. Wysocki
parent a543132ee0
commit c85cc817e5
3 changed files with 52 additions and 1 deletions
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1
drivers/acpi/internal.h
View File

@ -20,6 +20,7 @@
#define PREFIX "ACPI: "
void acpi_initrd_initialize_tables(void);
acpi_status acpi_os_initialize1(void);
void init_acpi_device_notify(void);
int acpi_scan_init(void);

50
drivers/acpi/osl.c
View File

@ -644,6 +644,7 @@ static const char * const table_sigs[] = {
#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 MAP_CHUNK_SIZE (NR_FIX_BTMAPS << PAGE_SHIFT)
@ -760,6 +761,7 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
acpi_physical_address *address, u32 *length)
{
int table_offset = 0;
int table_index = 0;
struct acpi_table_header *table;
u32 table_length;
@ -780,7 +782,8 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
table_length = table->length;
/* Only override tables matched */
if (memcmp(existing_table->signature, table->signature, 4) ||
if (test_bit(table_index, acpi_initrd_installed) ||
memcmp(existing_table->signature, table->signature, 4) ||
memcmp(table->oem_table_id, existing_table->oem_table_id,
ACPI_OEM_TABLE_ID_SIZE)) {
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
@ -791,13 +794,54 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
*address = acpi_tables_addr + table_offset;
acpi_table_taint(existing_table);
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
set_bit(table_index, acpi_initrd_installed);
break;
next_table:
table_offset += table_length;
table_index++;
}
return AE_OK;
}
void __init acpi_initrd_initialize_tables(void)
{
int table_offset = 0;
int table_index = 0;
u32 table_length;
struct acpi_table_header *table;
if (!acpi_tables_addr)
return;
while (table_offset + ACPI_HEADER_SIZE <= all_tables_size) {
table = acpi_os_map_memory(acpi_tables_addr + table_offset,
ACPI_HEADER_SIZE);
if (table_offset + table->length > all_tables_size) {
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
WARN_ON(1);
return;
}
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) ||
ACPI_COMPARE_NAME(table->signature, ACPI_SIG_XSDT)) {
acpi_os_unmap_memory(table, ACPI_HEADER_SIZE);
goto next_table;
}
acpi_table_taint(table);
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++;
}
}
#else
acpi_status
acpi_os_physical_table_override(struct acpi_table_header *existing_table,
@ -808,6 +852,10 @@ acpi_os_physical_table_override(struct acpi_table_header *existing_table,
*address = 0;
return AE_OK;
}
void __init acpi_initrd_initialize_tables(void)
{
}
#endif /* CONFIG_ACPI_INITRD_TABLE_OVERRIDE */
acpi_status

2
drivers/acpi/tables.c
View File

@ -32,6 +32,7 @@
#include <linux/errno.h>
#include <linux/acpi.h>
#include <linux/bootmem.h>
#include "internal.h"
#define ACPI_MAX_TABLES 128
@ -456,6 +457,7 @@ int __init acpi_table_init(void)
status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
if (ACPI_FAILURE(status))
return -EINVAL;
acpi_initrd_initialize_tables();
check_multiple_madt();
return 0;