On Friday, August 02, 2013 05:14:26 PM Tang Chen wrote:
> Besides the phys addr of the acpi tables, it will be very convenient if
> we also have the signature of each table in acpi_gbl_root_table_list at
> early time. We can find SRAT easily by comparing the signature.
>
> This patch alse record signature and some other info in
> acpi_gbl_root_table_list at early time.
>
> Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
> Reviewed-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
The subject is misleading, as the change is in ACPICA and therefore affects not
only x86.
Also I think the same comments as for the other ACPICA patch is this series
applies: You shouldn't modify acpi_tbl_parse_root_table() in ways that would
require the other OSes using ACPICA to be modified.
> ---
> drivers/acpi/acpica/tbutils.c | 22 ++++++++++++++++++++++
> 1 files changed, 22 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
> index e3621cf..af942fe 100644
> --- a/drivers/acpi/acpica/tbutils.c
> +++ b/drivers/acpi/acpica/tbutils.c
> @@ -438,6 +438,7 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
> u32 i;
> u32 table_count;
> struct acpi_table_header *table;
> + struct acpi_table_desc *table_desc;
> acpi_physical_address address;
> acpi_physical_address uninitialized_var(rsdt_address);
> u32 length;
> @@ -577,6 +578,27 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
> */
> acpi_os_unmap_memory(table, length);
>
> + /*
> + * Also initialize the table entries here, so that later we can use them
> + * to find SRAT at very eraly time to reserve hotpluggable memory.
> + */
> + for (i = 2; i < acpi_gbl_root_table_list.current_table_count; i++) {
> + table = acpi_os_map_memory(
> + acpi_gbl_root_table_list.tables[i].address,
> + sizeof(struct acpi_table_header));
> + if (!table)
> + return_ACPI_STATUS(AE_NO_MEMORY);
> +
> + table_desc = &acpi_gbl_root_table_list.tables[i];
> +
> + table_desc->pointer = NULL;
> + table_desc->length = table->length;
> + table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED;
> + ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
> +
> + acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
> + }
> +
> return_ACPI_STATUS(AE_OK);
> }
Thanks,
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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