On Sun, 26 Jan 2025 at 03:08, Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx> wrote:
>
> Commit 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM
> handler and context") added unnecessary strict handler address checks,
> caused the PRM module to fail in translating memory error addresses.
>
> Both static data buffer address and acpi parameter buffer address may
> be NULL if they are not needed, as described in section 4.1.2 PRM Handler
> Information Structure of Platform Runtime Mechanism specification [1].
>
> Here are two examples from real hardware:
>
> ----PRMT.dsl----
>
> - staic data address is not used
> [10Ch 0268 2] Revision : 0000
> [10Eh 0270 2] Length : 002C
> [110h 0272 16] Handler GUID : F6A58D47-E04F-4F5A-86B8-2A50D4AA109B
> [120h 0288 8] Handler address : 0000000065CE51F4
> [128h 0296 8] Satic Data Address : 0000000000000000
> [130h 0304 8] ACPI Parameter Address : 000000006522A718
>
> - ACPI parameter address is not used
> [1B0h 0432 2] Revision : 0000
> [1B2h 0434 2] Length : 002C
> [1B4h 0436 16] Handler GUID : 657E8AE6-A8FC-4877-BB28-42E7DE1899A5
> [1C4h 0452 8] Handler address : 0000000065C567C8
> [1CCh 0460 8] Satic Data Address : 000000006113FB98
> [1D4h 0468 8] ACPI Parameter Address : 0000000000000000
>
> Fixes: 088984c8d54c ("ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context")
> Reported-and-tested-by: Shi Liu <aurelianliu@xxxxxxxxxxx>
> Cc: All applicable <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Aubrey Li <aubrey.li@xxxxxxxxxxxxxxx>
> Link: https://uefi.org/sites/default/files/resources/Platform%20Runtime%20Mechanism%20-%20with%20legal%20notice.pdf # [1]
> ---
> drivers/acpi/prmt.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
> diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
> index 747f83f7114d..e549914a636c 100644
> --- a/drivers/acpi/prmt.c
> +++ b/drivers/acpi/prmt.c
> @@ -287,9 +287,7 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
> if (!handler || !module)
> goto invalid_guid;
>
> - if (!handler->handler_addr ||
> - !handler->static_data_buffer_addr ||
> - !handler->acpi_param_buffer_addr) {
> + if (!handler->handler_addr) {
> buffer->prm_status = PRM_HANDLER_ERROR;
> return AE_OK;
> }
> --
> 2.34.1
>
