Update EINJ documentation to include CXL errors in available_error_types table and usage of the types. Also fix a formatting error in the param4 file description that caused the description to be on the same line as the bullet point. Signed-off-by: Ben Cheatham <Benjamin.Cheatham@xxxxxxx> --- .../firmware-guide/acpi/apei/einj.rst | 25 ++++++++++++++++--- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/Documentation/firmware-guide/acpi/apei/einj.rst b/Documentation/firmware-guide/acpi/apei/einj.rst index d6b61d22f525..c6f28118c48b 100644 --- a/Documentation/firmware-guide/acpi/apei/einj.rst +++ b/Documentation/firmware-guide/acpi/apei/einj.rst @@ -32,6 +32,9 @@ configuration:: CONFIG_ACPI_APEI CONFIG_ACPI_APEI_EINJ +To use CXL error types ``CONFIG_CXL_ACPI`` needs to be set to the same +value as ``CONFIG_ACPI_APEI_EINJ`` (either "y" or "m"). + The EINJ user interface is in <debugfs mount point>/apei/einj. The following files belong to it: @@ -40,9 +43,9 @@ The following files belong to it: This file shows which error types are supported: - ================ =================================== + ================ ========================================= Error Type Value Error Description - ================ =================================== + ================ ========================================= 0x00000001 Processor Correctable 0x00000002 Processor Uncorrectable non-fatal 0x00000004 Processor Uncorrectable fatal @@ -55,7 +58,13 @@ The following files belong to it: 0x00000200 Platform Correctable 0x00000400 Platform Uncorrectable non-fatal 0x00000800 Platform Uncorrectable fatal - ================ =================================== + 0x00001000 CXL.cache Protocol Correctable + 0x00002000 CXL.cache Protocol Uncorrectable non-fatal + 0x00004000 CXL.cache Protocol Uncorrectable fatal + 0x00008000 CXL.mem Protocol Correctable + 0x00010000 CXL.mem Protocol Uncorrectable non-fatal + 0x00020000 CXL.mem Protocol Uncorrectable fatal + ================ ========================================= The format of the file contents are as above, except present are only the available error types. @@ -106,6 +115,7 @@ The following files belong to it: Used when the 0x1 bit is set in "flags" to specify the APIC id - param4 + Used when the 0x4 bit is set in "flags" to specify target PCIe device - notrigger @@ -159,6 +169,13 @@ and param2 (1 = PROCESSOR, 2 = MEMORY, 4 = PCI). See your BIOS vendor documentation for details (and expect changes to this API if vendors creativity in using this feature expands beyond our expectations). +CXL error types are supported from ACPI 6.5 onwards. To use these error +types you need the MMIO address of a CXL 1.1 downstream port. You can +find the address of dportY in /sys/bus/cxl/devices/portX/dportY/cxl_rcrb_addr +(it's possible that the dport is under the CXL root, in that case the +path would be /sys/us/cxl/devices/rootX/dportY/cxl_rcrb_addr). +From there, write the address to param1 and continue as you would for a +memory error type. An error injection example:: @@ -201,4 +218,4 @@ The following sequence can be used: 7) Read from the virtual address. This will trigger the error For more information about EINJ, please refer to ACPI specification -version 4.0, section 17.5 and ACPI 5.0, section 18.6. +version 4.0, section 17.5 and ACPI 6.5, section 18.6. -- 2.34.1
