On Mon, 25 Sep 2023 15:01:27 -0500 Ben Cheatham <Benjamin.Cheatham@xxxxxxx> wrote: > 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> A trivial comment inline. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > --- > .../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 > + #Unrelated change. Probably reasonable but should be separate patch really. > 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.
