On Thu, 8 Feb 2024 14:00:42 -0600 Ben Cheatham <Benjamin.Cheatham@xxxxxxx> wrote: > Update EINJ kernel document to include how to inject CXL protocol error > types, build the kernel to include CXL error types, and give an example > injection. > > Reviewed-by: Dan Williams <dan.j.williams@xxxxxxxxx> > Signed-off-by: Ben Cheatham <Benjamin.Cheatham@xxxxxxx> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > --- > .../firmware-guide/acpi/apei/einj.rst | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/Documentation/firmware-guide/acpi/apei/einj.rst b/Documentation/firmware-guide/acpi/apei/einj.rst > index d6b61d22f525..f179adf7b61c 100644 > --- a/Documentation/firmware-guide/acpi/apei/einj.rst > +++ b/Documentation/firmware-guide/acpi/apei/einj.rst > @@ -181,6 +181,25 @@ You should see something like this in dmesg:: > [22715.834759] EDAC sbridge MC3: PROCESSOR 0:306e7 TIME 1422553404 SOCKET 0 APIC 0 > [22716.616173] EDAC MC3: 1 CE memory read error on CPU_SrcID#0_Channel#0_DIMM#0 (channel:0 slot:0 page:0x12345 offset:0x0 grain:32 syndrome:0x0 - area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0) > > +CXL error types are supported from ACPI 6.5 onwards. These error types > +are not available in the legacy interface at /sys/kernel/debug/apei/einj, > +and are instead at /sys/kernel/debug/cxl/. There is a file under debug/cxl > +called "einj_type" that is analogous to available_error_type under debug/cxl. > +There is also a "einj_inject" file in each $dport_dev directory under debug/cxl > +that will inject a given error into the dport represented by $dport_dev. > +For example, to inject a CXL.mem protocol correctable error into > +$dport_dev=pci0000:0c:: > + > + # cd /sys/kernel/debug/cxl/ > + # cat einj_type # See which error can be injected > + 0x00008000 CXL.mem Protocol Correctable > + 0x00010000 CXL.mem Protocol Uncorrectable non-fatal > + 0x00020000 CXL.mem Protocol Uncorrectable fatal > + # cd 0000:e0:01.1 # Navigate to dport to inject into > + # echo 0x8000 > einj_inject # Inject error > + > +To use CXL error types, ``CONFIG_CXL_EINJ`` will need to be enabled. > + > Special notes for injection into SGX enclaves: > > There may be a separate BIOS setup option to enable SGX injection.
