@@ -32,6 +32,10 @@ configuration::
CONFIG_ACPI_APEI
CONFIG_ACPI_APEI_EINJ
+...and to (optionally) enable CXL protocol error injection set::
+
+ CONFIG_ACPI_APEI_EINJ_CXL
+
The EINJ user interface is in <debugfs mount point>/apei/einj.
The following files belong to it:
@@ -118,6 +122,24 @@ The following files belong to it:
this actually works depends on what operations the BIOS actually
includes in the trigger phase.
+CXL error types are supported from ACPI 6.5 onwards (given a CXL port
+is present). The EINJ user interface for CXL error types is at
+<debugfs mount point>/cxl. The following files belong to it:
+
+- einj_types:
+
+ Provides the same functionality as available_error_types above, but
+ for CXL error types
+
+- $dport_dev/einj_inject:
+
+ Injects a CXL error type into the CXL port represented by $dport_dev,
+ where $dport_dev is the name of the CXL port (usually a PCIe device name).
+ Error injections targeting a CXL 2.0+ port can use the legacy interface
+ under <debugfs mount point>/apei/einj, while CXL 1.1/1.0 port injections
+ must use this file.
+
+
BIOS versions based on the ACPI 4.0 specification have limited options
in controlling where the errors are injected. Your BIOS may support an
extension (enabled with the param_extension=1 module parameter, or boot
@@ -181,6 +203,18 @@ 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)
+A CXL error injection example with $dport_dev=0000:e0:01.1::
+
+ # cd /sys/kernel/debug/cxl/
+ # ls
+ 0000:e0:01.1 0000:0c:00.0
+ # cat einj_types # See which errors 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
+
Special notes for injection into SGX enclaves:
There may be a separate BIOS setup option to enable SGX injection.