On 12/15/2023 3:26 PM, Ira Weiny wrote:
BIOS can configure memory devices as firmware first. This will send CXL
events to the firmware instead of the OS. The firmware can then send
these events to the OS via UEFI.
UEFI v2.10 section N.2.14 defines a Common Platform Error Record (CPER)
format for CXL Component Events. The format is mostly the same as the
CXL Common Event Record Format. The difference is the use of a GUID in
the Section Type rather than a UUID as part of the event itself.
Add EFI support to detect CXL CPER records and call a registered
notifier with the event. Enforce that only one notifier call can be
registered at any time.
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
[snip]
+ struct {
+ u32 length;
+ u64 validation_bits;
+ struct cper_cxl_event_devid {
+ u16 vendor_id;
+ u16 device_id;
+ u8 func_num;
+ u8 device_num;
+ u8 bus_num;
+ u16 segment_num;
+ u16 slot_num; /* bits 2:0 reserved */
+ u8 reserved;
+ } device_id __packed;
+ struct cper_cxl_event_sn {
+ u32 lower_dw;
+ u32 upper_dw;
+ } dev_serial_num __packed;
+ } hdr __packed;
+
+ union cxl_event event;
+} __packed;
+
For some reason, prefixing the struct name with __packed attribute seems
to do the job. ("__packed device_id" and "__packed dev_serial_num").
Thanks,
Smita
