cxl/events: Trace Memory Sparing Event Record

CXL rev 3.2 section 8.2.10.2.1.4 Table 8-60 defines the Memory Sparing
Event Record.

Determine if the event read is memory sparing record and if so trace the
record.

Memory device shall produce a memory sparing event record
1. After completion of a PPR maintenance operation if the memory sparing
event record enable bit is set (Field: sPPR/hPPR Operation Mode in
Table 8-128/Table 8-131).
2. In response to a query request by the host (see section 8.2.10.7.1.4)
to determine the availability of sparing resources.
The device shall report the resource availability by producing the Memory
Sparing Event Record (see Table 8-60) in which the channel, rank, nibble
mask, bank group, bank, row, column, sub-channel fields are a copy of the
values specified in the request. If the controller does not support
reporting whether a resource is available, and a perform maintenance
operation for memory sparing is issued with query resources set to 1, the
controller shall return invalid input.

Example trace log for produce memory sparing event record on completion
of a soft PPR operation,
cxl_memory_sparing: memdev=mem1 host=0000:0f:00.0 serial=3
log=Informational : time=55045163029
uuid=e71f3a40-2d29-4092-8a39-4d1c966c7c65 len=128 flags='0x1' handle=1
related_handle=0 maint_op_class=2 maint_op_sub_class=1
ld_id=0 head_id=0 : flags='' result=0
validity_flags='CHANNEL|RANK|NIBBLE|BANK GROUP|BANK|ROW|COLUMN'
spare resource avail=1 channel=2 rank=5 nibble_mask=a59c bank_group=2
bank=4 row=13 column=23 sub_channel=0
comp_id=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
comp_id_pldm_valid_flags='' pldm_entity_id=0x00 pldm_resource_id=0x00

Note: For memory sparing event record, fields 'maintenance operation
class' and 'maintenance operation subclass' are defined twice, first
in the common event record (Table 8-55) and second in the memory
sparing event record (Table 8-60). Thus those in the sparing event
record coded as reserved, to be removed when the spec is updated.

Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
Link: https://patch.msgid.link/20250717101817.2104-5-shiju.jose@huawei.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/include/cxl/event.h b/include/cxl/event.h
index f4cb8568566b..6fd90f9cc203 100644
--- a/include/cxl/event.h
+++ b/include/cxl/event.h
@@ -110,11 +110,43 @@ struct cxl_event_mem_module {
 	u8 reserved[0x2a];
 } __packed;
 
+/*
+ * Memory Sparing Event Record - MSER
+ * CXL rev 3.2 section 8.2.10.2.1.4; Table 8-60
+ */
+struct cxl_event_mem_sparing {
+	struct cxl_event_record_hdr hdr;
+	/*
+	 * The fields maintenance operation class and maintenance operation
+	 * subclass defined in the Memory Sparing Event Record are the
+	 * duplication of the same in the common event record. Thus defined
+	 * as reserved and to be removed after the spec correction.
+	 */
+	u8 rsv1;
+	u8 rsv2;
+	u8 flags;
+	u8 result;
+	__le16 validity_flags;
+	u8 reserved1[6];
+	__le16 res_avail;
+	u8 channel;
+	u8 rank;
+	u8 nibble_mask[3];
+	u8 bank_group;
+	u8 bank;
+	u8 row[3];
+	__le16 column;
+	u8 component_id[CXL_EVENT_GEN_MED_COMP_ID_SIZE];
+	u8 sub_channel;
+	u8 reserved2[0x25];
+} __packed;
+
 union cxl_event {
 	struct cxl_event_generic generic;
 	struct cxl_event_gen_media gen_media;
 	struct cxl_event_dram dram;
 	struct cxl_event_mem_module mem_module;
+	struct cxl_event_mem_sparing mem_sparing;
 	/* dram & gen_media event header */
 	struct cxl_event_media_hdr media_hdr;
 } __packed;
@@ -133,6 +165,7 @@ enum cxl_event_type {
 	CXL_CPER_EVENT_GEN_MEDIA,
 	CXL_CPER_EVENT_DRAM,
 	CXL_CPER_EVENT_MEM_MODULE,
+	CXL_CPER_EVENT_MEM_SPARING,
 };
 
 #define CPER_CXL_DEVICE_ID_VALID		BIT(0)