Messages in this thread Patch in this message | | | From | ira.weiny@intel ... | Subject | [RFC PATCH 2/9] cxl/mem: Implement Clear Event Records command | Date | Fri, 12 Aug 2022 22:32:36 -0700 |
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From: Ira Weiny <ira.weiny@intel.com>
CXL v3.0 section 8.2.9.2.3 defines the Clear Event Records mailbox command. After an event record is read it needs to be cleared from the event log.
Implement cxl_clear_event_record() and call it for each record retrieved from the device.
Each record is cleared individually. A clear all bit is specified but events could arrive between a get and the final clear all operation. Therefore each event is cleared specifically.
Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- drivers/cxl/core/mbox.c | 31 ++++++++++++++++++++++++++++--- drivers/cxl/cxlmem.h | 15 +++++++++++++++ include/uapi/linux/cxl_mem.h | 1 + 3 files changed, 44 insertions(+), 3 deletions(-)
diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 2cceed8608dc..493f5ceb5d1c 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -52,6 +52,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = { #endif CXL_CMD(GET_SUPPORTED_LOGS, 0, CXL_VARIABLE_PAYLOAD, CXL_CMD_FLAG_FORCE_ENABLE), CXL_CMD(GET_EVENT_RECORD, 1, CXL_VARIABLE_PAYLOAD, 0), + CXL_CMD(CLEAR_EVENT_RECORD, CXL_VARIABLE_PAYLOAD, 0, 0), CXL_CMD(GET_FW_INFO, 0, 0x50, 0), CXL_CMD(GET_PARTITION_INFO, 0, 0x20, 0), CXL_CMD(GET_LSA, 0x8, CXL_VARIABLE_PAYLOAD, 0), @@ -708,6 +709,26 @@ int cxl_enumerate_cmds(struct cxl_dev_state *cxlds) } EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, CXL); +static int cxl_clear_event_record(struct cxl_dev_state *cxlds, + enum cxl_event_log_type log, + __le16 handle) +{ + struct cxl_mbox_clear_event_payload payload; + int rc; + + memset(&payload, 0, sizeof(payload)); + payload.event_log = log; + payload.nr_recs = 1; + payload.handle = handle; + + rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_CLEAR_EVENT_RECORD, + &payload, sizeof(payload), NULL, 0); + if (rc) + return rc; + + return 0; +} + static int cxl_mem_get_records_log(struct cxl_dev_state *cxlds, enum cxl_event_log_type type) { @@ -725,9 +746,12 @@ static int cxl_mem_get_records_log(struct cxl_dev_state *cxlds, return rc; record_count = le16_to_cpu(payload.record_count); - if (record_count > 0) + if (record_count > 0) { trace_cxl_event(dev_name(cxlds->dev), type, &payload.record); + cxl_clear_event_record(cxlds, type, + payload.record.hdr.handle); + } if (payload.flags & CXL_GET_EVENT_FLAG_OVERFLOW) trace_cxl_event_overflow(dev_name(cxlds->dev), type, @@ -742,10 +766,11 @@ static int cxl_mem_get_records_log(struct cxl_dev_state *cxlds, * cxl_mem_get_event_records - Get Event Records from the device * @cxlds: The device data for the operation * - * Retrieve all event records available on the device and report them as trace - * events. + * Retrieve all event records available on the device, report them as trace + * events, and clear them. * * See CXL v3.0 @8.2.9.2.2 Get Event Records + * See CXL v3.0 @8.2.9.2.3 Clear Event Records */ void cxl_mem_get_event_records(struct cxl_dev_state *cxlds) { diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index f83634f3bc8d..5506e7210cf6 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -255,6 +255,7 @@ enum cxl_opcode { CXL_MBOX_OP_INVALID = 0x0000, CXL_MBOX_OP_RAW = CXL_MBOX_OP_INVALID, CXL_MBOX_OP_GET_EVENT_RECORD = 0x0100, + CXL_MBOX_OP_CLEAR_EVENT_RECORD = 0x0101, CXL_MBOX_OP_GET_FW_INFO = 0x0200, CXL_MBOX_OP_ACTIVATE_FW = 0x0202, CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400, @@ -387,6 +388,20 @@ static inline char *cxl_event_log_type_str(enum cxl_event_log_type type) return "<unknown>"; } +/* + * Clear Event Records input payload + * CXL v3.0 section 8.2.9.2.3; Table 8-51 + * + * Space given for 1 record + */ +struct cxl_mbox_clear_event_payload { + u8 event_log; /* enum cxl_event_log_type */ + u8 clear_flags; + u8 nr_recs; /* 1 for this struct */ + u8 reserved[3]; + __le16 handle; +}; + struct cxl_mbox_get_partition_info { __le64 active_volatile_cap; __le64 active_persistent_cap; diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h index 70459be5bdd4..7c1ad8062792 100644 --- a/include/uapi/linux/cxl_mem.h +++ b/include/uapi/linux/cxl_mem.h @@ -25,6 +25,7 @@ ___C(RAW, "Raw device command"), \ ___C(GET_SUPPORTED_LOGS, "Get Supported Logs"), \ ___C(GET_EVENT_RECORD, "Get Event Record"), \ + ___C(CLEAR_EVENT_RECORD, "Clear Event Record"), \ ___C(GET_FW_INFO, "Get FW Info"), \ ___C(GET_PARTITION_INFO, "Get Partition Information"), \ ___C(GET_LSA, "Get Label Storage Area"), \ -- 2.35.3
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