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Message-Id: <20220813053243.757363-3-ira.weiny@intel.com>
Date: Fri, 12 Aug 2022 22:32:36 -0700
From: ira.weiny@...el.com
To: Dan Williams <dan.j.williams@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Ben Widawsky <bwidawsk@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Davidlohr Bueso <dave@...olabs.net>,
linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: [RFC PATCH 2/9] cxl/mem: Implement Clear Event Records command
From: Ira Weiny <ira.weiny@...el.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@...el.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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