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Date: Wed, 24 Aug 2022 16:55:13 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: <ira.weiny@...el.com>
CC: Dan Williams <dan.j.williams@...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>,
Davidlohr Bueso <dave@...olabs.net>,
<linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [RFC PATCH 2/9] cxl/mem: Implement Clear Event Records command
On Fri, 12 Aug 2022 22:32:36 -0700
ira.weiny@...el.com wrote:
> 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>
Trivial suggestions inline, but other than that LGTM
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.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));
Could just do payload = {};
Thouch as you are setting stuff, why not just do
payload = {
.event_log = log,
.nr_recs = 1,
.handle = handle,
};
and let the compiler zero anything else (I think there are no holes to complicate
things).
> + 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);
return cxl_mbox_send_cmd() and drop rc definition.
> + 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"), \
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