Re: [PATCH V2 11/11] cxl/test: Simulate event log overflow

[Dave Jiang]

On 11/30/2022 5:27 PM, ira.weiny@xxxxxxxxx wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> Log overflow is marked by a separate trace message.
>
> Simulate a log with lots of messages and flag overflow until it is
> drained a bit.
>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>

Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>

> ---
> Changes from RFC
> 	Adjust for new struct changes
> ---
>   tools/testing/cxl/test/events.c | 49 ++++++++++++++++++++++++++++++++-
>   1 file changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/cxl/test/events.c b/tools/testing/cxl/test/events.c
> index 0bcc485e07da..ceabefb526c2 100644
> --- a/tools/testing/cxl/test/events.c
> +++ b/tools/testing/cxl/test/events.c
> @@ -15,6 +15,8 @@ struct mock_event_log {
>   	u16 clear_idx;
>   	u16 cur_idx;
>   	u16 nr_events;
> +	u16 nr_overflow;
> +	u16 overflow_reset;
>   	struct cxl_event_record_raw *events[CXL_TEST_EVENT_CNT_MAX];
>   };
>   
> @@ -45,6 +47,7 @@ void reset_event_log(struct mock_event_log *log)
>   {
>   	log->cur_idx = 0;
>   	log->clear_idx = 0;
> +	log->nr_overflow = log->overflow_reset;
>   }
>   
>   /* Handle can never be 0 use 1 based indexing for handle */
> @@ -76,8 +79,12 @@ static void event_store_add_event(struct mock_event_store *mes,
>   		return;
>   
>   	log = &mes->mock_logs[log_type];
> -	if (WARN_ON(log->nr_events >= CXL_TEST_EVENT_CNT_MAX))
> +
> +	if ((log->nr_events + 1) > CXL_TEST_EVENT_CNT_MAX) {
> +		log->nr_overflow++;
> +		log->overflow_reset = log->nr_overflow;
>   		return;
> +	}
>   
>   	log->events[log->nr_events] = event;
>   	log->nr_events++;
> @@ -87,6 +94,7 @@ int mock_get_event(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
>   {
>   	struct cxl_get_event_payload *pl;
>   	struct mock_event_log *log;
> +	u16 nr_overflow;
>   	u8 log_type;
>   	int i;
>   
> @@ -118,6 +126,21 @@ int mock_get_event(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
>   	if (!log_empty(log))
>   		pl->flags |= CXL_GET_EVENT_FLAG_MORE_RECORDS;
>   
> +	if (log->nr_overflow) {
> +		u64 ns;
> +
> +		pl->flags |= CXL_GET_EVENT_FLAG_OVERFLOW;
> +		pl->overflow_err_count = cpu_to_le16(nr_overflow);
> +		ns = ktime_get_real_ns();
> +		ns -= 5000000000; /* 5s ago */
> +		pl->first_overflow_timestamp = cpu_to_le64(ns);
> +		ns = ktime_get_real_ns();
> +		ns -= 1000000000; /* 1s ago */
> +		pl->last_overflow_timestamp = cpu_to_le64(ns);
> +
> +		log->nr_overflow = 0;
> +	}
> +
>   	return 0;
>   }
>   EXPORT_SYMBOL_GPL(mock_get_event);
> @@ -297,6 +320,30 @@ u32 cxl_mock_add_event_logs(struct cxl_dev_state *cxlds)
>   			      (struct cxl_event_record_raw *)&mem_module);
>   	mes->ev_status |= CXLDEV_EVENT_STATUS_INFO;
>   
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &maint_needed);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +			      (struct cxl_event_record_raw *)&dram);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +			      (struct cxl_event_record_raw *)&gen_media);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +			      (struct cxl_event_record_raw *)&mem_module);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +			      (struct cxl_event_record_raw *)&dram);
> +	/* Overflow this log */
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	event_store_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes->ev_status |= CXLDEV_EVENT_STATUS_FAIL;
> +
>   	event_store_add_event(mes, CXL_EVENT_TYPE_FATAL, &hardware_replace);
>   	event_store_add_event(mes, CXL_EVENT_TYPE_FATAL,
>   			      (struct cxl_event_record_raw *)&dram);