linux-kernel - Re: [PATCH v7 8/8] cxl/test: Simulate event log overflow

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Message-ID: <7d35c9f2-9070-32d0-2ddc-ff6b0a8b5c26@intel.com>
Date:   Tue, 9 May 2023 15:31:43 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Davidlohr Bueso <dave@...olabs.net>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-cxl@...r.kernel.org
Subject: Re: [PATCH v7 8/8] cxl/test: Simulate event log overflow



On 1/17/23 10:53 PM, Ira Weiny wrote:
> Log overflow is marked by a separate trace message.
> 
> Simulate a log with lots of messages and flag overflow until space is
> cleared.
> 
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>

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

> 
> ---
> Changes in v7:
>          <no change>
> ---
>   tools/testing/cxl/test/mem.c | 50 +++++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 49 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/cxl/test/mem.c b/tools/testing/cxl/test/mem.c
> index 00bf19a68604..9263b04d35f7 100644
> --- a/tools/testing/cxl/test/mem.c
> +++ b/tools/testing/cxl/test/mem.c
> @@ -78,6 +78,8 @@ 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];
>   };
>   
> @@ -116,6 +118,7 @@ static void event_reset_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 */
> @@ -147,8 +150,12 @@ static void mes_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++;
> @@ -159,6 +166,7 @@ static int mock_get_event(struct cxl_dev_state *cxlds,
>   {
>   	struct cxl_get_event_payload *pl;
>   	struct mock_event_log *log;
> +	u16 nr_overflow;
>   	u8 log_type;
>   	int i;
>   
> @@ -191,6 +199,19 @@ static int mock_get_event(struct cxl_dev_state *cxlds,
>   	if (!event_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);
> +	}
> +
>   	return 0;
>   }
>   
> @@ -231,6 +252,9 @@ static int mock_clear_event(struct cxl_dev_state *cxlds,
>   		}
>   	}
>   
> +	if (log->nr_overflow)
> +		log->nr_overflow = 0;
> +
>   	/* Clear events */
>   	log->clear_idx += pl->nr_recs;
>   	return 0;
> @@ -353,6 +377,30 @@ static void cxl_mock_add_event_logs(struct mock_event_store *mes)
>   		      (struct cxl_event_record_raw *)&mem_module);
>   	mes->ev_status |= CXLDEV_EVENT_STATUS_INFO;
>   
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &maint_needed);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +		      (struct cxl_event_record_raw *)&dram);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +		      (struct cxl_event_record_raw *)&gen_media);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +		      (struct cxl_event_record_raw *)&mem_module);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL,
> +		      (struct cxl_event_record_raw *)&dram);
> +	/* Overflow this log */
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes_add_event(mes, CXL_EVENT_TYPE_FAIL, &hardware_replace);
> +	mes->ev_status |= CXLDEV_EVENT_STATUS_FAIL;
> +
>   	mes_add_event(mes, CXL_EVENT_TYPE_FATAL, &hardware_replace);
>   	mes_add_event(mes, CXL_EVENT_TYPE_FATAL,
>   		      (struct cxl_event_record_raw *)&dram);
>