linux-kernel - Re: [PATCH 11/11] cxl/test: Simulate event log overflow

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Date:   Wed, 16 Nov 2022 16:10:08 +0000
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: [PATCH 11/11] cxl/test: Simulate event log overflow

On Thu, 10 Nov 2022 10:57:58 -0800
ira.weiny@...el.com wrote:

> From: Ira Weiny <ira.weiny@...el.com>
> 
> 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.
> 
> Signed-off-by: Ira Weiny <ira.weiny@...el.com>
Looks fine to me

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> ---
> Changes from RFC
> 	Adjust for new struct changes
> ---
>  tools/testing/cxl/test/events.c | 37 +++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/tools/testing/cxl/test/events.c b/tools/testing/cxl/test/events.c
> index 8693f3fb9cbb..5ce257114f4e 100644
> --- a/tools/testing/cxl/test/events.c
> +++ b/tools/testing/cxl/test/events.c
> @@ -69,11 +69,21 @@ static void event_store_add_event(struct mock_event_store *mes,
>  	log->nr_events++;
>  }
>  
> +static u16 log_overflow(struct mock_event_log *log)
> +{
> +	int cnt = log_rec_left(log) - 5;
> +
> +	if (cnt < 0)
> +		return 0;
> +	return cnt;
> +}
> +
>  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;
>  	u8 log_type;
> +	u16 nr_overflow;
>  
>  	/* Valid request? */
>  	if (cmd->size_in != sizeof(log_type))
> @@ -95,6 +105,20 @@ int mock_get_event(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd)
>  	if (log_rec_left(log) > 1)
>  		pl->flags |= CXL_GET_EVENT_FLAG_MORE_RECORDS;
>  
> +	nr_overflow = log_overflow(log);
> +	if (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);
> +	}
> +
>  	memcpy(&pl->record[0], get_cur_event(log), sizeof(pl->record[0]));
>  	pl->record[0].hdr.handle = get_cur_event_handle(log);
>  	return 0;
> @@ -274,6 +298,19 @@ 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);
> +	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);