[PATCH v3] drm/xe: Add process name to devcoredump

[Nirmoy Das]

On 5/22/2024 10:12 PM, José Roberto de Souza wrote:
> Process name help us track what application caused the gpug hang, this
> is crucial when running several applications at the same time.
>
> v2:
> - handle Xe KMD exec_queues without VM
>
> v3:
> - use get_pid_task() (suggested by Nirmoy)
>
> Cc: Rodrigo Vivi<rodrigo.vivi at intel.com>
> Cc: Nirmoy Das<nirmoy.das at intel.com>
> Signed-off-by: José Roberto de Souza<jose.souza at intel.com>
Reviewed-by : Nirmoy Das <nirmoy.das at intel.com>
> ---
>   drivers/gpu/drm/xe/xe_devcoredump.c       | 13 +++++++++++++
>   drivers/gpu/drm/xe/xe_devcoredump_types.h |  2 ++
>   2 files changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/xe/xe_devcoredump.c b/drivers/gpu/drm/xe/xe_devcoredump.c
> index e70aef7971930..1643d44f8bc42 100644
> --- a/drivers/gpu/drm/xe/xe_devcoredump.c
> +++ b/drivers/gpu/drm/xe/xe_devcoredump.c
> @@ -110,6 +110,7 @@ static ssize_t xe_devcoredump_read(char *buffer, loff_t offset,
>   	drm_printf(&p, "Snapshot time: %lld.%09ld\n", ts.tv_sec, ts.tv_nsec);
>   	ts = ktime_to_timespec64(ss->boot_time);
>   	drm_printf(&p, "Uptime: %lld.%09ld\n", ts.tv_sec, ts.tv_nsec);
> +	drm_printf(&p, "Process: %s\n", ss->process_name);
>   	xe_device_snapshot_print(xe, &p);
>   
>   	drm_printf(&p, "\n**** GuC CT ****\n");
> @@ -166,12 +167,24 @@ static void devcoredump_snapshot(struct xe_devcoredump *coredump,
>   	enum xe_hw_engine_id id;
>   	u32 adj_logical_mask = q->logical_mask;
>   	u32 width_mask = (0x1 << q->width) - 1;
> +	const char *process_name = "no process";
> +	struct task_struct *task = NULL;
> +
>   	int i;
>   	bool cookie;
>   
>   	ss->snapshot_time = ktime_get_real();
>   	ss->boot_time = ktime_get_boottime();
>   
> +	if (q->vm) {
> +		task = get_pid_task(q->vm->xef->drm->pid, PIDTYPE_PID);
> +		if (task)
> +			process_name = task->comm;
> +	}
> +	snprintf(ss->process_name, sizeof(ss->process_name), process_name);
> +	if (task)
> +		put_task_struct(task);
> +
>   	ss->gt = q->gt;
>   	INIT_WORK(&ss->work, xe_devcoredump_deferred_snap_work);
>   
> diff --git a/drivers/gpu/drm/xe/xe_devcoredump_types.h b/drivers/gpu/drm/xe/xe_devcoredump_types.h
> index 6f654b63c7f1c..923cdf72a816a 100644
> --- a/drivers/gpu/drm/xe/xe_devcoredump_types.h
> +++ b/drivers/gpu/drm/xe/xe_devcoredump_types.h
> @@ -26,6 +26,8 @@ struct xe_devcoredump_snapshot {
>   	ktime_t snapshot_time;
>   	/** @boot_time:  Relative boot time so the uptime can be calculated. */
>   	ktime_t boot_time;
> +	/** @process_name: Name of process that triggered this gpu hang */
> +	char process_name[TASK_COMM_LEN];
>   
>   	/** @gt: Affected GT, used by forcewake for delayed capture */
>   	struct xe_gt *gt;
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