[Intel-gfx] [PATCH] drm/i915: Make debugfs/i915_gem_request more friendly

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Count the number of requests in a ring for the user and show who
> submitted them.
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>

> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 39 ++++++++++++++++++++++++-------------
>  1 file changed, 26 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 9edc3f692256..6ff12ca147aa 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -671,31 +671,44 @@ static int i915_gem_request_info(struct seq_file *m, void *data)
>  	struct drm_device *dev = node->minor->dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_engine_cs *ring;
> -	struct drm_i915_gem_request *gem_request;
> -	int ret, count, i;
> +	struct drm_i915_gem_request *rq;
> +	int ret, any, i;
>  
>  	ret = mutex_lock_interruptible(&dev->struct_mutex);
>  	if (ret)
>  		return ret;
>  
> -	count = 0;
> +	any = 0;
>  	for_each_ring(ring, dev_priv, i) {
> -		if (list_empty(&ring->request_list))
> +		int count;
> +
> +		count = 0;
> +		list_for_each_entry(rq, &ring->request_list, list)
> +			count++;
> +		if (count == 0)
>  			continue;
>  
> -		seq_printf(m, "%s requests:\n", ring->name);
> -		list_for_each_entry(gem_request,
> -				    &ring->request_list,
> -				    list) {
> -			seq_printf(m, "    %x @ %d\n",
> -				   gem_request->seqno,
> -				   (int) (jiffies - gem_request->emitted_jiffies));
> +		seq_printf(m, "%s requests: %d\n", ring->name, count);
> +		list_for_each_entry(rq, &ring->request_list, list) {
> +			struct task_struct *task;
> +
> +			rcu_read_lock();
> +			task = NULL;
> +			if (rq->pid)
> +				task = pid_task(rq->pid, PIDTYPE_PID);
> +			seq_printf(m, "    %x @ %d: %s [%d]\n",
> +				   rq->seqno,
> +				   (int) (jiffies - rq->emitted_jiffies),
> +				   task ? task->comm : "<unknown>",
> +				   task ? task->pid : -1);
> +			rcu_read_unlock();
>  		}
> -		count++;
> +
> +		any++;
>  	}
>  	mutex_unlock(&dev->struct_mutex);
>  
> -	if (count == 0)
> +	if (any == 0)
>  		seq_puts(m, "No requests\n");
>  
>  	return 0;
> -- 
> 2.1.4
>
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