Re: [PATCH v3] drm/i915/debugfs: Show context objects in i915_gem_objects

[Joonas Lahtinen <joonas.lahtinen@linux.intel.com>]

On ma, 2016-05-23 at 14:01 +0100, Chris Wilson wrote:
> One of the uses for i915_gem_objects is pin-pointing leaks. For this, we
> can compare the number of allocated objects and who owns them, a
> discrepancy here often indicates a kernel bug. One allocator of unreported
> objects is for backing context objects, so include those in the listing.
> 
> v2: Take filelist_mutex which requires a little dance with struct_mutex
> to avoid nesting filelist_mutex inside struct_mutex.
> 

What's new in v3?

> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 38 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 30cb26fe2fa9..1300bad67f5c 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -417,6 +417,42 @@ static void print_batch_pool_stats(struct seq_file *m,
>  	print_file_stats(m, "[k]batch pool", stats);
>  }
>  
> +static int per_file_ctx_stats(int id, void *ptr, void *data)
> +{
> +	struct i915_gem_context *ctx = ptr;
> +	int n;
> +
> +	for (n = 0; n < ARRAY_SIZE(ctx->engine); n++) {
> +		if (ctx->engine[n].state)
> +			per_file_stats(0, ctx->engine[n].state, data);
> +		if (ctx->engine[n].ringbuf)
> +			per_file_stats(0, ctx->engine[n].ringbuf->obj, data);
> +	}
> +
> +	return 0;
> +}
> +
> +static void print_context_stats(struct seq_file *m,
> +				struct drm_i915_private *dev_priv)
> +{
> +	struct file_stats stats;
> +	struct drm_file *file;
> +
> +	memset(&stats, 0, sizeof(stats));
> +
> +	mutex_lock(&dev_priv->dev->struct_mutex);
> +	if (dev_priv->kernel_context)
> +		per_file_ctx_stats(0, dev_priv->kernel_context, &stats);
> +
> +	list_for_each_entry(file, &dev_priv->dev->filelist, lhead) {
> +		struct drm_i915_file_private *fpriv = file->driver_priv;
> +		idr_for_each(&fpriv->context_idr, per_file_ctx_stats, &stats);
> +	}
> +	mutex_unlock(&dev_priv->dev->struct_mutex);
> +
> +	print_file_stats(m, "[k]contexts", stats);
> +}
> +
>  #define count_vmas(list, member) do { \
>  	list_for_each_entry(vma, list, member) { \
>  		size += i915_gem_obj_total_ggtt_size(vma->obj); \
> @@ -521,10 +557,10 @@ static int i915_gem_object_info(struct seq_file *m, void* data)
>  
>  	seq_putc(m, '\n');
>  	print_batch_pool_stats(m, dev_priv);
> -
>  	mutex_unlock(&dev->struct_mutex);
>  
>  	mutex_lock(&dev->filelist_mutex);
> +	print_context_stats(m, dev_priv);
>  	list_for_each_entry_reverse(file, &dev->filelist, lhead) {
>  		struct file_stats stats;
>  		struct task_struct *task;
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
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