Re: [PATCH 13/18] drm/i915: Augment i915 error state to include the dump of GuC log buffer

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 15/08/16 15:49, akash.goel@intel.com wrote:
> From: Akash Goel <akash.goel@intel.com>
>
> Added the dump of GuC log buffer to i915 error state, as the contents of
> GuC log buffer would also be useful to determine that why the GPU reset
> was triggered.
>
> v2:
> - For uniformity use existing helper function print_error_obj() to
>    dump out contents of GuC log buffer, pretty printing is better left
>    to userspace. (Chris)
> - Skip the dumping of GuC log buffer when logging is disabled as it
>    won't be of any use.
> - Rebase.
>
> Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Akash Goel <akash.goel@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_drv.h       |  1 +
>   drivers/gpu/drm/i915/i915_gpu_error.c | 20 ++++++++++++++++++++
>   2 files changed, 21 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 08553b9..de89596 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -734,6 +734,7 @@ struct drm_i915_error_state {
>   	struct intel_overlay_error_state *overlay;
>   	struct intel_display_error_state *display;
>   	struct drm_i915_error_object *semaphore;
> +	struct drm_i915_error_object *guc_log;
>
>   	struct drm_i915_error_engine {
>   		int engine_id;
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 0c3f30c..94297aa 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -572,6 +572,13 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
>   		}
>   	}
>
> +	obj = error->guc_log;
> +	if (obj) {
> +		err_printf(m, "GuC log buffer = 0x%08x\n",
> +			   lower_32_bits(obj->gtt_offset));
> +		print_error_obj(m, obj);
> +	}
> +
>   	if (error->overlay)
>   		intel_overlay_print_error_state(m, error->overlay);
>
> @@ -651,6 +658,7 @@ static void i915_error_state_free(struct kref *error_ref)
>   	}
>
>   	i915_error_object_free(error->semaphore);
> +	i915_error_object_free(error->guc_log);
>
>   	for (i = 0; i < ARRAY_SIZE(error->active_bo); i++)
>   		kfree(error->active_bo[i]);
> @@ -1286,6 +1294,17 @@ static void i915_capture_pinned_buffers(struct drm_i915_private *dev_priv,
>   	error->pinned_bo = bo;
>   }
>
> +static void i915_gem_capture_guc_log_buffer(struct drm_i915_private *dev_priv,
> +					    struct drm_i915_error_state *error)
> +{
> +	/* Capturing log buf contents won't be useful if logging was disabled */
> +	if (!dev_priv->guc.log.vma || (i915.guc_log_level < 0))
> +		return;
> +
> +	error->guc_log = i915_error_object_create(dev_priv,
> +						  dev_priv->guc.log.vma);
> +}
> +
>   /* Capture all registers which don't fit into another category. */
>   static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
>   				   struct drm_i915_error_state *error)
> @@ -1437,6 +1456,7 @@ void i915_capture_error_state(struct drm_i915_private *dev_priv,
>   	i915_gem_record_rings(dev_priv, error);
>   	i915_capture_active_buffers(dev_priv, error);
>   	i915_capture_pinned_buffers(dev_priv, error);
> +	i915_gem_capture_guc_log_buffer(dev_priv, error);
>
>   	do_gettimeofday(&error->time);
>
>

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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