Re: [PATCH v3 3/3] drm/i915: tidy up a few leftovers

[Nick Hoath <nicholas.hoath@intel.com>]

On 07/01/2016 10:20, Dave Gordon wrote:
> There are a few bits of code which the transformations implemented by
> the previous patch reveal to be suboptimal, once the notion of a per-
> ring default context has gone away. So this tidies up the leftovers.
>
> It could have been squashed into the previous patch, but that would have
> made that patch less clearly a simple transformation. In particular, any
> change which alters the code block structure or indentation has been
> deferred into this separate patch, because such things tend to make diffs
> more difficult to read.
>
> Signed-off-by: Dave Gordon <david.s.gordon@intel.com>

Reviewed-by: Nick Hoath <nicholas.hoath@intel.com>

> ---
>   drivers/gpu/drm/i915/i915_debugfs.c | 15 +++++----------
>   drivers/gpu/drm/i915/i915_gem.c     |  6 ++----
>   drivers/gpu/drm/i915/intel_lrc.c    | 38 +++++++++++++++++--------------------
>   3 files changed, 24 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 2613708..bbb23da 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1942,11 +1942,8 @@ static int i915_context_status(struct seq_file *m, void *unused)
>
>   		seq_puts(m, "HW context ");
>   		describe_ctx(m, ctx);
> -		for_each_ring(ring, dev_priv, i) {
> -			if (dev_priv->kernel_context == ctx)
> -				seq_printf(m, "(default context %s) ",
> -					   ring->name);
> -		}
> +		if (ctx == dev_priv->kernel_context)
> +			seq_printf(m, "(kernel context) ");
>
>   		if (i915.enable_execlists) {
>   			seq_putc(m, '\n');
> @@ -2037,13 +2034,11 @@ static int i915_dump_lrc(struct seq_file *m, void *unused)
>   	if (ret)
>   		return ret;
>
> -	list_for_each_entry(ctx, &dev_priv->context_list, link) {
> -		for_each_ring(ring, dev_priv, i) {
> -			if (dev_priv->kernel_context != ctx)
> +	list_for_each_entry(ctx, &dev_priv->context_list, link)
> +		if (ctx != dev_priv->kernel_context)
> +			for_each_ring(ring, dev_priv, i)
>   				i915_dump_lrc_obj(m, ring,
>   						  ctx->engine[i].state);
> -		}
> -	}
>
>   	mutex_unlock(&dev->struct_mutex);
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 8f101121..4f45eb2 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -2677,10 +2677,8 @@ void i915_gem_request_free(struct kref *req_ref)
>   		i915_gem_request_remove_from_client(req);
>
>   	if (ctx) {
> -		if (i915.enable_execlists) {
> -			if (ctx != req->i915->kernel_context)
> -				intel_lr_context_unpin(req);
> -		}
> +		if (i915.enable_execlists && ctx != req->i915->kernel_context)
> +			intel_lr_context_unpin(req);
>
>   		i915_gem_context_unreference(ctx);
>   	}
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index aaaa5a3..8c4c9b9 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -660,16 +660,10 @@ static int execlists_move_to_gpu(struct drm_i915_gem_request *req,
>
>   int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request)
>   {
> -	int ret;
> +	int ret = 0;
>
>   	request->ringbuf = request->ctx->engine[request->ring->id].ringbuf;
>
> -	if (request->ctx != request->i915->kernel_context) {
> -		ret = intel_lr_context_pin(request);
> -		if (ret)
> -			return ret;
> -	}
> -
>   	if (i915.enable_guc_submission) {
>   		/*
>   		 * Check that the GuC has space for the request before
> @@ -683,7 +677,10 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
>   			return ret;
>   	}
>
> -	return 0;
> +	if (request->ctx != request->i915->kernel_context)
> +		ret = intel_lr_context_pin(request);
> +
> +	return ret;
>   }
>
>   static int logical_ring_wait_for_space(struct drm_i915_gem_request *req,
> @@ -2382,22 +2379,21 @@ void intel_lr_context_free(struct intel_context *ctx)
>   {
>   	int i;
>
> -	for (i = 0; i < I915_NUM_RINGS; i++) {
> +	for (i = I915_NUM_RINGS; --i >= 0; ) {
> +		struct intel_ringbuffer *ringbuf = ctx->engine[i].ringbuf;
>   		struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state;
>
> -		if (ctx_obj) {
> -			struct intel_ringbuffer *ringbuf =
> -					ctx->engine[i].ringbuf;
> -			struct intel_engine_cs *ring = ringbuf->ring;
> +		if (!ctx_obj)
> +			continue;
>
> -			if (ctx == ctx->i915->kernel_context) {
> -				intel_unpin_ringbuffer_obj(ringbuf);
> -				i915_gem_object_ggtt_unpin(ctx_obj);
> -			}
> -			WARN_ON(ctx->engine[ring->id].pin_count);
> -			intel_ringbuffer_free(ringbuf);
> -			drm_gem_object_unreference(&ctx_obj->base);
> +		if (ctx == ctx->i915->kernel_context) {
> +			intel_unpin_ringbuffer_obj(ringbuf);
> +			i915_gem_object_ggtt_unpin(ctx_obj);
>   		}
> +
> +		WARN_ON(ctx->engine[i].pin_count);
> +		intel_ringbuffer_free(ringbuf);
> +		drm_gem_object_unreference(&ctx_obj->base);
>   	}
>   }
>
> @@ -2472,7 +2468,7 @@ static void lrc_setup_hardware_status_page(struct intel_engine_cs *ring,
>    */
>
>   int intel_lr_context_deferred_alloc(struct intel_context *ctx,
> -				     struct intel_engine_cs *ring)
> +				    struct intel_engine_cs *ring)
>   {
>   	struct drm_device *dev = ring->dev;
>   	struct drm_i915_gem_object *ctx_obj;
>

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