Re: [PATCH 04/18] drm/i915: add context information to objects

[Daniel Vetter <daniel@ffwll.ch>]

On Sun, Mar 18, 2012 at 01:39:44PM -0700, Ben Widawsky wrote:
> Handy mostly for assertions.
> 
> Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

I don't see the point of carrying around a obj->context_id - context_id's
are file_priv, so they're not that useful in the tracepoint. I suggest you
just drop the contex_id arg there - the obj pointers are global and imo
good enough for identification. And the few BUG_ON's don't seem really
useful either.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_drv.h         |    5 +++++
>  drivers/gpu/drm/i915/i915_gem.c         |    1 +
>  drivers/gpu/drm/i915/i915_gem_context.c |    3 +++
>  3 files changed, 9 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index e49e2f7..f458a8f 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -953,6 +953,11 @@ struct drm_i915_gem_object {
>  	 * reaches 0, dev_priv->pending_flip_queue will be woken up.
>  	 */
>  	atomic_t pending_flip;
> +
> +	/**
> +	 * >= 0 if this object is the object for a context.
> +	 */
> +	int context_id;
>  };
>  
>  #define to_intel_bo(x) container_of(x, struct drm_i915_gem_object, base)
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 6343a82..0985aa5 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -3629,6 +3629,7 @@ struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
>  	obj->madv = I915_MADV_WILLNEED;
>  	/* Avoid an unnecessary call to unbind on the first bind. */
>  	obj->map_and_fenceable = true;
> +	obj->context_id = -1;
>  
>  	return obj;
>  }
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 2c9116d..321bafd 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -127,6 +127,7 @@ again:
>  	} else if (ret)
>  		goto err_out;
>  
> +	(*ctx_out)->obj->context_id = (*ctx_out)->id;
>  	return 0;
>  
>  err_out:
> @@ -171,6 +172,8 @@ static int create_default_context(struct drm_i915_private *dev_priv)
>  	 * default context.
>  	 */
>  	ctx = dev_priv->ring[RCS].default_context;
> +	ctx->id = DEFAULT_CONTEXT_ID;
> +	ctx->obj->context_id = DEFAULT_CONTEXT_ID;
>  	ret = i915_gem_object_pin(ctx->obj, CONTEXT_ALIGN, false);
>  	if (ret)
>  		do_destroy(ctx);
> -- 
> 1.7.9.4
> 
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-- 
Daniel Vetter
Mail: daniel@ffwll.ch
Mobile: +41 (0)79 365 57 48