[PATCH 5/9] drm/i915: Enable i915 perf stream for Haswell OA unit

[Chris Wilson]

On Wed, Apr 20, 2016 at 03:23:10PM +0100, Robert Bragg wrote:
> +static int alloc_oa_buffer(struct drm_i915_private *dev_priv)
> +{
> +	struct drm_i915_gem_object *bo;
> +	int ret;
> +
> +	BUG_ON(dev_priv->perf.oa.oa_buffer.obj);
> +
> +	ret = i915_mutex_lock_interruptible(dev_priv->dev);
> +	if (ret)
> +		return ret;
> +
> +	bo = i915_gem_alloc_object(dev_priv->dev, OA_BUFFER_SIZE);
> +	if (bo == NULL) {
> +		DRM_ERROR("Failed to allocate OA buffer\n");
> +		ret = -ENOMEM;
> +		goto unlock;
> +	}
> +	dev_priv->perf.oa.oa_buffer.obj = bo;
> +
> +	ret = i915_gem_object_set_cache_level(bo, I915_CACHE_LLC);
> +	if (ret)
> +		goto err_unref;
> +
> +	/* PreHSW required 512K alignment, HSW requires 16M */
> +	ret = i915_gem_obj_ggtt_pin(bo, SZ_16M, 0);
> +	if (ret)
> +		goto err_unref;
> +
> +	dev_priv->perf.oa.oa_buffer.gtt_offset = i915_gem_obj_ggtt_offset(bo);
> +	dev_priv->perf.oa.oa_buffer.addr = vmap_oa_buffer(bo);

Now i915_gem_object_pin_map(bo) instead of manually vmapping it, and
i915_gem_object_unpin_map() to release.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre