On Wed, Nov 11, 2015 at 04:06:13PM +0530, ankitprasad.r.sharma@xxxxxxxxx wrote:
> +swap_pages:
> + stolen_pages = obj->pages;
> + obj->pages = NULL;
> +
> + obj->base.filp = file;
> + obj->base.read_domains = I915_GEM_DOMAIN_CPU;
> + obj->base.write_domain = I915_GEM_DOMAIN_CPU;
> +
> + /* Recreate any pinned binding with pointers to the new storage */
> + if (!list_empty(&obj->vma_list)) {
> + ret = i915_gem_object_get_pages_gtt(obj);
> + if (ret) {
> + obj->pages = stolen_pages;
> + goto err_file;
> + }
> +
> + ret = i915_gem_gtt_prepare_object(obj);
> + if (ret) {
> + i915_gem_object_put_pages_gtt(obj);
> + obj->pages = stolen_pages;
> + goto err_file;
> + }
i915_gem_gtt_prepare_object() has been moved into
i915_gem_object_get_pages_gtt() so we can skip the call here.
> +
> + ret = i915_gem_object_set_to_gtt_domain(obj, true);
> + if (ret) {
> + i915_gem_gtt_finish_object(obj);
Ditto.
> +int
> +i915_gem_freeze(struct drm_device *dev)
> +{
> + /* Called before i915_gem_suspend() when hibernating */
> + struct drm_i915_private *i915 = to_i915(dev);
> + struct drm_i915_gem_object *obj, *tmp;
> + struct list_head *phase[] = {
> + &i915->mm.unbound_list, &i915->mm.bound_list, NULL
> + }, **p;
ret = i915_mutex_lock_interruptible(dev);
if (ret) return ret;
> +
> + /* Across hibernation, the stolen area is not preserved.
> + * Anything inside stolen must copied back to normal
> + * memory if we wish to preserve it.
> + */
> + for (p = phase; *p; p++) {
> + struct list_head migrate;
> + int ret;
> +
> + INIT_LIST_HEAD(&migrate);
> + list_for_each_entry_safe(obj, tmp, *p, global_list) {
> + if (obj->stolen == NULL)
> + continue;
> +
> + if (obj->internal_volatile)
> + continue;
> +
> + /* In the general case, this object may only be alive
> + * due to an active reference, and that may disappear
> + * when we unbind any of the objects (and so wait upon
> + * the GPU and retire requests). To prevent one of the
> + * objects from disappearing beneath us, we need to
> + * take a reference to each as we build the migration
> + * list.
> + *
> + * This is similar to the strategy required whilst
> + * shrinking or evicting objects (for the same reason).
> + */
> + drm_gem_object_reference(&obj->base);
> + list_move(&obj->global_list, &migrate);
> + }
> +
> + ret = 0;
> + list_for_each_entry_safe(obj, tmp, &migrate, global_list) {
> + if (ret == 0)
> + ret = i915_gem_object_migrate_stolen_to_shmemfs(obj);
> + drm_gem_object_unreference(&obj->base);
> + }
> + list_splice(&migrate, *p);
> + if (ret)
break;
> + }
mutex_unlock(&dev->struct_mutex;
> +
> + return 0;
return ret;
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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