예제 #1
0
static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,
			bool no_wait_reserve, bool no_wait_gpu)
{
	struct ttm_bo_device *bdev = bo->bdev;
	struct ttm_mem_reg evict_mem;
	struct ttm_placement placement;
	int ret = 0;

	spin_lock(&bdev->fence_lock);
	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
	spin_unlock(&bdev->fence_lock);

	if (unlikely(ret != 0)) {
		if (ret != -ERESTARTSYS) {
			printk(KERN_ERR TTM_PFX
			       "Failed to expire sync object before "
			       "buffer eviction.\n");
		}
		goto out;
	}

	BUG_ON(!atomic_read(&bo->reserved));

	evict_mem = bo->mem;
	evict_mem.mm_node = NULL;
	evict_mem.bus.io_reserved_vm = false;
	evict_mem.bus.io_reserved_count = 0;

	placement.fpfn = 0;
	placement.lpfn = 0;
	placement.num_placement = 0;
	placement.num_busy_placement = 0;
	bdev->driver->evict_flags(bo, &placement);
	ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,
				no_wait_reserve, no_wait_gpu);
	if (ret) {
		if (ret != -ERESTARTSYS) {
			printk(KERN_ERR TTM_PFX
			       "Failed to find memory space for "
			       "buffer 0x%p eviction.\n", bo);
			ttm_bo_mem_space_debug(bo, &placement);
		}
		goto out;
	}

	ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,
				     no_wait_reserve, no_wait_gpu);
	if (ret) {
		if (ret != -ERESTARTSYS)
			printk(KERN_ERR TTM_PFX "Buffer eviction failed\n");
		ttm_bo_mem_put(bo, &evict_mem);
		goto out;
	}
	bo->evicted = true;
out:
	return ret;
}
예제 #2
0
파일: ttm_bo.c 프로젝트: kvaneesh/linux-kvm
int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
			struct ttm_placement *placement,
			bool interruptible, bool no_wait_reserve,
			bool no_wait_gpu)
{
	struct ttm_bo_global *glob = bo->glob;
	int ret = 0;
	struct ttm_mem_reg mem;

	BUG_ON(!atomic_read(&bo->reserved));

	/*
	 * FIXME: It's possible to pipeline buffer moves.
	 * Have the driver move function wait for idle when necessary,
	 * instead of doing it here.
	 */
	spin_lock(&bo->lock);
	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);
	spin_unlock(&bo->lock);
	if (ret)
		return ret;
	mem.num_pages = bo->num_pages;
	mem.size = mem.num_pages << PAGE_SHIFT;
	mem.page_alignment = bo->mem.page_alignment;
	mem.bus.io_reserved = false;
	/*
	 * Determine where to move the buffer.
	 */
	ret = ttm_bo_mem_space(bo, placement, &mem, interruptible, no_wait_reserve, no_wait_gpu);
	if (ret)
		goto out_unlock;
	ret = ttm_bo_handle_move_mem(bo, &mem, false, interruptible, no_wait_reserve, no_wait_gpu);
out_unlock:
	if (ret && mem.mm_node) {
		spin_lock(&glob->lru_lock);
		drm_mm_put_block(mem.mm_node);
		spin_unlock(&glob->lru_lock);
	}
	return ret;
}
예제 #3
0
static int ttm_bo_swapout(struct ttm_mem_shrink *shrink)
{
	struct ttm_bo_global *glob =
	    container_of(shrink, struct ttm_bo_global, shrink);
	struct ttm_buffer_object *bo;
	int ret = -EBUSY;
	int put_count;
	uint32_t swap_placement = (TTM_PL_FLAG_CACHED | TTM_PL_FLAG_SYSTEM);

	spin_lock(&glob->lru_lock);
	while (ret == -EBUSY) {
		if (unlikely(list_empty(&glob->swap_lru))) {
			spin_unlock(&glob->lru_lock);
			return -EBUSY;
		}

		bo = list_first_entry(&glob->swap_lru,
				      struct ttm_buffer_object, swap);
		kref_get(&bo->list_kref);

		if (!list_empty(&bo->ddestroy)) {
			spin_unlock(&glob->lru_lock);
			(void) ttm_bo_cleanup_refs(bo, false, false, false);
			kref_put(&bo->list_kref, ttm_bo_release_list);
			continue;
		}

		/**
		 * Reserve buffer. Since we unlock while sleeping, we need
		 * to re-check that nobody removed us from the swap-list while
		 * we slept.
		 */

		ret = ttm_bo_reserve_locked(bo, false, true, false, 0);
		if (unlikely(ret == -EBUSY)) {
			spin_unlock(&glob->lru_lock);
			ttm_bo_wait_unreserved(bo, false);
			kref_put(&bo->list_kref, ttm_bo_release_list);
			spin_lock(&glob->lru_lock);
		}
	}

	BUG_ON(ret != 0);
	put_count = ttm_bo_del_from_lru(bo);
	spin_unlock(&glob->lru_lock);

	ttm_bo_list_ref_sub(bo, put_count, true);

	/**
	 * Wait for GPU, then move to system cached.
	 */

	spin_lock(&bo->bdev->fence_lock);
	ret = ttm_bo_wait(bo, false, false, false);
	spin_unlock(&bo->bdev->fence_lock);

	if (unlikely(ret != 0))
		goto out;

	if ((bo->mem.placement & swap_placement) != swap_placement) {
		struct ttm_mem_reg evict_mem;

		evict_mem = bo->mem;
		evict_mem.mm_node = NULL;
		evict_mem.placement = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED;
		evict_mem.mem_type = TTM_PL_SYSTEM;

		ret = ttm_bo_handle_move_mem(bo, &evict_mem, true,
					     false, false, false);
		if (unlikely(ret != 0))
			goto out;
	}

	ttm_bo_unmap_virtual(bo);

	/**
	 * Swap out. Buffer will be swapped in again as soon as
	 * anyone tries to access a ttm page.
	 */

	if (bo->bdev->driver->swap_notify)
		bo->bdev->driver->swap_notify(bo);

	ret = ttm_tt_swapout(bo->ttm, bo->persistent_swap_storage);
out:

	/**
	 *
	 * Unreserve without putting on LRU to avoid swapping out an
	 * already swapped buffer.
	 */

	atomic_set(&bo->reserved, 0);
	wake_up_all(&bo->event_queue);
	kref_put(&bo->list_kref, ttm_bo_release_list);
	return ret;
}