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Commit 224ee02a authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

drm/ttm: immediately move BOs to the new LRU v3 



Move BOs which are currently in a lower domain to the new
LRU before allocating backing space while validating.

This makes sure that we always have enough entries on the
LRU to allow for other processes to wait for an operation
to complete.

v2: generalize the test
v3: fix rebase error

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarChunming Zhou <david1.zhou@amd.com>
Tested-by: default avatarPierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 4c5ac948

drivers/gpu/drm/ttm/ttm_bo.c

+32 −10
Original line number Diff line number Diff line
@@ -166,7 +166,8 @@ static void ttm_bo_release_list(struct kref *list_kref) 
	ttm_mem_global_free(bdev->glob->mem_glob, acc_size);

}



void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)

static void ttm_bo_add_mem_to_lru(struct ttm_buffer_object *bo,

				  struct ttm_mem_reg *mem)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_mem_type_manager *man;
@@ -176,10 +177,10 @@ void ttm_bo_add_to_lru(struct ttm_buffer_object *bo) 
	if (!list_empty(&bo->lru))

		return;



	if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT)

	if (mem->placement & TTM_PL_FLAG_NO_EVICT)

		return;



	man = &bdev->man[bo->mem.mem_type];

	man = &bdev->man[mem->mem_type];

	list_add_tail(&bo->lru, &man->lru[bo->priority]);

	kref_get(&bo->list_kref);
@@ -189,6 +190,11 @@ void ttm_bo_add_to_lru(struct ttm_buffer_object *bo) 
		kref_get(&bo->list_kref);

	}

}



void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)

{

	ttm_bo_add_mem_to_lru(bo, &bo->mem);

}

EXPORT_SYMBOL(ttm_bo_add_to_lru);



static void ttm_bo_ref_bug(struct kref *list_kref)
@@ -1001,6 +1007,14 @@ static int ttm_bo_mem_placement(struct ttm_buffer_object *bo, 


	mem->mem_type = mem_type;

	mem->placement = cur_flags;



	if (bo->mem.mem_type < mem_type && !list_empty(&bo->lru)) {

		spin_lock(&bo->bdev->glob->lru_lock);

		ttm_bo_del_from_lru(bo);

		ttm_bo_add_mem_to_lru(bo, mem);

		spin_unlock(&bo->bdev->glob->lru_lock);

	}



	return 0;

}
@@ -1034,7 +1048,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (ret == -EBUSY)

			continue;

		if (ret)

			return ret;

			goto error;



		type_found = true;

		mem->mm_node = NULL;
@@ -1044,13 +1058,13 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		man = &bdev->man[mem->mem_type];

		ret = (*man->func->get_node)(man, bo, place, mem);

		if (unlikely(ret))

			return ret;

			goto error;



		if (mem->mm_node) {

			ret = ttm_bo_add_move_fence(bo, man, mem);

			if (unlikely(ret)) {

				(*man->func->put_node)(man, mem);

				return ret;

				goto error;

			}

			return 0;

		}
@@ -1063,7 +1077,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
		if (ret == -EBUSY)

			continue;

		if (ret)

			return ret;

			goto error;



		type_found = true;

		mem->mm_node = NULL;
@@ -1075,15 +1089,23 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo, 
			return 0;



		if (ret && ret != -EBUSY)

			return ret;

			goto error;

	}



	ret = -ENOMEM;

	if (!type_found) {

		pr_err(TTM_PFX "No compatible memory type found\n");

		return -EINVAL;

		ret = -EINVAL;

	}



	return -ENOMEM;

error:

	if (bo->mem.mem_type == TTM_PL_SYSTEM && !list_empty(&bo->lru)) {

		spin_lock(&bo->bdev->glob->lru_lock);

		ttm_bo_move_to_lru_tail(bo, NULL);

		spin_unlock(&bo->bdev->glob->lru_lock);

	}



	return ret;

}

EXPORT_SYMBOL(ttm_bo_mem_space);