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drm/ttm: add ttm_bo_pipeline_gutting

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Allows us to gut a BO of it's backing store when the driver says that it
isn't needed any more.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-02-20 15:35:21 +01:00 committed by Alex Deucher
parent 48527e5296
commit 5d95109815
3 changed files with 45 additions and 3 deletions
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15
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -622,14 +622,23 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
reservation_object_assert_held(bo->resv);
placement.num_placement = 0;
placement.num_busy_placement = 0;
bdev->driver->evict_flags(bo, &placement);
if (!placement.num_placement && !placement.num_busy_placement) {
ret = ttm_bo_pipeline_gutting(bo);
if (ret)
return ret;
return ttm_tt_create(bo, false);
}
evict_mem = bo->mem;
evict_mem.mm_node = NULL;
evict_mem.bus.io_reserved_vm = false;
evict_mem.bus.io_reserved_count = 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, ctx);
if (ret) {
if (ret != -ERESTARTSYS) {

24
drivers/gpu/drm/ttm/ttm_bo_util.c
View File

@ -801,3 +801,27 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
return 0;
}
EXPORT_SYMBOL(ttm_bo_pipeline_move);
int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
{
struct ttm_buffer_object *ghost;
int ret;
ret = ttm_buffer_object_transfer(bo, &ghost);
if (ret)
return ret;
ret = reservation_object_copy_fences(ghost->resv, bo->resv);
/* Last resort, wait for the BO to be idle when we are OOM */
if (ret)
ttm_bo_wait(bo, false, false);
memset(&bo->mem, 0, sizeof(bo->mem));
bo->mem.mem_type = TTM_PL_SYSTEM;
bo->ttm = NULL;
ttm_bo_unreserve(ghost);
ttm_bo_unref(&ghost);
return 0;
}

9
include/drm/ttm/ttm_bo_driver.h
View File

@ -849,6 +849,15 @@ int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
struct dma_fence *fence, bool evict,
struct ttm_mem_reg *new_mem);
/**
* ttm_bo_pipeline_gutting.
*
* @bo: A pointer to a struct ttm_buffer_object.
*
* Pipelined gutting a BO of it's backing store.
*/
int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
/**
* ttm_io_prot
*