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drm/ttm: Fix multihop assert on eviction.

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Problem:
Under memory pressure when GTT domain is almost full multihop assert
will come up when trying to evict LRU BO from VRAM to SYSTEM.

Fix:
Don't assert on multihop error in evict code but rather do a retry
as we do in ttm_bo_move_buffer

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210622162339.761651-6-andrey.grodzovsky@amd.com
This commit is contained in:
Andrey Grodzovsky 2021-06-22 12:23:39 -04:00
parent 91e99e1139
commit 4037979257
1 changed files with 34 additions and 29 deletions
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61
drivers/gpu/drm/ttm/ttm_bo.c
View file

@ -485,6 +485,31 @@ void ttm_bo_unlock_delayed_workqueue(struct ttm_device *bdev, int resched)
}
EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);
static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
struct ttm_resource **mem,
struct ttm_operation_ctx *ctx,
struct ttm_place *hop)
{
struct ttm_placement hop_placement;
struct ttm_resource *hop_mem;
int ret;
hop_placement.num_placement = hop_placement.num_busy_placement = 1;
hop_placement.placement = hop_placement.busy_placement = hop;
/* find space in the bounce domain */
ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
if (ret)
return ret;
/* move to the bounce domain */
ret = ttm_bo_handle_move_mem(bo, hop_mem, false, ctx, NULL);
if (ret) {
ttm_resource_free(bo, &hop_mem);
return ret;
}
return 0;
}
static int ttm_bo_evict(struct ttm_buffer_object *bo,
struct ttm_operation_ctx *ctx)
{
@ -524,12 +549,17 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
goto out;
}
bounce:
ret = ttm_bo_handle_move_mem(bo, evict_mem, true, ctx, &hop);
if (unlikely(ret)) {
WARN(ret == -EMULTIHOP, "Unexpected multihop in eviction - likely driver bug\n");
if (ret != -ERESTARTSYS)
if (ret == -EMULTIHOP) {
ret = ttm_bo_bounce_temp_buffer(bo, &evict_mem, ctx, &hop);
if (ret) {
pr_err("Buffer eviction failed\n");
ttm_resource_free(bo, &evict_mem);
goto out;
}
/* try and move to final place now. */
goto bounce;
}
out:
return ret;
@ -844,31 +874,6 @@ error:
}
EXPORT_SYMBOL(ttm_bo_mem_space);
static int ttm_bo_bounce_temp_buffer(struct ttm_buffer_object *bo,
struct ttm_resource **mem,
struct ttm_operation_ctx *ctx,
struct ttm_place *hop)
{
struct ttm_placement hop_placement;
struct ttm_resource *hop_mem;
int ret;
hop_placement.num_placement = hop_placement.num_busy_placement = 1;
hop_placement.placement = hop_placement.busy_placement = hop;
/* find space in the bounce domain */
ret = ttm_bo_mem_space(bo, &hop_placement, &hop_mem, ctx);
if (ret)
return ret;
/* move to the bounce domain */
ret = ttm_bo_handle_move_mem(bo, hop_mem, false, ctx, NULL);
if (ret) {
ttm_resource_free(bo, &hop_mem);
return ret;
}
return 0;
}
static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
struct ttm_placement *placement,
struct ttm_operation_ctx *ctx)