Re: [PATCH] drm/radeon: fix check order in radeon_bo_move

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Ping, Dave this is another fix for the Multihop patch set.

Without it radeon is completely broken on drm-misc-next.

Thanks,
Christian.

Am 25.11.20 um 15:34 schrieb Christian König:
Reorder the code to fix checking if blitting is available.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
  drivers/gpu/drm/radeon/radeon_ttm.c | 54 +++++++++++++----------------
  1 file changed, 24 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 0ca381b95d3d..2b598141225f 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -216,27 +216,15 @@ static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict,
  	struct ttm_resource *old_mem = &bo->mem;
  	int r;
- if ((old_mem->mem_type == TTM_PL_SYSTEM &&
-	     new_mem->mem_type == TTM_PL_VRAM) ||
-	    (old_mem->mem_type == TTM_PL_VRAM &&
-	     new_mem->mem_type == TTM_PL_SYSTEM)) {
-		hop->fpfn = 0;
-		hop->lpfn = 0;
-		hop->mem_type = TTM_PL_TT;
-		hop->flags = 0;
-		return -EMULTIHOP;
-	}
-
  	if (new_mem->mem_type == TTM_PL_TT) {
  		r = radeon_ttm_tt_bind(bo->bdev, bo->ttm, new_mem);
  		if (r)
  			return r;
  	}
-	radeon_bo_move_notify(bo, evict, new_mem);
r = ttm_bo_wait_ctx(bo, ctx);
  	if (r)
-		goto fail;
+		return r;
/* Can't move a pinned BO */
  	rbo = container_of(bo, struct radeon_bo, tbo);
@@ -246,12 +234,12 @@ static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict,
  	rdev = radeon_get_rdev(bo->bdev);
  	if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
  		ttm_bo_move_null(bo, new_mem);
-		return 0;
+		goto out;
  	}
  	if (old_mem->mem_type == TTM_PL_SYSTEM &&
  	    new_mem->mem_type == TTM_PL_TT) {
  		ttm_bo_move_null(bo, new_mem);
-		return 0;
+		goto out;
  	}
if (old_mem->mem_type == TTM_PL_TT &&
@@ -259,31 +247,37 @@ static int radeon_bo_move(struct ttm_buffer_object *bo, bool evict,
  		radeon_ttm_tt_unbind(bo->bdev, bo->ttm);
  		ttm_resource_free(bo, &bo->mem);
  		ttm_bo_assign_mem(bo, new_mem);
-		return 0;
+		goto out;
  	}
-	if (!rdev->ring[radeon_copy_ring_index(rdev)].ready ||
-	    rdev->asic->copy.copy == NULL) {
-		/* use memcpy */
-		goto memcpy;
+	if (rdev->ring[radeon_copy_ring_index(rdev)].ready &&
+	    rdev->asic->copy.copy != NULL) {
+		if ((old_mem->mem_type == TTM_PL_SYSTEM &&
+		     new_mem->mem_type == TTM_PL_VRAM) ||
+		    (old_mem->mem_type == TTM_PL_VRAM &&
+		     new_mem->mem_type == TTM_PL_SYSTEM)) {
+			hop->fpfn = 0;
+			hop->lpfn = 0;
+			hop->mem_type = TTM_PL_TT;
+			hop->flags = 0;
+			return -EMULTIHOP;
+		}
+
+		r = radeon_move_blit(bo, evict, new_mem, old_mem);
+	} else {
+		r = -ENODEV;
  	}
- r = radeon_move_blit(bo, evict, new_mem, old_mem);
  	if (r) {
-memcpy:
  		r = ttm_bo_move_memcpy(bo, ctx, new_mem);
-		if (r) {
-			goto fail;
-		}
+		if (r)
+			return r;
  	}
+out:
  	/* update statistics */
  	atomic64_add((u64)bo->num_pages << PAGE_SHIFT, &rdev->num_bytes_moved);
+	radeon_bo_move_notify(bo, evict, new_mem);
  	return 0;
-fail:
-	swap(*new_mem, bo->mem);
-	radeon_bo_move_notify(bo, false, new_mem);
-	swap(*new_mem, bo->mem);
-	return r;
  }
static int radeon_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_resource *mem)

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