drm/vmwgfx: Remove the dedicated memory accounting

vmwgfx shared very elaborate memory accounting with ttm. It was moved
from ttm to vmwgfx in change
f07069da6b4c ("drm/ttm: move memory accounting into vmwgfx v4")
but because of complexity it was hard to maintain. Some parts of the code
weren't freeing memory correctly and  some were missing accounting all
together. While those would be fairly easy to fix the fundamental reason
for memory accounting in the driver was the ability to invoke shrinker
which is part of TTM code as well (with support for unified memory
hopefully coming soon).

That meant that vmwgfx had a lot of code that was either unused or
duplicating code from TTM. Removing this code also prevents excessive
calls to global swapout which were common during memory pressure
because both vmwgfx and TTM would invoke the shrinker when memory
usage reached half of RAM.

Fixes: f07069da6b4c ("drm/ttm: move memory accounting into vmwgfx v4")
Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211206172620.3139754-2-zack@kde.org

1 files changed, 2 insertions, 18 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_binding.c b/drivers/gpu/drm/vmwgfx/vmwgfx_binding.c
index 6f27d69bad0e..fc8cc222ec51 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_binding.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_binding.c
@@ -1327,8 +1327,7 @@ static int vmw_binding_scrub_so(struct vmw_ctx_bindinfo *bi, bool rebind)
 }
 
 /**
- * vmw_binding_state_alloc - Allocate a struct vmw_ctx_binding_state with
- * memory accounting.
+ * vmw_binding_state_alloc - Allocate a struct vmw_ctx_binding_state.
  *
  * @dev_priv: Pointer to a device private structure.
  *
@@ -1338,20 +1337,9 @@ struct vmw_ctx_binding_state *
 vmw_binding_state_alloc(struct vmw_private *dev_priv)
 {
 	struct vmw_ctx_binding_state *cbs;
-	struct ttm_operation_ctx ctx = {
-		.interruptible = false,
-		.no_wait_gpu = false
-	};
-	int ret;
-
-	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), sizeof(*cbs),
-				&ctx);
-	if (ret)
-		return ERR_PTR(ret);
 
 	cbs = vzalloc(sizeof(*cbs));
 	if (!cbs) {
-		ttm_mem_global_free(vmw_mem_glob(dev_priv), sizeof(*cbs));
 		return ERR_PTR(-ENOMEM);
 	}
 
@@ -1362,17 +1350,13 @@ vmw_binding_state_alloc(struct vmw_private *dev_priv)
 }
 
 /**
- * vmw_binding_state_free - Free a struct vmw_ctx_binding_state and its
- * memory accounting info.
+ * vmw_binding_state_free - Free a struct vmw_ctx_binding_state.
  *
  * @cbs: Pointer to the struct vmw_ctx_binding_state to be freed.
  */
 void vmw_binding_state_free(struct vmw_ctx_binding_state *cbs)
 {
-	struct vmw_private *dev_priv = cbs->dev_priv;
-
 	vfree(cbs);
-	ttm_mem_global_free(vmw_mem_glob(dev_priv), sizeof(*cbs));
 }
 
 /**