drm/i915: Store a persistent reference for an object in the execbuffer cache

If we take a reference to the object/vma when it is first used in an
execbuf, we can keep that reference until the object's file-local handle
is closed. Thereby saving a frequent ref/unref pair.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 23f74014e158..39ed58a21fc1 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -152,6 +152,7 @@ static void vma_lut_free(struct i915_gem_context *ctx)
 		hlist_for_each_entry(vma, &lut->ht[i], ctx_node) {
 			vma->obj->vma_hashed = NULL;
 			vma->ctx = NULL;
+			i915_vma_put(vma);
 		}
 	}
 	kvfree(lut->ht);