From: Thierry Reding <tred...@nvidia.com>
Implement the ->begin_cpu_access() and ->end_cpu_access() callbacks to
allow userspace to invalidate the cache before accessing a buffer that
is exported using PRIME and flush the cache after modifying the buffer
through its userspace mapping.
Signed-off-by: Thierry Reding <tred...@nvidia.com>
---
drivers/gpu/drm/nouveau/nouveau_prime.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/gpu/drm/nouveau/nouveau_prime.c
b/drivers/gpu/drm/nouveau/nouveau_prime.c
index 5d885d7cb059..a3a586ce864c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_prime.c
+++ b/drivers/gpu/drm/nouveau/nouveau_prime.c
@@ -29,6 +29,26 @@
#include "nouveau_drv.h"
#include "nouveau_gem.h"
+static int nouveau_gem_prime_begin_cpu_access(struct dma_buf *buf,
+ enum dma_data_direction direction)
+{
+ struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
+
+ nouveau_bo_sync_for_cpu(bo);
+
+ return 0;
+}
+
+static int nouveau_gem_prime_end_cpu_access(struct dma_buf *buf,
+ enum dma_data_direction direction)
+{
+ struct nouveau_bo *bo = nouveau_gem_object(buf->priv);
+
+ nouveau_bo_sync_for_device(bo);
+
+ return 0;
+}
+
static void *nouveau_gem_prime_kmap_atomic(struct dma_buf *buf,
unsigned long page)
{
@@ -106,6 +126,8 @@ static const struct dma_buf_ops
nouveau_gem_prime_dmabuf_ops = {
.map_dma_buf = drm_gem_map_dma_buf,
.unmap_dma_buf = drm_gem_unmap_dma_buf,
.release = drm_gem_dmabuf_release,
+ .begin_cpu_access = nouveau_gem_prime_begin_cpu_access,
+ .end_cpu_access = nouveau_gem_prime_end_cpu_access,
.map_atomic = nouveau_gem_prime_kmap_atomic,
.unmap_atomic = nouveau_gem_prime_kunmap_atomic,
.map = nouveau_gem_prime_kmap,
--
2.15.1
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