From: Christian K?nig <christian.koe...@amd.com>
This patch allows userspace to created zero sized buffers
for use as pure synchronization object.
Signed-off-by: Christian K?nig <christian.koenig at amd.com>
---
drivers/gpu/drm/radeon/radeon_drv.c | 3 ++-
drivers/gpu/drm/radeon/radeon_object.c | 2 +-
drivers/gpu/drm/radeon/radeon_vm.c | 3 +++
3 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c
b/drivers/gpu/drm/radeon/radeon_drv.c
index 86d6b56..5ec6273 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -84,9 +84,10 @@
* 2.39.0 - Add INFO query for number of active CUs
* 2.40.0 - Add RADEON_GEM_GTT_WC/UC, flush HDP cache before submitting
* CS to GPU
+ * 2.41.0 - Allow zero sized BOs
*/
#define KMS_DRIVER_MAJOR 2
-#define KMS_DRIVER_MINOR 40
+#define KMS_DRIVER_MINOR 41
#define KMS_DRIVER_PATCHLEVEL 0
int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags);
int radeon_driver_unload_kms(struct drm_device *dev);
diff --git a/drivers/gpu/drm/radeon/radeon_object.c
b/drivers/gpu/drm/radeon/radeon_object.c
index 480c87d..9dd670e 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -154,7 +154,7 @@ int radeon_bo_create(struct radeon_device *rdev,
size = ALIGN(size, PAGE_SIZE);
- if (kernel) {
+ if (kernel || size == 0) {
type = ttm_bo_type_kernel;
} else if (sg) {
type = ttm_bo_type_sg;
diff --git a/drivers/gpu/drm/radeon/radeon_vm.c
b/drivers/gpu/drm/radeon/radeon_vm.c
index 058f200..b2c336a 100644
--- a/drivers/gpu/drm/radeon/radeon_vm.c
+++ b/drivers/gpu/drm/radeon/radeon_vm.c
@@ -883,6 +883,9 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
uint32_t flags;
int r;
+ if (bo_va->bo && radeon_bo_size(bo_va->bo) == 0)
+ return 0;
+
if (!bo_va->it.start) {
dev_err(rdev->dev, "bo %p don't has a mapping in vm %p\n",
bo_va->bo, vm);
--
1.9.1
