Extract of useful code from the timeline work. Let's use just a single
stub fence instance instead of allocating a new one all the time.
Signed-off-by: Chunming Zhou <david1.zhou@xxxxxxx>
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/drm_syncobj.c | 67 ++++++++++++++++++++++---------------------
1 file changed, 35 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index b92e3c726229..f78321338c1f 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -56,10 +56,8 @@
#include "drm_internal.h"
#include <drm/drm_syncobj.h>
-struct drm_syncobj_stub_fence {
- struct dma_fence base;
- spinlock_t lock;
-};
+static DEFINE_SPINLOCK(stub_fence_lock);
+static struct dma_fence stub_fence;
static const char *drm_syncobj_stub_fence_get_name(struct dma_fence *fence)
{
@@ -71,6 +69,25 @@ static const struct dma_fence_ops drm_syncobj_stub_fence_ops = {
.get_timeline_name = drm_syncobj_stub_fence_get_name,
};
+/**
+ * drm_syncobj_get_stub_fence - return a signaled fence
+ *
+ * Return a stub fence which is already signaled.
+ */
+static struct dma_fence *drm_syncobj_get_stub_fence(void)
+{
+ spin_lock(&stub_fence_lock);
+ if (!stub_fence.ops) {
+ dma_fence_init(&stub_fence,
+ &drm_syncobj_stub_fence_ops,
+ &stub_fence_lock,
+ 0, 0);
+ dma_fence_signal_locked(&stub_fence);
+ }
+ spin_unlock(&stub_fence_lock);
+
+ return dma_fence_get(&stub_fence);
+}
/**
* drm_syncobj_find - lookup and reference a sync object.
@@ -188,23 +205,18 @@ void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
}
EXPORT_SYMBOL(drm_syncobj_replace_fence);
-static int drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
+/**
+ * drm_syncobj_assign_null_handle - assign a stub fence to the sync object
+ * @syncobj: sync object to assign the fence on
+ *
+ * Assign a already signaled stub fence to the sync object.
+ */
+static void drm_syncobj_assign_null_handle(struct drm_syncobj *syncobj)
{
- struct drm_syncobj_stub_fence *fence;
- fence = kzalloc(sizeof(*fence), GFP_KERNEL);
- if (fence == NULL)
- return -ENOMEM;
+ struct dma_fence *fence = drm_syncobj_get_stub_fence();
- spin_lock_init(&fence->lock);
- dma_fence_init(&fence->base, &drm_syncobj_stub_fence_ops,
- &fence->lock, 0, 0);
- dma_fence_signal(&fence->base);
-
- drm_syncobj_replace_fence(syncobj, &fence->base);
-
- dma_fence_put(&fence->base);
-
- return 0;
+ drm_syncobj_replace_fence(syncobj, fence);
+ dma_fence_put(fence);
}
/**
@@ -272,7 +284,6 @@ EXPORT_SYMBOL(drm_syncobj_free);
int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
struct dma_fence *fence)
{
- int ret;
struct drm_syncobj *syncobj;
syncobj = kzalloc(sizeof(struct drm_syncobj), GFP_KERNEL);
@@ -283,13 +294,8 @@ int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
INIT_LIST_HEAD(&syncobj->cb_list);
spin_lock_init(&syncobj->lock);
- if (flags & DRM_SYNCOBJ_CREATE_SIGNALED) {
- ret = drm_syncobj_assign_null_handle(syncobj);
- if (ret < 0) {
- drm_syncobj_put(syncobj);
- return ret;
- }
- }
+ if (flags & DRM_SYNCOBJ_CREATE_SIGNALED)
+ drm_syncobj_assign_null_handle(syncobj);
if (fence)
drm_syncobj_replace_fence(syncobj, fence);
@@ -980,11 +986,8 @@ drm_syncobj_signal_ioctl(struct drm_device *dev, void *data,
if (ret < 0)
return ret;
- for (i = 0; i < args->count_handles; i++) {
- ret = drm_syncobj_assign_null_handle(syncobjs[i]);
- if (ret < 0)
- break;
- }
+ for (i = 0; i < args->count_handles; i++)
+ drm_syncobj_assign_null_handle(syncobjs[i]);
drm_syncobj_array_free(syncobjs, args->count_handles);
