[PATCH v6 5/5] dma-buf/sync_file: only enable fence signalling on poll()

[Gustavo Padovan]

From: Gustavo Padovan <gustavo.padovan at collabora.co.uk>

Signalling doesn't need to be enabled at sync_file creation, it is only
required if userspace waiting the fence to signal through poll().

Thus we delay fence_add_callback() until poll is called. It only adds the
callback the first time poll() is called. This avoid re-adding the same
callback multiple times.

v2: rebase and update to work with new fence support for sync_file

v3: use atomic operation to set enabled and protect fence_add_callback()

v4: use user bit from fence flags (comment from Chris Wilson)

v5: use ternary if on poll return (comment from Chris Wilson)

Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/dma-buf/sync_file.c | 20 ++++++++------------
 include/linux/sync_file.h   |  2 ++
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/dma-buf/sync_file.c b/drivers/dma-buf/sync_file.c
index 2873760..82b5334 100644
--- a/drivers/dma-buf/sync_file.c
+++ b/drivers/dma-buf/sync_file.c
@@ -86,8 +86,6 @@ struct sync_file *sync_file_create(struct fence *fence)
 		 fence->ops->get_timeline_name(fence), fence->context,
 		 fence->seqno);
 
-	fence_add_callback(fence, &sync_file->cb, fence_check_cb_func);
-
 	return sync_file;
 }
 EXPORT_SYMBOL(sync_file_create);
@@ -274,9 +272,6 @@ static struct sync_file *sync_file_merge(const char *name, struct sync_file *a,
 		goto err;
 	}
 
-	fence_add_callback(sync_file->fence, &sync_file->cb,
-			   fence_check_cb_func);
-
 	strlcpy(sync_file->name, name, sizeof(sync_file->name));
 	return sync_file;
 
@@ -291,7 +286,8 @@ static void sync_file_free(struct kref *kref)
 	struct sync_file *sync_file = container_of(kref, struct sync_file,
 						     kref);
 
-	fence_remove_callback(sync_file->fence, &sync_file->cb);
+	if (test_bit(POLL_ENABLED, &sync_file->fence->flags))
+		fence_remove_callback(sync_file->fence, &sync_file->cb);
 	fence_put(sync_file->fence);
 	kfree(sync_file);
 }
@@ -311,13 +307,13 @@ static unsigned int sync_file_poll(struct file *file, poll_table *wait)
 
 	poll_wait(file, &sync_file->wq, wait);
 
-	status = fence_is_signaled(sync_file->fence);
+	if (!test_and_set_bit(POLL_ENABLED, &sync_file->fence->flags)) {
+		if (fence_add_callback(sync_file->fence, &sync_file->cb,
+				   fence_check_cb_func) < 0)
+			wake_up_all(&sync_file->wq);
+	}
 
-	if (status)
-		return POLLIN;
-	if (status < 0)
-		return POLLERR;
-	return 0;
+	return fence_is_signaled(sync_file->fence) ? POLLIN : 0;
 }
 
 static long sync_file_ioctl_merge(struct sync_file *sync_file,
diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h
index f7de5a0..aa17ccf 100644
--- a/include/linux/sync_file.h
+++ b/include/linux/sync_file.h
@@ -45,6 +45,8 @@ struct sync_file {
 	struct fence_cb cb;
 };
 
+#define POLL_ENABLED FENCE_FLAG_USER_BITS
+
 struct sync_file *sync_file_create(struct fence *fence);
 struct fence *sync_file_get_fence(int fd);
 
-- 
2.5.5