[PATCH 04/12] drm/syncobj: add drm_syncobj_register_eventfd

[Julian Orth <ju.orth@gmail.com>]

This makes the logic from drm_syncobj_eventfd_ioctl available to callers
that already have a drm_syncobj.

Signed-off-by: Julian Orth <ju.orth@gmail.com>
---
 drivers/gpu/drm/drm_syncobj.c | 37 ++++++++++++++++++++++++++++++-------
 include/drm/drm_syncobj.h     |  2 ++
 2 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 648afd1f4fdd..3e8fb7e0cace 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1502,8 +1502,6 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 {
 	struct drm_syncobj_eventfd *args = data;
 	struct drm_syncobj *syncobj;
-	struct eventfd_ctx *ev_fd_ctx;
-	struct syncobj_eventfd_entry *entry;
 	int ret;
 
 	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE))
@@ -1519,7 +1517,33 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 	if (!syncobj)
 		return -ENOENT;
 
-	ev_fd_ctx = eventfd_ctx_fdget(args->fd);
+	ret = drm_syncobj_register_eventfd(syncobj, args->fd, args->point, args->flags);
+
+	drm_syncobj_put(syncobj);
+
+	return ret;
+}
+
+/**
+ * drm_syncobj_register_eventfd - register an eventfd for a syncobj
+ * @syncobj: sync object to add the eventfd to
+ * @ev_fd: eventfd file descriptor to signal
+ * @point: timeline point to wait for
+ * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE or 0
+ *
+ * Registers an eventfd that will be signaled when the point is
+ * signaled or available.
+ *
+ * Returns 0 on success or a negative error value on failure.
+ */
+int drm_syncobj_register_eventfd(struct drm_syncobj *syncobj,
+				 int ev_fd, u64 point, u32 flags)
+{
+	struct eventfd_ctx *ev_fd_ctx;
+	struct syncobj_eventfd_entry *entry;
+	int ret;
+
+	ev_fd_ctx = eventfd_ctx_fdget(ev_fd);
 	if (IS_ERR(ev_fd_ctx)) {
 		ret = PTR_ERR(ev_fd_ctx);
 		goto err_fdget;
@@ -1532,20 +1556,19 @@ drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data,
 	}
 	entry->syncobj = syncobj;
 	entry->ev_fd_ctx = ev_fd_ctx;
-	entry->point = args->point;
-	entry->flags = args->flags;
+	entry->point = point;
+	entry->flags = flags;
 
 	drm_syncobj_add_eventfd(syncobj, entry);
-	drm_syncobj_put(syncobj);
 
 	return 0;
 
 err_kzalloc:
 	eventfd_ctx_put(ev_fd_ctx);
 err_fdget:
-	drm_syncobj_put(syncobj);
 	return ret;
 }
+EXPORT_SYMBOL(drm_syncobj_register_eventfd);
 
 int
 drm_syncobj_reset_ioctl(struct drm_device *dev, void *data,
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
index 7677fd995be0..85e7ca7f7896 100644
--- a/include/drm/drm_syncobj.h
+++ b/include/drm/drm_syncobj.h
@@ -134,6 +134,8 @@ signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 					   uint32_t count, uint32_t flags,
 					   signed long timeout, uint32_t *idx,
 					   ktime_t *deadline);
+int drm_syncobj_register_eventfd(struct drm_syncobj *syncobj,
+				 int ev_fd, u64 point, u32 flags);
 void drm_syncobj_free(struct kref *kref);
 int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
 		       struct dma_fence *fence);

-- 
2.54.0