[PATCH] drm/fence: add drm_crtc_create_fence()

[Gustavo Padovan]

From: Gustavo Padovan <gustavo.pado...@collabora.co.uk>

Instead of dealing with crtc details inside drm_atomic.c we should
just export a function that creates a new crtc fence for us and
use that.

Suggested-by: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.co.uk>
---
 drivers/gpu/drm/drm_atomic.c        | 16 +---------------
 drivers/gpu/drm/drm_crtc.c          | 18 +++++++++++++++++-
 drivers/gpu/drm/drm_crtc_internal.h |  2 +-
 3 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 19d7bcb..72fa5b2 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1864,20 +1864,6 @@ EXPORT_SYMBOL(drm_atomic_clean_old_fb);
  *     helpers and for the DRM event handling for existing userspace.
  */

-static struct dma_fence *get_crtc_fence(struct drm_crtc *crtc)
-{
-       struct dma_fence *fence;
-
-       fence = kzalloc(sizeof(*fence), GFP_KERNEL);
-       if (!fence)
-               return NULL;
-
-       dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
-                      crtc->fence_context, ++crtc->fence_seqno);
-
-       return fence;
-}
-
 struct drm_out_fence_state {
        s64 __user *out_fence_ptr;
        struct sync_file *sync_file;
@@ -1959,7 +1945,7 @@ static int prepare_crtc_signaling(struct drm_device *dev,
                        f[*num_fences].out_fence_ptr = fence_ptr;
                        *fence_state = f;

-                       fence = get_crtc_fence(crtc);
+                       fence = drm_crtc_create_fence(crtc);
                        if (!fence)
                                return -ENOMEM;

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 90931e0..e75f62c 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -152,6 +152,8 @@ static void drm_crtc_crc_fini(struct drm_crtc *crtc)
 #endif
 }

+static const struct dma_fence_ops drm_crtc_fence_ops;
+
 static struct drm_crtc *fence_to_crtc(struct dma_fence *fence)
 {
        BUG_ON(fence->ops != &drm_crtc_fence_ops);
@@ -177,13 +179,27 @@ static bool drm_crtc_fence_enable_signaling(struct 
dma_fence *fence)
        return true;
 }

-const struct dma_fence_ops drm_crtc_fence_ops = {
+static const struct dma_fence_ops drm_crtc_fence_ops = {
        .get_driver_name = drm_crtc_fence_get_driver_name,
        .get_timeline_name = drm_crtc_fence_get_timeline_name,
        .enable_signaling = drm_crtc_fence_enable_signaling,
        .wait = dma_fence_default_wait,
 };

+struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc)
+{
+       struct dma_fence *fence;
+
+       fence = kzalloc(sizeof(*fence), GFP_KERNEL);
+       if (!fence)
+               return NULL;
+
+       dma_fence_init(fence, &drm_crtc_fence_ops, &crtc->fence_lock,
+                      crtc->fence_context, ++crtc->fence_seqno);
+
+       return fence;
+}
+
 /**
  * drm_crtc_init_with_planes - Initialise a new CRTC object with
  *    specified primary and cursor planes.
diff --git a/drivers/gpu/drm/drm_crtc_internal.h 
b/drivers/gpu/drm/drm_crtc_internal.h
index 33b17d0..cdf6860 100644
--- a/drivers/gpu/drm/drm_crtc_internal.h
+++ b/drivers/gpu/drm/drm_crtc_internal.h
@@ -43,7 +43,7 @@ int drm_crtc_check_viewport(const struct drm_crtc *crtc,
 int drm_crtc_register_all(struct drm_device *dev);
 void drm_crtc_unregister_all(struct drm_device *dev);

-extern const struct dma_fence_ops drm_crtc_fence_ops;
+struct dma_fence *drm_crtc_create_fence(struct drm_crtc *crtc);

 /* IOCTLs */
 int drm_mode_getcrtc(struct drm_device *dev,
-- 
2.5.5