[PATCH v4 05/13] drm/mgag200: Use drm_gem_shmem_vmap_local() in damage handling

Thomas Zimmermann
2021-01-08T09:43:32Z

Damage handling in mgag200 requires a short-term mapping of the source
BO. Use drm_gem_shmem_vmap_local().

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c
b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 1dfc42170059..a33e28d4c5e9 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1552,22 +1552,32 @@ mgag200_handle_damage(struct mga_device *mdev, struct
drm_framebuffer *fb,
 		      struct drm_rect *clip)
 {
 	struct drm_device *dev = &mdev->base;
+	struct drm_gem_object *obj = fb->obj[0];
 	struct dma_buf_map map;
 	void *vmap;
 	int ret;

-	ret = drm_gem_shmem_vmap(fb->obj[0], &map);
+	ret = dma_resv_lock(obj->resv, NULL);
 	if (drm_WARN_ON(dev, ret))
-		return; /* BUG: SHMEM BO should always be vmapped */
+		return;
+	ret = drm_gem_shmem_vmap_local(obj, &map);
+	if (drm_WARN_ON(dev, ret))
+		goto err_dma_resv_unlock; /* BUG: SHMEM BO should always be vmapped */
 	vmap = map.vaddr; /* TODO: Use mapping abstraction properly */

 	drm_fb_memcpy_dstclip(mdev->vram, vmap, fb, clip);

-	drm_gem_shmem_vunmap(fb->obj[0], &map);
+	drm_gem_shmem_vunmap_local(obj, &map);
+	dma_resv_unlock(obj->resv);

 	/* Always scanout image at VRAM offset 0 */
 	mgag200_set_startadd(mdev, (u32)0);
 	mgag200_set_offset(mdev, fb);
+
+	return;
+
+err_dma_resv_unlock:
+	dma_resv_unlock(obj->resv);
 }

 static void
--
2.29.2