[PATCH 5/8] drm/radeon: cope with foreign fences inside display

[Maarten Lankhorst]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
---
 drivers/gpu/drm/radeon/radeon.h         |  2 +-
 drivers/gpu/drm/radeon/radeon_display.c | 30 +++++++++++++++++++-----------
 2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 82b0e11ade89..9aa75c1af4f4 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -710,7 +710,7 @@ struct radeon_flip_work {
        uint64_t                        base;
        struct drm_pending_vblank_event *event;
        struct radeon_bo                *old_rbo;
-       struct radeon_fence             *fence;
+       struct fence                    *fence;
 };

 struct r500_irq_stat_regs {
diff --git a/drivers/gpu/drm/radeon/radeon_display.c 
b/drivers/gpu/drm/radeon/radeon_display.c
index 4eb37976f879..00ead8c2758a 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -402,14 +402,21 @@ static void radeon_flip_work_func(struct work_struct 
*__work)

         down_read(&rdev->exclusive_lock);
        if (work->fence) {
-               r = radeon_fence_wait(work->fence, false);
-               if (r == -EDEADLK) {
-                       up_read(&rdev->exclusive_lock);
-                       do {
-                               r = radeon_gpu_reset(rdev);
-                       } while (r == -EAGAIN);
-                       down_read(&rdev->exclusive_lock);
-               }
+               struct radeon_fence *fence;
+
+               fence = to_radeon_fence(work->fence);
+               if (fence && fence->rdev == rdev) {
+                       r = radeon_fence_wait(fence, false);
+                       if (r == -EDEADLK) {
+                               up_read(&rdev->exclusive_lock);
+                               do {
+                                       r = radeon_gpu_reset(rdev);
+                               } while (r == -EAGAIN);
+                               down_read(&rdev->exclusive_lock);
+                       }
+               } else
+                       r = fence_wait(work->fence, false);
+
                if (r)
                        DRM_ERROR("failed to wait on page flip fence (%d)!\n", 
r);

@@ -418,7 +425,8 @@ static void radeon_flip_work_func(struct work_struct 
*__work)
                 * confused about which BO the CRTC is scanning out
                 */

-               radeon_fence_unref(&work->fence);
+               fence_put(work->fence);
+               work->fence = NULL;
        }

        /* We borrow the event spin lock for protecting flip_status */
@@ -494,7 +502,7 @@ static int radeon_crtc_page_flip(struct drm_crtc *crtc,
                DRM_ERROR("failed to pin new rbo buffer before flip\n");
                goto cleanup;
        }
-       work->fence = (struct radeon_fence 
*)fence_get(reservation_object_get_excl(new_rbo->tbo.resv));
+       work->fence = fence_get(reservation_object_get_excl(new_rbo->tbo.resv));
        radeon_bo_get_tiling_flags(new_rbo, &tiling_flags, NULL);
        radeon_bo_unreserve(new_rbo);

@@ -576,7 +584,7 @@ pflip_cleanup:

 cleanup:
        drm_gem_object_unreference_unlocked(&work->old_rbo->gem_base);
-       radeon_fence_unref(&work->fence);
+       fence_put(work->fence);
        kfree(work);
        return r;
 }
-- 
2.0.4