drm/i915: Track old framebuffer instead of object

Daniel Vetter spotted a bug while reviewing some of my refactoring in this
are of the code. I'll quote:

"""
> @@ -9764,6 +9768,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
>  	work->event = event;
>  	work->crtc = crtc;
>  	work->old_fb_obj = intel_fb_obj(old_fb);
> +	work->old_tiling_mode = to_intel_framebuffer(old_fb)->tiling_mode;

Hm, that's actually an interesting bugfix - currently userspace could be
sneaky and destroy the old fb immediately after the flip completes and the
change the tiling of the underlying object before the unpin work had a
chance to run (needs some fudgin with rt prios to starve workers to make
this work though).

Imo the right fix is to hold a reference onto the fb and not the
underlying gem object. With that tiling is guaranteed not to change.
"""

This patch tries to implement the above proposed change.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 8 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ebf973c303b7..213b870ae06e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9055,9 +9055,9 @@ static void intel_unpin_work_fn(struct work_struct *__work)
         enum pipe pipe = to_intel_crtc(work->crtc)->pipe;
 
         mutex_lock(&dev->struct_mutex);
-        intel_unpin_fb_obj(work->old_fb_obj);
+        intel_unpin_fb_obj(intel_fb_obj(work->old_fb));
         drm_gem_object_unreference(&work->pending_flip_obj->base);
-        drm_gem_object_unreference(&work->old_fb_obj->base);
+        drm_framebuffer_unreference(work->old_fb);
 
         intel_fbc_update(dev);
 
@@ -9760,7 +9760,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 
         work->event = event;
         work->crtc = crtc;
-        work->old_fb_obj = intel_fb_obj(old_fb);
+        work->old_fb = old_fb;
         INIT_WORK(&work->work, intel_unpin_work_fn);
 
         ret = drm_crtc_vblank_get(crtc);
@@ -9796,7 +9796,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
                 goto cleanup;
 
         /* Reference the objects for the scheduled work. */
-        drm_gem_object_reference(&work->old_fb_obj->base);
+        drm_framebuffer_reference(work->old_fb);
         drm_gem_object_reference(&obj->base);
 
         crtc->primary->fb = fb;
@@ -9818,7 +9818,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
 
         if (IS_VALLEYVIEW(dev)) {
                 ring = &dev_priv->ring[BCS];
-                if (obj->tiling_mode != work->old_fb_obj->tiling_mode)
+                if (obj->tiling_mode != intel_fb_obj(work->old_fb)->tiling_mode)
                         /* vlv: DISPLAY_FLIP fails to change tiling */
                         ring = NULL;
         } else if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) {
@@ -9859,7 +9859,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc,
         work->flip_queued_vblank = drm_vblank_count(dev, intel_crtc->pipe);
         work->enable_stall_check = true;
 
-        i915_gem_track_fb(work->old_fb_obj, obj,
+        i915_gem_track_fb(intel_fb_obj(work->old_fb), obj,
                           INTEL_FRONTBUFFER_PRIMARY(pipe));
 
         intel_fbc_disable(dev);
@@ -9875,7 +9875,7 @@ cleanup_unpin:
 cleanup_pending:
         atomic_dec(&intel_crtc->unpin_work_count);
         crtc->primary->fb = old_fb;
-        drm_gem_object_unreference(&work->old_fb_obj->base);
+        drm_framebuffer_unreference(work->old_fb);
         drm_gem_object_unreference(&obj->base);
         mutex_unlock(&dev->struct_mutex);
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index eef79ccd0b7c..f048f8bb8beb 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -710,7 +710,7 @@ intel_get_crtc_for_plane(struct drm_device *dev, int plane)
 struct intel_unpin_work {
         struct work_struct work;
         struct drm_crtc *crtc;
-        struct drm_i915_gem_object *old_fb_obj;
+        struct drm_framebuffer *old_fb;
         struct drm_i915_gem_object *pending_flip_obj;
         struct drm_pending_vblank_event *event;
         atomic_t pending;