drm/i915: Prevent MI_DISPLAY_FLIP straddling two cachelines on IVB

According to BSpec the entire MI_DISPLAY_FLIP packet must be contained
in a single cacheline. Make sure that happens.

v2: Use intel_ring_begin_cacheline_safe()
v3: Use intel_ring_cacheline_align() (Chris)

Cc: Bjoern C <lkml@call-home.ch>
Cc: Alexandru DAMIAN <alexandru.damian@intel.com>
Cc: Enrico Tagliavini <enrico.tagliavini@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74053
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 40a9338ad54f1fbe12f1c00930356396f92736e5..88ad172143c6c25cd8d7115d911ca82670be6119 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -8586,6 +8586,20 @@ static int intel_gen7_queue_flip(struct drm_device *dev,
        if (ring->id == RCS)
                len += 6;
 
+       /*
+        * BSpec MI_DISPLAY_FLIP for IVB:
+        * "The full packet must be contained within the same cache line."
+        *
+        * Currently the LRI+SRM+MI_DISPLAY_FLIP all fit within the same
+        * cacheline, if we ever start emitting more commands before
+        * the MI_DISPLAY_FLIP we may need to first emit everything else,
+        * then do the cacheline alignment, and finally emit the
+        * MI_DISPLAY_FLIP.
+        */
+       ret = intel_ring_cacheline_align(ring);
+       if (ret)
+               goto err_unpin;
+
        ret = intel_ring_begin(ring, len);
        if (ret)
                goto err_unpin;