[Intel-gfx] [PATCH 3/3] drm/i915: Fix i915_ggtt_view_equal to handle rotation correctly

Daniel Vetter daniel.vetter at ffwll.ch
Wed Oct 14 07:51:06 PDT 2015

The rotated view depends upon the rotation paramters, but thus far we
didn't bother checking for those. This seems to have been an issue
ever since this was introduce in

commit fe14d5f4e5468c5b80a24f1a64abcbe116143670
Author: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Date:   Wed Dec 10 17:27:58 2014 +0000

    drm/i915: Infrastructure for supporting different GGTT views per object

But userspace is allowed to reuse framebuffer backing storage with
different framebuffers with different pixel formats/stride/whatever.
And e.g. SNA indeed does this. Hence we must check for all the
paramters to match, not just that it's rotated.

v2: intel_plane_obj_offset also needs to construct the full view, to
avoid fallout since they don't fully match.

Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
 drivers/gpu/drm/i915/i915_gem_gtt.h  |  2 +-
 drivers/gpu/drm/i915/intel_display.c | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 2e1f6493c9e7..8a36f4fcc676 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -551,7 +551,7 @@ i915_ggtt_view_equal(const struct i915_ggtt_view *a,
 	if (a->type != b->type)
 		return false;
-	if (a->type == I915_GGTT_VIEW_PARTIAL)
+	if (a->type != I915_GGTT_VIEW_NORMAL)
 		return !memcmp(&a->params, &b->params, sizeof(a->params));
 	return true;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 57459fedf216..2a5987ce576c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2894,16 +2894,16 @@ unsigned long intel_plane_obj_offset(struct intel_plane *intel_plane,
 				     struct drm_i915_gem_object *obj,
 				     unsigned int plane)
-	const struct i915_ggtt_view *view = &i915_ggtt_view_normal;
+	struct i915_ggtt_view view;
 	struct i915_vma *vma;
 	unsigned char *offset;
-	if (intel_rotation_90_or_270(intel_plane->base.state->rotation))
-		view = &i915_ggtt_view_rotated;
+	intel_fill_fb_ggtt_view(&view, intel_plane->base.fb,
+				intel_plane->base.state);
-	vma = i915_gem_obj_to_ggtt_view(obj, view);
+	vma = i915_gem_obj_to_ggtt_view(obj, &view);
 	if (WARN(!vma, "ggtt vma for display object not found! (view=%u)\n",
-		view->type))
+		view.type))
 		return -1;
 	offset = (unsigned char *)vma->node.start;

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