On a non-llc system, the objects are created with .cache_level =
CACHE_NONE and so the transition to uncached for scanout is a no-op.
However, if the object was never written to, it will still be in the CPU
domain (having been zeroed out by shmemfs). Those cachelines need to be
flushed prior to display.
Reported-by: Vito Caputo
Fixes: a6a7cc4b7db6 ("drm/i915: Always flush the dirty CPU cache when pinning
the scanout")
Signed-off-by: Chris Wilson <[email protected]>
Cc: <[email protected]> # v4.10-rc1+
---
drivers/gpu/drm/i915/i915_gem.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 76689b59fc90..e64d0ea6113d 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2327,6 +2327,7 @@ static void i915_sg_trim(struct sg_table *orig_st)
if (sg_alloc_table(&new_st, orig_st->nents, GFP_KERNEL | __GFP_NOWARN))
return;
+ new_st->orig_nents = orig_st->orig_nents; /* XXX lies for
new_sg = new_st.sgl;
for_each_sg(orig_st->sgl, sg, orig_st->nents, i) {
sg_set_page(new_sg, sg_page(sg), sg->length, 0);
@@ -3514,7 +3515,7 @@ i915_gem_object_pin_to_display_plane(struct
drm_i915_gem_object *obj,
vma->display_alignment = max_t(u64, vma->display_alignment, alignment);
/* Treat this as an end-of-frame, like intel_user_framebuffer_dirty() */
- if (obj->cache_dirty) {
+ if (obj->cache_dirty || obj->base.write_domain == I915_GEM_DOMAIN_CPU) {
i915_gem_clflush_object(obj, true);
intel_fb_obj_flush(obj, false, ORIGIN_DIRTYFB);
}
--
2.11.0
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