The scratch page is directly visible in the users address space, and while this is forced as CACHE_LLC, by the kernel, we still have to contend with things like "Bypass-LLC" MOCS. So just flush no matter what.
Signed-off-by: Matthew Auld matthew.auld@intel.com Cc: Thomas Hellström thomas.hellstrom@linux.intel.com Cc: Chris Wilson chris@chris-wilson.co.uk Cc: Ramalingam C ramalingam.c@intel.com --- drivers/gpu/drm/i915/gt/intel_gtt.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_gtt.c b/drivers/gpu/drm/i915/gt/intel_gtt.c index 67d14afa6623..b6c088423319 100644 --- a/drivers/gpu/drm/i915/gt/intel_gtt.c +++ b/drivers/gpu/drm/i915/gt/intel_gtt.c @@ -273,6 +273,7 @@ static void poison_scratch_page(struct drm_i915_gem_object *scratch) val = POISON_FREE;
memset(vaddr, val, scratch->base.size); + clflush_cache_range(vaddr, scratch->base.size); }
int setup_scratch_page(struct i915_address_space *vm)