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.
v2(Thomas):
- Make sure we use drm_clflush_virt_range here, in case clflush support
is missing.
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>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211028092638.3142258-1-matthew.auld@intel.com
#include <linux/fault-inject.h>
+#include <drm/drm_cache.h>
+
#include "gem/i915_gem_lmem.h"
#include "i915_trace.h"
#include "intel_gt.h"
val = POISON_FREE;
memset(vaddr, val, scratch->base.size);
+ drm_clflush_virt_range(vaddr, scratch->base.size);
}
int setup_scratch_page(struct i915_address_space *vm)