Let's not try and use PAT attributes for I915_MAP_WC is the CPU doesn't
support PAT.
Fixes: 6056e50033d9 ("drm/i915/gem: Support discontiguous lmem object maps")
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.a...@intel.com>
Cc: <sta...@vger.kernel.org> # v5.6+
---
drivers/gpu/drm/i915/gem/i915_gem_pages.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 0c3d0d6429ae..d729f6d05b97 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -265,6 +265,9 @@ static void *i915_gem_object_map(struct drm_i915_gem_object
*obj,
if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC)
return NULL;
+ if (GEM_WARN_ON(type == I915_MAP_WC && !boot_cpu_has(X86_FEATURE_PAT)))
+ return NULL;
+
/* A single page can always be kmapped */
if (n_pte == 1 && type == I915_MAP_WB) {
struct page *page = sg_page(sgt->sgl);
--
2.20.1
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