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| author |   Chris Wilson <chris@chris-wilson.co.uk> | 2020-09-15 10:14:16 +0100 |
|---|---|---|
| committer |   Rodrigo Vivi <rodrigo.vivi@intel.com> | 2020-09-30 14:24:20 -0400 |
| commit | ba2ebf605d5f32a9be0f7b05d3174bbc501b83fe (patch) | |
| tree | b98432d7c7875954ecfe05dad6bff70ba9510cee /drivers/gpu/drm/i915/gem/i915_gem_pages.c | |
| parent | drm/i915/gem: Avoid implicit vmap for highmem on x86-32 (diff) | |
| download | linux-dev-ba2ebf605d5f32a9be0f7b05d3174bbc501b83fe.tar.xz linux-dev-ba2ebf605d5f32a9be0f7b05d3174bbc501b83fe.zip | |
drm/i915/gem: Prevent using pgprot_writecombine() if PAT is not supported
Let's not try and use PAT attributes for I915_MAP_WC if the CPU doesn't
support PAT.
Fixes: 6056e50033d9 ("drm/i915/gem: Support discontiguous lmem object maps")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v5.6+
Link: https://patchwork.freedesktop.org/patch/msgid/20200915091417.4086-2-chris@chris-wilson.co.uk
(cherry picked from commit 121ba69ffddc60df11da56f6d5b29bdb45c8eb80)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/gem/i915_gem_pages.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_pages.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c index 49ce5777c511..d6eeefab3d01 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c @@ -254,6 +254,10 @@ 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 && + !static_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); |