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drm/i915/gtt: stop caching the scratch page 

Normal users shouldn't be hitting this, likely this would indicate a
userspace bug. So don't bother caching, which should be safe now that we
manually flush the page.

Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
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/20211028092638.3142258-2-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2021-10-28 10:26:38 +01:00
parent 2ca776068f
commit b0cc4dca4f
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/gt/gen8_ppgtt.c
View File

@ -651,7 +651,7 @@ static int gen8_init_scratch(struct i915_address_space *vm)
vm->scratch[0]->encode = vm->scratch[0]->encode =
gen8_pte_encode(px_dma(vm->scratch[0]), gen8_pte_encode(px_dma(vm->scratch[0]),
I915_CACHE_LLC, pte_flags); I915_CACHE_NONE, pte_flags);
for (i = 1; i <= vm->top; i++) { for (i = 1; i <= vm->top; i++) {
struct drm_i915_gem_object *obj; struct drm_i915_gem_object *obj;
@ -667,7 +667,7 @@ static int gen8_init_scratch(struct i915_address_space *vm)
} }
fill_px(obj, vm->scratch[i - 1]->encode); fill_px(obj, vm->scratch[i - 1]->encode);
obj->encode = gen8_pde_encode(px_dma(obj), I915_CACHE_LLC); obj->encode = gen8_pde_encode(px_dma(obj), I915_CACHE_NONE);
vm->scratch[i] = obj; vm->scratch[i] = obj;
} }