Commit 63430347 authored by Matthew Auld's avatar Matthew Auld
Browse files

drm/i915/userptr: add paranoid flush-on-acquire 



Even though userptr objects are always coherent with the GPU, with no
way for userspace to change this with the set_caching ioctl, even on
non-LLC platforms, there is still the 'Bypass LCC' mocs setting, which
might permit reading the contents of main memory directly.

Signed-off-by: default avatarMatthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: default avatarThomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018174508.2137279-5-matthew.auld@intel.com
parent a035154d

drivers/gpu/drm/i915/gem/i915_gem_userptr.c

+4 −1
Original line number Diff line number Diff line
@@ -165,8 +165,11 @@ static int i915_gem_userptr_get_pages(struct drm_i915_gem_object *obj) 
		goto err;

	}



	sg_page_sizes = i915_sg_dma_sizes(st->sgl);

	WARN_ON_ONCE(!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE));

	if (i915_gem_object_can_bypass_llc(obj))

		obj->cache_dirty = true;



	sg_page_sizes = i915_sg_dma_sizes(st->sgl);

	__i915_gem_object_set_pages(obj, st, sg_page_sizes);



	return 0;