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

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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: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211018174508.2137279-5-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2021-10-18 18:45:04 +01:00
parent a035154da4
commit 6343034771
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/i915/gem/i915_gem_userptr.c
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@ -165,8 +165,11 @@ alloc_table:
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;