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| /openbmc/linux/drivers/gpu/drm/i915/gem/ |
| H A D | i915_gem_shmem.c | d70af579 Mon Oct 18 12:45:05 CDT 2021 Matthew Auld <matthew.auld@intel.com> drm/i915/shmem: ensure flush during swap-in on non-LLC
On non-LLC platforms, force the flush-on-acquire if this is ever
swapped-in. Our async flush path is not trust worthy enough yet(and
happens in the wrong order), and with some tricks it's conceivable for
userspace to change the cache-level to I915_CACHE_NONE after the pages
are swapped-in, and since execbuf binds the object before doing the
async flush, there is a potential race window.
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/20211018174508.2137279-6-matthew.auld@intel.com
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