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

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
index cf11aa7..d77da59 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
@@ -286,6 +286,8 @@ __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
                                struct sg_table *pages,
                                bool needs_clflush)
 {
+       struct drm_i915_private *i915 = to_i915(obj->base.dev);
+
        GEM_BUG_ON(obj->mm.madv == __I915_MADV_PURGED);
 
        if (obj->mm.madv == I915_MADV_DONTNEED)
@@ -297,6 +299,16 @@ __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
                drm_clflush_sg(pages);
 
        __start_cpu_write(obj);
+       /*
+        * 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, we have a race window.
+        */
+       if (!HAS_LLC(i915))
+               obj->cache_dirty = true;
 }
 
 void i915_gem_object_put_pages_shmem(struct drm_i915_gem_object *obj, struct sg_table *pages)