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drm/i915: drop the __i915_active_call pointer packing

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We use some of the lower bits of the retire function pointer for
potential flags, which is quite thorny, since the caller needs to
remember to give the function the correct alignment with
__i915_active_call, otherwise we might incorrectly unpack the pointer
and jump to some garbage address later. Instead of all this let's just
pass the flags along as a separate parameter.

Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: Daniel Vetter <daniel@ffwll.ch>
References: ca419f407b ("drm/i915: Fix crash in auto_retire")
References: d8e44e4dd2 ("drm/i915/overlay: Fix active retire callback alignment")
References: fd5f262db1 ("drm/i915/selftests: Fix active retire callback alignment")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210504164136.96456-1-matthew.auld@intel.com
This commit is contained in:
Matthew Auld
2021-05-04 17:41:36 +01:00
parent 0a46be95c2
commit c3b147604f
15 changed files with 28 additions and 41 deletions
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3
drivers/gpu/drm/i915/i915_vma.c
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@@ -94,7 +94,6 @@ static int __i915_vma_active(struct i915_active *ref)
return i915_vma_tryget(active_to_vma(ref)) ? 0 : -ENOENT;
}
__i915_active_call
static void __i915_vma_retire(struct i915_active *ref)
{
i915_vma_put(active_to_vma(ref));
@@ -125,7 +124,7 @@ vma_create(struct drm_i915_gem_object *obj,
vma->size = obj->base.size;
vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire);
i915_active_init(&vma->active, __i915_vma_active, __i915_vma_retire, 0);
/* Declare ourselves safe for use inside shrinkers */
if (IS_ENABLED(CONFIG_LOCKDEP)) {