drm/i915: Revoke mmap before fence

Make sure we revoke the user's mmaps of this vma to force them to take a
pagefault *before* we remove the associated aperture detiling register.

Fixes: 0d86ee35097a ("drm/i915/gt: Make fence revocation unequivocal")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200403160951.8271-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 4cdd883..42b2f24 100644 (file)
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1258,6 +1258,9 @@ int __i915_vma_unbind(struct i915_vma *vma)
        GEM_BUG_ON(i915_vma_is_active(vma));
 
        if (i915_vma_is_map_and_fenceable(vma)) {
+               /* Force a pagefault for domain tracking on next user access */
+               i915_vma_revoke_mmap(vma);
+
                /*
                 * Check that we have flushed all writes through the GGTT
                 * before the unbind, other due to non-strict nature of those
@@ -1276,9 +1279,6 @@ int __i915_vma_unbind(struct i915_vma *vma)
                /* release the fence reg _after_ flushing */
                i915_vma_revoke_fence(vma);
 
-               /* Force a pagefault for domain tracking on next user access */
-               i915_vma_revoke_mmap(vma);
-
                __i915_vma_iounmap(vma);
                clear_bit(I915_VMA_CAN_FENCE_BIT, __i915_vma_flags(vma));
        }