[Intel-gfx] [PATCH] drm/i915/gt: Clear LOCAL_BIND from shared GGTT on resume

[Chris Wilson]

We only restore GLOBAL binds upon resume as we expect these to be pinned
for use by HW, whereas the LOCAL binds can be recreated on demand once
userspace is resumed. For the LOCAL bind to be recreated in the global
GTT, we need to clear its presence flag on deciding not to restore the
mapping upon resume.

Fixes: bf0840cdb304 ("drm/i915/gt: Stop cross-polluting PIN_GLOBAL with PIN_USER with no-ppgtt")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_ggtt.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c
index 8c275f8588c3..317172ad5ef3 100644
--- a/drivers/gpu/drm/i915/gt/intel_ggtt.c
+++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c
@@ -1161,6 +1161,11 @@ void i915_ggtt_disable_guc(struct i915_ggtt *ggtt)
 	ggtt->invalidate(ggtt);
 }
 
+static unsigned int clear_bind(struct i915_vma *vma)
+{
+	return atomic_fetch_and(~I915_VMA_BIND_MASK, &vma->flags);
+}
+
 void i915_ggtt_resume(struct i915_ggtt *ggtt)
 {
 	struct i915_vma *vma;
@@ -1179,10 +1184,9 @@ void i915_ggtt_resume(struct i915_ggtt *ggtt)
 	list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link) {
 		struct drm_i915_gem_object *obj = vma->obj;
 
-		if (!i915_vma_is_bound(vma, I915_VMA_GLOBAL_BIND))
+		if (!(clear_bind(vma) & I915_VMA_GLOBAL_BIND))
 			continue;
 
-		clear_bit(I915_VMA_GLOBAL_BIND_BIT, __i915_vma_flags(vma));
 		WARN_ON(i915_vma_bind(vma,
 				      obj ? obj->cache_level : 0,
 				      PIN_GLOBAL, NULL));
-- 
2.20.1