[Intel-gfx] [PATCH] drm/i915/gem: Defer obj->base.resv fini until RCU callback

[Chris Wilson]

Since reservation_object_fini() does an immediate free, rather than
kfree_rcu as normal, we have to delay the release until after the RCU
grace period has elapsed (i.e. from the rcu cleanup callback) so that we
can rely on the RCU protected access to the fences while the object is a
zombie.

i915_gem_busy_ioctl relies on having an RCU barrier to protect the
reservation in order to avoid having to take a reference and strong
memory barriers.

Fixes: c03467ba40f7 ("drm/i915/gem: Free pages before rcu-freeing the object")
Testcase: igt/gem_busy/close-race
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.c | 3 ++-
 drivers/gpu/drm/i915/gem/i915_gem_shmem.c  | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index d3e96f09c6b7..0dced4a20e20 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -152,6 +152,7 @@ static void __i915_gem_free_object_rcu(struct rcu_head *head)
 		container_of(head, typeof(*obj), rcu);
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 
+	reservation_object_fini(&obj->base._resv);
 	i915_gem_object_free(obj);
 
 	GEM_BUG_ON(!atomic_read(&i915->mm.free_count));
@@ -198,7 +199,7 @@ static void __i915_gem_free_objects(struct drm_i915_private *i915,
 		if (obj->base.import_attach)
 			drm_prime_gem_destroy(&obj->base, NULL);
 
-		drm_gem_object_release(&obj->base);
+		drm_gem_free_mmap_offset(&obj->base);
 
 		/* But keep the pointer alive for RCU-protected lookups */
 		call_rcu(&obj->rcu, __i915_gem_free_object_rcu);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
index 19d9ecdb2894..d2a1158868e7 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
@@ -414,6 +414,11 @@ shmem_pwrite(struct drm_i915_gem_object *obj,
 	return 0;
 }
 
+static void shmem_release(struct drm_i915_gem_object *obj)
+{
+	fput(obj->base.filp);
+}
+
 const struct drm_i915_gem_object_ops i915_gem_shmem_ops = {
 	.flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
 		 I915_GEM_OBJECT_IS_SHRINKABLE,
@@ -424,6 +429,8 @@ const struct drm_i915_gem_object_ops i915_gem_shmem_ops = {
 	.writeback = shmem_writeback,
 
 	.pwrite = shmem_pwrite,
+
+	.release = shmem_release,
 };
 
 static int create_shmem(struct drm_i915_private *i915,
-- 
2.20.1