drm/i915: Defer request freeing

With context destruction, we always want to be able to tear down the
underlying address space. This is invoked on the last unreference to the
context which could happen before we've moved all objects to the
inactive list. To enable a clean tear down the address space, make sure
to process the request free lastly.

Without this change, we cannot guarantee to we don't still have active
objects in the VM.

As an example of a failing case:
CTX-A is created, count=1
CTX-A is used during execbuf
	does a context switch count = 2
	and add_request count = 3
CTX B runs, switches, CTX-A count = 2
CTX-A is destroyed, count = 1
retire requests is called
	free_request from CTX-A, count = 0 <--- free context with active object

As mentioned above, by doing the free request after processing the
active list, we can avoid this case.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_gem.c

@@ -2423,6 +2423,8 @@ void i915_gem_reset(struct drm_device *dev)
 void
 i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
 {
+	LIST_HEAD(deferred_request_free);
+	struct drm_i915_gem_request *request;
 	uint32_t seqno;
 
 	if (list_empty(&ring->request_list))
@@ -2433,8 +2435,6 @@ i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
 	seqno = ring->get_seqno(ring, true);
 
 	while (!list_empty(&ring->request_list)) {
-		struct drm_i915_gem_request *request;
-
 		request = list_first_entry(&ring->request_list,
 					   struct drm_i915_gem_request,
 					   list);
@@ -2450,7 +2450,7 @@ i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
 		 */
 		ring->last_retired_head = request->tail;
 
-		i915_gem_free_request(request);
+		list_move_tail(&request->list, &deferred_request_free);
 	}
 
 	/* Move any buffers on the active list that are no longer referenced
@@ -2475,6 +2475,13 @@ i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
 		ring->trace_irq_seqno = 0;
 	}
 
+	/* Finish processing active list before freeing request */
+	while (!list_empty(&deferred_request_free)) {
+		request = list_first_entry(&deferred_request_free,
+					   struct drm_i915_gem_request,
+					   list);
+		i915_gem_free_request(request);
+	}
 	WARN_ON(i915_verify_lists(ring->dev));
 }