drm/i915/bdw: Make sure gpu reset still works with Execlists

If we reset a ring after a hang, we have to make sure that we clear
out all queued Execlists requests.

v2: The ring is, at this point, already being correctly re-programmed
for Execlists, and the hangcheck counters cleared.

v3: Daniel suggests to drop the "if (execlists)" because the Execlists
queue should be empty in legacy mode (which is true, if we do the
INIT_LIST_HEAD).

v4: Do the pending intel_runtime_pm_put

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 32fa1e9eb844..aa4103bdd352 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2551,6 +2551,18 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
                 i915_gem_free_request(request);
         }
 
+        while (!list_empty(&ring->execlist_queue)) {
+                struct intel_ctx_submit_request *submit_req;
+
+                submit_req = list_first_entry(&ring->execlist_queue,
+                                struct intel_ctx_submit_request,
+                                execlist_link);
+                list_del(&submit_req->execlist_link);
+                intel_runtime_pm_put(dev_priv);
+                i915_gem_context_unreference(submit_req->ctx);
+                kfree(submit_req);
+        }
+
         /* These may not have been flush before the reset, do so now */
         kfree(ring->preallocated_lazy_request);
         ring->preallocated_lazy_request = NULL;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 13543f8528c2..4fb1ec95ec08 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1612,6 +1612,7 @@ static int intel_init_ring_buffer(struct drm_device *dev,
         ring->dev = dev;
         INIT_LIST_HEAD(&ring->active_list);
         INIT_LIST_HEAD(&ring->request_list);
+        INIT_LIST_HEAD(&ring->execlist_queue);
         ringbuf->size = 32 * PAGE_SIZE;
         ringbuf->ring = ring;
         memset(ring->semaphore.sync_seqno, 0, sizeof(ring->semaphore.sync_seqno));