drm/i915/guc: Wait for doorbell to be inactive before deallocating

Doorbell release flow requires that we wait for GEN8_DRB_VALID bit to go
to zero after updating db_status before we call the GuC to release the
doorbell.

Kudos to Daniele for finding this out.

v2: WARN instead of DRM_ERROR (Joonas)

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index e98cb74..60add04 100644 (file)
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -206,12 +206,22 @@ static int __create_doorbell(struct i915_guc_client *client)
 
 static int __destroy_doorbell(struct i915_guc_client *client)
 {
+       struct drm_i915_private *dev_priv = guc_to_i915(client->guc);
        struct guc_doorbell_info *doorbell;
+       u16 db_id = client->doorbell_id;
+
+       GEM_BUG_ON(db_id >= GUC_DOORBELL_INVALID);
 
        doorbell = __get_doorbell(client);
        doorbell->db_status = GUC_DOORBELL_DISABLED;
        doorbell->cookie = 0;
 
+       /* Doorbell release flow requires that we wait for GEN8_DRB_VALID bit
+        * to go to zero after updating db_status before we call the GuC to
+        * release the doorbell */
+       if (wait_for_us(!(I915_READ(GEN8_DRBREGL(db_id)) & GEN8_DRB_VALID), 10))
+               WARN_ONCE(true, "Doorbell never became invalid after disable\n");
+
        return __guc_deallocate_doorbell(client->guc, client->ctx_index);
 }