[Mesa-dev] [PATCH v2 2/3] i965/gen10+: Enable object level preemption.

[Chris Wilson]

Quoting Rafael Antognolli (2018-10-29 17:19:53)
> +void
> +brw_enable_obj_preemption(struct brw_context *brw, bool enable)
> +{
> +   const struct gen_device_info *devinfo = &brw->screen->devinfo;
> +   assert(devinfo->gen >= 9);
> +
> +   if (enable == brw->object_preemption)
> +      return;
> +
> +   /* A fixed function pipe flush is required before modifying this field */
> +   brw_emit_pipe_control_flush(brw, PIPE_CONTROL_FLUSH_ENABLE);
> +
> +   bool replay_mode = enable ?
> +      GEN9_REPLAY_MODE_MIDOBJECT : GEN9_REPLAY_MODE_MIDBUFFER;
> +
> +   /* enable object level preemption */
> +   brw_load_register_imm32(brw, CS_CHICKEN1,
> +                           replay_mode | GEN9_REPLAY_MODE_MASK);
> +
> +   brw->object_preemption = enable;
> +}
> +
>  static void
>  brw_upload_initial_gpu_state(struct brw_context *brw)
>  {
> @@ -153,6 +175,9 @@ brw_upload_initial_gpu_state(struct brw_context *brw)
>           ADVANCE_BATCH();
>        }
>     }
> +
> +   if (devinfo->gen >= 10)

brw->object_preemption = false;

> +      brw_enable_obj_preemption(brw, true);

To force the LRI despite what the context may believe. (To accommodate
recreating a logical context following a GPU hang.)
-Chris