[PATCH] drm/amdkfd: Load mqd to hqd in non-HWS mode

[Alex Deucher]

On Sun, Jan 4, 2015 at 2:53 PM, Oded Gabbay <oded.gabbay at amd.com> wrote:
> From: Ben Goz <ben.goz at amd.com>
>
> This patch fixes a bug in DQM, where the MQD of a newly created compute queue
> is not loaded to an HQD slot. As a result, the CP never reads packets from this
> queue.
>
> This bug happens only in non-HWS (hardware scheduling) mode. In HWS mode, the
> CP is responsible of loading MQDs to HQDs slots.
>
> Signed-off-by: Ben Goz <ben.goz at amd.com>
> Reviewed-by: Oded Gabbay <oded.gabbay at amd.com>

Acked-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index f44d673..3b08ed6 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -272,6 +272,18 @@ static int create_compute_queue_nocpsch(struct device_queue_manager *dqm,
>                 return retval;
>         }
>
> +       pr_debug("kfd: loading mqd to hqd on pipe (%d) queue (%d)\n",
> +                       q->pipe,
> +                       q->queue);
> +
> +       retval = mqd->load_mqd(mqd, q->mqd, q->pipe,
> +                       q->queue, q->properties.write_ptr);
> +       if (retval != 0) {
> +               deallocate_hqd(dqm, q);
> +               mqd->uninit_mqd(mqd, q->mqd, q->mqd_mem_obj);
> +               return retval;
> +       }
> +
>         return 0;
>  }
>
> --
> 2.1.0
>
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