[PATCH] drm/amd/amdkfd: Don't sent command to HWS on kfd reset

[Felix Kuehling]

Am 2021-11-04 um 12:53 p.m. schrieb shaoyunl:
> When kfd need to be reset, sent command to HWS might cause hang and get unnecessary timeout.
> This change try not to touch HW in pre_reset and keep queues to be in the evicted state
> when the reset is done, so they are not put back on the runlist. These queues will be destroied
> on process termination.
>
> Signed-off-by: shaoyunl <shaoyun.liu at amd.com>

Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>


> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 2 +-
>  drivers/gpu/drm/amd/amdkfd/kfd_process.c              | 6 +++++-
>  2 files changed, 6 insertions(+), 2 deletions(-)
>
> 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 e9601d4dfb77..0a60317509c8 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -1430,7 +1430,7 @@ static int unmap_queues_cpsch(struct device_queue_manager *dqm,
>  
>  	if (!dqm->sched_running)
>  		return 0;
> -	if (dqm->is_hws_hang)
> +	if (dqm->is_hws_hang || dqm->is_resetting)
>  		return -EIO;
>  	if (!dqm->active_runlist)
>  		return retval;
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index f8a8fdb95832..f29b3932e3dc 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> @@ -1715,7 +1715,11 @@ int kfd_process_evict_queues(struct kfd_process *p)
>  
>  		r = pdd->dev->dqm->ops.evict_process_queues(pdd->dev->dqm,
>  							    &pdd->qpd);
> -		if (r) {
> +		/* evict return -EIO if HWS is hang or asic is resetting, in this case
> +		 * we would like to set all the queues to be in evicted state to prevent
> +		 * them been add back since they actually not be saved right now.
> +		 */
> +		if (r && r != -EIO) {
>  			pr_err("Failed to evict process queues\n");
>  			goto fail;
>  		}