Re: [RFC v3 01/12] drm/amdgpu: Introduce reset domain

["Christian König" <ckoenig.leichtzumerken@gmail.com>]

Am 25.01.22 um 23:37 schrieb Andrey Grodzovsky:
> Defined a reset_domain struct such that
> all the entities that go through reset
> together will be serialized one against
> another. Do it for both single device and
> XGMI hive cases.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
> Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> Suggested-by: Christian König <ckoenig.leichtzumerken@gmail.com>
> Reviewed-by: Christian König <christian.koenig@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu.h        |  7 +++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 20 +++++++++++++++++++-
>   drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c   |  9 +++++++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h   |  2 ++
>   4 files changed, 37 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> index 9f017663ac50..b5ff76aae7e0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
> @@ -812,6 +812,11 @@ struct amd_powerplay {
>   
>   #define AMDGPU_RESET_MAGIC_NUM 64
>   #define AMDGPU_MAX_DF_PERFMONS 4
> +
> +struct amdgpu_reset_domain {
> +	struct workqueue_struct *wq;
> +};
> +
>   struct amdgpu_device {
>   	struct device			*dev;
>   	struct pci_dev			*pdev;
> @@ -1096,6 +1101,8 @@ struct amdgpu_device {
>   
>   	struct amdgpu_reset_control     *reset_cntl;
>   	uint32_t                        ip_versions[HW_ID_MAX][HWIP_MAX_INSTANCE];
> +
> +	struct amdgpu_reset_domain	reset_domain;

I'm a bit confused, shouldn't this be a pointer?

Regards,
Christian.

>   };
>   
>   static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 90d22a376632..0f3e6c078f88 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -2391,9 +2391,27 @@ static int amdgpu_device_ip_init(struct amdgpu_device *adev)
>   	if (r)
>   		goto init_failed;
>   
> -	if (adev->gmc.xgmi.num_physical_nodes > 1)
> +	if (adev->gmc.xgmi.num_physical_nodes > 1) {
> +		struct amdgpu_hive_info *hive;
> +
>   		amdgpu_xgmi_add_device(adev);
>   
> +		hive = amdgpu_get_xgmi_hive(adev);
> +		if (!hive || !hive->reset_domain.wq) {
> +			DRM_ERROR("Failed to obtain reset domain info for XGMI hive:%llx", hive->hive_id);
> +			r = -EINVAL;
> +			goto init_failed;
> +		}
> +
> +		adev->reset_domain.wq = hive->reset_domain.wq;
> +	} else {
> +		adev->reset_domain.wq = alloc_ordered_workqueue("amdgpu-reset-dev", 0);
> +		if (!adev->reset_domain.wq) {
> +			r = -ENOMEM;
> +			goto init_failed;
> +		}
> +	}
> +
>   	/* Don't init kfd if whole hive need to be reset during init */
>   	if (!adev->gmc.xgmi.pending_reset)
>   		amdgpu_amdkfd_device_init(adev);
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
> index 567df2db23ac..a858e3457c5c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.c
> @@ -392,6 +392,14 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
>   		goto pro_end;
>   	}
>   
> +	hive->reset_domain.wq = alloc_ordered_workqueue("amdgpu-reset-hive", 0);
> +	if (!hive->reset_domain.wq) {
> +		dev_err(adev->dev, "XGMI: failed allocating wq for reset domain!\n");
> +		kfree(hive);
> +		hive = NULL;
> +		goto pro_end;
> +	}
> +
>   	hive->hive_id = adev->gmc.xgmi.hive_id;
>   	INIT_LIST_HEAD(&hive->device_list);
>   	INIT_LIST_HEAD(&hive->node);
> @@ -401,6 +409,7 @@ struct amdgpu_hive_info *amdgpu_get_xgmi_hive(struct amdgpu_device *adev)
>   	task_barrier_init(&hive->tb);
>   	hive->pstate = AMDGPU_XGMI_PSTATE_UNKNOWN;
>   	hive->hi_req_gpu = NULL;
> +
>   	/*
>   	 * hive pstate on boot is high in vega20 so we have to go to low
>   	 * pstate on after boot.
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
> index d2189bf7d428..6121aaa292cb 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_xgmi.h
> @@ -42,6 +42,8 @@ struct amdgpu_hive_info {
>   		AMDGPU_XGMI_PSTATE_MAX_VEGA20,
>   		AMDGPU_XGMI_PSTATE_UNKNOWN
>   	} pstate;
> +
> +	struct amdgpu_reset_domain reset_domain;
>   };
>   
>   struct amdgpu_pcs_ras_field {