linux-kernel - Re: [PATCH v2 1/5] drm: panthor: expose some fw information through the query ioctl

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Message-ID: <20240814153753.58e96597@collabora.com>
Date: Wed, 14 Aug 2024 15:44:47 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Daniel Almeida <daniel.almeida@...labora.com>
Cc: liviu.dudau@....com, steven.price@....com, carsten.haitzler@....com,
 robh@...nel.org, faith.ekstrand@...labora.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] drm: panthor: expose some fw information through
 the query ioctl

On Tue, 13 Aug 2024 18:05:44 -0300
Daniel Almeida <daniel.almeida@...labora.com> wrote:

> This is of interest to userspace, and similar in nature to the GPU
> and CSIF information we already return in the query ioctl.
> 
> Signed-off-by: Daniel Almeida <daniel.almeida@...labora.com>
> ---
>  drivers/gpu/drm/panthor/panthor_device.h |  3 +++
>  drivers/gpu/drm/panthor/panthor_drv.c    |  8 ++++++++
>  drivers/gpu/drm/panthor/panthor_sched.c  |  5 +++++
>  include/uapi/drm/panthor_drm.h           | 19 +++++++++++++++++++
>  4 files changed, 35 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> index e388c0472ba7..224c53dcfe6d 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.h
> +++ b/drivers/gpu/drm/panthor/panthor_device.h
> @@ -100,6 +100,9 @@ struct panthor_device {
>  	/** @csif_info: Command stream interface information. */
>  	struct drm_panthor_csif_info csif_info;
>  
> +	/** @fw_info: Firmware info for the global interface */
> +	struct drm_panthor_fw_info fw_info;
> +
>  	/** @gpu: GPU management data. */
>  	struct panthor_gpu *gpu;
>  
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index b8a84f26b3ef..fb30e119d9bf 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -164,6 +164,7 @@ panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
>  	_Generic(_obj_name, \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_gpu_info, tiler_present), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_csif_info, pad), \
> +		 PANTHOR_UOBJ_DECL(struct drm_panthor_fw_info, instr_features), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_sync_op, timeline_value), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_queue_submit, syncs), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_queue_create, ringbuf_size), \
> @@ -765,6 +766,10 @@ static int panthor_ioctl_dev_query(struct drm_device *ddev, void *data, struct d
>  			args->size = sizeof(ptdev->csif_info);
>  			return 0;
>  
> +		case DRM_PANTHOR_DEV_QUERY_FW_INFO:
> +			args->size = sizeof(ptdev->fw_info);
> +			return 0;
> +
>  		default:
>  			return -EINVAL;
>  		}
> @@ -777,6 +782,9 @@ static int panthor_ioctl_dev_query(struct drm_device *ddev, void *data, struct d
>  	case DRM_PANTHOR_DEV_QUERY_CSIF_INFO:
>  		return PANTHOR_UOBJ_SET(args->pointer, args->size, ptdev->csif_info);
>  
> +	case DRM_PANTHOR_DEV_QUERY_FW_INFO:
> +		return PANTHOR_UOBJ_SET(args->pointer, args->size, ptdev->fw_info);
> +
>  	default:
>  		return -EINVAL;
>  	}
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 79ffcbc41d78..e0ecc8bcfaae 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -3495,6 +3495,11 @@ int panthor_sched_init(struct panthor_device *ptdev)
>  	ptdev->csif_info.cs_slot_count = sched->cs_slot_count;
>  	ptdev->csif_info.scoreboard_slot_count = sched->sb_slot_count;
>  
> +	ptdev->fw_info.version = glb_iface->control->version;
> +	ptdev->fw_info.features = glb_iface->control->features;
> +	ptdev->fw_info.group_num = glb_iface->control->group_num;
> +	ptdev->fw_info.instr_features = glb_iface->control->instr_features;
> +
>  	sched->last_tick = 0;
>  	sched->resched_target = U64_MAX;
>  	sched->tick_period = msecs_to_jiffies(10);
> diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
> index aaed8e12ad0b..e235cf452460 100644
> --- a/include/uapi/drm/panthor_drm.h
> +++ b/include/uapi/drm/panthor_drm.h
> @@ -260,6 +260,9 @@ enum drm_panthor_dev_query_type {
>  
>  	/** @DRM_PANTHOR_DEV_QUERY_CSIF_INFO: Query command-stream interface information. */
>  	DRM_PANTHOR_DEV_QUERY_CSIF_INFO,
> +
> +	/** @DRM_PANTHOR_DEV_QUERY_FW_INFO: Query firmware information */
> +	DRM_PANTHOR_DEV_QUERY_FW_INFO,
>  };
>  
>  /**
> @@ -377,6 +380,22 @@ struct drm_panthor_csif_info {
>  	__u32 pad;
>  };
>  
> +/** struct drm_panthor_fw_info - FW information
> + *
> + * Structure grouping all queryable information relating to the global FW interface.

nit: I think we shouldn't restrict to global interface information if
we see something in the group/queue that's worth exposing (number of
streams/queues per group, group features, ...), so I would suggest being
less specific in here:

    Structure grouping all queryable information relating to the FW.


> + */
> +
> +struct drm_panthor_fw_info {
> +	/** @version: Global interface version */
> +	__u32 version;
> +	/** @features: Global interface features */
> +	__u32 features;
> +	/** @group_num: Number of CSG interfaces */
> +	__u32 group_num;
> +	/** @instr_features: Instrumentation features */
> +	__u32 instr_features;
> +};
> +
>  /**
>   * struct drm_panthor_dev_query - Arguments passed to DRM_PANTHOR_IOCTL_DEV_QUERY
>   */