Re: [PATCH v2 3/4] drm/v3d: add generic ioctl extension

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On Wed, 2021-09-29 at 10:44 +0100, Melissa Wen wrote:
> Add support to attach generic extensions on job submission. This
> patch
> is third prep work to enable multiple syncobjs on job submission.
> With
> this work, when the job submission interface needs to be extended to
> accomodate a new feature, we will use a generic extension struct
> where
> an id determines the data type to be pointed. The first application
> is
> to enable multiples in/out syncobj (next patch), but the base is
> already done for future features. Therefore, to attach a new feature,
> a specific extension struct should subclass drm_v3d_extension and
> update the list of extensions in a job submission.
> 
> v2:
> - remove redundant elements to subclass struct (Daniel)
> 
> Signed-off-by: Melissa Wen <mwen@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/v3d/v3d_drv.c |  4 +-
>  drivers/gpu/drm/v3d/v3d_gem.c | 71
> +++++++++++++++++++++++++++++++++--
>  include/uapi/drm/v3d_drm.h    | 31 +++++++++++++++
>  3 files changed, 100 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.c
> b/drivers/gpu/drm/v3d/v3d_drv.c
> index c1deab2cf38d..3d6b9bcce2f7 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.c
> +++ b/drivers/gpu/drm/v3d/v3d_drv.c
> @@ -83,7 +83,6 @@ static int v3d_get_param_ioctl(struct drm_device
> *dev, void *data,
>  		return 0;
>  	}
>  
> -
>  	switch (args->param) {
>  	case DRM_V3D_PARAM_SUPPORTS_TFU:
>  		args->value = 1;
> @@ -147,7 +146,7 @@ v3d_postclose(struct drm_device *dev, struct
> drm_file *file)
>  DEFINE_DRM_GEM_FOPS(v3d_drm_fops);
>  
>  /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have
> GMP
> - * protection between clients.  Note that render nodes would be be
> + * protection between clients.  Note that render nodes would be
>   * able to submit CLs that could access BOs from clients
> authenticated
>   * with the master node.  The TFU doesn't use the GMP, so it would
>   * need to stay DRM_AUTH until we do buffer size/offset validation.
> @@ -219,7 +218,6 @@ static int v3d_platform_drm_probe(struct
> platform_device *pdev)
>  	u32 mmu_debug;
>  	u32 ident1;
>  
> -
>  	v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev,
> drm);
>  	if (IS_ERR(v3d))
>  		return PTR_ERR(v3d);
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c
> b/drivers/gpu/drm/v3d/v3d_gem.c
> index 9cfa6f8d4357..b912419027f7 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -535,6 +535,33 @@ v3d_attach_fences_and_unlock_reservation(struct
> drm_file *file_priv,
>  	}
>  }
>  
> +static int
> +v3d_get_extensions(struct drm_file *file_priv, u64 ext_handles)
> +{
> +	struct drm_v3d_extension __user *user_ext;
> +
> +	user_ext = u64_to_user_ptr(ext_handles);
> +	while(user_ext) {
> +		struct drm_v3d_extension ext;
> +
> +		if (copy_from_user(&ext, user_ext, sizeof(ext))) {
> +			DRM_DEBUG("Failed to copy submit extension\n");
> +			return -EFAULT;
> +		}
> +
> +		switch (ext.id) {
> +		case 0:
> +		default:
> +			DRM_DEBUG_DRIVER("Unknown extension id: %d\n",
> ext.id);
> +			return -EINVAL;
> +		}
> +
> +		user_ext = u64_to_user_ptr(ext.next);
> +	}
> +
> +	return 0;
> +}
> +
>  /**
>   * v3d_submit_cl_ioctl() - Submits a job (frame) to the V3D.
>   * @dev: DRM device
> @@ -563,15 +590,24 @@ v3d_submit_cl_ioctl(struct drm_device *dev,
> void *data,
>  
>  	trace_v3d_submit_cl_ioctl(&v3d->drm, args->rcl_start, args-
> >rcl_end);
>  
> -	if (args->pad != 0)
> +	if (args->pad)
>  		return -EINVAL;
>  
> -	if (args->flags != 0 &&
> -	    args->flags != DRM_V3D_SUBMIT_CL_FLUSH_CACHE) {
> +	if (args->flags &&
> +	    args->flags & ~(DRM_V3D_SUBMIT_CL_FLUSH_CACHE |
> +			    DRM_V3D_SUBMIT_EXTENSION)) {
>  		DRM_INFO("invalid flags: %d\n", args->flags);
>  		return -EINVAL;
>  	}
>  
> +	if (args->flags & DRM_V3D_SUBMIT_EXTENSION) {
> +		ret = v3d_get_extensions(file_priv, args->extensions);
> +		if (ret) {
> +			DRM_DEBUG("Failed to get extensions.\n");
> +			return ret;
> +		}
> +	}
> +
>  	ret = v3d_job_init(v3d, file_priv, (void *)&render,
> sizeof(*render),
>  			   v3d_render_job_free, args->in_sync_bcl,
> V3D_RENDER);
>  	if (ret)
> @@ -700,6 +736,19 @@ v3d_submit_tfu_ioctl(struct drm_device *dev,
> void *data,
>  
>  	trace_v3d_submit_tfu_ioctl(&v3d->drm, args->iia);
>  
> +	if (args->flags && !(args->flags & DRM_V3D_SUBMIT_EXTENSION)) {
> +		DRM_DEBUG("invalid flags: %d\n", args->flags);
> +		return -EINVAL;
> +	}
> +
> +	if (args->flags & DRM_V3D_SUBMIT_EXTENSION) {
> +		ret = v3d_get_extensions(file_priv, args->extensions);
> +		if (ret) {
> +			DRM_DEBUG("Failed to get extensions.\n");
> +			return ret;
> +		}
> +	}
> +
>  	ret = v3d_job_init(v3d, file_priv, (void *)&job, sizeof(*job),
>  			   v3d_job_free, args->in_sync, V3D_TFU);
>  	if (ret)
> @@ -784,11 +833,27 @@ v3d_submit_csd_ioctl(struct drm_device *dev,
> void *data,
>  
>  	trace_v3d_submit_csd_ioctl(&v3d->drm, args->cfg[5], args-
> >cfg[6]);
>  
> +	if (args->pad)
> +		return -EINVAL;
> +
>  	if (!v3d_has_csd(v3d)) {
>  		DRM_DEBUG("Attempting CSD submit on non-CSD
> hardware\n");
>  		return -EINVAL;
>  	}
>  
> +	if (args->flags && !(args->flags & DRM_V3D_SUBMIT_EXTENSION)) {
> +		DRM_INFO("invalid flags: %d\n", args->flags);
> +		return -EINVAL;
> +	}
> +
> +	if (args->flags & DRM_V3D_SUBMIT_EXTENSION) {
> +		ret = v3d_get_extensions(file_priv, args->extensions);
> +		if (ret) {
> +			DRM_DEBUG("Failed to get extensions.\n");
> +			return ret;
> +		}
> +	}
> +
>  	ret = v3d_job_init(v3d, file_priv, (void *)&job, sizeof(*job),
>  			   v3d_job_free, args->in_sync, V3D_CSD);
>  	if (ret)
> diff --git a/include/uapi/drm/v3d_drm.h b/include/uapi/drm/v3d_drm.h
> index 4104f22fb3d3..55b443ca6c0b 100644
> --- a/include/uapi/drm/v3d_drm.h
> +++ b/include/uapi/drm/v3d_drm.h
> @@ -58,6 +58,20 @@ extern "C" {
>  						   struct
> drm_v3d_perfmon_get_values)
>  
>  #define DRM_V3D_SUBMIT_CL_FLUSH_CACHE             0x01
> +#define DRM_V3D_SUBMIT_EXTENSION		  0x02
> +
> +/* struct drm_v3d_extension - ioctl extensions
> + *
> + * Linked-list of generic extensions where the id identify which
> struct is
> + * pointed by ext_data. Therefore, DRM_V3D_EXT_ID_* is used on id to
> identify
> + * the extension type.
> + */
> +struct drm_v3d_extension {
> +	__u64 next;
> +	__u32 id;
> +#define DRM_V3D_EXT_ID_MULTI_SYNC		0x01
> +	__u32 flags; /* mbz */
> +};
>  
>  /**
>   * struct drm_v3d_submit_cl - ioctl argument for submitting commands
> to the 3D
> @@ -135,12 +149,16 @@ struct drm_v3d_submit_cl {
>  	/* Number of BO handles passed in (size is that times 4). */
>  	__u32 bo_handle_count;
>  
> +	/* DRM_V3D_SUBMIT_* properties */
>  	__u32 flags;
>  
>  	/* ID of the perfmon to attach to this job. 0 means no perfmon.
> */
>  	__u32 perfmon_id;
>  
>  	__u32 pad;
> +
> +	/* Pointer to an array of ioctl extensions*/
> +	__u64 extensions;
>  };
>  
>  /**
> @@ -248,6 +266,12 @@ struct drm_v3d_submit_tfu {
>  	__u32 in_sync;
>  	/* Sync object to signal when the TFU job is done. */
>  	__u32 out_sync;
> +
> +	__u32 flags;
> +
> +	/* Pointer to an array of ioctl extensions*/
> +	__u64 extensions;

We want __u64 fields aligned to 64-bit so we should swap the positions
of flags and extensions.

> +
>  };
>  
>  /* Submits a compute shader for dispatch.  This job will block on
> any
> @@ -276,6 +300,13 @@ struct drm_v3d_submit_csd {
>  
>  	/* ID of the perfmon to attach to this job. 0 means no perfmon.
> */
>  	__u32 perfmon_id;
> +
> +	/* Pointer to an array of ioctl extensions*/
> +	__u64 extensions;
> +
> +	__u32 flags;
> +
> +	__u32 pad;
>  };
>  
>  enum {




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