linux-kernel - Re: [PATCH v8 2/4] drm/panthor: Add driver IOCTL for setting BO labels

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Message-ID: <20250417142647.5d287244@collabora.com>
Date: Thu, 17 Apr 2025 14:26:47 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, kernel@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 2/4] drm/panthor: Add driver IOCTL for setting BO
 labels

On Tue, 15 Apr 2025 20:15:31 +0100
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:

> +/**
> + * struct drm_panthor_bo_set_label - Arguments passed to DRM_IOCTL_PANTHOR_BO_SET_LABEL
> + */
> +struct drm_panthor_bo_set_label {
> +	/** @handle: Handle of the buffer object to label. */
> +	__u32 handle;
> +

Funny that this one pops up just after I fixed a missing-padding-field
issue in panthor_drm.h. We really need to tool based on pahole to
detect those before merging.

TLDR;

	/**  @pad: MBZ. */
	__u32 pad;

> +	/**
> +	 * @label: User pointer to a NUL-terminated string
> +	 *
> +	 * Length cannot be greater than 4096
> +	 */
> +	__u64 label;
> +};
> +
>  /**
>   * DRM_IOCTL_PANTHOR() - Build a Panthor IOCTL number
>   * @__access: Access type. Must be R, W or RW.
> @@ -1019,6 +1037,8 @@ enum {
>  		DRM_IOCTL_PANTHOR(WR, TILER_HEAP_CREATE, tiler_heap_create),
>  	DRM_IOCTL_PANTHOR_TILER_HEAP_DESTROY =
>  		DRM_IOCTL_PANTHOR(WR, TILER_HEAP_DESTROY, tiler_heap_destroy),
> +	DRM_IOCTL_PANTHOR_BO_SET_LABEL =
> +		DRM_IOCTL_PANTHOR(WR, BO_SET_LABEL, bo_set_label),
>  };
>  
>  #if defined(__cplusplus)