linux-kernel - [PATCH RFC 07/15] drm/vkms: Introduce plane name configuration

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Message-ID: <20240905123413.3127-1-jose.exposito89@gmail.com>
Date: Thu,  5 Sep 2024 14:34:13 +0200
From: José Expósito <jose.exposito89@...il.com>
To: louis.chauvet@...tlin.com
Cc: airlied@...il.com,
	arthurgrillo@...eup.net,
	daniel@...ll.ch,
	dri-devel@...ts.freedesktop.org,
	hamohammed.sa@...il.com,
	jeremie.dautheribes@...tlin.com,
	linux-kernel@...r.kernel.org,
	maarten.lankhorst@...ux.intel.com,
	mairacanal@...eup.net,
	melissa.srw@...il.com,
	miquel.raynal@...tlin.com,
	mripard@...nel.org,
	nicolejadeyee@...gle.com,
	rodrigosiqueiramelo@...il.com,
	seanpaul@...gle.com,
	thomas.petazzoni@...tlin.com,
	tzimmermann@...e.de
Subject: [PATCH RFC 07/15] drm/vkms: Introduce plane name configuration

> As a plane will be a folder in ConfigFS, add name configuration for plane
> so it will reflect the folder name.
> 
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
>  drivers/gpu/drm/vkms/vkms_config.c | 14 ++++++++++++++
>  drivers/gpu/drm/vkms/vkms_config.h |  2 ++
>  drivers/gpu/drm/vkms/vkms_plane.c  |  2 +-
>  3 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c
> index b1c6160d350f..b8e235a22e90 100644
> --- a/drivers/gpu/drm/vkms/vkms_config.c
> +++ b/drivers/gpu/drm/vkms/vkms_config.c
> @@ -34,6 +34,10 @@ struct vkms_config *vkms_config_alloc_default(bool enable_writeback, bool enable
>  		goto err_alloc;
>  
>  	plane->type = DRM_PLANE_TYPE_PRIMARY;
> +	plane->name = kzalloc(sizeof("primary"), GFP_KERNEL);
> +	if (!plane->name)
> +		goto err_alloc;
> +	sprintf(plane->name, "primary");

I think that, since all planes will have a name, you could make the
name a function param and kmemdup() it in vkms_config_create_plane().

The same could apply for CRTCs and encoders in patches 13 and 14.
>  
>  	if (enable_overlay) {
>  		for (int i = 0; i < NUM_OVERLAY_PLANES; i++) {
> @@ -41,6 +45,10 @@ struct vkms_config *vkms_config_alloc_default(bool enable_writeback, bool enable
>  			if (!plane)
>  				goto err_alloc;
>  			plane->type = DRM_PLANE_TYPE_OVERLAY;
> +			plane->name = kzalloc(10, GFP_KERNEL);
> +			if (!plane->name)
> +				goto err_alloc;
> +			snprintf(plane->name, 10, "plane-%d", i);
>  		}
>  	}
>  	if (enable_cursor) {
> @@ -48,6 +56,10 @@ struct vkms_config *vkms_config_alloc_default(bool enable_writeback, bool enable
>  		if (!plane)
>  			goto err_alloc;
>  		plane->type = DRM_PLANE_TYPE_CURSOR;
> +		plane->name = kzalloc(sizeof("cursor"), GFP_KERNEL);
> +		if (!plane->name)
> +			goto err_alloc;
> +		sprintf(plane->name, "cursor");
>  	}
>  
>  	return vkms_config;
> @@ -79,6 +91,7 @@ void vkms_config_delete_plane(struct vkms_config_plane *vkms_config_overlay)
>  	if (!vkms_config_overlay)
>  		return;
>  	list_del(&vkms_config_overlay->link);
> +	kfree(vkms_config_overlay->name);
>  	kfree(vkms_config_overlay);
>  }
>  
> @@ -131,6 +144,7 @@ static int vkms_config_show(struct seq_file *m, void *data)
>  	seq_printf(m, "writeback=%d\n", vkmsdev->config->writeback);
>  	list_for_each_entry(config_plane, &vkmsdev->config->planes, link) {
>  		seq_puts(m, "plane:\n");
> +		seq_printf(m, "\tname: %s\n", config_plane->name);
>  		seq_printf(m, "\ttype: %d\n", config_plane->type);
>  	}
>  
> diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h
> index 77c1c3934189..792c5e904aa1 100644
> --- a/drivers/gpu/drm/vkms/vkms_config.h
> +++ b/drivers/gpu/drm/vkms/vkms_config.h
> @@ -25,6 +25,7 @@ struct vkms_config {
>   * struct vkms_config_plane
>   *
>   * @link: Link to the others planes
> + * @name: Name of the plane
>   * @type: Type of the plane. The creator of configuration needs to ensures that at least one
>   *        plane is primary.
>   * @plane: Internal usage. This pointer should never be considered as valid. It can be used to
> @@ -34,6 +35,7 @@ struct vkms_config {
>  struct vkms_config_plane {
>  	struct list_head link;
>  
> +	char *name;
>  	enum drm_plane_type type;
>  
>  	/* Internal usage */
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index dc9bccf60071..d2b1b524499f 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -231,7 +231,7 @@ struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
>  	plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 0,
>  					   &vkms_plane_funcs,
>  					   vkms_formats, ARRAY_SIZE(vkms_formats),
> -					   NULL, config->type, NULL);
> +					   NULL, config->type, config->name);
>  	if (IS_ERR(plane))
>  		return plane;
>  
>