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Message-ID: <5c77c4eaff1dc746243118cd9130299ba1dd2136@intel.com>
Date: Mon, 27 Oct 2025 12:15:29 +0200
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Louis Chauvet <louis.chauvet@...tlin.com>, Haneen Mohammed
<hamohammed.sa@...il.com>, Simona Vetter <simona@...ll.ch>, Melissa Wen
<melissa.srw@...il.com>, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
jose.exposito89@...il.com, Jonathan Corbet <corbet@....net>
Cc: victoria@...tem76.com, sebastian.wick@...hat.com, victoria@...tem76.com,
airlied@...il.com, thomas.petazzoni@...tlin.com,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: Re: [PATCH 01/22] drm/vkms: Introduce config for plane name
On Sat, 18 Oct 2025, Louis Chauvet <louis.chauvet@...tlin.com> wrote:
> As planes can have a name in DRM, prepare VKMS to configure it using
> ConfigFS.
>
> Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
> ---
> drivers/gpu/drm/vkms/vkms_config.c | 4 ++++
> drivers/gpu/drm/vkms/vkms_config.h | 26 ++++++++++++++++++++++++++
> drivers/gpu/drm/vkms/vkms_drv.h | 5 +++--
> drivers/gpu/drm/vkms/vkms_output.c | 6 +-----
> drivers/gpu/drm/vkms/vkms_plane.c | 6 ++++--
> 5 files changed, 38 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_config.c b/drivers/gpu/drm/vkms/vkms_config.c
> index f8394a063ecf..ed172f800685 100644
> --- a/drivers/gpu/drm/vkms/vkms_config.c
> +++ b/drivers/gpu/drm/vkms/vkms_config.c
> @@ -350,6 +350,8 @@ static int vkms_config_show(struct seq_file *m, void *data)
> seq_puts(m, "plane:\n");
> seq_printf(m, "\ttype=%d\n",
> vkms_config_plane_get_type(plane_cfg));
> + seq_printf(m, "\tname=%s\n",
> + vkms_config_plane_get_name(plane_cfg));
> }
>
> vkms_config_for_each_crtc(vkmsdev->config, crtc_cfg) {
> @@ -390,6 +392,7 @@ struct vkms_config_plane *vkms_config_create_plane(struct vkms_config *config)
>
> plane_cfg->config = config;
> vkms_config_plane_set_type(plane_cfg, DRM_PLANE_TYPE_OVERLAY);
> + vkms_config_plane_set_name(plane_cfg, NULL);
> xa_init_flags(&plane_cfg->possible_crtcs, XA_FLAGS_ALLOC);
>
> list_add_tail(&plane_cfg->link, &config->planes);
> @@ -402,6 +405,7 @@ void vkms_config_destroy_plane(struct vkms_config_plane *plane_cfg)
> {
> xa_destroy(&plane_cfg->possible_crtcs);
> list_del(&plane_cfg->link);
> + kfree_const(plane_cfg->name);
> kfree(plane_cfg);
> }
> EXPORT_SYMBOL_IF_KUNIT(vkms_config_destroy_plane);
> diff --git a/drivers/gpu/drm/vkms/vkms_config.h b/drivers/gpu/drm/vkms/vkms_config.h
> index 4c8d668e7ef8..b69c35097ba0 100644
> --- a/drivers/gpu/drm/vkms/vkms_config.h
> +++ b/drivers/gpu/drm/vkms/vkms_config.h
> @@ -35,6 +35,7 @@ struct vkms_config {
> *
> * @link: Link to the others planes in vkms_config
> * @config: The vkms_config this plane belongs to
> + * @name: Name of the plane
> * @type: Type of the plane. The creator of configuration needs to ensures that
> * at least one primary plane is present.
> * @possible_crtcs: Array of CRTCs that can be used with this plane
> @@ -47,6 +48,7 @@ struct vkms_config_plane {
> struct list_head link;
> struct vkms_config *config;
>
> + const char *name;
> enum drm_plane_type type;
> struct xarray possible_crtcs;
>
> @@ -288,6 +290,30 @@ vkms_config_plane_set_type(struct vkms_config_plane *plane_cfg,
> plane_cfg->type = type;
> }
>
> +/**
> + * vkms_config_plane_set_name() - Set the plane name
> + * @plane_cfg: Plane to set the name to
> + * @name: New plane name. The name is copied.
> + */
> +static inline void
> +vkms_config_plane_set_name(struct vkms_config_plane *plane_cfg,
> + const char *name)
> +{
> + if (plane_cfg->name)
> + kfree_const(plane_cfg->name);
> + plane_cfg->name = kstrdup_const(name, GFP_KERNEL);
> +}
> +
> +/**
> + * vkms_config_plane_get_name - Get the plane name
> + * @plane_cfg: Plane to get the name from
> + */
> +static inline const char *
> +vkms_config_plane_get_name(struct vkms_config_plane *plane_cfg)
> +{
> + return plane_cfg->name;
> +}
What's with the abundance of static inlines being added in this header?
You'll have more files including this header, and this header will be
including more files the more static inline functionality you add, and
eventually everything just ends up including way too much. That's what
happens with static inlines, and it's a bunch of tedious refactoring
later to clean it up.
BR,
Jani.
> +
> /**
> * vkms_config_plane_attach_crtc - Attach a plane to a CRTC
> * @plane_cfg: Plane to attach
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index db260df1d4f6..9ad286f043b5 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -225,6 +225,7 @@ struct vkms_output {
> };
>
> struct vkms_config;
> +struct vkms_config_plane;
>
> /**
> * struct vkms_device - Description of a VKMS device
> @@ -298,10 +299,10 @@ int vkms_output_init(struct vkms_device *vkmsdev);
> * vkms_plane_init() - Initialize a plane
> *
> * @vkmsdev: VKMS device containing the plane
> - * @type: type of plane to initialize
> + * @config: plane configuration
> */
> struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> - enum drm_plane_type type);
> + struct vkms_config_plane *config);
>
> /* CRC Support */
> const char *const *vkms_get_crc_sources(struct drm_crtc *crtc,
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index 2ee3749e2b28..22208d02afa4 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -19,11 +19,7 @@ int vkms_output_init(struct vkms_device *vkmsdev)
> return -EINVAL;
>
> vkms_config_for_each_plane(vkmsdev->config, plane_cfg) {
> - enum drm_plane_type type;
> -
> - type = vkms_config_plane_get_type(plane_cfg);
> -
> - plane_cfg->plane = vkms_plane_init(vkmsdev, type);
> + plane_cfg->plane = vkms_plane_init(vkmsdev, plane_cfg);
> if (IS_ERR(plane_cfg->plane)) {
> DRM_DEV_ERROR(dev->dev, "Failed to init vkms plane\n");
> return PTR_ERR(plane_cfg->plane);
> diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
> index e592e47a5736..263376686794 100644
> --- a/drivers/gpu/drm/vkms/vkms_plane.c
> +++ b/drivers/gpu/drm/vkms/vkms_plane.c
> @@ -11,6 +11,7 @@
>
> #include "vkms_drv.h"
> #include "vkms_formats.h"
> +#include "vkms_config.h"
>
> static const u32 vkms_formats[] = {
> DRM_FORMAT_ARGB8888,
> @@ -217,7 +218,7 @@ static const struct drm_plane_helper_funcs vkms_plane_helper_funcs = {
> };
>
> struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> - enum drm_plane_type type)
> + struct vkms_config_plane *config)
> {
> struct drm_device *dev = &vkmsdev->drm;
> struct vkms_plane *plane;
> @@ -225,7 +226,8 @@ 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, type, NULL);
> + NULL, vkms_config_plane_get_type(config),
> + vkms_config_plane_get_name(config));
> if (IS_ERR(plane))
> return plane;
--
Jani Nikula, Intel
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