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Date: Wed, 23 Aug 2023 18:31:56 +0300
From: Marius Vlad <marius.vlad@...labora.com>
To: Brandon Pollack <brpol@...omium.org>, jshargo@...omium.org
Cc: corbet@....net, dri-devel@...ts.freedesktop.org,
hamohammed.sa@...il.com, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, mairacanal@...eup.net,
melissa.srw@...il.com, mripard@...nel.org,
rodrigosiqueiramelo@...il.com, tzimmermann@...e.de,
airlied@...il.com, daniel@...ll.ch,
maarten.lankhorst@...ux.intel.com, mduggan@...omium.org,
hirono@...omium.org
Subject: Re: [PATCH v3 4/7] drm/vkms: Add ConfigFS scaffolding to VKMS
Hi Brandon,
On 8/18/23 10:43, Brandon Pollack wrote:
> From: Jim Shargo <jshargo@...omium.org>
>
> This change adds the basic scaffolding for ConfigFS, including setting
> up the default directories. It does not allow for the registration of
> configfs-backed devices, which is complex and provided in a follow-up
> commit.
>
> This CL includes docs about using ConfigFS with VKMS, but I'll summarize
> in brief here as well (assuming ConfigFS is mounted at /config/):
>
> To create a new device, you can do so via `mkdir
> /config/vkms/my-device`.
>
> This will create a number of directories and files automatically:
>
> /config
> `-- vkms
> `-- my-device
> |-- connectors
> |-- crtcs
> |-- encoders
> |-- planes
> `-- enabled
>
> You can then configure objects by mkdir'ing in each of the directories.
>
> When you're satisfied, you can `echo 1 > /config/vkms/my-device/enabled`.
> This will create a new device according to your configuration.
>
> For now, this will fail, but the next change will add support for it.
>
> Signed-off-by: Jim Shargo <jshargo@...omium.org>
> Signed-off-by: Brandon Pollack <brpol@...omium.org>
> ---
> Documentation/gpu/vkms.rst | 18 +-
> drivers/gpu/drm/Kconfig | 1 +
> drivers/gpu/drm/vkms/Makefile | 1 +
> drivers/gpu/drm/vkms/vkms_configfs.c | 651 +++++++++++++++++++++++++++
> drivers/gpu/drm/vkms/vkms_drv.c | 56 ++-
> drivers/gpu/drm/vkms/vkms_drv.h | 92 +++-
> drivers/gpu/drm/vkms/vkms_output.c | 5 +
> 7 files changed, 807 insertions(+), 17 deletions(-)
> create mode 100644 drivers/gpu/drm/vkms/vkms_configfs.c
>
> diff --git a/Documentation/gpu/vkms.rst b/Documentation/gpu/vkms.rst
> index ba04ac7c2167..c3875bf66dba 100644
> --- a/Documentation/gpu/vkms.rst
> +++ b/Documentation/gpu/vkms.rst
> @@ -51,6 +51,12 @@ To disable the driver, use ::
>
> sudo modprobe -r vkms
>
> +Configuration With ConfigFS
> +===========================
> +
> +.. kernel-doc:: drivers/gpu/drm/vkms/vkms_configfs.c
> + :doc: ConfigFS Support for VKMS
> +
> Testing With IGT
> ================
>
> @@ -135,22 +141,16 @@ project.
> Runtime Configuration
> ---------------------
>
> -We want to be able to reconfigure vkms instance without having to reload the
> -module. Use/Test-cases:
> +We want to be able to manipulate vkms instances without having to reload the
> +module. Such configuration can be added as extensions to vkms's ConfigFS
> +support. Use-cases:
>
> - Hotplug/hotremove connectors on the fly (to be able to test DP MST handling
> of compositors).
>
> -- Configure planes/crtcs/connectors (we'd need some code to have more than 1 of
> - them first).
> -
> - Change output configuration: Plug/unplug screens, change EDID, allow changing
> the refresh rate.
>
> -The currently proposed solution is to expose vkms configuration through
> -configfs. All existing module options should be supported through configfs
> -too.
> -
> Writeback support
> -----------------
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index ab9ef1c20349..e39ee0e8ca06 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -284,6 +284,7 @@ config DRM_VKMS
> depends on DRM && MMU
> select DRM_KMS_HELPER
> select DRM_GEM_SHMEM_HELPER
> + select CONFIGFS_FS
> select CRC32
> default n
> help
> diff --git a/drivers/gpu/drm/vkms/Makefile b/drivers/gpu/drm/vkms/Makefile
> index 1b28a6a32948..6b83907ad554 100644
> --- a/drivers/gpu/drm/vkms/Makefile
> +++ b/drivers/gpu/drm/vkms/Makefile
> @@ -1,5 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0-only
> vkms-y := \
> + vkms_configfs.o \
> vkms_drv.o \
> vkms_plane.o \
> vkms_output.o \
> diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c
> new file mode 100644
> index 000000000000..72723427a1ac
> --- /dev/null
> +++ b/drivers/gpu/drm/vkms/vkms_configfs.c
> @@ -0,0 +1,651 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +
> +#include <linux/configfs.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +
> +#include <drm/drm_plane.h>
> +#include <drm/drm_print.h>
> +
> +#include "vkms_drv.h"
> +
> +/**
> + * DOC: ConfigFS Support for VKMS
> + *
> + * VKMS is instrumented with support for configuration via :doc:`ConfigFS
> + * <../filesystems/configfs>`.
> + *
> + * With VKMS installed, you can mount ConfigFS at ``/config/`` like so::
> + *
> + * mkdir -p /config/
> + * sudo mount -t configfs none /config
> + *
> + * This allows you to configure multiple virtual devices. Note
> + * that the default device which can be enabled in the module params with::
> + *
> + * modprobe vkms default_device=1
> + *
> + * is immutable because we cannot pre-populate ConfigFS directories with normal
> + * files.
> + *
> + * To set up a new device, create a new directory under the VKMS configfs
> + * directory::
> + *
> + * mkdir /config/vkms/test
> + *
> + * With your device created you'll find an new directory ready to be
> + * configured::
> + *
> + * /config
> + * `-- vkms
> + * `-- test
> + * |-- connectors
> + * |-- crtcs
> + * |-- encoders
> + * |-- planes
> + * `-- enabled
> + *
> + * Each directory you add within the connectors, crtcs, encoders, and planes
> + * directories will let you configure a new object of that type. Adding new
> + * objects will automatically create a set of default files and folders you can
> + * use to configure that object.
> + *
> + * For instance, we can set up a two-output device like so::
Shouldn't we have two connectors and encoders here? And symlink the
second encoder to the second connector. crtc_other would also need a
symlink to the second encoder possible_crtc to actually gain a second
output....
Alternatively maybe drop the two-ouput and crtc_other?
> + *
> + * DRM_PLANE_TYPE_PRIMARY=1
> + * DRM_PLANE_TYPE_CURSOR=2
> + * DRM_PLANE_TYPE_OVERLAY=0
> + *
> + * mkdir /config/vkms/test/planes/primary
> + * echo $DRM_PLANE_TYPE_PRIMARY > /config/vkms/test/planes/primary/type
> + *
> + * mkdir /config/vkms/test/planes/other_primary
> + * echo $DRM_PLANE_TYPE_PRIMARY > /config/vkms/test/planes/other_primary/type
> + *
> + * mkdir /config/vkms/test/planes/cursor
> + * echo $DRM_PLANE_TYPE_CURSOR > /config/vkms/test/planes/cursor/type
> + *
> + * mkdir /config/vkms/test/planes/overlay
> + * echo $DRM_PLANE_TYPE_OVERLAY > /config/vkms/test/planes/overlay/type
> + *
> + * mkdir /config/vkms/test/crtcs/crtc
> + * mkdir /config/vkms/test/crtcs/crtc_other
> + * mkdir /config/vkms/test/encoders/encoder
> + * mkdir /config/vkms/test/connectors/connector
> + *
> + * You can see that specific attributes, such as ``.../<plane>/type``, can be
> + * configured by writing into them. Associating objects together can be done via
> + * symlinks::
> + *
> + * ln -s /config/vkms/test/encoders/encoder /config/vkms/test/connectors/connector/possible_encoders
> + *
> + * ln -s /config/vkms/test/crtcs/crtc /config/vkms/test/encoders/encoder/possible_crtcs/
> + * ln -s /config/vkms/test/crtcs/crtc /config/vkms/test/planes/primary/possible_crtcs/
> + * ln -s /config/vkms/test/crtcs/crtc /config/vkms/test/planes/cursor/possible_crtcs/
> + * ln -s /config/vkms/test/crtcs/crtc /config/vkms/test/planes/overlay/possible_crtcs/
> + *
> + * ln -s /config/vkms/test/crtcs/crtc_other /config/vkms/test/planes/overlay/possible_crtcs/
> + * ln -s /config/vkms/test/crtcs/crtc_other /config/vkms/test/planes/other_primary/possible_crtcs/
> + *
> + * Finally, to enable your configured device, just write 1 to the ``enabled``
> + * file::
> + *
> + * echo 1 > /config/vkms/test/enabled
> + *
> + * When you're done with the virtual device, you can clean up the device like
> + * so::
> + *
> + * echo 0 > /config/vkms/test/enabled
> + *
> + * rm /config/vkms/test/connectors/connector/possible_encoders/encoder
> + * rm /config/vkms/test/encoders/encoder/possible_crtcs/crtc
> + * rm /config/vkms/test/planes/primary/possible_crtcs/crtc
> + * rm /config/vkms/test/planes/cursor/possible_crtcs/crtc
> + * rm /config/vkms/test/planes/overlay/possible_crtcs/crtc
> + * rm /config/vkms/test/planes/overlay/possible_crtcs/crtc_other
> + * rm /config/vkms/test/planes/other_primary/possible_crtcs/crtc_other
> + *
> + * rmdir /config/vkms/test/planes/primary
> + * rmdir /config/vkms/test/planes/other_primary
> + * rmdir /config/vkms/test/planes/cursor
> + * rmdir /config/vkms/test/planes/overlay
> + * rmdir /config/vkms/test/crtcs/crtc
> + * rmdir /config/vkms/test/crtcs/crtc_other
> + * rmdir /config/vkms/test/encoders/encoder
> + * rmdir /config/vkms/test/connectors/connector
> + *
> + * rmdir /config/vkms/test
> + */
> +
> +/*
> + * Common helpers (i.e. common sub-groups)
> + */
> +
> +/* Possible CRTCs, e.g. /config/vkms/device/<object>/possible_crtcs/<symlink> */
> +
> +static struct config_item_type crtc_type;
> +
> +static int possible_crtcs_allow_link(struct config_item *src,
> + struct config_item *target)
> +{
> + struct vkms_config_links *links = item_to_config_links(src);
> + struct vkms_config_crtc *crtc;
> +
> + if (target->ci_type != &crtc_type) {
> + DRM_ERROR("Unable to link non-CRTCs.\n");
> + return -EINVAL;
> + }
> +
> + crtc = item_to_config_crtc(target);
> +
> + if (links->linked_object_bitmap & BIT(crtc->crtc_config_idx)) {
> + DRM_ERROR(
> + "Tried to add two symlinks to the same CRTC from the same object\n");
> + return -EINVAL;
> + }
> +
> + links->linked_object_bitmap |= BIT(crtc->crtc_config_idx);
> +
> + return 0;
> +}
> +
> +static void possible_crtcs_drop_link(struct config_item *src,
> + struct config_item *target)
> +{
> + struct vkms_config_links *links = item_to_config_links(src);
> + struct vkms_config_crtc *crtc = item_to_config_crtc(target);
> +
> + links->linked_object_bitmap &= ~BIT(crtc->crtc_config_idx);
> +}
> +
> +static struct configfs_item_operations possible_crtcs_item_ops = {
> + .allow_link = &possible_crtcs_allow_link,
> + .drop_link = &possible_crtcs_drop_link,
> +};
> +
> +static struct config_item_type possible_crtcs_group_type = {
> + .ct_item_ops = &possible_crtcs_item_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +static void add_possible_crtcs(struct config_group *parent,
> + struct config_group *possible_crtcs)
> +{
> + config_group_init_type_name(possible_crtcs, "possible_crtcs",
> + &possible_crtcs_group_type);
> + configfs_add_default_group(possible_crtcs, parent);
> +}
> +
> +/* Possible encoders, e.g. /config/vkms/device/connector/possible_encoders/<symlink> */
> +
> +static struct config_item_type encoder_type;
> +
> +static int possible_encoders_allow_link(struct config_item *src,
> + struct config_item *target)
> +{
> + struct vkms_config_links *links = item_to_config_links(src);
> + struct vkms_config_encoder *encoder;
> +
> + if (target->ci_type != &encoder_type) {
> + DRM_ERROR("Unable to link non-encoders.\n");
> + return -EINVAL;
> + }
> +
> + encoder = item_to_config_encoder(target);
> +
> + if (links->linked_object_bitmap & BIT(encoder->encoder_config_idx)) {
> + DRM_ERROR(
> + "Tried to add two symlinks to the same encoder from the same object\n");
> + return -EINVAL;
> + }
> +
> + links->linked_object_bitmap |= BIT(encoder->encoder_config_idx);
> +
> + return 0;
> +}
> +
> +static void possible_encoders_drop_link(struct config_item *src,
> + struct config_item *target)
> +{
> + struct vkms_config_links *links = item_to_config_links(src);
> + struct vkms_config_encoder *encoder = item_to_config_encoder(target);
> +
> + links->linked_object_bitmap &= ~BIT(encoder->encoder_config_idx);
> +}
> +
> +static struct configfs_item_operations possible_encoders_item_ops = {
> + .allow_link = &possible_encoders_allow_link,
> + .drop_link = &possible_encoders_drop_link,
> +};
> +
> +static struct config_item_type possible_encoders_group_type = {
> + .ct_item_ops = &possible_encoders_item_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +static void add_possible_encoders(struct config_group *parent,
> + struct config_group *possible_encoders)
> +{
> + config_group_init_type_name(possible_encoders, "possible_encoders",
> + &possible_encoders_group_type);
> + configfs_add_default_group(possible_encoders, parent);
> +}
> +
> +/*
> + * Individual objects (connectors, crtcs, encoders, planes):
> + */
> +
> +/* Connector item, e.g. /config/vkms/device/connectors/ID */
> +
> +static struct config_item_type connector_type = {
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* Crtc item, e.g. /config/vkms/device/crtcs/ID */
> +
> +static struct config_item_type crtc_type = {
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* Encoder item, e.g. /config/vkms/device/encoder/ID */
> +
> +static struct config_item_type encoder_type = {
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* Plane item, e.g. /config/vkms/device/planes/ID */
> +
> +static ssize_t plane_type_show(struct config_item *item, char *buf)
> +{
> + struct vkms_config_plane *plane = item_to_config_plane(item);
> + struct vkms_configfs *configfs = plane_item_to_configfs(item);
> + enum drm_plane_type plane_type;
> +
> + mutex_lock(&configfs->lock);
> + plane_type = plane->type;
> + mutex_unlock(&configfs->lock);
> +
> + return sprintf(buf, "%u", plane_type);
> +}
> +
> +static ssize_t plane_type_store(struct config_item *item, const char *buf,
> + size_t len)
> +{
> + struct vkms_config_plane *plane = item_to_config_plane(item);
> + struct vkms_configfs *configfs = plane_item_to_configfs(item);
> + int val, ret;
> +
> + ret = kstrtouint(buf, 10, &val);
> + if (ret)
> + return ret;
> +
> + if (val != DRM_PLANE_TYPE_PRIMARY && val != DRM_PLANE_TYPE_CURSOR &&
> + val != DRM_PLANE_TYPE_OVERLAY)
> + return -EINVAL;
> +
> + mutex_lock(&configfs->lock);
> + plane->type = val;
> + mutex_unlock(&configfs->lock);
> +
> + return len;
> +}
> +
> +CONFIGFS_ATTR(plane_, type);
> +
> +static struct configfs_attribute *plane_attrs[] = {
> + &plane_attr_type,
> + NULL,
> +};
> +
> +static struct config_item_type plane_type = {
> + .ct_attrs = plane_attrs,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/*
> + * Directory groups, e.g. /config/vkms/device/{planes, crtcs, ...}
> + */
> +
> +/* Connectors group: /config/vkms/device/connectors/ */
> +
> +static struct config_group *connectors_group_make(struct config_group *group,
> + const char *name)
> +{
> + struct vkms_config_connector *connector =
> + kzalloc(sizeof(*connector), GFP_KERNEL);
> + if (!connector)
> + return ERR_PTR(-ENOMEM);
> +
> + config_group_init_type_name(&connector->config_group, name,
> + &connector_type);
> + add_possible_encoders(&connector->config_group,
> + &connector->possible_encoders.group);
> +
> + return &connector->config_group;
> +}
> +
> +static void connectors_group_drop(struct config_group *group,
> + struct config_item *item)
> +{
> + struct vkms_config_connector *connector =
> + item_to_config_connector(item);
> + kfree(connector);
> +}
> +
> +static struct configfs_group_operations connectors_group_ops = {
> + .make_group = &connectors_group_make,
> + .drop_item = &connectors_group_drop,
> +};
> +
> +static struct config_item_type connectors_group_type = {
> + .ct_group_ops = &connectors_group_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* CRTCs group: /config/vkms/device/crtcs/ */
> +
> +static struct config_group *crtcs_group_make(struct config_group *group,
> + const char *name)
> +{
> + struct vkms_configfs *configfs =
> + container_of(group, struct vkms_configfs, crtcs_group);
> + unsigned long next_idx;
> + struct vkms_config_crtc *crtc;
> +
> + mutex_lock(&configfs->lock);
> +
> + next_idx = find_first_zero_bit(&configfs->allocated_crtcs,
> + VKMS_MAX_OUTPUT_OBJECTS);
> +
> + if (next_idx == VKMS_MAX_OUTPUT_OBJECTS) {
> + DRM_ERROR("Unable to allocate another CRTC.\n");
> + mutex_unlock(&configfs->lock);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
> + if (!crtc) {
> + DRM_ERROR("Unable to allocate CRTC.\n");
> + mutex_unlock(&configfs->lock);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + config_group_init_type_name(&crtc->config_group, name, &crtc_type);
> + crtc->crtc_config_idx = next_idx;
> +
> + set_bit(next_idx, &configfs->allocated_crtcs);
> +
> + mutex_unlock(&configfs->lock);
> +
> + return &crtc->config_group;
> +}
> +
> +static void crtcs_group_drop(struct config_group *group,
> + struct config_item *item)
> +{
> + struct vkms_config_crtc *crtc = item_to_config_crtc(item);
> +
> + kfree(crtc);
> +}
> +
> +static struct configfs_group_operations crtcs_group_ops = {
> + .make_group = &crtcs_group_make,
> + .drop_item = &crtcs_group_drop,
> +};
> +
> +static struct config_item_type crtcs_group_type = {
> + .ct_group_ops = &crtcs_group_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* Encoders group: /config/vkms/device/encoders/ */
> +
> +static struct config_group *encoders_group_make(struct config_group *group,
> + const char *name)
> +{
> + struct vkms_configfs *configfs =
> + container_of(group, struct vkms_configfs, encoders_group);
> + unsigned long next_idx;
> + struct vkms_config_encoder *encoder;
> +
> + mutex_lock(&configfs->lock);
> +
> + next_idx = find_first_zero_bit(&configfs->allocated_encoders,
> + VKMS_MAX_OUTPUT_OBJECTS);
> +
> + if (next_idx == VKMS_MAX_OUTPUT_OBJECTS) {
> + DRM_ERROR("Unable to allocate another encoder.\n");
> + mutex_unlock(&configfs->lock);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + encoder = kzalloc(sizeof(*encoder), GFP_KERNEL);
> + if (!encoder) {
> + DRM_ERROR("Unable to allocate encoder.\n");
> + mutex_unlock(&configfs->lock);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + config_group_init_type_name(&encoder->config_group, name,
> + &encoder_type);
> + add_possible_crtcs(&encoder->config_group,
> + &encoder->possible_crtcs.group);
> + encoder->encoder_config_idx = next_idx;
> + set_bit(next_idx, &configfs->allocated_encoders);
> +
> + mutex_unlock(&configfs->lock);
> +
> + return &encoder->config_group;
> +}
> +
> +static void encoders_group_drop(struct config_group *group,
> + struct config_item *item)
> +{
> + struct vkms_config_encoder *encoder = item_to_config_encoder(item);
> +
> + kfree(encoder);
> +}
> +
> +static struct configfs_group_operations encoders_group_ops = {
> + .make_group = &encoders_group_make,
> + .drop_item = &encoders_group_drop,
> +};
> +
> +static struct config_item_type encoders_group_type = {
> + .ct_group_ops = &encoders_group_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* Planes group: /config/vkms/device/planes/ */
> +
> +static struct config_group *make_plane_group(struct config_group *group,
> + const char *name)
> +{
> + struct vkms_config_plane *plane = kzalloc(sizeof(*plane), GFP_KERNEL);
> +
> + if (!plane)
> + return ERR_PTR(-ENOMEM);
> +
> + config_group_init_type_name(&plane->config_group, name, &plane_type);
> + add_possible_crtcs(&plane->config_group, &plane->possible_crtcs.group);
> +
> + return &plane->config_group;
> +}
> +
> +static void drop_plane_group(struct config_group *group,
> + struct config_item *item)
> +{
> + struct vkms_config_plane *plane = item_to_config_plane(item);
> +
> + kfree(plane);
> +}
> +
> +static struct configfs_group_operations plane_group_ops = {
> + .make_group = &make_plane_group,
> + .drop_item = &drop_plane_group,
> +};
> +
> +static struct config_item_type planes_group_type = {
> + .ct_group_ops = &plane_group_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +/* Root directory group, e.g. /config/vkms/device */
> +
> +static ssize_t device_enabled_show(struct config_item *item, char *buf)
> +{
> + struct vkms_configfs *configfs = item_to_configfs(item);
> + bool is_enabled;
> +
> + mutex_lock(&configfs->lock);
> + is_enabled = configfs->vkms_device != NULL;
> + mutex_unlock(&configfs->lock);
> +
> + return sprintf(buf, "%d", is_enabled);
> +}
> +
> +static ssize_t device_enabled_store(struct config_item *item, const char *buf,
> + size_t len)
> +{
> + struct vkms_configfs *configfs = item_to_configfs(item);
> + struct vkms_device *device;
> + int value, ret;
> +
> + ret = kstrtoint(buf, 0, &value);
> + if (ret)
> + return ret;
> +
> + if (value != 1)
> + return -EINVAL;
> +
> + mutex_lock(&configfs->lock);
> +
> + if (configfs->vkms_device) {
> + mutex_unlock(&configfs->lock);
> + return len;
> + }
> +
> + device = vkms_add_device(configfs);
> + mutex_unlock(&configfs->lock);
> +
> + if (IS_ERR(device))
> + return -PTR_ERR(device);
> +
> + return len;
> +}
> +
> +CONFIGFS_ATTR(device_, enabled);
> +
> +static ssize_t device_id_show(struct config_item *item, char *buf)
> +{
> + struct vkms_configfs *configfs = item_to_configfs(item);
> + int id = -1;
> +
> + mutex_lock(&configfs->lock);
> + if (configfs->vkms_device)
> + id = configfs->vkms_device->platform->id;
> +
> + mutex_unlock(&configfs->lock);
> +
> + return sprintf(buf, "%d", id);
> +}
> +
> +CONFIGFS_ATTR_RO(device_, id);
> +
> +static struct configfs_attribute *device_group_attrs[] = {
> + &device_attr_id,
> + &device_attr_enabled,
> + NULL,
> +};
> +
> +static struct config_item_type device_group_type = {
> + .ct_attrs = device_group_attrs,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +static void vkms_configfs_setup_default_groups(struct vkms_configfs *configfs,
> + const char *name)
> +{
> + config_group_init_type_name(&configfs->device_group, name,
> + &device_group_type);
> +
> + config_group_init_type_name(&configfs->connectors_group, "connectors",
> + &connectors_group_type);
> + configfs_add_default_group(&configfs->connectors_group,
> + &configfs->device_group);
> +
> + config_group_init_type_name(&configfs->crtcs_group, "crtcs",
> + &crtcs_group_type);
> + configfs_add_default_group(&configfs->crtcs_group,
> + &configfs->device_group);
> +
> + config_group_init_type_name(&configfs->encoders_group, "encoders",
> + &encoders_group_type);
> + configfs_add_default_group(&configfs->encoders_group,
> + &configfs->device_group);
> +
> + config_group_init_type_name(&configfs->planes_group, "planes",
> + &planes_group_type);
> + configfs_add_default_group(&configfs->planes_group,
> + &configfs->device_group);
> +}
> +
> +/* Root directory group and subsystem, e.g. /config/vkms/ */
> +
> +static struct config_group *make_root_group(struct config_group *group,
> + const char *name)
> +{
> + struct vkms_configfs *configfs = kzalloc(sizeof(*configfs), GFP_KERNEL);
> +
> + if (!configfs)
> + return ERR_PTR(-ENOMEM);
> +
> + vkms_configfs_setup_default_groups(configfs, name);
> + mutex_init(&configfs->lock);
> +
> + return &configfs->device_group;
> +}
> +
> +static void drop_root_group(struct config_group *group,
> + struct config_item *item)
> +{
> + struct vkms_configfs *configfs = item_to_configfs(item);
> +
> + mutex_lock(&configfs->lock);
> + if (configfs->vkms_device)
> + vkms_remove_device(configfs->vkms_device);
> + mutex_unlock(&configfs->lock);
> +
> + kfree(configfs);
> +}
> +
> +static struct configfs_group_operations root_group_ops = {
> + .make_group = &make_root_group,
> + .drop_item = &drop_root_group,
> +};
> +
> +static struct config_item_type vkms_type = {
> + .ct_group_ops = &root_group_ops,
> + .ct_owner = THIS_MODULE,
> +};
> +
> +static struct configfs_subsystem vkms_subsys = {
> + .su_group = {
> + .cg_item = {
> + .ci_name = "vkms",
> + .ci_type = &vkms_type,
> + },
> + },
> + .su_mutex = __MUTEX_INITIALIZER(vkms_subsys.su_mutex),
> +};
> +
> +int vkms_init_configfs(void)
> +{
> + config_group_init(&vkms_subsys.su_group);
> + return configfs_register_subsystem(&vkms_subsys);
> +}
> +
> +void vkms_unregister_configfs(void)
> +{
> + configfs_unregister_subsystem(&vkms_subsys);
> +}
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index 6c94c2b5d529..819e880a8cf7 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -9,8 +9,10 @@
> * the GPU in DRM API tests.
> */
>
> -#include "asm-generic/errno-base.h"
> +#include <linux/configfs.h>
> #include <linux/device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/err.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> #include <linux/dma-mapping.h>
> @@ -172,8 +174,8 @@ static int vkms_modeset_init(struct vkms_device *vkmsdev)
> dev->mode_config.preferred_depth = 0;
> dev->mode_config.helper_private = &vkms_mode_config_helpers;
>
> - return vkmsdev->is_default ? vkms_output_init_default(vkmsdev) :
> - -EINVAL;
> + return vkmsdev->configfs ? vkms_output_init(vkmsdev) :
> + vkms_output_init_default(vkmsdev);
> }
>
> static int vkms_platform_probe(struct platform_device *pdev)
> @@ -184,8 +186,10 @@ static int vkms_platform_probe(struct platform_device *pdev)
> void *grp;
>
> grp = devres_open_group(&pdev->dev, NULL, GFP_KERNEL);
> - if (!grp)
> + if (!grp) {
> + DRM_ERROR("Could not open devres group\n");
> return -ENOMEM;
> + }
>
> vkms_device = devm_drm_dev_alloc(&pdev->dev, &vkms_driver,
> struct vkms_device, drm);
> @@ -198,7 +202,7 @@ static int vkms_platform_probe(struct platform_device *pdev)
> vkms_device->config.cursor = enable_cursor;
> vkms_device->config.writeback = enable_writeback;
> vkms_device->config.overlay = enable_overlay;
> - vkms_device->is_default = vkms_device_setup->is_default;
> + vkms_device->configfs = vkms_device_setup->configfs;
>
> ret = dma_coerce_mask_and_coherent(vkms_device->drm.dev,
> DMA_BIT_MASK(64));
> @@ -258,12 +262,43 @@ static struct platform_driver vkms_platform_driver = {
> .driver.name = DRIVER_NAME,
> };
>
> +struct vkms_device *vkms_add_device(struct vkms_configfs *configfs)
> +{
> + struct device *dev = NULL;
> + struct platform_device *pdev;
> + int max_id = 1;
> + struct vkms_device_setup vkms_device_setup = {
> + .configfs = configfs,
> + };
> +
> + while ((dev = platform_find_device_by_driver(
> + dev, &vkms_platform_driver.driver))) {
> + pdev = to_platform_device(dev);
> + max_id = max(max_id, pdev->id);
> + }
> +
> + pdev = platform_device_register_data(NULL, DRIVER_NAME, max_id + 1,
> + &vkms_device_setup,
> + sizeof(vkms_device_setup));
> + if (IS_ERR(pdev)) {
> + DRM_ERROR("Unable to register vkms device'\n");
> + return ERR_PTR(PTR_ERR(pdev));
> + }
> +
> + return platform_get_drvdata(pdev);
> +}
> +
> +void vkms_remove_device(struct vkms_device *vkms_device)
> +{
> + platform_device_unregister(vkms_device->platform);
> +}
> +
> static int __init vkms_init(void)
> {
> int ret;
> struct platform_device *pdev;
> struct vkms_device_setup vkms_device_setup = {
> - .is_default = true,
> + .configfs = NULL,
> };
>
> ret = platform_driver_register(&vkms_platform_driver);
> @@ -281,6 +316,13 @@ static int __init vkms_init(void)
> return PTR_ERR(pdev);
> }
>
> + ret = vkms_init_configfs();
> + if (ret) {
> + DRM_ERROR("Unable to initialize configfs\n");
> + platform_device_unregister(pdev);
> + platform_driver_unregister(&vkms_platform_driver);
> + }
> +
> return 0;
> }
>
> @@ -288,6 +330,8 @@ static void __exit vkms_exit(void)
> {
> struct device *dev;
>
> + vkms_unregister_configfs();
> +
> while ((dev = platform_find_device_by_driver(
> NULL, &vkms_platform_driver.driver))) {
> // platform_find_device_by_driver increments the refcount. Drop
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
> index 4262dcffd7e1..8cdd7949f661 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.h
> +++ b/drivers/gpu/drm/vkms/vkms_drv.h
> @@ -3,6 +3,7 @@
> #ifndef _VKMS_DRV_H_
> #define _VKMS_DRV_H_
>
> +#include <linux/configfs.h>
> #include <linux/hrtimer.h>
>
> #include <drm/drm.h>
> @@ -10,6 +11,7 @@
> #include <drm/drm_gem.h>
> #include <drm/drm_gem_atomic_helper.h>
> #include <drm/drm_encoder.h>
> +#include <drm/drm_plane.h>
> #include <drm/drm_writeback.h>
>
> #define XRES_MIN 10
> @@ -138,14 +140,65 @@ struct vkms_config {
> bool overlay;
> };
>
> +struct vkms_config_links {
> + struct config_group group;
> + unsigned long linked_object_bitmap;
> +};
> +
> +struct vkms_config_connector {
> + struct config_group config_group;
> + struct vkms_config_links possible_encoders;
> +};
> +
> +struct vkms_config_crtc {
> + struct config_group config_group;
> + unsigned long crtc_config_idx;
> +};
> +
> +struct vkms_config_encoder {
> + struct config_group config_group;
> + struct vkms_config_links possible_crtcs;
> + unsigned long encoder_config_idx;
> +};
> +
> +struct vkms_config_plane {
> + struct vkms_configfs *configfs;
> + struct config_group config_group;
> + struct vkms_config_links possible_crtcs;
> + enum drm_plane_type type;
> +};
> +
> +struct vkms_configfs {
> + /* Directory group containing connector configs, e.g. /config/vkms/device/ */
> + struct config_group device_group;
> + /* Directory group containing connector configs, e.g. /config/vkms/device/connectors/ */
> + struct config_group connectors_group;
> + /* Directory group containing CRTC configs, e.g. /config/vkms/device/crtcs/ */
> + struct config_group crtcs_group;
> + /* Directory group containing encoder configs, e.g. /config/vkms/device/encoders/ */
> + struct config_group encoders_group;
> + /* Directory group containing plane configs, e.g. /config/vkms/device/planes/ */
> + struct config_group planes_group;
> +
> + unsigned long allocated_crtcs;
> + unsigned long allocated_encoders;
> +
> + struct mutex lock;
> +
> + /* The platform device if this is registered, otherwise NULL */
> + struct vkms_device *vkms_device;
> +};
> +
> struct vkms_device_setup {
> - bool is_default;
> + // Is NULL in the case of the default card.
> + struct vkms_configfs *configfs;
> };
>
> struct vkms_device {
> struct drm_device drm;
> struct platform_device *platform;
> - bool is_default;
> + // Is NULL in the case of the default card.
> + struct vkms_configfs *configfs;
> struct vkms_output output;
> struct vkms_config config;
> };
> @@ -164,11 +217,42 @@ struct vkms_device {
> #define to_vkms_plane_state(target)\
> container_of(target, struct vkms_plane_state, base.base)
>
> +#define item_to_configfs(item) \
> + container_of(to_config_group(item), struct vkms_configfs, device_group)
> +
> +#define item_to_config_connector(item) \
> + container_of(to_config_group(item), struct vkms_config_connector, \
> + config_group)
> +
> +#define item_to_config_crtc(item) \
> + container_of(to_config_group(item), struct vkms_config_crtc, \
> + config_group)
> +
> +#define item_to_config_encoder(item) \
> + container_of(to_config_group(item), struct vkms_config_encoder, \
> + config_group)
> +
> +#define item_to_config_plane(item) \
> + container_of(to_config_group(item), struct vkms_config_plane, \
> + config_group)
> +
> +#define item_to_config_links(item) \
> + container_of(to_config_group(item), struct vkms_config_links, group)
> +
> +#define plane_item_to_configfs(item) \
> + container_of(to_config_group(item->ci_parent), struct vkms_configfs, \
> + planes_group)
> +
> +/* Devices */
> +struct vkms_device *vkms_add_device(struct vkms_configfs *configfs);
> +void vkms_remove_device(struct vkms_device *vkms_device);
> +
> /* CRTC */
> struct vkms_crtc *vkms_crtc_init(struct vkms_device *vkmsdev,
> struct drm_plane *primary,
> struct drm_plane *cursor);
>
> +int vkms_output_init(struct vkms_device *vkmsdev);
> int vkms_output_init_default(struct vkms_device *vkmsdev);
>
> struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
> @@ -191,4 +275,8 @@ void vkms_writeback_row(struct vkms_writeback_job *wb, const struct line_buffer
> int vkms_enable_writeback_connector(struct vkms_device *vkmsdev,
> struct vkms_crtc *vkms_crtc);
>
> +/* ConfigFS Support */
> +int vkms_init_configfs(void);
> +void vkms_unregister_configfs(void);
> +
> #endif /* _VKMS_DRV_H_ */
> diff --git a/drivers/gpu/drm/vkms/vkms_output.c b/drivers/gpu/drm/vkms/vkms_output.c
> index bfc2e2362c6d..dc69959c5e1d 100644
> --- a/drivers/gpu/drm/vkms/vkms_output.c
> +++ b/drivers/gpu/drm/vkms/vkms_output.c
> @@ -176,3 +176,8 @@ int vkms_output_init_default(struct vkms_device *vkmsdev)
>
> return ret;
> }
> +
> +int vkms_output_init(struct vkms_device *vkmsdev)
> +{
> + return -EOPNOTSUPP;
> +}
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