diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_configfs.c')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_configfs.c | 843 |
1 files changed, 843 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c new file mode 100644 index 000000000000..506666e21c91 --- /dev/null +++ b/drivers/gpu/drm/vkms/vkms_configfs.c @@ -0,0 +1,843 @@ +// SPDX-License-Identifier: GPL-2.0+ +#include <linux/cleanup.h> +#include <linux/configfs.h> +#include <linux/mutex.h> +#include <linux/slab.h> + +#include "vkms_drv.h" +#include "vkms_config.h" +#include "vkms_configfs.h" +#include "vkms_connector.h" + +/* To avoid registering configfs more than once or unregistering on error */ +static bool is_configfs_registered; + +/** + * struct vkms_configfs_device - Configfs representation of a VKMS device + * + * @group: Top level configuration group that represents a VKMS device. + * Initialized when a new directory is created under "/config/vkms/" + * @planes_group: Default subgroup of @group at "/config/vkms/planes" + * @crtcs_group: Default subgroup of @group at "/config/vkms/crtcs" + * @encoders_group: Default subgroup of @group at "/config/vkms/encoders" + * @connectors_group: Default subgroup of @group at "/config/vkms/connectors" + * @lock: Lock used to project concurrent access to the configuration attributes + * @config: Protected by @lock. Configuration of the VKMS device + * @enabled: Protected by @lock. The device is created or destroyed when this + * option changes + */ +struct vkms_configfs_device { + struct config_group group; + struct config_group planes_group; + struct config_group crtcs_group; + struct config_group encoders_group; + struct config_group connectors_group; + + struct mutex lock; + struct vkms_config *config; + bool enabled; +}; + +/** + * struct vkms_configfs_plane - Configfs representation of a plane + * + * @group: Top level configuration group that represents a plane. + * Initialized when a new directory is created under "/config/vkms/planes" + * @possible_crtcs_group: Default subgroup of @group at "plane/possible_crtcs" + * @dev: The vkms_configfs_device this plane belongs to + * @config: Configuration of the VKMS plane + */ +struct vkms_configfs_plane { + struct config_group group; + struct config_group possible_crtcs_group; + struct vkms_configfs_device *dev; + struct vkms_config_plane *config; +}; + +/** + * struct vkms_configfs_crtc - Configfs representation of a CRTC + * + * @group: Top level configuration group that represents a CRTC. + * Initialized when a new directory is created under "/config/vkms/crtcs" + * @dev: The vkms_configfs_device this CRTC belongs to + * @config: Configuration of the VKMS CRTC + */ +struct vkms_configfs_crtc { + struct config_group group; + struct vkms_configfs_device *dev; + struct vkms_config_crtc *config; +}; + +/** + * struct vkms_configfs_encoder - Configfs representation of a encoder + * + * @group: Top level configuration group that represents a encoder. + * Initialized when a new directory is created under "/config/vkms/encoders" + * @possible_crtcs_group: Default subgroup of @group at "encoder/possible_crtcs" + * @dev: The vkms_configfs_device this encoder belongs to + * @config: Configuration of the VKMS encoder + */ +struct vkms_configfs_encoder { + struct config_group group; + struct config_group possible_crtcs_group; + struct vkms_configfs_device *dev; + struct vkms_config_encoder *config; +}; + +/** + * struct vkms_configfs_connector - Configfs representation of a connector + * + * @group: Top level configuration group that represents a connector. + * Initialized when a new directory is created under "/config/vkms/connectors" + * @possible_encoders_group: Default subgroup of @group at + * "connector/possible_encoders" + * @dev: The vkms_configfs_device this connector belongs to + * @config: Configuration of the VKMS connector + */ +struct vkms_configfs_connector { + struct config_group group; + struct config_group possible_encoders_group; + struct vkms_configfs_device *dev; + struct vkms_config_connector *config; +}; + +#define device_item_to_vkms_configfs_device(item) \ + container_of(to_config_group((item)), struct vkms_configfs_device, \ + group) + +#define child_group_to_vkms_configfs_device(group) \ + device_item_to_vkms_configfs_device((&(group)->cg_item)->ci_parent) + +#define plane_item_to_vkms_configfs_plane(item) \ + container_of(to_config_group((item)), struct vkms_configfs_plane, group) + +#define plane_possible_crtcs_item_to_vkms_configfs_plane(item) \ + container_of(to_config_group((item)), struct vkms_configfs_plane, \ + possible_crtcs_group) + +#define crtc_item_to_vkms_configfs_crtc(item) \ + container_of(to_config_group((item)), struct vkms_configfs_crtc, group) + +#define encoder_item_to_vkms_configfs_encoder(item) \ + container_of(to_config_group((item)), struct vkms_configfs_encoder, \ + group) + +#define encoder_possible_crtcs_item_to_vkms_configfs_encoder(item) \ + container_of(to_config_group((item)), struct vkms_configfs_encoder, \ + possible_crtcs_group) + +#define connector_item_to_vkms_configfs_connector(item) \ + container_of(to_config_group((item)), struct vkms_configfs_connector, \ + group) + +#define connector_possible_encoders_item_to_vkms_configfs_connector(item) \ + container_of(to_config_group((item)), struct vkms_configfs_connector, \ + possible_encoders_group) + +static ssize_t crtc_writeback_show(struct config_item *item, char *page) +{ + struct vkms_configfs_crtc *crtc; + bool writeback; + + crtc = crtc_item_to_vkms_configfs_crtc(item); + + scoped_guard(mutex, &crtc->dev->lock) + writeback = vkms_config_crtc_get_writeback(crtc->config); + + return sprintf(page, "%d\n", writeback); +} + +static ssize_t crtc_writeback_store(struct config_item *item, const char *page, + size_t count) +{ + struct vkms_configfs_crtc *crtc; + bool writeback; + + crtc = crtc_item_to_vkms_configfs_crtc(item); + + if (kstrtobool(page, &writeback)) + return -EINVAL; + + scoped_guard(mutex, &crtc->dev->lock) { + if (crtc->dev->enabled) + return -EBUSY; + + vkms_config_crtc_set_writeback(crtc->config, writeback); + } + + return (ssize_t)count; +} + +CONFIGFS_ATTR(crtc_, writeback); + +static struct configfs_attribute *crtc_item_attrs[] = { + &crtc_attr_writeback, + NULL, +}; + +static void crtc_release(struct config_item *item) +{ + struct vkms_configfs_crtc *crtc; + struct mutex *lock; + + crtc = crtc_item_to_vkms_configfs_crtc(item); + lock = &crtc->dev->lock; + + scoped_guard(mutex, lock) { + vkms_config_destroy_crtc(crtc->dev->config, crtc->config); + kfree(crtc); + } +} + +static struct configfs_item_operations crtc_item_operations = { + .release = &crtc_release, +}; + +static const struct config_item_type crtc_item_type = { + .ct_attrs = crtc_item_attrs, + .ct_item_ops = &crtc_item_operations, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *make_crtc_group(struct config_group *group, + const char *name) +{ + struct vkms_configfs_device *dev; + struct vkms_configfs_crtc *crtc; + int ret; + + dev = child_group_to_vkms_configfs_device(group); + + scoped_guard(mutex, &dev->lock) { + if (dev->enabled) + return ERR_PTR(-EBUSY); + + crtc = kzalloc(sizeof(*crtc), GFP_KERNEL); + if (!crtc) + return ERR_PTR(-ENOMEM); + + crtc->dev = dev; + + crtc->config = vkms_config_create_crtc(dev->config); + if (IS_ERR(crtc->config)) { + ret = PTR_ERR(crtc->config); + kfree(crtc); + return ERR_PTR(ret); + } + + config_group_init_type_name(&crtc->group, name, &crtc_item_type); + } + + return &crtc->group; +} + +static struct configfs_group_operations crtcs_group_operations = { + .make_group = &make_crtc_group, +}; + +static const struct config_item_type crtc_group_type = { + .ct_group_ops = &crtcs_group_operations, + .ct_owner = THIS_MODULE, +}; + +static int plane_possible_crtcs_allow_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_plane *plane; + struct vkms_configfs_crtc *crtc; + int ret; + + if (target->ci_type != &crtc_item_type) + return -EINVAL; + + plane = plane_possible_crtcs_item_to_vkms_configfs_plane(src); + crtc = crtc_item_to_vkms_configfs_crtc(target); + + scoped_guard(mutex, &plane->dev->lock) { + if (plane->dev->enabled) + return -EBUSY; + + ret = vkms_config_plane_attach_crtc(plane->config, crtc->config); + } + + return ret; +} + +static void plane_possible_crtcs_drop_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_plane *plane; + struct vkms_configfs_crtc *crtc; + + plane = plane_possible_crtcs_item_to_vkms_configfs_plane(src); + crtc = crtc_item_to_vkms_configfs_crtc(target); + + scoped_guard(mutex, &plane->dev->lock) + vkms_config_plane_detach_crtc(plane->config, crtc->config); +} + +static struct configfs_item_operations plane_possible_crtcs_item_operations = { + .allow_link = plane_possible_crtcs_allow_link, + .drop_link = plane_possible_crtcs_drop_link, +}; + +static const struct config_item_type plane_possible_crtcs_group_type = { + .ct_item_ops = &plane_possible_crtcs_item_operations, + .ct_owner = THIS_MODULE, +}; + +static ssize_t plane_type_show(struct config_item *item, char *page) +{ + struct vkms_configfs_plane *plane; + enum drm_plane_type type; + + plane = plane_item_to_vkms_configfs_plane(item); + + scoped_guard(mutex, &plane->dev->lock) + type = vkms_config_plane_get_type(plane->config); + + return sprintf(page, "%u", type); +} + +static ssize_t plane_type_store(struct config_item *item, const char *page, + size_t count) +{ + struct vkms_configfs_plane *plane; + enum drm_plane_type type; + + plane = plane_item_to_vkms_configfs_plane(item); + + if (kstrtouint(page, 10, &type)) + return -EINVAL; + + if (type != DRM_PLANE_TYPE_OVERLAY && type != DRM_PLANE_TYPE_PRIMARY && + type != DRM_PLANE_TYPE_CURSOR) + return -EINVAL; + + scoped_guard(mutex, &plane->dev->lock) { + if (plane->dev->enabled) + return -EBUSY; + + vkms_config_plane_set_type(plane->config, type); + } + + return (ssize_t)count; +} + +CONFIGFS_ATTR(plane_, type); + +static struct configfs_attribute *plane_item_attrs[] = { + &plane_attr_type, + NULL, +}; + +static void plane_release(struct config_item *item) +{ + struct vkms_configfs_plane *plane; + struct mutex *lock; + + plane = plane_item_to_vkms_configfs_plane(item); + lock = &plane->dev->lock; + + scoped_guard(mutex, lock) { + vkms_config_destroy_plane(plane->config); + kfree(plane); + } +} + +static struct configfs_item_operations plane_item_operations = { + .release = &plane_release, +}; + +static const struct config_item_type plane_item_type = { + .ct_attrs = plane_item_attrs, + .ct_item_ops = &plane_item_operations, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *make_plane_group(struct config_group *group, + const char *name) +{ + struct vkms_configfs_device *dev; + struct vkms_configfs_plane *plane; + int ret; + + dev = child_group_to_vkms_configfs_device(group); + + scoped_guard(mutex, &dev->lock) { + if (dev->enabled) + return ERR_PTR(-EBUSY); + + plane = kzalloc(sizeof(*plane), GFP_KERNEL); + if (!plane) + return ERR_PTR(-ENOMEM); + + plane->dev = dev; + + plane->config = vkms_config_create_plane(dev->config); + if (IS_ERR(plane->config)) { + ret = PTR_ERR(plane->config); + kfree(plane); + return ERR_PTR(ret); + } + + config_group_init_type_name(&plane->group, name, &plane_item_type); + + config_group_init_type_name(&plane->possible_crtcs_group, + "possible_crtcs", + &plane_possible_crtcs_group_type); + configfs_add_default_group(&plane->possible_crtcs_group, + &plane->group); + } + + return &plane->group; +} + +static struct configfs_group_operations planes_group_operations = { + .make_group = &make_plane_group, +}; + +static const struct config_item_type plane_group_type = { + .ct_group_ops = &planes_group_operations, + .ct_owner = THIS_MODULE, +}; + +static int encoder_possible_crtcs_allow_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_encoder *encoder; + struct vkms_configfs_crtc *crtc; + int ret; + + if (target->ci_type != &crtc_item_type) + return -EINVAL; + + encoder = encoder_possible_crtcs_item_to_vkms_configfs_encoder(src); + crtc = crtc_item_to_vkms_configfs_crtc(target); + + scoped_guard(mutex, &encoder->dev->lock) { + if (encoder->dev->enabled) + return -EBUSY; + + ret = vkms_config_encoder_attach_crtc(encoder->config, crtc->config); + } + + return ret; +} + +static void encoder_possible_crtcs_drop_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_encoder *encoder; + struct vkms_configfs_crtc *crtc; + + encoder = encoder_possible_crtcs_item_to_vkms_configfs_encoder(src); + crtc = crtc_item_to_vkms_configfs_crtc(target); + + scoped_guard(mutex, &encoder->dev->lock) + vkms_config_encoder_detach_crtc(encoder->config, crtc->config); +} + +static struct configfs_item_operations encoder_possible_crtcs_item_operations = { + .allow_link = encoder_possible_crtcs_allow_link, + .drop_link = encoder_possible_crtcs_drop_link, +}; + +static const struct config_item_type encoder_possible_crtcs_group_type = { + .ct_item_ops = &encoder_possible_crtcs_item_operations, + .ct_owner = THIS_MODULE, +}; + +static void encoder_release(struct config_item *item) +{ + struct vkms_configfs_encoder *encoder; + struct mutex *lock; + + encoder = encoder_item_to_vkms_configfs_encoder(item); + lock = &encoder->dev->lock; + + scoped_guard(mutex, lock) { + vkms_config_destroy_encoder(encoder->dev->config, encoder->config); + kfree(encoder); + } +} + +static struct configfs_item_operations encoder_item_operations = { + .release = &encoder_release, +}; + +static const struct config_item_type encoder_item_type = { + .ct_item_ops = &encoder_item_operations, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *make_encoder_group(struct config_group *group, + const char *name) +{ + struct vkms_configfs_device *dev; + struct vkms_configfs_encoder *encoder; + int ret; + + dev = child_group_to_vkms_configfs_device(group); + + scoped_guard(mutex, &dev->lock) { + if (dev->enabled) + return ERR_PTR(-EBUSY); + + encoder = kzalloc(sizeof(*encoder), GFP_KERNEL); + if (!encoder) + return ERR_PTR(-ENOMEM); + + encoder->dev = dev; + + encoder->config = vkms_config_create_encoder(dev->config); + if (IS_ERR(encoder->config)) { + ret = PTR_ERR(encoder->config); + kfree(encoder); + return ERR_PTR(ret); + } + + config_group_init_type_name(&encoder->group, name, + &encoder_item_type); + + config_group_init_type_name(&encoder->possible_crtcs_group, + "possible_crtcs", + &encoder_possible_crtcs_group_type); + configfs_add_default_group(&encoder->possible_crtcs_group, + &encoder->group); + } + + return &encoder->group; +} + +static struct configfs_group_operations encoders_group_operations = { + .make_group = &make_encoder_group, +}; + +static const struct config_item_type encoder_group_type = { + .ct_group_ops = &encoders_group_operations, + .ct_owner = THIS_MODULE, +}; + +static ssize_t connector_status_show(struct config_item *item, char *page) +{ + struct vkms_configfs_connector *connector; + enum drm_connector_status status; + + connector = connector_item_to_vkms_configfs_connector(item); + + scoped_guard(mutex, &connector->dev->lock) + status = vkms_config_connector_get_status(connector->config); + + return sprintf(page, "%u", status); +} + +static ssize_t connector_status_store(struct config_item *item, + const char *page, size_t count) +{ + struct vkms_configfs_connector *connector; + enum drm_connector_status status; + + connector = connector_item_to_vkms_configfs_connector(item); + + if (kstrtouint(page, 10, &status)) + return -EINVAL; + + if (status != connector_status_connected && + status != connector_status_disconnected && + status != connector_status_unknown) + return -EINVAL; + + scoped_guard(mutex, &connector->dev->lock) { + vkms_config_connector_set_status(connector->config, status); + + if (connector->dev->enabled) + vkms_trigger_connector_hotplug(connector->dev->config->dev); + } + + return (ssize_t)count; +} + +CONFIGFS_ATTR(connector_, status); + +static struct configfs_attribute *connector_item_attrs[] = { + &connector_attr_status, + NULL, +}; + +static void connector_release(struct config_item *item) +{ + struct vkms_configfs_connector *connector; + struct mutex *lock; + + connector = connector_item_to_vkms_configfs_connector(item); + lock = &connector->dev->lock; + + scoped_guard(mutex, lock) { + vkms_config_destroy_connector(connector->config); + kfree(connector); + } +} + +static struct configfs_item_operations connector_item_operations = { + .release = &connector_release, +}; + +static const struct config_item_type connector_item_type = { + .ct_attrs = connector_item_attrs, + .ct_item_ops = &connector_item_operations, + .ct_owner = THIS_MODULE, +}; + +static int connector_possible_encoders_allow_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_connector *connector; + struct vkms_configfs_encoder *encoder; + int ret; + + if (target->ci_type != &encoder_item_type) + return -EINVAL; + + connector = connector_possible_encoders_item_to_vkms_configfs_connector(src); + encoder = encoder_item_to_vkms_configfs_encoder(target); + + scoped_guard(mutex, &connector->dev->lock) { + if (connector->dev->enabled) + return -EBUSY; + + ret = vkms_config_connector_attach_encoder(connector->config, + encoder->config); + } + + return ret; +} + +static void connector_possible_encoders_drop_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_connector *connector; + struct vkms_configfs_encoder *encoder; + + connector = connector_possible_encoders_item_to_vkms_configfs_connector(src); + encoder = encoder_item_to_vkms_configfs_encoder(target); + + scoped_guard(mutex, &connector->dev->lock) { + vkms_config_connector_detach_encoder(connector->config, + encoder->config); + } +} + +static struct configfs_item_operations connector_possible_encoders_item_operations = { + .allow_link = connector_possible_encoders_allow_link, + .drop_link = connector_possible_encoders_drop_link, +}; + +static const struct config_item_type connector_possible_encoders_group_type = { + .ct_item_ops = &connector_possible_encoders_item_operations, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *make_connector_group(struct config_group *group, + const char *name) +{ + struct vkms_configfs_device *dev; + struct vkms_configfs_connector *connector; + int ret; + + dev = child_group_to_vkms_configfs_device(group); + + scoped_guard(mutex, &dev->lock) { + if (dev->enabled) + return ERR_PTR(-EBUSY); + + connector = kzalloc(sizeof(*connector), GFP_KERNEL); + if (!connector) + return ERR_PTR(-ENOMEM); + + connector->dev = dev; + + connector->config = vkms_config_create_connector(dev->config); + if (IS_ERR(connector->config)) { + ret = PTR_ERR(connector->config); + kfree(connector); + return ERR_PTR(ret); + } + + config_group_init_type_name(&connector->group, name, + &connector_item_type); + + config_group_init_type_name(&connector->possible_encoders_group, + "possible_encoders", + &connector_possible_encoders_group_type); + configfs_add_default_group(&connector->possible_encoders_group, + &connector->group); + } + + return &connector->group; +} + +static struct configfs_group_operations connectors_group_operations = { + .make_group = &make_connector_group, +}; + +static const struct config_item_type connector_group_type = { + .ct_group_ops = &connectors_group_operations, + .ct_owner = THIS_MODULE, +}; + +static ssize_t device_enabled_show(struct config_item *item, char *page) +{ + struct vkms_configfs_device *dev; + bool enabled; + + dev = device_item_to_vkms_configfs_device(item); + + scoped_guard(mutex, &dev->lock) + enabled = dev->enabled; + + return sprintf(page, "%d\n", enabled); +} + +static ssize_t device_enabled_store(struct config_item *item, const char *page, + size_t count) +{ + struct vkms_configfs_device *dev; + bool enabled; + int ret = 0; + + dev = device_item_to_vkms_configfs_device(item); + + if (kstrtobool(page, &enabled)) + return -EINVAL; + + scoped_guard(mutex, &dev->lock) { + if (!dev->enabled && enabled) { + if (!vkms_config_is_valid(dev->config)) + return -EINVAL; + + ret = vkms_create(dev->config); + if (ret) + return ret; + } else if (dev->enabled && !enabled) { + vkms_destroy(dev->config); + } + + dev->enabled = enabled; + } + + return (ssize_t)count; +} + +CONFIGFS_ATTR(device_, enabled); + +static struct configfs_attribute *device_item_attrs[] = { + &device_attr_enabled, + NULL, +}; + +static void device_release(struct config_item *item) +{ + struct vkms_configfs_device *dev; + + dev = device_item_to_vkms_configfs_device(item); + + if (dev->enabled) + vkms_destroy(dev->config); + + mutex_destroy(&dev->lock); + vkms_config_destroy(dev->config); + kfree(dev); +} + +static struct configfs_item_operations device_item_operations = { + .release = &device_release, +}; + +static const struct config_item_type device_item_type = { + .ct_attrs = device_item_attrs, + .ct_item_ops = &device_item_operations, + .ct_owner = THIS_MODULE, +}; + +static struct config_group *make_device_group(struct config_group *group, + const char *name) +{ + struct vkms_configfs_device *dev; + int ret; + + if (strcmp(name, DEFAULT_DEVICE_NAME) == 0) + return ERR_PTR(-EINVAL); + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return ERR_PTR(-ENOMEM); + + dev->config = vkms_config_create(name); + if (IS_ERR(dev->config)) { + ret = PTR_ERR(dev->config); + kfree(dev); + return ERR_PTR(ret); + } + + config_group_init_type_name(&dev->group, name, &device_item_type); + mutex_init(&dev->lock); + + config_group_init_type_name(&dev->planes_group, "planes", + &plane_group_type); + configfs_add_default_group(&dev->planes_group, &dev->group); + + config_group_init_type_name(&dev->crtcs_group, "crtcs", + &crtc_group_type); + configfs_add_default_group(&dev->crtcs_group, &dev->group); + + config_group_init_type_name(&dev->encoders_group, "encoders", + &encoder_group_type); + configfs_add_default_group(&dev->encoders_group, &dev->group); + + config_group_init_type_name(&dev->connectors_group, "connectors", + &connector_group_type); + configfs_add_default_group(&dev->connectors_group, &dev->group); + + return &dev->group; +} + +static struct configfs_group_operations device_group_ops = { + .make_group = &make_device_group, +}; + +static const struct config_item_type device_group_type = { + .ct_group_ops = &device_group_ops, + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem vkms_subsys = { + .su_group = { + .cg_item = { + .ci_name = "vkms", + .ci_type = &device_group_type, + }, + }, + .su_mutex = __MUTEX_INITIALIZER(vkms_subsys.su_mutex), +}; + +int vkms_configfs_register(void) +{ + int ret; + + if (is_configfs_registered) + return 0; + + config_group_init(&vkms_subsys.su_group); + ret = configfs_register_subsystem(&vkms_subsys); + + is_configfs_registered = ret == 0; + + return ret; +} + +void vkms_configfs_unregister(void) +{ + if (is_configfs_registered) + configfs_unregister_subsystem(&vkms_subsys); +} |