diff options
Diffstat (limited to 'drivers/gpu/drm/drm_client_event.c')
| -rw-r--r-- | drivers/gpu/drm/drm_client_event.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_client_event.c b/drivers/gpu/drm/drm_client_event.c new file mode 100644 index 000000000000..e303de564485 --- /dev/null +++ b/drivers/gpu/drm/drm_client_event.c @@ -0,0 +1,197 @@ +// SPDX-License-Identifier: GPL-2.0 or MIT +/* + * Copyright 2018 Noralf Trønnes + */ + +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/seq_file.h> + +#include <drm/drm_client.h> +#include <drm/drm_client_event.h> +#include <drm/drm_debugfs.h> +#include <drm/drm_device.h> +#include <drm/drm_drv.h> +#include <drm/drm_print.h> + +#include "drm_internal.h" + +/** + * drm_client_dev_unregister - Unregister clients + * @dev: DRM device + * + * This function releases all clients by calling each client's + * &drm_client_funcs.unregister callback. The callback function + * is responsibe for releaseing all resources including the client + * itself. + * + * The helper drm_dev_unregister() calls this function. Drivers + * that use it don't need to call this function themselves. + */ +void drm_client_dev_unregister(struct drm_device *dev) +{ + struct drm_client_dev *client, *tmp; + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + return; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry_safe(client, tmp, &dev->clientlist, list) { + list_del(&client->list); + if (client->funcs && client->funcs->unregister) { + client->funcs->unregister(client); + } else { + drm_client_release(client); + kfree(client); + } + } + mutex_unlock(&dev->clientlist_mutex); +} +EXPORT_SYMBOL(drm_client_dev_unregister); + +/** + * drm_client_dev_hotplug - Send hotplug event to clients + * @dev: DRM device + * + * This function calls the &drm_client_funcs.hotplug callback on the attached clients. + * + * drm_kms_helper_hotplug_event() calls this function, so drivers that use it + * don't need to call this function themselves. + */ +void drm_client_dev_hotplug(struct drm_device *dev) +{ + struct drm_client_dev *client; + int ret; + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + return; + + if (!dev->mode_config.num_connector) { + drm_dbg_kms(dev, "No connectors found, will not send hotplug events!\n"); + return; + } + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) { + if (!client->funcs || !client->funcs->hotplug) + continue; + + if (client->hotplug_failed) + continue; + + ret = client->funcs->hotplug(client); + drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret); + if (ret) + client->hotplug_failed = true; + } + mutex_unlock(&dev->clientlist_mutex); +} +EXPORT_SYMBOL(drm_client_dev_hotplug); + +void drm_client_dev_restore(struct drm_device *dev) +{ + struct drm_client_dev *client; + int ret; + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + return; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) { + if (!client->funcs || !client->funcs->restore) + continue; + + ret = client->funcs->restore(client); + drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret); + if (!ret) /* The first one to return zero gets the privilege to restore */ + break; + } + mutex_unlock(&dev->clientlist_mutex); +} + +static int drm_client_suspend(struct drm_client_dev *client, bool holds_console_lock) +{ + struct drm_device *dev = client->dev; + int ret = 0; + + if (drm_WARN_ON_ONCE(dev, client->suspended)) + return 0; + + if (client->funcs && client->funcs->suspend) + ret = client->funcs->suspend(client, holds_console_lock); + drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret); + + client->suspended = true; + + return ret; +} + +void drm_client_dev_suspend(struct drm_device *dev, bool holds_console_lock) +{ + struct drm_client_dev *client; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) { + if (!client->suspended) + drm_client_suspend(client, holds_console_lock); + } + mutex_unlock(&dev->clientlist_mutex); +} +EXPORT_SYMBOL(drm_client_dev_suspend); + +static int drm_client_resume(struct drm_client_dev *client, bool holds_console_lock) +{ + struct drm_device *dev = client->dev; + int ret = 0; + + if (drm_WARN_ON_ONCE(dev, !client->suspended)) + return 0; + + if (client->funcs && client->funcs->resume) + ret = client->funcs->resume(client, holds_console_lock); + drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret); + + client->suspended = false; + + return ret; +} + +void drm_client_dev_resume(struct drm_device *dev, bool holds_console_lock) +{ + struct drm_client_dev *client; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) { + if (client->suspended) + drm_client_resume(client, holds_console_lock); + } + mutex_unlock(&dev->clientlist_mutex); +} +EXPORT_SYMBOL(drm_client_dev_resume); + +#ifdef CONFIG_DEBUG_FS +static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data) +{ + struct drm_debugfs_entry *entry = m->private; + struct drm_device *dev = entry->dev; + struct drm_printer p = drm_seq_file_printer(m); + struct drm_client_dev *client; + + mutex_lock(&dev->clientlist_mutex); + list_for_each_entry(client, &dev->clientlist, list) + drm_printf(&p, "%s\n", client->name); + mutex_unlock(&dev->clientlist_mutex); + + return 0; +} + +static const struct drm_debugfs_info drm_client_debugfs_list[] = { + { "internal_clients", drm_client_debugfs_internal_clients, 0 }, +}; + +void drm_client_debugfs_init(struct drm_device *dev) +{ + drm_debugfs_add_files(dev, drm_client_debugfs_list, + ARRAY_SIZE(drm_client_debugfs_list)); +} +#endif |