1 // SPDX-License-Identifier: GPL-2.0 or MIT
2 /*
3 * Copyright 2018 Noralf Trønnes
4 */
5
6 #include <linux/list.h>
7 #include <linux/mutex.h>
8 #include <linux/seq_file.h>
9
10 #include <drm/drm_client.h>
11 #include <drm/drm_client_event.h>
12 #include <drm/drm_debugfs.h>
13 #include <drm/drm_device.h>
14 #include <drm/drm_drv.h>
15 #include <drm/drm_print.h>
16
17 #include "drm_internal.h"
18
19 /**
20 * drm_client_dev_unregister - Unregister clients
21 * @dev: DRM device
22 *
23 * This function releases all clients by calling each client's
24 * &drm_client_funcs.unregister callback. The callback function
25 * is responsibe for releaseing all resources including the client
26 * itself.
27 *
28 * The helper drm_dev_unregister() calls this function. Drivers
29 * that use it don't need to call this function themselves.
30 */
drm_client_dev_unregister(struct drm_device * dev)31 void drm_client_dev_unregister(struct drm_device *dev)
32 {
33 struct drm_client_dev *client, *tmp;
34
35 if (!drm_core_check_feature(dev, DRIVER_MODESET))
36 return;
37
38 mutex_lock(&dev->clientlist_mutex);
39 list_for_each_entry_safe(client, tmp, &dev->clientlist, list) {
40 list_del(&client->list);
41 if (client->funcs && client->funcs->unregister) {
42 client->funcs->unregister(client);
43 } else {
44 drm_client_release(client);
45 kfree(client);
46 }
47 }
48 mutex_unlock(&dev->clientlist_mutex);
49 }
50 EXPORT_SYMBOL(drm_client_dev_unregister);
51
drm_client_hotplug(struct drm_client_dev * client)52 static void drm_client_hotplug(struct drm_client_dev *client)
53 {
54 struct drm_device *dev = client->dev;
55 int ret;
56
57 if (!client->funcs || !client->funcs->hotplug)
58 return;
59
60 if (client->hotplug_failed)
61 return;
62
63 if (client->suspended) {
64 client->hotplug_pending = true;
65 return;
66 }
67
68 client->hotplug_pending = false;
69 ret = client->funcs->hotplug(client);
70 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
71 if (ret)
72 client->hotplug_failed = true;
73 }
74
75 /**
76 * drm_client_dev_hotplug - Send hotplug event to clients
77 * @dev: DRM device
78 *
79 * This function calls the &drm_client_funcs.hotplug callback on the attached clients.
80 *
81 * drm_kms_helper_hotplug_event() calls this function, so drivers that use it
82 * don't need to call this function themselves.
83 */
drm_client_dev_hotplug(struct drm_device * dev)84 void drm_client_dev_hotplug(struct drm_device *dev)
85 {
86 struct drm_client_dev *client;
87
88 if (!drm_core_check_feature(dev, DRIVER_MODESET))
89 return;
90
91 if (!dev->mode_config.num_connector) {
92 drm_dbg_kms(dev, "No connectors found, will not send hotplug events!\n");
93 return;
94 }
95
96 mutex_lock(&dev->clientlist_mutex);
97 list_for_each_entry(client, &dev->clientlist, list)
98 drm_client_hotplug(client);
99 mutex_unlock(&dev->clientlist_mutex);
100 }
101 EXPORT_SYMBOL(drm_client_dev_hotplug);
102
drm_client_dev_restore(struct drm_device * dev)103 void drm_client_dev_restore(struct drm_device *dev)
104 {
105 struct drm_client_dev *client;
106 int ret;
107
108 if (!drm_core_check_feature(dev, DRIVER_MODESET))
109 return;
110
111 mutex_lock(&dev->clientlist_mutex);
112 list_for_each_entry(client, &dev->clientlist, list) {
113 if (!client->funcs || !client->funcs->restore)
114 continue;
115
116 ret = client->funcs->restore(client);
117 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
118 if (!ret) /* The first one to return zero gets the privilege to restore */
119 break;
120 }
121 mutex_unlock(&dev->clientlist_mutex);
122 }
123
drm_client_suspend(struct drm_client_dev * client,bool holds_console_lock)124 static int drm_client_suspend(struct drm_client_dev *client, bool holds_console_lock)
125 {
126 struct drm_device *dev = client->dev;
127 int ret = 0;
128
129 if (drm_WARN_ON_ONCE(dev, client->suspended))
130 return 0;
131
132 if (client->funcs && client->funcs->suspend)
133 ret = client->funcs->suspend(client, holds_console_lock);
134 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
135
136 client->suspended = true;
137
138 return ret;
139 }
140
drm_client_dev_suspend(struct drm_device * dev,bool holds_console_lock)141 void drm_client_dev_suspend(struct drm_device *dev, bool holds_console_lock)
142 {
143 struct drm_client_dev *client;
144
145 mutex_lock(&dev->clientlist_mutex);
146 list_for_each_entry(client, &dev->clientlist, list) {
147 if (!client->suspended)
148 drm_client_suspend(client, holds_console_lock);
149 }
150 mutex_unlock(&dev->clientlist_mutex);
151 }
152 EXPORT_SYMBOL(drm_client_dev_suspend);
153
drm_client_resume(struct drm_client_dev * client,bool holds_console_lock)154 static int drm_client_resume(struct drm_client_dev *client, bool holds_console_lock)
155 {
156 struct drm_device *dev = client->dev;
157 int ret = 0;
158
159 if (drm_WARN_ON_ONCE(dev, !client->suspended))
160 return 0;
161
162 if (client->funcs && client->funcs->resume)
163 ret = client->funcs->resume(client, holds_console_lock);
164 drm_dbg_kms(dev, "%s: ret=%d\n", client->name, ret);
165
166 client->suspended = false;
167
168 if (client->hotplug_pending)
169 drm_client_hotplug(client);
170
171 return ret;
172 }
173
drm_client_dev_resume(struct drm_device * dev,bool holds_console_lock)174 void drm_client_dev_resume(struct drm_device *dev, bool holds_console_lock)
175 {
176 struct drm_client_dev *client;
177
178 mutex_lock(&dev->clientlist_mutex);
179 list_for_each_entry(client, &dev->clientlist, list) {
180 if (client->suspended)
181 drm_client_resume(client, holds_console_lock);
182 }
183 mutex_unlock(&dev->clientlist_mutex);
184 }
185 EXPORT_SYMBOL(drm_client_dev_resume);
186
187 #ifdef CONFIG_DEBUG_FS
drm_client_debugfs_internal_clients(struct seq_file * m,void * data)188 static int drm_client_debugfs_internal_clients(struct seq_file *m, void *data)
189 {
190 struct drm_debugfs_entry *entry = m->private;
191 struct drm_device *dev = entry->dev;
192 struct drm_printer p = drm_seq_file_printer(m);
193 struct drm_client_dev *client;
194
195 mutex_lock(&dev->clientlist_mutex);
196 list_for_each_entry(client, &dev->clientlist, list)
197 drm_printf(&p, "%s\n", client->name);
198 mutex_unlock(&dev->clientlist_mutex);
199
200 return 0;
201 }
202
203 static const struct drm_debugfs_info drm_client_debugfs_list[] = {
204 { "internal_clients", drm_client_debugfs_internal_clients, 0 },
205 };
206
drm_client_debugfs_init(struct drm_device * dev)207 void drm_client_debugfs_init(struct drm_device *dev)
208 {
209 drm_debugfs_add_files(dev, drm_client_debugfs_list,
210 ARRAY_SIZE(drm_client_debugfs_list));
211 }
212 #endif
213