1/* SPDX-License-Identifier: GPL-2.0 or MIT */
2
3#ifndef _DRM_CLIENT_H_
4#define _DRM_CLIENT_H_
5
6#include <linux/iosys-map.h>
7#include <linux/lockdep.h>
8#include <linux/mutex.h>
9#include <linux/types.h>
10
11#include <drm/drm_connector.h>
12#include <drm/drm_crtc.h>
13
14struct drm_client_dev;
15struct drm_device;
16struct drm_file;
17struct drm_framebuffer;
18struct drm_gem_object;
19struct drm_minor;
20struct module;
21
22/**
23 * struct drm_client_funcs - DRM client callbacks
24 */
25struct drm_client_funcs {
26 /**
27 * @owner: The module owner
28 */
29 struct module *owner;
30
31 /**
32 * @unregister:
33 *
34 * Called when &drm_device is unregistered. The client should respond by
35 * releasing its resources using drm_client_release().
36 *
37 * This callback is optional.
38 */
39 void (*unregister)(struct drm_client_dev *client);
40
41 /**
42 * @restore:
43 *
44 * Called on drm_lastclose(). The first client instance in the list that
45 * returns zero gets the privilege to restore and no more clients are
46 * called. This callback is not called after @unregister has been called.
47 *
48 * Note that the core does not guarantee exclusion against concurrent
49 * drm_open(). Clients need to ensure this themselves, for example by
50 * using drm_master_internal_acquire() and
51 * drm_master_internal_release().
52 *
53 * This callback is optional.
54 */
55 int (*restore)(struct drm_client_dev *client);
56
57 /**
58 * @hotplug:
59 *
60 * Called on drm_kms_helper_hotplug_event().
61 * This callback is not called after @unregister has been called.
62 *
63 * This callback is optional.
64 */
65 int (*hotplug)(struct drm_client_dev *client);
66
67 /**
68 * @suspend:
69 *
70 * Called when suspending the device.
71 *
72 * This callback is optional.
73 *
74 * FIXME: Some callers hold the console lock when invoking this
75 * function. This interferes with fbdev emulation, which
76 * also tries to acquire the lock. Push the console lock
77 * into the callback and remove 'holds_console_lock'.
78 */
79 int (*suspend)(struct drm_client_dev *client, bool holds_console_lock);
80
81 /**
82 * @resume:
83 *
84 * Called when resuming the device from suspend.
85 *
86 * This callback is optional.
87 *
88 * FIXME: Some callers hold the console lock when invoking this
89 * function. This interferes with fbdev emulation, which
90 * also tries to acquire the lock. Push the console lock
91 * into the callback and remove 'holds_console_lock'.
92 */
93 int (*resume)(struct drm_client_dev *client, bool holds_console_lock);
94};
95
96/**
97 * struct drm_client_dev - DRM client instance
98 */
99struct drm_client_dev {
100 /**
101 * @dev: DRM device
102 */
103 struct drm_device *dev;
104
105 /**
106 * @name: Name of the client.
107 */
108 const char *name;
109
110 /**
111 * @list:
112 *
113 * List of all clients of a DRM device, linked into
114 * &drm_device.clientlist. Protected by &drm_device.clientlist_mutex.
115 */
116 struct list_head list;
117
118 /**
119 * @funcs: DRM client functions (optional)
120 */
121 const struct drm_client_funcs *funcs;
122
123 /**
124 * @file: DRM file
125 */
126 struct drm_file *file;
127
128 /**
129 * @modeset_mutex: Protects @modesets.
130 */
131 struct mutex modeset_mutex;
132
133 /**
134 * @modesets: CRTC configurations
135 */
136 struct drm_mode_set *modesets;
137
138 /**
139 * @suspended:
140 *
141 * The client has been suspended.
142 */
143 bool suspended;
144
145 /**
146 * @hotplug_pending:
147 *
148 * A hotplug event has been received while the client was suspended.
149 * Try again on resume.
150 */
151 bool hotplug_pending;
152
153 /**
154 * @hotplug_failed:
155 *
156 * Set by client hotplug helpers if the hotplugging failed
157 * before. It is usually not tried again.
158 */
159 bool hotplug_failed;
160};
161
162int drm_client_init(struct drm_device *dev, struct drm_client_dev *client,
163 const char *name, const struct drm_client_funcs *funcs);
164void drm_client_release(struct drm_client_dev *client);
165void drm_client_register(struct drm_client_dev *client);
166
167/**
168 * struct drm_client_buffer - DRM client buffer
169 */
170struct drm_client_buffer {
171 /**
172 * @client: DRM client
173 */
174 struct drm_client_dev *client;
175
176 /**
177 * @pitch: Buffer pitch
178 */
179 u32 pitch;
180
181 /**
182 * @gem: GEM object backing this buffer
183 *
184 * FIXME: The dependency on GEM here isn't required, we could
185 * convert the driver handle to a dma-buf instead and use the
186 * backend-agnostic dma-buf vmap support instead. This would
187 * require that the handle2fd prime ioctl is reworked to pull the
188 * fd_install step out of the driver backend hooks, to make that
189 * final step optional for internal users.
190 */
191 struct drm_gem_object *gem;
192
193 /**
194 * @map: Virtual address for the buffer
195 */
196 struct iosys_map map;
197
198 /**
199 * @fb: DRM framebuffer
200 */
201 struct drm_framebuffer *fb;
202};
203
204struct drm_client_buffer *
205drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format);
206void drm_client_framebuffer_delete(struct drm_client_buffer *buffer);
207int drm_client_framebuffer_flush(struct drm_client_buffer *buffer, struct drm_rect *rect);
208int drm_client_buffer_vmap_local(struct drm_client_buffer *buffer,
209 struct iosys_map *map_copy);
210void drm_client_buffer_vunmap_local(struct drm_client_buffer *buffer);
211int drm_client_buffer_vmap(struct drm_client_buffer *buffer,
212 struct iosys_map *map);
213void drm_client_buffer_vunmap(struct drm_client_buffer *buffer);
214
215int drm_client_modeset_create(struct drm_client_dev *client);
216void drm_client_modeset_free(struct drm_client_dev *client);
217int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width, unsigned int height);
218bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation);
219int drm_client_modeset_check(struct drm_client_dev *client);
220int drm_client_modeset_commit_locked(struct drm_client_dev *client);
221int drm_client_modeset_commit(struct drm_client_dev *client);
222int drm_client_modeset_dpms(struct drm_client_dev *client, int mode);
223
224/**
225 * drm_client_for_each_modeset() - Iterate over client modesets
226 * @modeset: &drm_mode_set loop cursor
227 * @client: DRM client
228 */
229#define drm_client_for_each_modeset(modeset, client) \
230 for (({ lockdep_assert_held(&(client)->modeset_mutex); }), \
231 modeset = (client)->modesets; modeset->crtc; modeset++)
232
233/**
234 * drm_client_for_each_connector_iter - connector_list iterator macro
235 * @connector: &struct drm_connector pointer used as cursor
236 * @iter: &struct drm_connector_list_iter
237 *
238 * This iterates the connectors that are useable for internal clients (excludes
239 * writeback connectors).
240 *
241 * For more info see drm_for_each_connector_iter().
242 */
243#define drm_client_for_each_connector_iter(connector, iter) \
244 drm_for_each_connector_iter(connector, iter) \
245 if (connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
246
247#endif
248

source code of linux/include/drm/drm_client.h