1 /*
2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
4 * Copyright (c) 2009-2010, Code Aurora Forum.
5 * All rights reserved.
6 *
7 * Author: Rickard E. (Rik) Faith <faith@valinux.com>
8 * Author: Gareth Hughes <gareth@valinux.com>
9 *
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice (including the next
18 * paragraph) shall be included in all copies or substantial portions of the
19 * Software.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
27 * OTHER DEALINGS IN THE SOFTWARE.
28 */
29
30 #ifndef _DRM_FILE_H_
31 #define _DRM_FILE_H_
32
33 #include <linux/types.h>
34 #include <linux/completion.h>
35 #include <linux/idr.h>
36
37 #include <uapi/drm/drm.h>
38
39 #include <drm/drm_prime.h>
40
41 struct dma_fence;
42 struct drm_file;
43 struct drm_device;
44 struct device;
45
46 /*
47 * FIXME: Not sure we want to have drm_minor here in the end, but to avoid
48 * header include loops we need it here for now.
49 */
50
51 /* Note that the order of this enum is ABI (it determines
52 * /dev/dri/renderD* numbers).
53 */
54 enum drm_minor_type {
55 DRM_MINOR_PRIMARY,
56 DRM_MINOR_CONTROL,
57 DRM_MINOR_RENDER,
58 };
59
60 /**
61 * struct drm_minor - DRM device minor structure
62 *
63 * This structure represents a DRM minor number for device nodes in /dev.
64 * Entirely opaque to drivers and should never be inspected directly by drivers.
65 * Drivers instead should only interact with &struct drm_file and of course
66 * &struct drm_device, which is also where driver-private data and resources can
67 * be attached to.
68 */
69 struct drm_minor {
70 /* private: */
71 int index; /* Minor device number */
72 int type; /* Control or render */
73 struct device *kdev; /* Linux device */
74 struct drm_device *dev;
75
76 struct dentry *debugfs_root;
77
78 struct list_head debugfs_list;
79 struct mutex debugfs_lock; /* Protects debugfs_list. */
80 };
81
82 /**
83 * struct drm_pending_event - Event queued up for userspace to read
84 *
85 * This represents a DRM event. Drivers can use this as a generic completion
86 * mechanism, which supports kernel-internal &struct completion, &struct dma_fence
87 * and also the DRM-specific &struct drm_event delivery mechanism.
88 */
89 struct drm_pending_event {
90 /**
91 * @completion:
92 *
93 * Optional pointer to a kernel internal completion signalled when
94 * drm_send_event() is called, useful to internally synchronize with
95 * nonblocking operations.
96 */
97 struct completion *completion;
98
99 /**
100 * @completion_release:
101 *
102 * Optional callback currently only used by the atomic modeset helpers
103 * to clean up the reference count for the structure @completion is
104 * stored in.
105 */
106 void (*completion_release)(struct completion *completion);
107
108 /**
109 * @event:
110 *
111 * Pointer to the actual event that should be sent to userspace to be
112 * read using drm_read(). Can be optional, since nowadays events are
113 * also used to signal kernel internal threads with @completion or DMA
114 * transactions using @fence.
115 */
116 struct drm_event *event;
117
118 /**
119 * @fence:
120 *
121 * Optional DMA fence to unblock other hardware transactions which
122 * depend upon the nonblocking DRM operation this event represents.
123 */
124 struct dma_fence *fence;
125
126 /**
127 * @file_priv:
128 *
129 * &struct drm_file where @event should be delivered to. Only set when
130 * @event is set.
131 */
132 struct drm_file *file_priv;
133
134 /**
135 * @link:
136 *
137 * Double-linked list to keep track of this event. Can be used by the
138 * driver up to the point when it calls drm_send_event(), after that
139 * this list entry is owned by the core for its own book-keeping.
140 */
141 struct list_head link;
142
143 /**
144 * @pending_link:
145 *
146 * Entry on &drm_file.pending_event_list, to keep track of all pending
147 * events for @file_priv, to allow correct unwinding of them when
148 * userspace closes the file before the event is delivered.
149 */
150 struct list_head pending_link;
151 };
152
153 /**
154 * struct drm_file - DRM file private data
155 *
156 * This structure tracks DRM state per open file descriptor.
157 */
158 struct drm_file {
159 /**
160 * @authenticated:
161 *
162 * Whether the client is allowed to submit rendering, which for legacy
163 * nodes means it must be authenticated.
164 *
165 * See also the :ref:`section on primary nodes and authentication
166 * <drm_primary_node>`.
167 */
168 bool authenticated;
169
170 /**
171 * @stereo_allowed:
172 *
173 * True when the client has asked us to expose stereo 3D mode flags.
174 */
175 bool stereo_allowed;
176
177 /**
178 * @universal_planes:
179 *
180 * True if client understands CRTC primary planes and cursor planes
181 * in the plane list. Automatically set when @atomic is set.
182 */
183 bool universal_planes;
184
185 /** @atomic: True if client understands atomic properties. */
186 bool atomic;
187
188 /**
189 * @aspect_ratio_allowed:
190 *
191 * True, if client can handle picture aspect ratios, and has requested
192 * to pass this information along with the mode.
193 */
194 bool aspect_ratio_allowed;
195
196 /**
197 * @writeback_connectors:
198 *
199 * True if client understands writeback connectors
200 */
201 bool writeback_connectors;
202
203 /**
204 * @is_master:
205 *
206 * This client is the creator of @master. Protected by struct
207 * &drm_device.master_mutex.
208 *
209 * See also the :ref:`section on primary nodes and authentication
210 * <drm_primary_node>`.
211 */
212 bool is_master;
213
214 /**
215 * @master:
216 *
217 * Master this node is currently associated with. Only relevant if
218 * drm_is_primary_client() returns true. Note that this only
219 * matches &drm_device.master if the master is the currently active one.
220 *
221 * See also @authentication and @is_master and the :ref:`section on
222 * primary nodes and authentication <drm_primary_node>`.
223 */
224 struct drm_master *master;
225
226 /** @pid: Process that opened this file. */
227 struct pid *pid;
228
229 /** @magic: Authentication magic, see @authenticated. */
230 drm_magic_t magic;
231
232 /**
233 * @lhead:
234 *
235 * List of all open files of a DRM device, linked into
236 * &drm_device.filelist. Protected by &drm_device.filelist_mutex.
237 */
238 struct list_head lhead;
239
240 /** @minor: &struct drm_minor for this file. */
241 struct drm_minor *minor;
242
243 /**
244 * @object_idr:
245 *
246 * Mapping of mm object handles to object pointers. Used by the GEM
247 * subsystem. Protected by @table_lock.
248 */
249 struct idr object_idr;
250
251 /** @table_lock: Protects @object_idr. */
252 spinlock_t table_lock;
253
254 /** @syncobj_idr: Mapping of sync object handles to object pointers. */
255 struct idr syncobj_idr;
256 /** @syncobj_table_lock: Protects @syncobj_idr. */
257 spinlock_t syncobj_table_lock;
258
259 /** @filp: Pointer to the core file structure. */
260 struct file *filp;
261
262 /**
263 * @driver_priv:
264 *
265 * Optional pointer for driver private data. Can be allocated in
266 * &drm_driver.open and should be freed in &drm_driver.postclose.
267 */
268 void *driver_priv;
269
270 /**
271 * @fbs:
272 *
273 * List of &struct drm_framebuffer associated with this file, using the
274 * &drm_framebuffer.filp_head entry.
275 *
276 * Protected by @fbs_lock. Note that the @fbs list holds a reference on
277 * the framebuffer object to prevent it from untimely disappearing.
278 */
279 struct list_head fbs;
280
281 /** @fbs_lock: Protects @fbs. */
282 struct mutex fbs_lock;
283
284 /**
285 * @blobs:
286 *
287 * User-created blob properties; this retains a reference on the
288 * property.
289 *
290 * Protected by @drm_mode_config.blob_lock;
291 */
292 struct list_head blobs;
293
294 /** @event_wait: Waitqueue for new events added to @event_list. */
295 wait_queue_head_t event_wait;
296
297 /**
298 * @pending_event_list:
299 *
300 * List of pending &struct drm_pending_event, used to clean up pending
301 * events in case this file gets closed before the event is signalled.
302 * Uses the &drm_pending_event.pending_link entry.
303 *
304 * Protect by &drm_device.event_lock.
305 */
306 struct list_head pending_event_list;
307
308 /**
309 * @event_list:
310 *
311 * List of &struct drm_pending_event, ready for delivery to userspace
312 * through drm_read(). Uses the &drm_pending_event.link entry.
313 *
314 * Protect by &drm_device.event_lock.
315 */
316 struct list_head event_list;
317
318 /**
319 * @event_space:
320 *
321 * Available event space to prevent userspace from
322 * exhausting kernel memory. Currently limited to the fairly arbitrary
323 * value of 4KB.
324 */
325 int event_space;
326
327 /** @event_read_lock: Serializes drm_read(). */
328 struct mutex event_read_lock;
329
330 /**
331 * @prime:
332 *
333 * Per-file buffer caches used by the PRIME buffer sharing code.
334 */
335 struct drm_prime_file_private prime;
336
337 /* private: */
338 #if IS_ENABLED(CONFIG_DRM_LEGACY)
339 unsigned long lock_count; /* DRI1 legacy lock count */
340 #endif
341 };
342
343 /**
344 * drm_is_primary_client - is this an open file of the primary node
345 * @file_priv: DRM file
346 *
347 * Returns true if this is an open file of the primary node, i.e.
348 * &drm_file.minor of @file_priv is a primary minor.
349 *
350 * See also the :ref:`section on primary nodes and authentication
351 * <drm_primary_node>`.
352 */
353 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
354 {
355 return file_priv->minor->type == DRM_MINOR_PRIMARY;
356 }
357
358 /**
359 * drm_is_render_client - is this an open file of the render node
360 * @file_priv: DRM file
361 *
362 * Returns true if this is an open file of the render node, i.e.
363 * &drm_file.minor of @file_priv is a render minor.
364 *
365 * See also the :ref:`section on render nodes <drm_render_node>`.
366 */
367 static inline bool drm_is_render_client(const struct drm_file *file_priv)
368 {
369 return file_priv->minor->type == DRM_MINOR_RENDER;
370 }
371
372 int drm_open(struct inode *inode, struct file *filp);
373 ssize_t drm_read(struct file *filp, char __user *buffer,
374 size_t count, loff_t *offset);
375 int drm_release(struct inode *inode, struct file *filp);
376 __poll_t drm_poll(struct file *filp, struct poll_table_struct *wait);
377 int drm_event_reserve_init_locked(struct drm_device *dev,
378 struct drm_file *file_priv,
379 struct drm_pending_event *p,
380 struct drm_event *e);
381 int drm_event_reserve_init(struct drm_device *dev,
382 struct drm_file *file_priv,
383 struct drm_pending_event *p,
384 struct drm_event *e);
385 void drm_event_cancel_free(struct drm_device *dev,
386 struct drm_pending_event *p);
387 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
388 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
389
390 #endif /* _DRM_FILE_H_ */