1 #ifndef _DRM_DEVICE_H_
2 #define _DRM_DEVICE_H_
3
4 #include <linux/list.h>
5 #include <linux/kref.h>
6 #include <linux/mutex.h>
7 #include <linux/idr.h>
8 #include <linux/sched.h>
9
10 #include <drm/drm_mode_config.h>
11
12 struct drm_driver;
13 struct drm_minor;
14 struct drm_master;
15 struct drm_vblank_crtc;
16 struct drm_vma_offset_manager;
17 struct drm_vram_mm;
18 struct drm_fb_helper;
19
20 struct inode;
21
22 struct pci_dev;
23 struct pci_controller;
24
25 /*
26 * Recovery methods for wedged device in order of less to more side-effects.
27 * To be used with drm_dev_wedged_event() as recovery @method. Callers can
28 * use any one, multiple (or'd) or none depending on their needs.
29 *
30 * Refer to "Device Wedging" chapter in Documentation/gpu/drm-uapi.rst for more
31 * details.
32 */
33 #define DRM_WEDGE_RECOVERY_NONE BIT(0) /* optional telemetry collection */
34 #define DRM_WEDGE_RECOVERY_REBIND BIT(1) /* unbind + bind driver */
35 #define DRM_WEDGE_RECOVERY_BUS_RESET BIT(2) /* unbind + reset bus device + bind */
36 #define DRM_WEDGE_RECOVERY_VENDOR BIT(3) /* vendor specific recovery method */
37
38 /**
39 * struct drm_wedge_task_info - information about the guilty task of a wedge dev
40 */
41 struct drm_wedge_task_info {
42 /** @pid: pid of the task */
43 pid_t pid;
44 /** @comm: command name of the task */
45 char comm[TASK_COMM_LEN];
46 };
47
48 /**
49 * enum switch_power_state - power state of drm device
50 */
51
52 enum switch_power_state {
53 /** @DRM_SWITCH_POWER_ON: Power state is ON */
54 DRM_SWITCH_POWER_ON = 0,
55
56 /** @DRM_SWITCH_POWER_OFF: Power state is OFF */
57 DRM_SWITCH_POWER_OFF = 1,
58
59 /** @DRM_SWITCH_POWER_CHANGING: Power state is changing */
60 DRM_SWITCH_POWER_CHANGING = 2,
61
62 /** @DRM_SWITCH_POWER_DYNAMIC_OFF: Suspended */
63 DRM_SWITCH_POWER_DYNAMIC_OFF = 3,
64 };
65
66 /**
67 * struct drm_device - DRM device structure
68 *
69 * This structure represent a complete card that
70 * may contain multiple heads.
71 */
72 struct drm_device {
73 /** @if_version: Highest interface version set */
74 int if_version;
75
76 /** @ref: Object ref-count */
77 struct kref ref;
78
79 /** @dev: Device structure of bus-device */
80 struct device *dev;
81
82 /**
83 * @dma_dev:
84 *
85 * Device for DMA operations. Only required if the device @dev
86 * cannot perform DMA by itself. Should be NULL otherwise. Call
87 * drm_dev_dma_dev() to get the DMA device instead of using this
88 * field directly. Call drm_dev_set_dma_dev() to set this field.
89 *
90 * DRM devices are sometimes bound to virtual devices that cannot
91 * perform DMA by themselves. Drivers should set this field to the
92 * respective DMA controller.
93 *
94 * Devices on USB and other peripheral busses also cannot perform
95 * DMA by themselves. The @dma_dev field should point the bus
96 * controller that does DMA on behalve of such a device. Required
97 * for importing buffers via dma-buf.
98 *
99 * If set, the DRM core automatically releases the reference on the
100 * device.
101 */
102 struct device *dma_dev;
103
104 /**
105 * @managed:
106 *
107 * Managed resources linked to the lifetime of this &drm_device as
108 * tracked by @ref.
109 */
110 struct {
111 /** @managed.resources: managed resources list */
112 struct list_head resources;
113 /** @managed.final_kfree: pointer for final kfree() call */
114 void *final_kfree;
115 /** @managed.lock: protects @managed.resources */
116 spinlock_t lock;
117 } managed;
118
119 /** @driver: DRM driver managing the device */
120 const struct drm_driver *driver;
121
122 /**
123 * @dev_private:
124 *
125 * DRM driver private data. This is deprecated and should be left set to
126 * NULL.
127 *
128 * Instead of using this pointer it is recommended that drivers use
129 * devm_drm_dev_alloc() and embed struct &drm_device in their larger
130 * per-device structure.
131 */
132 void *dev_private;
133
134 /**
135 * @primary:
136 *
137 * Primary node. Drivers should not interact with this
138 * directly. debugfs interfaces can be registered with
139 * drm_debugfs_add_file(), and sysfs should be directly added on the
140 * hardware (and not character device node) struct device @dev.
141 */
142 struct drm_minor *primary;
143
144 /**
145 * @render:
146 *
147 * Render node. Drivers should not interact with this directly ever.
148 * Drivers should not expose any additional interfaces in debugfs or
149 * sysfs on this node.
150 */
151 struct drm_minor *render;
152
153 /** @accel: Compute Acceleration node */
154 struct drm_minor *accel;
155
156 /**
157 * @registered:
158 *
159 * Internally used by drm_dev_register() and drm_connector_register().
160 */
161 bool registered;
162
163 /**
164 * @master:
165 *
166 * Currently active master for this device.
167 * Protected by &master_mutex
168 */
169 struct drm_master *master;
170
171 /**
172 * @driver_features: per-device driver features
173 *
174 * Drivers can clear specific flags here to disallow
175 * certain features on a per-device basis while still
176 * sharing a single &struct drm_driver instance across
177 * all devices.
178 */
179 u32 driver_features;
180
181 /**
182 * @unplugged:
183 *
184 * Flag to tell if the device has been unplugged.
185 * See drm_dev_enter() and drm_dev_is_unplugged().
186 */
187 bool unplugged;
188
189 /** @anon_inode: inode for private address-space */
190 struct inode *anon_inode;
191
192 /** @unique: Unique name of the device */
193 char *unique;
194
195 /**
196 * @master_mutex:
197 *
198 * Lock for &drm_minor.master and &drm_file.is_master
199 */
200 struct mutex master_mutex;
201
202 /**
203 * @open_count:
204 *
205 * Usage counter for outstanding files open,
206 * protected by drm_global_mutex
207 */
208 atomic_t open_count;
209
210 /** @filelist_mutex: Protects @filelist. */
211 struct mutex filelist_mutex;
212 /**
213 * @filelist:
214 *
215 * List of userspace clients, linked through &drm_file.lhead.
216 */
217 struct list_head filelist;
218
219 /**
220 * @filelist_internal:
221 *
222 * List of open DRM files for in-kernel clients.
223 * Protected by &filelist_mutex.
224 */
225 struct list_head filelist_internal;
226
227 /**
228 * @clientlist_mutex:
229 *
230 * Protects &clientlist access.
231 */
232 struct mutex clientlist_mutex;
233
234 /**
235 * @clientlist:
236 *
237 * List of in-kernel clients. Protected by &clientlist_mutex.
238 */
239 struct list_head clientlist;
240
241 /**
242 * @client_sysrq_list:
243 *
244 * Entry into list of devices registered for sysrq. Allows in-kernel
245 * clients on this device to handle sysrq keys.
246 */
247 struct list_head client_sysrq_list;
248
249 /**
250 * @vblank_disable_immediate:
251 *
252 * If true, vblank interrupt will be disabled immediately when the
253 * refcount drops to zero, as opposed to via the vblank disable
254 * timer.
255 *
256 * This can be set to true it the hardware has a working vblank counter
257 * with high-precision timestamping (otherwise there are races) and the
258 * driver uses drm_crtc_vblank_on() and drm_crtc_vblank_off()
259 * appropriately. Also, see @max_vblank_count,
260 * &drm_crtc_funcs.get_vblank_counter and
261 * &drm_vblank_crtc_config.disable_immediate.
262 */
263 bool vblank_disable_immediate;
264
265 /**
266 * @vblank:
267 *
268 * Array of vblank tracking structures, one per &struct drm_crtc. For
269 * historical reasons (vblank support predates kernel modesetting) this
270 * is free-standing and not part of &struct drm_crtc itself. It must be
271 * initialized explicitly by calling drm_vblank_init().
272 */
273 struct drm_vblank_crtc *vblank;
274
275 /**
276 * @vblank_time_lock:
277 *
278 * Protects vblank count and time updates during vblank enable/disable
279 */
280 spinlock_t vblank_time_lock;
281 /**
282 * @vbl_lock: Top-level vblank references lock, wraps the low-level
283 * @vblank_time_lock.
284 */
285 spinlock_t vbl_lock;
286
287 /**
288 * @max_vblank_count:
289 *
290 * Maximum value of the vblank registers. This value +1 will result in a
291 * wrap-around of the vblank register. It is used by the vblank core to
292 * handle wrap-arounds.
293 *
294 * If set to zero the vblank core will try to guess the elapsed vblanks
295 * between times when the vblank interrupt is disabled through
296 * high-precision timestamps. That approach is suffering from small
297 * races and imprecision over longer time periods, hence exposing a
298 * hardware vblank counter is always recommended.
299 *
300 * This is the statically configured device wide maximum. The driver
301 * can instead choose to use a runtime configurable per-crtc value
302 * &drm_vblank_crtc.max_vblank_count, in which case @max_vblank_count
303 * must be left at zero. See drm_crtc_set_max_vblank_count() on how
304 * to use the per-crtc value.
305 *
306 * If non-zero, &drm_crtc_funcs.get_vblank_counter must be set.
307 */
308 u32 max_vblank_count;
309
310 /** @vblank_event_list: List of vblank events */
311 struct list_head vblank_event_list;
312
313 /**
314 * @event_lock:
315 *
316 * Protects @vblank_event_list and event delivery in
317 * general. See drm_send_event() and drm_send_event_locked().
318 */
319 spinlock_t event_lock;
320
321 /** @num_crtcs: Number of CRTCs on this device */
322 unsigned int num_crtcs;
323
324 /** @mode_config: Current mode config */
325 struct drm_mode_config mode_config;
326
327 /** @object_name_lock: GEM information */
328 struct mutex object_name_lock;
329
330 /** @object_name_idr: GEM information */
331 struct idr object_name_idr;
332
333 /** @vma_offset_manager: GEM information */
334 struct drm_vma_offset_manager *vma_offset_manager;
335
336 /** @vram_mm: VRAM MM memory manager */
337 struct drm_vram_mm *vram_mm;
338
339 /**
340 * @switch_power_state:
341 *
342 * Power state of the client.
343 * Used by drivers supporting the switcheroo driver.
344 * The state is maintained in the
345 * &vga_switcheroo_client_ops.set_gpu_state callback
346 */
347 enum switch_power_state switch_power_state;
348
349 /**
350 * @fb_helper:
351 *
352 * Pointer to the fbdev emulation structure.
353 * Set by drm_fb_helper_init() and cleared by drm_fb_helper_fini().
354 */
355 struct drm_fb_helper *fb_helper;
356
357 /**
358 * @debugfs_root:
359 *
360 * Root directory for debugfs files.
361 */
362 struct dentry *debugfs_root;
363 };
364
365 void drm_dev_set_dma_dev(struct drm_device *dev, struct device *dma_dev);
366
367 /**
368 * drm_dev_dma_dev - returns the DMA device for a DRM device
369 * @dev: DRM device
370 *
371 * Returns the DMA device of the given DRM device. By default, this
372 * the DRM device's parent. See drm_dev_set_dma_dev().
373 *
374 * Returns:
375 * A DMA-capable device for the DRM device.
376 */
drm_dev_dma_dev(struct drm_device * dev)377 static inline struct device *drm_dev_dma_dev(struct drm_device *dev)
378 {
379 if (dev->dma_dev)
380 return dev->dma_dev;
381 return dev->dev;
382 }
383
384 #endif
385