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 * Copyright 2016 Intel Corp.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the next
15 * paragraph) shall be included in all copies or substantial portions of the
16 * Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27 #ifndef _DRM_DRV_H_
28 #define _DRM_DRV_H_
29
30 #include <linux/list.h>
31 #include <linux/irqreturn.h>
32
33 #include <video/nomodeset.h>
34
35 #include <drm/drm_device.h>
36
37 struct drm_file;
38 struct drm_gem_object;
39 struct drm_master;
40 struct drm_minor;
41 struct dma_buf;
42 struct dma_buf_attachment;
43 struct drm_display_mode;
44 struct drm_mode_create_dumb;
45 struct drm_printer;
46 struct sg_table;
47
48 /**
49 * enum drm_driver_feature - feature flags
50 *
51 * See &drm_driver.driver_features, drm_device.driver_features and
52 * drm_core_check_feature().
53 */
54 enum drm_driver_feature {
55 /**
56 * @DRIVER_GEM:
57 *
58 * Driver use the GEM memory manager. This should be set for all modern
59 * drivers.
60 */
61 DRIVER_GEM = BIT(0),
62 /**
63 * @DRIVER_MODESET:
64 *
65 * Driver supports mode setting interfaces (KMS).
66 */
67 DRIVER_MODESET = BIT(1),
68 /**
69 * @DRIVER_RENDER:
70 *
71 * Driver supports dedicated render nodes. See also the :ref:`section on
72 * render nodes <drm_render_node>` for details.
73 */
74 DRIVER_RENDER = BIT(3),
75 /**
76 * @DRIVER_ATOMIC:
77 *
78 * Driver supports the full atomic modesetting userspace API. Drivers
79 * which only use atomic internally, but do not support the full
80 * userspace API (e.g. not all properties converted to atomic, or
81 * multi-plane updates are not guaranteed to be tear-free) should not
82 * set this flag.
83 */
84 DRIVER_ATOMIC = BIT(4),
85 /**
86 * @DRIVER_SYNCOBJ:
87 *
88 * Driver supports &drm_syncobj for explicit synchronization of command
89 * submission.
90 */
91 DRIVER_SYNCOBJ = BIT(5),
92 /**
93 * @DRIVER_SYNCOBJ_TIMELINE:
94 *
95 * Driver supports the timeline flavor of &drm_syncobj for explicit
96 * synchronization of command submission.
97 */
98 DRIVER_SYNCOBJ_TIMELINE = BIT(6),
99 /**
100 * @DRIVER_COMPUTE_ACCEL:
101 *
102 * Driver supports compute acceleration devices. This flag is mutually exclusive with
103 * @DRIVER_RENDER and @DRIVER_MODESET. Devices that support both graphics and compute
104 * acceleration should be handled by two drivers that are connected using auxiliary bus.
105 */
106 DRIVER_COMPUTE_ACCEL = BIT(7),
107 /**
108 * @DRIVER_GEM_GPUVA:
109 *
110 * Driver supports user defined GPU VA bindings for GEM objects.
111 */
112 DRIVER_GEM_GPUVA = BIT(8),
113 /**
114 * @DRIVER_CURSOR_HOTSPOT:
115 *
116 * Driver supports and requires cursor hotspot information in the
117 * cursor plane (e.g. cursor plane has to actually track the mouse
118 * cursor and the clients are required to set hotspot in order for
119 * the cursor planes to work correctly).
120 */
121 DRIVER_CURSOR_HOTSPOT = BIT(9),
122
123 /* IMPORTANT: Below are all the legacy flags, add new ones above. */
124
125 /**
126 * @DRIVER_USE_AGP:
127 *
128 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
129 * AGP resources. New drivers don't need this.
130 */
131 DRIVER_USE_AGP = BIT(25),
132 /**
133 * @DRIVER_LEGACY:
134 *
135 * Denote a legacy driver using shadow attach. Do not use.
136 */
137 DRIVER_LEGACY = BIT(26),
138 /**
139 * @DRIVER_PCI_DMA:
140 *
141 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
142 * will be enabled. Only for legacy drivers. Do not use.
143 */
144 DRIVER_PCI_DMA = BIT(27),
145 /**
146 * @DRIVER_SG:
147 *
148 * Driver can perform scatter/gather DMA, allocation and mapping of
149 * scatter/gather buffers will be enabled. Only for legacy drivers. Do
150 * not use.
151 */
152 DRIVER_SG = BIT(28),
153
154 /**
155 * @DRIVER_HAVE_DMA:
156 *
157 * Driver supports DMA, the userspace DMA API will be supported. Only
158 * for legacy drivers. Do not use.
159 */
160 DRIVER_HAVE_DMA = BIT(29),
161 /**
162 * @DRIVER_HAVE_IRQ:
163 *
164 * Legacy irq support. Only for legacy drivers. Do not use.
165 */
166 DRIVER_HAVE_IRQ = BIT(30),
167 };
168
169 /**
170 * struct drm_driver - DRM driver structure
171 *
172 * This structure represent the common code for a family of cards. There will be
173 * one &struct drm_device for each card present in this family. It contains lots
174 * of vfunc entries, and a pile of those probably should be moved to more
175 * appropriate places like &drm_mode_config_funcs or into a new operations
176 * structure for GEM drivers.
177 */
178 struct drm_driver {
179 /**
180 * @load:
181 *
182 * Backward-compatible driver callback to complete initialization steps
183 * after the driver is registered. For this reason, may suffer from
184 * race conditions and its use is deprecated for new drivers. It is
185 * therefore only supported for existing drivers not yet converted to
186 * the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
187 * proper and race-free way to set up a &struct drm_device.
188 *
189 * This is deprecated, do not use!
190 *
191 * Returns:
192 *
193 * Zero on success, non-zero value on failure.
194 */
195 int (*load) (struct drm_device *, unsigned long flags);
196
197 /**
198 * @open:
199 *
200 * Driver callback when a new &struct drm_file is opened. Useful for
201 * setting up driver-private data structures like buffer allocators,
202 * execution contexts or similar things. Such driver-private resources
203 * must be released again in @postclose.
204 *
205 * Since the display/modeset side of DRM can only be owned by exactly
206 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
207 * there should never be a need to set up any modeset related resources
208 * in this callback. Doing so would be a driver design bug.
209 *
210 * Returns:
211 *
212 * 0 on success, a negative error code on failure, which will be
213 * promoted to userspace as the result of the open() system call.
214 */
215 int (*open) (struct drm_device *, struct drm_file *);
216
217 /**
218 * @postclose:
219 *
220 * One of the driver callbacks when a new &struct drm_file is closed.
221 * Useful for tearing down driver-private data structures allocated in
222 * @open like buffer allocators, execution contexts or similar things.
223 *
224 * Since the display/modeset side of DRM can only be owned by exactly
225 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
226 * there should never be a need to tear down any modeset related
227 * resources in this callback. Doing so would be a driver design bug.
228 */
229 void (*postclose) (struct drm_device *, struct drm_file *);
230
231 /**
232 * @unload:
233 *
234 * Reverse the effects of the driver load callback. Ideally,
235 * the clean up performed by the driver should happen in the
236 * reverse order of the initialization. Similarly to the load
237 * hook, this handler is deprecated and its usage should be
238 * dropped in favor of an open-coded teardown function at the
239 * driver layer. See drm_dev_unregister() and drm_dev_put()
240 * for the proper way to remove a &struct drm_device.
241 *
242 * The unload() hook is called right after unregistering
243 * the device.
244 *
245 */
246 void (*unload) (struct drm_device *);
247
248 /**
249 * @release:
250 *
251 * Optional callback for destroying device data after the final
252 * reference is released, i.e. the device is being destroyed.
253 *
254 * This is deprecated, clean up all memory allocations associated with a
255 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
256 * managed resources functions.
257 */
258 void (*release) (struct drm_device *);
259
260 /**
261 * @master_set:
262 *
263 * Called whenever the minor master is set. Only used by vmwgfx.
264 */
265 void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
266 bool from_open);
267 /**
268 * @master_drop:
269 *
270 * Called whenever the minor master is dropped. Only used by vmwgfx.
271 */
272 void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
273
274 /**
275 * @debugfs_init:
276 *
277 * Allows drivers to create driver-specific debugfs files.
278 */
279 void (*debugfs_init)(struct drm_minor *minor);
280
281 /**
282 * @gem_create_object: constructor for gem objects
283 *
284 * Hook for allocating the GEM object struct, for use by the CMA
285 * and SHMEM GEM helpers. Returns a GEM object on success, or an
286 * ERR_PTR()-encoded error code otherwise.
287 */
288 struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
289 size_t size);
290
291 /**
292 * @prime_handle_to_fd:
293 *
294 * PRIME export function. Only used by vmwgfx.
295 */
296 int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
297 uint32_t handle, uint32_t flags, int *prime_fd);
298 /**
299 * @prime_fd_to_handle:
300 *
301 * PRIME import function. Only used by vmwgfx.
302 */
303 int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
304 int prime_fd, uint32_t *handle);
305
306 /**
307 * @gem_prime_import:
308 *
309 * Import hook for GEM drivers.
310 *
311 * This defaults to drm_gem_prime_import() if not set.
312 */
313 struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
314 struct dma_buf *dma_buf);
315 /**
316 * @gem_prime_import_sg_table:
317 *
318 * Optional hook used by the PRIME helper functions
319 * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
320 */
321 struct drm_gem_object *(*gem_prime_import_sg_table)(
322 struct drm_device *dev,
323 struct dma_buf_attachment *attach,
324 struct sg_table *sgt);
325
326 /**
327 * @dumb_create:
328 *
329 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
330 * TTM or something else entirely) and returns the resulting buffer handle. This
331 * handle can then be wrapped up into a framebuffer modeset object.
332 *
333 * Note that userspace is not allowed to use such objects for render
334 * acceleration - drivers must create their own private ioctls for such a use
335 * case.
336 *
337 * Width, height and depth are specified in the &drm_mode_create_dumb
338 * argument. The callback needs to fill the handle, pitch and size for
339 * the created buffer.
340 *
341 * Called by the user via ioctl.
342 *
343 * Returns:
344 *
345 * Zero on success, negative errno on failure.
346 */
347 int (*dumb_create)(struct drm_file *file_priv,
348 struct drm_device *dev,
349 struct drm_mode_create_dumb *args);
350 /**
351 * @dumb_map_offset:
352 *
353 * Allocate an offset in the drm device node's address space to be able to
354 * memory map a dumb buffer.
355 *
356 * The default implementation is drm_gem_create_mmap_offset(). GEM based
357 * drivers must not overwrite this.
358 *
359 * Called by the user via ioctl.
360 *
361 * Returns:
362 *
363 * Zero on success, negative errno on failure.
364 */
365 int (*dumb_map_offset)(struct drm_file *file_priv,
366 struct drm_device *dev, uint32_t handle,
367 uint64_t *offset);
368
369 /**
370 * @show_fdinfo:
371 *
372 * Print device specific fdinfo. See Documentation/gpu/drm-usage-stats.rst.
373 */
374 void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
375
376 /** @major: driver major number */
377 int major;
378 /** @minor: driver minor number */
379 int minor;
380 /** @patchlevel: driver patch level */
381 int patchlevel;
382 /** @name: driver name */
383 char *name;
384 /** @desc: driver description */
385 char *desc;
386 /** @date: driver date, unused, to be removed */
387 char *date;
388
389 /**
390 * @driver_features:
391 * Driver features, see &enum drm_driver_feature. Drivers can disable
392 * some features on a per-instance basis using
393 * &drm_device.driver_features.
394 */
395 u32 driver_features;
396
397 /**
398 * @ioctls:
399 *
400 * Array of driver-private IOCTL description entries. See the chapter on
401 * :ref:`IOCTL support in the userland interfaces
402 * chapter<drm_driver_ioctl>` for the full details.
403 */
404
405 const struct drm_ioctl_desc *ioctls;
406 /** @num_ioctls: Number of entries in @ioctls. */
407 int num_ioctls;
408
409 /**
410 * @fops:
411 *
412 * File operations for the DRM device node. See the discussion in
413 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
414 * some examples.
415 */
416 const struct file_operations *fops;
417 };
418
419 void *__devm_drm_dev_alloc(struct device *parent,
420 const struct drm_driver *driver,
421 size_t size, size_t offset);
422
423 /**
424 * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
425 * @parent: Parent device object
426 * @driver: DRM driver
427 * @type: the type of the struct which contains struct &drm_device
428 * @member: the name of the &drm_device within @type.
429 *
430 * This allocates and initialize a new DRM device. No device registration is done.
431 * Call drm_dev_register() to advertice the device to user space and register it
432 * with other core subsystems. This should be done last in the device
433 * initialization sequence to make sure userspace can't access an inconsistent
434 * state.
435 *
436 * The initial ref-count of the object is 1. Use drm_dev_get() and
437 * drm_dev_put() to take and drop further ref-counts.
438 *
439 * It is recommended that drivers embed &struct drm_device into their own device
440 * structure.
441 *
442 * Note that this manages the lifetime of the resulting &drm_device
443 * automatically using devres. The DRM device initialized with this function is
444 * automatically put on driver detach using drm_dev_put().
445 *
446 * RETURNS:
447 * Pointer to new DRM device, or ERR_PTR on failure.
448 */
449 #define devm_drm_dev_alloc(parent, driver, type, member) \
450 ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
451 offsetof(type, member)))
452
453 struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
454 struct device *parent);
455 int drm_dev_register(struct drm_device *dev, unsigned long flags);
456 void drm_dev_unregister(struct drm_device *dev);
457
458 void drm_dev_get(struct drm_device *dev);
459 void drm_dev_put(struct drm_device *dev);
460 void drm_put_dev(struct drm_device *dev);
461 bool drm_dev_enter(struct drm_device *dev, int *idx);
462 void drm_dev_exit(int idx);
463 void drm_dev_unplug(struct drm_device *dev);
464
465 /**
466 * drm_dev_is_unplugged - is a DRM device unplugged
467 * @dev: DRM device
468 *
469 * This function can be called to check whether a hotpluggable is unplugged.
470 * Unplugging itself is singalled through drm_dev_unplug(). If a device is
471 * unplugged, these two functions guarantee that any store before calling
472 * drm_dev_unplug() is visible to callers of this function after it completes
473 *
474 * WARNING: This function fundamentally races against drm_dev_unplug(). It is
475 * recommended that drivers instead use the underlying drm_dev_enter() and
476 * drm_dev_exit() function pairs.
477 */
drm_dev_is_unplugged(struct drm_device * dev)478 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
479 {
480 int idx;
481
482 if (drm_dev_enter(dev, &idx)) {
483 drm_dev_exit(idx);
484 return false;
485 }
486
487 return true;
488 }
489
490 /**
491 * drm_core_check_all_features - check driver feature flags mask
492 * @dev: DRM device to check
493 * @features: feature flag(s) mask
494 *
495 * This checks @dev for driver features, see &drm_driver.driver_features,
496 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
497 *
498 * Returns true if all features in the @features mask are supported, false
499 * otherwise.
500 */
drm_core_check_all_features(const struct drm_device * dev,u32 features)501 static inline bool drm_core_check_all_features(const struct drm_device *dev,
502 u32 features)
503 {
504 u32 supported = dev->driver->driver_features & dev->driver_features;
505
506 return features && (supported & features) == features;
507 }
508
509 /**
510 * drm_core_check_feature - check driver feature flags
511 * @dev: DRM device to check
512 * @feature: feature flag
513 *
514 * This checks @dev for driver features, see &drm_driver.driver_features,
515 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
516 *
517 * Returns true if the @feature is supported, false otherwise.
518 */
drm_core_check_feature(const struct drm_device * dev,enum drm_driver_feature feature)519 static inline bool drm_core_check_feature(const struct drm_device *dev,
520 enum drm_driver_feature feature)
521 {
522 return drm_core_check_all_features(dev, feature);
523 }
524
525 /**
526 * drm_drv_uses_atomic_modeset - check if the driver implements
527 * atomic_commit()
528 * @dev: DRM device
529 *
530 * This check is useful if drivers do not have DRIVER_ATOMIC set but
531 * have atomic modesetting internally implemented.
532 */
drm_drv_uses_atomic_modeset(struct drm_device * dev)533 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
534 {
535 return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
536 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
537 }
538
539
540 /* TODO: Inline drm_firmware_drivers_only() in all its callers. */
drm_firmware_drivers_only(void)541 static inline bool drm_firmware_drivers_only(void)
542 {
543 return video_firmware_drivers_only();
544 }
545
546 #if defined(CONFIG_DEBUG_FS)
547 void drm_debugfs_dev_init(struct drm_device *dev, struct dentry *root);
548 #else
drm_debugfs_dev_init(struct drm_device * dev,struct dentry * root)549 static inline void drm_debugfs_dev_init(struct drm_device *dev, struct dentry *root)
550 {
551 }
552 #endif
553
554 #endif
555