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
37struct dmem_cgroup_region;
38struct drm_fb_helper;
39struct drm_fb_helper_surface_size;
40struct drm_file;
41struct drm_gem_object;
42struct drm_master;
43struct drm_minor;
44struct dma_buf;
45struct dma_buf_attachment;
46struct drm_display_mode;
47struct drm_mode_create_dumb;
48struct drm_printer;
49struct sg_table;
50
51/**
52 * enum drm_driver_feature - feature flags
53 *
54 * See &drm_driver.driver_features, drm_device.driver_features and
55 * drm_core_check_feature().
56 */
57enum drm_driver_feature {
58 /**
59 * @DRIVER_GEM:
60 *
61 * Driver use the GEM memory manager. This should be set for all modern
62 * drivers.
63 */
64 DRIVER_GEM = BIT(0),
65 /**
66 * @DRIVER_MODESET:
67 *
68 * Driver supports mode setting interfaces (KMS).
69 */
70 DRIVER_MODESET = BIT(1),
71 /**
72 * @DRIVER_RENDER:
73 *
74 * Driver supports dedicated render nodes. See also the :ref:`section on
75 * render nodes <drm_render_node>` for details.
76 */
77 DRIVER_RENDER = BIT(3),
78 /**
79 * @DRIVER_ATOMIC:
80 *
81 * Driver supports the full atomic modesetting userspace API. Drivers
82 * which only use atomic internally, but do not support the full
83 * userspace API (e.g. not all properties converted to atomic, or
84 * multi-plane updates are not guaranteed to be tear-free) should not
85 * set this flag.
86 */
87 DRIVER_ATOMIC = BIT(4),
88 /**
89 * @DRIVER_SYNCOBJ:
90 *
91 * Driver supports &drm_syncobj for explicit synchronization of command
92 * submission.
93 */
94 DRIVER_SYNCOBJ = BIT(5),
95 /**
96 * @DRIVER_SYNCOBJ_TIMELINE:
97 *
98 * Driver supports the timeline flavor of &drm_syncobj for explicit
99 * synchronization of command submission.
100 */
101 DRIVER_SYNCOBJ_TIMELINE = BIT(6),
102 /**
103 * @DRIVER_COMPUTE_ACCEL:
104 *
105 * Driver supports compute acceleration devices. This flag is mutually exclusive with
106 * @DRIVER_RENDER and @DRIVER_MODESET. Devices that support both graphics and compute
107 * acceleration should be handled by two drivers that are connected using auxiliary bus.
108 */
109 DRIVER_COMPUTE_ACCEL = BIT(7),
110 /**
111 * @DRIVER_GEM_GPUVA:
112 *
113 * Driver supports user defined GPU VA bindings for GEM objects.
114 */
115 DRIVER_GEM_GPUVA = BIT(8),
116 /**
117 * @DRIVER_CURSOR_HOTSPOT:
118 *
119 * Driver supports and requires cursor hotspot information in the
120 * cursor plane (e.g. cursor plane has to actually track the mouse
121 * cursor and the clients are required to set hotspot in order for
122 * the cursor planes to work correctly).
123 */
124 DRIVER_CURSOR_HOTSPOT = BIT(9),
125
126 /* IMPORTANT: Below are all the legacy flags, add new ones above. */
127
128 /**
129 * @DRIVER_USE_AGP:
130 *
131 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
132 * AGP resources. New drivers don't need this.
133 */
134 DRIVER_USE_AGP = BIT(25),
135 /**
136 * @DRIVER_LEGACY:
137 *
138 * Denote a legacy driver using shadow attach. Do not use.
139 */
140 DRIVER_LEGACY = BIT(26),
141 /**
142 * @DRIVER_PCI_DMA:
143 *
144 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
145 * will be enabled. Only for legacy drivers. Do not use.
146 */
147 DRIVER_PCI_DMA = BIT(27),
148 /**
149 * @DRIVER_SG:
150 *
151 * Driver can perform scatter/gather DMA, allocation and mapping of
152 * scatter/gather buffers will be enabled. Only for legacy drivers. Do
153 * not use.
154 */
155 DRIVER_SG = BIT(28),
156
157 /**
158 * @DRIVER_HAVE_DMA:
159 *
160 * Driver supports DMA, the userspace DMA API will be supported. Only
161 * for legacy drivers. Do not use.
162 */
163 DRIVER_HAVE_DMA = BIT(29),
164 /**
165 * @DRIVER_HAVE_IRQ:
166 *
167 * Legacy irq support. Only for legacy drivers. Do not use.
168 */
169 DRIVER_HAVE_IRQ = BIT(30),
170};
171
172/**
173 * struct drm_driver - DRM driver structure
174 *
175 * This structure represent the common code for a family of cards. There will be
176 * one &struct drm_device for each card present in this family. It contains lots
177 * of vfunc entries, and a pile of those probably should be moved to more
178 * appropriate places like &drm_mode_config_funcs or into a new operations
179 * structure for GEM drivers.
180 */
181struct drm_driver {
182 /**
183 * @load:
184 *
185 * Backward-compatible driver callback to complete initialization steps
186 * after the driver is registered. For this reason, may suffer from
187 * race conditions and its use is deprecated for new drivers. It is
188 * therefore only supported for existing drivers not yet converted to
189 * the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
190 * proper and race-free way to set up a &struct drm_device.
191 *
192 * This is deprecated, do not use!
193 *
194 * Returns:
195 *
196 * Zero on success, non-zero value on failure.
197 */
198 int (*load) (struct drm_device *, unsigned long flags);
199
200 /**
201 * @open:
202 *
203 * Driver callback when a new &struct drm_file is opened. Useful for
204 * setting up driver-private data structures like buffer allocators,
205 * execution contexts or similar things. Such driver-private resources
206 * must be released again in @postclose.
207 *
208 * Since the display/modeset side of DRM can only be owned by exactly
209 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
210 * there should never be a need to set up any modeset related resources
211 * in this callback. Doing so would be a driver design bug.
212 *
213 * Returns:
214 *
215 * 0 on success, a negative error code on failure, which will be
216 * promoted to userspace as the result of the open() system call.
217 */
218 int (*open) (struct drm_device *, struct drm_file *);
219
220 /**
221 * @postclose:
222 *
223 * One of the driver callbacks when a new &struct drm_file is closed.
224 * Useful for tearing down driver-private data structures allocated in
225 * @open like buffer allocators, execution contexts or similar things.
226 *
227 * Since the display/modeset side of DRM can only be owned by exactly
228 * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
229 * there should never be a need to tear down any modeset related
230 * resources in this callback. Doing so would be a driver design bug.
231 */
232 void (*postclose) (struct drm_device *, struct drm_file *);
233
234 /**
235 * @unload:
236 *
237 * Reverse the effects of the driver load callback. Ideally,
238 * the clean up performed by the driver should happen in the
239 * reverse order of the initialization. Similarly to the load
240 * hook, this handler is deprecated and its usage should be
241 * dropped in favor of an open-coded teardown function at the
242 * driver layer. See drm_dev_unregister() and drm_dev_put()
243 * for the proper way to remove a &struct drm_device.
244 *
245 * The unload() hook is called right after unregistering
246 * the device.
247 *
248 */
249 void (*unload) (struct drm_device *);
250
251 /**
252 * @release:
253 *
254 * Optional callback for destroying device data after the final
255 * reference is released, i.e. the device is being destroyed.
256 *
257 * This is deprecated, clean up all memory allocations associated with a
258 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
259 * managed resources functions.
260 */
261 void (*release) (struct drm_device *);
262
263 /**
264 * @master_set:
265 *
266 * Called whenever the minor master is set. Only used by vmwgfx.
267 */
268 void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
269 bool from_open);
270 /**
271 * @master_drop:
272 *
273 * Called whenever the minor master is dropped. Only used by vmwgfx.
274 */
275 void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
276
277 /**
278 * @debugfs_init:
279 *
280 * Allows drivers to create driver-specific debugfs files.
281 */
282 void (*debugfs_init)(struct drm_minor *minor);
283
284 /**
285 * @gem_create_object: constructor for gem objects
286 *
287 * Hook for allocating the GEM object struct, for use by the CMA
288 * and SHMEM GEM helpers. Returns a GEM object on success, or an
289 * ERR_PTR()-encoded error code otherwise.
290 */
291 struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
292 size_t size);
293
294 /**
295 * @prime_handle_to_fd:
296 *
297 * PRIME export function. Only used by vmwgfx.
298 */
299 int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
300 uint32_t handle, uint32_t flags, int *prime_fd);
301 /**
302 * @prime_fd_to_handle:
303 *
304 * PRIME import function. Only used by vmwgfx.
305 */
306 int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
307 int prime_fd, uint32_t *handle);
308
309 /**
310 * @gem_prime_import:
311 *
312 * Import hook for GEM drivers.
313 *
314 * This defaults to drm_gem_prime_import() if not set.
315 */
316 struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
317 struct dma_buf *dma_buf);
318 /**
319 * @gem_prime_import_sg_table:
320 *
321 * Optional hook used by the PRIME helper functions
322 * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
323 */
324 struct drm_gem_object *(*gem_prime_import_sg_table)(
325 struct drm_device *dev,
326 struct dma_buf_attachment *attach,
327 struct sg_table *sgt);
328
329 /**
330 * @dumb_create:
331 *
332 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
333 * TTM or something else entirely) and returns the resulting buffer handle. This
334 * handle can then be wrapped up into a framebuffer modeset object.
335 *
336 * Note that userspace is not allowed to use such objects for render
337 * acceleration - drivers must create their own private ioctls for such a use
338 * case.
339 *
340 * Width, height and depth are specified in the &drm_mode_create_dumb
341 * argument. The callback needs to fill the handle, pitch and size for
342 * the created buffer.
343 *
344 * Called by the user via ioctl.
345 *
346 * Returns:
347 *
348 * Zero on success, negative errno on failure.
349 */
350 int (*dumb_create)(struct drm_file *file_priv,
351 struct drm_device *dev,
352 struct drm_mode_create_dumb *args);
353 /**
354 * @dumb_map_offset:
355 *
356 * Allocate an offset in the drm device node's address space to be able to
357 * memory map a dumb buffer.
358 *
359 * The default implementation is drm_gem_create_mmap_offset(). GEM based
360 * drivers must not overwrite this.
361 *
362 * Called by the user via ioctl.
363 *
364 * Returns:
365 *
366 * Zero on success, negative errno on failure.
367 */
368 int (*dumb_map_offset)(struct drm_file *file_priv,
369 struct drm_device *dev, uint32_t handle,
370 uint64_t *offset);
371
372 /**
373 * @fbdev_probe:
374 *
375 * Allocates and initialize the fb_info structure for fbdev emulation.
376 * Furthermore it also needs to allocate the DRM framebuffer used to
377 * back the fbdev.
378 *
379 * This callback is mandatory for fbdev support.
380 *
381 * Returns:
382 *
383 * 0 on success ot a negative error code otherwise.
384 */
385 int (*fbdev_probe)(struct drm_fb_helper *fbdev_helper,
386 struct drm_fb_helper_surface_size *sizes);
387
388 /**
389 * @show_fdinfo:
390 *
391 * Print device specific fdinfo. See Documentation/gpu/drm-usage-stats.rst.
392 */
393 void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
394
395 /** @major: driver major number */
396 int major;
397 /** @minor: driver minor number */
398 int minor;
399 /** @patchlevel: driver patch level */
400 int patchlevel;
401 /** @name: driver name */
402 char *name;
403 /** @desc: driver description */
404 char *desc;
405
406 /**
407 * @driver_features:
408 * Driver features, see &enum drm_driver_feature. Drivers can disable
409 * some features on a per-instance basis using
410 * &drm_device.driver_features.
411 */
412 u32 driver_features;
413
414 /**
415 * @ioctls:
416 *
417 * Array of driver-private IOCTL description entries. See the chapter on
418 * :ref:`IOCTL support in the userland interfaces
419 * chapter<drm_driver_ioctl>` for the full details.
420 */
421
422 const struct drm_ioctl_desc *ioctls;
423 /** @num_ioctls: Number of entries in @ioctls. */
424 int num_ioctls;
425
426 /**
427 * @fops:
428 *
429 * File operations for the DRM device node. See the discussion in
430 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
431 * some examples.
432 */
433 const struct file_operations *fops;
434};
435
436void *__devm_drm_dev_alloc(struct device *parent,
437 const struct drm_driver *driver,
438 size_t size, size_t offset);
439
440struct dmem_cgroup_region *
441drmm_cgroup_register_region(struct drm_device *dev,
442 const char *region_name, u64 size);
443
444/**
445 * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
446 * @parent: Parent device object
447 * @driver: DRM driver
448 * @type: the type of the struct which contains struct &drm_device
449 * @member: the name of the &drm_device within @type.
450 *
451 * This allocates and initialize a new DRM device. No device registration is done.
452 * Call drm_dev_register() to advertice the device to user space and register it
453 * with other core subsystems. This should be done last in the device
454 * initialization sequence to make sure userspace can't access an inconsistent
455 * state.
456 *
457 * The initial ref-count of the object is 1. Use drm_dev_get() and
458 * drm_dev_put() to take and drop further ref-counts.
459 *
460 * It is recommended that drivers embed &struct drm_device into their own device
461 * structure.
462 *
463 * Note that this manages the lifetime of the resulting &drm_device
464 * automatically using devres. The DRM device initialized with this function is
465 * automatically put on driver detach using drm_dev_put().
466 *
467 * RETURNS:
468 * Pointer to new DRM device, or ERR_PTR on failure.
469 */
470#define devm_drm_dev_alloc(parent, driver, type, member) \
471 ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
472 offsetof(type, member)))
473
474struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
475 struct device *parent);
476
477void *__drm_dev_alloc(struct device *parent,
478 const struct drm_driver *driver,
479 size_t size, size_t offset);
480
481int drm_dev_register(struct drm_device *dev, unsigned long flags);
482void drm_dev_unregister(struct drm_device *dev);
483
484void drm_dev_get(struct drm_device *dev);
485void drm_dev_put(struct drm_device *dev);
486void drm_put_dev(struct drm_device *dev);
487bool drm_dev_enter(struct drm_device *dev, int *idx);
488void drm_dev_exit(int idx);
489void drm_dev_unplug(struct drm_device *dev);
490int drm_dev_wedged_event(struct drm_device *dev, unsigned long method,
491 struct drm_wedge_task_info *info);
492
493/**
494 * drm_dev_is_unplugged - is a DRM device unplugged
495 * @dev: DRM device
496 *
497 * This function can be called to check whether a hotpluggable is unplugged.
498 * Unplugging itself is singalled through drm_dev_unplug(). If a device is
499 * unplugged, these two functions guarantee that any store before calling
500 * drm_dev_unplug() is visible to callers of this function after it completes
501 *
502 * WARNING: This function fundamentally races against drm_dev_unplug(). It is
503 * recommended that drivers instead use the underlying drm_dev_enter() and
504 * drm_dev_exit() function pairs.
505 */
506static inline bool drm_dev_is_unplugged(struct drm_device *dev)
507{
508 int idx;
509
510 if (drm_dev_enter(dev, idx: &idx)) {
511 drm_dev_exit(idx);
512 return false;
513 }
514
515 return true;
516}
517
518/**
519 * drm_core_check_all_features - check driver feature flags mask
520 * @dev: DRM device to check
521 * @features: feature flag(s) mask
522 *
523 * This checks @dev for driver features, see &drm_driver.driver_features,
524 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
525 *
526 * Returns true if all features in the @features mask are supported, false
527 * otherwise.
528 */
529static inline bool drm_core_check_all_features(const struct drm_device *dev,
530 u32 features)
531{
532 u32 supported = dev->driver->driver_features & dev->driver_features;
533
534 return features && (supported & features) == features;
535}
536
537/**
538 * drm_core_check_feature - check driver feature flags
539 * @dev: DRM device to check
540 * @feature: feature flag
541 *
542 * This checks @dev for driver features, see &drm_driver.driver_features,
543 * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
544 *
545 * Returns true if the @feature is supported, false otherwise.
546 */
547static inline bool drm_core_check_feature(const struct drm_device *dev,
548 enum drm_driver_feature feature)
549{
550 return drm_core_check_all_features(dev, features: feature);
551}
552
553/**
554 * drm_drv_uses_atomic_modeset - check if the driver implements
555 * atomic_commit()
556 * @dev: DRM device
557 *
558 * This check is useful if drivers do not have DRIVER_ATOMIC set but
559 * have atomic modesetting internally implemented.
560 */
561static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
562{
563 return drm_core_check_feature(dev, feature: DRIVER_ATOMIC) ||
564 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
565}
566
567
568/* TODO: Inline drm_firmware_drivers_only() in all its callers. */
569static inline bool drm_firmware_drivers_only(void)
570{
571 return video_firmware_drivers_only();
572}
573
574#if defined(CONFIG_DEBUG_FS)
575void drm_debugfs_dev_init(struct drm_device *dev);
576void drm_debugfs_init_root(void);
577void drm_debugfs_remove_root(void);
578void drm_debugfs_bridge_params(void);
579#else
580static inline void drm_debugfs_dev_init(struct drm_device *dev)
581{
582}
583
584static inline void drm_debugfs_init_root(void)
585{
586}
587
588static inline void drm_debugfs_remove_root(void)
589{
590}
591
592static inline void drm_debugfs_bridge_params(void)
593{
594}
595#endif
596
597#endif
598

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