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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 : /* IMPORTANT: Below are all the legacy flags, add new ones above. */
109 :
110 : /**
111 : * @DRIVER_USE_AGP:
112 : *
113 : * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
114 : * AGP resources. New drivers don't need this.
115 : */
116 : DRIVER_USE_AGP = BIT(25),
117 : /**
118 : * @DRIVER_LEGACY:
119 : *
120 : * Denote a legacy driver using shadow attach. Do not use.
121 : */
122 : DRIVER_LEGACY = BIT(26),
123 : /**
124 : * @DRIVER_PCI_DMA:
125 : *
126 : * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
127 : * will be enabled. Only for legacy drivers. Do not use.
128 : */
129 : DRIVER_PCI_DMA = BIT(27),
130 : /**
131 : * @DRIVER_SG:
132 : *
133 : * Driver can perform scatter/gather DMA, allocation and mapping of
134 : * scatter/gather buffers will be enabled. Only for legacy drivers. Do
135 : * not use.
136 : */
137 : DRIVER_SG = BIT(28),
138 :
139 : /**
140 : * @DRIVER_HAVE_DMA:
141 : *
142 : * Driver supports DMA, the userspace DMA API will be supported. Only
143 : * for legacy drivers. Do not use.
144 : */
145 : DRIVER_HAVE_DMA = BIT(29),
146 : /**
147 : * @DRIVER_HAVE_IRQ:
148 : *
149 : * Legacy irq support. Only for legacy drivers. Do not use.
150 : */
151 : DRIVER_HAVE_IRQ = BIT(30),
152 : };
153 :
154 : /**
155 : * struct drm_driver - DRM driver structure
156 : *
157 : * This structure represent the common code for a family of cards. There will be
158 : * one &struct drm_device for each card present in this family. It contains lots
159 : * of vfunc entries, and a pile of those probably should be moved to more
160 : * appropriate places like &drm_mode_config_funcs or into a new operations
161 : * structure for GEM drivers.
162 : */
163 : struct drm_driver {
164 : /**
165 : * @load:
166 : *
167 : * Backward-compatible driver callback to complete initialization steps
168 : * after the driver is registered. For this reason, may suffer from
169 : * race conditions and its use is deprecated for new drivers. It is
170 : * therefore only supported for existing drivers not yet converted to
171 : * the new scheme. See devm_drm_dev_alloc() and drm_dev_register() for
172 : * proper and race-free way to set up a &struct drm_device.
173 : *
174 : * This is deprecated, do not use!
175 : *
176 : * Returns:
177 : *
178 : * Zero on success, non-zero value on failure.
179 : */
180 : int (*load) (struct drm_device *, unsigned long flags);
181 :
182 : /**
183 : * @open:
184 : *
185 : * Driver callback when a new &struct drm_file is opened. Useful for
186 : * setting up driver-private data structures like buffer allocators,
187 : * execution contexts or similar things. Such driver-private resources
188 : * must be released again in @postclose.
189 : *
190 : * Since the display/modeset side of DRM can only be owned by exactly
191 : * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
192 : * there should never be a need to set up any modeset related resources
193 : * in this callback. Doing so would be a driver design bug.
194 : *
195 : * Returns:
196 : *
197 : * 0 on success, a negative error code on failure, which will be
198 : * promoted to userspace as the result of the open() system call.
199 : */
200 : int (*open) (struct drm_device *, struct drm_file *);
201 :
202 : /**
203 : * @postclose:
204 : *
205 : * One of the driver callbacks when a new &struct drm_file is closed.
206 : * Useful for tearing down driver-private data structures allocated in
207 : * @open like buffer allocators, execution contexts or similar things.
208 : *
209 : * Since the display/modeset side of DRM can only be owned by exactly
210 : * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
211 : * there should never be a need to tear down any modeset related
212 : * resources in this callback. Doing so would be a driver design bug.
213 : */
214 : void (*postclose) (struct drm_device *, struct drm_file *);
215 :
216 : /**
217 : * @lastclose:
218 : *
219 : * Called when the last &struct drm_file has been closed and there's
220 : * currently no userspace client for the &struct drm_device.
221 : *
222 : * Modern drivers should only use this to force-restore the fbdev
223 : * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
224 : * Anything else would indicate there's something seriously wrong.
225 : * Modern drivers can also use this to execute delayed power switching
226 : * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
227 : * infrastructure.
228 : *
229 : * This is called after @postclose hook has been called.
230 : *
231 : * NOTE:
232 : *
233 : * All legacy drivers use this callback to de-initialize the hardware.
234 : * This is purely because of the shadow-attach model, where the DRM
235 : * kernel driver does not really own the hardware. Instead ownershipe is
236 : * handled with the help of userspace through an inheritedly racy dance
237 : * to set/unset the VT into raw mode.
238 : *
239 : * Legacy drivers initialize the hardware in the @firstopen callback,
240 : * which isn't even called for modern drivers.
241 : */
242 : void (*lastclose) (struct drm_device *);
243 :
244 : /**
245 : * @unload:
246 : *
247 : * Reverse the effects of the driver load callback. Ideally,
248 : * the clean up performed by the driver should happen in the
249 : * reverse order of the initialization. Similarly to the load
250 : * hook, this handler is deprecated and its usage should be
251 : * dropped in favor of an open-coded teardown function at the
252 : * driver layer. See drm_dev_unregister() and drm_dev_put()
253 : * for the proper way to remove a &struct drm_device.
254 : *
255 : * The unload() hook is called right after unregistering
256 : * the device.
257 : *
258 : */
259 : void (*unload) (struct drm_device *);
260 :
261 : /**
262 : * @release:
263 : *
264 : * Optional callback for destroying device data after the final
265 : * reference is released, i.e. the device is being destroyed.
266 : *
267 : * This is deprecated, clean up all memory allocations associated with a
268 : * &drm_device using drmm_add_action(), drmm_kmalloc() and related
269 : * managed resources functions.
270 : */
271 : void (*release) (struct drm_device *);
272 :
273 : /**
274 : * @master_set:
275 : *
276 : * Called whenever the minor master is set. Only used by vmwgfx.
277 : */
278 : void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
279 : bool from_open);
280 : /**
281 : * @master_drop:
282 : *
283 : * Called whenever the minor master is dropped. Only used by vmwgfx.
284 : */
285 : void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
286 :
287 : /**
288 : * @debugfs_init:
289 : *
290 : * Allows drivers to create driver-specific debugfs files.
291 : */
292 : void (*debugfs_init)(struct drm_minor *minor);
293 :
294 : /**
295 : * @gem_create_object: constructor for gem objects
296 : *
297 : * Hook for allocating the GEM object struct, for use by the CMA
298 : * and SHMEM GEM helpers. Returns a GEM object on success, or an
299 : * ERR_PTR()-encoded error code otherwise.
300 : */
301 : struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
302 : size_t size);
303 :
304 : /**
305 : * @prime_handle_to_fd:
306 : *
307 : * PRIME export function. Only used by vmwgfx.
308 : */
309 : int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
310 : uint32_t handle, uint32_t flags, int *prime_fd);
311 : /**
312 : * @prime_fd_to_handle:
313 : *
314 : * PRIME import function. Only used by vmwgfx.
315 : */
316 : int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
317 : int prime_fd, uint32_t *handle);
318 :
319 : /**
320 : * @gem_prime_import:
321 : *
322 : * Import hook for GEM drivers.
323 : *
324 : * This defaults to drm_gem_prime_import() if not set.
325 : */
326 : struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
327 : struct dma_buf *dma_buf);
328 : /**
329 : * @gem_prime_import_sg_table:
330 : *
331 : * Optional hook used by the PRIME helper functions
332 : * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
333 : */
334 : struct drm_gem_object *(*gem_prime_import_sg_table)(
335 : struct drm_device *dev,
336 : struct dma_buf_attachment *attach,
337 : struct sg_table *sgt);
338 :
339 : /**
340 : * @dumb_create:
341 : *
342 : * This creates a new dumb buffer in the driver's backing storage manager (GEM,
343 : * TTM or something else entirely) and returns the resulting buffer handle. This
344 : * handle can then be wrapped up into a framebuffer modeset object.
345 : *
346 : * Note that userspace is not allowed to use such objects for render
347 : * acceleration - drivers must create their own private ioctls for such a use
348 : * case.
349 : *
350 : * Width, height and depth are specified in the &drm_mode_create_dumb
351 : * argument. The callback needs to fill the handle, pitch and size for
352 : * the created buffer.
353 : *
354 : * Called by the user via ioctl.
355 : *
356 : * Returns:
357 : *
358 : * Zero on success, negative errno on failure.
359 : */
360 : int (*dumb_create)(struct drm_file *file_priv,
361 : struct drm_device *dev,
362 : struct drm_mode_create_dumb *args);
363 : /**
364 : * @dumb_map_offset:
365 : *
366 : * Allocate an offset in the drm device node's address space to be able to
367 : * memory map a dumb buffer.
368 : *
369 : * The default implementation is drm_gem_create_mmap_offset(). GEM based
370 : * drivers must not overwrite this.
371 : *
372 : * Called by the user via ioctl.
373 : *
374 : * Returns:
375 : *
376 : * Zero on success, negative errno on failure.
377 : */
378 : int (*dumb_map_offset)(struct drm_file *file_priv,
379 : struct drm_device *dev, uint32_t handle,
380 : uint64_t *offset);
381 :
382 : /**
383 : * @show_fdinfo:
384 : *
385 : * Print device specific fdinfo. See Documentation/gpu/drm-usage-stats.rst.
386 : */
387 : void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
388 :
389 : /** @major: driver major number */
390 : int major;
391 : /** @minor: driver minor number */
392 : int minor;
393 : /** @patchlevel: driver patch level */
394 : int patchlevel;
395 : /** @name: driver name */
396 : char *name;
397 : /** @desc: driver description */
398 : char *desc;
399 : /** @date: driver date */
400 : char *date;
401 :
402 : /**
403 : * @driver_features:
404 : * Driver features, see &enum drm_driver_feature. Drivers can disable
405 : * some features on a per-instance basis using
406 : * &drm_device.driver_features.
407 : */
408 : u32 driver_features;
409 :
410 : /**
411 : * @ioctls:
412 : *
413 : * Array of driver-private IOCTL description entries. See the chapter on
414 : * :ref:`IOCTL support in the userland interfaces
415 : * chapter<drm_driver_ioctl>` for the full details.
416 : */
417 :
418 : const struct drm_ioctl_desc *ioctls;
419 : /** @num_ioctls: Number of entries in @ioctls. */
420 : int num_ioctls;
421 :
422 : /**
423 : * @fops:
424 : *
425 : * File operations for the DRM device node. See the discussion in
426 : * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
427 : * some examples.
428 : */
429 : const struct file_operations *fops;
430 :
431 : #ifdef CONFIG_DRM_LEGACY
432 : /* Everything below here is for legacy driver, never use! */
433 : /* private: */
434 :
435 : int (*firstopen) (struct drm_device *);
436 : void (*preclose) (struct drm_device *, struct drm_file *file_priv);
437 : int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
438 : int (*dma_quiescent) (struct drm_device *);
439 : int (*context_dtor) (struct drm_device *dev, int context);
440 : irqreturn_t (*irq_handler)(int irq, void *arg);
441 : void (*irq_preinstall)(struct drm_device *dev);
442 : int (*irq_postinstall)(struct drm_device *dev);
443 : void (*irq_uninstall)(struct drm_device *dev);
444 : u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
445 : int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
446 : void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
447 : int dev_priv_size;
448 : #endif
449 : };
450 :
451 : void *__devm_drm_dev_alloc(struct device *parent,
452 : const struct drm_driver *driver,
453 : size_t size, size_t offset);
454 :
455 : /**
456 : * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
457 : * @parent: Parent device object
458 : * @driver: DRM driver
459 : * @type: the type of the struct which contains struct &drm_device
460 : * @member: the name of the &drm_device within @type.
461 : *
462 : * This allocates and initialize a new DRM device. No device registration is done.
463 : * Call drm_dev_register() to advertice the device to user space and register it
464 : * with other core subsystems. This should be done last in the device
465 : * initialization sequence to make sure userspace can't access an inconsistent
466 : * state.
467 : *
468 : * The initial ref-count of the object is 1. Use drm_dev_get() and
469 : * drm_dev_put() to take and drop further ref-counts.
470 : *
471 : * It is recommended that drivers embed &struct drm_device into their own device
472 : * structure.
473 : *
474 : * Note that this manages the lifetime of the resulting &drm_device
475 : * automatically using devres. The DRM device initialized with this function is
476 : * automatically put on driver detach using drm_dev_put().
477 : *
478 : * RETURNS:
479 : * Pointer to new DRM device, or ERR_PTR on failure.
480 : */
481 : #define devm_drm_dev_alloc(parent, driver, type, member) \
482 : ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
483 : offsetof(type, member)))
484 :
485 : struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
486 : struct device *parent);
487 : int drm_dev_register(struct drm_device *dev, unsigned long flags);
488 : void drm_dev_unregister(struct drm_device *dev);
489 :
490 : void drm_dev_get(struct drm_device *dev);
491 : void drm_dev_put(struct drm_device *dev);
492 : void drm_put_dev(struct drm_device *dev);
493 : bool drm_dev_enter(struct drm_device *dev, int *idx);
494 : void drm_dev_exit(int idx);
495 : void drm_dev_unplug(struct drm_device *dev);
496 :
497 : /**
498 : * drm_dev_is_unplugged - is a DRM device unplugged
499 : * @dev: DRM device
500 : *
501 : * This function can be called to check whether a hotpluggable is unplugged.
502 : * Unplugging itself is singalled through drm_dev_unplug(). If a device is
503 : * unplugged, these two functions guarantee that any store before calling
504 : * drm_dev_unplug() is visible to callers of this function after it completes
505 : *
506 : * WARNING: This function fundamentally races against drm_dev_unplug(). It is
507 : * recommended that drivers instead use the underlying drm_dev_enter() and
508 : * drm_dev_exit() function pairs.
509 : */
510 0 : static inline bool drm_dev_is_unplugged(struct drm_device *dev)
511 : {
512 : int idx;
513 :
514 0 : if (drm_dev_enter(dev, &idx)) {
515 0 : drm_dev_exit(idx);
516 0 : return false;
517 : }
518 :
519 : return true;
520 : }
521 :
522 : /**
523 : * drm_core_check_all_features - check driver feature flags mask
524 : * @dev: DRM device to check
525 : * @features: feature flag(s) mask
526 : *
527 : * This checks @dev for driver features, see &drm_driver.driver_features,
528 : * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
529 : *
530 : * Returns true if all features in the @features mask are supported, false
531 : * otherwise.
532 : */
533 : static inline bool drm_core_check_all_features(const struct drm_device *dev,
534 : u32 features)
535 : {
536 125 : u32 supported = dev->driver->driver_features & dev->driver_features;
537 :
538 125 : return features && (supported & features) == features;
539 : }
540 :
541 : /**
542 : * drm_core_check_feature - check driver feature flags
543 : * @dev: DRM device to check
544 : * @feature: feature flag
545 : *
546 : * This checks @dev for driver features, see &drm_driver.driver_features,
547 : * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
548 : *
549 : * Returns true if the @feature is supported, false otherwise.
550 : */
551 : static inline bool drm_core_check_feature(const struct drm_device *dev,
552 : enum drm_driver_feature feature)
553 : {
554 250 : return drm_core_check_all_features(dev, feature);
555 : }
556 :
557 : /**
558 : * drm_drv_uses_atomic_modeset - check if the driver implements
559 : * atomic_commit()
560 : * @dev: DRM device
561 : *
562 : * This check is useful if drivers do not have DRIVER_ATOMIC set but
563 : * have atomic modesetting internally implemented.
564 : */
565 : static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
566 : {
567 37 : return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
568 10 : (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
569 : }
570 :
571 :
572 : /* TODO: Inline drm_firmware_drivers_only() in all its callers. */
573 : static inline bool drm_firmware_drivers_only(void)
574 : {
575 : return video_firmware_drivers_only();
576 : }
577 :
578 : #endif
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