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 	 * @lastclose:
233 	 *
234 	 * Called when the last &struct drm_file has been closed and there's
235 	 * currently no userspace client for the &struct drm_device.
236 	 *
237 	 * Modern drivers should only use this to force-restore the fbdev
238 	 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
239 	 * Anything else would indicate there's something seriously wrong.
240 	 * Modern drivers can also use this to execute delayed power switching
241 	 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
242 	 * infrastructure.
243 	 *
244 	 * This is called after @postclose hook has been called.
245 	 *
246 	 * NOTE:
247 	 *
248 	 * All legacy drivers use this callback to de-initialize the hardware.
249 	 * This is purely because of the shadow-attach model, where the DRM
250 	 * kernel driver does not really own the hardware. Instead ownershipe is
251 	 * handled with the help of userspace through an inheritedly racy dance
252 	 * to set/unset the VT into raw mode.
253 	 *
254 	 * Legacy drivers initialize the hardware in the @firstopen callback,
255 	 * which isn't even called for modern drivers.
256 	 */
257 	void (*lastclose) (struct drm_device *);
258 
259 	/**
260 	 * @unload:
261 	 *
262 	 * Reverse the effects of the driver load callback.  Ideally,
263 	 * the clean up performed by the driver should happen in the
264 	 * reverse order of the initialization.  Similarly to the load
265 	 * hook, this handler is deprecated and its usage should be
266 	 * dropped in favor of an open-coded teardown function at the
267 	 * driver layer.  See drm_dev_unregister() and drm_dev_put()
268 	 * for the proper way to remove a &struct drm_device.
269 	 *
270 	 * The unload() hook is called right after unregistering
271 	 * the device.
272 	 *
273 	 */
274 	void (*unload) (struct drm_device *);
275 
276 	/**
277 	 * @release:
278 	 *
279 	 * Optional callback for destroying device data after the final
280 	 * reference is released, i.e. the device is being destroyed.
281 	 *
282 	 * This is deprecated, clean up all memory allocations associated with a
283 	 * &drm_device using drmm_add_action(), drmm_kmalloc() and related
284 	 * managed resources functions.
285 	 */
286 	void (*release) (struct drm_device *);
287 
288 	/**
289 	 * @master_set:
290 	 *
291 	 * Called whenever the minor master is set. Only used by vmwgfx.
292 	 */
293 	void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
294 			   bool from_open);
295 	/**
296 	 * @master_drop:
297 	 *
298 	 * Called whenever the minor master is dropped. Only used by vmwgfx.
299 	 */
300 	void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
301 
302 	/**
303 	 * @debugfs_init:
304 	 *
305 	 * Allows drivers to create driver-specific debugfs files.
306 	 */
307 	void (*debugfs_init)(struct drm_minor *minor);
308 
309 	/**
310 	 * @gem_create_object: constructor for gem objects
311 	 *
312 	 * Hook for allocating the GEM object struct, for use by the CMA
313 	 * and SHMEM GEM helpers. Returns a GEM object on success, or an
314 	 * ERR_PTR()-encoded error code otherwise.
315 	 */
316 	struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
317 						    size_t size);
318 
319 	/**
320 	 * @prime_handle_to_fd:
321 	 *
322 	 * PRIME export function. Only used by vmwgfx.
323 	 */
324 	int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
325 				uint32_t handle, uint32_t flags, int *prime_fd);
326 	/**
327 	 * @prime_fd_to_handle:
328 	 *
329 	 * PRIME import function. Only used by vmwgfx.
330 	 */
331 	int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
332 				int prime_fd, uint32_t *handle);
333 
334 	/**
335 	 * @gem_prime_import:
336 	 *
337 	 * Import hook for GEM drivers.
338 	 *
339 	 * This defaults to drm_gem_prime_import() if not set.
340 	 */
341 	struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
342 				struct dma_buf *dma_buf);
343 	/**
344 	 * @gem_prime_import_sg_table:
345 	 *
346 	 * Optional hook used by the PRIME helper functions
347 	 * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
348 	 */
349 	struct drm_gem_object *(*gem_prime_import_sg_table)(
350 				struct drm_device *dev,
351 				struct dma_buf_attachment *attach,
352 				struct sg_table *sgt);
353 
354 	/**
355 	 * @dumb_create:
356 	 *
357 	 * This creates a new dumb buffer in the driver's backing storage manager (GEM,
358 	 * TTM or something else entirely) and returns the resulting buffer handle. This
359 	 * handle can then be wrapped up into a framebuffer modeset object.
360 	 *
361 	 * Note that userspace is not allowed to use such objects for render
362 	 * acceleration - drivers must create their own private ioctls for such a use
363 	 * case.
364 	 *
365 	 * Width, height and depth are specified in the &drm_mode_create_dumb
366 	 * argument. The callback needs to fill the handle, pitch and size for
367 	 * the created buffer.
368 	 *
369 	 * Called by the user via ioctl.
370 	 *
371 	 * Returns:
372 	 *
373 	 * Zero on success, negative errno on failure.
374 	 */
375 	int (*dumb_create)(struct drm_file *file_priv,
376 			   struct drm_device *dev,
377 			   struct drm_mode_create_dumb *args);
378 	/**
379 	 * @dumb_map_offset:
380 	 *
381 	 * Allocate an offset in the drm device node's address space to be able to
382 	 * memory map a dumb buffer.
383 	 *
384 	 * The default implementation is drm_gem_create_mmap_offset(). GEM based
385 	 * drivers must not overwrite this.
386 	 *
387 	 * Called by the user via ioctl.
388 	 *
389 	 * Returns:
390 	 *
391 	 * Zero on success, negative errno on failure.
392 	 */
393 	int (*dumb_map_offset)(struct drm_file *file_priv,
394 			       struct drm_device *dev, uint32_t handle,
395 			       uint64_t *offset);
396 
397 	/**
398 	 * @show_fdinfo:
399 	 *
400 	 * Print device specific fdinfo.  See Documentation/gpu/drm-usage-stats.rst.
401 	 */
402 	void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
403 
404 	/** @major: driver major number */
405 	int major;
406 	/** @minor: driver minor number */
407 	int minor;
408 	/** @patchlevel: driver patch level */
409 	int patchlevel;
410 	/** @name: driver name */
411 	char *name;
412 	/** @desc: driver description */
413 	char *desc;
414 	/** @date: driver date */
415 	char *date;
416 
417 	/**
418 	 * @driver_features:
419 	 * Driver features, see &enum drm_driver_feature. Drivers can disable
420 	 * some features on a per-instance basis using
421 	 * &drm_device.driver_features.
422 	 */
423 	u32 driver_features;
424 
425 	/**
426 	 * @ioctls:
427 	 *
428 	 * Array of driver-private IOCTL description entries. See the chapter on
429 	 * :ref:`IOCTL support in the userland interfaces
430 	 * chapter<drm_driver_ioctl>` for the full details.
431 	 */
432 
433 	const struct drm_ioctl_desc *ioctls;
434 	/** @num_ioctls: Number of entries in @ioctls. */
435 	int num_ioctls;
436 
437 	/**
438 	 * @fops:
439 	 *
440 	 * File operations for the DRM device node. See the discussion in
441 	 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
442 	 * some examples.
443 	 */
444 	const struct file_operations *fops;
445 
446 #ifdef CONFIG_DRM_LEGACY
447 	/* Everything below here is for legacy driver, never use! */
448 	/* private: */
449 
450 	int (*firstopen) (struct drm_device *);
451 	void (*preclose) (struct drm_device *, struct drm_file *file_priv);
452 	int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
453 	int (*dma_quiescent) (struct drm_device *);
454 	int (*context_dtor) (struct drm_device *dev, int context);
455 	irqreturn_t (*irq_handler)(int irq, void *arg);
456 	void (*irq_preinstall)(struct drm_device *dev);
457 	int (*irq_postinstall)(struct drm_device *dev);
458 	void (*irq_uninstall)(struct drm_device *dev);
459 	u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
460 	int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
461 	void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
462 	int dev_priv_size;
463 #endif
464 };
465 
466 void *__devm_drm_dev_alloc(struct device *parent,
467 			   const struct drm_driver *driver,
468 			   size_t size, size_t offset);
469 
470 /**
471  * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
472  * @parent: Parent device object
473  * @driver: DRM driver
474  * @type: the type of the struct which contains struct &drm_device
475  * @member: the name of the &drm_device within @type.
476  *
477  * This allocates and initialize a new DRM device. No device registration is done.
478  * Call drm_dev_register() to advertice the device to user space and register it
479  * with other core subsystems. This should be done last in the device
480  * initialization sequence to make sure userspace can't access an inconsistent
481  * state.
482  *
483  * The initial ref-count of the object is 1. Use drm_dev_get() and
484  * drm_dev_put() to take and drop further ref-counts.
485  *
486  * It is recommended that drivers embed &struct drm_device into their own device
487  * structure.
488  *
489  * Note that this manages the lifetime of the resulting &drm_device
490  * automatically using devres. The DRM device initialized with this function is
491  * automatically put on driver detach using drm_dev_put().
492  *
493  * RETURNS:
494  * Pointer to new DRM device, or ERR_PTR on failure.
495  */
496 #define devm_drm_dev_alloc(parent, driver, type, member) \
497 	((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
498 				       offsetof(type, member)))
499 
500 struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
501 				 struct device *parent);
502 int drm_dev_register(struct drm_device *dev, unsigned long flags);
503 void drm_dev_unregister(struct drm_device *dev);
504 
505 void drm_dev_get(struct drm_device *dev);
506 void drm_dev_put(struct drm_device *dev);
507 void drm_put_dev(struct drm_device *dev);
508 bool drm_dev_enter(struct drm_device *dev, int *idx);
509 void drm_dev_exit(int idx);
510 void drm_dev_unplug(struct drm_device *dev);
511 
512 /**
513  * drm_dev_is_unplugged - is a DRM device unplugged
514  * @dev: DRM device
515  *
516  * This function can be called to check whether a hotpluggable is unplugged.
517  * Unplugging itself is singalled through drm_dev_unplug(). If a device is
518  * unplugged, these two functions guarantee that any store before calling
519  * drm_dev_unplug() is visible to callers of this function after it completes
520  *
521  * WARNING: This function fundamentally races against drm_dev_unplug(). It is
522  * recommended that drivers instead use the underlying drm_dev_enter() and
523  * drm_dev_exit() function pairs.
524  */
drm_dev_is_unplugged(struct drm_device * dev)525 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
526 {
527 	int idx;
528 
529 	if (drm_dev_enter(dev, &idx)) {
530 		drm_dev_exit(idx);
531 		return false;
532 	}
533 
534 	return true;
535 }
536 
537 /**
538  * drm_core_check_all_features - check driver feature flags mask
539  * @dev: DRM device to check
540  * @features: feature flag(s) mask
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 all features in the @features mask are supported, false
546  * otherwise.
547  */
drm_core_check_all_features(const struct drm_device * dev,u32 features)548 static inline bool drm_core_check_all_features(const struct drm_device *dev,
549 					       u32 features)
550 {
551 	u32 supported = dev->driver->driver_features & dev->driver_features;
552 
553 	return features && (supported & features) == features;
554 }
555 
556 /**
557  * drm_core_check_feature - check driver feature flags
558  * @dev: DRM device to check
559  * @feature: feature flag
560  *
561  * This checks @dev for driver features, see &drm_driver.driver_features,
562  * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
563  *
564  * Returns true if the @feature is supported, false otherwise.
565  */
drm_core_check_feature(const struct drm_device * dev,enum drm_driver_feature feature)566 static inline bool drm_core_check_feature(const struct drm_device *dev,
567 					  enum drm_driver_feature feature)
568 {
569 	return drm_core_check_all_features(dev, feature);
570 }
571 
572 /**
573  * drm_drv_uses_atomic_modeset - check if the driver implements
574  * atomic_commit()
575  * @dev: DRM device
576  *
577  * This check is useful if drivers do not have DRIVER_ATOMIC set but
578  * have atomic modesetting internally implemented.
579  */
drm_drv_uses_atomic_modeset(struct drm_device * dev)580 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
581 {
582 	return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
583 		(dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
584 }
585 
586 
587 /* TODO: Inline drm_firmware_drivers_only() in all its callers. */
drm_firmware_drivers_only(void)588 static inline bool drm_firmware_drivers_only(void)
589 {
590 	return video_firmware_drivers_only();
591 }
592 
593 #endif
594