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TOMOYO Linux Cross Reference
Linux/include/drm/drm_drv.h

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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 <drm/drm_device.h>
 34 
 35 struct drm_file;
 36 struct drm_gem_object;
 37 struct drm_master;
 38 struct drm_minor;
 39 struct dma_buf_attachment;
 40 struct drm_display_mode;
 41 struct drm_mode_create_dumb;
 42 struct drm_printer;
 43 
 44 /* driver capabilities and requirements mask */
 45 #define DRIVER_USE_AGP                  0x1
 46 #define DRIVER_LEGACY                   0x2
 47 #define DRIVER_PCI_DMA                  0x8
 48 #define DRIVER_SG                       0x10
 49 #define DRIVER_HAVE_DMA                 0x20
 50 #define DRIVER_HAVE_IRQ                 0x40
 51 #define DRIVER_IRQ_SHARED               0x80
 52 #define DRIVER_GEM                      0x1000
 53 #define DRIVER_MODESET                  0x2000
 54 #define DRIVER_PRIME                    0x4000
 55 #define DRIVER_RENDER                   0x8000
 56 #define DRIVER_ATOMIC                   0x10000
 57 #define DRIVER_KMS_LEGACY_CONTEXT       0x20000
 58 #define DRIVER_SYNCOBJ                  0x40000
 59 #define DRIVER_PREFER_XBGR_30BPP        0x80000
 60 
 61 /**
 62  * struct drm_driver - DRM driver structure
 63  *
 64  * This structure represent the common code for a family of cards. There will
 65  * one drm_device for each card present in this family. It contains lots of
 66  * vfunc entries, and a pile of those probably should be moved to more
 67  * appropriate places like &drm_mode_config_funcs or into a new operations
 68  * structure for GEM drivers.
 69  */
 70 struct drm_driver {
 71         /**
 72          * @load:
 73          *
 74          * Backward-compatible driver callback to complete
 75          * initialization steps after the driver is registered.  For
 76          * this reason, may suffer from race conditions and its use is
 77          * deprecated for new drivers.  It is therefore only supported
 78          * for existing drivers not yet converted to the new scheme.
 79          * See drm_dev_init() and drm_dev_register() for proper and
 80          * race-free way to set up a &struct drm_device.
 81          *
 82          * This is deprecated, do not use!
 83          *
 84          * Returns:
 85          *
 86          * Zero on success, non-zero value on failure.
 87          */
 88         int (*load) (struct drm_device *, unsigned long flags);
 89 
 90         /**
 91          * @open:
 92          *
 93          * Driver callback when a new &struct drm_file is opened. Useful for
 94          * setting up driver-private data structures like buffer allocators,
 95          * execution contexts or similar things. Such driver-private resources
 96          * must be released again in @postclose.
 97          *
 98          * Since the display/modeset side of DRM can only be owned by exactly
 99          * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
100          * there should never be a need to set up any modeset related resources
101          * in this callback. Doing so would be a driver design bug.
102          *
103          * Returns:
104          *
105          * 0 on success, a negative error code on failure, which will be
106          * promoted to userspace as the result of the open() system call.
107          */
108         int (*open) (struct drm_device *, struct drm_file *);
109 
110         /**
111          * @postclose:
112          *
113          * One of the driver callbacks when a new &struct drm_file is closed.
114          * Useful for tearing down driver-private data structures allocated in
115          * @open like buffer allocators, execution contexts or similar things.
116          *
117          * Since the display/modeset side of DRM can only be owned by exactly
118          * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
119          * there should never be a need to tear down any modeset related
120          * resources in this callback. Doing so would be a driver design bug.
121          */
122         void (*postclose) (struct drm_device *, struct drm_file *);
123 
124         /**
125          * @lastclose:
126          *
127          * Called when the last &struct drm_file has been closed and there's
128          * currently no userspace client for the &struct drm_device.
129          *
130          * Modern drivers should only use this to force-restore the fbdev
131          * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
132          * Anything else would indicate there's something seriously wrong.
133          * Modern drivers can also use this to execute delayed power switching
134          * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
135          * infrastructure.
136          *
137          * This is called after @postclose hook has been called.
138          *
139          * NOTE:
140          *
141          * All legacy drivers use this callback to de-initialize the hardware.
142          * This is purely because of the shadow-attach model, where the DRM
143          * kernel driver does not really own the hardware. Instead ownershipe is
144          * handled with the help of userspace through an inheritedly racy dance
145          * to set/unset the VT into raw mode.
146          *
147          * Legacy drivers initialize the hardware in the @firstopen callback,
148          * which isn't even called for modern drivers.
149          */
150         void (*lastclose) (struct drm_device *);
151 
152         /**
153          * @unload:
154          *
155          * Reverse the effects of the driver load callback.  Ideally,
156          * the clean up performed by the driver should happen in the
157          * reverse order of the initialization.  Similarly to the load
158          * hook, this handler is deprecated and its usage should be
159          * dropped in favor of an open-coded teardown function at the
160          * driver layer.  See drm_dev_unregister() and drm_dev_put()
161          * for the proper way to remove a &struct drm_device.
162          *
163          * The unload() hook is called right after unregistering
164          * the device.
165          *
166          */
167         void (*unload) (struct drm_device *);
168 
169         /**
170          * @release:
171          *
172          * Optional callback for destroying device data after the final
173          * reference is released, i.e. the device is being destroyed. Drivers
174          * using this callback are responsible for calling drm_dev_fini()
175          * to finalize the device and then freeing the struct themselves.
176          */
177         void (*release) (struct drm_device *);
178 
179         /**
180          * @get_vblank_counter:
181          *
182          * Driver callback for fetching a raw hardware vblank counter for the
183          * CRTC specified with the pipe argument.  If a device doesn't have a
184          * hardware counter, the driver can simply leave the hook as NULL.
185          * The DRM core will account for missed vblank events while interrupts
186          * where disabled based on system timestamps.
187          *
188          * Wraparound handling and loss of events due to modesetting is dealt
189          * with in the DRM core code, as long as drivers call
190          * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
191          * enabling a CRTC.
192          *
193          * This is deprecated and should not be used by new drivers.
194          * Use &drm_crtc_funcs.get_vblank_counter instead.
195          *
196          * Returns:
197          *
198          * Raw vblank counter value.
199          */
200         u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
201 
202         /**
203          * @enable_vblank:
204          *
205          * Enable vblank interrupts for the CRTC specified with the pipe
206          * argument.
207          *
208          * This is deprecated and should not be used by new drivers.
209          * Use &drm_crtc_funcs.enable_vblank instead.
210          *
211          * Returns:
212          *
213          * Zero on success, appropriate errno if the given @crtc's vblank
214          * interrupt cannot be enabled.
215          */
216         int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
217 
218         /**
219          * @disable_vblank:
220          *
221          * Disable vblank interrupts for the CRTC specified with the pipe
222          * argument.
223          *
224          * This is deprecated and should not be used by new drivers.
225          * Use &drm_crtc_funcs.disable_vblank instead.
226          */
227         void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
228 
229         /**
230          * @get_scanout_position:
231          *
232          * Called by vblank timestamping code.
233          *
234          * Returns the current display scanout position from a crtc, and an
235          * optional accurate ktime_get() timestamp of when position was
236          * measured. Note that this is a helper callback which is only used if a
237          * driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
238          * @get_vblank_timestamp callback.
239          *
240          * Parameters:
241          *
242          * dev:
243          *     DRM device.
244          * pipe:
245          *     Id of the crtc to query.
246          * in_vblank_irq:
247          *     True when called from drm_crtc_handle_vblank().  Some drivers
248          *     need to apply some workarounds for gpu-specific vblank irq quirks
249          *     if flag is set.
250          * vpos:
251          *     Target location for current vertical scanout position.
252          * hpos:
253          *     Target location for current horizontal scanout position.
254          * stime:
255          *     Target location for timestamp taken immediately before
256          *     scanout position query. Can be NULL to skip timestamp.
257          * etime:
258          *     Target location for timestamp taken immediately after
259          *     scanout position query. Can be NULL to skip timestamp.
260          * mode:
261          *     Current display timings.
262          *
263          * Returns vpos as a positive number while in active scanout area.
264          * Returns vpos as a negative number inside vblank, counting the number
265          * of scanlines to go until end of vblank, e.g., -1 means "one scanline
266          * until start of active scanout / end of vblank."
267          *
268          * Returns:
269          *
270          * True on success, false if a reliable scanout position counter could
271          * not be read out.
272          *
273          * FIXME:
274          *
275          * Since this is a helper to implement @get_vblank_timestamp, we should
276          * move it to &struct drm_crtc_helper_funcs, like all the other
277          * helper-internal hooks.
278          */
279         bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
280                                       bool in_vblank_irq, int *vpos, int *hpos,
281                                       ktime_t *stime, ktime_t *etime,
282                                       const struct drm_display_mode *mode);
283 
284         /**
285          * @get_vblank_timestamp:
286          *
287          * Called by drm_get_last_vbltimestamp(). Should return a precise
288          * timestamp when the most recent VBLANK interval ended or will end.
289          *
290          * Specifically, the timestamp in @vblank_time should correspond as
291          * closely as possible to the time when the first video scanline of
292          * the video frame after the end of VBLANK will start scanning out,
293          * the time immediately after end of the VBLANK interval. If the
294          * @crtc is currently inside VBLANK, this will be a time in the future.
295          * If the @crtc is currently scanning out a frame, this will be the
296          * past start time of the current scanout. This is meant to adhere
297          * to the OpenML OML_sync_control extension specification.
298          *
299          * Paramters:
300          *
301          * dev:
302          *     dev DRM device handle.
303          * pipe:
304          *     crtc for which timestamp should be returned.
305          * max_error:
306          *     Maximum allowable timestamp error in nanoseconds.
307          *     Implementation should strive to provide timestamp
308          *     with an error of at most max_error nanoseconds.
309          *     Returns true upper bound on error for timestamp.
310          * vblank_time:
311          *     Target location for returned vblank timestamp.
312          * in_vblank_irq:
313          *     True when called from drm_crtc_handle_vblank().  Some drivers
314          *     need to apply some workarounds for gpu-specific vblank irq quirks
315          *     if flag is set.
316          *
317          * Returns:
318          *
319          * True on success, false on failure, which means the core should
320          * fallback to a simple timestamp taken in drm_crtc_handle_vblank().
321          *
322          * FIXME:
323          *
324          * We should move this hook to &struct drm_crtc_funcs like all the other
325          * vblank hooks.
326          */
327         bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
328                                      int *max_error,
329                                      ktime_t *vblank_time,
330                                      bool in_vblank_irq);
331 
332         /**
333          * @irq_handler:
334          *
335          * Interrupt handler called when using drm_irq_install(). Not used by
336          * drivers which implement their own interrupt handling.
337          */
338         irqreturn_t(*irq_handler) (int irq, void *arg);
339 
340         /**
341          * @irq_preinstall:
342          *
343          * Optional callback used by drm_irq_install() which is called before
344          * the interrupt handler is registered. This should be used to clear out
345          * any pending interrupts (from e.g. firmware based drives) and reset
346          * the interrupt handling registers.
347          */
348         void (*irq_preinstall) (struct drm_device *dev);
349 
350         /**
351          * @irq_postinstall:
352          *
353          * Optional callback used by drm_irq_install() which is called after
354          * the interrupt handler is registered. This should be used to enable
355          * interrupt generation in the hardware.
356          */
357         int (*irq_postinstall) (struct drm_device *dev);
358 
359         /**
360          * @irq_uninstall:
361          *
362          * Optional callback used by drm_irq_uninstall() which is called before
363          * the interrupt handler is unregistered. This should be used to disable
364          * interrupt generation in the hardware.
365          */
366         void (*irq_uninstall) (struct drm_device *dev);
367 
368         /**
369          * @master_create:
370          *
371          * Called whenever a new master is created. Only used by vmwgfx.
372          */
373         int (*master_create)(struct drm_device *dev, struct drm_master *master);
374 
375         /**
376          * @master_destroy:
377          *
378          * Called whenever a master is destroyed. Only used by vmwgfx.
379          */
380         void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
381 
382         /**
383          * @master_set:
384          *
385          * Called whenever the minor master is set. Only used by vmwgfx.
386          */
387         int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
388                           bool from_open);
389         /**
390          * @master_drop:
391          *
392          * Called whenever the minor master is dropped. Only used by vmwgfx.
393          */
394         void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
395 
396         /**
397          * @debugfs_init:
398          *
399          * Allows drivers to create driver-specific debugfs files.
400          */
401         int (*debugfs_init)(struct drm_minor *minor);
402 
403         /**
404          * @gem_free_object: deconstructor for drm_gem_objects
405          *
406          * This is deprecated and should not be used by new drivers. Use
407          * @gem_free_object_unlocked instead.
408          */
409         void (*gem_free_object) (struct drm_gem_object *obj);
410 
411         /**
412          * @gem_free_object_unlocked: deconstructor for drm_gem_objects
413          *
414          * This is for drivers which are not encumbered with &drm_device.struct_mutex
415          * legacy locking schemes. Use this hook instead of @gem_free_object.
416          */
417         void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
418 
419         /**
420          * @gem_open_object:
421          *
422          * Driver hook called upon gem handle creation
423          */
424         int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
425 
426         /**
427          * @gem_close_object:
428          *
429          * Driver hook called upon gem handle release
430          */
431         void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
432 
433         /**
434          * @gem_print_info:
435          *
436          * If driver subclasses struct &drm_gem_object, it can implement this
437          * optional hook for printing additional driver specific info.
438          *
439          * drm_printf_indent() should be used in the callback passing it the
440          * indent argument.
441          *
442          * This callback is called from drm_gem_print_info().
443          */
444         void (*gem_print_info)(struct drm_printer *p, unsigned int indent,
445                                const struct drm_gem_object *obj);
446 
447         /**
448          * @gem_create_object: constructor for gem objects
449          *
450          * Hook for allocating the GEM object struct, for use by core
451          * helpers.
452          */
453         struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
454                                                     size_t size);
455 
456         /* prime: */
457         /**
458          * @prime_handle_to_fd:
459          *
460          * export handle -> fd (see drm_gem_prime_handle_to_fd() helper)
461          */
462         int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
463                                 uint32_t handle, uint32_t flags, int *prime_fd);
464         /**
465          * @prime_fd_to_handle:
466          *
467          * import fd -> handle (see drm_gem_prime_fd_to_handle() helper)
468          */
469         int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
470                                 int prime_fd, uint32_t *handle);
471         /**
472          * @gem_prime_export:
473          *
474          * export GEM -> dmabuf
475          */
476         struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
477                                 struct drm_gem_object *obj, int flags);
478         /**
479          * @gem_prime_import:
480          *
481          * import dmabuf -> GEM
482          */
483         struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
484                                 struct dma_buf *dma_buf);
485         int (*gem_prime_pin)(struct drm_gem_object *obj);
486         void (*gem_prime_unpin)(struct drm_gem_object *obj);
487         struct reservation_object * (*gem_prime_res_obj)(
488                                 struct drm_gem_object *obj);
489         struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
490         struct drm_gem_object *(*gem_prime_import_sg_table)(
491                                 struct drm_device *dev,
492                                 struct dma_buf_attachment *attach,
493                                 struct sg_table *sgt);
494         void *(*gem_prime_vmap)(struct drm_gem_object *obj);
495         void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
496         int (*gem_prime_mmap)(struct drm_gem_object *obj,
497                                 struct vm_area_struct *vma);
498 
499         /**
500          * @dumb_create:
501          *
502          * This creates a new dumb buffer in the driver's backing storage manager (GEM,
503          * TTM or something else entirely) and returns the resulting buffer handle. This
504          * handle can then be wrapped up into a framebuffer modeset object.
505          *
506          * Note that userspace is not allowed to use such objects for render
507          * acceleration - drivers must create their own private ioctls for such a use
508          * case.
509          *
510          * Width, height and depth are specified in the &drm_mode_create_dumb
511          * argument. The callback needs to fill the handle, pitch and size for
512          * the created buffer.
513          *
514          * Called by the user via ioctl.
515          *
516          * Returns:
517          *
518          * Zero on success, negative errno on failure.
519          */
520         int (*dumb_create)(struct drm_file *file_priv,
521                            struct drm_device *dev,
522                            struct drm_mode_create_dumb *args);
523         /**
524          * @dumb_map_offset:
525          *
526          * Allocate an offset in the drm device node's address space to be able to
527          * memory map a dumb buffer. GEM-based drivers must use
528          * drm_gem_create_mmap_offset() to implement this.
529          *
530          * Called by the user via ioctl.
531          *
532          * Returns:
533          *
534          * Zero on success, negative errno on failure.
535          */
536         int (*dumb_map_offset)(struct drm_file *file_priv,
537                                struct drm_device *dev, uint32_t handle,
538                                uint64_t *offset);
539         /**
540          * @dumb_destroy:
541          *
542          * This destroys the userspace handle for the given dumb backing storage buffer.
543          * Since buffer objects must be reference counted in the kernel a buffer object
544          * won't be immediately freed if a framebuffer modeset object still uses it.
545          *
546          * Called by the user via ioctl.
547          *
548          * Returns:
549          *
550          * Zero on success, negative errno on failure.
551          */
552         int (*dumb_destroy)(struct drm_file *file_priv,
553                             struct drm_device *dev,
554                             uint32_t handle);
555 
556         /**
557          * @gem_vm_ops: Driver private ops for this object
558          */
559         const struct vm_operations_struct *gem_vm_ops;
560 
561         /** @major: driver major number */
562         int major;
563         /** @minor: driver minor number */
564         int minor;
565         /** @patchlevel: driver patch level */
566         int patchlevel;
567         /** @name: driver name */
568         char *name;
569         /** @desc: driver description */
570         char *desc;
571         /** @date: driver date */
572         char *date;
573 
574         /** @driver_features: driver features */
575         u32 driver_features;
576 
577         /**
578          * @ioctls:
579          *
580          * Array of driver-private IOCTL description entries. See the chapter on
581          * :ref:`IOCTL support in the userland interfaces
582          * chapter<drm_driver_ioctl>` for the full details.
583          */
584 
585         const struct drm_ioctl_desc *ioctls;
586         /** @num_ioctls: Number of entries in @ioctls. */
587         int num_ioctls;
588 
589         /**
590          * @fops:
591          *
592          * File operations for the DRM device node. See the discussion in
593          * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
594          * some examples.
595          */
596         const struct file_operations *fops;
597 
598         /* Everything below here is for legacy driver, never use! */
599         /* private: */
600 
601         /* List of devices hanging off this driver with stealth attach. */
602         struct list_head legacy_dev_list;
603         int (*firstopen) (struct drm_device *);
604         void (*preclose) (struct drm_device *, struct drm_file *file_priv);
605         int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
606         int (*dma_quiescent) (struct drm_device *);
607         int (*context_dtor) (struct drm_device *dev, int context);
608         int dev_priv_size;
609 };
610 
611 extern unsigned int drm_debug;
612 
613 int drm_dev_init(struct drm_device *dev,
614                  struct drm_driver *driver,
615                  struct device *parent);
616 void drm_dev_fini(struct drm_device *dev);
617 
618 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
619                                  struct device *parent);
620 int drm_dev_register(struct drm_device *dev, unsigned long flags);
621 void drm_dev_unregister(struct drm_device *dev);
622 
623 void drm_dev_get(struct drm_device *dev);
624 void drm_dev_put(struct drm_device *dev);
625 void drm_dev_unref(struct drm_device *dev);
626 void drm_put_dev(struct drm_device *dev);
627 void drm_dev_unplug(struct drm_device *dev);
628 
629 /**
630  * drm_dev_is_unplugged - is a DRM device unplugged
631  * @dev: DRM device
632  *
633  * This function can be called to check whether a hotpluggable is unplugged.
634  * Unplugging itself is singalled through drm_dev_unplug(). If a device is
635  * unplugged, these two functions guarantee that any store before calling
636  * drm_dev_unplug() is visible to callers of this function after it completes
637  */
638 static inline int drm_dev_is_unplugged(struct drm_device *dev)
639 {
640         int ret = atomic_read(&dev->unplugged);
641         smp_rmb();
642         return ret;
643 }
644 
645 
646 int drm_dev_set_unique(struct drm_device *dev, const char *name);
647 
648 
649 #endif
650 

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