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

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  1 /*
  2  * Internal Header for the Direct Rendering Manager
  3  *
  4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  6  * Copyright (c) 2009-2010, Code Aurora Forum.
  7  * All rights reserved.
  8  *
  9  * Author: Rickard E. (Rik) Faith <faith@valinux.com>
 10  * Author: Gareth Hughes <gareth@valinux.com>
 11  *
 12  * Permission is hereby granted, free of charge, to any person obtaining a
 13  * copy of this software and associated documentation files (the "Software"),
 14  * to deal in the Software without restriction, including without limitation
 15  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 16  * and/or sell copies of the Software, and to permit persons to whom the
 17  * Software is furnished to do so, subject to the following conditions:
 18  *
 19  * The above copyright notice and this permission notice (including the next
 20  * paragraph) shall be included in all copies or substantial portions of the
 21  * Software.
 22  *
 23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 26  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 27  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 28  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 29  * OTHER DEALINGS IN THE SOFTWARE.
 30  */
 31 
 32 #ifndef _DRM_P_H_
 33 #define _DRM_P_H_
 34 
 35 #include <linux/agp_backend.h>
 36 #include <linux/cdev.h>
 37 #include <linux/dma-mapping.h>
 38 #include <linux/file.h>
 39 #include <linux/fs.h>
 40 #include <linux/highmem.h>
 41 #include <linux/idr.h>
 42 #include <linux/init.h>
 43 #include <linux/io.h>
 44 #include <linux/jiffies.h>
 45 #include <linux/kernel.h>
 46 #include <linux/kref.h>
 47 #include <linux/miscdevice.h>
 48 #include <linux/mm.h>
 49 #include <linux/mutex.h>
 50 #include <linux/pci.h>
 51 #include <linux/platform_device.h>
 52 #include <linux/poll.h>
 53 #include <linux/ratelimit.h>
 54 #include <linux/sched.h>
 55 #include <linux/slab.h>
 56 #include <linux/types.h>
 57 #include <linux/vmalloc.h>
 58 #include <linux/workqueue.h>
 59 
 60 #include <asm/mman.h>
 61 #include <asm/pgalloc.h>
 62 #include <asm/uaccess.h>
 63 
 64 #include <uapi/drm/drm.h>
 65 #include <uapi/drm/drm_mode.h>
 66 
 67 #include <drm/drm_agpsupport.h>
 68 #include <drm/drm_crtc.h>
 69 #include <drm/drm_global.h>
 70 #include <drm/drm_hashtab.h>
 71 #include <drm/drm_mem_util.h>
 72 #include <drm/drm_mm.h>
 73 #include <drm/drm_os_linux.h>
 74 #include <drm/drm_sarea.h>
 75 #include <drm/drm_vma_manager.h>
 76 
 77 struct module;
 78 
 79 struct drm_file;
 80 struct drm_device;
 81 struct drm_agp_head;
 82 struct drm_local_map;
 83 struct drm_device_dma;
 84 struct drm_dma_handle;
 85 struct drm_gem_object;
 86 
 87 struct device_node;
 88 struct videomode;
 89 struct reservation_object;
 90 struct dma_buf_attachment;
 91 
 92 /*
 93  * 4 debug categories are defined:
 94  *
 95  * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
 96  *       This is the category used by the DRM_DEBUG() macro.
 97  *
 98  * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
 99  *         This is the category used by the DRM_DEBUG_DRIVER() macro.
100  *
101  * KMS: used in the modesetting code.
102  *      This is the category used by the DRM_DEBUG_KMS() macro.
103  *
104  * PRIME: used in the prime code.
105  *        This is the category used by the DRM_DEBUG_PRIME() macro.
106  *
107  * ATOMIC: used in the atomic code.
108  *        This is the category used by the DRM_DEBUG_ATOMIC() macro.
109  *
110  * VBL: used for verbose debug message in the vblank code
111  *        This is the category used by the DRM_DEBUG_VBL() macro.
112  *
113  * Enabling verbose debug messages is done through the drm.debug parameter,
114  * each category being enabled by a bit.
115  *
116  * drm.debug=0x1 will enable CORE messages
117  * drm.debug=0x2 will enable DRIVER messages
118  * drm.debug=0x3 will enable CORE and DRIVER messages
119  * ...
120  * drm.debug=0x3f will enable all messages
121  *
122  * An interesting feature is that it's possible to enable verbose logging at
123  * run-time by echoing the debug value in its sysfs node:
124  *   # echo 0xf > /sys/module/drm/parameters/debug
125  */
126 #define DRM_UT_CORE             0x01
127 #define DRM_UT_DRIVER           0x02
128 #define DRM_UT_KMS              0x04
129 #define DRM_UT_PRIME            0x08
130 #define DRM_UT_ATOMIC           0x10
131 #define DRM_UT_VBL              0x20
132 
133 extern __printf(2, 3)
134 void drm_ut_debug_printk(const char *function_name,
135                          const char *format, ...);
136 extern __printf(1, 2)
137 void drm_err(const char *format, ...);
138 
139 /***********************************************************************/
140 /** \name DRM template customization defaults */
141 /*@{*/
142 
143 /* driver capabilities and requirements mask */
144 #define DRIVER_USE_AGP                  0x1
145 #define DRIVER_PCI_DMA                  0x8
146 #define DRIVER_SG                       0x10
147 #define DRIVER_HAVE_DMA                 0x20
148 #define DRIVER_HAVE_IRQ                 0x40
149 #define DRIVER_IRQ_SHARED               0x80
150 #define DRIVER_GEM                      0x1000
151 #define DRIVER_MODESET                  0x2000
152 #define DRIVER_PRIME                    0x4000
153 #define DRIVER_RENDER                   0x8000
154 #define DRIVER_ATOMIC                   0x10000
155 #define DRIVER_KMS_LEGACY_CONTEXT       0x20000
156 
157 /***********************************************************************/
158 /** \name Macros to make printk easier */
159 /*@{*/
160 
161 /**
162  * Error output.
163  *
164  * \param fmt printf() like format string.
165  * \param arg arguments
166  */
167 #define DRM_ERROR(fmt, ...)                             \
168         drm_err(fmt, ##__VA_ARGS__)
169 
170 /**
171  * Rate limited error output.  Like DRM_ERROR() but won't flood the log.
172  *
173  * \param fmt printf() like format string.
174  * \param arg arguments
175  */
176 #define DRM_ERROR_RATELIMITED(fmt, ...)                         \
177 ({                                                                      \
178         static DEFINE_RATELIMIT_STATE(_rs,                              \
179                                       DEFAULT_RATELIMIT_INTERVAL,       \
180                                       DEFAULT_RATELIMIT_BURST);         \
181                                                                         \
182         if (__ratelimit(&_rs))                                          \
183                 drm_err(fmt, ##__VA_ARGS__);                            \
184 })
185 
186 #define DRM_INFO(fmt, ...)                              \
187         printk(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
188 
189 #define DRM_INFO_ONCE(fmt, ...)                         \
190         printk_once(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)
191 
192 /**
193  * Debug output.
194  *
195  * \param fmt printf() like format string.
196  * \param arg arguments
197  */
198 #define DRM_DEBUG(fmt, args...)                                         \
199         do {                                                            \
200                 if (unlikely(drm_debug & DRM_UT_CORE))                  \
201                         drm_ut_debug_printk(__func__, fmt, ##args);     \
202         } while (0)
203 
204 #define DRM_DEBUG_DRIVER(fmt, args...)                                  \
205         do {                                                            \
206                 if (unlikely(drm_debug & DRM_UT_DRIVER))                \
207                         drm_ut_debug_printk(__func__, fmt, ##args);     \
208         } while (0)
209 #define DRM_DEBUG_KMS(fmt, args...)                                     \
210         do {                                                            \
211                 if (unlikely(drm_debug & DRM_UT_KMS))                   \
212                         drm_ut_debug_printk(__func__, fmt, ##args);     \
213         } while (0)
214 #define DRM_DEBUG_PRIME(fmt, args...)                                   \
215         do {                                                            \
216                 if (unlikely(drm_debug & DRM_UT_PRIME))                 \
217                         drm_ut_debug_printk(__func__, fmt, ##args);     \
218         } while (0)
219 #define DRM_DEBUG_ATOMIC(fmt, args...)                                  \
220         do {                                                            \
221                 if (unlikely(drm_debug & DRM_UT_ATOMIC))                \
222                         drm_ut_debug_printk(__func__, fmt, ##args);     \
223         } while (0)
224 #define DRM_DEBUG_VBL(fmt, args...)                                     \
225         do {                                                            \
226                 if (unlikely(drm_debug & DRM_UT_VBL))                   \
227                         drm_ut_debug_printk(__func__, fmt, ##args);     \
228         } while (0)
229 
230 /*@}*/
231 
232 /***********************************************************************/
233 /** \name Internal types and structures */
234 /*@{*/
235 
236 #define DRM_IF_VERSION(maj, min) (maj << 16 | min)
237 
238 /**
239  * Ioctl function type.
240  *
241  * \param inode device inode.
242  * \param file_priv DRM file private pointer.
243  * \param cmd command.
244  * \param arg argument.
245  */
246 typedef int drm_ioctl_t(struct drm_device *dev, void *data,
247                         struct drm_file *file_priv);
248 
249 typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
250                                unsigned long arg);
251 
252 #define DRM_IOCTL_NR(n)                _IOC_NR(n)
253 #define DRM_MAJOR       226
254 
255 #define DRM_AUTH        0x1
256 #define DRM_MASTER      0x2
257 #define DRM_ROOT_ONLY   0x4
258 #define DRM_CONTROL_ALLOW 0x8
259 #define DRM_UNLOCKED    0x10
260 #define DRM_RENDER_ALLOW 0x20
261 
262 struct drm_ioctl_desc {
263         unsigned int cmd;
264         int flags;
265         drm_ioctl_t *func;
266         const char *name;
267 };
268 
269 /**
270  * Creates a driver or general drm_ioctl_desc array entry for the given
271  * ioctl, for use by drm_ioctl().
272  */
273 
274 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)                         \
275         [DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = {        \
276                 .cmd = DRM_IOCTL_##ioctl,                               \
277                 .func = _func,                                          \
278                 .flags = _flags,                                        \
279                 .name = #ioctl                                          \
280          }
281 
282 /* Event queued up for userspace to read */
283 struct drm_pending_event {
284         struct drm_event *event;
285         struct list_head link;
286         struct list_head pending_link;
287         struct drm_file *file_priv;
288         pid_t pid; /* pid of requester, no guarantee it's valid by the time
289                       we deliver the event, for tracing only */
290         void (*destroy)(struct drm_pending_event *event);
291 };
292 
293 /* initial implementaton using a linked list - todo hashtab */
294 struct drm_prime_file_private {
295         struct list_head head;
296         struct mutex lock;
297 };
298 
299 /** File private data */
300 struct drm_file {
301         unsigned authenticated :1;
302         /* Whether we're master for a minor. Protected by master_mutex */
303         unsigned is_master :1;
304         /* true when the client has asked us to expose stereo 3D mode flags */
305         unsigned stereo_allowed :1;
306         /*
307          * true if client understands CRTC primary planes and cursor planes
308          * in the plane list
309          */
310         unsigned universal_planes:1;
311         /* true if client understands atomic properties */
312         unsigned atomic:1;
313         /*
314          * This client is allowed to gain master privileges for @master.
315          * Protected by struct drm_device::master_mutex.
316          */
317         unsigned allowed_master:1;
318 
319         struct pid *pid;
320         kuid_t uid;
321         drm_magic_t magic;
322         struct list_head lhead;
323         struct drm_minor *minor;
324         unsigned long lock_count;
325 
326         /** Mapping of mm object handles to object pointers. */
327         struct idr object_idr;
328         /** Lock for synchronization of access to object_idr. */
329         spinlock_t table_lock;
330 
331         struct file *filp;
332         void *driver_priv;
333 
334         struct drm_master *master; /* master this node is currently associated with
335                                       N.B. not always minor->master */
336         /**
337          * fbs - List of framebuffers associated with this file.
338          *
339          * Protected by fbs_lock. Note that the fbs list holds a reference on
340          * the fb object to prevent it from untimely disappearing.
341          */
342         struct list_head fbs;
343         struct mutex fbs_lock;
344 
345         /** User-created blob properties; this retains a reference on the
346          *  property. */
347         struct list_head blobs;
348 
349         wait_queue_head_t event_wait;
350         struct list_head pending_event_list;
351         struct list_head event_list;
352         int event_space;
353 
354         struct mutex event_read_lock;
355 
356         struct drm_prime_file_private prime;
357 };
358 
359 /**
360  * Lock data.
361  */
362 struct drm_lock_data {
363         struct drm_hw_lock *hw_lock;    /**< Hardware lock */
364         /** Private of lock holder's file (NULL=kernel) */
365         struct drm_file *file_priv;
366         wait_queue_head_t lock_queue;   /**< Queue of blocked processes */
367         unsigned long lock_time;        /**< Time of last lock in jiffies */
368         spinlock_t spinlock;
369         uint32_t kernel_waiters;
370         uint32_t user_waiters;
371         int idle_has_lock;
372 };
373 
374 /**
375  * struct drm_master - drm master structure
376  *
377  * @refcount: Refcount for this master object.
378  * @minor: Link back to minor char device we are master for. Immutable.
379  * @unique: Unique identifier: e.g. busid. Protected by drm_global_mutex.
380  * @unique_len: Length of unique field. Protected by drm_global_mutex.
381  * @magic_map: Map of used authentication tokens. Protected by struct_mutex.
382  * @lock: DRI lock information.
383  * @driver_priv: Pointer to driver-private information.
384  */
385 struct drm_master {
386         struct kref refcount;
387         struct drm_minor *minor;
388         char *unique;
389         int unique_len;
390         struct idr magic_map;
391         struct drm_lock_data lock;
392         void *driver_priv;
393 };
394 
395 /* Size of ringbuffer for vblank timestamps. Just double-buffer
396  * in initial implementation.
397  */
398 #define DRM_VBLANKTIME_RBSIZE 2
399 
400 /* Flags and return codes for get_vblank_timestamp() driver function. */
401 #define DRM_CALLED_FROM_VBLIRQ 1
402 #define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
403 #define DRM_VBLANKTIME_IN_VBLANK         (1 << 1)
404 
405 /* get_scanout_position() return flags */
406 #define DRM_SCANOUTPOS_VALID        (1 << 0)
407 #define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
408 #define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
409 
410 /**
411  * DRM driver structure. This structure represent the common code for
412  * a family of cards. There will one drm_device for each card present
413  * in this family
414  */
415 struct drm_driver {
416         int (*load) (struct drm_device *, unsigned long flags);
417         int (*firstopen) (struct drm_device *);
418         int (*open) (struct drm_device *, struct drm_file *);
419         void (*preclose) (struct drm_device *, struct drm_file *file_priv);
420         void (*postclose) (struct drm_device *, struct drm_file *);
421         void (*lastclose) (struct drm_device *);
422         int (*unload) (struct drm_device *);
423         int (*suspend) (struct drm_device *, pm_message_t state);
424         int (*resume) (struct drm_device *);
425         int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
426         int (*dma_quiescent) (struct drm_device *);
427         int (*context_dtor) (struct drm_device *dev, int context);
428         int (*set_busid)(struct drm_device *dev, struct drm_master *master);
429 
430         /**
431          * get_vblank_counter - get raw hardware vblank counter
432          * @dev: DRM device
433          * @pipe: counter to fetch
434          *
435          * Driver callback for fetching a raw hardware vblank counter for @crtc.
436          * If a device doesn't have a hardware counter, the driver can simply
437          * return the value of drm_vblank_count. The DRM core will account for
438          * missed vblank events while interrupts where disabled based on system
439          * timestamps.
440          *
441          * Wraparound handling and loss of events due to modesetting is dealt
442          * with in the DRM core code.
443          *
444          * RETURNS
445          * Raw vblank counter value.
446          */
447         u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
448 
449         /**
450          * enable_vblank - enable vblank interrupt events
451          * @dev: DRM device
452          * @pipe: which irq to enable
453          *
454          * Enable vblank interrupts for @crtc.  If the device doesn't have
455          * a hardware vblank counter, this routine should be a no-op, since
456          * interrupts will have to stay on to keep the count accurate.
457          *
458          * RETURNS
459          * Zero on success, appropriate errno if the given @crtc's vblank
460          * interrupt cannot be enabled.
461          */
462         int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
463 
464         /**
465          * disable_vblank - disable vblank interrupt events
466          * @dev: DRM device
467          * @pipe: which irq to enable
468          *
469          * Disable vblank interrupts for @crtc.  If the device doesn't have
470          * a hardware vblank counter, this routine should be a no-op, since
471          * interrupts will have to stay on to keep the count accurate.
472          */
473         void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
474 
475         /**
476          * Called by \c drm_device_is_agp.  Typically used to determine if a
477          * card is really attached to AGP or not.
478          *
479          * \param dev  DRM device handle
480          *
481          * \returns
482          * One of three values is returned depending on whether or not the
483          * card is absolutely \b not AGP (return of 0), absolutely \b is AGP
484          * (return of 1), or may or may not be AGP (return of 2).
485          */
486         int (*device_is_agp) (struct drm_device *dev);
487 
488         /**
489          * Called by vblank timestamping code.
490          *
491          * Return the current display scanout position from a crtc, and an
492          * optional accurate ktime_get timestamp of when position was measured.
493          *
494          * \param dev  DRM device.
495          * \param pipe Id of the crtc to query.
496          * \param flags Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
497          * \param *vpos Target location for current vertical scanout position.
498          * \param *hpos Target location for current horizontal scanout position.
499          * \param *stime Target location for timestamp taken immediately before
500          *               scanout position query. Can be NULL to skip timestamp.
501          * \param *etime Target location for timestamp taken immediately after
502          *               scanout position query. Can be NULL to skip timestamp.
503          * \param mode Current display timings.
504          *
505          * Returns vpos as a positive number while in active scanout area.
506          * Returns vpos as a negative number inside vblank, counting the number
507          * of scanlines to go until end of vblank, e.g., -1 means "one scanline
508          * until start of active scanout / end of vblank."
509          *
510          * \return Flags, or'ed together as follows:
511          *
512          * DRM_SCANOUTPOS_VALID = Query successful.
513          * DRM_SCANOUTPOS_INVBL = Inside vblank.
514          * DRM_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of
515          * this flag means that returned position may be offset by a constant
516          * but unknown small number of scanlines wrt. real scanout position.
517          *
518          */
519         int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
520                                      unsigned int flags, int *vpos, int *hpos,
521                                      ktime_t *stime, ktime_t *etime,
522                                      const struct drm_display_mode *mode);
523 
524         /**
525          * Called by \c drm_get_last_vbltimestamp. Should return a precise
526          * timestamp when the most recent VBLANK interval ended or will end.
527          *
528          * Specifically, the timestamp in @vblank_time should correspond as
529          * closely as possible to the time when the first video scanline of
530          * the video frame after the end of VBLANK will start scanning out,
531          * the time immediately after end of the VBLANK interval. If the
532          * @crtc is currently inside VBLANK, this will be a time in the future.
533          * If the @crtc is currently scanning out a frame, this will be the
534          * past start time of the current scanout. This is meant to adhere
535          * to the OpenML OML_sync_control extension specification.
536          *
537          * \param dev dev DRM device handle.
538          * \param pipe crtc for which timestamp should be returned.
539          * \param *max_error Maximum allowable timestamp error in nanoseconds.
540          *                   Implementation should strive to provide timestamp
541          *                   with an error of at most *max_error nanoseconds.
542          *                   Returns true upper bound on error for timestamp.
543          * \param *vblank_time Target location for returned vblank timestamp.
544          * \param flags 0 = Defaults, no special treatment needed.
545          * \param       DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
546          *              irq handler. Some drivers need to apply some workarounds
547          *              for gpu-specific vblank irq quirks if flag is set.
548          *
549          * \returns
550          * Zero if timestamping isn't supported in current display mode or a
551          * negative number on failure. A positive status code on success,
552          * which describes how the vblank_time timestamp was computed.
553          */
554         int (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
555                                      int *max_error,
556                                      struct timeval *vblank_time,
557                                      unsigned flags);
558 
559         /* these have to be filled in */
560 
561         irqreturn_t(*irq_handler) (int irq, void *arg);
562         void (*irq_preinstall) (struct drm_device *dev);
563         int (*irq_postinstall) (struct drm_device *dev);
564         void (*irq_uninstall) (struct drm_device *dev);
565 
566         /* Master routines */
567         int (*master_create)(struct drm_device *dev, struct drm_master *master);
568         void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
569         /**
570          * master_set is called whenever the minor master is set.
571          * master_drop is called whenever the minor master is dropped.
572          */
573 
574         int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
575                           bool from_open);
576         void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv,
577                             bool from_release);
578 
579         int (*debugfs_init)(struct drm_minor *minor);
580         void (*debugfs_cleanup)(struct drm_minor *minor);
581 
582         /**
583          * Driver-specific constructor for drm_gem_objects, to set up
584          * obj->driver_private.
585          *
586          * Returns 0 on success.
587          */
588         void (*gem_free_object) (struct drm_gem_object *obj);
589         int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
590         void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
591 
592         /**
593          * Hook for allocating the GEM object struct, for use by core
594          * helpers.
595          */
596         struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
597                                                     size_t size);
598 
599         /* prime: */
600         /* export handle -> fd (see drm_gem_prime_handle_to_fd() helper) */
601         int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
602                                 uint32_t handle, uint32_t flags, int *prime_fd);
603         /* import fd -> handle (see drm_gem_prime_fd_to_handle() helper) */
604         int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
605                                 int prime_fd, uint32_t *handle);
606         /* export GEM -> dmabuf */
607         struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
608                                 struct drm_gem_object *obj, int flags);
609         /* import dmabuf -> GEM */
610         struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
611                                 struct dma_buf *dma_buf);
612         /* low-level interface used by drm_gem_prime_{import,export} */
613         int (*gem_prime_pin)(struct drm_gem_object *obj);
614         void (*gem_prime_unpin)(struct drm_gem_object *obj);
615         struct reservation_object * (*gem_prime_res_obj)(
616                                 struct drm_gem_object *obj);
617         struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
618         struct drm_gem_object *(*gem_prime_import_sg_table)(
619                                 struct drm_device *dev,
620                                 struct dma_buf_attachment *attach,
621                                 struct sg_table *sgt);
622         void *(*gem_prime_vmap)(struct drm_gem_object *obj);
623         void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
624         int (*gem_prime_mmap)(struct drm_gem_object *obj,
625                                 struct vm_area_struct *vma);
626 
627         /* vga arb irq handler */
628         void (*vgaarb_irq)(struct drm_device *dev, bool state);
629 
630         /* dumb alloc support */
631         int (*dumb_create)(struct drm_file *file_priv,
632                            struct drm_device *dev,
633                            struct drm_mode_create_dumb *args);
634         int (*dumb_map_offset)(struct drm_file *file_priv,
635                                struct drm_device *dev, uint32_t handle,
636                                uint64_t *offset);
637         int (*dumb_destroy)(struct drm_file *file_priv,
638                             struct drm_device *dev,
639                             uint32_t handle);
640 
641         /* Driver private ops for this object */
642         const struct vm_operations_struct *gem_vm_ops;
643 
644         int major;
645         int minor;
646         int patchlevel;
647         char *name;
648         char *desc;
649         char *date;
650 
651         u32 driver_features;
652         int dev_priv_size;
653         const struct drm_ioctl_desc *ioctls;
654         int num_ioctls;
655         const struct file_operations *fops;
656 
657         /* List of devices hanging off this driver with stealth attach. */
658         struct list_head legacy_dev_list;
659 };
660 
661 enum drm_minor_type {
662         DRM_MINOR_LEGACY,
663         DRM_MINOR_CONTROL,
664         DRM_MINOR_RENDER,
665         DRM_MINOR_CNT,
666 };
667 
668 /**
669  * Info file list entry. This structure represents a debugfs or proc file to
670  * be created by the drm core
671  */
672 struct drm_info_list {
673         const char *name; /** file name */
674         int (*show)(struct seq_file*, void*); /** show callback */
675         u32 driver_features; /**< Required driver features for this entry */
676         void *data;
677 };
678 
679 /**
680  * debugfs node structure. This structure represents a debugfs file.
681  */
682 struct drm_info_node {
683         struct list_head list;
684         struct drm_minor *minor;
685         const struct drm_info_list *info_ent;
686         struct dentry *dent;
687 };
688 
689 /**
690  * DRM minor structure. This structure represents a drm minor number.
691  */
692 struct drm_minor {
693         int index;                      /**< Minor device number */
694         int type;                       /**< Control or render */
695         struct device *kdev;            /**< Linux device */
696         struct drm_device *dev;
697 
698         struct dentry *debugfs_root;
699 
700         struct list_head debugfs_list;
701         struct mutex debugfs_lock; /* Protects debugfs_list. */
702 
703         /* currently active master for this node. Protected by master_mutex */
704         struct drm_master *master;
705 };
706 
707 
708 struct drm_pending_vblank_event {
709         struct drm_pending_event base;
710         unsigned int pipe;
711         struct drm_event_vblank event;
712 };
713 
714 struct drm_vblank_crtc {
715         struct drm_device *dev;         /* pointer to the drm_device */
716         wait_queue_head_t queue;        /**< VBLANK wait queue */
717         struct timer_list disable_timer;                /* delayed disable timer */
718 
719         /* vblank counter, protected by dev->vblank_time_lock for writes */
720         u32 count;
721         /* vblank timestamps, protected by dev->vblank_time_lock for writes */
722         struct timeval time[DRM_VBLANKTIME_RBSIZE];
723 
724         atomic_t refcount;              /* number of users of vblank interruptsper crtc */
725         u32 last;                       /* protected by dev->vbl_lock, used */
726                                         /* for wraparound handling */
727         u32 last_wait;                  /* Last vblank seqno waited per CRTC */
728         unsigned int inmodeset;         /* Display driver is setting mode */
729         unsigned int pipe;              /* crtc index */
730         int framedur_ns;                /* frame/field duration in ns */
731         int linedur_ns;                 /* line duration in ns */
732         bool enabled;                   /* so we don't call enable more than
733                                            once per disable */
734 };
735 
736 /**
737  * DRM device structure. This structure represent a complete card that
738  * may contain multiple heads.
739  */
740 struct drm_device {
741         struct list_head legacy_dev_list;/**< list of devices per driver for stealth attach cleanup */
742         int if_version;                 /**< Highest interface version set */
743 
744         /** \name Lifetime Management */
745         /*@{ */
746         struct kref ref;                /**< Object ref-count */
747         struct device *dev;             /**< Device structure of bus-device */
748         struct drm_driver *driver;      /**< DRM driver managing the device */
749         void *dev_private;              /**< DRM driver private data */
750         struct drm_minor *control;              /**< Control node */
751         struct drm_minor *primary;              /**< Primary node */
752         struct drm_minor *render;               /**< Render node */
753         atomic_t unplugged;                     /**< Flag whether dev is dead */
754         struct inode *anon_inode;               /**< inode for private address-space */
755         char *unique;                           /**< unique name of the device */
756         /*@} */
757 
758         /** \name Locks */
759         /*@{ */
760         struct mutex struct_mutex;      /**< For others */
761         struct mutex master_mutex;      /**< For drm_minor::master and drm_file::is_master */
762         /*@} */
763 
764         /** \name Usage Counters */
765         /*@{ */
766         int open_count;                 /**< Outstanding files open, protected by drm_global_mutex. */
767         spinlock_t buf_lock;            /**< For drm_device::buf_use and a few other things. */
768         int buf_use;                    /**< Buffers in use -- cannot alloc */
769         atomic_t buf_alloc;             /**< Buffer allocation in progress */
770         /*@} */
771 
772         struct list_head filelist;
773 
774         /** \name Memory management */
775         /*@{ */
776         struct list_head maplist;       /**< Linked list of regions */
777         struct drm_open_hash map_hash;  /**< User token hash table for maps */
778 
779         /** \name Context handle management */
780         /*@{ */
781         struct list_head ctxlist;       /**< Linked list of context handles */
782         struct mutex ctxlist_mutex;     /**< For ctxlist */
783 
784         struct idr ctx_idr;
785 
786         struct list_head vmalist;       /**< List of vmas (for debugging) */
787 
788         /*@} */
789 
790         /** \name DMA support */
791         /*@{ */
792         struct drm_device_dma *dma;             /**< Optional pointer for DMA support */
793         /*@} */
794 
795         /** \name Context support */
796         /*@{ */
797 
798         __volatile__ long context_flag; /**< Context swapping flag */
799         int last_context;               /**< Last current context */
800         /*@} */
801 
802         /** \name VBLANK IRQ support */
803         /*@{ */
804         bool irq_enabled;
805         int irq;
806 
807         /*
808          * At load time, disabling the vblank interrupt won't be allowed since
809          * old clients may not call the modeset ioctl and therefore misbehave.
810          * Once the modeset ioctl *has* been called though, we can safely
811          * disable them when unused.
812          */
813         bool vblank_disable_allowed;
814 
815         /*
816          * If true, vblank interrupt will be disabled immediately when the
817          * refcount drops to zero, as opposed to via the vblank disable
818          * timer.
819          * This can be set to true it the hardware has a working vblank
820          * counter and the driver uses drm_vblank_on() and drm_vblank_off()
821          * appropriately.
822          */
823         bool vblank_disable_immediate;
824 
825         /* array of size num_crtcs */
826         struct drm_vblank_crtc *vblank;
827 
828         spinlock_t vblank_time_lock;    /**< Protects vblank count and time updates during vblank enable/disable */
829         spinlock_t vbl_lock;
830 
831         u32 max_vblank_count;           /**< size of vblank counter register */
832 
833         /**
834          * List of events
835          */
836         struct list_head vblank_event_list;
837         spinlock_t event_lock;
838 
839         /*@} */
840 
841         struct drm_agp_head *agp;       /**< AGP data */
842 
843         struct pci_dev *pdev;           /**< PCI device structure */
844 #ifdef __alpha__
845         struct pci_controller *hose;
846 #endif
847 
848         struct platform_device *platformdev; /**< Platform device struture */
849         struct virtio_device *virtdev;
850 
851         struct drm_sg_mem *sg;  /**< Scatter gather memory */
852         unsigned int num_crtcs;                  /**< Number of CRTCs on this device */
853 
854         struct {
855                 int context;
856                 struct drm_hw_lock *lock;
857         } sigdata;
858 
859         struct drm_local_map *agp_buffer_map;
860         unsigned int agp_buffer_token;
861 
862         struct drm_mode_config mode_config;     /**< Current mode config */
863 
864         /** \name GEM information */
865         /*@{ */
866         struct mutex object_name_lock;
867         struct idr object_name_idr;
868         struct drm_vma_offset_manager *vma_offset_manager;
869         /*@} */
870         int switch_power_state;
871 };
872 
873 #define DRM_SWITCH_POWER_ON 0
874 #define DRM_SWITCH_POWER_OFF 1
875 #define DRM_SWITCH_POWER_CHANGING 2
876 #define DRM_SWITCH_POWER_DYNAMIC_OFF 3
877 
878 static __inline__ int drm_core_check_feature(struct drm_device *dev,
879                                              int feature)
880 {
881         return ((dev->driver->driver_features & feature) ? 1 : 0);
882 }
883 
884 static inline void drm_device_set_unplugged(struct drm_device *dev)
885 {
886         smp_wmb();
887         atomic_set(&dev->unplugged, 1);
888 }
889 
890 static inline int drm_device_is_unplugged(struct drm_device *dev)
891 {
892         int ret = atomic_read(&dev->unplugged);
893         smp_rmb();
894         return ret;
895 }
896 
897 static inline bool drm_is_render_client(const struct drm_file *file_priv)
898 {
899         return file_priv->minor->type == DRM_MINOR_RENDER;
900 }
901 
902 static inline bool drm_is_control_client(const struct drm_file *file_priv)
903 {
904         return file_priv->minor->type == DRM_MINOR_CONTROL;
905 }
906 
907 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
908 {
909         return file_priv->minor->type == DRM_MINOR_LEGACY;
910 }
911 
912 /******************************************************************/
913 /** \name Internal function definitions */
914 /*@{*/
915 
916                                 /* Driver support (drm_drv.h) */
917 extern int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);
918 extern long drm_ioctl(struct file *filp,
919                       unsigned int cmd, unsigned long arg);
920 extern long drm_compat_ioctl(struct file *filp,
921                              unsigned int cmd, unsigned long arg);
922 extern bool drm_ioctl_flags(unsigned int nr, unsigned int *flags);
923 
924 /* File Operations (drm_fops.c) */
925 int drm_open(struct inode *inode, struct file *filp);
926 ssize_t drm_read(struct file *filp, char __user *buffer,
927                  size_t count, loff_t *offset);
928 int drm_release(struct inode *inode, struct file *filp);
929 int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv);
930 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);
931 int drm_event_reserve_init_locked(struct drm_device *dev,
932                                   struct drm_file *file_priv,
933                                   struct drm_pending_event *p,
934                                   struct drm_event *e);
935 int drm_event_reserve_init(struct drm_device *dev,
936                            struct drm_file *file_priv,
937                            struct drm_pending_event *p,
938                            struct drm_event *e);
939 void drm_event_cancel_free(struct drm_device *dev,
940                            struct drm_pending_event *p);
941 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
942 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
943 
944 /* Misc. IOCTL support (drm_ioctl.c) */
945 int drm_noop(struct drm_device *dev, void *data,
946              struct drm_file *file_priv);
947 int drm_invalid_op(struct drm_device *dev, void *data,
948                    struct drm_file *file_priv);
949 
950 /* Cache management (drm_cache.c) */
951 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
952 void drm_clflush_sg(struct sg_table *st);
953 void drm_clflush_virt_range(void *addr, unsigned long length);
954 
955 /*
956  * These are exported to drivers so that they can implement fencing using
957  * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
958  */
959 
960                                 /* IRQ support (drm_irq.h) */
961 extern int drm_irq_install(struct drm_device *dev, int irq);
962 extern int drm_irq_uninstall(struct drm_device *dev);
963 
964 extern int drm_vblank_init(struct drm_device *dev, unsigned int num_crtcs);
965 extern int drm_wait_vblank(struct drm_device *dev, void *data,
966                            struct drm_file *filp);
967 extern u32 drm_vblank_count(struct drm_device *dev, unsigned int pipe);
968 extern u32 drm_crtc_vblank_count(struct drm_crtc *crtc);
969 extern u32 drm_vblank_count_and_time(struct drm_device *dev, unsigned int pipe,
970                                      struct timeval *vblanktime);
971 extern u32 drm_crtc_vblank_count_and_time(struct drm_crtc *crtc,
972                                           struct timeval *vblanktime);
973 extern void drm_send_vblank_event(struct drm_device *dev, unsigned int pipe,
974                                   struct drm_pending_vblank_event *e);
975 extern void drm_crtc_send_vblank_event(struct drm_crtc *crtc,
976                                        struct drm_pending_vblank_event *e);
977 extern void drm_arm_vblank_event(struct drm_device *dev, unsigned int pipe,
978                                  struct drm_pending_vblank_event *e);
979 extern void drm_crtc_arm_vblank_event(struct drm_crtc *crtc,
980                                       struct drm_pending_vblank_event *e);
981 extern bool drm_handle_vblank(struct drm_device *dev, unsigned int pipe);
982 extern bool drm_crtc_handle_vblank(struct drm_crtc *crtc);
983 extern int drm_vblank_get(struct drm_device *dev, unsigned int pipe);
984 extern void drm_vblank_put(struct drm_device *dev, unsigned int pipe);
985 extern int drm_crtc_vblank_get(struct drm_crtc *crtc);
986 extern void drm_crtc_vblank_put(struct drm_crtc *crtc);
987 extern void drm_wait_one_vblank(struct drm_device *dev, unsigned int pipe);
988 extern void drm_crtc_wait_one_vblank(struct drm_crtc *crtc);
989 extern void drm_vblank_off(struct drm_device *dev, unsigned int pipe);
990 extern void drm_vblank_on(struct drm_device *dev, unsigned int pipe);
991 extern void drm_crtc_vblank_off(struct drm_crtc *crtc);
992 extern void drm_crtc_vblank_reset(struct drm_crtc *crtc);
993 extern void drm_crtc_vblank_on(struct drm_crtc *crtc);
994 extern void drm_vblank_cleanup(struct drm_device *dev);
995 extern u32 drm_vblank_no_hw_counter(struct drm_device *dev, unsigned int pipe);
996 
997 extern int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev,
998                                                  unsigned int pipe, int *max_error,
999                                                  struct timeval *vblank_time,
1000                                                  unsigned flags,
1001                                                  const struct drm_display_mode *mode);
1002 extern void drm_calc_timestamping_constants(struct drm_crtc *crtc,
1003                                             const struct drm_display_mode *mode);
1004 
1005 /**
1006  * drm_crtc_vblank_waitqueue - get vblank waitqueue for the CRTC
1007  * @crtc: which CRTC's vblank waitqueue to retrieve
1008  *
1009  * This function returns a pointer to the vblank waitqueue for the CRTC.
1010  * Drivers can use this to implement vblank waits using wait_event() & co.
1011  */
1012 static inline wait_queue_head_t *drm_crtc_vblank_waitqueue(struct drm_crtc *crtc)
1013 {
1014         return &crtc->dev->vblank[drm_crtc_index(crtc)].queue;
1015 }
1016 
1017 /* Modesetting support */
1018 extern void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe);
1019 extern void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe);
1020 
1021                                 /* Stub support (drm_stub.h) */
1022 extern struct drm_master *drm_master_get(struct drm_master *master);
1023 extern void drm_master_put(struct drm_master **master);
1024 
1025 extern void drm_put_dev(struct drm_device *dev);
1026 extern void drm_unplug_dev(struct drm_device *dev);
1027 extern unsigned int drm_debug;
1028 extern bool drm_atomic;
1029 
1030                                 /* Debugfs support */
1031 #if defined(CONFIG_DEBUG_FS)
1032 extern int drm_debugfs_create_files(const struct drm_info_list *files,
1033                                     int count, struct dentry *root,
1034                                     struct drm_minor *minor);
1035 extern int drm_debugfs_remove_files(const struct drm_info_list *files,
1036                                     int count, struct drm_minor *minor);
1037 #else
1038 static inline int drm_debugfs_create_files(const struct drm_info_list *files,
1039                                            int count, struct dentry *root,
1040                                            struct drm_minor *minor)
1041 {
1042         return 0;
1043 }
1044 
1045 static inline int drm_debugfs_remove_files(const struct drm_info_list *files,
1046                                            int count, struct drm_minor *minor)
1047 {
1048         return 0;
1049 }
1050 #endif
1051 
1052 extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
1053                 struct drm_gem_object *obj, int flags);
1054 extern int drm_gem_prime_handle_to_fd(struct drm_device *dev,
1055                 struct drm_file *file_priv, uint32_t handle, uint32_t flags,
1056                 int *prime_fd);
1057 extern struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
1058                 struct dma_buf *dma_buf);
1059 extern int drm_gem_prime_fd_to_handle(struct drm_device *dev,
1060                 struct drm_file *file_priv, int prime_fd, uint32_t *handle);
1061 extern void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
1062 
1063 extern int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
1064                                             dma_addr_t *addrs, int max_pages);
1065 extern struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages);
1066 extern void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg);
1067 
1068 
1069 extern struct drm_dma_handle *drm_pci_alloc(struct drm_device *dev, size_t size,
1070                                             size_t align);
1071 extern void drm_pci_free(struct drm_device *dev, struct drm_dma_handle * dmah);
1072 
1073                                /* sysfs support (drm_sysfs.c) */
1074 extern void drm_sysfs_hotplug_event(struct drm_device *dev);
1075 
1076 
1077 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
1078                                  struct device *parent);
1079 void drm_dev_ref(struct drm_device *dev);
1080 void drm_dev_unref(struct drm_device *dev);
1081 int drm_dev_register(struct drm_device *dev, unsigned long flags);
1082 void drm_dev_unregister(struct drm_device *dev);
1083 int drm_dev_set_unique(struct drm_device *dev, const char *name);
1084 
1085 struct drm_minor *drm_minor_acquire(unsigned int minor_id);
1086 void drm_minor_release(struct drm_minor *minor);
1087 
1088 /*@}*/
1089 
1090 /* PCI section */
1091 static __inline__ int drm_pci_device_is_agp(struct drm_device *dev)
1092 {
1093         if (dev->driver->device_is_agp != NULL) {
1094                 int err = (*dev->driver->device_is_agp) (dev);
1095 
1096                 if (err != 2) {
1097                         return err;
1098                 }
1099         }
1100 
1101         return pci_find_capability(dev->pdev, PCI_CAP_ID_AGP);
1102 }
1103 void drm_pci_agp_destroy(struct drm_device *dev);
1104 
1105 extern int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver);
1106 extern void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver);
1107 #ifdef CONFIG_PCI
1108 extern int drm_get_pci_dev(struct pci_dev *pdev,
1109                            const struct pci_device_id *ent,
1110                            struct drm_driver *driver);
1111 extern int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master);
1112 #else
1113 static inline int drm_get_pci_dev(struct pci_dev *pdev,
1114                                   const struct pci_device_id *ent,
1115                                   struct drm_driver *driver)
1116 {
1117         return -ENOSYS;
1118 }
1119 
1120 static inline int drm_pci_set_busid(struct drm_device *dev,
1121                                     struct drm_master *master)
1122 {
1123         return -ENOSYS;
1124 }
1125 #endif
1126 
1127 #define DRM_PCIE_SPEED_25 1
1128 #define DRM_PCIE_SPEED_50 2
1129 #define DRM_PCIE_SPEED_80 4
1130 
1131 extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);
1132 extern int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw);
1133 
1134 /* platform section */
1135 extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);
1136 extern int drm_platform_set_busid(struct drm_device *d, struct drm_master *m);
1137 
1138 /* returns true if currently okay to sleep */
1139 static __inline__ bool drm_can_sleep(void)
1140 {
1141         if (in_atomic() || in_dbg_master() || irqs_disabled())
1142                 return false;
1143         return true;
1144 }
1145 
1146 /* helper for handling conditionals in various for_each macros */
1147 #define for_each_if(condition) if (!(condition)) {} else
1148 
1149 #endif
1150 

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