include/drm/drmP.h

   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/platform_device.h>
  51 #include <linux/poll.h>
  52 #include <linux/ratelimit.h>
  53 #include <linux/sched.h>
  54 #include <linux/slab.h>
  55 #include <linux/types.h>
  56 #include <linux/vmalloc.h>
  57 #include <linux/workqueue.h>
  58 #include <linux/dma-fence.h>
  59 #include <linux/module.h>
  60
  61 #include <asm/mman.h>
  62 #include <asm/pgalloc.h>
  63 #include <linux/uaccess.h>
  64
  65 #include <uapi/drm/drm.h>
  66 #include <uapi/drm/drm_mode.h>
  67
  68 #include <drm/drm_agpsupport.h>
  69 #include <drm/drm_crtc.h>
  70 #include <drm/drm_fourcc.h>
  71 #include <drm/drm_global.h>
  72 #include <drm/drm_hashtab.h>
  73 #include <drm/drm_mem_util.h>
  74 #include <drm/drm_mm.h>
  75 #include <drm/drm_os_linux.h>
  76 #include <drm/drm_sarea.h>
  77 #include <drm/drm_drv.h>
  78 #include <drm/drm_prime.h>
  79 #include <drm/drm_pci.h>
  80 #include <drm/drm_file.h>
  81
  82 struct module;
  83
  84 struct drm_device;
  85 struct drm_agp_head;
  86 struct drm_local_map;
  87 struct drm_device_dma;
  88 struct drm_gem_object;
  89 struct drm_master;
  90 struct drm_vblank_crtc;
  91 struct drm_vma_offset_manager;
  92
  93 struct device_node;
  94 struct videomode;
  95 struct reservation_object;
  96 struct dma_buf_attachment;
  97
  98 struct pci_dev;
  99 struct pci_controller;
 100
 101 /*
 102  * The following categories are defined:
 103  *
 104  * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
 105  *       This is the category used by the DRM_DEBUG() macro.
 106  *
 107  * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
 108  *         This is the category used by the DRM_DEBUG_DRIVER() macro.
 109  *
 110  * KMS: used in the modesetting code.
 111  *      This is the category used by the DRM_DEBUG_KMS() macro.
 112  *
 113  * PRIME: used in the prime code.
 114  *        This is the category used by the DRM_DEBUG_PRIME() macro.
 115  *
 116  * ATOMIC: used in the atomic code.
 117  *        This is the category used by the DRM_DEBUG_ATOMIC() macro.
 118  *
 119  * VBL: used for verbose debug message in the vblank code
 120  *        This is the category used by the DRM_DEBUG_VBL() macro.
 121  *
 122  * Enabling verbose debug messages is done through the drm.debug parameter,
 123  * each category being enabled by a bit.
 124  *
 125  * drm.debug=0x1 will enable CORE messages
 126  * drm.debug=0x2 will enable DRIVER messages
 127  * drm.debug=0x3 will enable CORE and DRIVER messages
 128  * ...
 129  * drm.debug=0x3f will enable all messages
 130  *
 131  * An interesting feature is that it's possible to enable verbose logging at
 132  * run-time by echoing the debug value in its sysfs node:
 133  *   # echo 0xf > /sys/module/drm/parameters/debug
 134  */
 135 #define DRM_UT_NONE             0x00
 136 #define DRM_UT_CORE             0x01
 137 #define DRM_UT_DRIVER           0x02
 138 #define DRM_UT_KMS              0x04
 139 #define DRM_UT_PRIME            0x08
 140 #define DRM_UT_ATOMIC           0x10
 141 #define DRM_UT_VBL              0x20
 142 #define DRM_UT_STATE            0x40
 143
 144 /***********************************************************************/
 145 /** \name DRM template customization defaults */
 146 /*@{*/
 147
 148 /***********************************************************************/
 149 /** \name Macros to make printk easier */
 150 /*@{*/
 151
 152 #define _DRM_PRINTK(once, level, fmt, ...)                              \
 153         do {                                                            \
 154                 printk##once(KERN_##level "[" DRM_NAME "] " fmt,        \
 155                              ##__VA_ARGS__);                            \
 156         } while (0)
 157
 158 #define DRM_INFO(fmt, ...)                                              \
 159         _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
 160 #define DRM_NOTE(fmt, ...)                                              \
 161         _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
 162 #define DRM_WARN(fmt, ...)                                              \
 163         _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
 164
 165 #define DRM_INFO_ONCE(fmt, ...)                                         \
 166         _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
 167 #define DRM_NOTE_ONCE(fmt, ...)                                         \
 168         _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
 169 #define DRM_WARN_ONCE(fmt, ...)                                         \
 170         _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
 171
 172 /**
 173  * Error output.
 174  *
 175  * \param fmt printf() like format string.
 176  * \param arg arguments
 177  */
 178 #define DRM_DEV_ERROR(dev, fmt, ...)                                    \
 179         drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
 180                        fmt, ##__VA_ARGS__)
 181 #define DRM_ERROR(fmt, ...)                                             \
 182         drm_printk(KERN_ERR, DRM_UT_NONE, fmt,  ##__VA_ARGS__)
 183
 184 /**
 185  * Rate limited error output.  Like DRM_ERROR() but won't flood the log.
 186  *
 187  * \param fmt printf() like format string.
 188  * \param arg arguments
 189  */
 190 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...)                        \
 191 ({                                                                      \
 192         static DEFINE_RATELIMIT_STATE(_rs,                              \
 193                                       DEFAULT_RATELIMIT_INTERVAL,       \
 194                                       DEFAULT_RATELIMIT_BURST);         \
 195                                                                         \
 196         if (__ratelimit(&_rs))                                          \
 197                 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__);                 \
 198 })
 199 #define DRM_ERROR_RATELIMITED(fmt, ...)                                 \
 200         DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
 201
 202 #define DRM_DEV_INFO(dev, fmt, ...)                                     \
 203         drm_dev_printk(dev, KERN_INFO, DRM_UT_NONE, __func__, "", fmt,  \
 204                        ##__VA_ARGS__)
 205
 206 #define DRM_DEV_INFO_ONCE(dev, fmt, ...)                                \
 207 ({                                                                      \
 208         static bool __print_once __read_mostly;                         \
 209         if (!__print_once) {                                            \
 210                 __print_once = true;                                    \
 211                 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__);                  \
 212         }                                                               \
 213 })
 214
 215 /**
 216  * Debug output.
 217  *
 218  * \param fmt printf() like format string.
 219  * \param arg arguments
 220  */
 221 #define DRM_DEV_DEBUG(dev, fmt, args...)                                \
 222         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt, \
 223                        ##args)
 224 #define DRM_DEBUG(fmt, ...)                                             \
 225         drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
 226
 227 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...)                         \
 228         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "",    \
 229                        fmt, ##args)
 230 #define DRM_DEBUG_DRIVER(fmt, ...)                                      \
 231         drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
 232
 233 #define DRM_DEV_DEBUG_KMS(dev, fmt, args...)                            \
 234         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt,  \
 235                        ##args)
 236 #define DRM_DEBUG_KMS(fmt, ...)                                 \
 237         drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
 238
 239 #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...)                          \
 240         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "",     \
 241                        fmt, ##args)
 242 #define DRM_DEBUG_PRIME(fmt, ...)                                       \
 243         drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
 244
 245 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...)                         \
 246         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "",    \
 247                        fmt, ##args)
 248 #define DRM_DEBUG_ATOMIC(fmt, ...)                                      \
 249         drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
 250
 251 #define DRM_DEV_DEBUG_VBL(dev, fmt, args...)                            \
 252         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt,  \
 253                        ##args)
 254 #define DRM_DEBUG_VBL(fmt, ...)                                 \
 255         drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
 256
 257 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...)     \
 258 ({                                                                      \
 259         static DEFINE_RATELIMIT_STATE(_rs,                              \
 260                                       DEFAULT_RATELIMIT_INTERVAL,       \
 261                                       DEFAULT_RATELIMIT_BURST);         \
 262         if (__ratelimit(&_rs))                                          \
 263                 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ ## level,       \
 264                                __func__, "", fmt, ##args);              \
 265 })
 266
 267 /**
 268  * Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
 269  *
 270  * \param fmt printf() like format string.
 271  * \param arg arguments
 272  */
 273 #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, args...)                    \
 274         DEV__DRM_DEFINE_DEBUG_RATELIMITED(dev, CORE, fmt, ##args)
 275 #define DRM_DEBUG_RATELIMITED(fmt, args...)                             \
 276         DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##args)
 277 #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, args...)             \
 278         _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRIVER, fmt, ##args)
 279 #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, args...)                      \
 280         DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##args)
 281 #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, args...)                \
 282         _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, KMS, fmt, ##args)
 283 #define DRM_DEBUG_KMS_RATELIMITED(fmt, args...)                         \
 284         DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##args)
 285 #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, args...)              \
 286         _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, PRIME, fmt, ##args)
 287 #define DRM_DEBUG_PRIME_RATELIMITED(fmt, args...)                       \
 288         DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##args)
 289
 290 /* Format strings and argument splitters to simplify printing
 291  * various "complex" objects
 292  */
 293 #define DRM_MODE_FMT    "%d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x"
 294 #define DRM_MODE_ARG(m) \
 295         (m)->base.id, (m)->name, (m)->vrefresh, (m)->clock, \
 296         (m)->hdisplay, (m)->hsync_start, (m)->hsync_end, (m)->htotal, \
 297         (m)->vdisplay, (m)->vsync_start, (m)->vsync_end, (m)->vtotal, \
 298         (m)->type, (m)->flags
 299
 300 #define DRM_RECT_FMT    "%dx%d%+d%+d"
 301 #define DRM_RECT_ARG(r) drm_rect_width(r), drm_rect_height(r), (r)->x1, (r)->y1
 302
 303 /* for rect's in fixed-point format: */
 304 #define DRM_RECT_FP_FMT "%d.%06ux%d.%06u%+d.%06u%+d.%06u"
 305 #define DRM_RECT_FP_ARG(r) \
 306                 drm_rect_width(r) >> 16, ((drm_rect_width(r) & 0xffff) * 15625) >> 10, \
 307                 drm_rect_height(r) >> 16, ((drm_rect_height(r) & 0xffff) * 15625) >> 10, \
 308                 (r)->x1 >> 16, (((r)->x1 & 0xffff) * 15625) >> 10, \
 309                 (r)->y1 >> 16, (((r)->y1 & 0xffff) * 15625) >> 10
 310
 311 /*@}*/
 312
 313 /***********************************************************************/
 314 /** \name Internal types and structures */
 315 /*@{*/
 316
 317 #define DRM_IF_VERSION(maj, min) (maj << 16 | min)
 318
 319 /**
 320  * Ioctl function type.
 321  *
 322  * \param inode device inode.
 323  * \param file_priv DRM file private pointer.
 324  * \param cmd command.
 325  * \param arg argument.
 326  */
 327 typedef int drm_ioctl_t(struct drm_device *dev, void *data,
 328                         struct drm_file *file_priv);
 329
 330 typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
 331                                unsigned long arg);
 332
 333 #define DRM_IOCTL_NR(n)                _IOC_NR(n)
 334 #define DRM_MAJOR       226
 335
 336 #define DRM_AUTH        0x1
 337 #define DRM_MASTER      0x2
 338 #define DRM_ROOT_ONLY   0x4
 339 #define DRM_CONTROL_ALLOW 0x8
 340 #define DRM_UNLOCKED    0x10
 341 #define DRM_RENDER_ALLOW 0x20
 342
 343 struct drm_ioctl_desc {
 344         unsigned int cmd;
 345         int flags;
 346         drm_ioctl_t *func;
 347         const char *name;
 348 };
 349
 350 /**
 351  * Creates a driver or general drm_ioctl_desc array entry for the given
 352  * ioctl, for use by drm_ioctl().
 353  */
 354
 355 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)                         \
 356         [DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = {        \
 357                 .cmd = DRM_IOCTL_##ioctl,                               \
 358                 .func = _func,                                          \
 359                 .flags = _flags,                                        \
 360                 .name = #ioctl                                          \
 361          }
 362
 363 /* Flags and return codes for get_vblank_timestamp() driver function. */
 364 #define DRM_CALLED_FROM_VBLIRQ 1
 365 #define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
 366 #define DRM_VBLANKTIME_IN_VBLANK         (1 << 1)
 367
 368 /* get_scanout_position() return flags */
 369 #define DRM_SCANOUTPOS_VALID        (1 << 0)
 370 #define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
 371 #define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
 372
 373 /**
 374  * Info file list entry. This structure represents a debugfs or proc file to
 375  * be created by the drm core
 376  */
 377 struct drm_info_list {
 378         const char *name; /** file name */
 379         int (*show)(struct seq_file*, void*); /** show callback */
 380         u32 driver_features; /**< Required driver features for this entry */
 381         void *data;
 382 };
 383
 384 /**
 385  * debugfs node structure. This structure represents a debugfs file.
 386  */
 387 struct drm_info_node {
 388         struct list_head list;
 389         struct drm_minor *minor;
 390         const struct drm_info_list *info_ent;
 391         struct dentry *dent;
 392 };
 393
 394 /**
 395  * DRM device structure. This structure represent a complete card that
 396  * may contain multiple heads.
 397  */
 398 struct drm_device {
 399         struct list_head legacy_dev_list;/**< list of devices per driver for stealth attach cleanup */
 400         int if_version;                 /**< Highest interface version set */
 401
 402         /** \name Lifetime Management */
 403         /*@{ */
 404         struct kref ref;                /**< Object ref-count */
 405         struct device *dev;             /**< Device structure of bus-device */
 406         struct drm_driver *driver;      /**< DRM driver managing the device */
 407         void *dev_private;              /**< DRM driver private data */
 408         struct drm_minor *control;              /**< Control node */
 409         struct drm_minor *primary;              /**< Primary node */
 410         struct drm_minor *render;               /**< Render node */
 411         bool registered;
 412
 413         /* currently active master for this device. Protected by master_mutex */
 414         struct drm_master *master;
 415
 416         atomic_t unplugged;                     /**< Flag whether dev is dead */
 417         struct inode *anon_inode;               /**< inode for private address-space */
 418         char *unique;                           /**< unique name of the device */
 419         /*@} */
 420
 421         /** \name Locks */
 422         /*@{ */
 423         struct mutex struct_mutex;      /**< For others */
 424         struct mutex master_mutex;      /**< For drm_minor::master and drm_file::is_master */
 425         /*@} */
 426
 427         /** \name Usage Counters */
 428         /*@{ */
 429         int open_count;                 /**< Outstanding files open, protected by drm_global_mutex. */
 430         spinlock_t buf_lock;            /**< For drm_device::buf_use and a few other things. */
 431         int buf_use;                    /**< Buffers in use -- cannot alloc */
 432         atomic_t buf_alloc;             /**< Buffer allocation in progress */
 433         /*@} */
 434
 435         struct mutex filelist_mutex;
 436         struct list_head filelist;
 437
 438         /** \name Memory management */
 439         /*@{ */
 440         struct list_head maplist;       /**< Linked list of regions */
 441         struct drm_open_hash map_hash;  /**< User token hash table for maps */
 442
 443         /** \name Context handle management */
 444         /*@{ */
 445         struct list_head ctxlist;       /**< Linked list of context handles */
 446         struct mutex ctxlist_mutex;     /**< For ctxlist */
 447
 448         struct idr ctx_idr;
 449
 450         struct list_head vmalist;       /**< List of vmas (for debugging) */
 451
 452         /*@} */
 453
 454         /** \name DMA support */
 455         /*@{ */
 456         struct drm_device_dma *dma;             /**< Optional pointer for DMA support */
 457         /*@} */
 458
 459         /** \name Context support */
 460         /*@{ */
 461
 462         __volatile__ long context_flag; /**< Context swapping flag */
 463         int last_context;               /**< Last current context */
 464         /*@} */
 465
 466         /** \name VBLANK IRQ support */
 467         /*@{ */
 468         bool irq_enabled;
 469         int irq;
 470
 471         /*
 472          * If true, vblank interrupt will be disabled immediately when the
 473          * refcount drops to zero, as opposed to via the vblank disable
 474          * timer.
 475          * This can be set to true it the hardware has a working vblank
 476          * counter and the driver uses drm_vblank_on() and drm_vblank_off()
 477          * appropriately.
 478          */
 479         bool vblank_disable_immediate;
 480
 481         /* array of size num_crtcs */
 482         struct drm_vblank_crtc *vblank;
 483
 484         spinlock_t vblank_time_lock;    /**< Protects vblank count and time updates during vblank enable/disable */
 485         spinlock_t vbl_lock;
 486
 487         u32 max_vblank_count;           /**< size of vblank counter register */
 488
 489         /**
 490          * List of events
 491          */
 492         struct list_head vblank_event_list;
 493         spinlock_t event_lock;
 494
 495         /*@} */
 496
 497         struct drm_agp_head *agp;       /**< AGP data */
 498
 499         struct pci_dev *pdev;           /**< PCI device structure */
 500 #ifdef __alpha__
 501         struct pci_controller *hose;
 502 #endif
 503
 504         struct platform_device *platformdev; /**< Platform device struture */
 505         struct virtio_device *virtdev;
 506
 507         struct drm_sg_mem *sg;  /**< Scatter gather memory */
 508         unsigned int num_crtcs;                  /**< Number of CRTCs on this device */
 509
 510         struct {
 511                 int context;
 512                 struct drm_hw_lock *lock;
 513         } sigdata;
 514
 515         struct drm_local_map *agp_buffer_map;
 516         unsigned int agp_buffer_token;
 517
 518         struct drm_mode_config mode_config;     /**< Current mode config */
 519
 520         /** \name GEM information */
 521         /*@{ */
 522         struct mutex object_name_lock;
 523         struct idr object_name_idr;
 524         struct drm_vma_offset_manager *vma_offset_manager;
 525         /*@} */
 526         int switch_power_state;
 527 };
 528
 529 /**
 530  * drm_drv_uses_atomic_modeset - check if the driver implements
 531  * atomic_commit()
 532  * @dev: DRM device
 533  *
 534  * This check is useful if drivers do not have DRIVER_ATOMIC set but
 535  * have atomic modesetting internally implemented.
 536  */
 537 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
 538 {
 539         return dev->mode_config.funcs->atomic_commit != NULL;
 540 }
 541
 542 #include <drm/drm_irq.h>
 543
 544 #define DRM_SWITCH_POWER_ON 0
 545 #define DRM_SWITCH_POWER_OFF 1
 546 #define DRM_SWITCH_POWER_CHANGING 2
 547 #define DRM_SWITCH_POWER_DYNAMIC_OFF 3
 548
 549 static __inline__ int drm_core_check_feature(struct drm_device *dev,
 550                                              int feature)
 551 {
 552         return ((dev->driver->driver_features & feature) ? 1 : 0);
 553 }
 554
 555 static inline void drm_device_set_unplugged(struct drm_device *dev)
 556 {
 557         smp_wmb();
 558         atomic_set(&dev->unplugged, 1);
 559 }
 560
 561 static inline int drm_device_is_unplugged(struct drm_device *dev)
 562 {
 563         int ret = atomic_read(&dev->unplugged);
 564         smp_rmb();
 565         return ret;
 566 }
 567
 568 /******************************************************************/
 569 /** \name Internal function definitions */
 570 /*@{*/
 571
 572                                 /* Driver support (drm_drv.h) */
 573 extern int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);
 574 extern long drm_ioctl(struct file *filp,
 575                       unsigned int cmd, unsigned long arg);
 576 #ifdef CONFIG_COMPAT
 577 extern long drm_compat_ioctl(struct file *filp,
 578                              unsigned int cmd, unsigned long arg);
 579 #else
 580 /* Let drm_compat_ioctl be assigned to .compat_ioctl unconditionally */
 581 #define drm_compat_ioctl NULL
 582 #endif
 583 extern bool drm_ioctl_flags(unsigned int nr, unsigned int *flags);
 584
 585 /* Misc. IOCTL support (drm_ioctl.c) */
 586 int drm_noop(struct drm_device *dev, void *data,
 587              struct drm_file *file_priv);
 588 int drm_invalid_op(struct drm_device *dev, void *data,
 589                    struct drm_file *file_priv);
 590
 591 /*
 592  * These are exported to drivers so that they can implement fencing using
 593  * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
 594  */
 595
 596                                 /* Debugfs support */
 597 #if defined(CONFIG_DEBUG_FS)
 598 extern int drm_debugfs_create_files(const struct drm_info_list *files,
 599                                     int count, struct dentry *root,
 600                                     struct drm_minor *minor);
 601 extern int drm_debugfs_remove_files(const struct drm_info_list *files,
 602                                     int count, struct drm_minor *minor);
 603 #else
 604 static inline int drm_debugfs_create_files(const struct drm_info_list *files,
 605                                            int count, struct dentry *root,
 606                                            struct drm_minor *minor)
 607 {
 608         return 0;
 609 }
 610
 611 static inline int drm_debugfs_remove_files(const struct drm_info_list *files,
 612                                            int count, struct drm_minor *minor)
 613 {
 614         return 0;
 615 }
 616 #endif
 617
 618                                /* sysfs support (drm_sysfs.c) */
 619 extern void drm_sysfs_hotplug_event(struct drm_device *dev);
 620
 621
 622 /*@}*/
 623
 624 /* returns true if currently okay to sleep */
 625 static __inline__ bool drm_can_sleep(void)
 626 {
 627         if (in_atomic() || in_dbg_master() || irqs_disabled())
 628                 return false;
 629         return true;
 630 }
 631
 632 /* helper for handling conditionals in various for_each macros */
 633 #define for_each_if(condition) if (!(condition)) {} else
 634
 635 #endif