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/pci.h>
  51 #include <linux/platform_device.h>
  52 #include <linux/poll.h>
  53 #include <linux/ratelimit.h>
  54 #include <linux/rbtree.h>
  55 #include <linux/sched.h>
  56 #include <linux/slab.h>
  57 #include <linux/types.h>
  58 #include <linux/vmalloc.h>
  59 #include <linux/workqueue.h>
  60 #include <linux/fence.h>
  61
  62 #include <asm/mman.h>
  63 #include <asm/pgalloc.h>
  64 #include <asm/uaccess.h>
  65
  66 #include <uapi/drm/drm.h>
  67 #include <uapi/drm/drm_mode.h>
  68
  69 #include <drm/drm_agpsupport.h>
  70 #include <drm/drm_crtc.h>
  71 #include <drm/drm_fourcc.h>
  72 #include <drm/drm_global.h>
  73 #include <drm/drm_hashtab.h>
  74 #include <drm/drm_mem_util.h>
  75 #include <drm/drm_mm.h>
  76 #include <drm/drm_os_linux.h>
  77 #include <drm/drm_sarea.h>
  78 #include <drm/drm_vma_manager.h>
  79
  80 struct module;
  81
  82 struct drm_file;
  83 struct drm_device;
  84 struct drm_agp_head;
  85 struct drm_local_map;
  86 struct drm_device_dma;
  87 struct drm_dma_handle;
  88 struct drm_gem_object;
  89 struct drm_master;
  90 struct drm_vblank_crtc;
  91
  92 struct device_node;
  93 struct videomode;
  94 struct reservation_object;
  95 struct dma_buf_attachment;
  96
  97 /*
  98  * The following categories are defined:
  99  *
 100  * CORE: Used in the generic drm code: drm_ioctl.c, drm_mm.c, drm_memory.c, ...
 101  *       This is the category used by the DRM_DEBUG() macro.
 102  *
 103  * DRIVER: Used in the vendor specific part of the driver: i915, radeon, ...
 104  *         This is the category used by the DRM_DEBUG_DRIVER() macro.
 105  *
 106  * KMS: used in the modesetting code.
 107  *      This is the category used by the DRM_DEBUG_KMS() macro.
 108  *
 109  * PRIME: used in the prime code.
 110  *        This is the category used by the DRM_DEBUG_PRIME() macro.
 111  *
 112  * ATOMIC: used in the atomic code.
 113  *        This is the category used by the DRM_DEBUG_ATOMIC() macro.
 114  *
 115  * VBL: used for verbose debug message in the vblank code
 116  *        This is the category used by the DRM_DEBUG_VBL() macro.
 117  *
 118  * Enabling verbose debug messages is done through the drm.debug parameter,
 119  * each category being enabled by a bit.
 120  *
 121  * drm.debug=0x1 will enable CORE messages
 122  * drm.debug=0x2 will enable DRIVER messages
 123  * drm.debug=0x3 will enable CORE and DRIVER messages
 124  * ...
 125  * drm.debug=0x3f will enable all messages
 126  *
 127  * An interesting feature is that it's possible to enable verbose logging at
 128  * run-time by echoing the debug value in its sysfs node:
 129  *   # echo 0xf > /sys/module/drm/parameters/debug
 130  */
 131 #define DRM_UT_NONE             0x00
 132 #define DRM_UT_CORE             0x01
 133 #define DRM_UT_DRIVER           0x02
 134 #define DRM_UT_KMS              0x04
 135 #define DRM_UT_PRIME            0x08
 136 #define DRM_UT_ATOMIC           0x10
 137 #define DRM_UT_VBL              0x20
 138
 139 extern __printf(6, 7)
 140 void drm_dev_printk(const struct device *dev, const char *level,
 141                     unsigned int category, const char *function_name,
 142                     const char *prefix, const char *format, ...);
 143
 144 extern __printf(3, 4)
 145 void drm_printk(const char *level, unsigned int category,
 146                 const char *format, ...);
 147
 148 /***********************************************************************/
 149 /** \name DRM template customization defaults */
 150 /*@{*/
 151
 152 /* driver capabilities and requirements mask */
 153 #define DRIVER_USE_AGP                  0x1
 154 #define DRIVER_LEGACY                   0x2
 155 #define DRIVER_PCI_DMA                  0x8
 156 #define DRIVER_SG                       0x10
 157 #define DRIVER_HAVE_DMA                 0x20
 158 #define DRIVER_HAVE_IRQ                 0x40
 159 #define DRIVER_IRQ_SHARED               0x80
 160 #define DRIVER_GEM                      0x1000
 161 #define DRIVER_MODESET                  0x2000
 162 #define DRIVER_PRIME                    0x4000
 163 #define DRIVER_RENDER                   0x8000
 164 #define DRIVER_ATOMIC                   0x10000
 165 #define DRIVER_KMS_LEGACY_CONTEXT       0x20000
 166
 167 /***********************************************************************/
 168 /** \name Macros to make printk easier */
 169 /*@{*/
 170
 171 #define _DRM_PRINTK(once, level, fmt, ...)                              \
 172         do {                                                            \
 173                 printk##once(KERN_##level "[" DRM_NAME "] " fmt,        \
 174                              ##__VA_ARGS__);                            \
 175         } while (0)
 176
 177 #define DRM_INFO(fmt, ...)                                              \
 178         _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
 179 #define DRM_NOTE(fmt, ...)                                              \
 180         _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
 181 #define DRM_WARN(fmt, ...)                                              \
 182         _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
 183
 184 #define DRM_INFO_ONCE(fmt, ...)                                         \
 185         _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
 186 #define DRM_NOTE_ONCE(fmt, ...)                                         \
 187         _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
 188 #define DRM_WARN_ONCE(fmt, ...)                                         \
 189         _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
 190
 191 /**
 192  * Error output.
 193  *
 194  * \param fmt printf() like format string.
 195  * \param arg arguments
 196  */
 197 #define DRM_DEV_ERROR(dev, fmt, ...)                                    \
 198         drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
 199                        fmt, ##__VA_ARGS__)
 200 #define DRM_ERROR(fmt, ...)                                             \
 201         drm_printk(KERN_ERR, DRM_UT_NONE, fmt,  ##__VA_ARGS__)
 202
 203 /**
 204  * Rate limited error output.  Like DRM_ERROR() but won't flood the log.
 205  *
 206  * \param fmt printf() like format string.
 207  * \param arg arguments
 208  */
 209 #define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...)                        \
 210 ({                                                                      \
 211         static DEFINE_RATELIMIT_STATE(_rs,                              \
 212                                       DEFAULT_RATELIMIT_INTERVAL,       \
 213                                       DEFAULT_RATELIMIT_BURST);         \
 214                                                                         \
 215         if (__ratelimit(&_rs))                                          \
 216                 DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__);                 \
 217 })
 218 #define DRM_ERROR_RATELIMITED(fmt, ...)                                 \
 219         DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
 220
 221 #define DRM_DEV_INFO(dev, fmt, ...)                                     \
 222         drm_dev_printk(dev, KERN_INFO, DRM_UT_NONE, __func__, "", fmt,  \
 223                        ##__VA_ARGS__)
 224
 225 #define DRM_DEV_INFO_ONCE(dev, fmt, ...)                                \
 226 ({                                                                      \
 227         static bool __print_once __read_mostly;                         \
 228         if (!__print_once) {                                            \
 229                 __print_once = true;                                    \
 230                 DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__);                  \
 231         }                                                               \
 232 })
 233
 234 /**
 235  * Debug output.
 236  *
 237  * \param fmt printf() like format string.
 238  * \param arg arguments
 239  */
 240 #define DRM_DEV_DEBUG(dev, fmt, args...)                                \
 241         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt, \
 242                        ##args)
 243 #define DRM_DEBUG(fmt, ...)                                             \
 244         drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
 245
 246 #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...)                         \
 247         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "",    \
 248                        fmt, ##args)
 249 #define DRM_DEBUG_DRIVER(fmt, ...)                                      \
 250         drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
 251
 252 #define DRM_DEV_DEBUG_KMS(dev, fmt, args...)                            \
 253         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt,  \
 254                        ##args)
 255 #define DRM_DEBUG_KMS(fmt, ...)                                 \
 256         drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
 257
 258 #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...)                          \
 259         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "",     \
 260                        fmt, ##args)
 261 #define DRM_DEBUG_PRIME(fmt, ...)                                       \
 262         drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
 263
 264 #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...)                         \
 265         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "",    \
 266                        fmt, ##args)
 267 #define DRM_DEBUG_ATOMIC(fmt, ...)                                      \
 268         drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
 269
 270 #define DRM_DEV_DEBUG_VBL(dev, fmt, args...)                            \
 271         drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt,  \
 272                        ##args)
 273 #define DRM_DEBUG_VBL(fmt, ...)                                 \
 274         drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
 275
 276 #define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...)     \
 277 ({                                                                      \
 278         static DEFINE_RATELIMIT_STATE(_rs,                              \
 279                                       DEFAULT_RATELIMIT_INTERVAL,       \
 280                                       DEFAULT_RATELIMIT_BURST);         \
 281         if (__ratelimit(&_rs))                                          \
 282                 drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ ## level,       \
 283                                __func__, "", fmt, ##args);              \
 284 })
 285
 286 /**
 287  * Rate limited debug output. Like DRM_DEBUG() but won't flood the log.
 288  *
 289  * \param fmt printf() like format string.
 290  * \param arg arguments
 291  */
 292 #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, args...)                    \
 293         DEV__DRM_DEFINE_DEBUG_RATELIMITED(dev, CORE, fmt, ##args)
 294 #define DRM_DEBUG_RATELIMITED(fmt, args...)                             \
 295         DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##args)
 296 #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, args...)             \
 297         _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRIVER, fmt, ##args)
 298 #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, args...)                      \
 299         DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##args)
 300 #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, args...)                \
 301         _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, KMS, fmt, ##args)
 302 #define DRM_DEBUG_KMS_RATELIMITED(fmt, args...)                         \
 303         DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##args)
 304 #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, args...)              \
 305         _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, PRIME, fmt, ##args)
 306 #define DRM_DEBUG_PRIME_RATELIMITED(fmt, args...)                       \
 307         DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##args)
 308
 309 /*@}*/
 310
 311 /***********************************************************************/
 312 /** \name Internal types and structures */
 313 /*@{*/
 314
 315 #define DRM_IF_VERSION(maj, min) (maj << 16 | min)
 316
 317 /**
 318  * Ioctl function type.
 319  *
 320  * \param inode device inode.
 321  * \param file_priv DRM file private pointer.
 322  * \param cmd command.
 323  * \param arg argument.
 324  */
 325 typedef int drm_ioctl_t(struct drm_device *dev, void *data,
 326                         struct drm_file *file_priv);
 327
 328 typedef int drm_ioctl_compat_t(struct file *filp, unsigned int cmd,
 329                                unsigned long arg);
 330
 331 #define DRM_IOCTL_NR(n)                _IOC_NR(n)
 332 #define DRM_MAJOR       226
 333
 334 #define DRM_AUTH        0x1
 335 #define DRM_MASTER      0x2
 336 #define DRM_ROOT_ONLY   0x4
 337 #define DRM_CONTROL_ALLOW 0x8
 338 #define DRM_UNLOCKED    0x10
 339 #define DRM_RENDER_ALLOW 0x20
 340
 341 struct drm_ioctl_desc {
 342         unsigned int cmd;
 343         int flags;
 344         drm_ioctl_t *func;
 345         const char *name;
 346 };
 347
 348 /**
 349  * Creates a driver or general drm_ioctl_desc array entry for the given
 350  * ioctl, for use by drm_ioctl().
 351  */
 352
 353 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)                         \
 354         [DRM_IOCTL_NR(DRM_IOCTL_##ioctl) - DRM_COMMAND_BASE] = {        \
 355                 .cmd = DRM_IOCTL_##ioctl,                               \
 356                 .func = _func,                                          \
 357                 .flags = _flags,                                        \
 358                 .name = #ioctl                                          \
 359          }
 360
 361 /* Event queued up for userspace to read */
 362 struct drm_pending_event {
 363         struct completion *completion;
 364         void (*completion_release)(struct completion *completion);
 365         struct drm_event *event;
 366         struct fence *fence;
 367         struct list_head link;
 368         struct list_head pending_link;
 369         struct drm_file *file_priv;
 370         pid_t pid; /* pid of requester, no guarantee it's valid by the time
 371                       we deliver the event, for tracing only */
 372 };
 373
 374 struct drm_prime_file_private {
 375         struct mutex lock;
 376         struct rb_root dmabufs;
 377         struct rb_root handles;
 378 };
 379
 380 /** File private data */
 381 struct drm_file {
 382         unsigned authenticated :1;
 383         /* true when the client has asked us to expose stereo 3D mode flags */
 384         unsigned stereo_allowed :1;
 385         /*
 386          * true if client understands CRTC primary planes and cursor planes
 387          * in the plane list
 388          */
 389         unsigned universal_planes:1;
 390         /* true if client understands atomic properties */
 391         unsigned atomic:1;
 392         /*
 393          * This client is the creator of @master.
 394          * Protected by struct drm_device::master_mutex.
 395          */
 396         unsigned is_master:1;
 397
 398         struct pid *pid;
 399         drm_magic_t magic;
 400         struct list_head lhead;
 401         struct drm_minor *minor;
 402         unsigned long lock_count;
 403
 404         /** Mapping of mm object handles to object pointers. */
 405         struct idr object_idr;
 406         /** Lock for synchronization of access to object_idr. */
 407         spinlock_t table_lock;
 408
 409         struct file *filp;
 410         void *driver_priv;
 411
 412         struct drm_master *master; /* master this node is currently associated with
 413                                       N.B. not always dev->master */
 414         /**
 415          * fbs - List of framebuffers associated with this file.
 416          *
 417          * Protected by fbs_lock. Note that the fbs list holds a reference on
 418          * the fb object to prevent it from untimely disappearing.
 419          */
 420         struct list_head fbs;
 421         struct mutex fbs_lock;
 422
 423         /** User-created blob properties; this retains a reference on the
 424          *  property. */
 425         struct list_head blobs;
 426
 427         wait_queue_head_t event_wait;
 428         struct list_head pending_event_list;
 429         struct list_head event_list;
 430         int event_space;
 431
 432         struct mutex event_read_lock;
 433
 434         struct drm_prime_file_private prime;
 435 };
 436
 437 /**
 438  * Lock data.
 439  */
 440 struct drm_lock_data {
 441         struct drm_hw_lock *hw_lock;    /**< Hardware lock */
 442         /** Private of lock holder's file (NULL=kernel) */
 443         struct drm_file *file_priv;
 444         wait_queue_head_t lock_queue;   /**< Queue of blocked processes */
 445         unsigned long lock_time;        /**< Time of last lock in jiffies */
 446         spinlock_t spinlock;
 447         uint32_t kernel_waiters;
 448         uint32_t user_waiters;
 449         int idle_has_lock;
 450 };
 451
 452 /* Flags and return codes for get_vblank_timestamp() driver function. */
 453 #define DRM_CALLED_FROM_VBLIRQ 1
 454 #define DRM_VBLANKTIME_SCANOUTPOS_METHOD (1 << 0)
 455 #define DRM_VBLANKTIME_IN_VBLANK         (1 << 1)
 456
 457 /* get_scanout_position() return flags */
 458 #define DRM_SCANOUTPOS_VALID        (1 << 0)
 459 #define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
 460 #define DRM_SCANOUTPOS_ACCURATE     (1 << 2)
 461
 462 /**
 463  * DRM driver structure. This structure represent the common code for
 464  * a family of cards. There will one drm_device for each card present
 465  * in this family
 466  */
 467 struct drm_driver {
 468         int (*load) (struct drm_device *, unsigned long flags);
 469         int (*firstopen) (struct drm_device *);
 470         int (*open) (struct drm_device *, struct drm_file *);
 471         void (*preclose) (struct drm_device *, struct drm_file *file_priv);
 472         void (*postclose) (struct drm_device *, struct drm_file *);
 473         void (*lastclose) (struct drm_device *);
 474         int (*unload) (struct drm_device *);
 475         int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
 476         int (*dma_quiescent) (struct drm_device *);
 477         int (*context_dtor) (struct drm_device *dev, int context);
 478         int (*set_busid)(struct drm_device *dev, struct drm_master *master);
 479
 480         /**
 481          * get_vblank_counter - get raw hardware vblank counter
 482          * @dev: DRM device
 483          * @pipe: counter to fetch
 484          *
 485          * Driver callback for fetching a raw hardware vblank counter for @crtc.
 486          * If a device doesn't have a hardware counter, the driver can simply
 487          * use drm_vblank_no_hw_counter() function. The DRM core will account for
 488          * missed vblank events while interrupts where disabled based on system
 489          * timestamps.
 490          *
 491          * Wraparound handling and loss of events due to modesetting is dealt
 492          * with in the DRM core code.
 493          *
 494          * RETURNS
 495          * Raw vblank counter value.
 496          */
 497         u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
 498
 499         /**
 500          * enable_vblank - enable vblank interrupt events
 501          * @dev: DRM device
 502          * @pipe: which irq to enable
 503          *
 504          * Enable vblank interrupts for @crtc.  If the device doesn't have
 505          * a hardware vblank counter, the driver should use the
 506          * drm_vblank_no_hw_counter() function that keeps a virtual counter.
 507          *
 508          * RETURNS
 509          * Zero on success, appropriate errno if the given @crtc's vblank
 510          * interrupt cannot be enabled.
 511          */
 512         int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
 513
 514         /**
 515          * disable_vblank - disable vblank interrupt events
 516          * @dev: DRM device
 517          * @pipe: which irq to enable
 518          *
 519          * Disable vblank interrupts for @crtc.  If the device doesn't have
 520          * a hardware vblank counter, the driver should use the
 521          * drm_vblank_no_hw_counter() function that keeps a virtual counter.
 522          */
 523         void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
 524
 525         /**
 526          * Called by \c drm_device_is_agp.  Typically used to determine if a
 527          * card is really attached to AGP or not.
 528          *
 529          * \param dev  DRM device handle
 530          *
 531          * \returns
 532          * One of three values is returned depending on whether or not the
 533          * card is absolutely \b not AGP (return of 0), absolutely \b is AGP
 534          * (return of 1), or may or may not be AGP (return of 2).
 535          */
 536         int (*device_is_agp) (struct drm_device *dev);
 537
 538         /**
 539          * Called by vblank timestamping code.
 540          *
 541          * Return the current display scanout position from a crtc, and an
 542          * optional accurate ktime_get timestamp of when position was measured.
 543          *
 544          * \param dev  DRM device.
 545          * \param pipe Id of the crtc to query.
 546          * \param flags Flags from the caller (DRM_CALLED_FROM_VBLIRQ or 0).
 547          * \param *vpos Target location for current vertical scanout position.
 548          * \param *hpos Target location for current horizontal scanout position.
 549          * \param *stime Target location for timestamp taken immediately before
 550          *               scanout position query. Can be NULL to skip timestamp.
 551          * \param *etime Target location for timestamp taken immediately after
 552          *               scanout position query. Can be NULL to skip timestamp.
 553          * \param mode Current display timings.
 554          *
 555          * Returns vpos as a positive number while in active scanout area.
 556          * Returns vpos as a negative number inside vblank, counting the number
 557          * of scanlines to go until end of vblank, e.g., -1 means "one scanline
 558          * until start of active scanout / end of vblank."
 559          *
 560          * \return Flags, or'ed together as follows:
 561          *
 562          * DRM_SCANOUTPOS_VALID = Query successful.
 563          * DRM_SCANOUTPOS_INVBL = Inside vblank.
 564          * DRM_SCANOUTPOS_ACCURATE = Returned position is accurate. A lack of
 565          * this flag means that returned position may be offset by a constant
 566          * but unknown small number of scanlines wrt. real scanout position.
 567          *
 568          */
 569         int (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
 570                                      unsigned int flags, int *vpos, int *hpos,
 571                                      ktime_t *stime, ktime_t *etime,
 572                                      const struct drm_display_mode *mode);
 573
 574         /**
 575          * Called by \c drm_get_last_vbltimestamp. Should return a precise
 576          * timestamp when the most recent VBLANK interval ended or will end.
 577          *
 578          * Specifically, the timestamp in @vblank_time should correspond as
 579          * closely as possible to the time when the first video scanline of
 580          * the video frame after the end of VBLANK will start scanning out,
 581          * the time immediately after end of the VBLANK interval. If the
 582          * @crtc is currently inside VBLANK, this will be a time in the future.
 583          * If the @crtc is currently scanning out a frame, this will be the
 584          * past start time of the current scanout. This is meant to adhere
 585          * to the OpenML OML_sync_control extension specification.
 586          *
 587          * \param dev dev DRM device handle.
 588          * \param pipe crtc for which timestamp should be returned.
 589          * \param *max_error Maximum allowable timestamp error in nanoseconds.
 590          *                   Implementation should strive to provide timestamp
 591          *                   with an error of at most *max_error nanoseconds.
 592          *                   Returns true upper bound on error for timestamp.
 593          * \param *vblank_time Target location for returned vblank timestamp.
 594          * \param flags 0 = Defaults, no special treatment needed.
 595          * \param       DRM_CALLED_FROM_VBLIRQ = Function is called from vblank
 596          *              irq handler. Some drivers need to apply some workarounds
 597          *              for gpu-specific vblank irq quirks if flag is set.
 598          *
 599          * \returns
 600          * Zero if timestamping isn't supported in current display mode or a
 601          * negative number on failure. A positive status code on success,
 602          * which describes how the vblank_time timestamp was computed.
 603          */
 604         int (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
 605                                      int *max_error,
 606                                      struct timeval *vblank_time,
 607                                      unsigned flags);
 608
 609         /* these have to be filled in */
 610
 611         irqreturn_t(*irq_handler) (int irq, void *arg);
 612         void (*irq_preinstall) (struct drm_device *dev);
 613         int (*irq_postinstall) (struct drm_device *dev);
 614         void (*irq_uninstall) (struct drm_device *dev);
 615
 616         /* Master routines */
 617         int (*master_create)(struct drm_device *dev, struct drm_master *master);
 618         void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
 619         /**
 620          * master_set is called whenever the minor master is set.
 621          * master_drop is called whenever the minor master is dropped.
 622          */
 623
 624         int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
 625                           bool from_open);
 626         void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
 627
 628         int (*debugfs_init)(struct drm_minor *minor);
 629         void (*debugfs_cleanup)(struct drm_minor *minor);
 630
 631         /**
 632          * @gem_free_object: deconstructor for drm_gem_objects
 633          *
 634          * This is deprecated and should not be used by new drivers. Use
 635          * @gem_free_object_unlocked instead.
 636          */
 637         void (*gem_free_object) (struct drm_gem_object *obj);
 638
 639         /**
 640          * @gem_free_object_unlocked: deconstructor for drm_gem_objects
 641          *
 642          * This is for drivers which are not encumbered with dev->struct_mutex
 643          * legacy locking schemes. Use this hook instead of @gem_free_object.
 644          */
 645         void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
 646
 647         int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
 648         void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
 649
 650         /**
 651          * Hook for allocating the GEM object struct, for use by core
 652          * helpers.
 653          */
 654         struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
 655                                                     size_t size);
 656
 657         /* prime: */
 658         /* export handle -> fd (see drm_gem_prime_handle_to_fd() helper) */
 659         int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
 660                                 uint32_t handle, uint32_t flags, int *prime_fd);
 661         /* import fd -> handle (see drm_gem_prime_fd_to_handle() helper) */
 662         int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
 663                                 int prime_fd, uint32_t *handle);
 664         /* export GEM -> dmabuf */
 665         struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
 666                                 struct drm_gem_object *obj, int flags);
 667         /* import dmabuf -> GEM */
 668         struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
 669                                 struct dma_buf *dma_buf);
 670         /* low-level interface used by drm_gem_prime_{import,export} */
 671         int (*gem_prime_pin)(struct drm_gem_object *obj);
 672         void (*gem_prime_unpin)(struct drm_gem_object *obj);
 673         struct reservation_object * (*gem_prime_res_obj)(
 674                                 struct drm_gem_object *obj);
 675         struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
 676         struct drm_gem_object *(*gem_prime_import_sg_table)(
 677                                 struct drm_device *dev,
 678                                 struct dma_buf_attachment *attach,
 679                                 struct sg_table *sgt);
 680         void *(*gem_prime_vmap)(struct drm_gem_object *obj);
 681         void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
 682         int (*gem_prime_mmap)(struct drm_gem_object *obj,
 683                                 struct vm_area_struct *vma);
 684
 685         /* vga arb irq handler */
 686         void (*vgaarb_irq)(struct drm_device *dev, bool state);
 687
 688         /* dumb alloc support */
 689         int (*dumb_create)(struct drm_file *file_priv,
 690                            struct drm_device *dev,
 691                            struct drm_mode_create_dumb *args);
 692         int (*dumb_map_offset)(struct drm_file *file_priv,
 693                                struct drm_device *dev, uint32_t handle,
 694                                uint64_t *offset);
 695         int (*dumb_destroy)(struct drm_file *file_priv,
 696                             struct drm_device *dev,
 697                             uint32_t handle);
 698
 699         /* Driver private ops for this object */
 700         const struct vm_operations_struct *gem_vm_ops;
 701
 702         int major;
 703         int minor;
 704         int patchlevel;
 705         char *name;
 706         char *desc;
 707         char *date;
 708
 709         u32 driver_features;
 710         int dev_priv_size;
 711         const struct drm_ioctl_desc *ioctls;
 712         int num_ioctls;
 713         const struct file_operations *fops;
 714
 715         /* List of devices hanging off this driver with stealth attach. */
 716         struct list_head legacy_dev_list;
 717 };
 718
 719 enum drm_minor_type {
 720         DRM_MINOR_PRIMARY,
 721         DRM_MINOR_CONTROL,
 722         DRM_MINOR_RENDER,
 723         DRM_MINOR_CNT,
 724 };
 725
 726 /**
 727  * Info file list entry. This structure represents a debugfs or proc file to
 728  * be created by the drm core
 729  */
 730 struct drm_info_list {
 731         const char *name; /** file name */
 732         int (*show)(struct seq_file*, void*); /** show callback */
 733         u32 driver_features; /**< Required driver features for this entry */
 734         void *data;
 735 };
 736
 737 /**
 738  * debugfs node structure. This structure represents a debugfs file.
 739  */
 740 struct drm_info_node {
 741         struct list_head list;
 742         struct drm_minor *minor;
 743         const struct drm_info_list *info_ent;
 744         struct dentry *dent;
 745 };
 746
 747 /**
 748  * DRM minor structure. This structure represents a drm minor number.
 749  */
 750 struct drm_minor {
 751         int index;                      /**< Minor device number */
 752         int type;                       /**< Control or render */
 753         struct device *kdev;            /**< Linux device */
 754         struct drm_device *dev;
 755
 756         struct dentry *debugfs_root;
 757
 758         struct list_head debugfs_list;
 759         struct mutex debugfs_lock; /* Protects debugfs_list. */
 760 };
 761
 762 /**
 763  * DRM device structure. This structure represent a complete card that
 764  * may contain multiple heads.
 765  */
 766 struct drm_device {
 767         struct list_head legacy_dev_list;/**< list of devices per driver for stealth attach cleanup */
 768         int if_version;                 /**< Highest interface version set */
 769
 770         /** \name Lifetime Management */
 771         /*@{ */
 772         struct kref ref;                /**< Object ref-count */
 773         struct device *dev;             /**< Device structure of bus-device */
 774         struct drm_driver *driver;      /**< DRM driver managing the device */
 775         void *dev_private;              /**< DRM driver private data */
 776         struct drm_minor *control;              /**< Control node */
 777         struct drm_minor *primary;              /**< Primary node */
 778         struct drm_minor *render;               /**< Render node */
 779
 780         /* currently active master for this device. Protected by master_mutex */
 781         struct drm_master *master;
 782
 783         atomic_t unplugged;                     /**< Flag whether dev is dead */
 784         struct inode *anon_inode;               /**< inode for private address-space */
 785         char *unique;                           /**< unique name of the device */
 786         /*@} */
 787
 788         /** \name Locks */
 789         /*@{ */
 790         struct mutex struct_mutex;      /**< For others */
 791         struct mutex master_mutex;      /**< For drm_minor::master and drm_file::is_master */
 792         /*@} */
 793
 794         /** \name Usage Counters */
 795         /*@{ */
 796         int open_count;                 /**< Outstanding files open, protected by drm_global_mutex. */
 797         spinlock_t buf_lock;            /**< For drm_device::buf_use and a few other things. */
 798         int buf_use;                    /**< Buffers in use -- cannot alloc */
 799         atomic_t buf_alloc;             /**< Buffer allocation in progress */
 800         /*@} */
 801
 802         struct mutex filelist_mutex;
 803         struct list_head filelist;
 804
 805         /** \name Memory management */
 806         /*@{ */
 807         struct list_head maplist;       /**< Linked list of regions */
 808         struct drm_open_hash map_hash;  /**< User token hash table for maps */
 809
 810         /** \name Context handle management */
 811         /*@{ */
 812         struct list_head ctxlist;       /**< Linked list of context handles */
 813         struct mutex ctxlist_mutex;     /**< For ctxlist */
 814
 815         struct idr ctx_idr;
 816
 817         struct list_head vmalist;       /**< List of vmas (for debugging) */
 818
 819         /*@} */
 820
 821         /** \name DMA support */
 822         /*@{ */
 823         struct drm_device_dma *dma;             /**< Optional pointer for DMA support */
 824         /*@} */
 825
 826         /** \name Context support */
 827         /*@{ */
 828
 829         __volatile__ long context_flag; /**< Context swapping flag */
 830         int last_context;               /**< Last current context */
 831         /*@} */
 832
 833         /** \name VBLANK IRQ support */
 834         /*@{ */
 835         bool irq_enabled;
 836         int irq;
 837
 838         /*
 839          * If true, vblank interrupt will be disabled immediately when the
 840          * refcount drops to zero, as opposed to via the vblank disable
 841          * timer.
 842          * This can be set to true it the hardware has a working vblank
 843          * counter and the driver uses drm_vblank_on() and drm_vblank_off()
 844          * appropriately.
 845          */
 846         bool vblank_disable_immediate;
 847
 848         /* array of size num_crtcs */
 849         struct drm_vblank_crtc *vblank;
 850
 851         spinlock_t vblank_time_lock;    /**< Protects vblank count and time updates during vblank enable/disable */
 852         spinlock_t vbl_lock;
 853
 854         u32 max_vblank_count;           /**< size of vblank counter register */
 855
 856         /**
 857          * List of events
 858          */
 859         struct list_head vblank_event_list;
 860         spinlock_t event_lock;
 861
 862         /*@} */
 863
 864         struct drm_agp_head *agp;       /**< AGP data */
 865
 866         struct pci_dev *pdev;           /**< PCI device structure */
 867 #ifdef __alpha__
 868         struct pci_controller *hose;
 869 #endif
 870
 871         struct platform_device *platformdev; /**< Platform device struture */
 872         struct virtio_device *virtdev;
 873
 874         struct drm_sg_mem *sg;  /**< Scatter gather memory */
 875         unsigned int num_crtcs;                  /**< Number of CRTCs on this device */
 876
 877         struct {
 878                 int context;
 879                 struct drm_hw_lock *lock;
 880         } sigdata;
 881
 882         struct drm_local_map *agp_buffer_map;
 883         unsigned int agp_buffer_token;
 884
 885         struct drm_mode_config mode_config;     /**< Current mode config */
 886
 887         /** \name GEM information */
 888         /*@{ */
 889         struct mutex object_name_lock;
 890         struct idr object_name_idr;
 891         struct drm_vma_offset_manager *vma_offset_manager;
 892         /*@} */
 893         int switch_power_state;
 894 };
 895
 896 #include <drm/drm_irq.h>
 897
 898 #define DRM_SWITCH_POWER_ON 0
 899 #define DRM_SWITCH_POWER_OFF 1
 900 #define DRM_SWITCH_POWER_CHANGING 2
 901 #define DRM_SWITCH_POWER_DYNAMIC_OFF 3
 902
 903 static __inline__ int drm_core_check_feature(struct drm_device *dev,
 904                                              int feature)
 905 {
 906         return ((dev->driver->driver_features & feature) ? 1 : 0);
 907 }
 908
 909 static inline void drm_device_set_unplugged(struct drm_device *dev)
 910 {
 911         smp_wmb();
 912         atomic_set(&dev->unplugged, 1);
 913 }
 914
 915 static inline int drm_device_is_unplugged(struct drm_device *dev)
 916 {
 917         int ret = atomic_read(&dev->unplugged);
 918         smp_rmb();
 919         return ret;
 920 }
 921
 922 static inline bool drm_is_render_client(const struct drm_file *file_priv)
 923 {
 924         return file_priv->minor->type == DRM_MINOR_RENDER;
 925 }
 926
 927 static inline bool drm_is_control_client(const struct drm_file *file_priv)
 928 {
 929         return file_priv->minor->type == DRM_MINOR_CONTROL;
 930 }
 931
 932 static inline bool drm_is_primary_client(const struct drm_file *file_priv)
 933 {
 934         return file_priv->minor->type == DRM_MINOR_PRIMARY;
 935 }
 936
 937 /******************************************************************/
 938 /** \name Internal function definitions */
 939 /*@{*/
 940
 941                                 /* Driver support (drm_drv.h) */
 942 extern int drm_ioctl_permit(u32 flags, struct drm_file *file_priv);
 943 extern long drm_ioctl(struct file *filp,
 944                       unsigned int cmd, unsigned long arg);
 945 extern long drm_compat_ioctl(struct file *filp,
 946                              unsigned int cmd, unsigned long arg);
 947 extern bool drm_ioctl_flags(unsigned int nr, unsigned int *flags);
 948
 949 /* File Operations (drm_fops.c) */
 950 int drm_open(struct inode *inode, struct file *filp);
 951 ssize_t drm_read(struct file *filp, char __user *buffer,
 952                  size_t count, loff_t *offset);
 953 int drm_release(struct inode *inode, struct file *filp);
 954 unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);
 955 int drm_event_reserve_init_locked(struct drm_device *dev,
 956                                   struct drm_file *file_priv,
 957                                   struct drm_pending_event *p,
 958                                   struct drm_event *e);
 959 int drm_event_reserve_init(struct drm_device *dev,
 960                            struct drm_file *file_priv,
 961                            struct drm_pending_event *p,
 962                            struct drm_event *e);
 963 void drm_event_cancel_free(struct drm_device *dev,
 964                            struct drm_pending_event *p);
 965 void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e);
 966 void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
 967
 968 /* Misc. IOCTL support (drm_ioctl.c) */
 969 int drm_noop(struct drm_device *dev, void *data,
 970              struct drm_file *file_priv);
 971 int drm_invalid_op(struct drm_device *dev, void *data,
 972                    struct drm_file *file_priv);
 973
 974 /* Cache management (drm_cache.c) */
 975 void drm_clflush_pages(struct page *pages[], unsigned long num_pages);
 976 void drm_clflush_sg(struct sg_table *st);
 977 void drm_clflush_virt_range(void *addr, unsigned long length);
 978
 979 /*
 980  * These are exported to drivers so that they can implement fencing using
 981  * DMA quiscent + idle. DMA quiescent usually requires the hardware lock.
 982  */
 983
 984 /* Modesetting support */
 985 extern void drm_vblank_pre_modeset(struct drm_device *dev, unsigned int pipe);
 986 extern void drm_vblank_post_modeset(struct drm_device *dev, unsigned int pipe);
 987
 988 /* drm_drv.c */
 989 void drm_put_dev(struct drm_device *dev);
 990 void drm_unplug_dev(struct drm_device *dev);
 991 extern unsigned int drm_debug;
 992
 993                                 /* Debugfs support */
 994 #if defined(CONFIG_DEBUG_FS)
 995 extern int drm_debugfs_create_files(const struct drm_info_list *files,
 996                                     int count, struct dentry *root,
 997                                     struct drm_minor *minor);
 998 extern int drm_debugfs_remove_files(const struct drm_info_list *files,
 999                                     int count, struct drm_minor *minor);
1000 #else
1001 static inline int drm_debugfs_create_files(const struct drm_info_list *files,
1002                                            int count, struct dentry *root,
1003                                            struct drm_minor *minor)
1004 {
1005         return 0;
1006 }
1007
1008 static inline int drm_debugfs_remove_files(const struct drm_info_list *files,
1009                                            int count, struct drm_minor *minor)
1010 {
1011         return 0;
1012 }
1013 #endif
1014
1015 struct dma_buf_export_info;
1016
1017 extern struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
1018                                             struct drm_gem_object *obj,
1019                                             int flags);
1020 extern int drm_gem_prime_handle_to_fd(struct drm_device *dev,
1021                 struct drm_file *file_priv, uint32_t handle, uint32_t flags,
1022                 int *prime_fd);
1023 extern struct drm_gem_object *drm_gem_prime_import(struct drm_device *dev,
1024                 struct dma_buf *dma_buf);
1025 extern int drm_gem_prime_fd_to_handle(struct drm_device *dev,
1026                 struct drm_file *file_priv, int prime_fd, uint32_t *handle);
1027 struct dma_buf *drm_gem_dmabuf_export(struct drm_device *dev,
1028                                       struct dma_buf_export_info *exp_info);
1029 extern void drm_gem_dmabuf_release(struct dma_buf *dma_buf);
1030
1031 extern int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
1032                                             dma_addr_t *addrs, int max_pages);
1033 extern struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages);
1034 extern void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg);
1035
1036
1037 extern struct drm_dma_handle *drm_pci_alloc(struct drm_device *dev, size_t size,
1038                                             size_t align);
1039 extern void drm_pci_free(struct drm_device *dev, struct drm_dma_handle * dmah);
1040
1041                                /* sysfs support (drm_sysfs.c) */
1042 extern void drm_sysfs_hotplug_event(struct drm_device *dev);
1043
1044
1045 struct drm_device *drm_dev_alloc(struct drm_driver *driver,
1046                                  struct device *parent);
1047 int drm_dev_init(struct drm_device *dev,
1048                  struct drm_driver *driver,
1049                  struct device *parent);
1050 void drm_dev_ref(struct drm_device *dev);
1051 void drm_dev_unref(struct drm_device *dev);
1052 int drm_dev_register(struct drm_device *dev, unsigned long flags);
1053 void drm_dev_unregister(struct drm_device *dev);
1054
1055 struct drm_minor *drm_minor_acquire(unsigned int minor_id);
1056 void drm_minor_release(struct drm_minor *minor);
1057
1058 /*@}*/
1059
1060 /* PCI section */
1061 static __inline__ int drm_pci_device_is_agp(struct drm_device *dev)
1062 {
1063         if (dev->driver->device_is_agp != NULL) {
1064                 int err = (*dev->driver->device_is_agp) (dev);
1065
1066                 if (err != 2) {
1067                         return err;
1068                 }
1069         }
1070
1071         return pci_find_capability(dev->pdev, PCI_CAP_ID_AGP);
1072 }
1073 void drm_pci_agp_destroy(struct drm_device *dev);
1074
1075 extern int drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver);
1076 extern void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver);
1077 #ifdef CONFIG_PCI
1078 extern int drm_get_pci_dev(struct pci_dev *pdev,
1079                            const struct pci_device_id *ent,
1080                            struct drm_driver *driver);
1081 extern int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master);
1082 #else
1083 static inline int drm_get_pci_dev(struct pci_dev *pdev,
1084                                   const struct pci_device_id *ent,
1085                                   struct drm_driver *driver)
1086 {
1087         return -ENOSYS;
1088 }
1089
1090 static inline int drm_pci_set_busid(struct drm_device *dev,
1091                                     struct drm_master *master)
1092 {
1093         return -ENOSYS;
1094 }
1095 #endif
1096
1097 #define DRM_PCIE_SPEED_25 1
1098 #define DRM_PCIE_SPEED_50 2
1099 #define DRM_PCIE_SPEED_80 4
1100
1101 extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);
1102 extern int drm_pcie_get_max_link_width(struct drm_device *dev, u32 *mlw);
1103
1104 /* platform section */
1105 extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);
1106
1107 /* returns true if currently okay to sleep */
1108 static __inline__ bool drm_can_sleep(void)
1109 {
1110         if (in_atomic() || in_dbg_master() || irqs_disabled())
1111                 return false;
1112         return true;
1113 }
1114
1115 /* helper for handling conditionals in various for_each macros */
1116 #define for_each_if(condition) if (!(condition)) {} else
1117
1118 #endif