include/drm/drm_drv.h

   1 /*
   2  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   3  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   4  * Copyright (c) 2009-2010, Code Aurora Forum.
   5  * Copyright 2016 Intel Corp.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the next
  15  * paragraph) shall be included in all copies or substantial portions of the
  16  * Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  22  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  23  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  24  * OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27 #ifndef _DRM_DRV_H_
  28 #define _DRM_DRV_H_
  29
  30 #include <linux/list.h>
  31 #include <linux/irqreturn.h>
  32
  33 #include <drm/drm_device.h>
  34
  35 struct drm_file;
  36 struct drm_gem_object;
  37 struct drm_master;
  38 struct drm_minor;
  39 struct dma_buf;
  40 struct dma_buf_attachment;
  41 struct drm_display_mode;
  42 struct drm_mode_create_dumb;
  43 struct drm_printer;
  44 struct sg_table;
  45
  46 /**
  47  * enum drm_driver_feature - feature flags
  48  *
  49  * See &drm_driver.driver_features, drm_device.driver_features and
  50  * drm_core_check_feature().
  51  */
  52 enum drm_driver_feature {
  53         /**
  54          * @DRIVER_GEM:
  55          *
  56          * Driver use the GEM memory manager. This should be set for all modern
  57          * drivers.
  58          */
  59         DRIVER_GEM                      = BIT(0),
  60         /**
  61          * @DRIVER_MODESET:
  62          *
  63          * Driver supports mode setting interfaces (KMS).
  64          */
  65         DRIVER_MODESET                  = BIT(1),
  66         /**
  67          * @DRIVER_RENDER:
  68          *
  69          * Driver supports dedicated render nodes. See also the :ref:`section on
  70          * render nodes <drm_render_node>` for details.
  71          */
  72         DRIVER_RENDER                   = BIT(3),
  73         /**
  74          * @DRIVER_ATOMIC:
  75          *
  76          * Driver supports the full atomic modesetting userspace API. Drivers
  77          * which only use atomic internally, but do not the support the full
  78          * userspace API (e.g. not all properties converted to atomic, or
  79          * multi-plane updates are not guaranteed to be tear-free) should not
  80          * set this flag.
  81          */
  82         DRIVER_ATOMIC                   = BIT(4),
  83         /**
  84          * @DRIVER_SYNCOBJ:
  85          *
  86          * Driver supports &drm_syncobj for explicit synchronization of command
  87          * submission.
  88          */
  89         DRIVER_SYNCOBJ                  = BIT(5),
  90         /**
  91          * @DRIVER_SYNCOBJ_TIMELINE:
  92          *
  93          * Driver supports the timeline flavor of &drm_syncobj for explicit
  94          * synchronization of command submission.
  95          */
  96         DRIVER_SYNCOBJ_TIMELINE         = BIT(6),
  97
  98         /* IMPORTANT: Below are all the legacy flags, add new ones above. */
  99
 100         /**
 101          * @DRIVER_USE_AGP:
 102          *
 103          * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage
 104          * AGP resources. New drivers don't need this.
 105          */
 106         DRIVER_USE_AGP                  = BIT(25),
 107         /**
 108          * @DRIVER_LEGACY:
 109          *
 110          * Denote a legacy driver using shadow attach. Do not use.
 111          */
 112         DRIVER_LEGACY                   = BIT(26),
 113         /**
 114          * @DRIVER_PCI_DMA:
 115          *
 116          * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace
 117          * will be enabled. Only for legacy drivers. Do not use.
 118          */
 119         DRIVER_PCI_DMA                  = BIT(27),
 120         /**
 121          * @DRIVER_SG:
 122          *
 123          * Driver can perform scatter/gather DMA, allocation and mapping of
 124          * scatter/gather buffers will be enabled. Only for legacy drivers. Do
 125          * not use.
 126          */
 127         DRIVER_SG                       = BIT(28),
 128
 129         /**
 130          * @DRIVER_HAVE_DMA:
 131          *
 132          * Driver supports DMA, the userspace DMA API will be supported. Only
 133          * for legacy drivers. Do not use.
 134          */
 135         DRIVER_HAVE_DMA                 = BIT(29),
 136         /**
 137          * @DRIVER_HAVE_IRQ:
 138          *
 139          * Legacy irq support. Only for legacy drivers. Do not use.
 140          *
 141          * New drivers can either use the drm_irq_install() and
 142          * drm_irq_uninstall() helper functions, or roll their own irq support
 143          * code by calling request_irq() directly.
 144          */
 145         DRIVER_HAVE_IRQ                 = BIT(30),
 146         /**
 147          * @DRIVER_KMS_LEGACY_CONTEXT:
 148          *
 149          * Used only by nouveau for backwards compatibility with existing
 150          * userspace.  Do not use.
 151          */
 152         DRIVER_KMS_LEGACY_CONTEXT       = BIT(31),
 153 };
 154
 155 /**
 156  * struct drm_driver - DRM driver structure
 157  *
 158  * This structure represent the common code for a family of cards. There will be
 159  * one &struct drm_device for each card present in this family. It contains lots
 160  * of vfunc entries, and a pile of those probably should be moved to more
 161  * appropriate places like &drm_mode_config_funcs or into a new operations
 162  * structure for GEM drivers.
 163  */
 164 struct drm_driver {
 165         /**
 166          * @load:
 167          *
 168          * Backward-compatible driver callback to complete initialization steps
 169          * after the driver is registered.  For this reason, may suffer from
 170          * race conditions and its use is deprecated for new drivers.  It is
 171          * therefore only supported for existing drivers not yet converted to
 172          * the new scheme.  See devm_drm_dev_alloc() and drm_dev_register() for
 173          * proper and race-free way to set up a &struct drm_device.
 174          *
 175          * This is deprecated, do not use!
 176          *
 177          * Returns:
 178          *
 179          * Zero on success, non-zero value on failure.
 180          */
 181         int (*load) (struct drm_device *, unsigned long flags);
 182
 183         /**
 184          * @open:
 185          *
 186          * Driver callback when a new &struct drm_file is opened. Useful for
 187          * setting up driver-private data structures like buffer allocators,
 188          * execution contexts or similar things. Such driver-private resources
 189          * must be released again in @postclose.
 190          *
 191          * Since the display/modeset side of DRM can only be owned by exactly
 192          * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
 193          * there should never be a need to set up any modeset related resources
 194          * in this callback. Doing so would be a driver design bug.
 195          *
 196          * Returns:
 197          *
 198          * 0 on success, a negative error code on failure, which will be
 199          * promoted to userspace as the result of the open() system call.
 200          */
 201         int (*open) (struct drm_device *, struct drm_file *);
 202
 203         /**
 204          * @postclose:
 205          *
 206          * One of the driver callbacks when a new &struct drm_file is closed.
 207          * Useful for tearing down driver-private data structures allocated in
 208          * @open like buffer allocators, execution contexts or similar things.
 209          *
 210          * Since the display/modeset side of DRM can only be owned by exactly
 211          * one &struct drm_file (see &drm_file.is_master and &drm_device.master)
 212          * there should never be a need to tear down any modeset related
 213          * resources in this callback. Doing so would be a driver design bug.
 214          */
 215         void (*postclose) (struct drm_device *, struct drm_file *);
 216
 217         /**
 218          * @lastclose:
 219          *
 220          * Called when the last &struct drm_file has been closed and there's
 221          * currently no userspace client for the &struct drm_device.
 222          *
 223          * Modern drivers should only use this to force-restore the fbdev
 224          * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
 225          * Anything else would indicate there's something seriously wrong.
 226          * Modern drivers can also use this to execute delayed power switching
 227          * state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
 228          * infrastructure.
 229          *
 230          * This is called after @postclose hook has been called.
 231          *
 232          * NOTE:
 233          *
 234          * All legacy drivers use this callback to de-initialize the hardware.
 235          * This is purely because of the shadow-attach model, where the DRM
 236          * kernel driver does not really own the hardware. Instead ownershipe is
 237          * handled with the help of userspace through an inheritedly racy dance
 238          * to set/unset the VT into raw mode.
 239          *
 240          * Legacy drivers initialize the hardware in the @firstopen callback,
 241          * which isn't even called for modern drivers.
 242          */
 243         void (*lastclose) (struct drm_device *);
 244
 245         /**
 246          * @unload:
 247          *
 248          * Reverse the effects of the driver load callback.  Ideally,
 249          * the clean up performed by the driver should happen in the
 250          * reverse order of the initialization.  Similarly to the load
 251          * hook, this handler is deprecated and its usage should be
 252          * dropped in favor of an open-coded teardown function at the
 253          * driver layer.  See drm_dev_unregister() and drm_dev_put()
 254          * for the proper way to remove a &struct drm_device.
 255          *
 256          * The unload() hook is called right after unregistering
 257          * the device.
 258          *
 259          */
 260         void (*unload) (struct drm_device *);
 261
 262         /**
 263          * @release:
 264          *
 265          * Optional callback for destroying device data after the final
 266          * reference is released, i.e. the device is being destroyed.
 267          *
 268          * This is deprecated, clean up all memory allocations associated with a
 269          * &drm_device using drmm_add_action(), drmm_kmalloc() and related
 270          * managed resources functions.
 271          */
 272         void (*release) (struct drm_device *);
 273
 274         /**
 275          * @irq_handler:
 276          *
 277          * Interrupt handler called when using drm_irq_install(). Not used by
 278          * drivers which implement their own interrupt handling.
 279          */
 280         irqreturn_t(*irq_handler) (int irq, void *arg);
 281
 282         /**
 283          * @irq_preinstall:
 284          *
 285          * Optional callback used by drm_irq_install() which is called before
 286          * the interrupt handler is registered. This should be used to clear out
 287          * any pending interrupts (from e.g. firmware based drives) and reset
 288          * the interrupt handling registers.
 289          */
 290         void (*irq_preinstall) (struct drm_device *dev);
 291
 292         /**
 293          * @irq_postinstall:
 294          *
 295          * Optional callback used by drm_irq_install() which is called after
 296          * the interrupt handler is registered. This should be used to enable
 297          * interrupt generation in the hardware.
 298          */
 299         int (*irq_postinstall) (struct drm_device *dev);
 300
 301         /**
 302          * @irq_uninstall:
 303          *
 304          * Optional callback used by drm_irq_uninstall() which is called before
 305          * the interrupt handler is unregistered. This should be used to disable
 306          * interrupt generation in the hardware.
 307          */
 308         void (*irq_uninstall) (struct drm_device *dev);
 309
 310         /**
 311          * @master_set:
 312          *
 313          * Called whenever the minor master is set. Only used by vmwgfx.
 314          */
 315         void (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
 316                            bool from_open);
 317         /**
 318          * @master_drop:
 319          *
 320          * Called whenever the minor master is dropped. Only used by vmwgfx.
 321          */
 322         void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
 323
 324         /**
 325          * @debugfs_init:
 326          *
 327          * Allows drivers to create driver-specific debugfs files.
 328          */
 329         void (*debugfs_init)(struct drm_minor *minor);
 330
 331         /**
 332          * @gem_create_object: constructor for gem objects
 333          *
 334          * Hook for allocating the GEM object struct, for use by the CMA and
 335          * SHMEM GEM helpers.
 336          */
 337         struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
 338                                                     size_t size);
 339
 340         /**
 341          * @prime_handle_to_fd:
 342          *
 343          * Main PRIME export function. Should be implemented with
 344          * drm_gem_prime_handle_to_fd() for GEM based drivers.
 345          *
 346          * For an in-depth discussion see :ref:`PRIME buffer sharing
 347          * documentation <prime_buffer_sharing>`.
 348          */
 349         int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
 350                                 uint32_t handle, uint32_t flags, int *prime_fd);
 351         /**
 352          * @prime_fd_to_handle:
 353          *
 354          * Main PRIME import function. Should be implemented with
 355          * drm_gem_prime_fd_to_handle() for GEM based drivers.
 356          *
 357          * For an in-depth discussion see :ref:`PRIME buffer sharing
 358          * documentation <prime_buffer_sharing>`.
 359          */
 360         int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
 361                                 int prime_fd, uint32_t *handle);
 362
 363         /**
 364          * @gem_prime_import:
 365          *
 366          * Import hook for GEM drivers.
 367          *
 368          * This defaults to drm_gem_prime_import() if not set.
 369          */
 370         struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
 371                                 struct dma_buf *dma_buf);
 372         /**
 373          * @gem_prime_import_sg_table:
 374          *
 375          * Optional hook used by the PRIME helper functions
 376          * drm_gem_prime_import() respectively drm_gem_prime_import_dev().
 377          */
 378         struct drm_gem_object *(*gem_prime_import_sg_table)(
 379                                 struct drm_device *dev,
 380                                 struct dma_buf_attachment *attach,
 381                                 struct sg_table *sgt);
 382         /**
 383          * @gem_prime_mmap:
 384          *
 385          * mmap hook for GEM drivers, used to implement dma-buf mmap in the
 386          * PRIME helpers.
 387          *
 388          * FIXME: There's way too much duplication going on here, and also moved
 389          * to &drm_gem_object_funcs.
 390          */
 391         int (*gem_prime_mmap)(struct drm_gem_object *obj,
 392                                 struct vm_area_struct *vma);
 393
 394         /**
 395          * @dumb_create:
 396          *
 397          * This creates a new dumb buffer in the driver's backing storage manager (GEM,
 398          * TTM or something else entirely) and returns the resulting buffer handle. This
 399          * handle can then be wrapped up into a framebuffer modeset object.
 400          *
 401          * Note that userspace is not allowed to use such objects for render
 402          * acceleration - drivers must create their own private ioctls for such a use
 403          * case.
 404          *
 405          * Width, height and depth are specified in the &drm_mode_create_dumb
 406          * argument. The callback needs to fill the handle, pitch and size for
 407          * the created buffer.
 408          *
 409          * Called by the user via ioctl.
 410          *
 411          * Returns:
 412          *
 413          * Zero on success, negative errno on failure.
 414          */
 415         int (*dumb_create)(struct drm_file *file_priv,
 416                            struct drm_device *dev,
 417                            struct drm_mode_create_dumb *args);
 418         /**
 419          * @dumb_map_offset:
 420          *
 421          * Allocate an offset in the drm device node's address space to be able to
 422          * memory map a dumb buffer.
 423          *
 424          * The default implementation is drm_gem_create_mmap_offset(). GEM based
 425          * drivers must not overwrite this.
 426          *
 427          * Called by the user via ioctl.
 428          *
 429          * Returns:
 430          *
 431          * Zero on success, negative errno on failure.
 432          */
 433         int (*dumb_map_offset)(struct drm_file *file_priv,
 434                                struct drm_device *dev, uint32_t handle,
 435                                uint64_t *offset);
 436         /**
 437          * @dumb_destroy:
 438          *
 439          * This destroys the userspace handle for the given dumb backing storage buffer.
 440          * Since buffer objects must be reference counted in the kernel a buffer object
 441          * won't be immediately freed if a framebuffer modeset object still uses it.
 442          *
 443          * Called by the user via ioctl.
 444          *
 445          * The default implementation is drm_gem_dumb_destroy(). GEM based drivers
 446          * must not overwrite this.
 447          *
 448          * Returns:
 449          *
 450          * Zero on success, negative errno on failure.
 451          */
 452         int (*dumb_destroy)(struct drm_file *file_priv,
 453                             struct drm_device *dev,
 454                             uint32_t handle);
 455
 456         /** @major: driver major number */
 457         int major;
 458         /** @minor: driver minor number */
 459         int minor;
 460         /** @patchlevel: driver patch level */
 461         int patchlevel;
 462         /** @name: driver name */
 463         char *name;
 464         /** @desc: driver description */
 465         char *desc;
 466         /** @date: driver date */
 467         char *date;
 468
 469         /**
 470          * @driver_features:
 471          * Driver features, see &enum drm_driver_feature. Drivers can disable
 472          * some features on a per-instance basis using
 473          * &drm_device.driver_features.
 474          */
 475         u32 driver_features;
 476
 477         /**
 478          * @ioctls:
 479          *
 480          * Array of driver-private IOCTL description entries. See the chapter on
 481          * :ref:`IOCTL support in the userland interfaces
 482          * chapter<drm_driver_ioctl>` for the full details.
 483          */
 484
 485         const struct drm_ioctl_desc *ioctls;
 486         /** @num_ioctls: Number of entries in @ioctls. */
 487         int num_ioctls;
 488
 489         /**
 490          * @fops:
 491          *
 492          * File operations for the DRM device node. See the discussion in
 493          * :ref:`file operations<drm_driver_fops>` for in-depth coverage and
 494          * some examples.
 495          */
 496         const struct file_operations *fops;
 497
 498 #ifdef CONFIG_DRM_LEGACY
 499         /* Everything below here is for legacy driver, never use! */
 500         /* private: */
 501
 502         /* List of devices hanging off this driver with stealth attach. */
 503         struct list_head legacy_dev_list;
 504         int (*firstopen) (struct drm_device *);
 505         void (*preclose) (struct drm_device *, struct drm_file *file_priv);
 506         int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
 507         int (*dma_quiescent) (struct drm_device *);
 508         int (*context_dtor) (struct drm_device *dev, int context);
 509         u32 (*get_vblank_counter)(struct drm_device *dev, unsigned int pipe);
 510         int (*enable_vblank)(struct drm_device *dev, unsigned int pipe);
 511         void (*disable_vblank)(struct drm_device *dev, unsigned int pipe);
 512         int dev_priv_size;
 513 #endif
 514 };
 515
 516 void *__devm_drm_dev_alloc(struct device *parent,
 517                            const struct drm_driver *driver,
 518                            size_t size, size_t offset);
 519
 520 /**
 521  * devm_drm_dev_alloc - Resource managed allocation of a &drm_device instance
 522  * @parent: Parent device object
 523  * @driver: DRM driver
 524  * @type: the type of the struct which contains struct &drm_device
 525  * @member: the name of the &drm_device within @type.
 526  *
 527  * This allocates and initialize a new DRM device. No device registration is done.
 528  * Call drm_dev_register() to advertice the device to user space and register it
 529  * with other core subsystems. This should be done last in the device
 530  * initialization sequence to make sure userspace can't access an inconsistent
 531  * state.
 532  *
 533  * The initial ref-count of the object is 1. Use drm_dev_get() and
 534  * drm_dev_put() to take and drop further ref-counts.
 535  *
 536  * It is recommended that drivers embed &struct drm_device into their own device
 537  * structure.
 538  *
 539  * Note that this manages the lifetime of the resulting &drm_device
 540  * automatically using devres. The DRM device initialized with this function is
 541  * automatically put on driver detach using drm_dev_put().
 542  *
 543  * RETURNS:
 544  * Pointer to new DRM device, or ERR_PTR on failure.
 545  */
 546 #define devm_drm_dev_alloc(parent, driver, type, member) \
 547         ((type *) __devm_drm_dev_alloc(parent, driver, sizeof(type), \
 548                                        offsetof(type, member)))
 549
 550 struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
 551                                  struct device *parent);
 552 int drm_dev_register(struct drm_device *dev, unsigned long flags);
 553 void drm_dev_unregister(struct drm_device *dev);
 554
 555 void drm_dev_get(struct drm_device *dev);
 556 void drm_dev_put(struct drm_device *dev);
 557 void drm_put_dev(struct drm_device *dev);
 558 bool drm_dev_enter(struct drm_device *dev, int *idx);
 559 void drm_dev_exit(int idx);
 560 void drm_dev_unplug(struct drm_device *dev);
 561
 562 /**
 563  * drm_dev_is_unplugged - is a DRM device unplugged
 564  * @dev: DRM device
 565  *
 566  * This function can be called to check whether a hotpluggable is unplugged.
 567  * Unplugging itself is singalled through drm_dev_unplug(). If a device is
 568  * unplugged, these two functions guarantee that any store before calling
 569  * drm_dev_unplug() is visible to callers of this function after it completes
 570  *
 571  * WARNING: This function fundamentally races against drm_dev_unplug(). It is
 572  * recommended that drivers instead use the underlying drm_dev_enter() and
 573  * drm_dev_exit() function pairs.
 574  */
 575 static inline bool drm_dev_is_unplugged(struct drm_device *dev)
 576 {
 577         int idx;
 578
 579         if (drm_dev_enter(dev, &idx)) {
 580                 drm_dev_exit(idx);
 581                 return false;
 582         }
 583
 584         return true;
 585 }
 586
 587 /**
 588  * drm_core_check_all_features - check driver feature flags mask
 589  * @dev: DRM device to check
 590  * @features: feature flag(s) mask
 591  *
 592  * This checks @dev for driver features, see &drm_driver.driver_features,
 593  * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
 594  *
 595  * Returns true if all features in the @features mask are supported, false
 596  * otherwise.
 597  */
 598 static inline bool drm_core_check_all_features(const struct drm_device *dev,
 599                                                u32 features)
 600 {
 601         u32 supported = dev->driver->driver_features & dev->driver_features;
 602
 603         return features && (supported & features) == features;
 604 }
 605
 606 /**
 607  * drm_core_check_feature - check driver feature flags
 608  * @dev: DRM device to check
 609  * @feature: feature flag
 610  *
 611  * This checks @dev for driver features, see &drm_driver.driver_features,
 612  * &drm_device.driver_features, and the various &enum drm_driver_feature flags.
 613  *
 614  * Returns true if the @feature is supported, false otherwise.
 615  */
 616 static inline bool drm_core_check_feature(const struct drm_device *dev,
 617                                           enum drm_driver_feature feature)
 618 {
 619         return drm_core_check_all_features(dev, feature);
 620 }
 621
 622 /**
 623  * drm_drv_uses_atomic_modeset - check if the driver implements
 624  * atomic_commit()
 625  * @dev: DRM device
 626  *
 627  * This check is useful if drivers do not have DRIVER_ATOMIC set but
 628  * have atomic modesetting internally implemented.
 629  */
 630 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev)
 631 {
 632         return drm_core_check_feature(dev, DRIVER_ATOMIC) ||
 633                 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL);
 634 }
 635
 636
 637 int drm_dev_set_unique(struct drm_device *dev, const char *name);
 638
 639
 640 #endif