1 /* 2 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 4 * Copyright (c) 2009-2010, Code Aurora Forum. 5 * Copyright 2016 Intel Corp. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the next 15 * paragraph) shall be included in all copies or substantial portions of the 16 * Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 24 * OTHER DEALINGS IN THE SOFTWARE. 25 */ 26 27 #ifndef _DRM_DRV_H_ 28 #define _DRM_DRV_H_ 29 30 #include <linux/list.h> 31 #include <linux/irqreturn.h> 32 33 #include <drm/drm_device.h> 34 35 struct drm_file; 36 struct drm_gem_object; 37 struct drm_master; 38 struct drm_minor; 39 struct dma_buf_attachment; 40 struct drm_display_mode; 41 struct drm_mode_create_dumb; 42 struct drm_printer; 43 44 /** 45 * enum drm_driver_feature - feature flags 46 * 47 * See &drm_driver.driver_features, drm_device.driver_features and 48 * drm_core_check_feature(). 49 */ 50 enum drm_driver_feature { 51 /** 52 * @DRIVER_GEM: 53 * 54 * Driver use the GEM memory manager. This should be set for all modern 55 * drivers. 56 */ 57 DRIVER_GEM = BIT(0), 58 /** 59 * @DRIVER_MODESET: 60 * 61 * Driver supports mode setting interfaces (KMS). 62 */ 63 DRIVER_MODESET = BIT(1), 64 /** 65 * @DRIVER_RENDER: 66 * 67 * Driver supports dedicated render nodes. See also the :ref:`section on 68 * render nodes <drm_render_node>` for details. 69 */ 70 DRIVER_RENDER = BIT(3), 71 /** 72 * @DRIVER_ATOMIC: 73 * 74 * Driver supports the full atomic modesetting userspace API. Drivers 75 * which only use atomic internally, but do not the support the full 76 * userspace API (e.g. not all properties converted to atomic, or 77 * multi-plane updates are not guaranteed to be tear-free) should not 78 * set this flag. 79 */ 80 DRIVER_ATOMIC = BIT(4), 81 /** 82 * @DRIVER_SYNCOBJ: 83 * 84 * Driver supports &drm_syncobj for explicit synchronization of command 85 * submission. 86 */ 87 DRIVER_SYNCOBJ = BIT(5), 88 /** 89 * @DRIVER_SYNCOBJ_TIMELINE: 90 * 91 * Driver supports the timeline flavor of &drm_syncobj for explicit 92 * synchronization of command submission. 93 */ 94 DRIVER_SYNCOBJ_TIMELINE = BIT(6), 95 96 /* IMPORTANT: Below are all the legacy flags, add new ones above. */ 97 98 /** 99 * @DRIVER_USE_AGP: 100 * 101 * Set up DRM AGP support, see drm_agp_init(), the DRM core will manage 102 * AGP resources. New drivers don't need this. 103 */ 104 DRIVER_USE_AGP = BIT(25), 105 /** 106 * @DRIVER_LEGACY: 107 * 108 * Denote a legacy driver using shadow attach. Do not use. 109 */ 110 DRIVER_LEGACY = BIT(26), 111 /** 112 * @DRIVER_PCI_DMA: 113 * 114 * Driver is capable of PCI DMA, mapping of PCI DMA buffers to userspace 115 * will be enabled. Only for legacy drivers. Do not use. 116 */ 117 DRIVER_PCI_DMA = BIT(27), 118 /** 119 * @DRIVER_SG: 120 * 121 * Driver can perform scatter/gather DMA, allocation and mapping of 122 * scatter/gather buffers will be enabled. Only for legacy drivers. Do 123 * not use. 124 */ 125 DRIVER_SG = BIT(28), 126 127 /** 128 * @DRIVER_HAVE_DMA: 129 * 130 * Driver supports DMA, the userspace DMA API will be supported. Only 131 * for legacy drivers. Do not use. 132 */ 133 DRIVER_HAVE_DMA = BIT(29), 134 /** 135 * @DRIVER_HAVE_IRQ: 136 * 137 * Legacy irq support. Only for legacy drivers. Do not use. 138 * 139 * New drivers can either use the drm_irq_install() and 140 * drm_irq_uninstall() helper functions, or roll their own irq support 141 * code by calling request_irq() directly. 142 */ 143 DRIVER_HAVE_IRQ = BIT(30), 144 /** 145 * @DRIVER_KMS_LEGACY_CONTEXT: 146 * 147 * Used only by nouveau for backwards compatibility with existing 148 * userspace. Do not use. 149 */ 150 DRIVER_KMS_LEGACY_CONTEXT = BIT(31), 151 }; 152 153 /** 154 * struct drm_driver - DRM driver structure 155 * 156 * This structure represent the common code for a family of cards. There will be 157 * one &struct drm_device for each card present in this family. It contains lots 158 * of vfunc entries, and a pile of those probably should be moved to more 159 * appropriate places like &drm_mode_config_funcs or into a new operations 160 * structure for GEM drivers. 161 */ 162 struct drm_driver { 163 /** 164 * @load: 165 * 166 * Backward-compatible driver callback to complete 167 * initialization steps after the driver is registered. For 168 * this reason, may suffer from race conditions and its use is 169 * deprecated for new drivers. It is therefore only supported 170 * for existing drivers not yet converted to the new scheme. 171 * See drm_dev_init() and drm_dev_register() for proper and 172 * race-free way to set up a &struct drm_device. 173 * 174 * This is deprecated, do not use! 175 * 176 * Returns: 177 * 178 * Zero on success, non-zero value on failure. 179 */ 180 int (*load) (struct drm_device *, unsigned long flags); 181 182 /** 183 * @open: 184 * 185 * Driver callback when a new &struct drm_file is opened. Useful for 186 * setting up driver-private data structures like buffer allocators, 187 * execution contexts or similar things. Such driver-private resources 188 * must be released again in @postclose. 189 * 190 * Since the display/modeset side of DRM can only be owned by exactly 191 * one &struct drm_file (see &drm_file.is_master and &drm_device.master) 192 * there should never be a need to set up any modeset related resources 193 * in this callback. Doing so would be a driver design bug. 194 * 195 * Returns: 196 * 197 * 0 on success, a negative error code on failure, which will be 198 * promoted to userspace as the result of the open() system call. 199 */ 200 int (*open) (struct drm_device *, struct drm_file *); 201 202 /** 203 * @postclose: 204 * 205 * One of the driver callbacks when a new &struct drm_file is closed. 206 * Useful for tearing down driver-private data structures allocated in 207 * @open like buffer allocators, execution contexts or similar things. 208 * 209 * Since the display/modeset side of DRM can only be owned by exactly 210 * one &struct drm_file (see &drm_file.is_master and &drm_device.master) 211 * there should never be a need to tear down any modeset related 212 * resources in this callback. Doing so would be a driver design bug. 213 */ 214 void (*postclose) (struct drm_device *, struct drm_file *); 215 216 /** 217 * @lastclose: 218 * 219 * Called when the last &struct drm_file has been closed and there's 220 * currently no userspace client for the &struct drm_device. 221 * 222 * Modern drivers should only use this to force-restore the fbdev 223 * framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked(). 224 * Anything else would indicate there's something seriously wrong. 225 * Modern drivers can also use this to execute delayed power switching 226 * state changes, e.g. in conjunction with the :ref:`vga_switcheroo` 227 * infrastructure. 228 * 229 * This is called after @postclose hook has been called. 230 * 231 * NOTE: 232 * 233 * All legacy drivers use this callback to de-initialize the hardware. 234 * This is purely because of the shadow-attach model, where the DRM 235 * kernel driver does not really own the hardware. Instead ownershipe is 236 * handled with the help of userspace through an inheritedly racy dance 237 * to set/unset the VT into raw mode. 238 * 239 * Legacy drivers initialize the hardware in the @firstopen callback, 240 * which isn't even called for modern drivers. 241 */ 242 void (*lastclose) (struct drm_device *); 243 244 /** 245 * @unload: 246 * 247 * Reverse the effects of the driver load callback. Ideally, 248 * the clean up performed by the driver should happen in the 249 * reverse order of the initialization. Similarly to the load 250 * hook, this handler is deprecated and its usage should be 251 * dropped in favor of an open-coded teardown function at the 252 * driver layer. See drm_dev_unregister() and drm_dev_put() 253 * for the proper way to remove a &struct drm_device. 254 * 255 * The unload() hook is called right after unregistering 256 * the device. 257 * 258 */ 259 void (*unload) (struct drm_device *); 260 261 /** 262 * @release: 263 * 264 * Optional callback for destroying device data after the final 265 * reference is released, i.e. the device is being destroyed. Drivers 266 * using this callback are responsible for calling drm_dev_fini() 267 * to finalize the device and then freeing the struct themselves. 268 */ 269 void (*release) (struct drm_device *); 270 271 /** 272 * @get_vblank_counter: 273 * 274 * Driver callback for fetching a raw hardware vblank counter for the 275 * CRTC specified with the pipe argument. If a device doesn't have a 276 * hardware counter, the driver can simply leave the hook as NULL. 277 * The DRM core will account for missed vblank events while interrupts 278 * where disabled based on system timestamps. 279 * 280 * Wraparound handling and loss of events due to modesetting is dealt 281 * with in the DRM core code, as long as drivers call 282 * drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or 283 * enabling a CRTC. 284 * 285 * This is deprecated and should not be used by new drivers. 286 * Use &drm_crtc_funcs.get_vblank_counter instead. 287 * 288 * Returns: 289 * 290 * Raw vblank counter value. 291 */ 292 u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe); 293 294 /** 295 * @enable_vblank: 296 * 297 * Enable vblank interrupts for the CRTC specified with the pipe 298 * argument. 299 * 300 * This is deprecated and should not be used by new drivers. 301 * Use &drm_crtc_funcs.enable_vblank instead. 302 * 303 * Returns: 304 * 305 * Zero on success, appropriate errno if the given @crtc's vblank 306 * interrupt cannot be enabled. 307 */ 308 int (*enable_vblank) (struct drm_device *dev, unsigned int pipe); 309 310 /** 311 * @disable_vblank: 312 * 313 * Disable vblank interrupts for the CRTC specified with the pipe 314 * argument. 315 * 316 * This is deprecated and should not be used by new drivers. 317 * Use &drm_crtc_funcs.disable_vblank instead. 318 */ 319 void (*disable_vblank) (struct drm_device *dev, unsigned int pipe); 320 321 /** 322 * @get_scanout_position: 323 * 324 * Called by vblank timestamping code. 325 * 326 * Returns the current display scanout position from a crtc, and an 327 * optional accurate ktime_get() timestamp of when position was 328 * measured. Note that this is a helper callback which is only used if a 329 * driver uses drm_calc_vbltimestamp_from_scanoutpos() for the 330 * @get_vblank_timestamp callback. 331 * 332 * Parameters: 333 * 334 * dev: 335 * DRM device. 336 * pipe: 337 * Id of the crtc to query. 338 * in_vblank_irq: 339 * True when called from drm_crtc_handle_vblank(). Some drivers 340 * need to apply some workarounds for gpu-specific vblank irq quirks 341 * if flag is set. 342 * vpos: 343 * Target location for current vertical scanout position. 344 * hpos: 345 * Target location for current horizontal scanout position. 346 * stime: 347 * Target location for timestamp taken immediately before 348 * scanout position query. Can be NULL to skip timestamp. 349 * etime: 350 * Target location for timestamp taken immediately after 351 * scanout position query. Can be NULL to skip timestamp. 352 * mode: 353 * Current display timings. 354 * 355 * Returns vpos as a positive number while in active scanout area. 356 * Returns vpos as a negative number inside vblank, counting the number 357 * of scanlines to go until end of vblank, e.g., -1 means "one scanline 358 * until start of active scanout / end of vblank." 359 * 360 * Returns: 361 * 362 * True on success, false if a reliable scanout position counter could 363 * not be read out. 364 * 365 * FIXME: 366 * 367 * Since this is a helper to implement @get_vblank_timestamp, we should 368 * move it to &struct drm_crtc_helper_funcs, like all the other 369 * helper-internal hooks. 370 */ 371 bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe, 372 bool in_vblank_irq, int *vpos, int *hpos, 373 ktime_t *stime, ktime_t *etime, 374 const struct drm_display_mode *mode); 375 376 /** 377 * @get_vblank_timestamp: 378 * 379 * Called by drm_get_last_vbltimestamp(). Should return a precise 380 * timestamp when the most recent VBLANK interval ended or will end. 381 * 382 * Specifically, the timestamp in @vblank_time should correspond as 383 * closely as possible to the time when the first video scanline of 384 * the video frame after the end of VBLANK will start scanning out, 385 * the time immediately after end of the VBLANK interval. If the 386 * @crtc is currently inside VBLANK, this will be a time in the future. 387 * If the @crtc is currently scanning out a frame, this will be the 388 * past start time of the current scanout. This is meant to adhere 389 * to the OpenML OML_sync_control extension specification. 390 * 391 * Paramters: 392 * 393 * dev: 394 * dev DRM device handle. 395 * pipe: 396 * crtc for which timestamp should be returned. 397 * max_error: 398 * Maximum allowable timestamp error in nanoseconds. 399 * Implementation should strive to provide timestamp 400 * with an error of at most max_error nanoseconds. 401 * Returns true upper bound on error for timestamp. 402 * vblank_time: 403 * Target location for returned vblank timestamp. 404 * in_vblank_irq: 405 * True when called from drm_crtc_handle_vblank(). Some drivers 406 * need to apply some workarounds for gpu-specific vblank irq quirks 407 * if flag is set. 408 * 409 * Returns: 410 * 411 * True on success, false on failure, which means the core should 412 * fallback to a simple timestamp taken in drm_crtc_handle_vblank(). 413 * 414 * FIXME: 415 * 416 * We should move this hook to &struct drm_crtc_funcs like all the other 417 * vblank hooks. 418 */ 419 bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe, 420 int *max_error, 421 ktime_t *vblank_time, 422 bool in_vblank_irq); 423 424 /** 425 * @irq_handler: 426 * 427 * Interrupt handler called when using drm_irq_install(). Not used by 428 * drivers which implement their own interrupt handling. 429 */ 430 irqreturn_t(*irq_handler) (int irq, void *arg); 431 432 /** 433 * @irq_preinstall: 434 * 435 * Optional callback used by drm_irq_install() which is called before 436 * the interrupt handler is registered. This should be used to clear out 437 * any pending interrupts (from e.g. firmware based drives) and reset 438 * the interrupt handling registers. 439 */ 440 void (*irq_preinstall) (struct drm_device *dev); 441 442 /** 443 * @irq_postinstall: 444 * 445 * Optional callback used by drm_irq_install() which is called after 446 * the interrupt handler is registered. This should be used to enable 447 * interrupt generation in the hardware. 448 */ 449 int (*irq_postinstall) (struct drm_device *dev); 450 451 /** 452 * @irq_uninstall: 453 * 454 * Optional callback used by drm_irq_uninstall() which is called before 455 * the interrupt handler is unregistered. This should be used to disable 456 * interrupt generation in the hardware. 457 */ 458 void (*irq_uninstall) (struct drm_device *dev); 459 460 /** 461 * @master_create: 462 * 463 * Called whenever a new master is created. Only used by vmwgfx. 464 */ 465 int (*master_create)(struct drm_device *dev, struct drm_master *master); 466 467 /** 468 * @master_destroy: 469 * 470 * Called whenever a master is destroyed. Only used by vmwgfx. 471 */ 472 void (*master_destroy)(struct drm_device *dev, struct drm_master *master); 473 474 /** 475 * @master_set: 476 * 477 * Called whenever the minor master is set. Only used by vmwgfx. 478 */ 479 int (*master_set)(struct drm_device *dev, struct drm_file *file_priv, 480 bool from_open); 481 /** 482 * @master_drop: 483 * 484 * Called whenever the minor master is dropped. Only used by vmwgfx. 485 */ 486 void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv); 487 488 /** 489 * @debugfs_init: 490 * 491 * Allows drivers to create driver-specific debugfs files. 492 */ 493 int (*debugfs_init)(struct drm_minor *minor); 494 495 /** 496 * @gem_free_object: deconstructor for drm_gem_objects 497 * 498 * This is deprecated and should not be used by new drivers. Use 499 * &drm_gem_object_funcs.free instead. 500 */ 501 void (*gem_free_object) (struct drm_gem_object *obj); 502 503 /** 504 * @gem_free_object_unlocked: deconstructor for drm_gem_objects 505 * 506 * This is deprecated and should not be used by new drivers. Use 507 * &drm_gem_object_funcs.free instead. 508 * Compared to @gem_free_object this is not encumbered with 509 * &drm_device.struct_mutex legacy locking schemes. 510 */ 511 void (*gem_free_object_unlocked) (struct drm_gem_object *obj); 512 513 /** 514 * @gem_open_object: 515 * 516 * This callback is deprecated in favour of &drm_gem_object_funcs.open. 517 * 518 * Driver hook called upon gem handle creation 519 */ 520 int (*gem_open_object) (struct drm_gem_object *, struct drm_file *); 521 522 /** 523 * @gem_close_object: 524 * 525 * This callback is deprecated in favour of &drm_gem_object_funcs.close. 526 * 527 * Driver hook called upon gem handle release 528 */ 529 void (*gem_close_object) (struct drm_gem_object *, struct drm_file *); 530 531 /** 532 * @gem_print_info: 533 * 534 * This callback is deprecated in favour of 535 * &drm_gem_object_funcs.print_info. 536 * 537 * If driver subclasses struct &drm_gem_object, it can implement this 538 * optional hook for printing additional driver specific info. 539 * 540 * drm_printf_indent() should be used in the callback passing it the 541 * indent argument. 542 * 543 * This callback is called from drm_gem_print_info(). 544 */ 545 void (*gem_print_info)(struct drm_printer *p, unsigned int indent, 546 const struct drm_gem_object *obj); 547 548 /** 549 * @gem_create_object: constructor for gem objects 550 * 551 * Hook for allocating the GEM object struct, for use by the CMA and 552 * SHMEM GEM helpers. 553 */ 554 struct drm_gem_object *(*gem_create_object)(struct drm_device *dev, 555 size_t size); 556 /** 557 * @prime_handle_to_fd: 558 * 559 * Main PRIME export function. Should be implemented with 560 * drm_gem_prime_handle_to_fd() for GEM based drivers. 561 * 562 * For an in-depth discussion see :ref:`PRIME buffer sharing 563 * documentation <prime_buffer_sharing>`. 564 */ 565 int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv, 566 uint32_t handle, uint32_t flags, int *prime_fd); 567 /** 568 * @prime_fd_to_handle: 569 * 570 * Main PRIME import function. Should be implemented with 571 * drm_gem_prime_fd_to_handle() for GEM based drivers. 572 * 573 * For an in-depth discussion see :ref:`PRIME buffer sharing 574 * documentation <prime_buffer_sharing>`. 575 */ 576 int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv, 577 int prime_fd, uint32_t *handle); 578 /** 579 * @gem_prime_export: 580 * 581 * Export hook for GEM drivers. Deprecated in favour of 582 * &drm_gem_object_funcs.export. 583 */ 584 struct dma_buf * (*gem_prime_export)(struct drm_gem_object *obj, 585 int flags); 586 /** 587 * @gem_prime_import: 588 * 589 * Import hook for GEM drivers. 590 * 591 * This defaults to drm_gem_prime_import() if not set. 592 */ 593 struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev, 594 struct dma_buf *dma_buf); 595 596 /** 597 * @gem_prime_pin: 598 * 599 * Deprecated hook in favour of &drm_gem_object_funcs.pin. 600 */ 601 int (*gem_prime_pin)(struct drm_gem_object *obj); 602 603 /** 604 * @gem_prime_unpin: 605 * 606 * Deprecated hook in favour of &drm_gem_object_funcs.unpin. 607 */ 608 void (*gem_prime_unpin)(struct drm_gem_object *obj); 609 610 611 /** 612 * @gem_prime_get_sg_table: 613 * 614 * Deprecated hook in favour of &drm_gem_object_funcs.get_sg_table. 615 */ 616 struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj); 617 618 /** 619 * @gem_prime_import_sg_table: 620 * 621 * Optional hook used by the PRIME helper functions 622 * drm_gem_prime_import() respectively drm_gem_prime_import_dev(). 623 */ 624 struct drm_gem_object *(*gem_prime_import_sg_table)( 625 struct drm_device *dev, 626 struct dma_buf_attachment *attach, 627 struct sg_table *sgt); 628 /** 629 * @gem_prime_vmap: 630 * 631 * Deprecated vmap hook for GEM drivers. Please use 632 * &drm_gem_object_funcs.vmap instead. 633 */ 634 void *(*gem_prime_vmap)(struct drm_gem_object *obj); 635 636 /** 637 * @gem_prime_vunmap: 638 * 639 * Deprecated vunmap hook for GEM drivers. Please use 640 * &drm_gem_object_funcs.vunmap instead. 641 */ 642 void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr); 643 644 /** 645 * @gem_prime_mmap: 646 * 647 * mmap hook for GEM drivers, used to implement dma-buf mmap in the 648 * PRIME helpers. 649 * 650 * FIXME: There's way too much duplication going on here, and also moved 651 * to &drm_gem_object_funcs. 652 */ 653 int (*gem_prime_mmap)(struct drm_gem_object *obj, 654 struct vm_area_struct *vma); 655 656 /** 657 * @dumb_create: 658 * 659 * This creates a new dumb buffer in the driver's backing storage manager (GEM, 660 * TTM or something else entirely) and returns the resulting buffer handle. This 661 * handle can then be wrapped up into a framebuffer modeset object. 662 * 663 * Note that userspace is not allowed to use such objects for render 664 * acceleration - drivers must create their own private ioctls for such a use 665 * case. 666 * 667 * Width, height and depth are specified in the &drm_mode_create_dumb 668 * argument. The callback needs to fill the handle, pitch and size for 669 * the created buffer. 670 * 671 * Called by the user via ioctl. 672 * 673 * Returns: 674 * 675 * Zero on success, negative errno on failure. 676 */ 677 int (*dumb_create)(struct drm_file *file_priv, 678 struct drm_device *dev, 679 struct drm_mode_create_dumb *args); 680 /** 681 * @dumb_map_offset: 682 * 683 * Allocate an offset in the drm device node's address space to be able to 684 * memory map a dumb buffer. 685 * 686 * The default implementation is drm_gem_create_mmap_offset(). GEM based 687 * drivers must not overwrite this. 688 * 689 * Called by the user via ioctl. 690 * 691 * Returns: 692 * 693 * Zero on success, negative errno on failure. 694 */ 695 int (*dumb_map_offset)(struct drm_file *file_priv, 696 struct drm_device *dev, uint32_t handle, 697 uint64_t *offset); 698 /** 699 * @dumb_destroy: 700 * 701 * This destroys the userspace handle for the given dumb backing storage buffer. 702 * Since buffer objects must be reference counted in the kernel a buffer object 703 * won't be immediately freed if a framebuffer modeset object still uses it. 704 * 705 * Called by the user via ioctl. 706 * 707 * The default implementation is drm_gem_dumb_destroy(). GEM based drivers 708 * must not overwrite this. 709 * 710 * Returns: 711 * 712 * Zero on success, negative errno on failure. 713 */ 714 int (*dumb_destroy)(struct drm_file *file_priv, 715 struct drm_device *dev, 716 uint32_t handle); 717 718 /** 719 * @gem_vm_ops: Driver private ops for this object 720 * 721 * For GEM drivers this is deprecated in favour of 722 * &drm_gem_object_funcs.vm_ops. 723 */ 724 const struct vm_operations_struct *gem_vm_ops; 725 726 /** @major: driver major number */ 727 int major; 728 /** @minor: driver minor number */ 729 int minor; 730 /** @patchlevel: driver patch level */ 731 int patchlevel; 732 /** @name: driver name */ 733 char *name; 734 /** @desc: driver description */ 735 char *desc; 736 /** @date: driver date */ 737 char *date; 738 739 /** 740 * @driver_features: 741 * Driver features, see &enum drm_driver_feature. Drivers can disable 742 * some features on a per-instance basis using 743 * &drm_device.driver_features. 744 */ 745 u32 driver_features; 746 747 /** 748 * @ioctls: 749 * 750 * Array of driver-private IOCTL description entries. See the chapter on 751 * :ref:`IOCTL support in the userland interfaces 752 * chapter<drm_driver_ioctl>` for the full details. 753 */ 754 755 const struct drm_ioctl_desc *ioctls; 756 /** @num_ioctls: Number of entries in @ioctls. */ 757 int num_ioctls; 758 759 /** 760 * @fops: 761 * 762 * File operations for the DRM device node. See the discussion in 763 * :ref:`file operations<drm_driver_fops>` for in-depth coverage and 764 * some examples. 765 */ 766 const struct file_operations *fops; 767 768 /* Everything below here is for legacy driver, never use! */ 769 /* private: */ 770 771 /* List of devices hanging off this driver with stealth attach. */ 772 struct list_head legacy_dev_list; 773 int (*firstopen) (struct drm_device *); 774 void (*preclose) (struct drm_device *, struct drm_file *file_priv); 775 int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv); 776 int (*dma_quiescent) (struct drm_device *); 777 int (*context_dtor) (struct drm_device *dev, int context); 778 int dev_priv_size; 779 }; 780 781 extern unsigned int drm_debug; 782 783 int drm_dev_init(struct drm_device *dev, 784 struct drm_driver *driver, 785 struct device *parent); 786 int devm_drm_dev_init(struct device *parent, 787 struct drm_device *dev, 788 struct drm_driver *driver); 789 void drm_dev_fini(struct drm_device *dev); 790 791 struct drm_device *drm_dev_alloc(struct drm_driver *driver, 792 struct device *parent); 793 int drm_dev_register(struct drm_device *dev, unsigned long flags); 794 void drm_dev_unregister(struct drm_device *dev); 795 796 void drm_dev_get(struct drm_device *dev); 797 void drm_dev_put(struct drm_device *dev); 798 void drm_put_dev(struct drm_device *dev); 799 bool drm_dev_enter(struct drm_device *dev, int *idx); 800 void drm_dev_exit(int idx); 801 void drm_dev_unplug(struct drm_device *dev); 802 803 /** 804 * drm_dev_is_unplugged - is a DRM device unplugged 805 * @dev: DRM device 806 * 807 * This function can be called to check whether a hotpluggable is unplugged. 808 * Unplugging itself is singalled through drm_dev_unplug(). If a device is 809 * unplugged, these two functions guarantee that any store before calling 810 * drm_dev_unplug() is visible to callers of this function after it completes 811 * 812 * WARNING: This function fundamentally races against drm_dev_unplug(). It is 813 * recommended that drivers instead use the underlying drm_dev_enter() and 814 * drm_dev_exit() function pairs. 815 */ 816 static inline bool drm_dev_is_unplugged(struct drm_device *dev) 817 { 818 int idx; 819 820 if (drm_dev_enter(dev, &idx)) { 821 drm_dev_exit(idx); 822 return false; 823 } 824 825 return true; 826 } 827 828 /** 829 * drm_core_check_feature - check driver feature flags 830 * @dev: DRM device to check 831 * @feature: feature flag 832 * 833 * This checks @dev for driver features, see &drm_driver.driver_features, 834 * &drm_device.driver_features, and the various &enum drm_driver_feature flags. 835 * 836 * Returns true if the @feature is supported, false otherwise. 837 */ 838 static inline bool drm_core_check_feature(const struct drm_device *dev, u32 feature) 839 { 840 return dev->driver->driver_features & dev->driver_features & feature; 841 } 842 843 /** 844 * drm_drv_uses_atomic_modeset - check if the driver implements 845 * atomic_commit() 846 * @dev: DRM device 847 * 848 * This check is useful if drivers do not have DRIVER_ATOMIC set but 849 * have atomic modesetting internally implemented. 850 */ 851 static inline bool drm_drv_uses_atomic_modeset(struct drm_device *dev) 852 { 853 return drm_core_check_feature(dev, DRIVER_ATOMIC) || 854 (dev->mode_config.funcs && dev->mode_config.funcs->atomic_commit != NULL); 855 } 856 857 858 int drm_dev_set_unique(struct drm_device *dev, const char *name); 859 860 861 #endif 862