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