1 #ifndef __DRM_GEM_H__ 2 #define __DRM_GEM_H__ 3 4 /* 5 * GEM Graphics Execution Manager Driver Interfaces 6 * 7 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. 8 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 9 * Copyright (c) 2009-2010, Code Aurora Forum. 10 * All rights reserved. 11 * Copyright © 2014 Intel Corporation 12 * Daniel Vetter <daniel.vetter@ffwll.ch> 13 * 14 * Author: Rickard E. (Rik) Faith <faith@valinux.com> 15 * Author: Gareth Hughes <gareth@valinux.com> 16 * 17 * Permission is hereby granted, free of charge, to any person obtaining a 18 * copy of this software and associated documentation files (the "Software"), 19 * to deal in the Software without restriction, including without limitation 20 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 21 * and/or sell copies of the Software, and to permit persons to whom the 22 * Software is furnished to do so, subject to the following conditions: 23 * 24 * The above copyright notice and this permission notice (including the next 25 * paragraph) shall be included in all copies or substantial portions of the 26 * Software. 27 * 28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 34 * OTHER DEALINGS IN THE SOFTWARE. 35 */ 36 37 #include <linux/kref.h> 38 #include <linux/dma-resv.h> 39 #include <linux/list.h> 40 #include <linux/mutex.h> 41 42 #include <drm/drm_vma_manager.h> 43 44 struct iosys_map; 45 struct drm_gem_object; 46 47 /** 48 * enum drm_gem_object_status - bitmask of object state for fdinfo reporting 49 * @DRM_GEM_OBJECT_RESIDENT: object is resident in memory (ie. not unpinned) 50 * @DRM_GEM_OBJECT_PURGEABLE: object marked as purgeable by userspace 51 * 52 * Bitmask of status used for fdinfo memory stats, see &drm_gem_object_funcs.status 53 * and drm_show_fdinfo(). Note that an object can DRM_GEM_OBJECT_PURGEABLE if 54 * it still active or not resident, in which case drm_show_fdinfo() will not 55 * account for it as purgeable. So drivers do not need to check if the buffer 56 * is idle and resident to return this bit. (Ie. userspace can mark a buffer 57 * as purgeable even while it is still busy on the GPU.. it does not _actually_ 58 * become puregeable until it becomes idle. The status gem object func does 59 * not need to consider this.) 60 */ 61 enum drm_gem_object_status { 62 DRM_GEM_OBJECT_RESIDENT = BIT(0), 63 DRM_GEM_OBJECT_PURGEABLE = BIT(1), 64 }; 65 66 /** 67 * struct drm_gem_object_funcs - GEM object functions 68 */ 69 struct drm_gem_object_funcs { 70 /** 71 * @free: 72 * 73 * Deconstructor for drm_gem_objects. 74 * 75 * This callback is mandatory. 76 */ 77 void (*free)(struct drm_gem_object *obj); 78 79 /** 80 * @open: 81 * 82 * Called upon GEM handle creation. 83 * 84 * This callback is optional. 85 */ 86 int (*open)(struct drm_gem_object *obj, struct drm_file *file); 87 88 /** 89 * @close: 90 * 91 * Called upon GEM handle release. 92 * 93 * This callback is optional. 94 */ 95 void (*close)(struct drm_gem_object *obj, struct drm_file *file); 96 97 /** 98 * @print_info: 99 * 100 * If driver subclasses struct &drm_gem_object, it can implement this 101 * optional hook for printing additional driver specific info. 102 * 103 * drm_printf_indent() should be used in the callback passing it the 104 * indent argument. 105 * 106 * This callback is called from drm_gem_print_info(). 107 * 108 * This callback is optional. 109 */ 110 void (*print_info)(struct drm_printer *p, unsigned int indent, 111 const struct drm_gem_object *obj); 112 113 /** 114 * @export: 115 * 116 * Export backing buffer as a &dma_buf. 117 * If this is not set drm_gem_prime_export() is used. 118 * 119 * This callback is optional. 120 */ 121 struct dma_buf *(*export)(struct drm_gem_object *obj, int flags); 122 123 /** 124 * @pin: 125 * 126 * Pin backing buffer in memory. Used by the drm_gem_map_attach() helper. 127 * 128 * This callback is optional. 129 */ 130 int (*pin)(struct drm_gem_object *obj); 131 132 /** 133 * @unpin: 134 * 135 * Unpin backing buffer. Used by the drm_gem_map_detach() helper. 136 * 137 * This callback is optional. 138 */ 139 void (*unpin)(struct drm_gem_object *obj); 140 141 /** 142 * @get_sg_table: 143 * 144 * Returns a Scatter-Gather table representation of the buffer. 145 * Used when exporting a buffer by the drm_gem_map_dma_buf() helper. 146 * Releasing is done by calling dma_unmap_sg_attrs() and sg_free_table() 147 * in drm_gem_unmap_buf(), therefore these helpers and this callback 148 * here cannot be used for sg tables pointing at driver private memory 149 * ranges. 150 * 151 * See also drm_prime_pages_to_sg(). 152 */ 153 struct sg_table *(*get_sg_table)(struct drm_gem_object *obj); 154 155 /** 156 * @vmap: 157 * 158 * Returns a virtual address for the buffer. Used by the 159 * drm_gem_dmabuf_vmap() helper. 160 * 161 * This callback is optional. 162 */ 163 int (*vmap)(struct drm_gem_object *obj, struct iosys_map *map); 164 165 /** 166 * @vunmap: 167 * 168 * Releases the address previously returned by @vmap. Used by the 169 * drm_gem_dmabuf_vunmap() helper. 170 * 171 * This callback is optional. 172 */ 173 void (*vunmap)(struct drm_gem_object *obj, struct iosys_map *map); 174 175 /** 176 * @mmap: 177 * 178 * Handle mmap() of the gem object, setup vma accordingly. 179 * 180 * This callback is optional. 181 * 182 * The callback is used by both drm_gem_mmap_obj() and 183 * drm_gem_prime_mmap(). When @mmap is present @vm_ops is not 184 * used, the @mmap callback must set vma->vm_ops instead. 185 */ 186 int (*mmap)(struct drm_gem_object *obj, struct vm_area_struct *vma); 187 188 /** 189 * @evict: 190 * 191 * Evicts gem object out from memory. Used by the drm_gem_object_evict() 192 * helper. Returns 0 on success, -errno otherwise. 193 * 194 * This callback is optional. 195 */ 196 int (*evict)(struct drm_gem_object *obj); 197 198 /** 199 * @status: 200 * 201 * The optional status callback can return additional object state 202 * which determines which stats the object is counted against. The 203 * callback is called under table_lock. Racing against object status 204 * change is "harmless", and the callback can expect to not race 205 * against object destruction. 206 * 207 * Called by drm_show_memory_stats(). 208 */ 209 enum drm_gem_object_status (*status)(struct drm_gem_object *obj); 210 211 /** 212 * @rss: 213 * 214 * Return resident size of the object in physical memory. 215 * 216 * Called by drm_show_memory_stats(). 217 */ 218 size_t (*rss)(struct drm_gem_object *obj); 219 220 /** 221 * @vm_ops: 222 * 223 * Virtual memory operations used with mmap. 224 * 225 * This is optional but necessary for mmap support. 226 */ 227 const struct vm_operations_struct *vm_ops; 228 }; 229 230 /** 231 * struct drm_gem_lru - A simple LRU helper 232 * 233 * A helper for tracking GEM objects in a given state, to aid in 234 * driver's shrinker implementation. Tracks the count of pages 235 * for lockless &shrinker.count_objects, and provides 236 * &drm_gem_lru_scan for driver's &shrinker.scan_objects 237 * implementation. 238 */ 239 struct drm_gem_lru { 240 /** 241 * @lock: 242 * 243 * Lock protecting movement of GEM objects between LRUs. All 244 * LRUs that the object can move between should be protected 245 * by the same lock. 246 */ 247 struct mutex *lock; 248 249 /** 250 * @count: 251 * 252 * The total number of backing pages of the GEM objects in 253 * this LRU. 254 */ 255 long count; 256 257 /** 258 * @list: 259 * 260 * The LRU list. 261 */ 262 struct list_head list; 263 }; 264 265 /** 266 * struct drm_gem_object - GEM buffer object 267 * 268 * This structure defines the generic parts for GEM buffer objects, which are 269 * mostly around handling mmap and userspace handles. 270 * 271 * Buffer objects are often abbreviated to BO. 272 */ 273 struct drm_gem_object { 274 /** 275 * @refcount: 276 * 277 * Reference count of this object 278 * 279 * Please use drm_gem_object_get() to acquire and drm_gem_object_put_locked() 280 * or drm_gem_object_put() to release a reference to a GEM 281 * buffer object. 282 */ 283 struct kref refcount; 284 285 /** 286 * @handle_count: 287 * 288 * This is the GEM file_priv handle count of this object. 289 * 290 * Each handle also holds a reference. Note that when the handle_count 291 * drops to 0 any global names (e.g. the id in the flink namespace) will 292 * be cleared. 293 * 294 * Protected by &drm_device.object_name_lock. 295 */ 296 unsigned handle_count; 297 298 /** 299 * @dev: DRM dev this object belongs to. 300 */ 301 struct drm_device *dev; 302 303 /** 304 * @filp: 305 * 306 * SHMEM file node used as backing storage for swappable buffer objects. 307 * GEM also supports driver private objects with driver-specific backing 308 * storage (contiguous DMA memory, special reserved blocks). In this 309 * case @filp is NULL. 310 */ 311 struct file *filp; 312 313 /** 314 * @vma_node: 315 * 316 * Mapping info for this object to support mmap. Drivers are supposed to 317 * allocate the mmap offset using drm_gem_create_mmap_offset(). The 318 * offset itself can be retrieved using drm_vma_node_offset_addr(). 319 * 320 * Memory mapping itself is handled by drm_gem_mmap(), which also checks 321 * that userspace is allowed to access the object. 322 */ 323 struct drm_vma_offset_node vma_node; 324 325 /** 326 * @size: 327 * 328 * Size of the object, in bytes. Immutable over the object's 329 * lifetime. 330 */ 331 size_t size; 332 333 /** 334 * @name: 335 * 336 * Global name for this object, starts at 1. 0 means unnamed. 337 * Access is covered by &drm_device.object_name_lock. This is used by 338 * the GEM_FLINK and GEM_OPEN ioctls. 339 */ 340 int name; 341 342 /** 343 * @dma_buf: 344 * 345 * dma-buf associated with this GEM object. 346 * 347 * Pointer to the dma-buf associated with this gem object (either 348 * through importing or exporting). We break the resulting reference 349 * loop when the last gem handle for this object is released. 350 * 351 * Protected by &drm_device.object_name_lock. 352 */ 353 struct dma_buf *dma_buf; 354 355 /** 356 * @import_attach: 357 * 358 * dma-buf attachment backing this object. 359 * 360 * Any foreign dma_buf imported as a gem object has this set to the 361 * attachment point for the device. This is invariant over the lifetime 362 * of a gem object. 363 * 364 * The &drm_gem_object_funcs.free callback is responsible for 365 * cleaning up the dma_buf attachment and references acquired at import 366 * time. 367 * 368 * Note that the drm gem/prime core does not depend upon drivers setting 369 * this field any more. So for drivers where this doesn't make sense 370 * (e.g. virtual devices or a displaylink behind an usb bus) they can 371 * simply leave it as NULL. 372 */ 373 struct dma_buf_attachment *import_attach; 374 375 /** 376 * @resv: 377 * 378 * Pointer to reservation object associated with the this GEM object. 379 * 380 * Normally (@resv == &@_resv) except for imported GEM objects. 381 */ 382 struct dma_resv *resv; 383 384 /** 385 * @_resv: 386 * 387 * A reservation object for this GEM object. 388 * 389 * This is unused for imported GEM objects. 390 */ 391 struct dma_resv _resv; 392 393 /** 394 * @gpuva: 395 * 396 * Provides the list of GPU VAs attached to this GEM object. 397 * 398 * Drivers should lock list accesses with the GEMs &dma_resv lock 399 * (&drm_gem_object.resv) or a custom lock if one is provided. 400 */ 401 struct { 402 struct list_head list; 403 404 #ifdef CONFIG_LOCKDEP 405 struct lockdep_map *lock_dep_map; 406 #endif 407 } gpuva; 408 409 /** 410 * @funcs: 411 * 412 * Optional GEM object functions. If this is set, it will be used instead of the 413 * corresponding &drm_driver GEM callbacks. 414 * 415 * New drivers should use this. 416 * 417 */ 418 const struct drm_gem_object_funcs *funcs; 419 420 /** 421 * @lru_node: 422 * 423 * List node in a &drm_gem_lru. 424 */ 425 struct list_head lru_node; 426 427 /** 428 * @lru: 429 * 430 * The current LRU list that the GEM object is on. 431 */ 432 struct drm_gem_lru *lru; 433 }; 434 435 /** 436 * DRM_GEM_FOPS - Default drm GEM file operations 437 * 438 * This macro provides a shorthand for setting the GEM file ops in the 439 * &file_operations structure. If all you need are the default ops, use 440 * DEFINE_DRM_GEM_FOPS instead. 441 */ 442 #define DRM_GEM_FOPS \ 443 .open = drm_open,\ 444 .release = drm_release,\ 445 .unlocked_ioctl = drm_ioctl,\ 446 .compat_ioctl = drm_compat_ioctl,\ 447 .poll = drm_poll,\ 448 .read = drm_read,\ 449 .llseek = noop_llseek,\ 450 .mmap = drm_gem_mmap 451 452 /** 453 * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers 454 * @name: name for the generated structure 455 * 456 * This macro autogenerates a suitable &struct file_operations for GEM based 457 * drivers, which can be assigned to &drm_driver.fops. Note that this structure 458 * cannot be shared between drivers, because it contains a reference to the 459 * current module using THIS_MODULE. 460 * 461 * Note that the declaration is already marked as static - if you need a 462 * non-static version of this you're probably doing it wrong and will break the 463 * THIS_MODULE reference by accident. 464 */ 465 #define DEFINE_DRM_GEM_FOPS(name) \ 466 static const struct file_operations name = {\ 467 .owner = THIS_MODULE,\ 468 DRM_GEM_FOPS,\ 469 } 470 471 void drm_gem_object_release(struct drm_gem_object *obj); 472 void drm_gem_object_free(struct kref *kref); 473 int drm_gem_object_init(struct drm_device *dev, 474 struct drm_gem_object *obj, size_t size); 475 void drm_gem_private_object_init(struct drm_device *dev, 476 struct drm_gem_object *obj, size_t size); 477 void drm_gem_private_object_fini(struct drm_gem_object *obj); 478 void drm_gem_vm_open(struct vm_area_struct *vma); 479 void drm_gem_vm_close(struct vm_area_struct *vma); 480 int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, 481 struct vm_area_struct *vma); 482 int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 483 484 /** 485 * drm_gem_object_get - acquire a GEM buffer object reference 486 * @obj: GEM buffer object 487 * 488 * This function acquires an additional reference to @obj. It is illegal to 489 * call this without already holding a reference. No locks required. 490 */ 491 static inline void drm_gem_object_get(struct drm_gem_object *obj) 492 { 493 kref_get(&obj->refcount); 494 } 495 496 __attribute__((nonnull)) 497 static inline void 498 __drm_gem_object_put(struct drm_gem_object *obj) 499 { 500 kref_put(&obj->refcount, drm_gem_object_free); 501 } 502 503 /** 504 * drm_gem_object_put - drop a GEM buffer object reference 505 * @obj: GEM buffer object 506 * 507 * This releases a reference to @obj. 508 */ 509 static inline void 510 drm_gem_object_put(struct drm_gem_object *obj) 511 { 512 if (obj) 513 __drm_gem_object_put(obj); 514 } 515 516 int drm_gem_handle_create(struct drm_file *file_priv, 517 struct drm_gem_object *obj, 518 u32 *handlep); 519 int drm_gem_handle_delete(struct drm_file *filp, u32 handle); 520 521 522 void drm_gem_free_mmap_offset(struct drm_gem_object *obj); 523 int drm_gem_create_mmap_offset(struct drm_gem_object *obj); 524 int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size); 525 526 struct page **drm_gem_get_pages(struct drm_gem_object *obj); 527 void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, 528 bool dirty, bool accessed); 529 530 int drm_gem_vmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map); 531 void drm_gem_vunmap_unlocked(struct drm_gem_object *obj, struct iosys_map *map); 532 533 int drm_gem_objects_lookup(struct drm_file *filp, void __user *bo_handles, 534 int count, struct drm_gem_object ***objs_out); 535 struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle); 536 long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle, 537 bool wait_all, unsigned long timeout); 538 int drm_gem_lock_reservations(struct drm_gem_object **objs, int count, 539 struct ww_acquire_ctx *acquire_ctx); 540 void drm_gem_unlock_reservations(struct drm_gem_object **objs, int count, 541 struct ww_acquire_ctx *acquire_ctx); 542 int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, 543 u32 handle, u64 *offset); 544 545 void drm_gem_lru_init(struct drm_gem_lru *lru, struct mutex *lock); 546 void drm_gem_lru_remove(struct drm_gem_object *obj); 547 void drm_gem_lru_move_tail_locked(struct drm_gem_lru *lru, struct drm_gem_object *obj); 548 void drm_gem_lru_move_tail(struct drm_gem_lru *lru, struct drm_gem_object *obj); 549 unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru, 550 unsigned int nr_to_scan, 551 unsigned long *remaining, 552 bool (*shrink)(struct drm_gem_object *obj)); 553 554 int drm_gem_evict(struct drm_gem_object *obj); 555 556 /** 557 * drm_gem_object_is_shared_for_memory_stats - helper for shared memory stats 558 * 559 * This helper should only be used for fdinfo shared memory stats to determine 560 * if a GEM object is shared. 561 * 562 * @obj: obj in question 563 */ 564 static inline bool drm_gem_object_is_shared_for_memory_stats(struct drm_gem_object *obj) 565 { 566 return (obj->handle_count > 1) || obj->dma_buf; 567 } 568 569 #ifdef CONFIG_LOCKDEP 570 /** 571 * drm_gem_gpuva_set_lock() - Set the lock protecting accesses to the gpuva list. 572 * @obj: the &drm_gem_object 573 * @lock: the lock used to protect the gpuva list. The locking primitive 574 * must contain a dep_map field. 575 * 576 * Call this if you're not proctecting access to the gpuva list with the 577 * dma-resv lock, but with a custom lock. 578 */ 579 #define drm_gem_gpuva_set_lock(obj, lock) \ 580 if (!WARN((obj)->gpuva.lock_dep_map, \ 581 "GEM GPUVA lock should be set only once.")) \ 582 (obj)->gpuva.lock_dep_map = &(lock)->dep_map 583 #define drm_gem_gpuva_assert_lock_held(obj) \ 584 lockdep_assert((obj)->gpuva.lock_dep_map ? \ 585 lock_is_held((obj)->gpuva.lock_dep_map) : \ 586 dma_resv_held((obj)->resv)) 587 #else 588 #define drm_gem_gpuva_set_lock(obj, lock) do {} while (0) 589 #define drm_gem_gpuva_assert_lock_held(obj) do {} while (0) 590 #endif 591 592 /** 593 * drm_gem_gpuva_init() - initialize the gpuva list of a GEM object 594 * @obj: the &drm_gem_object 595 * 596 * This initializes the &drm_gem_object's &drm_gpuvm_bo list. 597 * 598 * Calling this function is only necessary for drivers intending to support the 599 * &drm_driver_feature DRIVER_GEM_GPUVA. 600 * 601 * See also drm_gem_gpuva_set_lock(). 602 */ 603 static inline void drm_gem_gpuva_init(struct drm_gem_object *obj) 604 { 605 INIT_LIST_HEAD(&obj->gpuva.list); 606 } 607 608 /** 609 * drm_gem_for_each_gpuvm_bo() - iterator to walk over a list of &drm_gpuvm_bo 610 * @entry__: &drm_gpuvm_bo structure to assign to in each iteration step 611 * @obj__: the &drm_gem_object the &drm_gpuvm_bo to walk are associated with 612 * 613 * This iterator walks over all &drm_gpuvm_bo structures associated with the 614 * &drm_gem_object. 615 */ 616 #define drm_gem_for_each_gpuvm_bo(entry__, obj__) \ 617 list_for_each_entry(entry__, &(obj__)->gpuva.list, list.entry.gem) 618 619 /** 620 * drm_gem_for_each_gpuvm_bo_safe() - iterator to safely walk over a list of 621 * &drm_gpuvm_bo 622 * @entry__: &drm_gpuvm_bostructure to assign to in each iteration step 623 * @next__: &next &drm_gpuvm_bo to store the next step 624 * @obj__: the &drm_gem_object the &drm_gpuvm_bo to walk are associated with 625 * 626 * This iterator walks over all &drm_gpuvm_bo structures associated with the 627 * &drm_gem_object. It is implemented with list_for_each_entry_safe(), hence 628 * it is save against removal of elements. 629 */ 630 #define drm_gem_for_each_gpuvm_bo_safe(entry__, next__, obj__) \ 631 list_for_each_entry_safe(entry__, next__, &(obj__)->gpuva.list, list.entry.gem) 632 633 #endif /* __DRM_GEM_H__ */ 634