drm_gem.c revision 236927
1/*- 2 * Copyright (c) 2011 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Konstantin Belousov under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: stable/9/sys/dev/drm2/drm_gem.c 235783 2012-05-22 11:07:44Z kib $"); 32 33#include "opt_vm.h" 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/limits.h> 38#include <sys/lock.h> 39#include <sys/mutex.h> 40 41#include <vm/vm.h> 42#include <vm/vm_page.h> 43 44#include <dev/drm2/drmP.h> 45#include <dev/drm2/drm.h> 46#include <dev/drm2/drm_sarea.h> 47 48/* 49 * We make up offsets for buffer objects so we can recognize them at 50 * mmap time. 51 */ 52 53/* pgoff in mmap is an unsigned long, so we need to make sure that 54 * the faked up offset will fit 55 */ 56 57#if ULONG_MAX == UINT64_MAX 58#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) 59#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) 60#else 61#define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) 62#define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) 63#endif 64 65int 66drm_gem_init(struct drm_device *dev) 67{ 68 struct drm_gem_mm *mm; 69 70 drm_gem_names_init(&dev->object_names); 71 mm = malloc(sizeof(*mm), DRM_MEM_DRIVER, M_WAITOK); 72 dev->mm_private = mm; 73 if (drm_ht_create(&mm->offset_hash, 19) != 0) { 74 free(mm, DRM_MEM_DRIVER); 75 return (ENOMEM); 76 } 77 mm->idxunr = new_unrhdr(0, DRM_GEM_MAX_IDX, NULL); 78 return (0); 79} 80 81void 82drm_gem_destroy(struct drm_device *dev) 83{ 84 struct drm_gem_mm *mm; 85 86 mm = dev->mm_private; 87 dev->mm_private = NULL; 88 drm_ht_remove(&mm->offset_hash); 89 delete_unrhdr(mm->idxunr); 90 free(mm, DRM_MEM_DRIVER); 91 drm_gem_names_fini(&dev->object_names); 92} 93 94int 95drm_gem_object_init(struct drm_device *dev, struct drm_gem_object *obj, 96 size_t size) 97{ 98 99 KASSERT((size & (PAGE_SIZE - 1)) == 0, 100 ("Bad size %ju", (uintmax_t)size)); 101 102 obj->dev = dev; 103 obj->vm_obj = vm_pager_allocate(OBJT_DEFAULT, NULL, size, 104 VM_PROT_READ | VM_PROT_WRITE, 0, curthread->td_ucred); 105 106 obj->refcount = 1; 107 obj->handle_count = 0; 108 obj->size = size; 109 110 return (0); 111} 112 113int 114drm_gem_private_object_init(struct drm_device *dev, struct drm_gem_object *obj, 115 size_t size) 116{ 117 118 MPASS((size & (PAGE_SIZE - 1)) == 0); 119 120 obj->dev = dev; 121 obj->vm_obj = NULL; 122 123 obj->refcount = 1; 124 atomic_set(&obj->handle_count, 0); 125 obj->size = size; 126 127 return (0); 128} 129 130 131struct drm_gem_object * 132drm_gem_object_alloc(struct drm_device *dev, size_t size) 133{ 134 struct drm_gem_object *obj; 135 136 obj = malloc(sizeof(*obj), DRM_MEM_DRIVER, M_WAITOK | M_ZERO); 137 if (drm_gem_object_init(dev, obj, size) != 0) 138 goto free; 139 140 if (dev->driver->gem_init_object != NULL && 141 dev->driver->gem_init_object(obj) != 0) 142 goto dealloc; 143 return (obj); 144dealloc: 145 vm_object_deallocate(obj->vm_obj); 146free: 147 free(obj, DRM_MEM_DRIVER); 148 return (NULL); 149} 150 151void 152drm_gem_object_free(struct drm_gem_object *obj) 153{ 154 struct drm_device *dev; 155 156 dev = obj->dev; 157 DRM_LOCK_ASSERT(dev); 158 if (dev->driver->gem_free_object != NULL) 159 dev->driver->gem_free_object(obj); 160} 161 162void 163drm_gem_object_reference(struct drm_gem_object *obj) 164{ 165 166 KASSERT(obj->refcount > 0, ("Dandling obj %p", obj)); 167 refcount_acquire(&obj->refcount); 168} 169 170void 171drm_gem_object_unreference(struct drm_gem_object *obj) 172{ 173 174 if (obj == NULL) 175 return; 176 if (refcount_release(&obj->refcount)) 177 drm_gem_object_free(obj); 178} 179 180void 181drm_gem_object_unreference_unlocked(struct drm_gem_object *obj) 182{ 183 struct drm_device *dev; 184 185 if (obj == NULL) 186 return; 187 dev = obj->dev; 188 DRM_LOCK(dev); 189 drm_gem_object_unreference(obj); 190 DRM_UNLOCK(dev); 191} 192 193void 194drm_gem_object_handle_reference(struct drm_gem_object *obj) 195{ 196 197 drm_gem_object_reference(obj); 198 atomic_add_rel_int(&obj->handle_count, 1); 199} 200 201void 202drm_gem_object_handle_free(struct drm_gem_object *obj) 203{ 204 struct drm_device *dev; 205 struct drm_gem_object *obj1; 206 207 dev = obj->dev; 208 if (obj->name != 0) { 209 obj1 = drm_gem_names_remove(&dev->object_names, obj->name); 210 obj->name = 0; 211 drm_gem_object_unreference(obj1); 212 } 213} 214 215void 216drm_gem_object_handle_unreference(struct drm_gem_object *obj) 217{ 218 219 if (obj == NULL || 220 atomic_load_acq_int(&obj->handle_count) == 0) 221 return; 222 223 if (atomic_fetchadd_int(&obj->handle_count, -1) == 1) 224 drm_gem_object_handle_free(obj); 225 drm_gem_object_unreference(obj); 226} 227 228void 229drm_gem_object_handle_unreference_unlocked(struct drm_gem_object *obj) 230{ 231 232 if (obj == NULL || 233 atomic_load_acq_int(&obj->handle_count) == 0) 234 return; 235 236 if (atomic_fetchadd_int(&obj->handle_count, -1) == 1) 237 drm_gem_object_handle_free(obj); 238 drm_gem_object_unreference_unlocked(obj); 239} 240 241int 242drm_gem_handle_create(struct drm_file *file_priv, struct drm_gem_object *obj, 243 uint32_t *handle) 244{ 245 int error; 246 247 error = drm_gem_name_create(&file_priv->object_names, obj, handle); 248 if (error != 0) 249 return (error); 250 drm_gem_object_handle_reference(obj); 251 return (0); 252} 253 254int 255drm_gem_handle_delete(struct drm_file *file_priv, uint32_t handle) 256{ 257 struct drm_gem_object *obj; 258 259 obj = drm_gem_names_remove(&file_priv->object_names, handle); 260 if (obj == NULL) 261 return (EINVAL); 262 drm_gem_object_handle_unreference_unlocked(obj); 263 return (0); 264} 265 266void 267drm_gem_object_release(struct drm_gem_object *obj) 268{ 269 270 /* 271 * obj->vm_obj can be NULL for private gem objects. 272 */ 273 vm_object_deallocate(obj->vm_obj); 274} 275 276int 277drm_gem_open_ioctl(struct drm_device *dev, void *data, 278 struct drm_file *file_priv) 279{ 280 struct drm_gem_open *args; 281 struct drm_gem_object *obj; 282 int ret; 283 uint32_t handle; 284 285 if (!drm_core_check_feature(dev, DRIVER_GEM)) 286 return (ENODEV); 287 args = data; 288 289 obj = drm_gem_name_ref(&dev->object_names, args->name, 290 (void (*)(void *))drm_gem_object_reference); 291 if (obj == NULL) 292 return (ENOENT); 293 handle = 0; 294 ret = drm_gem_handle_create(file_priv, obj, &handle); 295 drm_gem_object_unreference_unlocked(obj); 296 if (ret != 0) 297 return (ret); 298 299 args->handle = handle; 300 args->size = obj->size; 301 302 return (0); 303} 304 305void 306drm_gem_open(struct drm_device *dev, struct drm_file *file_priv) 307{ 308 309 drm_gem_names_init(&file_priv->object_names); 310} 311 312static int 313drm_gem_object_release_handle(uint32_t name, void *ptr, void *arg) 314{ 315 struct drm_gem_object *obj; 316 317 obj = ptr; 318 drm_gem_object_handle_unreference(obj); 319 return (0); 320} 321 322void 323drm_gem_release(struct drm_device *dev, struct drm_file *file_priv) 324{ 325 326 drm_gem_names_foreach(&file_priv->object_names, 327 drm_gem_object_release_handle, NULL); 328 drm_gem_names_fini(&file_priv->object_names); 329} 330 331int 332drm_gem_close_ioctl(struct drm_device *dev, void *data, 333 struct drm_file *file_priv) 334{ 335 struct drm_gem_close *args; 336 337 if (!drm_core_check_feature(dev, DRIVER_GEM)) 338 return (ENODEV); 339 args = data; 340 341 return (drm_gem_handle_delete(file_priv, args->handle)); 342} 343 344int 345drm_gem_flink_ioctl(struct drm_device *dev, void *data, 346 struct drm_file *file_priv) 347{ 348 struct drm_gem_flink *args; 349 struct drm_gem_object *obj; 350 int error; 351 352 if (!drm_core_check_feature(dev, DRIVER_GEM)) 353 return (ENODEV); 354 args = data; 355 356 obj = drm_gem_name_ref(&file_priv->object_names, args->handle, 357 (void (*)(void *))drm_gem_object_reference); 358 if (obj == NULL) 359 return (ENOENT); 360 error = drm_gem_name_create(&dev->object_names, obj, &obj->name); 361 if (error != 0) { 362 if (error == EALREADY) 363 error = 0; 364 drm_gem_object_unreference_unlocked(obj); 365 } 366 if (error == 0) 367 args->name = obj->name; 368 return (error); 369} 370 371struct drm_gem_object * 372drm_gem_object_lookup(struct drm_device *dev, struct drm_file *file_priv, 373 uint32_t handle) 374{ 375 struct drm_gem_object *obj; 376 377 obj = drm_gem_name_ref(&file_priv->object_names, handle, 378 (void (*)(void *))drm_gem_object_reference); 379 return (obj); 380} 381 382static struct drm_gem_object * 383drm_gem_object_from_offset(struct drm_device *dev, vm_ooffset_t offset) 384{ 385 struct drm_gem_object *obj; 386 struct drm_gem_mm *mm; 387 struct drm_hash_item *map_list; 388 389 if ((offset & DRM_GEM_MAPPING_MASK) != DRM_GEM_MAPPING_KEY) 390 return (NULL); 391 offset &= ~DRM_GEM_MAPPING_KEY; 392 mm = dev->mm_private; 393 if (drm_ht_find_item(&mm->offset_hash, DRM_GEM_MAPPING_IDX(offset), 394 &map_list) != 0) { 395 DRM_DEBUG("drm_gem_object_from_offset: offset 0x%jx obj not found\n", 396 (uintmax_t)offset); 397 return (NULL); 398 } 399 obj = member2struct(drm_gem_object, map_list, map_list); 400 return (obj); 401} 402 403int 404drm_gem_create_mmap_offset(struct drm_gem_object *obj) 405{ 406 struct drm_device *dev; 407 struct drm_gem_mm *mm; 408 int ret; 409 410 if (obj->on_map) 411 return (0); 412 dev = obj->dev; 413 mm = dev->mm_private; 414 ret = 0; 415 416 obj->map_list.key = alloc_unr(mm->idxunr); 417 ret = drm_ht_insert_item(&mm->offset_hash, &obj->map_list); 418 if (ret != 0) { 419 DRM_ERROR("failed to add to map hash\n"); 420 free_unr(mm->idxunr, obj->map_list.key); 421 return (ret); 422 } 423 obj->on_map = true; 424 return (0); 425} 426 427void 428drm_gem_free_mmap_offset(struct drm_gem_object *obj) 429{ 430 struct drm_hash_item *list; 431 struct drm_gem_mm *mm; 432 433 if (!obj->on_map) 434 return; 435 mm = obj->dev->mm_private; 436 list = &obj->map_list; 437 438 drm_ht_remove_item(&mm->offset_hash, list); 439 free_unr(mm->idxunr, list->key); 440 obj->on_map = false; 441} 442 443int 444drm_gem_mmap_single(struct cdev *kdev, vm_ooffset_t *offset, vm_size_t size, 445 struct vm_object **obj_res, int nprot) 446{ 447 struct drm_device *dev; 448 struct drm_gem_object *gem_obj; 449 struct vm_object *vm_obj; 450 451 dev = drm_get_device_from_kdev(kdev); 452 if ((dev->driver->driver_features & DRIVER_GEM) == 0) 453 return (ENODEV); 454 DRM_LOCK(dev); 455 gem_obj = drm_gem_object_from_offset(dev, *offset); 456 if (gem_obj == NULL) { 457 DRM_UNLOCK(dev); 458 return (ENODEV); 459 } 460 drm_gem_object_reference(gem_obj); 461 DRM_UNLOCK(dev); 462 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE, 463 dev->driver->gem_pager_ops, size, nprot, 464 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred); 465 if (vm_obj == NULL) { 466 drm_gem_object_unreference_unlocked(gem_obj); 467 return (EINVAL); 468 } 469 *offset = DRM_GEM_MAPPING_MAPOFF(*offset); 470 *obj_res = vm_obj; 471 return (0); 472} 473 474void 475drm_gem_pager_dtr(void *handle) 476{ 477 struct drm_gem_object *obj; 478 struct drm_device *dev; 479 480 obj = handle; 481 dev = obj->dev; 482 483 DRM_LOCK(dev); 484 drm_gem_free_mmap_offset(obj); 485 drm_gem_object_unreference(obj); 486 DRM_UNLOCK(dev); 487} 488