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("$FreeBSD$"); 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 65 int 66 drm_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 81 void 82 drm_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 94 int 95 drm_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 } 112 113 int 114 drm_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 } 129 130 131 struct drm_gem_object * 132 drm_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); 144 dealloc: 145 vm_object_deallocate(obj->vm_obj); 146 free: 147 free(obj, DRM_MEM_DRIVER); 148 return (NULL); 149 } 150 151 void 152 drm_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 } 161 162 void 163 drm_gem_object_reference(struct drm_gem_object *obj) 164 { 165 166 KASSERT(obj->refcount > 0, ("Dangling obj %p", obj)); 167 refcount_acquire(&obj->refcount); 168 } 169 170 void 171 drm_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 } 179 180 void 181 drm_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 } 192 193 void 194 drm_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 } 200 201 void 202 drm_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 } 214 215 void 216 drm_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 } 227 228 void 229 drm_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 } 240 241 int 242 drm_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 } 253 254 int 255 drm_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 } 265 266 void 267 drm_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 } 275 276 int 277 drm_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 } 304 305 void 306 drm_gem_open(struct drm_device *dev, struct drm_file *file_priv) 307 { 308 309 drm_gem_names_init(&file_priv->object_names); 310 } 311 312 static int 313 drm_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 } 321 322 void 323 drm_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 } 330 331 int 332 drm_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 } 343 344 int 345 drm_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 } 370 371 struct drm_gem_object * 372 drm_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 } 381 382 static struct drm_gem_object * 383 drm_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 = __containerof(map_list, struct drm_gem_object, map_list); 400 return (obj); 401 } 402 403 int 404 drm_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 } 426 427 void 428 drm_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 } 442 443 int 444 drm_gem_mmap_single(struct drm_device *dev, vm_ooffset_t *offset, vm_size_t size, 445 struct vm_object **obj_res, int nprot) 446 { 447 struct drm_gem_object *gem_obj; 448 struct vm_object *vm_obj; 449 450 DRM_LOCK(dev); 451 gem_obj = drm_gem_object_from_offset(dev, *offset); 452 if (gem_obj == NULL) { 453 DRM_UNLOCK(dev); 454 return (ENODEV); 455 } 456 drm_gem_object_reference(gem_obj); 457 DRM_UNLOCK(dev); 458 vm_obj = cdev_pager_allocate(gem_obj, OBJT_MGTDEVICE, 459 dev->driver->gem_pager_ops, size, nprot, 460 DRM_GEM_MAPPING_MAPOFF(*offset), curthread->td_ucred); 461 if (vm_obj == NULL) { 462 drm_gem_object_unreference_unlocked(gem_obj); 463 return (EINVAL); 464 } 465 *offset = DRM_GEM_MAPPING_MAPOFF(*offset); 466 *obj_res = vm_obj; 467 return (0); 468 } 469 470 void 471 drm_gem_pager_dtr(void *handle) 472 { 473 struct drm_gem_object *obj; 474 struct drm_device *dev; 475 476 obj = handle; 477 dev = obj->dev; 478 479 DRM_LOCK(dev); 480 drm_gem_free_mmap_offset(obj); 481 drm_gem_object_unreference(obj); 482 DRM_UNLOCK(dev); 483 } 484