1 /************************************************************************** 2 * 3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the 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 NON-INFRINGEMENT. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 24 * USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 * $FreeBSD: head/sys/dev/drm2/ttm/ttm_memory.c 248663 2013-03-23 20:46:47Z dumbbell $ 27 **************************************************************************/ 28 29 #define pr_fmt(fmt) "[TTM] " fmt 30 31 #include <drm/drmP.h> 32 #include <drm/ttm/ttm_memory.h> 33 #include <drm/ttm/ttm_module.h> 34 #include <drm/ttm/ttm_page_alloc.h> 35 #include <linux/export.h> 36 37 #define TTM_MEMORY_ALLOC_RETRIES 4 38 39 struct ttm_mem_zone { 40 struct kobject kobj; 41 struct ttm_mem_global *glob; 42 const char *name; 43 uint64_t zone_mem; 44 uint64_t emer_mem; 45 uint64_t max_mem; 46 uint64_t swap_limit; 47 uint64_t used_mem; 48 }; 49 50 static struct attribute ttm_mem_sys = { 51 .name = "zone_memory", 52 .mode = S_IRUGO 53 }; 54 static struct attribute ttm_mem_emer = { 55 .name = "emergency_memory", 56 .mode = S_IRUGO | S_IWUSR 57 }; 58 static struct attribute ttm_mem_max = { 59 .name = "available_memory", 60 .mode = S_IRUGO | S_IWUSR 61 }; 62 static struct attribute ttm_mem_swap = { 63 .name = "swap_limit", 64 .mode = S_IRUGO | S_IWUSR 65 }; 66 static struct attribute ttm_mem_used = { 67 .name = "used_memory", 68 .mode = S_IRUGO 69 }; 70 71 static void ttm_mem_zone_kobj_release(struct kobject *kobj) 72 { 73 struct ttm_mem_zone *zone = 74 container_of(kobj, struct ttm_mem_zone, kobj); 75 76 pr_info("Zone %7s: Used memory at exit: %llu kiB\n", 77 zone->name, (unsigned long long)zone->used_mem >> 10); 78 kfree(zone); 79 } 80 81 static ssize_t ttm_mem_zone_show(struct kobject *kobj, 82 struct attribute *attr, 83 char *buffer) 84 { 85 struct ttm_mem_zone *zone = 86 container_of(kobj, struct ttm_mem_zone, kobj); 87 uint64_t val = 0; 88 89 spin_lock(&zone->glob->lock); 90 if (attr == &ttm_mem_sys) 91 val = zone->zone_mem; 92 else if (attr == &ttm_mem_emer) 93 val = zone->emer_mem; 94 else if (attr == &ttm_mem_max) 95 val = zone->max_mem; 96 else if (attr == &ttm_mem_swap) 97 val = zone->swap_limit; 98 else if (attr == &ttm_mem_used) 99 val = zone->used_mem; 100 spin_unlock(&zone->glob->lock); 101 102 return ksnprintf(buffer, PAGE_SIZE, "%llu\n", 103 (unsigned long long) val >> 10); 104 } 105 106 static void ttm_check_swapping(struct ttm_mem_global *glob); 107 108 static ssize_t ttm_mem_zone_store(struct kobject *kobj, 109 struct attribute *attr, 110 const char *buffer, 111 size_t size) 112 { 113 struct ttm_mem_zone *zone = 114 container_of(kobj, struct ttm_mem_zone, kobj); 115 int chars; 116 unsigned long val; 117 uint64_t val64; 118 119 chars = ksscanf(buffer, "%lu", &val); 120 if (chars == 0) 121 return size; 122 123 val64 = val; 124 val64 <<= 10; 125 126 spin_lock(&zone->glob->lock); 127 if (val64 > zone->zone_mem) 128 val64 = zone->zone_mem; 129 if (attr == &ttm_mem_emer) { 130 zone->emer_mem = val64; 131 if (zone->max_mem > val64) 132 zone->max_mem = val64; 133 } else if (attr == &ttm_mem_max) { 134 zone->max_mem = val64; 135 if (zone->emer_mem < val64) 136 zone->emer_mem = val64; 137 } else if (attr == &ttm_mem_swap) 138 zone->swap_limit = val64; 139 spin_unlock(&zone->glob->lock); 140 141 ttm_check_swapping(zone->glob); 142 143 return size; 144 } 145 146 static struct attribute *ttm_mem_zone_attrs[] = { 147 &ttm_mem_sys, 148 &ttm_mem_emer, 149 &ttm_mem_max, 150 &ttm_mem_swap, 151 &ttm_mem_used, 152 NULL 153 }; 154 155 static const struct sysfs_ops ttm_mem_zone_ops = { 156 .show = &ttm_mem_zone_show, 157 .store = &ttm_mem_zone_store 158 }; 159 160 static struct kobj_type ttm_mem_zone_kobj_type = { 161 .release = &ttm_mem_zone_kobj_release, 162 .sysfs_ops = &ttm_mem_zone_ops, 163 .default_attrs = ttm_mem_zone_attrs, 164 }; 165 166 static void ttm_mem_global_kobj_release(struct kobject *kobj) 167 { 168 struct ttm_mem_global *glob = 169 container_of(kobj, struct ttm_mem_global, kobj); 170 171 kfree(glob); 172 } 173 174 static struct kobj_type ttm_mem_glob_kobj_type = { 175 .release = &ttm_mem_global_kobj_release, 176 }; 177 178 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob, 179 bool from_wq, uint64_t extra) 180 { 181 unsigned int i; 182 struct ttm_mem_zone *zone; 183 uint64_t target; 184 185 for (i = 0; i < glob->num_zones; ++i) { 186 zone = glob->zones[i]; 187 188 if (from_wq) 189 target = zone->swap_limit; 190 else if (priv_check(curthread, PRIV_VM_MLOCK) == 0) 191 target = zone->emer_mem; 192 else 193 target = zone->max_mem; 194 195 target = (extra > target) ? 0ULL : target; 196 197 if (zone->used_mem > target) 198 return true; 199 } 200 return false; 201 } 202 203 /** 204 * At this point we only support a single shrink callback. 205 * Extend this if needed, perhaps using a linked list of callbacks. 206 * Note that this function is reentrant: 207 * many threads may try to swap out at any given time. 208 */ 209 210 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq, 211 uint64_t extra) 212 { 213 int ret; 214 struct ttm_mem_shrink *shrink; 215 216 spin_lock(&glob->lock); 217 if (glob->shrink == NULL) 218 goto out; 219 220 while (ttm_zones_above_swap_target(glob, from_wq, extra)) { 221 shrink = glob->shrink; 222 spin_unlock(&glob->lock); 223 ret = shrink->do_shrink(shrink); 224 spin_lock(&glob->lock); 225 if (unlikely(ret != 0)) 226 goto out; 227 } 228 out: 229 spin_unlock(&glob->lock); 230 } 231 232 233 234 static void ttm_shrink_work(void *arg, int pending __unused) 235 { 236 struct ttm_mem_global *glob = arg; 237 238 ttm_shrink(glob, true, 0ULL); 239 } 240 241 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob, 242 uint64_t mem) 243 { 244 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); 245 int ret; 246 247 zone->name = "kernel"; 248 zone->zone_mem = mem; 249 zone->max_mem = mem >> 1; 250 zone->emer_mem = (mem >> 1) + (mem >> 2); 251 zone->swap_limit = zone->max_mem - (mem >> 3); 252 zone->used_mem = 0; 253 zone->glob = glob; 254 glob->zone_kernel = zone; 255 ret = kobject_init_and_add( 256 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); 257 if (unlikely(ret != 0)) { 258 kobject_put(&zone->kobj); 259 return ret; 260 } 261 glob->zones[glob->num_zones++] = zone; 262 return 0; 263 } 264 265 #ifdef CONFIG_HIGHMEM 266 #else 267 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob, 268 uint64_t mem) 269 { 270 struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL); 271 int ret; 272 273 /** 274 * No special dma32 zone needed. 275 */ 276 277 if ((physmem * PAGE_SIZE) <= ((uint64_t) 1ULL << 32)) { 278 kfree(zone); 279 return 0; 280 } 281 282 /* 283 * Limit max dma32 memory to 4GB for now 284 * until we can figure out how big this 285 * zone really is. 286 */ 287 if (mem > ((uint64_t) 1ULL << 32)) 288 mem = ((uint64_t) 1ULL << 32); 289 290 zone->name = "dma32"; 291 zone->zone_mem = mem; 292 zone->max_mem = mem >> 1; 293 zone->emer_mem = (mem >> 1) + (mem >> 2); 294 zone->swap_limit = zone->max_mem - (mem >> 3); 295 zone->used_mem = 0; 296 zone->glob = glob; 297 glob->zone_dma32 = zone; 298 ret = kobject_init_and_add( 299 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name); 300 if (unlikely(ret != 0)) { 301 kobject_put(&zone->kobj); 302 return ret; 303 } 304 glob->zones[glob->num_zones++] = zone; 305 return 0; 306 } 307 #endif 308 309 int ttm_mem_global_init(struct ttm_mem_global *glob) 310 { 311 u_int64_t mem; 312 int ret; 313 int i; 314 struct ttm_mem_zone *zone; 315 316 spin_init(&glob->lock, "ttmemglob"); 317 glob->swap_queue = taskqueue_create("ttm_swap", M_WAITOK, 318 taskqueue_thread_enqueue, &glob->swap_queue); 319 taskqueue_start_threads(&glob->swap_queue, 1, TDPRI_KERN_DAEMON, 320 -1, "ttm swap"); 321 TASK_INIT(&glob->work, 0, ttm_shrink_work, glob); 322 ret = kobject_init_and_add( 323 &glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting"); 324 if (unlikely(ret != 0)) { 325 kobject_put(&glob->kobj); 326 return ret; 327 } 328 329 /* 330 * Managed contiguous memory for TTM. Only use kernel-reserved 331 * dma memory for TTM, which can be controlled via /boot/loader.conf 332 * (e.g. vm.dma_reserved=256m). This is the only truly dependable 333 * DMA memory. 334 */ 335 mem = (uint64_t)vm_contig_avail_pages() * PAGE_SIZE; 336 337 ret = ttm_mem_init_kernel_zone(glob, mem); 338 if (unlikely(ret != 0)) 339 goto out_no_zone; 340 ret = ttm_mem_init_dma32_zone(glob, mem); 341 if (unlikely(ret != 0)) 342 goto out_no_zone; 343 pr_info("(struct ttm_mem_global *)%p\n", glob); 344 for (i = 0; i < glob->num_zones; ++i) { 345 zone = glob->zones[i]; 346 pr_info("Zone %7s: Available graphics memory: %llu kiB\n", 347 zone->name, (unsigned long long)zone->max_mem >> 10); 348 } 349 ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); 350 ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE)); 351 return 0; 352 out_no_zone: 353 ttm_mem_global_release(glob); 354 return ret; 355 } 356 EXPORT_SYMBOL(ttm_mem_global_init); 357 358 void ttm_mem_global_release(struct ttm_mem_global *glob) 359 { 360 unsigned int i; 361 struct ttm_mem_zone *zone; 362 363 /* let the page allocator first stop the shrink work. */ 364 ttm_page_alloc_fini(); 365 ttm_dma_page_alloc_fini(); 366 367 taskqueue_drain(glob->swap_queue, &glob->work); 368 taskqueue_free(glob->swap_queue); 369 glob->swap_queue = NULL; 370 for (i = 0; i < glob->num_zones; ++i) { 371 zone = glob->zones[i]; 372 kobject_del(&zone->kobj); 373 kobject_put(&zone->kobj); 374 } 375 kobject_del(&glob->kobj); 376 kobject_put(&glob->kobj); 377 378 } 379 EXPORT_SYMBOL(ttm_mem_global_release); 380 381 static void ttm_check_swapping(struct ttm_mem_global *glob) 382 { 383 bool needs_swapping = false; 384 unsigned int i; 385 struct ttm_mem_zone *zone; 386 387 spin_lock(&glob->lock); 388 for (i = 0; i < glob->num_zones; ++i) { 389 zone = glob->zones[i]; 390 if (zone->used_mem > zone->swap_limit) { 391 needs_swapping = true; 392 break; 393 } 394 } 395 spin_unlock(&glob->lock); 396 397 if (unlikely(needs_swapping)) 398 taskqueue_enqueue(glob->swap_queue, &glob->work); 399 400 } 401 402 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob, 403 struct ttm_mem_zone *single_zone, 404 uint64_t amount) 405 { 406 unsigned int i; 407 struct ttm_mem_zone *zone; 408 409 spin_lock(&glob->lock); 410 for (i = 0; i < glob->num_zones; ++i) { 411 zone = glob->zones[i]; 412 if (single_zone && zone != single_zone) 413 continue; 414 zone->used_mem -= amount; 415 } 416 spin_unlock(&glob->lock); 417 } 418 419 void ttm_mem_global_free(struct ttm_mem_global *glob, 420 uint64_t amount) 421 { 422 ttm_mem_global_free_zone(glob, NULL, amount); 423 } 424 EXPORT_SYMBOL(ttm_mem_global_free); 425 426 static int ttm_mem_global_reserve(struct ttm_mem_global *glob, 427 struct ttm_mem_zone *single_zone, 428 uint64_t amount, bool reserve) 429 { 430 uint64_t limit; 431 int ret = -ENOMEM; 432 unsigned int i; 433 struct ttm_mem_zone *zone; 434 435 spin_lock(&glob->lock); 436 for (i = 0; i < glob->num_zones; ++i) { 437 zone = glob->zones[i]; 438 if (single_zone && zone != single_zone) 439 continue; 440 441 limit = (priv_check(curthread, PRIV_VM_MLOCK) == 0) ? 442 zone->emer_mem : zone->max_mem; 443 444 if (zone->used_mem > limit) 445 goto out_unlock; 446 } 447 448 if (reserve) { 449 for (i = 0; i < glob->num_zones; ++i) { 450 zone = glob->zones[i]; 451 if (single_zone && zone != single_zone) 452 continue; 453 zone->used_mem += amount; 454 } 455 } 456 457 ret = 0; 458 out_unlock: 459 spin_unlock(&glob->lock); 460 ttm_check_swapping(glob); 461 462 return ret; 463 } 464 465 466 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob, 467 struct ttm_mem_zone *single_zone, 468 uint64_t memory, 469 bool no_wait, bool interruptible) 470 { 471 int count = TTM_MEMORY_ALLOC_RETRIES; 472 473 while (unlikely(ttm_mem_global_reserve(glob, 474 single_zone, 475 memory, true) 476 != 0)) { 477 if (no_wait) 478 return -ENOMEM; 479 if (unlikely(count-- == 0)) 480 return -ENOMEM; 481 ttm_shrink(glob, false, memory + (memory >> 2) + 16); 482 } 483 484 return 0; 485 } 486 487 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory, 488 bool no_wait, bool interruptible) 489 { 490 /** 491 * Normal allocations of kernel memory are registered in 492 * all zones. 493 */ 494 495 return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait, 496 interruptible); 497 } 498 EXPORT_SYMBOL(ttm_mem_global_alloc); 499 500 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob, 501 struct page *page, 502 bool no_wait, bool interruptible) 503 { 504 505 struct ttm_mem_zone *zone = NULL; 506 507 /** 508 * Page allocations may be registed in a single zone 509 * only if highmem or !dma32. 510 */ 511 512 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) 513 zone = glob->zone_kernel; 514 return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait, 515 interruptible); 516 } 517 518 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page) 519 { 520 struct ttm_mem_zone *zone = NULL; 521 522 if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL) 523 zone = glob->zone_kernel; 524 ttm_mem_global_free_zone(glob, zone, PAGE_SIZE); 525 } 526 527 528 size_t ttm_round_pot(size_t size) 529 { 530 if ((size & (size - 1)) == 0) 531 return size; 532 else if (size > PAGE_SIZE) 533 return PAGE_ALIGN(size); 534 else { 535 size_t tmp_size = 4; 536 537 while (tmp_size < size) 538 tmp_size <<= 1; 539 540 return tmp_size; 541 } 542 return 0; 543 } 544 EXPORT_SYMBOL(ttm_round_pot); 545