drivers/gpu/drm/ttm/ttm_memory.c

   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  **************************************************************************/
  27
  28 #define pr_fmt(fmt) "[TTM] " fmt
  29
  30 #include <drm/ttm/ttm_memory.h>
  31 #include <drm/ttm/ttm_module.h>
  32 #include <drm/ttm/ttm_page_alloc.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/sched.h>
  35 #include <linux/wait.h>
  36 #include <linux/mm.h>
  37 #include <linux/module.h>
  38 #include <linux/slab.h>
  39
  40 #define TTM_MEMORY_ALLOC_RETRIES 4
  41
  42 struct ttm_mem_zone {
  43         struct kobject kobj;
  44         struct ttm_mem_global *glob;
  45         const char *name;
  46         uint64_t zone_mem;
  47         uint64_t emer_mem;
  48         uint64_t max_mem;
  49         uint64_t swap_limit;
  50         uint64_t used_mem;
  51 };
  52
  53 static struct attribute ttm_mem_sys = {
  54         .name = "zone_memory",
  55         .mode = S_IRUGO
  56 };
  57 static struct attribute ttm_mem_emer = {
  58         .name = "emergency_memory",
  59         .mode = S_IRUGO | S_IWUSR
  60 };
  61 static struct attribute ttm_mem_max = {
  62         .name = "available_memory",
  63         .mode = S_IRUGO | S_IWUSR
  64 };
  65 static struct attribute ttm_mem_swap = {
  66         .name = "swap_limit",
  67         .mode = S_IRUGO | S_IWUSR
  68 };
  69 static struct attribute ttm_mem_used = {
  70         .name = "used_memory",
  71         .mode = S_IRUGO
  72 };
  73
  74 static void ttm_mem_zone_kobj_release(struct kobject *kobj)
  75 {
  76         struct ttm_mem_zone *zone =
  77                 container_of(kobj, struct ttm_mem_zone, kobj);
  78
  79         pr_info("Zone %7s: Used memory at exit: %llu kiB\n",
  80                 zone->name, (unsigned long long)zone->used_mem >> 10);
  81         kfree(zone);
  82 }
  83
  84 static ssize_t ttm_mem_zone_show(struct kobject *kobj,
  85                                  struct attribute *attr,
  86                                  char *buffer)
  87 {
  88         struct ttm_mem_zone *zone =
  89                 container_of(kobj, struct ttm_mem_zone, kobj);
  90         uint64_t val = 0;
  91
  92         spin_lock(&zone->glob->lock);
  93         if (attr == &ttm_mem_sys)
  94                 val = zone->zone_mem;
  95         else if (attr == &ttm_mem_emer)
  96                 val = zone->emer_mem;
  97         else if (attr == &ttm_mem_max)
  98                 val = zone->max_mem;
  99         else if (attr == &ttm_mem_swap)
 100                 val = zone->swap_limit;
 101         else if (attr == &ttm_mem_used)
 102                 val = zone->used_mem;
 103         spin_unlock(&zone->glob->lock);
 104
 105         return snprintf(buffer, PAGE_SIZE, "%llu\n",
 106                         (unsigned long long) val >> 10);
 107 }
 108
 109 static void ttm_check_swapping(struct ttm_mem_global *glob);
 110
 111 static ssize_t ttm_mem_zone_store(struct kobject *kobj,
 112                                   struct attribute *attr,
 113                                   const char *buffer,
 114                                   size_t size)
 115 {
 116         struct ttm_mem_zone *zone =
 117                 container_of(kobj, struct ttm_mem_zone, kobj);
 118         int chars;
 119         unsigned long val;
 120         uint64_t val64;
 121
 122         chars = sscanf(buffer, "%lu", &val);
 123         if (chars == 0)
 124                 return size;
 125
 126         val64 = val;
 127         val64 <<= 10;
 128
 129         spin_lock(&zone->glob->lock);
 130         if (val64 > zone->zone_mem)
 131                 val64 = zone->zone_mem;
 132         if (attr == &ttm_mem_emer) {
 133                 zone->emer_mem = val64;
 134                 if (zone->max_mem > val64)
 135                         zone->max_mem = val64;
 136         } else if (attr == &ttm_mem_max) {
 137                 zone->max_mem = val64;
 138                 if (zone->emer_mem < val64)
 139                         zone->emer_mem = val64;
 140         } else if (attr == &ttm_mem_swap)
 141                 zone->swap_limit = val64;
 142         spin_unlock(&zone->glob->lock);
 143
 144         ttm_check_swapping(zone->glob);
 145
 146         return size;
 147 }
 148
 149 static struct attribute *ttm_mem_zone_attrs[] = {
 150         &ttm_mem_sys,
 151         &ttm_mem_emer,
 152         &ttm_mem_max,
 153         &ttm_mem_swap,
 154         &ttm_mem_used,
 155         NULL
 156 };
 157
 158 static const struct sysfs_ops ttm_mem_zone_ops = {
 159         .show = &ttm_mem_zone_show,
 160         .store = &ttm_mem_zone_store
 161 };
 162
 163 static struct kobj_type ttm_mem_zone_kobj_type = {
 164         .release = &ttm_mem_zone_kobj_release,
 165         .sysfs_ops = &ttm_mem_zone_ops,
 166         .default_attrs = ttm_mem_zone_attrs,
 167 };
 168
 169 static void ttm_mem_global_kobj_release(struct kobject *kobj)
 170 {
 171         struct ttm_mem_global *glob =
 172                 container_of(kobj, struct ttm_mem_global, kobj);
 173
 174         kfree(glob);
 175 }
 176
 177 static struct kobj_type ttm_mem_glob_kobj_type = {
 178         .release = &ttm_mem_global_kobj_release,
 179 };
 180
 181 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
 182                                         bool from_wq, uint64_t extra)
 183 {
 184         unsigned int i;
 185         struct ttm_mem_zone *zone;
 186         uint64_t target;
 187
 188         for (i = 0; i < glob->num_zones; ++i) {
 189                 zone = glob->zones[i];
 190
 191                 if (from_wq)
 192                         target = zone->swap_limit;
 193                 else if (capable(CAP_SYS_ADMIN))
 194                         target = zone->emer_mem;
 195                 else
 196                         target = zone->max_mem;
 197
 198                 target = (extra > target) ? 0ULL : target;
 199
 200                 if (zone->used_mem > target)
 201                         return true;
 202         }
 203         return false;
 204 }
 205
 206 /**
 207  * At this point we only support a single shrink callback.
 208  * Extend this if needed, perhaps using a linked list of callbacks.
 209  * Note that this function is reentrant:
 210  * many threads may try to swap out at any given time.
 211  */
 212
 213 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
 214                         uint64_t extra, struct ttm_operation_ctx *ctx)
 215 {
 216         int ret;
 217
 218         spin_lock(&glob->lock);
 219
 220         while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
 221                 spin_unlock(&glob->lock);
 222                 ret = ttm_bo_swapout(glob->bo_glob, ctx);
 223                 spin_lock(&glob->lock);
 224                 if (unlikely(ret != 0))
 225                         break;
 226         }
 227
 228         spin_unlock(&glob->lock);
 229 }
 230
 231 static void ttm_shrink_work(struct work_struct *work)
 232 {
 233         struct ttm_operation_ctx ctx = {
 234                 .interruptible = false,
 235                 .no_wait_gpu = false
 236         };
 237         struct ttm_mem_global *glob =
 238             container_of(work, struct ttm_mem_global, work);
 239
 240         ttm_shrink(glob, true, 0ULL, &ctx);
 241 }
 242
 243 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
 244                                     const struct sysinfo *si)
 245 {
 246         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 247         uint64_t mem;
 248         int ret;
 249
 250         if (unlikely(!zone))
 251                 return -ENOMEM;
 252
 253         mem = si->totalram - si->totalhigh;
 254         mem *= si->mem_unit;
 255
 256         zone->name = "kernel";
 257         zone->zone_mem = mem;
 258         zone->max_mem = mem >> 1;
 259         zone->emer_mem = (mem >> 1) + (mem >> 2);
 260         zone->swap_limit = zone->max_mem - (mem >> 3);
 261         zone->used_mem = 0;
 262         zone->glob = glob;
 263         glob->zone_kernel = zone;
 264         ret = kobject_init_and_add(
 265                 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
 266         if (unlikely(ret != 0)) {
 267                 kobject_put(&zone->kobj);
 268                 return ret;
 269         }
 270         glob->zones[glob->num_zones++] = zone;
 271         return 0;
 272 }
 273
 274 #ifdef CONFIG_HIGHMEM
 275 static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
 276                                      const struct sysinfo *si)
 277 {
 278         struct ttm_mem_zone *zone;
 279         uint64_t mem;
 280         int ret;
 281
 282         if (si->totalhigh == 0)
 283                 return 0;
 284
 285         zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 286         if (unlikely(!zone))
 287                 return -ENOMEM;
 288
 289         mem = si->totalram;
 290         mem *= si->mem_unit;
 291
 292         zone->name = "highmem";
 293         zone->zone_mem = mem;
 294         zone->max_mem = mem >> 1;
 295         zone->emer_mem = (mem >> 1) + (mem >> 2);
 296         zone->swap_limit = zone->max_mem - (mem >> 3);
 297         zone->used_mem = 0;
 298         zone->glob = glob;
 299         glob->zone_highmem = zone;
 300         ret = kobject_init_and_add(
 301                 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, "%s",
 302                 zone->name);
 303         if (unlikely(ret != 0)) {
 304                 kobject_put(&zone->kobj);
 305                 return ret;
 306         }
 307         glob->zones[glob->num_zones++] = zone;
 308         return 0;
 309 }
 310 #else
 311 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
 312                                    const struct sysinfo *si)
 313 {
 314         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 315         uint64_t mem;
 316         int ret;
 317
 318         if (unlikely(!zone))
 319                 return -ENOMEM;
 320
 321         mem = si->totalram;
 322         mem *= si->mem_unit;
 323
 324         /**
 325          * No special dma32 zone needed.
 326          */
 327
 328         if (mem <= ((uint64_t) 1ULL << 32)) {
 329                 kfree(zone);
 330                 return 0;
 331         }
 332
 333         /*
 334          * Limit max dma32 memory to 4GB for now
 335          * until we can figure out how big this
 336          * zone really is.
 337          */
 338
 339         mem = ((uint64_t) 1ULL << 32);
 340         zone->name = "dma32";
 341         zone->zone_mem = mem;
 342         zone->max_mem = mem >> 1;
 343         zone->emer_mem = (mem >> 1) + (mem >> 2);
 344         zone->swap_limit = zone->max_mem - (mem >> 3);
 345         zone->used_mem = 0;
 346         zone->glob = glob;
 347         glob->zone_dma32 = zone;
 348         ret = kobject_init_and_add(
 349                 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
 350         if (unlikely(ret != 0)) {
 351                 kobject_put(&zone->kobj);
 352                 return ret;
 353         }
 354         glob->zones[glob->num_zones++] = zone;
 355         return 0;
 356 }
 357 #endif
 358
 359 int ttm_mem_global_init(struct ttm_mem_global *glob)
 360 {
 361         struct sysinfo si;
 362         int ret;
 363         int i;
 364         struct ttm_mem_zone *zone;
 365
 366         spin_lock_init(&glob->lock);
 367         glob->swap_queue = create_singlethread_workqueue("ttm_swap");
 368         INIT_WORK(&glob->work, ttm_shrink_work);
 369         ret = kobject_init_and_add(
 370                 &glob->kobj, &ttm_mem_glob_kobj_type, ttm_get_kobj(), "memory_accounting");
 371         if (unlikely(ret != 0)) {
 372                 kobject_put(&glob->kobj);
 373                 return ret;
 374         }
 375
 376         si_meminfo(&si);
 377
 378         ret = ttm_mem_init_kernel_zone(glob, &si);
 379         if (unlikely(ret != 0))
 380                 goto out_no_zone;
 381 #ifdef CONFIG_HIGHMEM
 382         ret = ttm_mem_init_highmem_zone(glob, &si);
 383         if (unlikely(ret != 0))
 384                 goto out_no_zone;
 385 #else
 386         ret = ttm_mem_init_dma32_zone(glob, &si);
 387         if (unlikely(ret != 0))
 388                 goto out_no_zone;
 389 #endif
 390         for (i = 0; i < glob->num_zones; ++i) {
 391                 zone = glob->zones[i];
 392                 pr_info("Zone %7s: Available graphics memory: %llu kiB\n",
 393                         zone->name, (unsigned long long)zone->max_mem >> 10);
 394         }
 395         ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
 396         ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
 397         return 0;
 398 out_no_zone:
 399         ttm_mem_global_release(glob);
 400         return ret;
 401 }
 402 EXPORT_SYMBOL(ttm_mem_global_init);
 403
 404 void ttm_mem_global_release(struct ttm_mem_global *glob)
 405 {
 406         unsigned int i;
 407         struct ttm_mem_zone *zone;
 408
 409         /* let the page allocator first stop the shrink work. */
 410         ttm_page_alloc_fini();
 411         ttm_dma_page_alloc_fini();
 412
 413         flush_workqueue(glob->swap_queue);
 414         destroy_workqueue(glob->swap_queue);
 415         glob->swap_queue = NULL;
 416         for (i = 0; i < glob->num_zones; ++i) {
 417                 zone = glob->zones[i];
 418                 kobject_del(&zone->kobj);
 419                 kobject_put(&zone->kobj);
 420                         }
 421         kobject_del(&glob->kobj);
 422         kobject_put(&glob->kobj);
 423 }
 424 EXPORT_SYMBOL(ttm_mem_global_release);
 425
 426 static void ttm_check_swapping(struct ttm_mem_global *glob)
 427 {
 428         bool needs_swapping = false;
 429         unsigned int i;
 430         struct ttm_mem_zone *zone;
 431
 432         spin_lock(&glob->lock);
 433         for (i = 0; i < glob->num_zones; ++i) {
 434                 zone = glob->zones[i];
 435                 if (zone->used_mem > zone->swap_limit) {
 436                         needs_swapping = true;
 437                         break;
 438                 }
 439         }
 440
 441         spin_unlock(&glob->lock);
 442
 443         if (unlikely(needs_swapping))
 444                 (void)queue_work(glob->swap_queue, &glob->work);
 445
 446 }
 447
 448 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
 449                                      struct ttm_mem_zone *single_zone,
 450                                      uint64_t amount)
 451 {
 452         unsigned int i;
 453         struct ttm_mem_zone *zone;
 454
 455         spin_lock(&glob->lock);
 456         for (i = 0; i < glob->num_zones; ++i) {
 457                 zone = glob->zones[i];
 458                 if (single_zone && zone != single_zone)
 459                         continue;
 460                 zone->used_mem -= amount;
 461         }
 462         spin_unlock(&glob->lock);
 463 }
 464
 465 void ttm_mem_global_free(struct ttm_mem_global *glob,
 466                          uint64_t amount)
 467 {
 468         return ttm_mem_global_free_zone(glob, NULL, amount);
 469 }
 470 EXPORT_SYMBOL(ttm_mem_global_free);
 471
 472 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
 473                                   struct ttm_mem_zone *single_zone,
 474                                   uint64_t amount, bool reserve)
 475 {
 476         uint64_t limit;
 477         int ret = -ENOMEM;
 478         unsigned int i;
 479         struct ttm_mem_zone *zone;
 480
 481         spin_lock(&glob->lock);
 482         for (i = 0; i < glob->num_zones; ++i) {
 483                 zone = glob->zones[i];
 484                 if (single_zone && zone != single_zone)
 485                         continue;
 486
 487                 limit = (capable(CAP_SYS_ADMIN)) ?
 488                         zone->emer_mem : zone->max_mem;
 489
 490                 if (zone->used_mem > limit)
 491                         goto out_unlock;
 492         }
 493
 494         if (reserve) {
 495                 for (i = 0; i < glob->num_zones; ++i) {
 496                         zone = glob->zones[i];
 497                         if (single_zone && zone != single_zone)
 498                                 continue;
 499                         zone->used_mem += amount;
 500                 }
 501         }
 502
 503         ret = 0;
 504 out_unlock:
 505         spin_unlock(&glob->lock);
 506         ttm_check_swapping(glob);
 507
 508         return ret;
 509 }
 510
 511
 512 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
 513                                      struct ttm_mem_zone *single_zone,
 514                                      uint64_t memory,
 515                                      struct ttm_operation_ctx *ctx)
 516 {
 517         int count = TTM_MEMORY_ALLOC_RETRIES;
 518
 519         while (unlikely(ttm_mem_global_reserve(glob,
 520                                                single_zone,
 521                                                memory, true)
 522                         != 0)) {
 523                 if (ctx->no_wait_gpu)
 524                         return -ENOMEM;
 525                 if (unlikely(count-- == 0))
 526                         return -ENOMEM;
 527                 ttm_shrink(glob, false, memory + (memory >> 2) + 16, ctx);
 528         }
 529
 530         return 0;
 531 }
 532
 533 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 534                          struct ttm_operation_ctx *ctx)
 535 {
 536         /**
 537          * Normal allocations of kernel memory are registered in
 538          * all zones.
 539          */
 540
 541         return ttm_mem_global_alloc_zone(glob, NULL, memory, ctx);
 542 }
 543 EXPORT_SYMBOL(ttm_mem_global_alloc);
 544
 545 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
 546                               struct page *page, uint64_t size,
 547                               struct ttm_operation_ctx *ctx)
 548 {
 549         struct ttm_mem_zone *zone = NULL;
 550
 551         /**
 552          * Page allocations may be registed in a single zone
 553          * only if highmem or !dma32.
 554          */
 555
 556 #ifdef CONFIG_HIGHMEM
 557         if (PageHighMem(page) && glob->zone_highmem != NULL)
 558                 zone = glob->zone_highmem;
 559 #else
 560         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 561                 zone = glob->zone_kernel;
 562 #endif
 563         return ttm_mem_global_alloc_zone(glob, zone, size, ctx);
 564 }
 565
 566 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page,
 567                               uint64_t size)
 568 {
 569         struct ttm_mem_zone *zone = NULL;
 570
 571 #ifdef CONFIG_HIGHMEM
 572         if (PageHighMem(page) && glob->zone_highmem != NULL)
 573                 zone = glob->zone_highmem;
 574 #else
 575         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 576                 zone = glob->zone_kernel;
 577 #endif
 578         ttm_mem_global_free_zone(glob, zone, size);
 579 }
 580
 581 size_t ttm_round_pot(size_t size)
 582 {
 583         if ((size & (size - 1)) == 0)
 584                 return size;
 585         else if (size > PAGE_SIZE)
 586                 return PAGE_ALIGN(size);
 587         else {
 588                 size_t tmp_size = 4;
 589
 590                 while (tmp_size < size)
 591                         tmp_size <<= 1;
 592
 593                 return tmp_size;
 594         }
 595         return 0;
 596 }
 597 EXPORT_SYMBOL(ttm_round_pot);
 598
 599 uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob)
 600 {
 601         return glob->zone_kernel->max_mem;
 602 }
 603 EXPORT_SYMBOL(ttm_get_kernel_zone_memory_size);