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 #include "ttm/ttm_memory.h"
  29 #include "ttm/ttm_module.h"
  30 #include <linux/spinlock.h>
  31 #include <linux/sched.h>
  32 #include <linux/wait.h>
  33 #include <linux/mm.h>
  34 #include <linux/module.h>
  35
  36 #define TTM_MEMORY_ALLOC_RETRIES 4
  37
  38 struct ttm_mem_zone {
  39         struct kobject kobj;
  40         struct ttm_mem_global *glob;
  41         const char *name;
  42         uint64_t zone_mem;
  43         uint64_t emer_mem;
  44         uint64_t max_mem;
  45         uint64_t swap_limit;
  46         uint64_t used_mem;
  47 };
  48
  49 static struct attribute ttm_mem_sys = {
  50         .name = "zone_memory",
  51         .mode = S_IRUGO
  52 };
  53 static struct attribute ttm_mem_emer = {
  54         .name = "emergency_memory",
  55         .mode = S_IRUGO | S_IWUSR
  56 };
  57 static struct attribute ttm_mem_max = {
  58         .name = "available_memory",
  59         .mode = S_IRUGO | S_IWUSR
  60 };
  61 static struct attribute ttm_mem_swap = {
  62         .name = "swap_limit",
  63         .mode = S_IRUGO | S_IWUSR
  64 };
  65 static struct attribute ttm_mem_used = {
  66         .name = "used_memory",
  67         .mode = S_IRUGO
  68 };
  69
  70 static void ttm_mem_zone_kobj_release(struct kobject *kobj)
  71 {
  72         struct ttm_mem_zone *zone =
  73                 container_of(kobj, struct ttm_mem_zone, kobj);
  74
  75         printk(KERN_INFO TTM_PFX
  76                "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 snprintf(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 = sscanf(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 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 (capable(CAP_SYS_ADMIN))
 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(struct work_struct *work)
 235 {
 236         struct ttm_mem_global *glob =
 237             container_of(work, struct ttm_mem_global, work);
 238
 239         ttm_shrink(glob, true, 0ULL);
 240 }
 241
 242 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
 243                                     const struct sysinfo *si)
 244 {
 245         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 246         uint64_t mem;
 247         int ret;
 248
 249         if (unlikely(!zone))
 250                 return -ENOMEM;
 251
 252         mem = si->totalram - si->totalhigh;
 253         mem *= si->mem_unit;
 254
 255         zone->name = "kernel";
 256         zone->zone_mem = mem;
 257         zone->max_mem = mem >> 1;
 258         zone->emer_mem = (mem >> 1) + (mem >> 2);
 259         zone->swap_limit = zone->max_mem - (mem >> 3);
 260         zone->used_mem = 0;
 261         zone->glob = glob;
 262         glob->zone_kernel = zone;
 263         kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
 264         ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
 265         if (unlikely(ret != 0)) {
 266                 kobject_put(&zone->kobj);
 267                 return ret;
 268         }
 269         glob->zones[glob->num_zones++] = zone;
 270         return 0;
 271 }
 272
 273 #ifdef CONFIG_HIGHMEM
 274 static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
 275                                      const struct sysinfo *si)
 276 {
 277         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 278         uint64_t mem;
 279         int ret;
 280
 281         if (unlikely(!zone))
 282                 return -ENOMEM;
 283
 284         if (si->totalhigh == 0)
 285                 return 0;
 286
 287         mem = si->totalram;
 288         mem *= si->mem_unit;
 289
 290         zone->name = "highmem";
 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_highmem = zone;
 298         kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
 299         ret = kobject_add(&zone->kobj, &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 #else
 308 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
 309                                    const struct sysinfo *si)
 310 {
 311         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 312         uint64_t mem;
 313         int ret;
 314
 315         if (unlikely(!zone))
 316                 return -ENOMEM;
 317
 318         mem = si->totalram;
 319         mem *= si->mem_unit;
 320
 321         /**
 322          * No special dma32 zone needed.
 323          */
 324
 325         if (mem <= ((uint64_t) 1ULL << 32))
 326                 return 0;
 327
 328         /*
 329          * Limit max dma32 memory to 4GB for now
 330          * until we can figure out how big this
 331          * zone really is.
 332          */
 333
 334         mem = ((uint64_t) 1ULL << 32);
 335         zone->name = "dma32";
 336         zone->zone_mem = mem;
 337         zone->max_mem = mem >> 1;
 338         zone->emer_mem = (mem >> 1) + (mem >> 2);
 339         zone->swap_limit = zone->max_mem - (mem >> 3);
 340         zone->used_mem = 0;
 341         zone->glob = glob;
 342         glob->zone_dma32 = zone;
 343         kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
 344         ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
 345         if (unlikely(ret != 0)) {
 346                 kobject_put(&zone->kobj);
 347                 return ret;
 348         }
 349         glob->zones[glob->num_zones++] = zone;
 350         return 0;
 351 }
 352 #endif
 353
 354 int ttm_mem_global_init(struct ttm_mem_global *glob)
 355 {
 356         struct sysinfo si;
 357         int ret;
 358         int i;
 359         struct ttm_mem_zone *zone;
 360
 361         spin_lock_init(&glob->lock);
 362         glob->swap_queue = create_singlethread_workqueue("ttm_swap");
 363         INIT_WORK(&glob->work, ttm_shrink_work);
 364         init_waitqueue_head(&glob->queue);
 365         kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type);
 366         ret = kobject_add(&glob->kobj,
 367                           ttm_get_kobj(),
 368                           "memory_accounting");
 369         if (unlikely(ret != 0)) {
 370                 kobject_put(&glob->kobj);
 371                 return ret;
 372         }
 373
 374         si_meminfo(&si);
 375
 376         ret = ttm_mem_init_kernel_zone(glob, &si);
 377         if (unlikely(ret != 0))
 378                 goto out_no_zone;
 379 #ifdef CONFIG_HIGHMEM
 380         ret = ttm_mem_init_highmem_zone(glob, &si);
 381         if (unlikely(ret != 0))
 382                 goto out_no_zone;
 383 #else
 384         ret = ttm_mem_init_dma32_zone(glob, &si);
 385         if (unlikely(ret != 0))
 386                 goto out_no_zone;
 387 #endif
 388         for (i = 0; i < glob->num_zones; ++i) {
 389                 zone = glob->zones[i];
 390                 printk(KERN_INFO TTM_PFX
 391                        "Zone %7s: Available graphics memory: %llu kiB.\n",
 392                        zone->name, (unsigned long long) zone->max_mem >> 10);
 393         }
 394         return 0;
 395 out_no_zone:
 396         ttm_mem_global_release(glob);
 397         return ret;
 398 }
 399 EXPORT_SYMBOL(ttm_mem_global_init);
 400
 401 void ttm_mem_global_release(struct ttm_mem_global *glob)
 402 {
 403         unsigned int i;
 404         struct ttm_mem_zone *zone;
 405
 406         flush_workqueue(glob->swap_queue);
 407         destroy_workqueue(glob->swap_queue);
 408         glob->swap_queue = NULL;
 409         for (i = 0; i < glob->num_zones; ++i) {
 410                 zone = glob->zones[i];
 411                 kobject_del(&zone->kobj);
 412                 kobject_put(&zone->kobj);
 413         }
 414         kobject_del(&glob->kobj);
 415         kobject_put(&glob->kobj);
 416 }
 417 EXPORT_SYMBOL(ttm_mem_global_release);
 418
 419 static void ttm_check_swapping(struct ttm_mem_global *glob)
 420 {
 421         bool needs_swapping = false;
 422         unsigned int i;
 423         struct ttm_mem_zone *zone;
 424
 425         spin_lock(&glob->lock);
 426         for (i = 0; i < glob->num_zones; ++i) {
 427                 zone = glob->zones[i];
 428                 if (zone->used_mem > zone->swap_limit) {
 429                         needs_swapping = true;
 430                         break;
 431                 }
 432         }
 433
 434         spin_unlock(&glob->lock);
 435
 436         if (unlikely(needs_swapping))
 437                 (void)queue_work(glob->swap_queue, &glob->work);
 438
 439 }
 440
 441 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
 442                                      struct ttm_mem_zone *single_zone,
 443                                      uint64_t amount)
 444 {
 445         unsigned int i;
 446         struct ttm_mem_zone *zone;
 447
 448         spin_lock(&glob->lock);
 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         spin_unlock(&glob->lock);
 456 }
 457
 458 void ttm_mem_global_free(struct ttm_mem_global *glob,
 459                          uint64_t amount)
 460 {
 461         return ttm_mem_global_free_zone(glob, NULL, amount);
 462 }
 463
 464 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
 465                                   struct ttm_mem_zone *single_zone,
 466                                   uint64_t amount, bool reserve)
 467 {
 468         uint64_t limit;
 469         int ret = -ENOMEM;
 470         unsigned int i;
 471         struct ttm_mem_zone *zone;
 472
 473         spin_lock(&glob->lock);
 474         for (i = 0; i < glob->num_zones; ++i) {
 475                 zone = glob->zones[i];
 476                 if (single_zone && zone != single_zone)
 477                         continue;
 478
 479                 limit = (capable(CAP_SYS_ADMIN)) ?
 480                         zone->emer_mem : zone->max_mem;
 481
 482                 if (zone->used_mem > limit)
 483                         goto out_unlock;
 484         }
 485
 486         if (reserve) {
 487                 for (i = 0; i < glob->num_zones; ++i) {
 488                         zone = glob->zones[i];
 489                         if (single_zone && zone != single_zone)
 490                                 continue;
 491                         zone->used_mem += amount;
 492                 }
 493         }
 494
 495         ret = 0;
 496 out_unlock:
 497         spin_unlock(&glob->lock);
 498         ttm_check_swapping(glob);
 499
 500         return ret;
 501 }
 502
 503
 504 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
 505                                      struct ttm_mem_zone *single_zone,
 506                                      uint64_t memory,
 507                                      bool no_wait, bool interruptible)
 508 {
 509         int count = TTM_MEMORY_ALLOC_RETRIES;
 510
 511         while (unlikely(ttm_mem_global_reserve(glob,
 512                                                single_zone,
 513                                                memory, true)
 514                         != 0)) {
 515                 if (no_wait)
 516                         return -ENOMEM;
 517                 if (unlikely(count-- == 0))
 518                         return -ENOMEM;
 519                 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
 520         }
 521
 522         return 0;
 523 }
 524
 525 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 526                          bool no_wait, bool interruptible)
 527 {
 528         /**
 529          * Normal allocations of kernel memory are registered in
 530          * all zones.
 531          */
 532
 533         return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
 534                                          interruptible);
 535 }
 536
 537 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
 538                               struct page *page,
 539                               bool no_wait, bool interruptible)
 540 {
 541
 542         struct ttm_mem_zone *zone = NULL;
 543
 544         /**
 545          * Page allocations may be registed in a single zone
 546          * only if highmem or !dma32.
 547          */
 548
 549 #ifdef CONFIG_HIGHMEM
 550         if (PageHighMem(page) && glob->zone_highmem != NULL)
 551                 zone = glob->zone_highmem;
 552 #else
 553         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 554                 zone = glob->zone_kernel;
 555 #endif
 556         return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
 557                                          interruptible);
 558 }
 559
 560 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
 561 {
 562         struct ttm_mem_zone *zone = NULL;
 563
 564 #ifdef CONFIG_HIGHMEM
 565         if (PageHighMem(page) && glob->zone_highmem != NULL)
 566                 zone = glob->zone_highmem;
 567 #else
 568         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 569                 zone = glob->zone_kernel;
 570 #endif
 571         ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
 572 }
 573
 574
 575 size_t ttm_round_pot(size_t size)
 576 {
 577         if ((size & (size - 1)) == 0)
 578                 return size;
 579         else if (size > PAGE_SIZE)
 580                 return PAGE_ALIGN(size);
 581         else {
 582                 size_t tmp_size = 4;
 583
 584                 while (tmp_size < size)
 585                         tmp_size <<= 1;
 586
 587                 return tmp_size;
 588         }
 589         return 0;
 590 }