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;
 278         uint64_t mem;
 279         int ret;
 280
 281         if (si->totalhigh == 0)
 282                 return 0;
 283
 284         zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 285         if (unlikely(!zone))
 286                 return -ENOMEM;
 287
 288         mem = si->totalram;
 289         mem *= si->mem_unit;
 290
 291         zone->name = "highmem";
 292         zone->zone_mem = mem;
 293         zone->max_mem = mem >> 1;
 294         zone->emer_mem = (mem >> 1) + (mem >> 2);
 295         zone->swap_limit = zone->max_mem - (mem >> 3);
 296         zone->used_mem = 0;
 297         zone->glob = glob;
 298         glob->zone_highmem = zone;
 299         kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
 300         ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
 301         if (unlikely(ret != 0)) {
 302                 kobject_put(&zone->kobj);
 303                 return ret;
 304         }
 305         glob->zones[glob->num_zones++] = zone;
 306         return 0;
 307 }
 308 #else
 309 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
 310                                    const struct sysinfo *si)
 311 {
 312         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 313         uint64_t mem;
 314         int ret;
 315
 316         if (unlikely(!zone))
 317                 return -ENOMEM;
 318
 319         mem = si->totalram;
 320         mem *= si->mem_unit;
 321
 322         /**
 323          * No special dma32 zone needed.
 324          */
 325
 326         if (mem <= ((uint64_t) 1ULL << 32)) {
 327                 kfree(zone);
 328                 return 0;
 329         }
 330
 331         /*
 332          * Limit max dma32 memory to 4GB for now
 333          * until we can figure out how big this
 334          * zone really is.
 335          */
 336
 337         mem = ((uint64_t) 1ULL << 32);
 338         zone->name = "dma32";
 339         zone->zone_mem = mem;
 340         zone->max_mem = mem >> 1;
 341         zone->emer_mem = (mem >> 1) + (mem >> 2);
 342         zone->swap_limit = zone->max_mem - (mem >> 3);
 343         zone->used_mem = 0;
 344         zone->glob = glob;
 345         glob->zone_dma32 = zone;
 346         kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
 347         ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
 348         if (unlikely(ret != 0)) {
 349                 kobject_put(&zone->kobj);
 350                 return ret;
 351         }
 352         glob->zones[glob->num_zones++] = zone;
 353         return 0;
 354 }
 355 #endif
 356
 357 int ttm_mem_global_init(struct ttm_mem_global *glob)
 358 {
 359         struct sysinfo si;
 360         int ret;
 361         int i;
 362         struct ttm_mem_zone *zone;
 363
 364         spin_lock_init(&glob->lock);
 365         glob->swap_queue = create_singlethread_workqueue("ttm_swap");
 366         INIT_WORK(&glob->work, ttm_shrink_work);
 367         init_waitqueue_head(&glob->queue);
 368         kobject_init(&glob->kobj, &ttm_mem_glob_kobj_type);
 369         ret = kobject_add(&glob->kobj,
 370                           ttm_get_kobj(),
 371                           "memory_accounting");
 372         if (unlikely(ret != 0)) {
 373                 kobject_put(&glob->kobj);
 374                 return ret;
 375         }
 376
 377         si_meminfo(&si);
 378
 379         ret = ttm_mem_init_kernel_zone(glob, &si);
 380         if (unlikely(ret != 0))
 381                 goto out_no_zone;
 382 #ifdef CONFIG_HIGHMEM
 383         ret = ttm_mem_init_highmem_zone(glob, &si);
 384         if (unlikely(ret != 0))
 385                 goto out_no_zone;
 386 #else
 387         ret = ttm_mem_init_dma32_zone(glob, &si);
 388         if (unlikely(ret != 0))
 389                 goto out_no_zone;
 390 #endif
 391         for (i = 0; i < glob->num_zones; ++i) {
 392                 zone = glob->zones[i];
 393                 printk(KERN_INFO TTM_PFX
 394                        "Zone %7s: Available graphics memory: %llu kiB.\n",
 395                        zone->name, (unsigned long long) zone->max_mem >> 10);
 396         }
 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         flush_workqueue(glob->swap_queue);
 410         destroy_workqueue(glob->swap_queue);
 411         glob->swap_queue = NULL;
 412         for (i = 0; i < glob->num_zones; ++i) {
 413                 zone = glob->zones[i];
 414                 kobject_del(&zone->kobj);
 415                 kobject_put(&zone->kobj);
 416         }
 417         kobject_del(&glob->kobj);
 418         kobject_put(&glob->kobj);
 419 }
 420 EXPORT_SYMBOL(ttm_mem_global_release);
 421
 422 static void ttm_check_swapping(struct ttm_mem_global *glob)
 423 {
 424         bool needs_swapping = false;
 425         unsigned int i;
 426         struct ttm_mem_zone *zone;
 427
 428         spin_lock(&glob->lock);
 429         for (i = 0; i < glob->num_zones; ++i) {
 430                 zone = glob->zones[i];
 431                 if (zone->used_mem > zone->swap_limit) {
 432                         needs_swapping = true;
 433                         break;
 434                 }
 435         }
 436
 437         spin_unlock(&glob->lock);
 438
 439         if (unlikely(needs_swapping))
 440                 (void)queue_work(glob->swap_queue, &glob->work);
 441
 442 }
 443
 444 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
 445                                      struct ttm_mem_zone *single_zone,
 446                                      uint64_t amount)
 447 {
 448         unsigned int i;
 449         struct ttm_mem_zone *zone;
 450
 451         spin_lock(&glob->lock);
 452         for (i = 0; i < glob->num_zones; ++i) {
 453                 zone = glob->zones[i];
 454                 if (single_zone && zone != single_zone)
 455                         continue;
 456                 zone->used_mem -= amount;
 457         }
 458         spin_unlock(&glob->lock);
 459 }
 460
 461 void ttm_mem_global_free(struct ttm_mem_global *glob,
 462                          uint64_t amount)
 463 {
 464         return ttm_mem_global_free_zone(glob, NULL, amount);
 465 }
 466 EXPORT_SYMBOL(ttm_mem_global_free);
 467
 468 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
 469                                   struct ttm_mem_zone *single_zone,
 470                                   uint64_t amount, bool reserve)
 471 {
 472         uint64_t limit;
 473         int ret = -ENOMEM;
 474         unsigned int i;
 475         struct ttm_mem_zone *zone;
 476
 477         spin_lock(&glob->lock);
 478         for (i = 0; i < glob->num_zones; ++i) {
 479                 zone = glob->zones[i];
 480                 if (single_zone && zone != single_zone)
 481                         continue;
 482
 483                 limit = (capable(CAP_SYS_ADMIN)) ?
 484                         zone->emer_mem : zone->max_mem;
 485
 486                 if (zone->used_mem > limit)
 487                         goto out_unlock;
 488         }
 489
 490         if (reserve) {
 491                 for (i = 0; i < glob->num_zones; ++i) {
 492                         zone = glob->zones[i];
 493                         if (single_zone && zone != single_zone)
 494                                 continue;
 495                         zone->used_mem += amount;
 496                 }
 497         }
 498
 499         ret = 0;
 500 out_unlock:
 501         spin_unlock(&glob->lock);
 502         ttm_check_swapping(glob);
 503
 504         return ret;
 505 }
 506
 507
 508 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
 509                                      struct ttm_mem_zone *single_zone,
 510                                      uint64_t memory,
 511                                      bool no_wait, bool interruptible)
 512 {
 513         int count = TTM_MEMORY_ALLOC_RETRIES;
 514
 515         while (unlikely(ttm_mem_global_reserve(glob,
 516                                                single_zone,
 517                                                memory, true)
 518                         != 0)) {
 519                 if (no_wait)
 520                         return -ENOMEM;
 521                 if (unlikely(count-- == 0))
 522                         return -ENOMEM;
 523                 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
 524         }
 525
 526         return 0;
 527 }
 528
 529 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 530                          bool no_wait, bool interruptible)
 531 {
 532         /**
 533          * Normal allocations of kernel memory are registered in
 534          * all zones.
 535          */
 536
 537         return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
 538                                          interruptible);
 539 }
 540 EXPORT_SYMBOL(ttm_mem_global_alloc);
 541
 542 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
 543                               struct page *page,
 544                               bool no_wait, bool interruptible)
 545 {
 546
 547         struct ttm_mem_zone *zone = NULL;
 548
 549         /**
 550          * Page allocations may be registed in a single zone
 551          * only if highmem or !dma32.
 552          */
 553
 554 #ifdef CONFIG_HIGHMEM
 555         if (PageHighMem(page) && glob->zone_highmem != NULL)
 556                 zone = glob->zone_highmem;
 557 #else
 558         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 559                 zone = glob->zone_kernel;
 560 #endif
 561         return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
 562                                          interruptible);
 563 }
 564
 565 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
 566 {
 567         struct ttm_mem_zone *zone = NULL;
 568
 569 #ifdef CONFIG_HIGHMEM
 570         if (PageHighMem(page) && glob->zone_highmem != NULL)
 571                 zone = glob->zone_highmem;
 572 #else
 573         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 574                 zone = glob->zone_kernel;
 575 #endif
 576         ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
 577 }
 578
 579
 580 size_t ttm_round_pot(size_t size)
 581 {
 582         if ((size & (size - 1)) == 0)
 583                 return size;
 584         else if (size > PAGE_SIZE)
 585                 return PAGE_ALIGN(size);
 586         else {
 587                 size_t tmp_size = 4;
 588
 589                 while (tmp_size < size)
 590                         tmp_size <<= 1;
 591
 592                 return tmp_size;
 593         }
 594         return 0;
 595 }
 596 EXPORT_SYMBOL(ttm_round_pot);