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 #include <linux/slab.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         printk(KERN_INFO TTM_PFX
  77                "Zone %7s: Used memory at exit: %llu kiB.\n",
  78                zone->name, (unsigned long long) zone->used_mem >> 10);
  79         kfree(zone);
  80 }
  81
  82 static ssize_t ttm_mem_zone_show(struct kobject *kobj,
  83                                  struct attribute *attr,
  84                                  char *buffer)
  85 {
  86         struct ttm_mem_zone *zone =
  87                 container_of(kobj, struct ttm_mem_zone, kobj);
  88         uint64_t val = 0;
  89
  90         spin_lock(&zone->glob->lock);
  91         if (attr == &ttm_mem_sys)
  92                 val = zone->zone_mem;
  93         else if (attr == &ttm_mem_emer)
  94                 val = zone->emer_mem;
  95         else if (attr == &ttm_mem_max)
  96                 val = zone->max_mem;
  97         else if (attr == &ttm_mem_swap)
  98                 val = zone->swap_limit;
  99         else if (attr == &ttm_mem_used)
 100                 val = zone->used_mem;
 101         spin_unlock(&zone->glob->lock);
 102
 103         return snprintf(buffer, PAGE_SIZE, "%llu\n",
 104                         (unsigned long long) val >> 10);
 105 }
 106
 107 static void ttm_check_swapping(struct ttm_mem_global *glob);
 108
 109 static ssize_t ttm_mem_zone_store(struct kobject *kobj,
 110                                   struct attribute *attr,
 111                                   const char *buffer,
 112                                   size_t size)
 113 {
 114         struct ttm_mem_zone *zone =
 115                 container_of(kobj, struct ttm_mem_zone, kobj);
 116         int chars;
 117         unsigned long val;
 118         uint64_t val64;
 119
 120         chars = sscanf(buffer, "%lu", &val);
 121         if (chars == 0)
 122                 return size;
 123
 124         val64 = val;
 125         val64 <<= 10;
 126
 127         spin_lock(&zone->glob->lock);
 128         if (val64 > zone->zone_mem)
 129                 val64 = zone->zone_mem;
 130         if (attr == &ttm_mem_emer) {
 131                 zone->emer_mem = val64;
 132                 if (zone->max_mem > val64)
 133                         zone->max_mem = val64;
 134         } else if (attr == &ttm_mem_max) {
 135                 zone->max_mem = val64;
 136                 if (zone->emer_mem < val64)
 137                         zone->emer_mem = val64;
 138         } else if (attr == &ttm_mem_swap)
 139                 zone->swap_limit = val64;
 140         spin_unlock(&zone->glob->lock);
 141
 142         ttm_check_swapping(zone->glob);
 143
 144         return size;
 145 }
 146
 147 static struct attribute *ttm_mem_zone_attrs[] = {
 148         &ttm_mem_sys,
 149         &ttm_mem_emer,
 150         &ttm_mem_max,
 151         &ttm_mem_swap,
 152         &ttm_mem_used,
 153         NULL
 154 };
 155
 156 static const struct sysfs_ops ttm_mem_zone_ops = {
 157         .show = &ttm_mem_zone_show,
 158         .store = &ttm_mem_zone_store
 159 };
 160
 161 static struct kobj_type ttm_mem_zone_kobj_type = {
 162         .release = &ttm_mem_zone_kobj_release,
 163         .sysfs_ops = &ttm_mem_zone_ops,
 164         .default_attrs = ttm_mem_zone_attrs,
 165 };
 166
 167 static void ttm_mem_global_kobj_release(struct kobject *kobj)
 168 {
 169         struct ttm_mem_global *glob =
 170                 container_of(kobj, struct ttm_mem_global, kobj);
 171
 172         kfree(glob);
 173 }
 174
 175 static struct kobj_type ttm_mem_glob_kobj_type = {
 176         .release = &ttm_mem_global_kobj_release,
 177 };
 178
 179 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
 180                                         bool from_wq, uint64_t extra)
 181 {
 182         unsigned int i;
 183         struct ttm_mem_zone *zone;
 184         uint64_t target;
 185
 186         for (i = 0; i < glob->num_zones; ++i) {
 187                 zone = glob->zones[i];
 188
 189                 if (from_wq)
 190                         target = zone->swap_limit;
 191                 else if (capable(CAP_SYS_ADMIN))
 192                         target = zone->emer_mem;
 193                 else
 194                         target = zone->max_mem;
 195
 196                 target = (extra > target) ? 0ULL : target;
 197
 198                 if (zone->used_mem > target)
 199                         return true;
 200         }
 201         return false;
 202 }
 203
 204 /**
 205  * At this point we only support a single shrink callback.
 206  * Extend this if needed, perhaps using a linked list of callbacks.
 207  * Note that this function is reentrant:
 208  * many threads may try to swap out at any given time.
 209  */
 210
 211 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
 212                        uint64_t extra)
 213 {
 214         int ret;
 215         struct ttm_mem_shrink *shrink;
 216
 217         spin_lock(&glob->lock);
 218         if (glob->shrink == NULL)
 219                 goto out;
 220
 221         while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
 222                 shrink = glob->shrink;
 223                 spin_unlock(&glob->lock);
 224                 ret = shrink->do_shrink(shrink);
 225                 spin_lock(&glob->lock);
 226                 if (unlikely(ret != 0))
 227                         goto out;
 228         }
 229 out:
 230         spin_unlock(&glob->lock);
 231 }
 232
 233
 234
 235 static void ttm_shrink_work(struct work_struct *work)
 236 {
 237         struct ttm_mem_global *glob =
 238             container_of(work, struct ttm_mem_global, work);
 239
 240         ttm_shrink(glob, true, 0ULL);
 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, zone->name);
 302         if (unlikely(ret != 0)) {
 303                 kobject_put(&zone->kobj);
 304                 return ret;
 305         }
 306         glob->zones[glob->num_zones++] = zone;
 307         return 0;
 308 }
 309 #else
 310 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
 311                                    const struct sysinfo *si)
 312 {
 313         struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 314         uint64_t mem;
 315         int ret;
 316
 317         if (unlikely(!zone))
 318                 return -ENOMEM;
 319
 320         mem = si->totalram;
 321         mem *= si->mem_unit;
 322
 323         /**
 324          * No special dma32 zone needed.
 325          */
 326
 327         if (mem <= ((uint64_t) 1ULL << 32)) {
 328                 kfree(zone);
 329                 return 0;
 330         }
 331
 332         /*
 333          * Limit max dma32 memory to 4GB for now
 334          * until we can figure out how big this
 335          * zone really is.
 336          */
 337
 338         mem = ((uint64_t) 1ULL << 32);
 339         zone->name = "dma32";
 340         zone->zone_mem = mem;
 341         zone->max_mem = mem >> 1;
 342         zone->emer_mem = (mem >> 1) + (mem >> 2);
 343         zone->swap_limit = zone->max_mem - (mem >> 3);
 344         zone->used_mem = 0;
 345         zone->glob = glob;
 346         glob->zone_dma32 = zone;
 347         ret = kobject_init_and_add(
 348                 &zone->kobj, &ttm_mem_zone_kobj_type, &glob->kobj, zone->name);
 349         if (unlikely(ret != 0)) {
 350                 kobject_put(&zone->kobj);
 351                 return ret;
 352         }
 353         glob->zones[glob->num_zones++] = zone;
 354         return 0;
 355 }
 356 #endif
 357
 358 int ttm_mem_global_init(struct ttm_mem_global *glob)
 359 {
 360         struct sysinfo si;
 361         int ret;
 362         int i;
 363         struct ttm_mem_zone *zone;
 364
 365         spin_lock_init(&glob->lock);
 366         glob->swap_queue = create_singlethread_workqueue("ttm_swap");
 367         INIT_WORK(&glob->work, ttm_shrink_work);
 368         init_waitqueue_head(&glob->queue);
 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                 printk(KERN_INFO TTM_PFX
 393                        "Zone %7s: Available graphics memory: %llu kiB.\n",
 394                        zone->name, (unsigned long long) zone->max_mem >> 10);
 395         }
 396         return 0;
 397 out_no_zone:
 398         ttm_mem_global_release(glob);
 399         return ret;
 400 }
 401 EXPORT_SYMBOL(ttm_mem_global_init);
 402
 403 void ttm_mem_global_release(struct ttm_mem_global *glob)
 404 {
 405         unsigned int i;
 406         struct ttm_mem_zone *zone;
 407
 408         flush_workqueue(glob->swap_queue);
 409         destroy_workqueue(glob->swap_queue);
 410         glob->swap_queue = NULL;
 411         for (i = 0; i < glob->num_zones; ++i) {
 412                 zone = glob->zones[i];
 413                 kobject_del(&zone->kobj);
 414                 kobject_put(&zone->kobj);
 415         }
 416         kobject_del(&glob->kobj);
 417         kobject_put(&glob->kobj);
 418 }
 419 EXPORT_SYMBOL(ttm_mem_global_release);
 420
 421 static void ttm_check_swapping(struct ttm_mem_global *glob)
 422 {
 423         bool needs_swapping = false;
 424         unsigned int i;
 425         struct ttm_mem_zone *zone;
 426
 427         spin_lock(&glob->lock);
 428         for (i = 0; i < glob->num_zones; ++i) {
 429                 zone = glob->zones[i];
 430                 if (zone->used_mem > zone->swap_limit) {
 431                         needs_swapping = true;
 432                         break;
 433                 }
 434         }
 435
 436         spin_unlock(&glob->lock);
 437
 438         if (unlikely(needs_swapping))
 439                 (void)queue_work(glob->swap_queue, &glob->work);
 440
 441 }
 442
 443 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
 444                                      struct ttm_mem_zone *single_zone,
 445                                      uint64_t amount)
 446 {
 447         unsigned int i;
 448         struct ttm_mem_zone *zone;
 449
 450         spin_lock(&glob->lock);
 451         for (i = 0; i < glob->num_zones; ++i) {
 452                 zone = glob->zones[i];
 453                 if (single_zone && zone != single_zone)
 454                         continue;
 455                 zone->used_mem -= amount;
 456         }
 457         spin_unlock(&glob->lock);
 458 }
 459
 460 void ttm_mem_global_free(struct ttm_mem_global *glob,
 461                          uint64_t amount)
 462 {
 463         return ttm_mem_global_free_zone(glob, NULL, amount);
 464 }
 465 EXPORT_SYMBOL(ttm_mem_global_free);
 466
 467 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
 468                                   struct ttm_mem_zone *single_zone,
 469                                   uint64_t amount, bool reserve)
 470 {
 471         uint64_t limit;
 472         int ret = -ENOMEM;
 473         unsigned int i;
 474         struct ttm_mem_zone *zone;
 475
 476         spin_lock(&glob->lock);
 477         for (i = 0; i < glob->num_zones; ++i) {
 478                 zone = glob->zones[i];
 479                 if (single_zone && zone != single_zone)
 480                         continue;
 481
 482                 limit = (capable(CAP_SYS_ADMIN)) ?
 483                         zone->emer_mem : zone->max_mem;
 484
 485                 if (zone->used_mem > limit)
 486                         goto out_unlock;
 487         }
 488
 489         if (reserve) {
 490                 for (i = 0; i < glob->num_zones; ++i) {
 491                         zone = glob->zones[i];
 492                         if (single_zone && zone != single_zone)
 493                                 continue;
 494                         zone->used_mem += amount;
 495                 }
 496         }
 497
 498         ret = 0;
 499 out_unlock:
 500         spin_unlock(&glob->lock);
 501         ttm_check_swapping(glob);
 502
 503         return ret;
 504 }
 505
 506
 507 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
 508                                      struct ttm_mem_zone *single_zone,
 509                                      uint64_t memory,
 510                                      bool no_wait, bool interruptible)
 511 {
 512         int count = TTM_MEMORY_ALLOC_RETRIES;
 513
 514         while (unlikely(ttm_mem_global_reserve(glob,
 515                                                single_zone,
 516                                                memory, true)
 517                         != 0)) {
 518                 if (no_wait)
 519                         return -ENOMEM;
 520                 if (unlikely(count-- == 0))
 521                         return -ENOMEM;
 522                 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
 523         }
 524
 525         return 0;
 526 }
 527
 528 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 529                          bool no_wait, bool interruptible)
 530 {
 531         /**
 532          * Normal allocations of kernel memory are registered in
 533          * all zones.
 534          */
 535
 536         return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
 537                                          interruptible);
 538 }
 539 EXPORT_SYMBOL(ttm_mem_global_alloc);
 540
 541 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
 542                               struct page *page,
 543                               bool no_wait, bool interruptible)
 544 {
 545
 546         struct ttm_mem_zone *zone = NULL;
 547
 548         /**
 549          * Page allocations may be registed in a single zone
 550          * only if highmem or !dma32.
 551          */
 552
 553 #ifdef CONFIG_HIGHMEM
 554         if (PageHighMem(page) && glob->zone_highmem != NULL)
 555                 zone = glob->zone_highmem;
 556 #else
 557         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 558                 zone = glob->zone_kernel;
 559 #endif
 560         return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
 561                                          interruptible);
 562 }
 563
 564 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
 565 {
 566         struct ttm_mem_zone *zone = NULL;
 567
 568 #ifdef CONFIG_HIGHMEM
 569         if (PageHighMem(page) && glob->zone_highmem != NULL)
 570                 zone = glob->zone_highmem;
 571 #else
 572         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 573                 zone = glob->zone_kernel;
 574 #endif
 575         ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
 576 }
 577
 578
 579 size_t ttm_round_pot(size_t size)
 580 {
 581         if ((size & (size - 1)) == 0)
 582                 return size;
 583         else if (size > PAGE_SIZE)
 584                 return PAGE_ALIGN(size);
 585         else {
 586                 size_t tmp_size = 4;
 587
 588                 while (tmp_size < size)
 589                         tmp_size <<= 1;
 590
 591                 return tmp_size;
 592         }
 593         return 0;
 594 }
 595 EXPORT_SYMBOL(ttm_round_pot);