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