sys/dev/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  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_memory.c 248663 2013-03-23 20:46:47Z dumbbell $
  27  **************************************************************************/
  28
  29 #define pr_fmt(fmt) "[TTM] " fmt
  30
  31 #include <drm/drmP.h>
  32 #include <drm/ttm/ttm_memory.h>
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_page_alloc.h>
  35 #include <linux/export.h>
  36
  37 #define TTM_MEMORY_ALLOC_RETRIES 4
  38
  39 struct ttm_mem_zone {
  40         u_int kobj_ref;
  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 void ttm_mem_zone_kobj_release(struct ttm_mem_zone *zone)
  51 {
  52
  53         pr_info("Zone %7s: Used memory at exit: %llu kiB\n",
  54                 zone->name, (unsigned long long)zone->used_mem >> 10);
  55         kfree(zone);
  56 }
  57
  58 #if 0
  59 /* XXXKIB sysctl */
  60 static ssize_t ttm_mem_zone_show(struct ttm_mem_zone *zone;
  61                                  struct attribute *attr,
  62                                  char *buffer)
  63 {
  64         uint64_t val = 0;
  65
  66         mtx_lock(&zone->glob->lock);
  67         if (attr == &ttm_mem_sys)
  68                 val = zone->zone_mem;
  69         else if (attr == &ttm_mem_emer)
  70                 val = zone->emer_mem;
  71         else if (attr == &ttm_mem_max)
  72                 val = zone->max_mem;
  73         else if (attr == &ttm_mem_swap)
  74                 val = zone->swap_limit;
  75         else if (attr == &ttm_mem_used)
  76                 val = zone->used_mem;
  77         mtx_unlock(&zone->glob->lock);
  78
  79         return snprintf(buffer, PAGE_SIZE, "%llu\n",
  80                         (unsigned long long) val >> 10);
  81 }
  82 #endif
  83
  84 static void ttm_check_swapping(struct ttm_mem_global *glob);
  85
  86 #if 0
  87 /* XXXKIB sysctl */
  88 static ssize_t ttm_mem_zone_store(struct ttm_mem_zone *zone,
  89                                   struct attribute *attr,
  90                                   const char *buffer,
  91                                   size_t size)
  92 {
  93         int chars;
  94         unsigned long val;
  95         uint64_t val64;
  96
  97         chars = sscanf(buffer, "%lu", &val);
  98         if (chars == 0)
  99                 return size;
 100
 101         val64 = val;
 102         val64 <<= 10;
 103
 104         mtx_lock(&zone->glob->lock);
 105         if (val64 > zone->zone_mem)
 106                 val64 = zone->zone_mem;
 107         if (attr == &ttm_mem_emer) {
 108                 zone->emer_mem = val64;
 109                 if (zone->max_mem > val64)
 110                         zone->max_mem = val64;
 111         } else if (attr == &ttm_mem_max) {
 112                 zone->max_mem = val64;
 113                 if (zone->emer_mem < val64)
 114                         zone->emer_mem = val64;
 115         } else if (attr == &ttm_mem_swap)
 116                 zone->swap_limit = val64;
 117         mtx_unlock(&zone->glob->lock);
 118
 119         ttm_check_swapping(zone->glob);
 120
 121         return size;
 122 }
 123 #endif
 124
 125 static void ttm_mem_global_kobj_release(struct ttm_mem_global *glob)
 126 {
 127 }
 128
 129 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
 130                                         bool from_wq, uint64_t extra)
 131 {
 132         unsigned int i;
 133         struct ttm_mem_zone *zone;
 134         uint64_t target;
 135
 136         for (i = 0; i < glob->num_zones; ++i) {
 137                 zone = glob->zones[i];
 138
 139                 if (from_wq)
 140                         target = zone->swap_limit;
 141                 else if (priv_check(curthread, PRIV_VM_MLOCK) == 0)
 142                         target = zone->emer_mem;
 143                 else
 144                         target = zone->max_mem;
 145
 146                 target = (extra > target) ? 0ULL : target;
 147
 148                 if (zone->used_mem > target)
 149                         return true;
 150         }
 151         return false;
 152 }
 153
 154 /**
 155  * At this point we only support a single shrink callback.
 156  * Extend this if needed, perhaps using a linked list of callbacks.
 157  * Note that this function is reentrant:
 158  * many threads may try to swap out at any given time.
 159  */
 160
 161 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
 162                        uint64_t extra)
 163 {
 164         int ret;
 165         struct ttm_mem_shrink *shrink;
 166
 167         spin_lock(&glob->spin);
 168         if (glob->shrink == NULL)
 169                 goto out;
 170
 171         while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
 172                 shrink = glob->shrink;
 173                 spin_unlock(&glob->spin);
 174                 ret = shrink->do_shrink(shrink);
 175                 spin_lock(&glob->spin);
 176                 if (unlikely(ret != 0))
 177                         goto out;
 178         }
 179 out:
 180         spin_unlock(&glob->spin);
 181 }
 182
 183
 184
 185 static void ttm_shrink_work(void *arg, int pending __unused)
 186 {
 187         struct ttm_mem_global *glob = arg;
 188
 189         ttm_shrink(glob, true, 0ULL);
 190 }
 191
 192 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
 193     uint64_t mem)
 194 {
 195         struct ttm_mem_zone *zone;
 196
 197         zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 198
 199         zone->name = "kernel";
 200         zone->zone_mem = mem;
 201         zone->max_mem = mem >> 1;
 202         zone->emer_mem = (mem >> 1) + (mem >> 2);
 203         zone->swap_limit = zone->max_mem - (mem >> 3);
 204         zone->used_mem = 0;
 205         zone->glob = glob;
 206         glob->zone_kernel = zone;
 207         refcount_init(&zone->kobj_ref, 1);
 208         glob->zones[glob->num_zones++] = zone;
 209         return 0;
 210 }
 211
 212 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
 213     uint64_t mem)
 214 {
 215         struct ttm_mem_zone *zone;
 216
 217         zone = kzalloc(sizeof(*zone), GFP_KERNEL);
 218
 219         /**
 220          * No special dma32 zone needed.
 221          */
 222
 223         if ((physmem * PAGE_SIZE) <= ((uint64_t) 1ULL << 32)) {
 224                 kfree(zone);
 225                 return 0;
 226         }
 227
 228         /*
 229          * Limit max dma32 memory to 4GB for now
 230          * until we can figure out how big this
 231          * zone really is.
 232          */
 233         if (mem > ((uint64_t) 1ULL << 32))
 234                 mem = ((uint64_t) 1ULL << 32);
 235
 236         zone->name = "dma32";
 237         zone->zone_mem = mem;
 238         zone->max_mem = mem >> 1;
 239         zone->emer_mem = (mem >> 1) + (mem >> 2);
 240         zone->swap_limit = zone->max_mem - (mem >> 3);
 241         zone->used_mem = 0;
 242         zone->glob = glob;
 243         glob->zone_dma32 = zone;
 244         refcount_init(&zone->kobj_ref, 1);
 245         glob->zones[glob->num_zones++] = zone;
 246         return 0;
 247 }
 248
 249 int ttm_mem_global_init(struct ttm_mem_global *glob)
 250 {
 251         u_int64_t mem;
 252         int ret;
 253         int i;
 254         struct ttm_mem_zone *zone;
 255
 256         spin_init(&glob->spin, "ttmemglob");
 257         glob->swap_queue = taskqueue_create("ttm_swap", M_WAITOK,
 258             taskqueue_thread_enqueue, &glob->swap_queue);
 259         taskqueue_start_threads(&glob->swap_queue, 1, TDPRI_KERN_DAEMON,
 260                                 -1, "ttm swap");
 261         TASK_INIT(&glob->work, 0, ttm_shrink_work, glob);
 262
 263         refcount_init(&glob->kobj_ref, 1);
 264
 265         /*
 266          * Managed contiguous memory for TTM.  Only use kernel-reserved
 267          * dma memory for TTM, which can be controlled via /boot/loader.conf
 268          * (e.g. vm.dma_reserved=256m).  This is the only truly dependable
 269          * DMA memory.
 270          */
 271         mem = (uint64_t)vm_contig_avail_pages() * PAGE_SIZE;
 272
 273         ret = ttm_mem_init_kernel_zone(glob, mem);
 274         if (unlikely(ret != 0))
 275                 goto out_no_zone;
 276         ret = ttm_mem_init_dma32_zone(glob, mem);
 277         if (unlikely(ret != 0))
 278                 goto out_no_zone;
 279         pr_info("(struct ttm_mem_global *)%p\n", glob);
 280         for (i = 0; i < glob->num_zones; ++i) {
 281                 zone = glob->zones[i];
 282                 pr_info("Zone %7s: Available graphics memory: %llu kiB\n",
 283                         zone->name, (unsigned long long)zone->max_mem >> 10);
 284         }
 285         ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
 286         ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
 287         return 0;
 288 out_no_zone:
 289         ttm_mem_global_release(glob);
 290         return ret;
 291 }
 292 EXPORT_SYMBOL(ttm_mem_global_init);
 293
 294 void ttm_mem_global_release(struct ttm_mem_global *glob)
 295 {
 296         unsigned int i;
 297         struct ttm_mem_zone *zone;
 298
 299         /* let the page allocator first stop the shrink work. */
 300         ttm_page_alloc_fini();
 301         ttm_dma_page_alloc_fini();
 302
 303         taskqueue_drain(glob->swap_queue, &glob->work);
 304         taskqueue_free(glob->swap_queue);
 305         glob->swap_queue = NULL;
 306         for (i = 0; i < glob->num_zones; ++i) {
 307                 zone = glob->zones[i];
 308                 if (refcount_release(&zone->kobj_ref))
 309                         ttm_mem_zone_kobj_release(zone);
 310         }
 311         if (refcount_release(&glob->kobj_ref))
 312                 ttm_mem_global_kobj_release(glob);
 313 }
 314 EXPORT_SYMBOL(ttm_mem_global_release);
 315
 316 static void ttm_check_swapping(struct ttm_mem_global *glob)
 317 {
 318         bool needs_swapping = false;
 319         unsigned int i;
 320         struct ttm_mem_zone *zone;
 321
 322         spin_lock(&glob->spin);
 323         for (i = 0; i < glob->num_zones; ++i) {
 324                 zone = glob->zones[i];
 325                 if (zone->used_mem > zone->swap_limit) {
 326                         needs_swapping = true;
 327                         break;
 328                 }
 329         }
 330         spin_unlock(&glob->spin);
 331
 332         if (unlikely(needs_swapping))
 333                 taskqueue_enqueue(glob->swap_queue, &glob->work);
 334
 335 }
 336
 337 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
 338                                      struct ttm_mem_zone *single_zone,
 339                                      uint64_t amount)
 340 {
 341         unsigned int i;
 342         struct ttm_mem_zone *zone;
 343
 344         spin_lock(&glob->spin);
 345         for (i = 0; i < glob->num_zones; ++i) {
 346                 zone = glob->zones[i];
 347                 if (single_zone && zone != single_zone)
 348                         continue;
 349                 zone->used_mem -= amount;
 350         }
 351         spin_unlock(&glob->spin);
 352 }
 353
 354 void ttm_mem_global_free(struct ttm_mem_global *glob,
 355                          uint64_t amount)
 356 {
 357         ttm_mem_global_free_zone(glob, NULL, amount);
 358 }
 359 EXPORT_SYMBOL(ttm_mem_global_free);
 360
 361 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
 362                                   struct ttm_mem_zone *single_zone,
 363                                   uint64_t amount, bool reserve)
 364 {
 365         uint64_t limit;
 366         int ret = -ENOMEM;
 367         unsigned int i;
 368         struct ttm_mem_zone *zone;
 369
 370         spin_lock(&glob->spin);
 371         for (i = 0; i < glob->num_zones; ++i) {
 372                 zone = glob->zones[i];
 373                 if (single_zone && zone != single_zone)
 374                         continue;
 375
 376                 limit = (priv_check(curthread, PRIV_VM_MLOCK) == 0) ?
 377                         zone->emer_mem : zone->max_mem;
 378
 379                 if (zone->used_mem > limit)
 380                         goto out_unlock;
 381         }
 382
 383         if (reserve) {
 384                 for (i = 0; i < glob->num_zones; ++i) {
 385                         zone = glob->zones[i];
 386                         if (single_zone && zone != single_zone)
 387                                 continue;
 388                         zone->used_mem += amount;
 389                 }
 390         }
 391
 392         ret = 0;
 393 out_unlock:
 394         spin_unlock(&glob->spin);
 395         ttm_check_swapping(glob);
 396
 397         return ret;
 398 }
 399
 400
 401 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
 402                                      struct ttm_mem_zone *single_zone,
 403                                      uint64_t memory,
 404                                      bool no_wait, bool interruptible)
 405 {
 406         int count = TTM_MEMORY_ALLOC_RETRIES;
 407
 408         while (unlikely(ttm_mem_global_reserve(glob,
 409                                                single_zone,
 410                                                memory, true)
 411                         != 0)) {
 412                 if (no_wait)
 413                         return -ENOMEM;
 414                 if (unlikely(count-- == 0))
 415                         return -ENOMEM;
 416                 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
 417         }
 418
 419         return 0;
 420 }
 421
 422 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 423                          bool no_wait, bool interruptible)
 424 {
 425         /**
 426          * Normal allocations of kernel memory are registered in
 427          * all zones.
 428          */
 429
 430         return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
 431                                          interruptible);
 432 }
 433 EXPORT_SYMBOL(ttm_mem_global_alloc);
 434
 435 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
 436                               struct page *page,
 437                               bool no_wait, bool interruptible)
 438 {
 439
 440         struct ttm_mem_zone *zone = NULL;
 441
 442         /**
 443          * Page allocations may be registed in a single zone
 444          * only if highmem or !dma32.
 445          */
 446
 447         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 448                 zone = glob->zone_kernel;
 449         return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
 450                                          interruptible);
 451 }
 452
 453 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct page *page)
 454 {
 455         struct ttm_mem_zone *zone = NULL;
 456
 457         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
 458                 zone = glob->zone_kernel;
 459         ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
 460 }
 461
 462
 463 size_t ttm_round_pot(size_t size)
 464 {
 465         if ((size & (size - 1)) == 0)
 466                 return size;
 467         else if (size > PAGE_SIZE)
 468                 return PAGE_ALIGN(size);
 469         else {
 470                 size_t tmp_size = 4;
 471
 472                 while (tmp_size < size)
 473                         tmp_size <<= 1;
 474
 475                 return tmp_size;
 476         }
 477         return 0;
 478 }
 479 EXPORT_SYMBOL(ttm_round_pot);