ttm_memory.c

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    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 <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include <dev/drm2/drmP.h>
   32 #include <dev/drm2/ttm/ttm_memory.h>
   33 #include <dev/drm2/ttm/ttm_module.h>
   34 #include <dev/drm2/ttm/ttm_page_alloc.h>
   35 
   36 #define TTM_MEMORY_ALLOC_RETRIES 4
   37 
   38 struct ttm_mem_zone {
   39         u_int kobj_ref;
   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 MALLOC_DEFINE(M_TTM_ZONE, "ttm_zone", "TTM Zone");
   50 
   51 static void ttm_mem_zone_kobj_release(struct ttm_mem_zone *zone)
   52 {
   53 
   54         printf("[TTM] Zone %7s: Used memory at exit: %llu kiB\n",
   55                 zone->name, (unsigned long long)zone->used_mem >> 10);
   56         free(zone, M_TTM_ZONE);
   57 }
   58 
   59 #if 0
   60 /* XXXKIB sysctl */
   61 static ssize_t ttm_mem_zone_show(struct ttm_mem_zone *zone;
   62                                  struct attribute *attr,
   63                                  char *buffer)
   64 {
   65         uint64_t val = 0;
   66 
   67         mtx_lock(&zone->glob->lock);
   68         if (attr == &ttm_mem_sys)
   69                 val = zone->zone_mem;
   70         else if (attr == &ttm_mem_emer)
   71                 val = zone->emer_mem;
   72         else if (attr == &ttm_mem_max)
   73                 val = zone->max_mem;
   74         else if (attr == &ttm_mem_swap)
   75                 val = zone->swap_limit;
   76         else if (attr == &ttm_mem_used)
   77                 val = zone->used_mem;
   78         mtx_unlock(&zone->glob->lock);
   79 
   80         return snprintf(buffer, PAGE_SIZE, "%llu\n",
   81                         (unsigned long long) val >> 10);
   82 }
   83 #endif
   84 
   85 static void ttm_check_swapping(struct ttm_mem_global *glob);
   86 
   87 #if 0
   88 /* XXXKIB sysctl */
   89 static ssize_t ttm_mem_zone_store(struct ttm_mem_zone *zone,
   90                                   struct attribute *attr,
   91                                   const char *buffer,
   92                                   size_t size)
   93 {
   94         int chars;
   95         unsigned long val;
   96         uint64_t val64;
   97 
   98         chars = sscanf(buffer, "%lu", &val);
   99         if (chars == 0)
  100                 return size;
  101 
  102         val64 = val;
  103         val64 <<= 10;
  104 
  105         mtx_lock(&zone->glob->lock);
  106         if (val64 > zone->zone_mem)
  107                 val64 = zone->zone_mem;
  108         if (attr == &ttm_mem_emer) {
  109                 zone->emer_mem = val64;
  110                 if (zone->max_mem > val64)
  111                         zone->max_mem = val64;
  112         } else if (attr == &ttm_mem_max) {
  113                 zone->max_mem = val64;
  114                 if (zone->emer_mem < val64)
  115                         zone->emer_mem = val64;
  116         } else if (attr == &ttm_mem_swap)
  117                 zone->swap_limit = val64;
  118         mtx_unlock(&zone->glob->lock);
  119 
  120         ttm_check_swapping(zone->glob);
  121 
  122         return size;
  123 }
  124 #endif
  125 
  126 static void ttm_mem_global_kobj_release(struct ttm_mem_global *glob)
  127 {
  128 }
  129 
  130 static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
  131                                         bool from_wq, uint64_t extra)
  132 {
  133         unsigned int i;
  134         struct ttm_mem_zone *zone;
  135         uint64_t target;
  136 
  137         for (i = 0; i < glob->num_zones; ++i) {
  138                 zone = glob->zones[i];
  139 
  140                 if (from_wq)
  141                         target = zone->swap_limit;
  142                 else if (priv_check(curthread, PRIV_VM_MLOCK) == 0)
  143                         target = zone->emer_mem;
  144                 else
  145                         target = zone->max_mem;
  146 
  147                 target = (extra > target) ? 0ULL : target;
  148 
  149                 if (zone->used_mem > target)
  150                         return true;
  151         }
  152         return false;
  153 }
  154 
  155 /**
  156  * At this point we only support a single shrink callback.
  157  * Extend this if needed, perhaps using a linked list of callbacks.
  158  * Note that this function is reentrant:
  159  * many threads may try to swap out at any given time.
  160  */
  161 
  162 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
  163                        uint64_t extra)
  164 {
  165         int ret;
  166         struct ttm_mem_shrink *shrink;
  167 
  168         mtx_lock(&glob->lock);
  169         if (glob->shrink == NULL)
  170                 goto out;
  171 
  172         while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
  173                 shrink = glob->shrink;
  174                 mtx_unlock(&glob->lock);
  175                 ret = shrink->do_shrink(shrink);
  176                 mtx_lock(&glob->lock);
  177                 if (unlikely(ret != 0))
  178                         goto out;
  179         }
  180 out:
  181         mtx_unlock(&glob->lock);
  182 }
  183 
  184 
  185 
  186 static void ttm_shrink_work(void *arg, int pending __unused)
  187 {
  188         struct ttm_mem_global *glob = arg;
  189 
  190         ttm_shrink(glob, true, 0ULL);
  191 }
  192 
  193 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
  194     uint64_t mem)
  195 {
  196         struct ttm_mem_zone *zone;
  197 
  198         zone = malloc(sizeof(*zone), M_TTM_ZONE, M_WAITOK | M_ZERO);
  199 
  200         zone->name = "kernel";
  201         zone->zone_mem = mem;
  202         zone->max_mem = mem >> 1;
  203         zone->emer_mem = (mem >> 1) + (mem >> 2);
  204         zone->swap_limit = zone->max_mem - (mem >> 3);
  205         zone->used_mem = 0;
  206         zone->glob = glob;
  207         glob->zone_kernel = zone;
  208         refcount_init(&zone->kobj_ref, 1);
  209         glob->zones[glob->num_zones++] = zone;
  210         return 0;
  211 }
  212 
  213 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
  214     uint64_t mem)
  215 {
  216         struct ttm_mem_zone *zone;
  217 
  218         zone = malloc(sizeof(*zone), M_TTM_ZONE, M_WAITOK | M_ZERO);
  219 
  220         /**
  221          * No special dma32 zone needed.
  222          */
  223 
  224         if (mem <= ((uint64_t) 1ULL << 32)) {
  225                 free(zone, M_TTM_ZONE);
  226                 return 0;
  227         }
  228 
  229         /*
  230          * Limit max dma32 memory to 4GB for now
  231          * until we can figure out how big this
  232          * zone really is.
  233          */
  234 
  235         mem = ((uint64_t) 1ULL << 32);
  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         mtx_init(&glob->lock, "ttmgz", NULL, MTX_DEF);
  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, PVM, "ttm swap");
  260         TASK_INIT(&glob->work, 0, ttm_shrink_work, glob);
  261 
  262         refcount_init(&glob->kobj_ref, 1);
  263 
  264         mem = physmem * PAGE_SIZE;
  265 
  266         ret = ttm_mem_init_kernel_zone(glob, mem);
  267         if (unlikely(ret != 0))
  268                 goto out_no_zone;
  269         ret = ttm_mem_init_dma32_zone(glob, mem);
  270         if (unlikely(ret != 0))
  271                 goto out_no_zone;
  272         for (i = 0; i < glob->num_zones; ++i) {
  273                 zone = glob->zones[i];
  274                 printf("[TTM] Zone %7s: Available graphics memory: %llu kiB\n",
  275                         zone->name, (unsigned long long)zone->max_mem >> 10);
  276         }
  277         ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
  278         ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
  279         return 0;
  280 out_no_zone:
  281         ttm_mem_global_release(glob);
  282         return ret;
  283 }
  284 
  285 void ttm_mem_global_release(struct ttm_mem_global *glob)
  286 {
  287         unsigned int i;
  288         struct ttm_mem_zone *zone;
  289 
  290         /* let the page allocator first stop the shrink work. */
  291         ttm_page_alloc_fini();
  292         ttm_dma_page_alloc_fini();
  293 
  294         taskqueue_drain(glob->swap_queue, &glob->work);
  295         taskqueue_free(glob->swap_queue);
  296         glob->swap_queue = NULL;
  297         for (i = 0; i < glob->num_zones; ++i) {
  298                 zone = glob->zones[i];
  299                 if (refcount_release(&zone->kobj_ref))
  300                         ttm_mem_zone_kobj_release(zone);
  301         }
  302         if (refcount_release(&glob->kobj_ref))
  303                 ttm_mem_global_kobj_release(glob);
  304 }
  305 
  306 static void ttm_check_swapping(struct ttm_mem_global *glob)
  307 {
  308         bool needs_swapping = false;
  309         unsigned int i;
  310         struct ttm_mem_zone *zone;
  311 
  312         mtx_lock(&glob->lock);
  313         for (i = 0; i < glob->num_zones; ++i) {
  314                 zone = glob->zones[i];
  315                 if (zone->used_mem > zone->swap_limit) {
  316                         needs_swapping = true;
  317                         break;
  318                 }
  319         }
  320 
  321         mtx_unlock(&glob->lock);
  322 
  323         if (unlikely(needs_swapping))
  324                 taskqueue_enqueue(glob->swap_queue, &glob->work);
  325 
  326 }
  327 
  328 static void ttm_mem_global_free_zone(struct ttm_mem_global *glob,
  329                                      struct ttm_mem_zone *single_zone,
  330                                      uint64_t amount)
  331 {
  332         unsigned int i;
  333         struct ttm_mem_zone *zone;
  334 
  335         mtx_lock(&glob->lock);
  336         for (i = 0; i < glob->num_zones; ++i) {
  337                 zone = glob->zones[i];
  338                 if (single_zone && zone != single_zone)
  339                         continue;
  340                 zone->used_mem -= amount;
  341         }
  342         mtx_unlock(&glob->lock);
  343 }
  344 
  345 void ttm_mem_global_free(struct ttm_mem_global *glob,
  346                          uint64_t amount)
  347 {
  348         return ttm_mem_global_free_zone(glob, NULL, amount);
  349 }
  350 
  351 static int ttm_mem_global_reserve(struct ttm_mem_global *glob,
  352                                   struct ttm_mem_zone *single_zone,
  353                                   uint64_t amount, bool reserve)
  354 {
  355         uint64_t limit;
  356         int ret = -ENOMEM;
  357         unsigned int i;
  358         struct ttm_mem_zone *zone;
  359 
  360         mtx_lock(&glob->lock);
  361         for (i = 0; i < glob->num_zones; ++i) {
  362                 zone = glob->zones[i];
  363                 if (single_zone && zone != single_zone)
  364                         continue;
  365 
  366                 limit = (priv_check(curthread, PRIV_VM_MLOCK) == 0) ?
  367                         zone->emer_mem : zone->max_mem;
  368 
  369                 if (zone->used_mem > limit)
  370                         goto out_unlock;
  371         }
  372 
  373         if (reserve) {
  374                 for (i = 0; i < glob->num_zones; ++i) {
  375                         zone = glob->zones[i];
  376                         if (single_zone && zone != single_zone)
  377                                 continue;
  378                         zone->used_mem += amount;
  379                 }
  380         }
  381 
  382         ret = 0;
  383 out_unlock:
  384         mtx_unlock(&glob->lock);
  385         ttm_check_swapping(glob);
  386 
  387         return ret;
  388 }
  389 
  390 
  391 static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
  392                                      struct ttm_mem_zone *single_zone,
  393                                      uint64_t memory,
  394                                      bool no_wait, bool interruptible)
  395 {
  396         int count = TTM_MEMORY_ALLOC_RETRIES;
  397 
  398         while (unlikely(ttm_mem_global_reserve(glob,
  399                                                single_zone,
  400                                                memory, true)
  401                         != 0)) {
  402                 if (no_wait)
  403                         return -ENOMEM;
  404                 if (unlikely(count-- == 0))
  405                         return -ENOMEM;
  406                 ttm_shrink(glob, false, memory + (memory >> 2) + 16);
  407         }
  408 
  409         return 0;
  410 }
  411 
  412 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
  413                          bool no_wait, bool interruptible)
  414 {
  415         /**
  416          * Normal allocations of kernel memory are registered in
  417          * all zones.
  418          */
  419 
  420         return ttm_mem_global_alloc_zone(glob, NULL, memory, no_wait,
  421                                          interruptible);
  422 }
  423 
  424 #define page_to_pfn(pp) OFF_TO_IDX(VM_PAGE_TO_PHYS(pp))
  425 
  426 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
  427                               struct vm_page *page,
  428                               bool no_wait, bool interruptible)
  429 {
  430 
  431         struct ttm_mem_zone *zone = NULL;
  432 
  433         /**
  434          * Page allocations may be registed in a single zone
  435          * only if highmem or !dma32.
  436          */
  437 
  438         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
  439                 zone = glob->zone_kernel;
  440         return ttm_mem_global_alloc_zone(glob, zone, PAGE_SIZE, no_wait,
  441                                          interruptible);
  442 }
  443 
  444 void ttm_mem_global_free_page(struct ttm_mem_global *glob, struct vm_page *page)
  445 {
  446         struct ttm_mem_zone *zone = NULL;
  447 
  448         if (glob->zone_dma32 && page_to_pfn(page) > 0x00100000UL)
  449                 zone = glob->zone_kernel;
  450         ttm_mem_global_free_zone(glob, zone, PAGE_SIZE);
  451 }
  452 
  453 
  454 size_t ttm_round_pot(size_t size)
  455 {
  456         if ((size & (size - 1)) == 0)
  457                 return size;
  458         else if (size > PAGE_SIZE)
  459                 return PAGE_ALIGN(size);
  460         else {
  461                 size_t tmp_size = 4;
  462 
  463                 while (tmp_size < size)
  464                         tmp_size <<= 1;
  465 
  466                 return tmp_size;
  467         }
  468         return 0;
  469 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/drm2/ttm/ttm_memory.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/ttm/ttm_memory.c
