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  1. /**************************************************************************
  2.  *
  3.  * Copyright (c) 2007-2010 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.  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29.  */
  30.  
  31. #include <drm/ttm/ttm_module.h>
  32. #include <drm/ttm/ttm_bo_driver.h>
  33. #include <drm/ttm/ttm_placement.h>
  34. #include <drm/drm_mm.h>
  35. #include <linux/slab.h>
  36. #include <linux/spinlock.h>
  37. #include <linux/module.h>
  38.  
  39. /**
  40.  * Currently we use a spinlock for the lock, but a mutex *may* be
  41.  * more appropriate to reduce scheduling latency if the range manager
  42.  * ends up with very fragmented allocation patterns.
  43.  */
  44.  
  45. struct ttm_range_manager {
  46.         struct drm_mm mm;
  47.         spinlock_t lock;
  48. };
  49.  
  50. static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  51.                                struct ttm_buffer_object *bo,
  52.                                struct ttm_placement *placement,
  53.                                uint32_t flags,
  54.                                struct ttm_mem_reg *mem)
  55. {
  56.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  57.         struct drm_mm *mm = &rman->mm;
  58.         struct drm_mm_node *node = NULL;
  59.         enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
  60.         unsigned long lpfn;
  61.         int ret;
  62.  
  63.         lpfn = placement->lpfn;
  64.         if (!lpfn)
  65.                 lpfn = man->size;
  66.  
  67.         node = kzalloc(sizeof(*node), GFP_KERNEL);
  68.         if (!node)
  69.                 return -ENOMEM;
  70.  
  71.         if (flags & TTM_PL_FLAG_TOPDOWN)
  72.                 aflags = DRM_MM_CREATE_TOP;
  73.  
  74.                 spin_lock(&rman->lock);
  75.         ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
  76.                                           mem->page_alignment, 0,
  77.                                           placement->fpfn, lpfn,
  78.                                           DRM_MM_SEARCH_BEST,
  79.                                           aflags);
  80.                 spin_unlock(&rman->lock);
  81.  
  82.         if (unlikely(ret)) {
  83.                 kfree(node);
  84.         } else {
  85.         mem->mm_node = node;
  86.         mem->start = node->start;
  87.         }
  88.  
  89.         return 0;
  90. }
  91.  
  92. static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  93.                                 struct ttm_mem_reg *mem)
  94. {
  95.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  96.  
  97.         if (mem->mm_node) {
  98.                 spin_lock(&rman->lock);
  99.                 drm_mm_remove_node(mem->mm_node);
  100.                 spin_unlock(&rman->lock);
  101.  
  102.                 kfree(mem->mm_node);
  103.                 mem->mm_node = NULL;
  104.         }
  105. }
  106.  
  107. static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
  108.                            unsigned long p_size)
  109. {
  110.         struct ttm_range_manager *rman;
  111.  
  112.         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
  113.         if (!rman)
  114.                 return -ENOMEM;
  115.  
  116.         drm_mm_init(&rman->mm, 0, p_size);
  117.         spin_lock_init(&rman->lock);
  118.         man->priv = rman;
  119.         return 0;
  120. }
  121.  
  122. static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
  123. {
  124.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  125.         struct drm_mm *mm = &rman->mm;
  126.  
  127.         spin_lock(&rman->lock);
  128.         if (drm_mm_clean(mm)) {
  129.                 drm_mm_takedown(mm);
  130.                 spin_unlock(&rman->lock);
  131.                 kfree(rman);
  132.                 man->priv = NULL;
  133.                 return 0;
  134.         }
  135.         spin_unlock(&rman->lock);
  136.         return -EBUSY;
  137. }
  138.  
  139. static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
  140.                              const char *prefix)
  141. {
  142.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  143.  
  144.         spin_lock(&rman->lock);
  145.         drm_mm_debug_table(&rman->mm, prefix);
  146.         spin_unlock(&rman->lock);
  147. }
  148.  
  149. const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
  150.         ttm_bo_man_init,
  151.         ttm_bo_man_takedown,
  152.         ttm_bo_man_get_node,
  153.         ttm_bo_man_put_node,
  154.         ttm_bo_man_debug
  155. };
  156. EXPORT_SYMBOL(ttm_bo_manager_func);
  157.