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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.                                struct ttm_mem_reg *mem)
  54. {
  55.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  56.         struct drm_mm *mm = &rman->mm;
  57.         struct drm_mm_node *node = NULL;
  58.         unsigned long lpfn;
  59.         int ret;
  60.  
  61.         lpfn = placement->lpfn;
  62.         if (!lpfn)
  63.                 lpfn = man->size;
  64.  
  65.         node = kzalloc(sizeof(*node), GFP_KERNEL);
  66.         if (!node)
  67.                 return -ENOMEM;
  68.  
  69.                 spin_lock(&rman->lock);
  70.         ret = drm_mm_insert_node_in_range(mm, node, mem->num_pages,
  71.                                                      mem->page_alignment,
  72.                                           placement->fpfn, lpfn,
  73.                                           DRM_MM_SEARCH_BEST);
  74.                 spin_unlock(&rman->lock);
  75.  
  76.         if (unlikely(ret)) {
  77.                 kfree(node);
  78.         } else {
  79.         mem->mm_node = node;
  80.         mem->start = node->start;
  81.         }
  82.  
  83.         return 0;
  84. }
  85.  
  86. static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  87.                                 struct ttm_mem_reg *mem)
  88. {
  89.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  90.  
  91.         if (mem->mm_node) {
  92.                 spin_lock(&rman->lock);
  93.                 drm_mm_remove_node(mem->mm_node);
  94.                 spin_unlock(&rman->lock);
  95.  
  96.                 kfree(mem->mm_node);
  97.                 mem->mm_node = NULL;
  98.         }
  99. }
  100.  
  101. static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
  102.                            unsigned long p_size)
  103. {
  104.         struct ttm_range_manager *rman;
  105.  
  106.         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
  107.         if (!rman)
  108.                 return -ENOMEM;
  109.  
  110.         drm_mm_init(&rman->mm, 0, p_size);
  111.         spin_lock_init(&rman->lock);
  112.         man->priv = rman;
  113.         return 0;
  114. }
  115.  
  116. static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
  117. {
  118.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  119.         struct drm_mm *mm = &rman->mm;
  120.  
  121.         spin_lock(&rman->lock);
  122.         if (drm_mm_clean(mm)) {
  123.                 drm_mm_takedown(mm);
  124.                 spin_unlock(&rman->lock);
  125.                 kfree(rman);
  126.                 man->priv = NULL;
  127.                 return 0;
  128.         }
  129.         spin_unlock(&rman->lock);
  130.         return -EBUSY;
  131. }
  132.  
  133. static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
  134.                              const char *prefix)
  135. {
  136.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  137.  
  138.         spin_lock(&rman->lock);
  139.         drm_mm_debug_table(&rman->mm, prefix);
  140.         spin_unlock(&rman->lock);
  141. }
  142.  
  143. const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
  144.         ttm_bo_man_init,
  145.         ttm_bo_man_takedown,
  146.         ttm_bo_man_get_node,
  147.         ttm_bo_man_put_node,
  148.         ttm_bo_man_debug
  149. };
  150. EXPORT_SYMBOL(ttm_bo_manager_func);
  151.