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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.         do {
  65.                 ret = drm_mm_pre_get(mm);
  66.                 if (unlikely(ret))
  67.                         return ret;
  68.  
  69.                 spin_lock(&rman->lock);
  70.                 node = drm_mm_search_free_in_range(mm,
  71.                                         mem->num_pages, mem->page_alignment,
  72.                                         placement->fpfn, lpfn, 1);
  73.                 if (unlikely(node == NULL)) {
  74.                         spin_unlock(&rman->lock);
  75.                         return 0;
  76.                 }
  77.                 node = drm_mm_get_block_atomic_range(node, mem->num_pages,
  78.                                                      mem->page_alignment,
  79.                                                      placement->fpfn,
  80.                                                      lpfn);
  81.                 spin_unlock(&rman->lock);
  82.         } while (node == NULL);
  83.  
  84.         mem->mm_node = node;
  85.         mem->start = node->start;
  86.         return 0;
  87. }
  88.  
  89. static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  90.                                 struct ttm_mem_reg *mem)
  91. {
  92.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  93.  
  94.         if (mem->mm_node) {
  95.                 spin_lock(&rman->lock);
  96.                 drm_mm_put_block(mem->mm_node);
  97.                 spin_unlock(&rman->lock);
  98.                 mem->mm_node = NULL;
  99.         }
  100. }
  101.  
  102. static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
  103.                            unsigned long p_size)
  104. {
  105.         struct ttm_range_manager *rman;
  106.  
  107.         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
  108.         if (!rman)
  109.                 return -ENOMEM;
  110.  
  111.         drm_mm_init(&rman->mm, 0, p_size);
  112.         spin_lock_init(&rman->lock);
  113.         man->priv = rman;
  114.         return 0;
  115. }
  116.  
  117. static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
  118. {
  119.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  120.         struct drm_mm *mm = &rman->mm;
  121.  
  122.         spin_lock(&rman->lock);
  123.         if (drm_mm_clean(mm)) {
  124.                 drm_mm_takedown(mm);
  125.                 spin_unlock(&rman->lock);
  126.                 kfree(rman);
  127.                 man->priv = NULL;
  128.                 return 0;
  129.         }
  130.         spin_unlock(&rman->lock);
  131.         return -EBUSY;
  132. }
  133.  
  134. static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
  135.                              const char *prefix)
  136. {
  137.         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
  138.  
  139.         spin_lock(&rman->lock);
  140.         drm_mm_debug_table(&rman->mm, prefix);
  141.         spin_unlock(&rman->lock);
  142. }
  143.  
  144. const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
  145.         ttm_bo_man_init,
  146.         ttm_bo_man_takedown,
  147.         ttm_bo_man_get_node,
  148.         ttm_bo_man_put_node,
  149.         ttm_bo_man_debug
  150. };
  151. EXPORT_SYMBOL(ttm_bo_manager_func);
  152.