sys/dev/drm/ttm/ttm_bo_manager.c

   1 /**************************************************************************
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   3  * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
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  12  * the following conditions:
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  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.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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  26  **************************************************************************/
  27 /*
  28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  29  *
  30  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_manager.c 247835 2013-03-05 09:49:34Z kib $
  31  */
  32
  33 #include <drm/ttm/ttm_module.h>
  34 #include <drm/ttm/ttm_bo_driver.h>
  35 #include <drm/ttm/ttm_placement.h>
  36 #include <drm/drm_mm.h>
  37 #include <linux/export.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         struct lock 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                 lockmgr(&rman->lock, LK_EXCLUSIVE);
  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                         lockmgr(&rman->lock, LK_RELEASE);
  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                 lockmgr(&rman->lock, LK_RELEASE);
  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                 lockmgr(&rman->lock, LK_EXCLUSIVE);
  96                 drm_mm_put_block(mem->mm_node);
  97                 lockmgr(&rman->lock, LK_RELEASE);
  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         int ret;
 107
 108         rman = kmalloc(sizeof(*rman), M_DRM, M_ZERO | M_WAITOK);
 109         if (!rman)
 110                 return -ENOMEM;
 111
 112         ret = drm_mm_init(&rman->mm, 0, p_size);
 113         if (ret) {
 114                 kfree(rman);
 115                 return ret;
 116         }
 117
 118         lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE);
 119         man->priv = rman;
 120         return 0;
 121 }
 122
 123 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 124 {
 125         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 126         struct drm_mm *mm = &rman->mm;
 127
 128         lockmgr(&rman->lock, LK_EXCLUSIVE);
 129         if (drm_mm_clean(mm)) {
 130                 drm_mm_takedown(mm);
 131                 lockmgr(&rman->lock, LK_RELEASE);
 132                 kfree(rman);
 133                 man->priv = NULL;
 134                 return 0;
 135         }
 136         lockmgr(&rman->lock, LK_RELEASE);
 137         return -EBUSY;
 138 }
 139
 140 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 141                              const char *prefix)
 142 {
 143         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 144
 145         lockmgr(&rman->lock, LK_EXCLUSIVE);
 146         drm_mm_debug_table(&rman->mm, prefix);
 147         lockmgr(&rman->lock, LK_RELEASE);
 148 }
 149
 150 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 151         ttm_bo_man_init,
 152         ttm_bo_man_takedown,
 153         ttm_bo_man_get_node,
 154         ttm_bo_man_put_node,
 155         ttm_bo_man_debug
 156 };
 157 EXPORT_SYMBOL(ttm_bo_manager_func);