drivers/gpu/drm/ttm/ttm_bo_manager.c

   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,
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  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);