LXR linux/drivers/gpu/drm/ttm/ttm_bo

   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 "ttm/ttm_module.h"
  32#include "ttm/ttm_bo_driver.h"
  33#include "ttm/ttm_placement.h"
  34#include "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
  45struct ttm_range_manager {
  46        struct drm_mm mm;
  47        spinlock_t lock;
  48};
  49
  50static 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
  89static 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
 102static 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 = kzalloc(sizeof(*rman), GFP_KERNEL);
 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        spin_lock_init(&rman->lock);
 119        man->priv = rman;
 120        return 0;
 121}
 122
 123static 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        spin_lock(&rman->lock);
 129        if (drm_mm_clean(mm)) {
 130                drm_mm_takedown(mm);
 131                spin_unlock(&rman->lock);
 132                kfree(rman);
 133                man->priv = NULL;
 134                return 0;
 135        }
 136        spin_unlock(&rman->lock);
 137        return -EBUSY;
 138}
 139
 140static 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        spin_lock(&rman->lock);
 146        drm_mm_debug_table(&rman->mm, prefix);
 147        spin_unlock(&rman->lock);
 148}
 149
 150const 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};
 157EXPORT_SYMBOL(ttm_bo_manager_func);
 158