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 <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
  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                               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
  92static 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
 107static 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
 122static 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
 139static 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
 149const 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};
 156EXPORT_SYMBOL(ttm_bo_manager_func);
 157