drivers/gpu/drm/ttm/ttm_bo_manager.c

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /**************************************************************************
   3  *
   4  * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  23  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  24  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  25  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28 /*
  29  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  30  */
  31
  32 #include <drm/ttm/ttm_module.h>
  33 #include <drm/ttm/ttm_bo_driver.h>
  34 #include <drm/ttm/ttm_placement.h>
  35 #include <drm/drm_mm.h>
  36 #include <linux/slab.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/module.h>
  39
  40 /**
  41  * Currently we use a spinlock for the lock, but a mutex *may* be
  42  * more appropriate to reduce scheduling latency if the range manager
  43  * ends up with very fragmented allocation patterns.
  44  */
  45
  46 struct ttm_range_manager {
  47         struct drm_mm mm;
  48         spinlock_t lock;
  49 };
  50
  51 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  52                                struct ttm_buffer_object *bo,
  53                                const struct ttm_place *place,
  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;
  59         enum drm_mm_insert_mode mode;
  60         unsigned long lpfn;
  61         int ret;
  62
  63         lpfn = place->lpfn;
  64         if (!lpfn)
  65                 lpfn = man->size;
  66
  67         node = kzalloc(sizeof(*node), GFP_KERNEL);
  68         if (!node)
  69                 return -ENOMEM;
  70
  71         mode = DRM_MM_INSERT_BEST;
  72         if (place->flags & TTM_PL_FLAG_TOPDOWN)
  73                 mode = DRM_MM_INSERT_HIGH;
  74
  75         spin_lock(&rman->lock);
  76         ret = drm_mm_insert_node_in_range(mm, node,
  77                                           mem->num_pages,
  78                                           mem->page_alignment, 0,
  79                                           place->fpfn, lpfn, mode);
  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                              struct drm_printer *printer)
 141 {
 142         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
 143
 144         spin_lock(&rman->lock);
 145         drm_mm_print(&rman->mm, printer);
 146         spin_unlock(&rman->lock);
 147 }
 148
 149 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
 150         .init = ttm_bo_man_init,
 151         .takedown = ttm_bo_man_takedown,
 152         .get_node = ttm_bo_man_get_node,
 153         .put_node = ttm_bo_man_put_node,
 154         .debug = ttm_bo_man_debug
 155 };
 156 EXPORT_SYMBOL(ttm_bo_manager_func);