drivers/gpu/drm/ttm/ttm_range_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 ttm_resource_manager manager;
  48         struct drm_mm mm;
  49         spinlock_t lock;
  50 };
  51
  52 static inline struct ttm_range_manager *to_range_manager(struct ttm_resource_manager *man)
  53 {
  54         return container_of(man, struct ttm_range_manager, manager);
  55 }
  56
  57 static int ttm_range_man_alloc(struct ttm_resource_manager *man,
  58                                struct ttm_buffer_object *bo,
  59                                const struct ttm_place *place,
  60                                struct ttm_resource *mem)
  61 {
  62         struct ttm_range_manager *rman = to_range_manager(man);
  63         struct drm_mm *mm = &rman->mm;
  64         struct drm_mm_node *node;
  65         enum drm_mm_insert_mode mode;
  66         unsigned long lpfn;
  67         int ret;
  68
  69         lpfn = place->lpfn;
  70         if (!lpfn)
  71                 lpfn = man->size;
  72
  73         node = kzalloc(sizeof(*node), GFP_KERNEL);
  74         if (!node)
  75                 return -ENOMEM;
  76
  77         mode = DRM_MM_INSERT_BEST;
  78         if (place->flags & TTM_PL_FLAG_TOPDOWN)
  79                 mode = DRM_MM_INSERT_HIGH;
  80
  81         spin_lock(&rman->lock);
  82         ret = drm_mm_insert_node_in_range(mm, node,
  83                                           mem->num_pages,
  84                                           mem->page_alignment, 0,
  85                                           place->fpfn, lpfn, mode);
  86         spin_unlock(&rman->lock);
  87
  88         if (unlikely(ret)) {
  89                 kfree(node);
  90         } else {
  91                 mem->mm_node = node;
  92                 mem->start = node->start;
  93         }
  94
  95         return ret;
  96 }
  97
  98 static void ttm_range_man_free(struct ttm_resource_manager *man,
  99                                struct ttm_resource *mem)
 100 {
 101         struct ttm_range_manager *rman = to_range_manager(man);
 102
 103         if (mem->mm_node) {
 104                 spin_lock(&rman->lock);
 105                 drm_mm_remove_node(mem->mm_node);
 106                 spin_unlock(&rman->lock);
 107
 108                 kfree(mem->mm_node);
 109                 mem->mm_node = NULL;
 110         }
 111 }
 112
 113 static const struct ttm_resource_manager_func ttm_range_manager_func;
 114
 115 int ttm_range_man_init(struct ttm_bo_device *bdev,
 116                        unsigned type, bool use_tt,
 117                        unsigned long p_size)
 118 {
 119         struct ttm_resource_manager *man;
 120         struct ttm_range_manager *rman;
 121
 122         rman = kzalloc(sizeof(*rman), GFP_KERNEL);
 123         if (!rman)
 124                 return -ENOMEM;
 125
 126         man = &rman->manager;
 127         man->use_tt = use_tt;
 128
 129         man->func = &ttm_range_manager_func;
 130
 131         ttm_resource_manager_init(man, p_size);
 132
 133         drm_mm_init(&rman->mm, 0, p_size);
 134         spin_lock_init(&rman->lock);
 135
 136         ttm_set_driver_manager(bdev, type, &rman->manager);
 137         ttm_resource_manager_set_used(man, true);
 138         return 0;
 139 }
 140 EXPORT_SYMBOL(ttm_range_man_init);
 141
 142 int ttm_range_man_fini(struct ttm_bo_device *bdev,
 143                        unsigned type)
 144 {
 145         struct ttm_resource_manager *man = ttm_manager_type(bdev, type);
 146         struct ttm_range_manager *rman = to_range_manager(man);
 147         struct drm_mm *mm = &rman->mm;
 148         int ret;
 149
 150         ttm_resource_manager_set_used(man, false);
 151
 152         ret = ttm_resource_manager_evict_all(bdev, man);
 153         if (ret)
 154                 return ret;
 155
 156         spin_lock(&rman->lock);
 157         drm_mm_clean(mm);
 158         drm_mm_takedown(mm);
 159         spin_unlock(&rman->lock);
 160
 161         ttm_resource_manager_cleanup(man);
 162         ttm_set_driver_manager(bdev, type, NULL);
 163         kfree(rman);
 164         return 0;
 165 }
 166 EXPORT_SYMBOL(ttm_range_man_fini);
 167
 168 static void ttm_range_man_debug(struct ttm_resource_manager *man,
 169                                 struct drm_printer *printer)
 170 {
 171         struct ttm_range_manager *rman = to_range_manager(man);
 172
 173         spin_lock(&rman->lock);
 174         drm_mm_print(&rman->mm, printer);
 175         spin_unlock(&rman->lock);
 176 }
 177
 178 static const struct ttm_resource_manager_func ttm_range_manager_func = {
 179         .alloc = ttm_range_man_alloc,
 180         .free = ttm_range_man_free,
 181         .debug = ttm_range_man_debug
 182 };