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