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 }; 182