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 to_range_manager(struct ttm_resource_manager * man)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 ttm_range_man_alloc(struct ttm_resource_manager * man,struct ttm_buffer_object * bo,const struct ttm_place * place,struct ttm_resource * mem)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 ttm_range_man_free(struct ttm_resource_manager * man,struct ttm_resource * mem)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 ttm_range_man_init(struct ttm_bo_device * bdev,unsigned type,bool use_tt,unsigned long p_size)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 ttm_range_man_fini(struct ttm_bo_device * bdev,unsigned type)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 if (!man) 151 return 0; 152 153 ttm_resource_manager_set_used(man, false); 154 155 ret = ttm_resource_manager_force_list_clean(bdev, man); 156 if (ret) 157 return ret; 158 159 spin_lock(&rman->lock); 160 drm_mm_clean(mm); 161 drm_mm_takedown(mm); 162 spin_unlock(&rman->lock); 163 164 ttm_resource_manager_cleanup(man); 165 ttm_set_driver_manager(bdev, type, NULL); 166 kfree(rman); 167 return 0; 168 } 169 EXPORT_SYMBOL(ttm_range_man_fini); 170 ttm_range_man_debug(struct ttm_resource_manager * man,struct drm_printer * printer)171 static void ttm_range_man_debug(struct ttm_resource_manager *man, 172 struct drm_printer *printer) 173 { 174 struct ttm_range_manager *rman = to_range_manager(man); 175 176 spin_lock(&rman->lock); 177 drm_mm_print(&rman->mm, printer); 178 spin_unlock(&rman->lock); 179 } 180 181 static const struct ttm_resource_manager_func ttm_range_manager_func = { 182 .alloc = ttm_range_man_alloc, 183 .free = ttm_range_man_free, 184 .debug = ttm_range_man_debug 185 }; 186