1 /* 2 * Copyright 2016 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Christian König 23 */ 24 25 #include <drm/drmP.h> 26 #include "amdgpu.h" 27 28 struct amdgpu_gtt_mgr { 29 struct drm_mm mm; 30 spinlock_t lock; 31 uint64_t available; 32 }; 33 34 /** 35 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM 36 * 37 * @man: TTM memory type manager 38 * @p_size: maximum size of GTT 39 * 40 * Allocate and initialize the GTT manager. 41 */ 42 static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man, 43 unsigned long p_size) 44 { 45 struct amdgpu_gtt_mgr *mgr; 46 47 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); 48 if (!mgr) 49 return -ENOMEM; 50 51 drm_mm_init(&mgr->mm, 0, p_size); 52 spin_lock_init(&mgr->lock); 53 mgr->available = p_size; 54 man->priv = mgr; 55 return 0; 56 } 57 58 /** 59 * amdgpu_gtt_mgr_fini - free and destroy GTT manager 60 * 61 * @man: TTM memory type manager 62 * 63 * Destroy and free the GTT manager, returns -EBUSY if ranges are still 64 * allocated inside it. 65 */ 66 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man) 67 { 68 struct amdgpu_gtt_mgr *mgr = man->priv; 69 70 spin_lock(&mgr->lock); 71 if (!drm_mm_clean(&mgr->mm)) { 72 spin_unlock(&mgr->lock); 73 return -EBUSY; 74 } 75 76 drm_mm_takedown(&mgr->mm); 77 spin_unlock(&mgr->lock); 78 kfree(mgr); 79 man->priv = NULL; 80 return 0; 81 } 82 83 /** 84 * amdgpu_gtt_mgr_alloc - allocate new ranges 85 * 86 * @man: TTM memory type manager 87 * @tbo: TTM BO we need this range for 88 * @place: placement flags and restrictions 89 * @mem: the resulting mem object 90 * 91 * Allocate the address space for a node. 92 */ 93 int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man, 94 struct ttm_buffer_object *tbo, 95 const struct ttm_place *place, 96 struct ttm_mem_reg *mem) 97 { 98 struct amdgpu_gtt_mgr *mgr = man->priv; 99 struct drm_mm_node *node = mem->mm_node; 100 enum drm_mm_search_flags sflags = DRM_MM_SEARCH_BEST; 101 enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT; 102 unsigned long fpfn, lpfn; 103 int r; 104 105 if (node->start != AMDGPU_BO_INVALID_OFFSET) 106 return 0; 107 108 if (place) 109 fpfn = place->fpfn; 110 else 111 fpfn = 0; 112 113 if (place && place->lpfn) 114 lpfn = place->lpfn; 115 else 116 lpfn = man->size; 117 118 if (place && place->flags & TTM_PL_FLAG_TOPDOWN) { 119 sflags = DRM_MM_SEARCH_BELOW; 120 aflags = DRM_MM_CREATE_TOP; 121 } 122 123 spin_lock(&mgr->lock); 124 r = drm_mm_insert_node_in_range_generic(&mgr->mm, node, mem->num_pages, 125 mem->page_alignment, 0, 126 fpfn, lpfn, sflags, aflags); 127 spin_unlock(&mgr->lock); 128 129 if (!r) { 130 mem->start = node->start; 131 if (&tbo->mem == mem) 132 tbo->offset = (tbo->mem.start << PAGE_SHIFT) + 133 tbo->bdev->man[tbo->mem.mem_type].gpu_offset; 134 } 135 136 return r; 137 } 138 139 /** 140 * amdgpu_gtt_mgr_new - allocate a new node 141 * 142 * @man: TTM memory type manager 143 * @tbo: TTM BO we need this range for 144 * @place: placement flags and restrictions 145 * @mem: the resulting mem object 146 * 147 * Dummy, allocate the node but no space for it yet. 148 */ 149 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man, 150 struct ttm_buffer_object *tbo, 151 const struct ttm_place *place, 152 struct ttm_mem_reg *mem) 153 { 154 struct amdgpu_gtt_mgr *mgr = man->priv; 155 struct drm_mm_node *node; 156 int r; 157 158 spin_lock(&mgr->lock); 159 if (mgr->available < mem->num_pages) { 160 spin_unlock(&mgr->lock); 161 return 0; 162 } 163 mgr->available -= mem->num_pages; 164 spin_unlock(&mgr->lock); 165 166 node = kzalloc(sizeof(*node), GFP_KERNEL); 167 if (!node) { 168 r = -ENOMEM; 169 goto err_out; 170 } 171 172 node->start = AMDGPU_BO_INVALID_OFFSET; 173 node->size = mem->num_pages; 174 mem->mm_node = node; 175 176 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) { 177 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem); 178 if (unlikely(r)) { 179 kfree(node); 180 mem->mm_node = NULL; 181 r = 0; 182 goto err_out; 183 } 184 } else { 185 mem->start = node->start; 186 } 187 188 return 0; 189 err_out: 190 spin_lock(&mgr->lock); 191 mgr->available += mem->num_pages; 192 spin_unlock(&mgr->lock); 193 194 return r; 195 } 196 197 /** 198 * amdgpu_gtt_mgr_del - free ranges 199 * 200 * @man: TTM memory type manager 201 * @tbo: TTM BO we need this range for 202 * @place: placement flags and restrictions 203 * @mem: TTM memory object 204 * 205 * Free the allocated GTT again. 206 */ 207 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man, 208 struct ttm_mem_reg *mem) 209 { 210 struct amdgpu_gtt_mgr *mgr = man->priv; 211 struct drm_mm_node *node = mem->mm_node; 212 213 if (!node) 214 return; 215 216 spin_lock(&mgr->lock); 217 if (node->start != AMDGPU_BO_INVALID_OFFSET) 218 drm_mm_remove_node(node); 219 mgr->available += mem->num_pages; 220 spin_unlock(&mgr->lock); 221 222 kfree(node); 223 mem->mm_node = NULL; 224 } 225 226 /** 227 * amdgpu_gtt_mgr_debug - dump VRAM table 228 * 229 * @man: TTM memory type manager 230 * @prefix: text prefix 231 * 232 * Dump the table content using printk. 233 */ 234 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man, 235 const char *prefix) 236 { 237 struct amdgpu_gtt_mgr *mgr = man->priv; 238 239 spin_lock(&mgr->lock); 240 drm_mm_debug_table(&mgr->mm, prefix); 241 spin_unlock(&mgr->lock); 242 } 243 244 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = { 245 amdgpu_gtt_mgr_init, 246 amdgpu_gtt_mgr_fini, 247 amdgpu_gtt_mgr_new, 248 amdgpu_gtt_mgr_del, 249 amdgpu_gtt_mgr_debug 250 }; 251