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_insert_mode mode; 101 unsigned long fpfn, lpfn; 102 int r; 103 104 if (node->start != AMDGPU_BO_INVALID_OFFSET) 105 return 0; 106 107 if (place) 108 fpfn = place->fpfn; 109 else 110 fpfn = 0; 111 112 if (place && place->lpfn) 113 lpfn = place->lpfn; 114 else 115 lpfn = man->size; 116 117 mode = DRM_MM_INSERT_BEST; 118 if (place && place->flags & TTM_PL_FLAG_TOPDOWN) 119 mode = DRM_MM_INSERT_HIGH; 120 121 spin_lock(&mgr->lock); 122 r = drm_mm_insert_node_in_range(&mgr->mm, node, 123 mem->num_pages, mem->page_alignment, 0, 124 fpfn, lpfn, mode); 125 spin_unlock(&mgr->lock); 126 127 if (!r) { 128 mem->start = node->start; 129 if (&tbo->mem == mem) 130 tbo->offset = (tbo->mem.start << PAGE_SHIFT) + 131 tbo->bdev->man[tbo->mem.mem_type].gpu_offset; 132 } 133 134 return r; 135 } 136 137 /** 138 * amdgpu_gtt_mgr_new - allocate a new node 139 * 140 * @man: TTM memory type manager 141 * @tbo: TTM BO we need this range for 142 * @place: placement flags and restrictions 143 * @mem: the resulting mem object 144 * 145 * Dummy, allocate the node but no space for it yet. 146 */ 147 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man, 148 struct ttm_buffer_object *tbo, 149 const struct ttm_place *place, 150 struct ttm_mem_reg *mem) 151 { 152 struct amdgpu_gtt_mgr *mgr = man->priv; 153 struct drm_mm_node *node; 154 int r; 155 156 spin_lock(&mgr->lock); 157 if (mgr->available < mem->num_pages) { 158 spin_unlock(&mgr->lock); 159 return 0; 160 } 161 mgr->available -= mem->num_pages; 162 spin_unlock(&mgr->lock); 163 164 node = kzalloc(sizeof(*node), GFP_KERNEL); 165 if (!node) { 166 r = -ENOMEM; 167 goto err_out; 168 } 169 170 node->start = AMDGPU_BO_INVALID_OFFSET; 171 node->size = mem->num_pages; 172 mem->mm_node = node; 173 174 if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) { 175 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem); 176 if (unlikely(r)) { 177 kfree(node); 178 mem->mm_node = NULL; 179 r = 0; 180 goto err_out; 181 } 182 } else { 183 mem->start = node->start; 184 } 185 186 return 0; 187 err_out: 188 spin_lock(&mgr->lock); 189 mgr->available += mem->num_pages; 190 spin_unlock(&mgr->lock); 191 192 return r; 193 } 194 195 /** 196 * amdgpu_gtt_mgr_del - free ranges 197 * 198 * @man: TTM memory type manager 199 * @tbo: TTM BO we need this range for 200 * @place: placement flags and restrictions 201 * @mem: TTM memory object 202 * 203 * Free the allocated GTT again. 204 */ 205 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man, 206 struct ttm_mem_reg *mem) 207 { 208 struct amdgpu_gtt_mgr *mgr = man->priv; 209 struct drm_mm_node *node = mem->mm_node; 210 211 if (!node) 212 return; 213 214 spin_lock(&mgr->lock); 215 if (node->start != AMDGPU_BO_INVALID_OFFSET) 216 drm_mm_remove_node(node); 217 mgr->available += mem->num_pages; 218 spin_unlock(&mgr->lock); 219 220 kfree(node); 221 mem->mm_node = NULL; 222 } 223 224 /** 225 * amdgpu_gtt_mgr_debug - dump VRAM table 226 * 227 * @man: TTM memory type manager 228 * @prefix: text prefix 229 * 230 * Dump the table content using printk. 231 */ 232 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man, 233 const char *prefix) 234 { 235 struct amdgpu_gtt_mgr *mgr = man->priv; 236 struct drm_printer p = drm_debug_printer(prefix); 237 238 spin_lock(&mgr->lock); 239 drm_mm_print(&mgr->mm, &p); 240 spin_unlock(&mgr->lock); 241 } 242 243 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = { 244 .init = amdgpu_gtt_mgr_init, 245 .takedown = amdgpu_gtt_mgr_fini, 246 .get_node = amdgpu_gtt_mgr_new, 247 .put_node = amdgpu_gtt_mgr_del, 248 .debug = amdgpu_gtt_mgr_debug 249 }; 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