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 "amdgpu.h" 26 27 static inline struct amdgpu_gtt_mgr * 28 to_gtt_mgr(struct ttm_resource_manager *man) 29 { 30 return container_of(man, struct amdgpu_gtt_mgr, manager); 31 } 32 33 struct amdgpu_gtt_node { 34 struct drm_mm_node node; 35 struct ttm_buffer_object *tbo; 36 }; 37 38 /** 39 * DOC: mem_info_gtt_total 40 * 41 * The amdgpu driver provides a sysfs API for reporting current total size of 42 * the GTT. 43 * The file mem_info_gtt_total is used for this, and returns the total size of 44 * the GTT block, in bytes 45 */ 46 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev, 47 struct device_attribute *attr, 48 char *buf) 49 { 50 struct drm_device *ddev = dev_get_drvdata(dev); 51 struct amdgpu_device *adev = drm_to_adev(ddev); 52 struct ttm_resource_manager *man; 53 54 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 55 return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE); 56 } 57 58 /** 59 * DOC: mem_info_gtt_used 60 * 61 * The amdgpu driver provides a sysfs API for reporting current total amount of 62 * used GTT. 63 * The file mem_info_gtt_used is used for this, and returns the current used 64 * size of the GTT block, in bytes 65 */ 66 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev, 67 struct device_attribute *attr, 68 char *buf) 69 { 70 struct drm_device *ddev = dev_get_drvdata(dev); 71 struct amdgpu_device *adev = drm_to_adev(ddev); 72 struct ttm_resource_manager *man; 73 74 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 75 return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man)); 76 } 77 78 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO, 79 amdgpu_mem_info_gtt_total_show, NULL); 80 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO, 81 amdgpu_mem_info_gtt_used_show, NULL); 82 83 static struct attribute *amdgpu_gtt_mgr_attributes[] = { 84 &dev_attr_mem_info_gtt_total.attr, 85 &dev_attr_mem_info_gtt_used.attr, 86 NULL 87 }; 88 89 const struct attribute_group amdgpu_gtt_mgr_attr_group = { 90 .attrs = amdgpu_gtt_mgr_attributes 91 }; 92 93 /** 94 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space 95 * 96 * @mem: the mem object to check 97 * 98 * Check if a mem object has already address space allocated. 99 */ 100 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *mem) 101 { 102 return mem->mm_node != NULL; 103 } 104 105 /** 106 * amdgpu_gtt_mgr_new - allocate a new node 107 * 108 * @man: TTM memory type manager 109 * @tbo: TTM BO we need this range for 110 * @place: placement flags and restrictions 111 * @mem: the resulting mem object 112 * 113 * Dummy, allocate the node but no space for it yet. 114 */ 115 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man, 116 struct ttm_buffer_object *tbo, 117 const struct ttm_place *place, 118 struct ttm_resource *mem) 119 { 120 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 121 struct amdgpu_gtt_node *node; 122 int r; 123 124 spin_lock(&mgr->lock); 125 if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) && 126 atomic64_read(&mgr->available) < mem->num_pages) { 127 spin_unlock(&mgr->lock); 128 return -ENOSPC; 129 } 130 atomic64_sub(mem->num_pages, &mgr->available); 131 spin_unlock(&mgr->lock); 132 133 if (!place->lpfn) { 134 mem->mm_node = NULL; 135 mem->start = AMDGPU_BO_INVALID_OFFSET; 136 return 0; 137 } 138 139 node = kzalloc(sizeof(*node), GFP_KERNEL); 140 if (!node) { 141 r = -ENOMEM; 142 goto err_out; 143 } 144 145 node->tbo = tbo; 146 147 spin_lock(&mgr->lock); 148 r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages, 149 tbo->page_alignment, 0, place->fpfn, 150 place->lpfn, DRM_MM_INSERT_BEST); 151 spin_unlock(&mgr->lock); 152 153 if (unlikely(r)) 154 goto err_free; 155 156 mem->mm_node = node; 157 mem->start = node->node.start; 158 159 return 0; 160 161 err_free: 162 kfree(node); 163 164 err_out: 165 atomic64_add(mem->num_pages, &mgr->available); 166 167 return r; 168 } 169 170 /** 171 * amdgpu_gtt_mgr_del - free ranges 172 * 173 * @man: TTM memory type manager 174 * @mem: TTM memory object 175 * 176 * Free the allocated GTT again. 177 */ 178 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man, 179 struct ttm_resource *mem) 180 { 181 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 182 struct amdgpu_gtt_node *node = mem->mm_node; 183 184 if (node) { 185 spin_lock(&mgr->lock); 186 drm_mm_remove_node(&node->node); 187 spin_unlock(&mgr->lock); 188 kfree(node); 189 } 190 191 atomic64_add(mem->num_pages, &mgr->available); 192 } 193 194 /** 195 * amdgpu_gtt_mgr_usage - return usage of GTT domain 196 * 197 * @man: TTM memory type manager 198 * 199 * Return how many bytes are used in the GTT domain 200 */ 201 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man) 202 { 203 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 204 s64 result = man->size - atomic64_read(&mgr->available); 205 206 return (result > 0 ? result : 0) * PAGE_SIZE; 207 } 208 209 /** 210 * amdgpu_gtt_mgr_recover - re-init gart 211 * 212 * @man: TTM memory type manager 213 * 214 * Re-init the gart for each known BO in the GTT. 215 */ 216 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man) 217 { 218 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 219 struct amdgpu_device *adev; 220 struct amdgpu_gtt_node *node; 221 struct drm_mm_node *mm_node; 222 int r = 0; 223 224 adev = container_of(mgr, typeof(*adev), mman.gtt_mgr); 225 spin_lock(&mgr->lock); 226 drm_mm_for_each_node(mm_node, &mgr->mm) { 227 node = container_of(mm_node, struct amdgpu_gtt_node, node); 228 r = amdgpu_ttm_recover_gart(node->tbo); 229 if (r) 230 break; 231 } 232 spin_unlock(&mgr->lock); 233 234 amdgpu_gart_invalidate_tlb(adev); 235 236 return r; 237 } 238 239 /** 240 * amdgpu_gtt_mgr_debug - dump VRAM table 241 * 242 * @man: TTM memory type manager 243 * @printer: DRM printer to use 244 * 245 * Dump the table content using printk. 246 */ 247 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man, 248 struct drm_printer *printer) 249 { 250 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 251 252 spin_lock(&mgr->lock); 253 drm_mm_print(&mgr->mm, printer); 254 spin_unlock(&mgr->lock); 255 256 drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n", 257 man->size, (u64)atomic64_read(&mgr->available), 258 amdgpu_gtt_mgr_usage(man) >> 20); 259 } 260 261 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = { 262 .alloc = amdgpu_gtt_mgr_new, 263 .free = amdgpu_gtt_mgr_del, 264 .debug = amdgpu_gtt_mgr_debug 265 }; 266 267 /** 268 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM 269 * 270 * @adev: amdgpu_device pointer 271 * @gtt_size: maximum size of GTT 272 * 273 * Allocate and initialize the GTT manager. 274 */ 275 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size) 276 { 277 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 278 struct ttm_resource_manager *man = &mgr->manager; 279 uint64_t start, size; 280 281 man->use_tt = true; 282 man->func = &amdgpu_gtt_mgr_func; 283 284 ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT); 285 286 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS; 287 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start; 288 drm_mm_init(&mgr->mm, start, size); 289 spin_lock_init(&mgr->lock); 290 atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT); 291 292 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager); 293 ttm_resource_manager_set_used(man, true); 294 return 0; 295 } 296 297 /** 298 * amdgpu_gtt_mgr_fini - free and destroy GTT manager 299 * 300 * @adev: amdgpu_device pointer 301 * 302 * Destroy and free the GTT manager, returns -EBUSY if ranges are still 303 * allocated inside it. 304 */ 305 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev) 306 { 307 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 308 struct ttm_resource_manager *man = &mgr->manager; 309 int ret; 310 311 ttm_resource_manager_set_used(man, false); 312 313 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man); 314 if (ret) 315 return; 316 317 spin_lock(&mgr->lock); 318 drm_mm_takedown(&mgr->mm); 319 spin_unlock(&mgr->lock); 320 321 ttm_resource_manager_cleanup(man); 322 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL); 323 } 324