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/ttm/ttm_range_manager.h> 26 27 #include "amdgpu.h" 28 29 struct amdgpu_gtt_node { 30 struct ttm_buffer_object *tbo; 31 struct ttm_range_mgr_node base; 32 }; 33 34 static inline struct amdgpu_gtt_mgr * 35 to_gtt_mgr(struct ttm_resource_manager *man) 36 { 37 return container_of(man, struct amdgpu_gtt_mgr, manager); 38 } 39 40 static inline struct amdgpu_gtt_node * 41 to_amdgpu_gtt_node(struct ttm_resource *res) 42 { 43 return container_of(res, struct amdgpu_gtt_node, base.base); 44 } 45 46 /** 47 * DOC: mem_info_gtt_total 48 * 49 * The amdgpu driver provides a sysfs API for reporting current total size of 50 * the GTT. 51 * The file mem_info_gtt_total is used for this, and returns the total size of 52 * the GTT block, in bytes 53 */ 54 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev, 55 struct device_attribute *attr, 56 char *buf) 57 { 58 struct drm_device *ddev = dev_get_drvdata(dev); 59 struct amdgpu_device *adev = drm_to_adev(ddev); 60 struct ttm_resource_manager *man; 61 62 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 63 return sysfs_emit(buf, "%llu\n", man->size * PAGE_SIZE); 64 } 65 66 /** 67 * DOC: mem_info_gtt_used 68 * 69 * The amdgpu driver provides a sysfs API for reporting current total amount of 70 * used GTT. 71 * The file mem_info_gtt_used is used for this, and returns the current used 72 * size of the GTT block, in bytes 73 */ 74 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev, 75 struct device_attribute *attr, 76 char *buf) 77 { 78 struct drm_device *ddev = dev_get_drvdata(dev); 79 struct amdgpu_device *adev = drm_to_adev(ddev); 80 struct ttm_resource_manager *man; 81 82 man = ttm_manager_type(&adev->mman.bdev, TTM_PL_TT); 83 return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(man)); 84 } 85 86 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO, 87 amdgpu_mem_info_gtt_total_show, NULL); 88 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO, 89 amdgpu_mem_info_gtt_used_show, NULL); 90 91 static struct attribute *amdgpu_gtt_mgr_attributes[] = { 92 &dev_attr_mem_info_gtt_total.attr, 93 &dev_attr_mem_info_gtt_used.attr, 94 NULL 95 }; 96 97 const struct attribute_group amdgpu_gtt_mgr_attr_group = { 98 .attrs = amdgpu_gtt_mgr_attributes 99 }; 100 101 /** 102 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space 103 * 104 * @res: the mem object to check 105 * 106 * Check if a mem object has already address space allocated. 107 */ 108 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res) 109 { 110 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res); 111 112 return drm_mm_node_allocated(&node->base.mm_nodes[0]); 113 } 114 115 /** 116 * amdgpu_gtt_mgr_new - allocate a new node 117 * 118 * @man: TTM memory type manager 119 * @tbo: TTM BO we need this range for 120 * @place: placement flags and restrictions 121 * @mem: the resulting mem object 122 * 123 * Dummy, allocate the node but no space for it yet. 124 */ 125 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man, 126 struct ttm_buffer_object *tbo, 127 const struct ttm_place *place, 128 struct ttm_resource **res) 129 { 130 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 131 uint32_t num_pages = PFN_UP(tbo->base.size); 132 struct amdgpu_gtt_node *node; 133 int r; 134 135 spin_lock(&mgr->lock); 136 if (tbo->resource && tbo->resource->mem_type != TTM_PL_TT && 137 atomic64_read(&mgr->available) < num_pages) { 138 spin_unlock(&mgr->lock); 139 return -ENOSPC; 140 } 141 atomic64_sub(num_pages, &mgr->available); 142 spin_unlock(&mgr->lock); 143 144 node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL); 145 if (!node) { 146 r = -ENOMEM; 147 goto err_out; 148 } 149 150 node->tbo = tbo; 151 ttm_resource_init(tbo, place, &node->base.base); 152 153 if (place->lpfn) { 154 spin_lock(&mgr->lock); 155 r = drm_mm_insert_node_in_range(&mgr->mm, 156 &node->base.mm_nodes[0], 157 num_pages, tbo->page_alignment, 158 0, place->fpfn, place->lpfn, 159 DRM_MM_INSERT_BEST); 160 spin_unlock(&mgr->lock); 161 if (unlikely(r)) 162 goto err_free; 163 164 node->base.base.start = node->base.mm_nodes[0].start; 165 } else { 166 node->base.mm_nodes[0].start = 0; 167 node->base.mm_nodes[0].size = node->base.base.num_pages; 168 node->base.base.start = AMDGPU_BO_INVALID_OFFSET; 169 } 170 171 *res = &node->base.base; 172 return 0; 173 174 err_free: 175 kfree(node); 176 177 err_out: 178 atomic64_add(num_pages, &mgr->available); 179 180 return r; 181 } 182 183 /** 184 * amdgpu_gtt_mgr_del - free ranges 185 * 186 * @man: TTM memory type manager 187 * @mem: TTM memory object 188 * 189 * Free the allocated GTT again. 190 */ 191 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man, 192 struct ttm_resource *res) 193 { 194 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res); 195 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 196 197 spin_lock(&mgr->lock); 198 if (drm_mm_node_allocated(&node->base.mm_nodes[0])) 199 drm_mm_remove_node(&node->base.mm_nodes[0]); 200 spin_unlock(&mgr->lock); 201 atomic64_add(res->num_pages, &mgr->available); 202 203 kfree(node); 204 } 205 206 /** 207 * amdgpu_gtt_mgr_usage - return usage of GTT domain 208 * 209 * @man: TTM memory type manager 210 * 211 * Return how many bytes are used in the GTT domain 212 */ 213 uint64_t amdgpu_gtt_mgr_usage(struct ttm_resource_manager *man) 214 { 215 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 216 s64 result = man->size - atomic64_read(&mgr->available); 217 218 return (result > 0 ? result : 0) * PAGE_SIZE; 219 } 220 221 /** 222 * amdgpu_gtt_mgr_recover - re-init gart 223 * 224 * @man: TTM memory type manager 225 * 226 * Re-init the gart for each known BO in the GTT. 227 */ 228 int amdgpu_gtt_mgr_recover(struct ttm_resource_manager *man) 229 { 230 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 231 struct amdgpu_gtt_node *node; 232 struct drm_mm_node *mm_node; 233 int r = 0; 234 235 spin_lock(&mgr->lock); 236 drm_mm_for_each_node(mm_node, &mgr->mm) { 237 node = container_of(mm_node, typeof(*node), base.mm_nodes[0]); 238 r = amdgpu_ttm_recover_gart(node->tbo); 239 if (r) 240 break; 241 } 242 spin_unlock(&mgr->lock); 243 244 return r; 245 } 246 247 /** 248 * amdgpu_gtt_mgr_debug - dump VRAM table 249 * 250 * @man: TTM memory type manager 251 * @printer: DRM printer to use 252 * 253 * Dump the table content using printk. 254 */ 255 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man, 256 struct drm_printer *printer) 257 { 258 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 259 260 spin_lock(&mgr->lock); 261 drm_mm_print(&mgr->mm, printer); 262 spin_unlock(&mgr->lock); 263 264 drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n", 265 man->size, (u64)atomic64_read(&mgr->available), 266 amdgpu_gtt_mgr_usage(man) >> 20); 267 } 268 269 static const struct ttm_resource_manager_func amdgpu_gtt_mgr_func = { 270 .alloc = amdgpu_gtt_mgr_new, 271 .free = amdgpu_gtt_mgr_del, 272 .debug = amdgpu_gtt_mgr_debug 273 }; 274 275 /** 276 * amdgpu_gtt_mgr_init - init GTT manager and DRM MM 277 * 278 * @adev: amdgpu_device pointer 279 * @gtt_size: maximum size of GTT 280 * 281 * Allocate and initialize the GTT manager. 282 */ 283 int amdgpu_gtt_mgr_init(struct amdgpu_device *adev, uint64_t gtt_size) 284 { 285 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 286 struct ttm_resource_manager *man = &mgr->manager; 287 uint64_t start, size; 288 289 man->use_tt = true; 290 man->func = &amdgpu_gtt_mgr_func; 291 292 ttm_resource_manager_init(man, gtt_size >> PAGE_SHIFT); 293 294 start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS; 295 size = (adev->gmc.gart_size >> PAGE_SHIFT) - start; 296 drm_mm_init(&mgr->mm, start, size); 297 spin_lock_init(&mgr->lock); 298 atomic64_set(&mgr->available, gtt_size >> PAGE_SHIFT); 299 300 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, &mgr->manager); 301 ttm_resource_manager_set_used(man, true); 302 return 0; 303 } 304 305 /** 306 * amdgpu_gtt_mgr_fini - free and destroy GTT manager 307 * 308 * @adev: amdgpu_device pointer 309 * 310 * Destroy and free the GTT manager, returns -EBUSY if ranges are still 311 * allocated inside it. 312 */ 313 void amdgpu_gtt_mgr_fini(struct amdgpu_device *adev) 314 { 315 struct amdgpu_gtt_mgr *mgr = &adev->mman.gtt_mgr; 316 struct ttm_resource_manager *man = &mgr->manager; 317 int ret; 318 319 ttm_resource_manager_set_used(man, false); 320 321 ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man); 322 if (ret) 323 return; 324 325 spin_lock(&mgr->lock); 326 drm_mm_takedown(&mgr->mm); 327 spin_unlock(&mgr->lock); 328 329 ttm_resource_manager_cleanup(man); 330 ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_TT, NULL); 331 } 332