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 81 return sysfs_emit(buf, "%llu\n", amdgpu_gtt_mgr_usage(&adev->mman.gtt_mgr)); 82 } 83 84 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO, 85 amdgpu_mem_info_gtt_total_show, NULL); 86 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO, 87 amdgpu_mem_info_gtt_used_show, NULL); 88 89 static struct attribute *amdgpu_gtt_mgr_attributes[] = { 90 &dev_attr_mem_info_gtt_total.attr, 91 &dev_attr_mem_info_gtt_used.attr, 92 NULL 93 }; 94 95 const struct attribute_group amdgpu_gtt_mgr_attr_group = { 96 .attrs = amdgpu_gtt_mgr_attributes 97 }; 98 99 /** 100 * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space 101 * 102 * @res: the mem object to check 103 * 104 * Check if a mem object has already address space allocated. 105 */ 106 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_resource *res) 107 { 108 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res); 109 110 return drm_mm_node_allocated(&node->base.mm_nodes[0]); 111 } 112 113 /** 114 * amdgpu_gtt_mgr_new - allocate a new node 115 * 116 * @man: TTM memory type manager 117 * @tbo: TTM BO we need this range for 118 * @place: placement flags and restrictions 119 * @res: the resulting mem object 120 * 121 * Dummy, allocate the node but no space for it yet. 122 */ 123 static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man, 124 struct ttm_buffer_object *tbo, 125 const struct ttm_place *place, 126 struct ttm_resource **res) 127 { 128 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 129 uint32_t num_pages = PFN_UP(tbo->base.size); 130 struct amdgpu_gtt_node *node; 131 int r; 132 133 if (!(place->flags & TTM_PL_FLAG_TEMPORARY) && 134 atomic64_add_return(num_pages, &mgr->used) > man->size) { 135 atomic64_sub(num_pages, &mgr->used); 136 return -ENOSPC; 137 } 138 139 node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL); 140 if (!node) { 141 r = -ENOMEM; 142 goto err_out; 143 } 144 145 node->tbo = tbo; 146 ttm_resource_init(tbo, place, &node->base.base); 147 148 if (place->lpfn) { 149 spin_lock(&mgr->lock); 150 r = drm_mm_insert_node_in_range(&mgr->mm, 151 &node->base.mm_nodes[0], 152 num_pages, tbo->page_alignment, 153 0, place->fpfn, place->lpfn, 154 DRM_MM_INSERT_BEST); 155 spin_unlock(&mgr->lock); 156 if (unlikely(r)) 157 goto err_free; 158 159 node->base.base.start = node->base.mm_nodes[0].start; 160 } else { 161 node->base.mm_nodes[0].start = 0; 162 node->base.mm_nodes[0].size = node->base.base.num_pages; 163 node->base.base.start = AMDGPU_BO_INVALID_OFFSET; 164 } 165 166 *res = &node->base.base; 167 return 0; 168 169 err_free: 170 kfree(node); 171 172 err_out: 173 if (!(place->flags & TTM_PL_FLAG_TEMPORARY)) 174 atomic64_sub(num_pages, &mgr->used); 175 176 return r; 177 } 178 179 /** 180 * amdgpu_gtt_mgr_del - free ranges 181 * 182 * @man: TTM memory type manager 183 * @res: TTM memory object 184 * 185 * Free the allocated GTT again. 186 */ 187 static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man, 188 struct ttm_resource *res) 189 { 190 struct amdgpu_gtt_node *node = to_amdgpu_gtt_node(res); 191 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 192 193 spin_lock(&mgr->lock); 194 if (drm_mm_node_allocated(&node->base.mm_nodes[0])) 195 drm_mm_remove_node(&node->base.mm_nodes[0]); 196 spin_unlock(&mgr->lock); 197 198 if (!(res->placement & TTM_PL_FLAG_TEMPORARY)) 199 atomic64_sub(res->num_pages, &mgr->used); 200 201 kfree(node); 202 } 203 204 /** 205 * amdgpu_gtt_mgr_usage - return usage of GTT domain 206 * 207 * @mgr: amdgpu_gtt_mgr pointer 208 * 209 * Return how many bytes are used in the GTT domain 210 */ 211 uint64_t amdgpu_gtt_mgr_usage(struct amdgpu_gtt_mgr *mgr) 212 { 213 return atomic64_read(&mgr->used) * PAGE_SIZE; 214 } 215 216 /** 217 * amdgpu_gtt_mgr_recover - re-init gart 218 * 219 * @mgr: amdgpu_gtt_mgr pointer 220 * 221 * Re-init the gart for each known BO in the GTT. 222 */ 223 void amdgpu_gtt_mgr_recover(struct amdgpu_gtt_mgr *mgr) 224 { 225 struct amdgpu_gtt_node *node; 226 struct drm_mm_node *mm_node; 227 struct amdgpu_device *adev; 228 229 adev = container_of(mgr, typeof(*adev), mman.gtt_mgr); 230 spin_lock(&mgr->lock); 231 drm_mm_for_each_node(mm_node, &mgr->mm) { 232 node = container_of(mm_node, typeof(*node), base.mm_nodes[0]); 233 amdgpu_ttm_recover_gart(node->tbo); 234 } 235 spin_unlock(&mgr->lock); 236 237 amdgpu_gart_invalidate_tlb(adev); 238 } 239 240 /** 241 * amdgpu_gtt_mgr_debug - dump VRAM table 242 * 243 * @man: TTM memory type manager 244 * @printer: DRM printer to use 245 * 246 * Dump the table content using printk. 247 */ 248 static void amdgpu_gtt_mgr_debug(struct ttm_resource_manager *man, 249 struct drm_printer *printer) 250 { 251 struct amdgpu_gtt_mgr *mgr = to_gtt_mgr(man); 252 253 spin_lock(&mgr->lock); 254 drm_mm_print(&mgr->mm, printer); 255 spin_unlock(&mgr->lock); 256 257 drm_printf(printer, "man size:%llu pages, gtt used:%llu pages\n", 258 man->size, atomic64_read(&mgr->used)); 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->used, 0); 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