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_vram_mgr { 29 struct drm_mm mm; 30 struct spinlock lock; 31 atomic64_t usage; 32 atomic64_t vis_usage; 33 }; 34 35 /** 36 * amdgpu_vram_mgr_init - init VRAM manager and DRM MM 37 * 38 * @man: TTM memory type manager 39 * @p_size: maximum size of VRAM 40 * 41 * Allocate and initialize the VRAM manager. 42 */ 43 static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man, 44 unsigned long p_size) 45 { 46 struct amdgpu_vram_mgr *mgr; 47 48 mgr = kzalloc(sizeof(*mgr), GFP_KERNEL); 49 if (!mgr) 50 return -ENOMEM; 51 52 drm_mm_init(&mgr->mm, 0, p_size); 53 spin_init(&mgr->lock, "agvrml"); 54 man->priv = mgr; 55 return 0; 56 } 57 58 /** 59 * amdgpu_vram_mgr_fini - free and destroy VRAM manager 60 * 61 * @man: TTM memory type manager 62 * 63 * Destroy and free the VRAM manager, returns -EBUSY if ranges are still 64 * allocated inside it. 65 */ 66 static int amdgpu_vram_mgr_fini(struct ttm_mem_type_manager *man) 67 { 68 struct amdgpu_vram_mgr *mgr = man->priv; 69 70 spin_lock(&mgr->lock); 71 drm_mm_takedown(&mgr->mm); 72 spin_unlock(&mgr->lock); 73 kfree(mgr); 74 man->priv = NULL; 75 return 0; 76 } 77 78 /** 79 * amdgpu_vram_mgr_vis_size - Calculate visible node size 80 * 81 * @adev: amdgpu device structure 82 * @node: MM node structure 83 * 84 * Calculate how many bytes of the MM node are inside visible VRAM 85 */ 86 static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev, 87 struct drm_mm_node *node) 88 { 89 uint64_t start = node->start << PAGE_SHIFT; 90 uint64_t end = (node->size + node->start) << PAGE_SHIFT; 91 92 if (start >= adev->gmc.visible_vram_size) 93 return 0; 94 95 return (end > adev->gmc.visible_vram_size ? 96 adev->gmc.visible_vram_size : end) - start; 97 } 98 99 /** 100 * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size 101 * 102 * @bo: &amdgpu_bo buffer object (must be in VRAM) 103 * 104 * Returns: 105 * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM. 106 */ 107 u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo) 108 { 109 struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); 110 struct ttm_mem_reg *mem = &bo->tbo.mem; 111 struct drm_mm_node *nodes = mem->mm_node; 112 unsigned pages = mem->num_pages; 113 u64 usage; 114 115 if (amdgpu_gmc_vram_full_visible(&adev->gmc)) 116 return amdgpu_bo_size(bo); 117 118 if (mem->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT) 119 return 0; 120 121 for (usage = 0; nodes && pages; pages -= nodes->size, nodes++) 122 usage += amdgpu_vram_mgr_vis_size(adev, nodes); 123 124 return usage; 125 } 126 127 /** 128 * amdgpu_vram_mgr_new - allocate new ranges 129 * 130 * @man: TTM memory type manager 131 * @tbo: TTM BO we need this range for 132 * @place: placement flags and restrictions 133 * @mem: the resulting mem object 134 * 135 * Allocate VRAM for the given BO. 136 */ 137 static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, 138 struct ttm_buffer_object *tbo, 139 const struct ttm_place *place, 140 struct ttm_mem_reg *mem) 141 { 142 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 143 struct amdgpu_vram_mgr *mgr = man->priv; 144 struct drm_mm *mm = &mgr->mm; 145 struct drm_mm_node *nodes; 146 enum drm_mm_insert_mode mode; 147 unsigned long lpfn, num_nodes, pages_per_node, pages_left; 148 uint64_t usage = 0, vis_usage = 0; 149 unsigned i; 150 int r; 151 152 lpfn = place->lpfn; 153 if (!lpfn) 154 lpfn = man->size; 155 156 if (place->flags & TTM_PL_FLAG_CONTIGUOUS || 157 amdgpu_vram_page_split == -1) { 158 pages_per_node = ~0ul; 159 num_nodes = 1; 160 } else { 161 pages_per_node = max((uint32_t)amdgpu_vram_page_split, 162 mem->page_alignment); 163 num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node); 164 } 165 166 nodes = kvmalloc_array(num_nodes, sizeof(*nodes), 167 GFP_KERNEL | __GFP_ZERO); 168 if (!nodes) 169 return -ENOMEM; 170 171 mode = DRM_MM_INSERT_BEST; 172 if (place->flags & TTM_PL_FLAG_TOPDOWN) 173 mode = DRM_MM_INSERT_HIGH; 174 175 mem->start = 0; 176 pages_left = mem->num_pages; 177 178 spin_lock(&mgr->lock); 179 for (i = 0; i < num_nodes; ++i) { 180 unsigned long pages = min(pages_left, pages_per_node); 181 uint32_t alignment = mem->page_alignment; 182 unsigned long start; 183 184 if (pages == pages_per_node) 185 alignment = pages_per_node; 186 187 r = drm_mm_insert_node_in_range(mm, &nodes[i], 188 pages, alignment, 0, 189 place->fpfn, lpfn, 190 mode); 191 if (unlikely(r)) 192 goto error; 193 194 usage += nodes[i].size << PAGE_SHIFT; 195 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]); 196 197 /* Calculate a virtual BO start address to easily check if 198 * everything is CPU accessible. 199 */ 200 start = nodes[i].start + nodes[i].size; 201 if (start > mem->num_pages) 202 start -= mem->num_pages; 203 else 204 start = 0; 205 mem->start = max(mem->start, start); 206 pages_left -= pages; 207 } 208 spin_unlock(&mgr->lock); 209 210 atomic64_add(usage, &mgr->usage); 211 atomic64_add(vis_usage, &mgr->vis_usage); 212 213 mem->mm_node = nodes; 214 215 return 0; 216 217 error: 218 while (i--) 219 drm_mm_remove_node(&nodes[i]); 220 spin_unlock(&mgr->lock); 221 222 kvfree(nodes); 223 return r == -ENOSPC ? 0 : r; 224 } 225 226 /** 227 * amdgpu_vram_mgr_del - free ranges 228 * 229 * @man: TTM memory type manager 230 * @tbo: TTM BO we need this range for 231 * @place: placement flags and restrictions 232 * @mem: TTM memory object 233 * 234 * Free the allocated VRAM again. 235 */ 236 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man, 237 struct ttm_mem_reg *mem) 238 { 239 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 240 struct amdgpu_vram_mgr *mgr = man->priv; 241 struct drm_mm_node *nodes = mem->mm_node; 242 uint64_t usage = 0, vis_usage = 0; 243 unsigned pages = mem->num_pages; 244 245 if (!mem->mm_node) 246 return; 247 248 spin_lock(&mgr->lock); 249 while (pages) { 250 pages -= nodes->size; 251 drm_mm_remove_node(nodes); 252 usage += nodes->size << PAGE_SHIFT; 253 vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes); 254 ++nodes; 255 } 256 spin_unlock(&mgr->lock); 257 258 atomic64_sub(usage, &mgr->usage); 259 atomic64_sub(vis_usage, &mgr->vis_usage); 260 261 kvfree(mem->mm_node); 262 mem->mm_node = NULL; 263 } 264 265 /** 266 * amdgpu_vram_mgr_usage - how many bytes are used in this domain 267 * 268 * @man: TTM memory type manager 269 * 270 * Returns how many bytes are used in this domain. 271 */ 272 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man) 273 { 274 struct amdgpu_vram_mgr *mgr = man->priv; 275 276 return atomic64_read(&mgr->usage); 277 } 278 279 /** 280 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part 281 * 282 * @man: TTM memory type manager 283 * 284 * Returns how many bytes are used in the visible part of VRAM 285 */ 286 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man) 287 { 288 struct amdgpu_vram_mgr *mgr = man->priv; 289 290 return atomic64_read(&mgr->vis_usage); 291 } 292 293 /** 294 * amdgpu_vram_mgr_debug - dump VRAM table 295 * 296 * @man: TTM memory type manager 297 * @printer: DRM printer to use 298 * 299 * Dump the table content using printk. 300 */ 301 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man, 302 struct drm_printer *printer) 303 { 304 struct amdgpu_vram_mgr *mgr = man->priv; 305 306 spin_lock(&mgr->lock); 307 drm_mm_print(&mgr->mm, printer); 308 spin_unlock(&mgr->lock); 309 310 drm_printf(printer, "man size:%lu pages, ram usage:%luMB, vis usage:%luMB\n", 311 man->size, amdgpu_vram_mgr_usage(man) >> 20, 312 amdgpu_vram_mgr_vis_usage(man) >> 20); 313 } 314 315 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = { 316 .init = amdgpu_vram_mgr_init, 317 .takedown = amdgpu_vram_mgr_fini, 318 .get_node = amdgpu_vram_mgr_new, 319 .put_node = amdgpu_vram_mgr_del, 320 .debug = amdgpu_vram_mgr_debug 321 }; 322