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 spinlock_t 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_lock_init(&mgr->lock); 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->mc.visible_vram_size) 93 return 0; 94 95 return (end > adev->mc.visible_vram_size ? 96 adev->mc.visible_vram_size : end) - start; 97 } 98 99 /** 100 * amdgpu_vram_mgr_new - allocate new ranges 101 * 102 * @man: TTM memory type manager 103 * @tbo: TTM BO we need this range for 104 * @place: placement flags and restrictions 105 * @mem: the resulting mem object 106 * 107 * Allocate VRAM for the given BO. 108 */ 109 static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man, 110 struct ttm_buffer_object *tbo, 111 const struct ttm_place *place, 112 struct ttm_mem_reg *mem) 113 { 114 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 115 struct amdgpu_vram_mgr *mgr = man->priv; 116 struct drm_mm *mm = &mgr->mm; 117 struct drm_mm_node *nodes; 118 enum drm_mm_insert_mode mode; 119 unsigned long lpfn, num_nodes, pages_per_node, pages_left; 120 uint64_t usage = 0, vis_usage = 0; 121 unsigned i; 122 int r; 123 124 lpfn = place->lpfn; 125 if (!lpfn) 126 lpfn = man->size; 127 128 if (place->flags & TTM_PL_FLAG_CONTIGUOUS || 129 amdgpu_vram_page_split == -1) { 130 pages_per_node = ~0ul; 131 num_nodes = 1; 132 } else { 133 pages_per_node = max((uint32_t)amdgpu_vram_page_split, 134 mem->page_alignment); 135 num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node); 136 } 137 138 nodes = kcalloc(num_nodes, sizeof(*nodes), GFP_KERNEL); 139 if (!nodes) 140 return -ENOMEM; 141 142 mode = DRM_MM_INSERT_BEST; 143 if (place->flags & TTM_PL_FLAG_TOPDOWN) 144 mode = DRM_MM_INSERT_HIGH; 145 146 mem->start = 0; 147 pages_left = mem->num_pages; 148 149 spin_lock(&mgr->lock); 150 for (i = 0; i < num_nodes; ++i) { 151 unsigned long pages = min(pages_left, pages_per_node); 152 uint32_t alignment = mem->page_alignment; 153 unsigned long start; 154 155 if (pages == pages_per_node) 156 alignment = pages_per_node; 157 158 r = drm_mm_insert_node_in_range(mm, &nodes[i], 159 pages, alignment, 0, 160 place->fpfn, lpfn, 161 mode); 162 if (unlikely(r)) 163 goto error; 164 165 usage += nodes[i].size << PAGE_SHIFT; 166 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]); 167 168 /* Calculate a virtual BO start address to easily check if 169 * everything is CPU accessible. 170 */ 171 start = nodes[i].start + nodes[i].size; 172 if (start > mem->num_pages) 173 start -= mem->num_pages; 174 else 175 start = 0; 176 mem->start = max(mem->start, start); 177 pages_left -= pages; 178 } 179 spin_unlock(&mgr->lock); 180 181 atomic64_add(usage, &mgr->usage); 182 atomic64_add(vis_usage, &mgr->vis_usage); 183 184 mem->mm_node = nodes; 185 186 return 0; 187 188 error: 189 while (i--) 190 drm_mm_remove_node(&nodes[i]); 191 spin_unlock(&mgr->lock); 192 193 kfree(nodes); 194 return r == -ENOSPC ? 0 : r; 195 } 196 197 /** 198 * amdgpu_vram_mgr_del - free ranges 199 * 200 * @man: TTM memory type manager 201 * @tbo: TTM BO we need this range for 202 * @place: placement flags and restrictions 203 * @mem: TTM memory object 204 * 205 * Free the allocated VRAM again. 206 */ 207 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man, 208 struct ttm_mem_reg *mem) 209 { 210 struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev); 211 struct amdgpu_vram_mgr *mgr = man->priv; 212 struct drm_mm_node *nodes = mem->mm_node; 213 uint64_t usage = 0, vis_usage = 0; 214 unsigned pages = mem->num_pages; 215 216 if (!mem->mm_node) 217 return; 218 219 spin_lock(&mgr->lock); 220 while (pages) { 221 pages -= nodes->size; 222 drm_mm_remove_node(nodes); 223 usage += nodes->size << PAGE_SHIFT; 224 vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes); 225 ++nodes; 226 } 227 spin_unlock(&mgr->lock); 228 229 atomic64_sub(usage, &mgr->usage); 230 atomic64_sub(vis_usage, &mgr->vis_usage); 231 232 kfree(mem->mm_node); 233 mem->mm_node = NULL; 234 } 235 236 /** 237 * amdgpu_vram_mgr_usage - how many bytes are used in this domain 238 * 239 * @man: TTM memory type manager 240 * 241 * Returns how many bytes are used in this domain. 242 */ 243 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man) 244 { 245 struct amdgpu_vram_mgr *mgr = man->priv; 246 247 return atomic64_read(&mgr->usage); 248 } 249 250 /** 251 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part 252 * 253 * @man: TTM memory type manager 254 * 255 * Returns how many bytes are used in the visible part of VRAM 256 */ 257 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man) 258 { 259 struct amdgpu_vram_mgr *mgr = man->priv; 260 261 return atomic64_read(&mgr->vis_usage); 262 } 263 264 /** 265 * amdgpu_vram_mgr_debug - dump VRAM table 266 * 267 * @man: TTM memory type manager 268 * @printer: DRM printer to use 269 * 270 * Dump the table content using printk. 271 */ 272 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man, 273 struct drm_printer *printer) 274 { 275 struct amdgpu_vram_mgr *mgr = man->priv; 276 277 spin_lock(&mgr->lock); 278 drm_mm_print(&mgr->mm, printer); 279 spin_unlock(&mgr->lock); 280 281 drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n", 282 man->size, amdgpu_vram_mgr_usage(man) >> 20, 283 amdgpu_vram_mgr_vis_usage(man) >> 20); 284 } 285 286 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = { 287 .init = amdgpu_vram_mgr_init, 288 .takedown = amdgpu_vram_mgr_fini, 289 .get_node = amdgpu_vram_mgr_new, 290 .put_node = amdgpu_vram_mgr_del, 291 .debug = amdgpu_vram_mgr_debug 292 }; 293