drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

   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->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_virt_start - update virtual start address
 129  *
 130  * @mem: ttm_mem_reg to update
 131  * @node: just allocated node
 132  *
 133  * Calculate a virtual BO start address to easily check if everything is CPU
 134  * accessible.
 135  */
 136 static void amdgpu_vram_mgr_virt_start(struct ttm_mem_reg *mem,
 137                                        struct drm_mm_node *node)
 138 {
 139         unsigned long start;
 140
 141         start = node->start + node->size;
 142         if (start > mem->num_pages)
 143                 start -= mem->num_pages;
 144         else
 145                 start = 0;
 146         mem->start = max(mem->start, start);
 147 }
 148
 149 /**
 150  * amdgpu_vram_mgr_new - allocate new ranges
 151  *
 152  * @man: TTM memory type manager
 153  * @tbo: TTM BO we need this range for
 154  * @place: placement flags and restrictions
 155  * @mem: the resulting mem object
 156  *
 157  * Allocate VRAM for the given BO.
 158  */
 159 static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
 160                                struct ttm_buffer_object *tbo,
 161                                const struct ttm_place *place,
 162                                struct ttm_mem_reg *mem)
 163 {
 164         struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 165         struct amdgpu_vram_mgr *mgr = man->priv;
 166         struct drm_mm *mm = &mgr->mm;
 167         struct drm_mm_node *nodes;
 168         enum drm_mm_insert_mode mode;
 169         unsigned long lpfn, num_nodes, pages_per_node, pages_left;
 170         uint64_t usage = 0, vis_usage = 0;
 171         unsigned i;
 172         int r;
 173
 174         lpfn = place->lpfn;
 175         if (!lpfn)
 176                 lpfn = man->size;
 177
 178         if (place->flags & TTM_PL_FLAG_CONTIGUOUS ||
 179             amdgpu_vram_page_split == -1) {
 180                 pages_per_node = ~0ul;
 181                 num_nodes = 1;
 182         } else {
 183                 pages_per_node = max((uint32_t)amdgpu_vram_page_split,
 184                                      mem->page_alignment);
 185                 num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
 186         }
 187
 188         nodes = kvmalloc_array(num_nodes, sizeof(*nodes),
 189                                GFP_KERNEL | __GFP_ZERO);
 190         if (!nodes)
 191                 return -ENOMEM;
 192
 193         mode = DRM_MM_INSERT_BEST;
 194         if (place->flags & TTM_PL_FLAG_TOPDOWN)
 195                 mode = DRM_MM_INSERT_HIGH;
 196
 197         mem->start = 0;
 198         pages_left = mem->num_pages;
 199
 200         spin_lock(&mgr->lock);
 201         for (i = 0; pages_left >= pages_per_node; ++i) {
 202                 unsigned long pages = rounddown_pow_of_two(pages_left);
 203
 204                 r = drm_mm_insert_node_in_range(mm, &nodes[i], pages,
 205                                                 pages_per_node, 0,
 206                                                 place->fpfn, lpfn,
 207                                                 mode);
 208                 if (unlikely(r))
 209                         break;
 210
 211                 usage += nodes[i].size << PAGE_SHIFT;
 212                 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
 213                 amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
 214                 pages_left -= pages;
 215         }
 216
 217         for (; pages_left; ++i) {
 218                 unsigned long pages = min(pages_left, pages_per_node);
 219                 uint32_t alignment = mem->page_alignment;
 220
 221                 if (pages == pages_per_node)
 222                         alignment = pages_per_node;
 223
 224                 r = drm_mm_insert_node_in_range(mm, &nodes[i],
 225                                                 pages, alignment, 0,
 226                                                 place->fpfn, lpfn,
 227                                                 mode);
 228                 if (unlikely(r))
 229                         goto error;
 230
 231                 usage += nodes[i].size << PAGE_SHIFT;
 232                 vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
 233                 amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
 234                 pages_left -= pages;
 235         }
 236         spin_unlock(&mgr->lock);
 237
 238         atomic64_add(usage, &mgr->usage);
 239         atomic64_add(vis_usage, &mgr->vis_usage);
 240
 241         mem->mm_node = nodes;
 242
 243         return 0;
 244
 245 error:
 246         while (i--)
 247                 drm_mm_remove_node(&nodes[i]);
 248         spin_unlock(&mgr->lock);
 249
 250         kvfree(nodes);
 251         return r == -ENOSPC ? 0 : r;
 252 }
 253
 254 /**
 255  * amdgpu_vram_mgr_del - free ranges
 256  *
 257  * @man: TTM memory type manager
 258  * @tbo: TTM BO we need this range for
 259  * @place: placement flags and restrictions
 260  * @mem: TTM memory object
 261  *
 262  * Free the allocated VRAM again.
 263  */
 264 static void amdgpu_vram_mgr_del(struct ttm_mem_type_manager *man,
 265                                 struct ttm_mem_reg *mem)
 266 {
 267         struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 268         struct amdgpu_vram_mgr *mgr = man->priv;
 269         struct drm_mm_node *nodes = mem->mm_node;
 270         uint64_t usage = 0, vis_usage = 0;
 271         unsigned pages = mem->num_pages;
 272
 273         if (!mem->mm_node)
 274                 return;
 275
 276         spin_lock(&mgr->lock);
 277         while (pages) {
 278                 pages -= nodes->size;
 279                 drm_mm_remove_node(nodes);
 280                 usage += nodes->size << PAGE_SHIFT;
 281                 vis_usage += amdgpu_vram_mgr_vis_size(adev, nodes);
 282                 ++nodes;
 283         }
 284         spin_unlock(&mgr->lock);
 285
 286         atomic64_sub(usage, &mgr->usage);
 287         atomic64_sub(vis_usage, &mgr->vis_usage);
 288
 289         kvfree(mem->mm_node);
 290         mem->mm_node = NULL;
 291 }
 292
 293 /**
 294  * amdgpu_vram_mgr_usage - how many bytes are used in this domain
 295  *
 296  * @man: TTM memory type manager
 297  *
 298  * Returns how many bytes are used in this domain.
 299  */
 300 uint64_t amdgpu_vram_mgr_usage(struct ttm_mem_type_manager *man)
 301 {
 302         struct amdgpu_vram_mgr *mgr = man->priv;
 303
 304         return atomic64_read(&mgr->usage);
 305 }
 306
 307 /**
 308  * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
 309  *
 310  * @man: TTM memory type manager
 311  *
 312  * Returns how many bytes are used in the visible part of VRAM
 313  */
 314 uint64_t amdgpu_vram_mgr_vis_usage(struct ttm_mem_type_manager *man)
 315 {
 316         struct amdgpu_vram_mgr *mgr = man->priv;
 317
 318         return atomic64_read(&mgr->vis_usage);
 319 }
 320
 321 /**
 322  * amdgpu_vram_mgr_debug - dump VRAM table
 323  *
 324  * @man: TTM memory type manager
 325  * @printer: DRM printer to use
 326  *
 327  * Dump the table content using printk.
 328  */
 329 static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
 330                                   struct drm_printer *printer)
 331 {
 332         struct amdgpu_vram_mgr *mgr = man->priv;
 333
 334         spin_lock(&mgr->lock);
 335         drm_mm_print(&mgr->mm, printer);
 336         spin_unlock(&mgr->lock);
 337
 338         drm_printf(printer, "man size:%llu pages, ram usage:%lluMB, vis usage:%lluMB\n",
 339                    man->size, amdgpu_vram_mgr_usage(man) >> 20,
 340                    amdgpu_vram_mgr_vis_usage(man) >> 20);
 341 }
 342
 343 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
 344         .init           = amdgpu_vram_mgr_init,
 345         .takedown       = amdgpu_vram_mgr_fini,
 346         .get_node       = amdgpu_vram_mgr_new,
 347         .put_node       = amdgpu_vram_mgr_del,
 348         .debug          = amdgpu_vram_mgr_debug
 349 };