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