drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_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 "amdgpu.h"
  26
  27 struct amdgpu_gtt_mgr {
  28         struct drm_mm mm;
  29         spinlock_t lock;
  30         atomic64_t available;
  31 };
  32
  33 struct amdgpu_gtt_node {
  34         struct drm_mm_node node;
  35         struct ttm_buffer_object *tbo;
  36 };
  37
  38 /**
  39  * DOC: mem_info_gtt_total
  40  *
  41  * The amdgpu driver provides a sysfs API for reporting current total size of
  42  * the GTT.
  43  * The file mem_info_gtt_total is used for this, and returns the total size of
  44  * the GTT block, in bytes
  45  */
  46 static ssize_t amdgpu_mem_info_gtt_total_show(struct device *dev,
  47                 struct device_attribute *attr, char *buf)
  48 {
  49         struct drm_device *ddev = dev_get_drvdata(dev);
  50         struct amdgpu_device *adev = ddev->dev_private;
  51
  52         return snprintf(buf, PAGE_SIZE, "%llu\n",
  53                         (adev->mman.bdev.man[TTM_PL_TT].size) * PAGE_SIZE);
  54 }
  55
  56 /**
  57  * DOC: mem_info_gtt_used
  58  *
  59  * The amdgpu driver provides a sysfs API for reporting current total amount of
  60  * used GTT.
  61  * The file mem_info_gtt_used is used for this, and returns the current used
  62  * size of the GTT block, in bytes
  63  */
  64 static ssize_t amdgpu_mem_info_gtt_used_show(struct device *dev,
  65                 struct device_attribute *attr, char *buf)
  66 {
  67         struct drm_device *ddev = dev_get_drvdata(dev);
  68         struct amdgpu_device *adev = ddev->dev_private;
  69
  70         return snprintf(buf, PAGE_SIZE, "%llu\n",
  71                         amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]));
  72 }
  73
  74 static DEVICE_ATTR(mem_info_gtt_total, S_IRUGO,
  75                    amdgpu_mem_info_gtt_total_show, NULL);
  76 static DEVICE_ATTR(mem_info_gtt_used, S_IRUGO,
  77                    amdgpu_mem_info_gtt_used_show, NULL);
  78
  79 /**
  80  * amdgpu_gtt_mgr_init - init GTT manager and DRM MM
  81  *
  82  * @man: TTM memory type manager
  83  * @p_size: maximum size of GTT
  84  *
  85  * Allocate and initialize the GTT manager.
  86  */
  87 static int amdgpu_gtt_mgr_init(struct ttm_mem_type_manager *man,
  88                                unsigned long p_size)
  89 {
  90         struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
  91         struct amdgpu_gtt_mgr *mgr;
  92         uint64_t start, size;
  93         int ret;
  94
  95         mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
  96         if (!mgr)
  97                 return -ENOMEM;
  98
  99         start = AMDGPU_GTT_MAX_TRANSFER_SIZE * AMDGPU_GTT_NUM_TRANSFER_WINDOWS;
 100         size = (adev->gmc.gart_size >> PAGE_SHIFT) - start;
 101         drm_mm_init(&mgr->mm, start, size);
 102         spin_lock_init(&mgr->lock);
 103         atomic64_set(&mgr->available, p_size);
 104         man->priv = mgr;
 105
 106         ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_total);
 107         if (ret) {
 108                 DRM_ERROR("Failed to create device file mem_info_gtt_total\n");
 109                 return ret;
 110         }
 111         ret = device_create_file(adev->dev, &dev_attr_mem_info_gtt_used);
 112         if (ret) {
 113                 DRM_ERROR("Failed to create device file mem_info_gtt_used\n");
 114                 return ret;
 115         }
 116
 117         return 0;
 118 }
 119
 120 /**
 121  * amdgpu_gtt_mgr_fini - free and destroy GTT manager
 122  *
 123  * @man: TTM memory type manager
 124  *
 125  * Destroy and free the GTT manager, returns -EBUSY if ranges are still
 126  * allocated inside it.
 127  */
 128 static int amdgpu_gtt_mgr_fini(struct ttm_mem_type_manager *man)
 129 {
 130         struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 131         struct amdgpu_gtt_mgr *mgr = man->priv;
 132         spin_lock(&mgr->lock);
 133         drm_mm_takedown(&mgr->mm);
 134         spin_unlock(&mgr->lock);
 135         kfree(mgr);
 136         man->priv = NULL;
 137
 138         device_remove_file(adev->dev, &dev_attr_mem_info_gtt_total);
 139         device_remove_file(adev->dev, &dev_attr_mem_info_gtt_used);
 140
 141         return 0;
 142 }
 143
 144 /**
 145  * amdgpu_gtt_mgr_has_gart_addr - Check if mem has address space
 146  *
 147  * @mem: the mem object to check
 148  *
 149  * Check if a mem object has already address space allocated.
 150  */
 151 bool amdgpu_gtt_mgr_has_gart_addr(struct ttm_mem_reg *mem)
 152 {
 153         struct amdgpu_gtt_node *node = mem->mm_node;
 154
 155         return (node->node.start != AMDGPU_BO_INVALID_OFFSET);
 156 }
 157
 158 /**
 159  * amdgpu_gtt_mgr_alloc - allocate new ranges
 160  *
 161  * @man: TTM memory type manager
 162  * @tbo: TTM BO we need this range for
 163  * @place: placement flags and restrictions
 164  * @mem: the resulting mem object
 165  *
 166  * Allocate the address space for a node.
 167  */
 168 static int amdgpu_gtt_mgr_alloc(struct ttm_mem_type_manager *man,
 169                                 struct ttm_buffer_object *tbo,
 170                                 const struct ttm_place *place,
 171                                 struct ttm_mem_reg *mem)
 172 {
 173         struct amdgpu_device *adev = amdgpu_ttm_adev(man->bdev);
 174         struct amdgpu_gtt_mgr *mgr = man->priv;
 175         struct amdgpu_gtt_node *node = mem->mm_node;
 176         enum drm_mm_insert_mode mode;
 177         unsigned long fpfn, lpfn;
 178         int r;
 179
 180         if (amdgpu_gtt_mgr_has_gart_addr(mem))
 181                 return 0;
 182
 183         if (place)
 184                 fpfn = place->fpfn;
 185         else
 186                 fpfn = 0;
 187
 188         if (place && place->lpfn)
 189                 lpfn = place->lpfn;
 190         else
 191                 lpfn = adev->gart.num_cpu_pages;
 192
 193         mode = DRM_MM_INSERT_BEST;
 194         if (place && place->flags & TTM_PL_FLAG_TOPDOWN)
 195                 mode = DRM_MM_INSERT_HIGH;
 196
 197         spin_lock(&mgr->lock);
 198         r = drm_mm_insert_node_in_range(&mgr->mm, &node->node, mem->num_pages,
 199                                         mem->page_alignment, 0, fpfn, lpfn,
 200                                         mode);
 201         spin_unlock(&mgr->lock);
 202
 203         if (!r)
 204                 mem->start = node->node.start;
 205
 206         return r;
 207 }
 208
 209 /**
 210  * amdgpu_gtt_mgr_new - allocate a new node
 211  *
 212  * @man: TTM memory type manager
 213  * @tbo: TTM BO we need this range for
 214  * @place: placement flags and restrictions
 215  * @mem: the resulting mem object
 216  *
 217  * Dummy, allocate the node but no space for it yet.
 218  */
 219 static int amdgpu_gtt_mgr_new(struct ttm_mem_type_manager *man,
 220                               struct ttm_buffer_object *tbo,
 221                               const struct ttm_place *place,
 222                               struct ttm_mem_reg *mem)
 223 {
 224         struct amdgpu_gtt_mgr *mgr = man->priv;
 225         struct amdgpu_gtt_node *node;
 226         int r;
 227
 228         spin_lock(&mgr->lock);
 229         if ((&tbo->mem == mem || tbo->mem.mem_type != TTM_PL_TT) &&
 230             atomic64_read(&mgr->available) < mem->num_pages) {
 231                 spin_unlock(&mgr->lock);
 232                 return 0;
 233         }
 234         atomic64_sub(mem->num_pages, &mgr->available);
 235         spin_unlock(&mgr->lock);
 236
 237         node = kzalloc(sizeof(*node), GFP_KERNEL);
 238         if (!node) {
 239                 r = -ENOMEM;
 240                 goto err_out;
 241         }
 242
 243         node->node.start = AMDGPU_BO_INVALID_OFFSET;
 244         node->node.size = mem->num_pages;
 245         node->tbo = tbo;
 246         mem->mm_node = node;
 247
 248         if (place->fpfn || place->lpfn || place->flags & TTM_PL_FLAG_TOPDOWN) {
 249                 r = amdgpu_gtt_mgr_alloc(man, tbo, place, mem);
 250                 if (unlikely(r)) {
 251                         kfree(node);
 252                         mem->mm_node = NULL;
 253                         r = 0;
 254                         goto err_out;
 255                 }
 256         } else {
 257                 mem->start = node->node.start;
 258         }
 259
 260         return 0;
 261 err_out:
 262         atomic64_add(mem->num_pages, &mgr->available);
 263
 264         return r;
 265 }
 266
 267 /**
 268  * amdgpu_gtt_mgr_del - free ranges
 269  *
 270  * @man: TTM memory type manager
 271  * @tbo: TTM BO we need this range for
 272  * @place: placement flags and restrictions
 273  * @mem: TTM memory object
 274  *
 275  * Free the allocated GTT again.
 276  */
 277 static void amdgpu_gtt_mgr_del(struct ttm_mem_type_manager *man,
 278                                struct ttm_mem_reg *mem)
 279 {
 280         struct amdgpu_gtt_mgr *mgr = man->priv;
 281         struct amdgpu_gtt_node *node = mem->mm_node;
 282
 283         if (!node)
 284                 return;
 285
 286         spin_lock(&mgr->lock);
 287         if (node->node.start != AMDGPU_BO_INVALID_OFFSET)
 288                 drm_mm_remove_node(&node->node);
 289         spin_unlock(&mgr->lock);
 290         atomic64_add(mem->num_pages, &mgr->available);
 291
 292         kfree(node);
 293         mem->mm_node = NULL;
 294 }
 295
 296 /**
 297  * amdgpu_gtt_mgr_usage - return usage of GTT domain
 298  *
 299  * @man: TTM memory type manager
 300  *
 301  * Return how many bytes are used in the GTT domain
 302  */
 303 uint64_t amdgpu_gtt_mgr_usage(struct ttm_mem_type_manager *man)
 304 {
 305         struct amdgpu_gtt_mgr *mgr = man->priv;
 306         s64 result = man->size - atomic64_read(&mgr->available);
 307
 308         return (result > 0 ? result : 0) * PAGE_SIZE;
 309 }
 310
 311 int amdgpu_gtt_mgr_recover(struct ttm_mem_type_manager *man)
 312 {
 313         struct amdgpu_gtt_mgr *mgr = man->priv;
 314         struct amdgpu_gtt_node *node;
 315         struct drm_mm_node *mm_node;
 316         int r = 0;
 317
 318         spin_lock(&mgr->lock);
 319         drm_mm_for_each_node(mm_node, &mgr->mm) {
 320                 node = container_of(mm_node, struct amdgpu_gtt_node, node);
 321                 r = amdgpu_ttm_recover_gart(node->tbo);
 322                 if (r)
 323                         break;
 324         }
 325         spin_unlock(&mgr->lock);
 326
 327         return r;
 328 }
 329
 330 /**
 331  * amdgpu_gtt_mgr_debug - dump VRAM table
 332  *
 333  * @man: TTM memory type manager
 334  * @printer: DRM printer to use
 335  *
 336  * Dump the table content using printk.
 337  */
 338 static void amdgpu_gtt_mgr_debug(struct ttm_mem_type_manager *man,
 339                                  struct drm_printer *printer)
 340 {
 341         struct amdgpu_gtt_mgr *mgr = man->priv;
 342
 343         spin_lock(&mgr->lock);
 344         drm_mm_print(&mgr->mm, printer);
 345         spin_unlock(&mgr->lock);
 346
 347         drm_printf(printer, "man size:%llu pages, gtt available:%lld pages, usage:%lluMB\n",
 348                    man->size, (u64)atomic64_read(&mgr->available),
 349                    amdgpu_gtt_mgr_usage(man) >> 20);
 350 }
 351
 352 const struct ttm_mem_type_manager_func amdgpu_gtt_mgr_func = {
 353         .init = amdgpu_gtt_mgr_init,
 354         .takedown = amdgpu_gtt_mgr_fini,
 355         .get_node = amdgpu_gtt_mgr_new,
 356         .put_node = amdgpu_gtt_mgr_del,
 357         .debug = amdgpu_gtt_mgr_debug
 358 };