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