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