drivers/gpu/drm/virtio/virtgpu_ttm.c

   1 /*
   2  * Copyright (C) 2015 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Authors:
   6  *    Dave Airlie
   7  *    Alon Levy
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  * OTHER DEALINGS IN THE SOFTWARE.
  26  */
  27
  28 #include <ttm/ttm_bo_api.h>
  29 #include <ttm/ttm_bo_driver.h>
  30 #include <ttm/ttm_placement.h>
  31 #include <ttm/ttm_page_alloc.h>
  32 #include <ttm/ttm_module.h>
  33 #include <drm/drmP.h>
  34 #include <drm/drm.h>
  35 #include <drm/virtgpu_drm.h>
  36 #include "virtgpu_drv.h"
  37
  38 #include <linux/delay.h>
  39
  40 #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
  41
  42 static struct
  43 virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
  44 {
  45         struct virtio_gpu_mman *mman;
  46         struct virtio_gpu_device *vgdev;
  47
  48         mman = container_of(bdev, struct virtio_gpu_mman, bdev);
  49         vgdev = container_of(mman, struct virtio_gpu_device, mman);
  50         return vgdev;
  51 }
  52
  53 static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
  54 {
  55         return ttm_mem_global_init(ref->object);
  56 }
  57
  58 static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
  59 {
  60         ttm_mem_global_release(ref->object);
  61 }
  62
  63 static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
  64 {
  65         struct drm_global_reference *global_ref;
  66         int r;
  67
  68         vgdev->mman.mem_global_referenced = false;
  69         global_ref = &vgdev->mman.mem_global_ref;
  70         global_ref->global_type = DRM_GLOBAL_TTM_MEM;
  71         global_ref->size = sizeof(struct ttm_mem_global);
  72         global_ref->init = &virtio_gpu_ttm_mem_global_init;
  73         global_ref->release = &virtio_gpu_ttm_mem_global_release;
  74
  75         r = drm_global_item_ref(global_ref);
  76         if (r != 0) {
  77                 DRM_ERROR("Failed setting up TTM memory accounting "
  78                           "subsystem.\n");
  79                 return r;
  80         }
  81
  82         vgdev->mman.bo_global_ref.mem_glob =
  83                 vgdev->mman.mem_global_ref.object;
  84         global_ref = &vgdev->mman.bo_global_ref.ref;
  85         global_ref->global_type = DRM_GLOBAL_TTM_BO;
  86         global_ref->size = sizeof(struct ttm_bo_global);
  87         global_ref->init = &ttm_bo_global_init;
  88         global_ref->release = &ttm_bo_global_release;
  89         r = drm_global_item_ref(global_ref);
  90         if (r != 0) {
  91                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
  92                 drm_global_item_unref(&vgdev->mman.mem_global_ref);
  93                 return r;
  94         }
  95
  96         vgdev->mman.mem_global_referenced = true;
  97         return 0;
  98 }
  99
 100 static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
 101 {
 102         if (vgdev->mman.mem_global_referenced) {
 103                 drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
 104                 drm_global_item_unref(&vgdev->mman.mem_global_ref);
 105                 vgdev->mman.mem_global_referenced = false;
 106         }
 107 }
 108
 109 #if 0
 110 /*
 111  * Hmm, seems to not do anything useful.  Leftover debug hack?
 112  * Something like printing pagefaults to kernel log?
 113  */
 114 static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
 115 static const struct vm_operations_struct *ttm_vm_ops;
 116
 117 static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
 118                                 struct vm_fault *vmf)
 119 {
 120         struct ttm_buffer_object *bo;
 121         struct virtio_gpu_device *vgdev;
 122         int r;
 123
 124         bo = (struct ttm_buffer_object *)vma->vm_private_data;
 125         if (bo == NULL)
 126                 return VM_FAULT_NOPAGE;
 127         vgdev = virtio_gpu_get_vgdev(bo->bdev);
 128         r = ttm_vm_ops->fault(vma, vmf);
 129         return r;
 130 }
 131 #endif
 132
 133 int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
 134 {
 135         struct drm_file *file_priv;
 136         struct virtio_gpu_device *vgdev;
 137         int r;
 138
 139         file_priv = filp->private_data;
 140         vgdev = file_priv->minor->dev->dev_private;
 141         if (vgdev == NULL) {
 142                 DRM_ERROR(
 143                  "filp->private_data->minor->dev->dev_private == NULL\n");
 144                 return -EINVAL;
 145         }
 146         r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
 147 #if 0
 148         if (unlikely(r != 0))
 149                 return r;
 150         if (unlikely(ttm_vm_ops == NULL)) {
 151                 ttm_vm_ops = vma->vm_ops;
 152                 virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
 153                 virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
 154         }
 155         vma->vm_ops = &virtio_gpu_ttm_vm_ops;
 156         return 0;
 157 #else
 158         return r;
 159 #endif
 160 }
 161
 162 static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
 163                                         uint32_t flags)
 164 {
 165         return 0;
 166 }
 167
 168 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
 169                                struct ttm_buffer_object *bo,
 170                                const struct ttm_place *place,
 171                                struct ttm_mem_reg *mem)
 172 {
 173         mem->mm_node = (void *)1;
 174         return 0;
 175 }
 176
 177 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
 178                                 struct ttm_mem_reg *mem)
 179 {
 180         mem->mm_node = (void *)NULL;
 181         return;
 182 }
 183
 184 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 185                            unsigned long p_size)
 186 {
 187         return 0;
 188 }
 189
 190 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 191 {
 192         return 0;
 193 }
 194
 195 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 196                              const char *prefix)
 197 {
 198 }
 199
 200 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
 201         ttm_bo_man_init,
 202         ttm_bo_man_takedown,
 203         ttm_bo_man_get_node,
 204         ttm_bo_man_put_node,
 205         ttm_bo_man_debug
 206 };
 207
 208 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 209                                     struct ttm_mem_type_manager *man)
 210 {
 211         struct virtio_gpu_device *vgdev;
 212
 213         vgdev = virtio_gpu_get_vgdev(bdev);
 214
 215         switch (type) {
 216         case TTM_PL_SYSTEM:
 217                 /* System memory */
 218                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 219                 man->available_caching = TTM_PL_MASK_CACHING;
 220                 man->default_caching = TTM_PL_FLAG_CACHED;
 221                 break;
 222         case TTM_PL_TT:
 223                 man->func = &virtio_gpu_bo_manager_func;
 224                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 225                 man->available_caching = TTM_PL_MASK_CACHING;
 226                 man->default_caching = TTM_PL_FLAG_CACHED;
 227                 break;
 228         default:
 229                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 230                 return -EINVAL;
 231         }
 232         return 0;
 233 }
 234
 235 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
 236                                 struct ttm_placement *placement)
 237 {
 238         static struct ttm_place placements = {
 239                 .fpfn  = 0,
 240                 .lpfn  = 0,
 241                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
 242         };
 243
 244         placement->placement = &placements;
 245         placement->busy_placement = &placements;
 246         placement->num_placement = 1;
 247         placement->num_busy_placement = 1;
 248         return;
 249 }
 250
 251 static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
 252                                     struct file *filp)
 253 {
 254         return 0;
 255 }
 256
 257 static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 258                                          struct ttm_mem_reg *mem)
 259 {
 260         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 261
 262         mem->bus.addr = NULL;
 263         mem->bus.offset = 0;
 264         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 265         mem->bus.base = 0;
 266         mem->bus.is_iomem = false;
 267         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 268                 return -EINVAL;
 269         switch (mem->mem_type) {
 270         case TTM_PL_SYSTEM:
 271         case TTM_PL_TT:
 272                 /* system memory */
 273                 return 0;
 274         default:
 275                 return -EINVAL;
 276         }
 277         return 0;
 278 }
 279
 280 static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
 281                                        struct ttm_mem_reg *mem)
 282 {
 283 }
 284
 285 /*
 286  * TTM backend functions.
 287  */
 288 struct virtio_gpu_ttm_tt {
 289         struct ttm_dma_tt               ttm;
 290         struct virtio_gpu_device        *vgdev;
 291         u64                             offset;
 292 };
 293
 294 static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
 295                                        struct ttm_mem_reg *bo_mem)
 296 {
 297         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 298
 299         gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 300         if (!ttm->num_pages)
 301                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 302                      ttm->num_pages, bo_mem, ttm);
 303
 304         /* Not implemented */
 305         return 0;
 306 }
 307
 308 static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
 309 {
 310         /* Not implemented */
 311         return 0;
 312 }
 313
 314 static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
 315 {
 316         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 317
 318         ttm_dma_tt_fini(&gtt->ttm);
 319         kfree(gtt);
 320 }
 321
 322 static struct ttm_backend_func virtio_gpu_backend_func = {
 323         .bind = &virtio_gpu_ttm_backend_bind,
 324         .unbind = &virtio_gpu_ttm_backend_unbind,
 325         .destroy = &virtio_gpu_ttm_backend_destroy,
 326 };
 327
 328 static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
 329 {
 330         if (ttm->state != tt_unpopulated)
 331                 return 0;
 332
 333         return ttm_pool_populate(ttm);
 334 }
 335
 336 static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
 337 {
 338         ttm_pool_unpopulate(ttm);
 339 }
 340
 341 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
 342                                                unsigned long size,
 343                                                uint32_t page_flags,
 344                                                struct page *dummy_read_page)
 345 {
 346         struct virtio_gpu_device *vgdev;
 347         struct virtio_gpu_ttm_tt *gtt;
 348
 349         vgdev = virtio_gpu_get_vgdev(bdev);
 350         gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
 351         if (gtt == NULL)
 352                 return NULL;
 353         gtt->ttm.ttm.func = &virtio_gpu_backend_func;
 354         gtt->vgdev = vgdev;
 355         if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
 356                             dummy_read_page)) {
 357                 kfree(gtt);
 358                 return NULL;
 359         }
 360         return &gtt->ttm.ttm;
 361 }
 362
 363 static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
 364                                  struct ttm_mem_reg *new_mem)
 365 {
 366         struct ttm_mem_reg *old_mem = &bo->mem;
 367
 368         BUG_ON(old_mem->mm_node != NULL);
 369         *old_mem = *new_mem;
 370         new_mem->mm_node = NULL;
 371 }
 372
 373 static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
 374                               bool evict, bool interruptible,
 375                               bool no_wait_gpu,
 376                               struct ttm_mem_reg *new_mem)
 377 {
 378         virtio_gpu_move_null(bo, new_mem);
 379         return 0;
 380 }
 381
 382 static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
 383                                       struct ttm_mem_reg *new_mem)
 384 {
 385         struct virtio_gpu_object *bo;
 386         struct virtio_gpu_device *vgdev;
 387
 388         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 389         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 390
 391         if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
 392                 if (bo->hw_res_handle)
 393                         virtio_gpu_cmd_resource_inval_backing(vgdev,
 394                                                            bo->hw_res_handle);
 395
 396         } else if (new_mem->placement & TTM_PL_FLAG_TT) {
 397                 if (bo->hw_res_handle) {
 398                         virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
 399                                                  NULL);
 400                 }
 401         }
 402 }
 403
 404 static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
 405 {
 406         struct virtio_gpu_object *bo;
 407         struct virtio_gpu_device *vgdev;
 408
 409         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 410         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 411
 412         if (bo->pages)
 413                 virtio_gpu_object_free_sg_table(bo);
 414 }
 415
 416 static struct ttm_bo_driver virtio_gpu_bo_driver = {
 417         .ttm_tt_create = &virtio_gpu_ttm_tt_create,
 418         .ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
 419         .ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
 420         .invalidate_caches = &virtio_gpu_invalidate_caches,
 421         .init_mem_type = &virtio_gpu_init_mem_type,
 422         .evict_flags = &virtio_gpu_evict_flags,
 423         .move = &virtio_gpu_bo_move,
 424         .verify_access = &virtio_gpu_verify_access,
 425         .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
 426         .io_mem_free = &virtio_gpu_ttm_io_mem_free,
 427         .move_notify = &virtio_gpu_bo_move_notify,
 428         .swap_notify = &virtio_gpu_bo_swap_notify,
 429         .lru_tail = &ttm_bo_default_lru_tail,
 430         .swap_lru_tail = &ttm_bo_default_swap_lru_tail,
 431 };
 432
 433 int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 434 {
 435         int r;
 436
 437         r = virtio_gpu_ttm_global_init(vgdev);
 438         if (r)
 439                 return r;
 440         /* No others user of address space so set it to 0 */
 441         r = ttm_bo_device_init(&vgdev->mman.bdev,
 442                                vgdev->mman.bo_global_ref.ref.object,
 443                                &virtio_gpu_bo_driver,
 444                                vgdev->ddev->anon_inode->i_mapping,
 445                                DRM_FILE_PAGE_OFFSET, 0);
 446         if (r) {
 447                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 448                 goto err_dev_init;
 449         }
 450
 451         r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
 452         if (r) {
 453                 DRM_ERROR("Failed initializing GTT heap.\n");
 454                 goto err_mm_init;
 455         }
 456         return 0;
 457
 458 err_mm_init:
 459         ttm_bo_device_release(&vgdev->mman.bdev);
 460 err_dev_init:
 461         virtio_gpu_ttm_global_fini(vgdev);
 462         return r;
 463 }
 464
 465 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
 466 {
 467         ttm_bo_device_release(&vgdev->mman.bdev);
 468         virtio_gpu_ttm_global_fini(vgdev);
 469         DRM_INFO("virtio_gpu: ttm finalized\n");
 470 }