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_fault *vmf)
 118 {
 119         struct ttm_buffer_object *bo;
 120         struct virtio_gpu_device *vgdev;
 121         int r;
 122
 123         bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
 124         if (bo == NULL)
 125                 return VM_FAULT_NOPAGE;
 126         vgdev = virtio_gpu_get_vgdev(bo->bdev);
 127         r = ttm_vm_ops->fault(vmf);
 128         return r;
 129 }
 130 #endif
 131
 132 int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
 133 {
 134         struct drm_file *file_priv;
 135         struct virtio_gpu_device *vgdev;
 136         int r;
 137
 138         file_priv = filp->private_data;
 139         vgdev = file_priv->minor->dev->dev_private;
 140         if (vgdev == NULL) {
 141                 DRM_ERROR(
 142                  "filp->private_data->minor->dev->dev_private == NULL\n");
 143                 return -EINVAL;
 144         }
 145         r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
 146 #if 0
 147         if (unlikely(r != 0))
 148                 return r;
 149         if (unlikely(ttm_vm_ops == NULL)) {
 150                 ttm_vm_ops = vma->vm_ops;
 151                 virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
 152                 virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
 153         }
 154         vma->vm_ops = &virtio_gpu_ttm_vm_ops;
 155         return 0;
 156 #else
 157         return r;
 158 #endif
 159 }
 160
 161 static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
 162                                         uint32_t flags)
 163 {
 164         return 0;
 165 }
 166
 167 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
 168                                struct ttm_buffer_object *bo,
 169                                const struct ttm_place *place,
 170                                struct ttm_mem_reg *mem)
 171 {
 172         mem->mm_node = (void *)1;
 173         return 0;
 174 }
 175
 176 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
 177                                 struct ttm_mem_reg *mem)
 178 {
 179         mem->mm_node = (void *)NULL;
 180         return;
 181 }
 182
 183 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 184                            unsigned long p_size)
 185 {
 186         return 0;
 187 }
 188
 189 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 190 {
 191         return 0;
 192 }
 193
 194 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 195                              const char *prefix)
 196 {
 197 }
 198
 199 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
 200         .init = ttm_bo_man_init,
 201         .takedown = ttm_bo_man_takedown,
 202         .get_node = ttm_bo_man_get_node,
 203         .put_node = ttm_bo_man_put_node,
 204         .debug = ttm_bo_man_debug
 205 };
 206
 207 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 208                                     struct ttm_mem_type_manager *man)
 209 {
 210         struct virtio_gpu_device *vgdev;
 211
 212         vgdev = virtio_gpu_get_vgdev(bdev);
 213
 214         switch (type) {
 215         case TTM_PL_SYSTEM:
 216                 /* System memory */
 217                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 218                 man->available_caching = TTM_PL_MASK_CACHING;
 219                 man->default_caching = TTM_PL_FLAG_CACHED;
 220                 break;
 221         case TTM_PL_TT:
 222                 man->func = &virtio_gpu_bo_manager_func;
 223                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 224                 man->available_caching = TTM_PL_MASK_CACHING;
 225                 man->default_caching = TTM_PL_FLAG_CACHED;
 226                 break;
 227         default:
 228                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 229                 return -EINVAL;
 230         }
 231         return 0;
 232 }
 233
 234 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
 235                                 struct ttm_placement *placement)
 236 {
 237         static struct ttm_place placements = {
 238                 .fpfn  = 0,
 239                 .lpfn  = 0,
 240                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
 241         };
 242
 243         placement->placement = &placements;
 244         placement->busy_placement = &placements;
 245         placement->num_placement = 1;
 246         placement->num_busy_placement = 1;
 247         return;
 248 }
 249
 250 static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
 251                                     struct file *filp)
 252 {
 253         return 0;
 254 }
 255
 256 static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 257                                          struct ttm_mem_reg *mem)
 258 {
 259         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 260
 261         mem->bus.addr = NULL;
 262         mem->bus.offset = 0;
 263         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 264         mem->bus.base = 0;
 265         mem->bus.is_iomem = false;
 266         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 267                 return -EINVAL;
 268         switch (mem->mem_type) {
 269         case TTM_PL_SYSTEM:
 270         case TTM_PL_TT:
 271                 /* system memory */
 272                 return 0;
 273         default:
 274                 return -EINVAL;
 275         }
 276         return 0;
 277 }
 278
 279 static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
 280                                        struct ttm_mem_reg *mem)
 281 {
 282 }
 283
 284 /*
 285  * TTM backend functions.
 286  */
 287 struct virtio_gpu_ttm_tt {
 288         struct ttm_dma_tt               ttm;
 289         struct virtio_gpu_device        *vgdev;
 290         u64                             offset;
 291 };
 292
 293 static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
 294                                        struct ttm_mem_reg *bo_mem)
 295 {
 296         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 297
 298         gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 299         if (!ttm->num_pages)
 300                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 301                      ttm->num_pages, bo_mem, ttm);
 302
 303         /* Not implemented */
 304         return 0;
 305 }
 306
 307 static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
 308 {
 309         /* Not implemented */
 310         return 0;
 311 }
 312
 313 static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
 314 {
 315         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 316
 317         ttm_dma_tt_fini(&gtt->ttm);
 318         kfree(gtt);
 319 }
 320
 321 static struct ttm_backend_func virtio_gpu_backend_func = {
 322         .bind = &virtio_gpu_ttm_backend_bind,
 323         .unbind = &virtio_gpu_ttm_backend_unbind,
 324         .destroy = &virtio_gpu_ttm_backend_destroy,
 325 };
 326
 327 static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
 328 {
 329         if (ttm->state != tt_unpopulated)
 330                 return 0;
 331
 332         return ttm_pool_populate(ttm);
 333 }
 334
 335 static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
 336 {
 337         ttm_pool_unpopulate(ttm);
 338 }
 339
 340 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
 341                                                unsigned long size,
 342                                                uint32_t page_flags,
 343                                                struct page *dummy_read_page)
 344 {
 345         struct virtio_gpu_device *vgdev;
 346         struct virtio_gpu_ttm_tt *gtt;
 347
 348         vgdev = virtio_gpu_get_vgdev(bdev);
 349         gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
 350         if (gtt == NULL)
 351                 return NULL;
 352         gtt->ttm.ttm.func = &virtio_gpu_backend_func;
 353         gtt->vgdev = vgdev;
 354         if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
 355                             dummy_read_page)) {
 356                 kfree(gtt);
 357                 return NULL;
 358         }
 359         return &gtt->ttm.ttm;
 360 }
 361
 362 static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
 363                                  struct ttm_mem_reg *new_mem)
 364 {
 365         struct ttm_mem_reg *old_mem = &bo->mem;
 366
 367         BUG_ON(old_mem->mm_node != NULL);
 368         *old_mem = *new_mem;
 369         new_mem->mm_node = NULL;
 370 }
 371
 372 static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
 373                               bool evict, bool interruptible,
 374                               bool no_wait_gpu,
 375                               struct ttm_mem_reg *new_mem)
 376 {
 377         int ret;
 378
 379         ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
 380         if (ret)
 381                 return ret;
 382
 383         virtio_gpu_move_null(bo, new_mem);
 384         return 0;
 385 }
 386
 387 static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
 388                                       bool evict,
 389                                       struct ttm_mem_reg *new_mem)
 390 {
 391         struct virtio_gpu_object *bo;
 392         struct virtio_gpu_device *vgdev;
 393
 394         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 395         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 396
 397         if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
 398                 if (bo->hw_res_handle)
 399                         virtio_gpu_cmd_resource_inval_backing(vgdev,
 400                                                            bo->hw_res_handle);
 401
 402         } else if (new_mem->placement & TTM_PL_FLAG_TT) {
 403                 if (bo->hw_res_handle) {
 404                         virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
 405                                                  NULL);
 406                 }
 407         }
 408 }
 409
 410 static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
 411 {
 412         struct virtio_gpu_object *bo;
 413         struct virtio_gpu_device *vgdev;
 414
 415         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 416         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 417
 418         if (bo->pages)
 419                 virtio_gpu_object_free_sg_table(bo);
 420 }
 421
 422 static struct ttm_bo_driver virtio_gpu_bo_driver = {
 423         .ttm_tt_create = &virtio_gpu_ttm_tt_create,
 424         .ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
 425         .ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
 426         .invalidate_caches = &virtio_gpu_invalidate_caches,
 427         .init_mem_type = &virtio_gpu_init_mem_type,
 428         .eviction_valuable = ttm_bo_eviction_valuable,
 429         .evict_flags = &virtio_gpu_evict_flags,
 430         .move = &virtio_gpu_bo_move,
 431         .verify_access = &virtio_gpu_verify_access,
 432         .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
 433         .io_mem_free = &virtio_gpu_ttm_io_mem_free,
 434         .move_notify = &virtio_gpu_bo_move_notify,
 435         .swap_notify = &virtio_gpu_bo_swap_notify,
 436 };
 437
 438 int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 439 {
 440         int r;
 441
 442         r = virtio_gpu_ttm_global_init(vgdev);
 443         if (r)
 444                 return r;
 445         /* No others user of address space so set it to 0 */
 446         r = ttm_bo_device_init(&vgdev->mman.bdev,
 447                                vgdev->mman.bo_global_ref.ref.object,
 448                                &virtio_gpu_bo_driver,
 449                                vgdev->ddev->anon_inode->i_mapping,
 450                                DRM_FILE_PAGE_OFFSET, 0);
 451         if (r) {
 452                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 453                 goto err_dev_init;
 454         }
 455
 456         r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
 457         if (r) {
 458                 DRM_ERROR("Failed initializing GTT heap.\n");
 459                 goto err_mm_init;
 460         }
 461         return 0;
 462
 463 err_mm_init:
 464         ttm_bo_device_release(&vgdev->mman.bdev);
 465 err_dev_init:
 466         virtio_gpu_ttm_global_fini(vgdev);
 467         return r;
 468 }
 469
 470 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
 471 {
 472         ttm_bo_device_release(&vgdev->mman.bdev);
 473         virtio_gpu_ttm_global_fini(vgdev);
 474         DRM_INFO("virtio_gpu: ttm finalized\n");
 475 }