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 <drm/ttm/ttm_bo_api.h>
  29 #include <drm/ttm/ttm_bo_driver.h>
  30 #include <drm/ttm/ttm_placement.h>
  31 #include <drm/ttm/ttm_page_alloc.h>
  32 #include <drm/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 }
 181
 182 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 183                            unsigned long p_size)
 184 {
 185         return 0;
 186 }
 187
 188 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 189 {
 190         return 0;
 191 }
 192
 193 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 194                              struct drm_printer *printer)
 195 {
 196 }
 197
 198 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
 199         .init = ttm_bo_man_init,
 200         .takedown = ttm_bo_man_takedown,
 201         .get_node = ttm_bo_man_get_node,
 202         .put_node = ttm_bo_man_put_node,
 203         .debug = ttm_bo_man_debug
 204 };
 205
 206 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 207                                     struct ttm_mem_type_manager *man)
 208 {
 209         struct virtio_gpu_device *vgdev;
 210
 211         vgdev = virtio_gpu_get_vgdev(bdev);
 212
 213         switch (type) {
 214         case TTM_PL_SYSTEM:
 215                 /* System memory */
 216                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 217                 man->available_caching = TTM_PL_MASK_CACHING;
 218                 man->default_caching = TTM_PL_FLAG_CACHED;
 219                 break;
 220         case TTM_PL_TT:
 221                 man->func = &virtio_gpu_bo_manager_func;
 222                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 223                 man->available_caching = TTM_PL_MASK_CACHING;
 224                 man->default_caching = TTM_PL_FLAG_CACHED;
 225                 break;
 226         default:
 227                 DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
 228                 return -EINVAL;
 229         }
 230         return 0;
 231 }
 232
 233 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
 234                                 struct ttm_placement *placement)
 235 {
 236         static const struct ttm_place placements = {
 237                 .fpfn  = 0,
 238                 .lpfn  = 0,
 239                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
 240         };
 241
 242         placement->placement = &placements;
 243         placement->busy_placement = &placements;
 244         placement->num_placement = 1;
 245         placement->num_busy_placement = 1;
 246 }
 247
 248 static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
 249                                     struct file *filp)
 250 {
 251         return 0;
 252 }
 253
 254 static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 255                                          struct ttm_mem_reg *mem)
 256 {
 257         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 258
 259         mem->bus.addr = NULL;
 260         mem->bus.offset = 0;
 261         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 262         mem->bus.base = 0;
 263         mem->bus.is_iomem = false;
 264         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 265                 return -EINVAL;
 266         switch (mem->mem_type) {
 267         case TTM_PL_SYSTEM:
 268         case TTM_PL_TT:
 269                 /* system memory */
 270                 return 0;
 271         default:
 272                 return -EINVAL;
 273         }
 274         return 0;
 275 }
 276
 277 static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
 278                                        struct ttm_mem_reg *mem)
 279 {
 280 }
 281
 282 /*
 283  * TTM backend functions.
 284  */
 285 struct virtio_gpu_ttm_tt {
 286         struct ttm_dma_tt               ttm;
 287         struct virtio_gpu_device        *vgdev;
 288         u64                             offset;
 289 };
 290
 291 static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
 292                                        struct ttm_mem_reg *bo_mem)
 293 {
 294         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 295
 296         gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 297         if (!ttm->num_pages)
 298                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 299                      ttm->num_pages, bo_mem, ttm);
 300
 301         /* Not implemented */
 302         return 0;
 303 }
 304
 305 static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
 306 {
 307         /* Not implemented */
 308         return 0;
 309 }
 310
 311 static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
 312 {
 313         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 314
 315         ttm_dma_tt_fini(&gtt->ttm);
 316         kfree(gtt);
 317 }
 318
 319 static struct ttm_backend_func virtio_gpu_backend_func = {
 320         .bind = &virtio_gpu_ttm_backend_bind,
 321         .unbind = &virtio_gpu_ttm_backend_unbind,
 322         .destroy = &virtio_gpu_ttm_backend_destroy,
 323 };
 324
 325 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
 326                                                uint32_t page_flags)
 327 {
 328         struct virtio_gpu_device *vgdev;
 329         struct virtio_gpu_ttm_tt *gtt;
 330
 331         vgdev = virtio_gpu_get_vgdev(bo->bdev);
 332         gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
 333         if (gtt == NULL)
 334                 return NULL;
 335         gtt->ttm.ttm.func = &virtio_gpu_backend_func;
 336         gtt->vgdev = vgdev;
 337         if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 338                 kfree(gtt);
 339                 return NULL;
 340         }
 341         return &gtt->ttm.ttm;
 342 }
 343
 344 static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
 345                                  struct ttm_mem_reg *new_mem)
 346 {
 347         struct ttm_mem_reg *old_mem = &bo->mem;
 348
 349         BUG_ON(old_mem->mm_node != NULL);
 350         *old_mem = *new_mem;
 351         new_mem->mm_node = NULL;
 352 }
 353
 354 static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 355                               struct ttm_operation_ctx *ctx,
 356                               struct ttm_mem_reg *new_mem)
 357 {
 358         int ret;
 359
 360         ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
 361         if (ret)
 362                 return ret;
 363
 364         virtio_gpu_move_null(bo, new_mem);
 365         return 0;
 366 }
 367
 368 static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
 369                                       bool evict,
 370                                       struct ttm_mem_reg *new_mem)
 371 {
 372         struct virtio_gpu_object *bo;
 373         struct virtio_gpu_device *vgdev;
 374
 375         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 376         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 377
 378         if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
 379                 if (bo->hw_res_handle)
 380                         virtio_gpu_cmd_resource_inval_backing(vgdev,
 381                                                            bo->hw_res_handle);
 382
 383         } else if (new_mem->placement & TTM_PL_FLAG_TT) {
 384                 if (bo->hw_res_handle) {
 385                         virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
 386                                                  NULL);
 387                 }
 388         }
 389 }
 390
 391 static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
 392 {
 393         struct virtio_gpu_object *bo;
 394         struct virtio_gpu_device *vgdev;
 395
 396         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 397         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 398
 399         if (bo->pages)
 400                 virtio_gpu_object_free_sg_table(bo);
 401 }
 402
 403 static struct ttm_bo_driver virtio_gpu_bo_driver = {
 404         .ttm_tt_create = &virtio_gpu_ttm_tt_create,
 405         .invalidate_caches = &virtio_gpu_invalidate_caches,
 406         .init_mem_type = &virtio_gpu_init_mem_type,
 407         .eviction_valuable = ttm_bo_eviction_valuable,
 408         .evict_flags = &virtio_gpu_evict_flags,
 409         .move = &virtio_gpu_bo_move,
 410         .verify_access = &virtio_gpu_verify_access,
 411         .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
 412         .io_mem_free = &virtio_gpu_ttm_io_mem_free,
 413         .move_notify = &virtio_gpu_bo_move_notify,
 414         .swap_notify = &virtio_gpu_bo_swap_notify,
 415 };
 416
 417 int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 418 {
 419         int r;
 420
 421         r = virtio_gpu_ttm_global_init(vgdev);
 422         if (r)
 423                 return r;
 424         /* No others user of address space so set it to 0 */
 425         r = ttm_bo_device_init(&vgdev->mman.bdev,
 426                                vgdev->mman.bo_global_ref.ref.object,
 427                                &virtio_gpu_bo_driver,
 428                                vgdev->ddev->anon_inode->i_mapping,
 429                                DRM_FILE_PAGE_OFFSET, 0);
 430         if (r) {
 431                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 432                 goto err_dev_init;
 433         }
 434
 435         r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
 436         if (r) {
 437                 DRM_ERROR("Failed initializing GTT heap.\n");
 438                 goto err_mm_init;
 439         }
 440         return 0;
 441
 442 err_mm_init:
 443         ttm_bo_device_release(&vgdev->mman.bdev);
 444 err_dev_init:
 445         virtio_gpu_ttm_global_fini(vgdev);
 446         return r;
 447 }
 448
 449 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
 450 {
 451         ttm_bo_device_release(&vgdev->mman.bdev);
 452         virtio_gpu_ttm_global_fini(vgdev);
 453         DRM_INFO("virtio_gpu: ttm finalized\n");
 454 }