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 int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
 110 {
 111         struct drm_file *file_priv;
 112         struct virtio_gpu_device *vgdev;
 113         int r;
 114
 115         file_priv = filp->private_data;
 116         vgdev = file_priv->minor->dev->dev_private;
 117         if (vgdev == NULL) {
 118                 DRM_ERROR(
 119                  "filp->private_data->minor->dev->dev_private == NULL\n");
 120                 return -EINVAL;
 121         }
 122         r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
 123
 124         return r;
 125 }
 126
 127 static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
 128                                         uint32_t flags)
 129 {
 130         return 0;
 131 }
 132
 133 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
 134                                struct ttm_buffer_object *bo,
 135                                const struct ttm_place *place,
 136                                struct ttm_mem_reg *mem)
 137 {
 138         mem->mm_node = (void *)1;
 139         return 0;
 140 }
 141
 142 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
 143                                 struct ttm_mem_reg *mem)
 144 {
 145         mem->mm_node = (void *)NULL;
 146 }
 147
 148 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
 149                            unsigned long p_size)
 150 {
 151         return 0;
 152 }
 153
 154 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
 155 {
 156         return 0;
 157 }
 158
 159 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 160                              struct drm_printer *printer)
 161 {
 162 }
 163
 164 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
 165         .init = ttm_bo_man_init,
 166         .takedown = ttm_bo_man_takedown,
 167         .get_node = ttm_bo_man_get_node,
 168         .put_node = ttm_bo_man_put_node,
 169         .debug = ttm_bo_man_debug
 170 };
 171
 172 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 173                                     struct ttm_mem_type_manager *man)
 174 {
 175         struct virtio_gpu_device *vgdev;
 176
 177         vgdev = virtio_gpu_get_vgdev(bdev);
 178
 179         switch (type) {
 180         case TTM_PL_SYSTEM:
 181                 /* System memory */
 182                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 183                 man->available_caching = TTM_PL_MASK_CACHING;
 184                 man->default_caching = TTM_PL_FLAG_CACHED;
 185                 break;
 186         case TTM_PL_TT:
 187                 man->func = &virtio_gpu_bo_manager_func;
 188                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 189                 man->available_caching = TTM_PL_MASK_CACHING;
 190                 man->default_caching = TTM_PL_FLAG_CACHED;
 191                 break;
 192         default:
 193                 DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
 194                 return -EINVAL;
 195         }
 196         return 0;
 197 }
 198
 199 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
 200                                 struct ttm_placement *placement)
 201 {
 202         static const struct ttm_place placements = {
 203                 .fpfn  = 0,
 204                 .lpfn  = 0,
 205                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
 206         };
 207
 208         placement->placement = &placements;
 209         placement->busy_placement = &placements;
 210         placement->num_placement = 1;
 211         placement->num_busy_placement = 1;
 212 }
 213
 214 static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
 215                                     struct file *filp)
 216 {
 217         return 0;
 218 }
 219
 220 static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 221                                          struct ttm_mem_reg *mem)
 222 {
 223         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 224
 225         mem->bus.addr = NULL;
 226         mem->bus.offset = 0;
 227         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 228         mem->bus.base = 0;
 229         mem->bus.is_iomem = false;
 230         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 231                 return -EINVAL;
 232         switch (mem->mem_type) {
 233         case TTM_PL_SYSTEM:
 234         case TTM_PL_TT:
 235                 /* system memory */
 236                 return 0;
 237         default:
 238                 return -EINVAL;
 239         }
 240         return 0;
 241 }
 242
 243 static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
 244                                        struct ttm_mem_reg *mem)
 245 {
 246 }
 247
 248 /*
 249  * TTM backend functions.
 250  */
 251 struct virtio_gpu_ttm_tt {
 252         struct ttm_dma_tt               ttm;
 253         struct virtio_gpu_device        *vgdev;
 254         u64                             offset;
 255 };
 256
 257 static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
 258                                        struct ttm_mem_reg *bo_mem)
 259 {
 260         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 261
 262         gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 263         if (!ttm->num_pages)
 264                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 265                      ttm->num_pages, bo_mem, ttm);
 266
 267         /* Not implemented */
 268         return 0;
 269 }
 270
 271 static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
 272 {
 273         /* Not implemented */
 274         return 0;
 275 }
 276
 277 static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
 278 {
 279         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 280
 281         ttm_dma_tt_fini(&gtt->ttm);
 282         kfree(gtt);
 283 }
 284
 285 static struct ttm_backend_func virtio_gpu_backend_func = {
 286         .bind = &virtio_gpu_ttm_backend_bind,
 287         .unbind = &virtio_gpu_ttm_backend_unbind,
 288         .destroy = &virtio_gpu_ttm_backend_destroy,
 289 };
 290
 291 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
 292                                                uint32_t page_flags)
 293 {
 294         struct virtio_gpu_device *vgdev;
 295         struct virtio_gpu_ttm_tt *gtt;
 296
 297         vgdev = virtio_gpu_get_vgdev(bo->bdev);
 298         gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
 299         if (gtt == NULL)
 300                 return NULL;
 301         gtt->ttm.ttm.func = &virtio_gpu_backend_func;
 302         gtt->vgdev = vgdev;
 303         if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 304                 kfree(gtt);
 305                 return NULL;
 306         }
 307         return &gtt->ttm.ttm;
 308 }
 309
 310 static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
 311                                  struct ttm_mem_reg *new_mem)
 312 {
 313         struct ttm_mem_reg *old_mem = &bo->mem;
 314
 315         BUG_ON(old_mem->mm_node != NULL);
 316         *old_mem = *new_mem;
 317         new_mem->mm_node = NULL;
 318 }
 319
 320 static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 321                               struct ttm_operation_ctx *ctx,
 322                               struct ttm_mem_reg *new_mem)
 323 {
 324         int ret;
 325
 326         ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
 327         if (ret)
 328                 return ret;
 329
 330         virtio_gpu_move_null(bo, new_mem);
 331         return 0;
 332 }
 333
 334 static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
 335                                       bool evict,
 336                                       struct ttm_mem_reg *new_mem)
 337 {
 338         struct virtio_gpu_object *bo;
 339         struct virtio_gpu_device *vgdev;
 340
 341         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 342         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 343
 344         if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
 345                 if (bo->hw_res_handle)
 346                         virtio_gpu_object_detach(vgdev, bo);
 347
 348         } else if (new_mem->placement & TTM_PL_FLAG_TT) {
 349                 if (bo->hw_res_handle) {
 350                         virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
 351                                                  NULL);
 352                 }
 353         }
 354 }
 355
 356 static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
 357 {
 358         struct virtio_gpu_object *bo;
 359         struct virtio_gpu_device *vgdev;
 360
 361         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 362         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 363
 364         if (bo->pages)
 365                 virtio_gpu_object_free_sg_table(bo);
 366 }
 367
 368 static struct ttm_bo_driver virtio_gpu_bo_driver = {
 369         .ttm_tt_create = &virtio_gpu_ttm_tt_create,
 370         .invalidate_caches = &virtio_gpu_invalidate_caches,
 371         .init_mem_type = &virtio_gpu_init_mem_type,
 372         .eviction_valuable = ttm_bo_eviction_valuable,
 373         .evict_flags = &virtio_gpu_evict_flags,
 374         .move = &virtio_gpu_bo_move,
 375         .verify_access = &virtio_gpu_verify_access,
 376         .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
 377         .io_mem_free = &virtio_gpu_ttm_io_mem_free,
 378         .move_notify = &virtio_gpu_bo_move_notify,
 379         .swap_notify = &virtio_gpu_bo_swap_notify,
 380 };
 381
 382 int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 383 {
 384         int r;
 385
 386         r = virtio_gpu_ttm_global_init(vgdev);
 387         if (r)
 388                 return r;
 389         /* No others user of address space so set it to 0 */
 390         r = ttm_bo_device_init(&vgdev->mman.bdev,
 391                                vgdev->mman.bo_global_ref.ref.object,
 392                                &virtio_gpu_bo_driver,
 393                                vgdev->ddev->anon_inode->i_mapping,
 394                                DRM_FILE_PAGE_OFFSET, 0);
 395         if (r) {
 396                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 397                 goto err_dev_init;
 398         }
 399
 400         r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
 401         if (r) {
 402                 DRM_ERROR("Failed initializing GTT heap.\n");
 403                 goto err_mm_init;
 404         }
 405         return 0;
 406
 407 err_mm_init:
 408         ttm_bo_device_release(&vgdev->mman.bdev);
 409 err_dev_init:
 410         virtio_gpu_ttm_global_fini(vgdev);
 411         return r;
 412 }
 413
 414 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
 415 {
 416         ttm_bo_device_release(&vgdev->mman.bdev);
 417         virtio_gpu_ttm_global_fini(vgdev);
 418         DRM_INFO("virtio_gpu: ttm finalized\n");
 419 }