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 int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
  54 {
  55         struct drm_file *file_priv;
  56         struct virtio_gpu_device *vgdev;
  57         int r;
  58
  59         file_priv = filp->private_data;
  60         vgdev = file_priv->minor->dev->dev_private;
  61         if (vgdev == NULL) {
  62                 DRM_ERROR(
  63                  "filp->private_data->minor->dev->dev_private == NULL\n");
  64                 return -EINVAL;
  65         }
  66         r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
  67
  68         return r;
  69 }
  70
  71 static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
  72                                         uint32_t flags)
  73 {
  74         return 0;
  75 }
  76
  77 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
  78                                struct ttm_buffer_object *bo,
  79                                const struct ttm_place *place,
  80                                struct ttm_mem_reg *mem)
  81 {
  82         mem->mm_node = (void *)1;
  83         return 0;
  84 }
  85
  86 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
  87                                 struct ttm_mem_reg *mem)
  88 {
  89         mem->mm_node = (void *)NULL;
  90 }
  91
  92 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
  93                            unsigned long p_size)
  94 {
  95         return 0;
  96 }
  97
  98 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
  99 {
 100         return 0;
 101 }
 102
 103 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
 104                              struct drm_printer *printer)
 105 {
 106 }
 107
 108 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
 109         .init = ttm_bo_man_init,
 110         .takedown = ttm_bo_man_takedown,
 111         .get_node = ttm_bo_man_get_node,
 112         .put_node = ttm_bo_man_put_node,
 113         .debug = ttm_bo_man_debug
 114 };
 115
 116 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 117                                     struct ttm_mem_type_manager *man)
 118 {
 119         struct virtio_gpu_device *vgdev;
 120
 121         vgdev = virtio_gpu_get_vgdev(bdev);
 122
 123         switch (type) {
 124         case TTM_PL_SYSTEM:
 125                 /* System memory */
 126                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 127                 man->available_caching = TTM_PL_MASK_CACHING;
 128                 man->default_caching = TTM_PL_FLAG_CACHED;
 129                 break;
 130         case TTM_PL_TT:
 131                 man->func = &virtio_gpu_bo_manager_func;
 132                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 133                 man->available_caching = TTM_PL_MASK_CACHING;
 134                 man->default_caching = TTM_PL_FLAG_CACHED;
 135                 break;
 136         default:
 137                 DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
 138                 return -EINVAL;
 139         }
 140         return 0;
 141 }
 142
 143 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
 144                                 struct ttm_placement *placement)
 145 {
 146         static const struct ttm_place placements = {
 147                 .fpfn  = 0,
 148                 .lpfn  = 0,
 149                 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
 150         };
 151
 152         placement->placement = &placements;
 153         placement->busy_placement = &placements;
 154         placement->num_placement = 1;
 155         placement->num_busy_placement = 1;
 156 }
 157
 158 static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
 159                                     struct file *filp)
 160 {
 161         return 0;
 162 }
 163
 164 static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 165                                          struct ttm_mem_reg *mem)
 166 {
 167         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 168
 169         mem->bus.addr = NULL;
 170         mem->bus.offset = 0;
 171         mem->bus.size = mem->num_pages << PAGE_SHIFT;
 172         mem->bus.base = 0;
 173         mem->bus.is_iomem = false;
 174         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 175                 return -EINVAL;
 176         switch (mem->mem_type) {
 177         case TTM_PL_SYSTEM:
 178         case TTM_PL_TT:
 179                 /* system memory */
 180                 return 0;
 181         default:
 182                 return -EINVAL;
 183         }
 184         return 0;
 185 }
 186
 187 static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
 188                                        struct ttm_mem_reg *mem)
 189 {
 190 }
 191
 192 /*
 193  * TTM backend functions.
 194  */
 195 struct virtio_gpu_ttm_tt {
 196         struct ttm_dma_tt               ttm;
 197         struct virtio_gpu_device        *vgdev;
 198         u64                             offset;
 199 };
 200
 201 static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
 202                                        struct ttm_mem_reg *bo_mem)
 203 {
 204         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 205
 206         gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 207         if (!ttm->num_pages)
 208                 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 209                      ttm->num_pages, bo_mem, ttm);
 210
 211         /* Not implemented */
 212         return 0;
 213 }
 214
 215 static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
 216 {
 217         /* Not implemented */
 218         return 0;
 219 }
 220
 221 static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
 222 {
 223         struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
 224
 225         ttm_dma_tt_fini(&gtt->ttm);
 226         kfree(gtt);
 227 }
 228
 229 static struct ttm_backend_func virtio_gpu_backend_func = {
 230         .bind = &virtio_gpu_ttm_backend_bind,
 231         .unbind = &virtio_gpu_ttm_backend_unbind,
 232         .destroy = &virtio_gpu_ttm_backend_destroy,
 233 };
 234
 235 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
 236                                                uint32_t page_flags)
 237 {
 238         struct virtio_gpu_device *vgdev;
 239         struct virtio_gpu_ttm_tt *gtt;
 240
 241         vgdev = virtio_gpu_get_vgdev(bo->bdev);
 242         gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
 243         if (gtt == NULL)
 244                 return NULL;
 245         gtt->ttm.ttm.func = &virtio_gpu_backend_func;
 246         gtt->vgdev = vgdev;
 247         if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
 248                 kfree(gtt);
 249                 return NULL;
 250         }
 251         return &gtt->ttm.ttm;
 252 }
 253
 254 static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
 255                                  struct ttm_mem_reg *new_mem)
 256 {
 257         struct ttm_mem_reg *old_mem = &bo->mem;
 258
 259         BUG_ON(old_mem->mm_node != NULL);
 260         *old_mem = *new_mem;
 261         new_mem->mm_node = NULL;
 262 }
 263
 264 static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, bool evict,
 265                               struct ttm_operation_ctx *ctx,
 266                               struct ttm_mem_reg *new_mem)
 267 {
 268         int ret;
 269
 270         ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
 271         if (ret)
 272                 return ret;
 273
 274         virtio_gpu_move_null(bo, new_mem);
 275         return 0;
 276 }
 277
 278 static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
 279                                       bool evict,
 280                                       struct ttm_mem_reg *new_mem)
 281 {
 282         struct virtio_gpu_object *bo;
 283         struct virtio_gpu_device *vgdev;
 284
 285         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 286         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 287
 288         if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
 289                 if (bo->hw_res_handle)
 290                         virtio_gpu_object_detach(vgdev, bo);
 291
 292         } else if (new_mem->placement & TTM_PL_FLAG_TT) {
 293                 if (bo->hw_res_handle) {
 294                         virtio_gpu_object_attach(vgdev, bo, NULL);
 295                 }
 296         }
 297 }
 298
 299 static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
 300 {
 301         struct virtio_gpu_object *bo;
 302         struct virtio_gpu_device *vgdev;
 303
 304         bo = container_of(tbo, struct virtio_gpu_object, tbo);
 305         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
 306
 307         if (bo->pages)
 308                 virtio_gpu_object_free_sg_table(bo);
 309 }
 310
 311 static struct ttm_bo_driver virtio_gpu_bo_driver = {
 312         .ttm_tt_create = &virtio_gpu_ttm_tt_create,
 313         .invalidate_caches = &virtio_gpu_invalidate_caches,
 314         .init_mem_type = &virtio_gpu_init_mem_type,
 315         .eviction_valuable = ttm_bo_eviction_valuable,
 316         .evict_flags = &virtio_gpu_evict_flags,
 317         .move = &virtio_gpu_bo_move,
 318         .verify_access = &virtio_gpu_verify_access,
 319         .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
 320         .io_mem_free = &virtio_gpu_ttm_io_mem_free,
 321         .move_notify = &virtio_gpu_bo_move_notify,
 322         .swap_notify = &virtio_gpu_bo_swap_notify,
 323 };
 324
 325 int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 326 {
 327         int r;
 328
 329         /* No others user of address space so set it to 0 */
 330         r = ttm_bo_device_init(&vgdev->mman.bdev,
 331                                &virtio_gpu_bo_driver,
 332                                vgdev->ddev->anon_inode->i_mapping,
 333                                DRM_FILE_PAGE_OFFSET, 0);
 334         if (r) {
 335                 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 336                 goto err_dev_init;
 337         }
 338
 339         r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
 340         if (r) {
 341                 DRM_ERROR("Failed initializing GTT heap.\n");
 342                 goto err_mm_init;
 343         }
 344         return 0;
 345
 346 err_mm_init:
 347         ttm_bo_device_release(&vgdev->mman.bdev);
 348 err_dev_init:
 349         return r;
 350 }
 351
 352 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
 353 {
 354         ttm_bo_device_release(&vgdev->mman.bdev);
 355         DRM_INFO("virtio_gpu: ttm finalized\n");
 356 }