LXR linux/drivers/gpu/drm/virtio/virtgpu

   1/*
   2 * Copyright (C) 2015 Red Hat, Inc.
   3 * All Rights Reserved.
   4 *
   5 * Permission is hereby granted, free of charge, to any person obtaining
   6 * a copy of this software and associated documentation files (the
   7 * "Software"), to deal in the Software without restriction, including
   8 * without limitation the rights to use, copy, modify, merge, publish,
   9 * distribute, sublicense, and/or sell copies of the Software, and to
  10 * permit persons to whom the Software is furnished to do so, subject to
  11 * the following conditions:
  12 *
  13 * The above copyright notice and this permission notice (including the
  14 * next paragraph) shall be included in all copies or substantial
  15 * portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24 */
  25
  26#include "virtgpu_drv.h"
  27
  28static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
  29{
  30        struct virtio_gpu_object *bo;
  31        struct virtio_gpu_device *vgdev;
  32
  33        bo = container_of(tbo, struct virtio_gpu_object, tbo);
  34        vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
  35
  36        if (bo->hw_res_handle)
  37                virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
  38        if (bo->pages)
  39                virtio_gpu_object_free_sg_table(bo);
  40        drm_gem_object_release(&bo->gem_base);
  41        kfree(bo);
  42}
  43
  44static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
  45                                          bool pinned)
  46{
  47        u32 c = 1;
  48        u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
  49
  50        vgbo->placement.placement = &vgbo->placement_code;
  51        vgbo->placement.busy_placement = &vgbo->placement_code;
  52        vgbo->placement_code.fpfn = 0;
  53        vgbo->placement_code.lpfn = 0;
  54        vgbo->placement_code.flags =
  55                TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
  56        vgbo->placement.num_placement = c;
  57        vgbo->placement.num_busy_placement = c;
  58
  59}
  60
  61int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
  62                             unsigned long size, bool kernel, bool pinned,
  63                             struct virtio_gpu_object **bo_ptr)
  64{
  65        struct virtio_gpu_object *bo;
  66        enum ttm_bo_type type;
  67        size_t acc_size;
  68        int ret;
  69
  70        if (kernel)
  71                type = ttm_bo_type_kernel;
  72        else
  73                type = ttm_bo_type_device;
  74        *bo_ptr = NULL;
  75
  76        acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
  77                                       sizeof(struct virtio_gpu_object));
  78
  79        bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
  80        if (bo == NULL)
  81                return -ENOMEM;
  82        size = roundup(size, PAGE_SIZE);
  83        ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
  84        if (ret != 0)
  85                return ret;
  86        bo->dumb = false;
  87        virtio_gpu_init_ttm_placement(bo, pinned);
  88
  89        ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
  90                          &bo->placement, 0, !kernel, NULL, acc_size,
  91                          NULL, NULL, &virtio_gpu_ttm_bo_destroy);
  92        /* ttm_bo_init failure will call the destroy */
  93        if (ret != 0)
  94                return ret;
  95
  96        *bo_ptr = bo;
  97        return 0;
  98}
  99
 100int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
 101{
 102        bool is_iomem;
 103        int r;
 104
 105        if (bo->vmap) {
 106                if (ptr)
 107                        *ptr = bo->vmap;
 108                return 0;
 109        }
 110        r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 111        if (r)
 112                return r;
 113        bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 114        if (ptr)
 115                *ptr = bo->vmap;
 116        return 0;
 117}
 118
 119int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 120                                   struct virtio_gpu_object *bo)
 121{
 122        int ret;
 123        struct page **pages = bo->tbo.ttm->pages;
 124        int nr_pages = bo->tbo.num_pages;
 125
 126        /* wtf swapping */
 127        if (bo->pages)
 128                return 0;
 129
 130        if (bo->tbo.ttm->state == tt_unpopulated)
 131                bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm);
 132        bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 133        if (!bo->pages)
 134                goto out;
 135
 136        ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
 137                                        nr_pages << PAGE_SHIFT, GFP_KERNEL);
 138        if (ret)
 139                goto out;
 140        return 0;
 141out:
 142        kfree(bo->pages);
 143        bo->pages = NULL;
 144        return -ENOMEM;
 145}
 146
 147void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
 148{
 149        sg_free_table(bo->pages);
 150        kfree(bo->pages);
 151        bo->pages = NULL;
 152}
 153
 154int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
 155{
 156        int r;
 157
 158        r = ttm_bo_reserve(&bo->tbo, true, no_wait, false, NULL);
 159        if (unlikely(r != 0))
 160                return r;
 161        r = ttm_bo_wait(&bo->tbo, true, true, no_wait);
 162        ttm_bo_unreserve(&bo->tbo);
 163        return r;
 164}
 165
 166