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                kfree(bo);
  86                return ret;
  87        }
  88        bo->dumb = false;
  89        virtio_gpu_init_ttm_placement(bo, pinned);
  90
  91        ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
  92                          &bo->placement, 0, !kernel, acc_size,
  93                          NULL, NULL, &virtio_gpu_ttm_bo_destroy);
  94        /* ttm_bo_init failure will call the destroy */
  95        if (ret != 0)
  96                return ret;
  97
  98        *bo_ptr = bo;
  99        return 0;
 100}
 101
 102int virtio_gpu_object_kmap(struct virtio_gpu_object *bo, void **ptr)
 103{
 104        bool is_iomem;
 105        int r;
 106
 107        if (bo->vmap) {
 108                if (ptr)
 109                        *ptr = bo->vmap;
 110                return 0;
 111        }
 112        r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 113        if (r)
 114                return r;
 115        bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 116        if (ptr)
 117                *ptr = bo->vmap;
 118        return 0;
 119}
 120
 121int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 122                                   struct virtio_gpu_object *bo)
 123{
 124        int ret;
 125        struct page **pages = bo->tbo.ttm->pages;
 126        int nr_pages = bo->tbo.num_pages;
 127        struct ttm_operation_ctx ctx = {
 128                .interruptible = false,
 129                .no_wait_gpu = false
 130        };
 131
 132        /* wtf swapping */
 133        if (bo->pages)
 134                return 0;
 135
 136        if (bo->tbo.ttm->state == tt_unpopulated)
 137                bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
 138        bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 139        if (!bo->pages)
 140                goto out;
 141
 142        ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
 143                                        nr_pages << PAGE_SHIFT, GFP_KERNEL);
 144        if (ret)
 145                goto out;
 146        return 0;
 147out:
 148        kfree(bo->pages);
 149        bo->pages = NULL;
 150        return -ENOMEM;
 151}
 152
 153void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
 154{
 155        sg_free_table(bo->pages);
 156        kfree(bo->pages);
 157        bo->pages = NULL;
 158}
 159
 160int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
 161{
 162        int r;
 163
 164        r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
 165        if (unlikely(r != 0))
 166                return r;
 167        r = ttm_bo_wait(&bo->tbo, true, no_wait);
 168        ttm_bo_unreserve(&bo->tbo);
 169        return r;
 170}
 171
 172