drivers/gpu/drm/virtio/virtgpu_object.c

   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
  28 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
  29                                        uint32_t *resid)
  30 {
  31 #if 0
  32         int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
  33
  34         if (handle < 0)
  35                 return handle;
  36 #else
  37         static int handle;
  38
  39         /*
  40          * FIXME: dirty hack to avoid re-using IDs, virglrenderer
  41          * can't deal with that.  Needs fixing in virglrenderer, also
  42          * should figure a better way to handle that in the guest.
  43          */
  44         handle++;
  45 #endif
  46
  47         *resid = handle + 1;
  48         return 0;
  49 }
  50
  51 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  52 {
  53 #if 0
  54         ida_free(&vgdev->resource_ida, id - 1);
  55 #endif
  56 }
  57
  58 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
  59 {
  60         struct virtio_gpu_object *bo;
  61         struct virtio_gpu_device *vgdev;
  62
  63         bo = container_of(tbo, struct virtio_gpu_object, tbo);
  64         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
  65
  66         if (bo->created)
  67                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
  68         if (bo->pages)
  69                 virtio_gpu_object_free_sg_table(bo);
  70         if (bo->vmap)
  71                 virtio_gpu_object_kunmap(bo);
  72         drm_gem_object_release(&bo->gem_base);
  73         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  74         kfree(bo);
  75 }
  76
  77 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo,
  78                                           bool pinned)
  79 {
  80         u32 c = 1;
  81         u32 pflag = pinned ? TTM_PL_FLAG_NO_EVICT : 0;
  82
  83         vgbo->placement.placement = &vgbo->placement_code;
  84         vgbo->placement.busy_placement = &vgbo->placement_code;
  85         vgbo->placement_code.fpfn = 0;
  86         vgbo->placement_code.lpfn = 0;
  87         vgbo->placement_code.flags =
  88                 TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT | pflag;
  89         vgbo->placement.num_placement = c;
  90         vgbo->placement.num_busy_placement = c;
  91
  92 }
  93
  94 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
  95                              unsigned long size, bool kernel, bool pinned,
  96                              struct virtio_gpu_object **bo_ptr)
  97 {
  98         struct virtio_gpu_object *bo;
  99         enum ttm_bo_type type;
 100         size_t acc_size;
 101         int ret;
 102
 103         if (kernel)
 104                 type = ttm_bo_type_kernel;
 105         else
 106                 type = ttm_bo_type_device;
 107         *bo_ptr = NULL;
 108
 109         acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, size,
 110                                        sizeof(struct virtio_gpu_object));
 111
 112         bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
 113         if (bo == NULL)
 114                 return -ENOMEM;
 115         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 116         if (ret < 0) {
 117                 kfree(bo);
 118                 return ret;
 119         }
 120         size = roundup(size, PAGE_SIZE);
 121         ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, size);
 122         if (ret != 0) {
 123                 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 124                 kfree(bo);
 125                 return ret;
 126         }
 127         bo->dumb = false;
 128         virtio_gpu_init_ttm_placement(bo, pinned);
 129
 130         ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, size, type,
 131                           &bo->placement, 0, !kernel, acc_size,
 132                           NULL, NULL, &virtio_gpu_ttm_bo_destroy);
 133         /* ttm_bo_init failure will call the destroy */
 134         if (ret != 0)
 135                 return ret;
 136
 137         *bo_ptr = bo;
 138         return 0;
 139 }
 140
 141 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
 142 {
 143         bo->vmap = NULL;
 144         ttm_bo_kunmap(&bo->kmap);
 145 }
 146
 147 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
 148 {
 149         bool is_iomem;
 150         int r;
 151
 152         WARN_ON(bo->vmap);
 153
 154         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 155         if (r)
 156                 return r;
 157         bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 158         return 0;
 159 }
 160
 161 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 162                                    struct virtio_gpu_object *bo)
 163 {
 164         int ret;
 165         struct page **pages = bo->tbo.ttm->pages;
 166         int nr_pages = bo->tbo.num_pages;
 167         struct ttm_operation_ctx ctx = {
 168                 .interruptible = false,
 169                 .no_wait_gpu = false
 170         };
 171
 172         /* wtf swapping */
 173         if (bo->pages)
 174                 return 0;
 175
 176         if (bo->tbo.ttm->state == tt_unpopulated)
 177                 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
 178         bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 179         if (!bo->pages)
 180                 goto out;
 181
 182         ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
 183                                         nr_pages << PAGE_SHIFT, GFP_KERNEL);
 184         if (ret)
 185                 goto out;
 186         return 0;
 187 out:
 188         kfree(bo->pages);
 189         bo->pages = NULL;
 190         return -ENOMEM;
 191 }
 192
 193 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
 194 {
 195         sg_free_table(bo->pages);
 196         kfree(bo->pages);
 197         bo->pages = NULL;
 198 }
 199
 200 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
 201 {
 202         int r;
 203
 204         r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
 205         if (unlikely(r != 0))
 206                 return r;
 207         r = ttm_bo_wait(&bo->tbo, true, no_wait);
 208         ttm_bo_unreserve(&bo->tbo);
 209         return r;
 210 }
 211