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 <drm/ttm/ttm_execbuf_util.h>
  27
  28 #include "virtgpu_drv.h"
  29
  30 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
  31                                        uint32_t *resid)
  32 {
  33 #if 0
  34         int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
  35
  36         if (handle < 0)
  37                 return handle;
  38 #else
  39         static int handle;
  40
  41         /*
  42          * FIXME: dirty hack to avoid re-using IDs, virglrenderer
  43          * can't deal with that.  Needs fixing in virglrenderer, also
  44          * should figure a better way to handle that in the guest.
  45          */
  46         handle++;
  47 #endif
  48
  49         *resid = handle + 1;
  50         return 0;
  51 }
  52
  53 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  54 {
  55 #if 0
  56         ida_free(&vgdev->resource_ida, id - 1);
  57 #endif
  58 }
  59
  60 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
  61 {
  62         struct virtio_gpu_object *bo;
  63         struct virtio_gpu_device *vgdev;
  64
  65         bo = container_of(tbo, struct virtio_gpu_object, tbo);
  66         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
  67
  68         if (bo->created)
  69                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
  70         if (bo->pages)
  71                 virtio_gpu_object_free_sg_table(bo);
  72         if (bo->vmap)
  73                 virtio_gpu_object_kunmap(bo);
  74         drm_gem_object_release(&bo->gem_base);
  75         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  76         kfree(bo);
  77 }
  78
  79 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo)
  80 {
  81         u32 c = 1;
  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 |
  89                 TTM_PL_FLAG_NO_EVICT;
  90         vgbo->placement.num_placement = c;
  91         vgbo->placement.num_busy_placement = c;
  92
  93 }
  94
  95 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
  96                              struct virtio_gpu_object_params *params,
  97                              struct virtio_gpu_object **bo_ptr,
  98                              struct virtio_gpu_fence *fence)
  99 {
 100         struct virtio_gpu_object *bo;
 101         size_t acc_size;
 102         int ret;
 103
 104         *bo_ptr = NULL;
 105
 106         acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, params->size,
 107                                        sizeof(struct virtio_gpu_object));
 108
 109         bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
 110         if (bo == NULL)
 111                 return -ENOMEM;
 112         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 113         if (ret < 0) {
 114                 kfree(bo);
 115                 return ret;
 116         }
 117         params->size = roundup(params->size, PAGE_SIZE);
 118         ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, params->size);
 119         if (ret != 0) {
 120                 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 121                 kfree(bo);
 122                 return ret;
 123         }
 124         bo->dumb = params->dumb;
 125
 126         if (params->virgl) {
 127                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
 128         } else {
 129                 virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
 130         }
 131
 132         virtio_gpu_init_ttm_placement(bo);
 133         ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
 134                           ttm_bo_type_device, &bo->placement, 0,
 135                           true, acc_size, NULL, NULL,
 136                           &virtio_gpu_ttm_bo_destroy);
 137         /* ttm_bo_init failure will call the destroy */
 138         if (ret != 0)
 139                 return ret;
 140
 141         if (fence) {
 142                 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
 143                 struct list_head validate_list;
 144                 struct ttm_validate_buffer mainbuf;
 145                 struct ww_acquire_ctx ticket;
 146                 unsigned long irq_flags;
 147                 bool signaled;
 148
 149                 INIT_LIST_HEAD(&validate_list);
 150                 memset(&mainbuf, 0, sizeof(struct ttm_validate_buffer));
 151
 152                 /* use a gem reference since unref list undoes them */
 153                 drm_gem_object_get(&bo->gem_base);
 154                 mainbuf.bo = &bo->tbo;
 155                 list_add(&mainbuf.head, &validate_list);
 156
 157                 ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
 158                 if (ret == 0) {
 159                         spin_lock_irqsave(&drv->lock, irq_flags);
 160                         signaled = virtio_fence_signaled(&fence->f);
 161                         if (!signaled)
 162                                 /* virtio create command still in flight */
 163                                 ttm_eu_fence_buffer_objects(&ticket, &validate_list,
 164                                                             &fence->f);
 165                         spin_unlock_irqrestore(&drv->lock, irq_flags);
 166                         if (signaled)
 167                                 /* virtio create command finished */
 168                                 ttm_eu_backoff_reservation(&ticket, &validate_list);
 169                 }
 170                 virtio_gpu_unref_list(&validate_list);
 171         }
 172
 173         *bo_ptr = bo;
 174         return 0;
 175 }
 176
 177 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
 178 {
 179         bo->vmap = NULL;
 180         ttm_bo_kunmap(&bo->kmap);
 181 }
 182
 183 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
 184 {
 185         bool is_iomem;
 186         int r;
 187
 188         WARN_ON(bo->vmap);
 189
 190         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 191         if (r)
 192                 return r;
 193         bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 194         return 0;
 195 }
 196
 197 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 198                                    struct virtio_gpu_object *bo)
 199 {
 200         int ret;
 201         struct page **pages = bo->tbo.ttm->pages;
 202         int nr_pages = bo->tbo.num_pages;
 203         struct ttm_operation_ctx ctx = {
 204                 .interruptible = false,
 205                 .no_wait_gpu = false
 206         };
 207         size_t max_segment;
 208
 209         /* wtf swapping */
 210         if (bo->pages)
 211                 return 0;
 212
 213         if (bo->tbo.ttm->state == tt_unpopulated)
 214                 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
 215         bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 216         if (!bo->pages)
 217                 goto out;
 218
 219         max_segment = virtio_max_dma_size(qdev->vdev);
 220         max_segment &= PAGE_MASK;
 221         if (max_segment > SCATTERLIST_MAX_SEGMENT)
 222                 max_segment = SCATTERLIST_MAX_SEGMENT;
 223         ret = __sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
 224                                           nr_pages << PAGE_SHIFT,
 225                                           max_segment, GFP_KERNEL);
 226         if (ret)
 227                 goto out;
 228         return 0;
 229 out:
 230         kfree(bo->pages);
 231         bo->pages = NULL;
 232         return -ENOMEM;
 233 }
 234
 235 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
 236 {
 237         sg_free_table(bo->pages);
 238         kfree(bo->pages);
 239         bo->pages = NULL;
 240 }
 241
 242 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
 243 {
 244         int r;
 245
 246         r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
 247         if (unlikely(r != 0))
 248                 return r;
 249         r = ttm_bo_wait(&bo->tbo, true, no_wait);
 250         ttm_bo_unreserve(&bo->tbo);
 251         return r;
 252 }
 253