drivers/gpu/drm/virtio/virtgpu

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This source file includes following definitions.
virtio_gpu_resource_id_get
virtio_gpu_resource_id_put
virtio_gpu_ttm_bo_destroy
virtio_gpu_init_ttm_placement
virtio_gpu_object_create
virtio_gpu_object_kunmap
virtio_gpu_object_kmap
virtio_gpu_object_get_sg_table
virtio_gpu_object_free_sg_table
virtio_gpu_object_wait
   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 <linux/moduleparam.h>
  27 
  28 #include <drm/ttm/ttm_execbuf_util.h>
  29 
  30 #include "virtgpu_drv.h"
  31 
  32 static int virtio_gpu_virglrenderer_workaround = 1;
  33 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
  34 
  35 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
  36                                        uint32_t *resid)
  37 {
  38         if (virtio_gpu_virglrenderer_workaround) {
  39                 /*
  40                  * Hack to avoid re-using resource IDs.
  41                  *
  42                  * virglrenderer versions up to (and including) 0.7.0
  43                  * can't deal with that.  virglrenderer commit
  44                  * "f91a9dd35715 Fix unlinking resources from hash
  45                  * table." (Feb 2019) fixes the bug.
  46                  */
  47                 static atomic_t seqno = ATOMIC_INIT(0);
  48                 int handle = atomic_inc_return(&seqno);
  49                 *resid = handle + 1;
  50         } else {
  51                 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
  52                 if (handle < 0)
  53                         return handle;
  54                 *resid = handle + 1;
  55         }
  56         return 0;
  57 }
  58 
  59 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  60 {
  61         if (!virtio_gpu_virglrenderer_workaround) {
  62                 ida_free(&vgdev->resource_ida, id - 1);
  63         }
  64 }
  65 
  66 static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
  67 {
  68         struct virtio_gpu_object *bo;
  69         struct virtio_gpu_device *vgdev;
  70 
  71         bo = container_of(tbo, struct virtio_gpu_object, tbo);
  72         vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
  73 
  74         if (bo->created)
  75                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
  76         if (bo->pages)
  77                 virtio_gpu_object_free_sg_table(bo);
  78         if (bo->vmap)
  79                 virtio_gpu_object_kunmap(bo);
  80         drm_gem_object_release(&bo->gem_base);
  81         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  82         kfree(bo);
  83 }
  84 
  85 static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo)
  86 {
  87         u32 c = 1;
  88 
  89         vgbo->placement.placement = &vgbo->placement_code;
  90         vgbo->placement.busy_placement = &vgbo->placement_code;
  91         vgbo->placement_code.fpfn = 0;
  92         vgbo->placement_code.lpfn = 0;
  93         vgbo->placement_code.flags =
  94                 TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT |
  95                 TTM_PL_FLAG_NO_EVICT;
  96         vgbo->placement.num_placement = c;
  97         vgbo->placement.num_busy_placement = c;
  98 
  99 }
 100 
 101 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 102                              struct virtio_gpu_object_params *params,
 103                              struct virtio_gpu_object **bo_ptr,
 104                              struct virtio_gpu_fence *fence)
 105 {
 106         struct virtio_gpu_object *bo;
 107         size_t acc_size;
 108         int ret;
 109 
 110         *bo_ptr = NULL;
 111 
 112         acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, params->size,
 113                                        sizeof(struct virtio_gpu_object));
 114 
 115         bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
 116         if (bo == NULL)
 117                 return -ENOMEM;
 118         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 119         if (ret < 0) {
 120                 kfree(bo);
 121                 return ret;
 122         }
 123         params->size = roundup(params->size, PAGE_SIZE);
 124         ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, params->size);
 125         if (ret != 0) {
 126                 virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 127                 kfree(bo);
 128                 return ret;
 129         }
 130         bo->dumb = params->dumb;
 131 
 132         if (params->virgl) {
 133                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params, fence);
 134         } else {
 135                 virtio_gpu_cmd_create_resource(vgdev, bo, params, fence);
 136         }
 137 
 138         virtio_gpu_init_ttm_placement(bo);
 139         ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
 140                           ttm_bo_type_device, &bo->placement, 0,
 141                           true, acc_size, NULL, NULL,
 142                           &virtio_gpu_ttm_bo_destroy);
 143         /* ttm_bo_init failure will call the destroy */
 144         if (ret != 0)
 145                 return ret;
 146 
 147         if (fence) {
 148                 struct virtio_gpu_fence_driver *drv = &vgdev->fence_drv;
 149                 struct list_head validate_list;
 150                 struct ttm_validate_buffer mainbuf;
 151                 struct ww_acquire_ctx ticket;
 152                 unsigned long irq_flags;
 153                 bool signaled;
 154 
 155                 INIT_LIST_HEAD(&validate_list);
 156                 memset(&mainbuf, 0, sizeof(struct ttm_validate_buffer));
 157 
 158                 /* use a gem reference since unref list undoes them */
 159                 drm_gem_object_get(&bo->gem_base);
 160                 mainbuf.bo = &bo->tbo;
 161                 list_add(&mainbuf.head, &validate_list);
 162 
 163                 ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
 164                 if (ret == 0) {
 165                         spin_lock_irqsave(&drv->lock, irq_flags);
 166                         signaled = virtio_fence_signaled(&fence->f);
 167                         if (!signaled)
 168                                 /* virtio create command still in flight */
 169                                 ttm_eu_fence_buffer_objects(&ticket, &validate_list,
 170                                                             &fence->f);
 171                         spin_unlock_irqrestore(&drv->lock, irq_flags);
 172                         if (signaled)
 173                                 /* virtio create command finished */
 174                                 ttm_eu_backoff_reservation(&ticket, &validate_list);
 175                 }
 176                 virtio_gpu_unref_list(&validate_list);
 177         }
 178 
 179         *bo_ptr = bo;
 180         return 0;
 181 }
 182 
 183 void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
 184 {
 185         bo->vmap = NULL;
 186         ttm_bo_kunmap(&bo->kmap);
 187 }
 188 
 189 int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
 190 {
 191         bool is_iomem;
 192         int r;
 193 
 194         WARN_ON(bo->vmap);
 195 
 196         r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
 197         if (r)
 198                 return r;
 199         bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
 200         return 0;
 201 }
 202 
 203 int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
 204                                    struct virtio_gpu_object *bo)
 205 {
 206         int ret;
 207         struct page **pages = bo->tbo.ttm->pages;
 208         int nr_pages = bo->tbo.num_pages;
 209         struct ttm_operation_ctx ctx = {
 210                 .interruptible = false,
 211                 .no_wait_gpu = false
 212         };
 213         size_t max_segment;
 214 
 215         /* wtf swapping */
 216         if (bo->pages)
 217                 return 0;
 218 
 219         if (bo->tbo.ttm->state == tt_unpopulated)
 220                 bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
 221         bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
 222         if (!bo->pages)
 223                 goto out;
 224 
 225         max_segment = virtio_max_dma_size(qdev->vdev);
 226         max_segment &= PAGE_MASK;
 227         if (max_segment > SCATTERLIST_MAX_SEGMENT)
 228                 max_segment = SCATTERLIST_MAX_SEGMENT;
 229         ret = __sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
 230                                           nr_pages << PAGE_SHIFT,
 231                                           max_segment, GFP_KERNEL);
 232         if (ret)
 233                 goto out;
 234         return 0;
 235 out:
 236         kfree(bo->pages);
 237         bo->pages = NULL;
 238         return -ENOMEM;
 239 }
 240 
 241 void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
 242 {
 243         sg_free_table(bo->pages);
 244         kfree(bo->pages);
 245         bo->pages = NULL;
 246 }
 247 
 248 int virtio_gpu_object_wait(struct virtio_gpu_object *bo, bool no_wait)
 249 {
 250         int r;
 251 
 252         r = ttm_bo_reserve(&bo->tbo, true, no_wait, NULL);
 253         if (unlikely(r != 0))
 254                 return r;
 255         r = ttm_bo_wait(&bo->tbo, true, no_wait);
 256         ttm_bo_unreserve(&bo->tbo);
 257         return r;
 258 }
 259
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/gpu/drm/virtio/virtgpu_object.c

DEFINITIONS
