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 <linux/dma-mapping.h>
  27 #include <linux/moduleparam.h>
  28
  29 #include "virtgpu_drv.h"
  30
  31 static int virtio_gpu_virglrenderer_workaround = 1;
  32 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
  33
  34 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
  35                                        uint32_t *resid)
  36 {
  37         if (virtio_gpu_virglrenderer_workaround) {
  38                 /*
  39                  * Hack to avoid re-using resource IDs.
  40                  *
  41                  * virglrenderer versions up to (and including) 0.7.0
  42                  * can't deal with that.  virglrenderer commit
  43                  * "f91a9dd35715 Fix unlinking resources from hash
  44                  * table." (Feb 2019) fixes the bug.
  45                  */
  46                 static atomic_t seqno = ATOMIC_INIT(0);
  47                 int handle = atomic_inc_return(&seqno);
  48                 *resid = handle + 1;
  49         } else {
  50                 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
  51                 if (handle < 0)
  52                         return handle;
  53                 *resid = handle + 1;
  54         }
  55         return 0;
  56 }
  57
  58 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  59 {
  60         if (!virtio_gpu_virglrenderer_workaround) {
  61                 ida_free(&vgdev->resource_ida, id - 1);
  62         }
  63 }
  64
  65 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
  66 {
  67         struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
  68
  69         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  70         if (virtio_gpu_is_shmem(bo)) {
  71                 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
  72
  73                 if (shmem->pages) {
  74                         if (shmem->mapped) {
  75                                 dma_unmap_sg(vgdev->vdev->dev.parent,
  76                                              shmem->pages->sgl, shmem->mapped,
  77                                              DMA_TO_DEVICE);
  78                                 shmem->mapped = 0;
  79                         }
  80
  81                         sg_free_table(shmem->pages);
  82                         shmem->pages = NULL;
  83                         drm_gem_shmem_unpin(&bo->base.base);
  84                 }
  85
  86                 drm_gem_shmem_free_object(&bo->base.base);
  87         }
  88 }
  89
  90 static void virtio_gpu_free_object(struct drm_gem_object *obj)
  91 {
  92         struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
  93         struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
  94
  95         if (bo->created) {
  96                 virtio_gpu_cmd_unref_resource(vgdev, bo);
  97                 virtio_gpu_notify(vgdev);
  98                 /* completion handler calls virtio_gpu_cleanup_object() */
  99                 return;
 100         }
 101         virtio_gpu_cleanup_object(bo);
 102 }
 103
 104 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 105         .free = virtio_gpu_free_object,
 106         .open = virtio_gpu_gem_object_open,
 107         .close = virtio_gpu_gem_object_close,
 108
 109         .print_info = drm_gem_shmem_print_info,
 110         .pin = drm_gem_shmem_pin,
 111         .unpin = drm_gem_shmem_unpin,
 112         .get_sg_table = drm_gem_shmem_get_sg_table,
 113         .vmap = drm_gem_shmem_vmap,
 114         .vunmap = drm_gem_shmem_vunmap,
 115         .mmap = drm_gem_shmem_mmap,
 116 };
 117
 118 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 119 {
 120         return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 121 }
 122
 123 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
 124                                                 size_t size)
 125 {
 126         struct virtio_gpu_object_shmem *shmem;
 127         struct drm_gem_shmem_object *dshmem;
 128
 129         shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
 130         if (!shmem)
 131                 return NULL;
 132
 133         dshmem = &shmem->base.base;
 134         dshmem->base.funcs = &virtio_gpu_shmem_funcs;
 135         dshmem->map_cached = true;
 136         return &dshmem->base;
 137 }
 138
 139 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 140                                         struct virtio_gpu_object *bo,
 141                                         struct virtio_gpu_mem_entry **ents,
 142                                         unsigned int *nents)
 143 {
 144         bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
 145         struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 146         struct scatterlist *sg;
 147         int si, ret;
 148
 149         ret = drm_gem_shmem_pin(&bo->base.base);
 150         if (ret < 0)
 151                 return -EINVAL;
 152
 153         shmem->pages = drm_gem_shmem_get_sg_table(&bo->base.base);
 154         if (!shmem->pages) {
 155                 drm_gem_shmem_unpin(&bo->base.base);
 156                 return -EINVAL;
 157         }
 158
 159         if (use_dma_api) {
 160                 shmem->mapped = dma_map_sg(vgdev->vdev->dev.parent,
 161                                            shmem->pages->sgl,
 162                                            shmem->pages->nents,
 163                                            DMA_TO_DEVICE);
 164                 *nents = shmem->mapped;
 165         } else {
 166                 *nents = shmem->pages->nents;
 167         }
 168
 169         *ents = kmalloc_array(*nents, sizeof(struct virtio_gpu_mem_entry),
 170                               GFP_KERNEL);
 171         if (!(*ents)) {
 172                 DRM_ERROR("failed to allocate ent list\n");
 173                 return -ENOMEM;
 174         }
 175
 176         for_each_sg(shmem->pages->sgl, sg, *nents, si) {
 177                 (*ents)[si].addr = cpu_to_le64(use_dma_api
 178                                                ? sg_dma_address(sg)
 179                                                : sg_phys(sg));
 180                 (*ents)[si].length = cpu_to_le32(sg->length);
 181                 (*ents)[si].padding = 0;
 182         }
 183         return 0;
 184 }
 185
 186 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 187                              struct virtio_gpu_object_params *params,
 188                              struct virtio_gpu_object **bo_ptr,
 189                              struct virtio_gpu_fence *fence)
 190 {
 191         struct virtio_gpu_object_array *objs = NULL;
 192         struct drm_gem_shmem_object *shmem_obj;
 193         struct virtio_gpu_object *bo;
 194         struct virtio_gpu_mem_entry *ents;
 195         unsigned int nents;
 196         int ret;
 197
 198         *bo_ptr = NULL;
 199
 200         params->size = roundup(params->size, PAGE_SIZE);
 201         shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
 202         if (IS_ERR(shmem_obj))
 203                 return PTR_ERR(shmem_obj);
 204         bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
 205
 206         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 207         if (ret < 0)
 208                 goto err_free_gem;
 209
 210         bo->dumb = params->dumb;
 211
 212         if (fence) {
 213                 ret = -ENOMEM;
 214                 objs = virtio_gpu_array_alloc(1);
 215                 if (!objs)
 216                         goto err_put_id;
 217                 virtio_gpu_array_add_obj(objs, &bo->base.base);
 218
 219                 ret = virtio_gpu_array_lock_resv(objs);
 220                 if (ret != 0)
 221                         goto err_put_objs;
 222         }
 223
 224         if (params->virgl) {
 225                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 226                                                   objs, fence);
 227         } else {
 228                 virtio_gpu_cmd_create_resource(vgdev, bo, params,
 229                                                objs, fence);
 230         }
 231
 232         ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
 233         if (ret != 0) {
 234                 virtio_gpu_free_object(&shmem_obj->base);
 235                 return ret;
 236         }
 237
 238         virtio_gpu_object_attach(vgdev, bo, ents, nents);
 239
 240         *bo_ptr = bo;
 241         return 0;
 242
 243 err_put_objs:
 244         virtio_gpu_array_put_free(objs);
 245 err_put_id:
 246         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 247 err_free_gem:
 248         drm_gem_shmem_free_object(&shmem_obj->base);
 249         return ret;
 250 }