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 int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev, uint32_t *resid)
  35 {
  36         if (virtio_gpu_virglrenderer_workaround) {
  37                 /*
  38                  * Hack to avoid re-using resource IDs.
  39                  *
  40                  * virglrenderer versions up to (and including) 0.7.0
  41                  * can't deal with that.  virglrenderer commit
  42                  * "f91a9dd35715 Fix unlinking resources from hash
  43                  * table." (Feb 2019) fixes the bug.
  44                  */
  45                 static atomic_t seqno = ATOMIC_INIT(0);
  46                 int handle = atomic_inc_return(&seqno);
  47                 *resid = handle + 1;
  48         } else {
  49                 int handle = ida_alloc(&vgdev->resource_ida, GFP_KERNEL);
  50                 if (handle < 0)
  51                         return handle;
  52                 *resid = handle + 1;
  53         }
  54         return 0;
  55 }
  56
  57 static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t id)
  58 {
  59         if (!virtio_gpu_virglrenderer_workaround) {
  60                 ida_free(&vgdev->resource_ida, id - 1);
  61         }
  62 }
  63
  64 void virtio_gpu_cleanup_object(struct virtio_gpu_object *bo)
  65 {
  66         struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
  67
  68         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  69         if (virtio_gpu_is_shmem(bo)) {
  70                 struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
  71
  72                 if (shmem->pages) {
  73                         if (shmem->mapped) {
  74                                 dma_unmap_sgtable(vgdev->vdev->dev.parent,
  75                                              shmem->pages, DMA_TO_DEVICE, 0);
  76                                 shmem->mapped = 0;
  77                         }
  78
  79                         sg_free_table(shmem->pages);
  80                         kfree(shmem->pages);
  81                         shmem->pages = NULL;
  82                         drm_gem_shmem_unpin(&bo->base);
  83                 }
  84
  85                 drm_gem_shmem_free(&bo->base);
  86         } else if (virtio_gpu_is_vram(bo)) {
  87                 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
  88
  89                 spin_lock(&vgdev->host_visible_lock);
  90                 if (drm_mm_node_allocated(&vram->vram_node))
  91                         drm_mm_remove_node(&vram->vram_node);
  92
  93                 spin_unlock(&vgdev->host_visible_lock);
  94
  95                 drm_gem_free_mmap_offset(&vram->base.base.base);
  96                 drm_gem_object_release(&vram->base.base.base);
  97                 kfree(vram);
  98         }
  99 }
 100
 101 static void virtio_gpu_free_object(struct drm_gem_object *obj)
 102 {
 103         struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
 104         struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
 105
 106         if (bo->created) {
 107                 virtio_gpu_cmd_unref_resource(vgdev, bo);
 108                 virtio_gpu_notify(vgdev);
 109                 /* completion handler calls virtio_gpu_cleanup_object() */
 110                 return;
 111         }
 112         virtio_gpu_cleanup_object(bo);
 113 }
 114
 115 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 116         .free = virtio_gpu_free_object,
 117         .open = virtio_gpu_gem_object_open,
 118         .close = virtio_gpu_gem_object_close,
 119         .print_info = drm_gem_shmem_object_print_info,
 120         .export = virtgpu_gem_prime_export,
 121         .pin = drm_gem_shmem_object_pin,
 122         .unpin = drm_gem_shmem_object_unpin,
 123         .get_sg_table = drm_gem_shmem_object_get_sg_table,
 124         .vmap = drm_gem_shmem_object_vmap,
 125         .vunmap = drm_gem_shmem_object_vunmap,
 126         .mmap = drm_gem_shmem_object_mmap,
 127 };
 128
 129 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 130 {
 131         return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 132 }
 133
 134 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
 135                                                 size_t size)
 136 {
 137         struct virtio_gpu_object_shmem *shmem;
 138         struct drm_gem_shmem_object *dshmem;
 139
 140         shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
 141         if (!shmem)
 142                 return ERR_PTR(-ENOMEM);
 143
 144         dshmem = &shmem->base.base;
 145         dshmem->base.funcs = &virtio_gpu_shmem_funcs;
 146         return &dshmem->base;
 147 }
 148
 149 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 150                                         struct virtio_gpu_object *bo,
 151                                         struct virtio_gpu_mem_entry **ents,
 152                                         unsigned int *nents)
 153 {
 154         bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
 155         struct virtio_gpu_object_shmem *shmem = to_virtio_gpu_shmem(bo);
 156         struct scatterlist *sg;
 157         int si, ret;
 158
 159         ret = drm_gem_shmem_pin(&bo->base);
 160         if (ret < 0)
 161                 return -EINVAL;
 162
 163         /*
 164          * virtio_gpu uses drm_gem_shmem_get_sg_table instead of
 165          * drm_gem_shmem_get_pages_sgt because virtio has it's own set of
 166          * dma-ops. This is discouraged for other drivers, but should be fine
 167          * since virtio_gpu doesn't support dma-buf import from other devices.
 168          */
 169         shmem->pages = drm_gem_shmem_get_sg_table(&bo->base);
 170         if (!shmem->pages) {
 171                 drm_gem_shmem_unpin(&bo->base);
 172                 return -EINVAL;
 173         }
 174
 175         if (use_dma_api) {
 176                 ret = dma_map_sgtable(vgdev->vdev->dev.parent,
 177                                       shmem->pages, DMA_TO_DEVICE, 0);
 178                 if (ret)
 179                         return ret;
 180                 *nents = shmem->mapped = shmem->pages->nents;
 181         } else {
 182                 *nents = shmem->pages->orig_nents;
 183         }
 184
 185         *ents = kvmalloc_array(*nents,
 186                                sizeof(struct virtio_gpu_mem_entry),
 187                                GFP_KERNEL);
 188         if (!(*ents)) {
 189                 DRM_ERROR("failed to allocate ent list\n");
 190                 return -ENOMEM;
 191         }
 192
 193         if (use_dma_api) {
 194                 for_each_sgtable_dma_sg(shmem->pages, sg, si) {
 195                         (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
 196                         (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
 197                         (*ents)[si].padding = 0;
 198                 }
 199         } else {
 200                 for_each_sgtable_sg(shmem->pages, sg, si) {
 201                         (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
 202                         (*ents)[si].length = cpu_to_le32(sg->length);
 203                         (*ents)[si].padding = 0;
 204                 }
 205         }
 206
 207         return 0;
 208 }
 209
 210 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 211                              struct virtio_gpu_object_params *params,
 212                              struct virtio_gpu_object **bo_ptr,
 213                              struct virtio_gpu_fence *fence)
 214 {
 215         struct virtio_gpu_object_array *objs = NULL;
 216         struct drm_gem_shmem_object *shmem_obj;
 217         struct virtio_gpu_object *bo;
 218         struct virtio_gpu_mem_entry *ents;
 219         unsigned int nents;
 220         int ret;
 221
 222         *bo_ptr = NULL;
 223
 224         params->size = roundup(params->size, PAGE_SIZE);
 225         shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
 226         if (IS_ERR(shmem_obj))
 227                 return PTR_ERR(shmem_obj);
 228         bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
 229
 230         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 231         if (ret < 0)
 232                 goto err_free_gem;
 233
 234         bo->dumb = params->dumb;
 235
 236         if (fence) {
 237                 ret = -ENOMEM;
 238                 objs = virtio_gpu_array_alloc(1);
 239                 if (!objs)
 240                         goto err_put_id;
 241                 virtio_gpu_array_add_obj(objs, &bo->base.base);
 242
 243                 ret = virtio_gpu_array_lock_resv(objs);
 244                 if (ret != 0)
 245                         goto err_put_objs;
 246         }
 247
 248         ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
 249         if (ret != 0) {
 250                 virtio_gpu_array_put_free(objs);
 251                 virtio_gpu_free_object(&shmem_obj->base);
 252                 return ret;
 253         }
 254
 255         if (params->blob) {
 256                 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
 257                         bo->guest_blob = true;
 258
 259                 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
 260                                                     ents, nents);
 261         } else if (params->virgl) {
 262                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 263                                                   objs, fence);
 264                 virtio_gpu_object_attach(vgdev, bo, ents, nents);
 265         } else {
 266                 virtio_gpu_cmd_create_resource(vgdev, bo, params,
 267                                                objs, fence);
 268                 virtio_gpu_object_attach(vgdev, bo, ents, nents);
 269         }
 270
 271         *bo_ptr = bo;
 272         return 0;
 273
 274 err_put_objs:
 275         virtio_gpu_array_put_free(objs);
 276 err_put_id:
 277         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 278 err_free_gem:
 279         drm_gem_shmem_free(shmem_obj);
 280         return ret;
 281 }