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                 drm_gem_shmem_free(&bo->base);
  71         } else if (virtio_gpu_is_vram(bo)) {
  72                 struct virtio_gpu_object_vram *vram = to_virtio_gpu_vram(bo);
  73
  74                 spin_lock(&vgdev->host_visible_lock);
  75                 if (drm_mm_node_allocated(&vram->vram_node))
  76                         drm_mm_remove_node(&vram->vram_node);
  77
  78                 spin_unlock(&vgdev->host_visible_lock);
  79
  80                 drm_gem_free_mmap_offset(&vram->base.base.base);
  81                 drm_gem_object_release(&vram->base.base.base);
  82                 kfree(vram);
  83         }
  84 }
  85
  86 static void virtio_gpu_free_object(struct drm_gem_object *obj)
  87 {
  88         struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
  89         struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
  90
  91         if (bo->created) {
  92                 virtio_gpu_cmd_unref_resource(vgdev, bo);
  93                 virtio_gpu_notify(vgdev);
  94                 /* completion handler calls virtio_gpu_cleanup_object() */
  95                 return;
  96         }
  97         virtio_gpu_cleanup_object(bo);
  98 }
  99
 100 static const struct drm_gem_object_funcs virtio_gpu_shmem_funcs = {
 101         .free = virtio_gpu_free_object,
 102         .open = virtio_gpu_gem_object_open,
 103         .close = virtio_gpu_gem_object_close,
 104         .print_info = drm_gem_shmem_object_print_info,
 105         .export = virtgpu_gem_prime_export,
 106         .pin = drm_gem_shmem_object_pin,
 107         .unpin = drm_gem_shmem_object_unpin,
 108         .get_sg_table = drm_gem_shmem_object_get_sg_table,
 109         .vmap = drm_gem_shmem_object_vmap,
 110         .vunmap = drm_gem_shmem_object_vunmap,
 111         .mmap = drm_gem_shmem_object_mmap,
 112         .vm_ops = &drm_gem_shmem_vm_ops,
 113 };
 114
 115 bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo)
 116 {
 117         return bo->base.base.funcs == &virtio_gpu_shmem_funcs;
 118 }
 119
 120 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
 121                                                 size_t size)
 122 {
 123         struct virtio_gpu_object_shmem *shmem;
 124         struct drm_gem_shmem_object *dshmem;
 125
 126         shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
 127         if (!shmem)
 128                 return ERR_PTR(-ENOMEM);
 129
 130         dshmem = &shmem->base.base;
 131         dshmem->base.funcs = &virtio_gpu_shmem_funcs;
 132         return &dshmem->base;
 133 }
 134
 135 static int virtio_gpu_object_shmem_init(struct virtio_gpu_device *vgdev,
 136                                         struct virtio_gpu_object *bo,
 137                                         struct virtio_gpu_mem_entry **ents,
 138                                         unsigned int *nents)
 139 {
 140         bool use_dma_api = !virtio_has_dma_quirk(vgdev->vdev);
 141         struct scatterlist *sg;
 142         struct sg_table *pages;
 143         int si;
 144
 145         pages = drm_gem_shmem_get_pages_sgt(&bo->base);
 146         if (IS_ERR(pages))
 147                 return PTR_ERR(pages);
 148
 149         if (use_dma_api)
 150                 *nents = pages->nents;
 151         else
 152                 *nents = pages->orig_nents;
 153
 154         *ents = kvmalloc_array(*nents,
 155                                sizeof(struct virtio_gpu_mem_entry),
 156                                GFP_KERNEL);
 157         if (!(*ents)) {
 158                 DRM_ERROR("failed to allocate ent list\n");
 159                 return -ENOMEM;
 160         }
 161
 162         if (use_dma_api) {
 163                 for_each_sgtable_dma_sg(pages, sg, si) {
 164                         (*ents)[si].addr = cpu_to_le64(sg_dma_address(sg));
 165                         (*ents)[si].length = cpu_to_le32(sg_dma_len(sg));
 166                         (*ents)[si].padding = 0;
 167                 }
 168         } else {
 169                 for_each_sgtable_sg(pages, sg, si) {
 170                         (*ents)[si].addr = cpu_to_le64(sg_phys(sg));
 171                         (*ents)[si].length = cpu_to_le32(sg->length);
 172                         (*ents)[si].padding = 0;
 173                 }
 174         }
 175
 176         return 0;
 177 }
 178
 179 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 180                              struct virtio_gpu_object_params *params,
 181                              struct virtio_gpu_object **bo_ptr,
 182                              struct virtio_gpu_fence *fence)
 183 {
 184         struct virtio_gpu_object_array *objs = NULL;
 185         struct drm_gem_shmem_object *shmem_obj;
 186         struct virtio_gpu_object *bo;
 187         struct virtio_gpu_mem_entry *ents = NULL;
 188         unsigned int nents;
 189         int ret;
 190
 191         *bo_ptr = NULL;
 192
 193         params->size = roundup(params->size, PAGE_SIZE);
 194         shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
 195         if (IS_ERR(shmem_obj))
 196                 return PTR_ERR(shmem_obj);
 197         bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
 198
 199         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 200         if (ret < 0)
 201                 goto err_free_gem;
 202
 203         bo->dumb = params->dumb;
 204
 205         ret = virtio_gpu_object_shmem_init(vgdev, bo, &ents, &nents);
 206         if (ret != 0)
 207                 goto err_put_id;
 208
 209         if (fence) {
 210                 ret = -ENOMEM;
 211                 objs = virtio_gpu_array_alloc(1);
 212                 if (!objs)
 213                         goto err_free_entry;
 214                 virtio_gpu_array_add_obj(objs, &bo->base.base);
 215
 216                 ret = virtio_gpu_array_lock_resv(objs);
 217                 if (ret != 0)
 218                         goto err_put_objs;
 219         }
 220
 221         if (params->blob) {
 222                 if (params->blob_mem == VIRTGPU_BLOB_MEM_GUEST)
 223                         bo->guest_blob = true;
 224
 225                 virtio_gpu_cmd_resource_create_blob(vgdev, bo, params,
 226                                                     ents, nents);
 227         } else if (params->virgl) {
 228                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 229                                                   objs, fence);
 230                 virtio_gpu_object_attach(vgdev, bo, ents, nents);
 231         } else {
 232                 virtio_gpu_cmd_create_resource(vgdev, bo, params,
 233                                                objs, fence);
 234                 virtio_gpu_object_attach(vgdev, bo, ents, nents);
 235         }
 236
 237         *bo_ptr = bo;
 238         return 0;
 239
 240 err_put_objs:
 241         virtio_gpu_array_put_free(objs);
 242 err_free_entry:
 243         kvfree(ents);
 244 err_put_id:
 245         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 246 err_free_gem:
 247         drm_gem_shmem_free(shmem_obj);
 248         return ret;
 249 }