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/moduleparam.h>
  27
  28 #include "virtgpu_drv.h"
  29
  30 static int virtio_gpu_virglrenderer_workaround = 1;
  31 module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
  32
  33 static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
  34                                        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 int handle;
  46                 handle++;
  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 static void virtio_gpu_free_object(struct drm_gem_object *obj)
  65 {
  66         struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
  67         struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
  68
  69         if (bo->pages)
  70                 virtio_gpu_object_detach(vgdev, bo);
  71         if (bo->created)
  72                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
  73         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
  74
  75         drm_gem_shmem_free_object(obj);
  76 }
  77
  78 static const struct drm_gem_object_funcs virtio_gpu_gem_funcs = {
  79         .free = virtio_gpu_free_object,
  80         .open = virtio_gpu_gem_object_open,
  81         .close = virtio_gpu_gem_object_close,
  82
  83         .print_info = drm_gem_shmem_print_info,
  84         .pin = drm_gem_shmem_pin,
  85         .unpin = drm_gem_shmem_unpin,
  86         .get_sg_table = drm_gem_shmem_get_sg_table,
  87         .vmap = drm_gem_shmem_vmap,
  88         .vunmap = drm_gem_shmem_vunmap,
  89         .mmap = &drm_gem_shmem_mmap,
  90 };
  91
  92 struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
  93                                                 size_t size)
  94 {
  95         struct virtio_gpu_object *bo;
  96
  97         bo = kzalloc(sizeof(*bo), GFP_KERNEL);
  98         if (!bo)
  99                 return NULL;
 100
 101         bo->base.base.funcs = &virtio_gpu_gem_funcs;
 102         return &bo->base.base;
 103 }
 104
 105 int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
 106                              struct virtio_gpu_object_params *params,
 107                              struct virtio_gpu_object **bo_ptr,
 108                              struct virtio_gpu_fence *fence)
 109 {
 110         struct virtio_gpu_object_array *objs = NULL;
 111         struct drm_gem_shmem_object *shmem_obj;
 112         struct virtio_gpu_object *bo;
 113         int ret;
 114
 115         *bo_ptr = NULL;
 116
 117         params->size = roundup(params->size, PAGE_SIZE);
 118         shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
 119         if (IS_ERR(shmem_obj))
 120                 return PTR_ERR(shmem_obj);
 121         bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
 122
 123         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
 124         if (ret < 0)
 125                 goto err_free_gem;
 126
 127         bo->dumb = params->dumb;
 128
 129         if (fence) {
 130                 ret = -ENOMEM;
 131                 objs = virtio_gpu_array_alloc(1);
 132                 if (!objs)
 133                         goto err_put_id;
 134                 virtio_gpu_array_add_obj(objs, &bo->base.base);
 135
 136                 ret = virtio_gpu_array_lock_resv(objs);
 137                 if (ret != 0)
 138                         goto err_put_objs;
 139         }
 140
 141         if (params->virgl) {
 142                 virtio_gpu_cmd_resource_create_3d(vgdev, bo, params,
 143                                                   objs, fence);
 144         } else {
 145                 virtio_gpu_cmd_create_resource(vgdev, bo, params,
 146                                                objs, fence);
 147         }
 148
 149         ret = virtio_gpu_object_attach(vgdev, bo, NULL);
 150         if (ret != 0) {
 151                 virtio_gpu_free_object(&shmem_obj->base);
 152                 return ret;
 153         }
 154
 155         *bo_ptr = bo;
 156         return 0;
 157
 158 err_put_objs:
 159         virtio_gpu_array_put_free(objs);
 160 err_put_id:
 161         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 162 err_free_gem:
 163         drm_gem_shmem_free_object(&shmem_obj->base);
 164         return ret;
 165 }