LXR linux/drivers/gpu/drm/virtio/virtgpu

   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
  30static int virtio_gpu_virglrenderer_workaround = 1;
  31module_param_named(virglhack, virtio_gpu_virglrenderer_workaround, int, 0400);
  32
  33static 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
  57static 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
  64static 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
  78static 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
  92struct 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
 105int 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
 158err_put_objs:
 159        virtio_gpu_array_put_free(objs);
 160err_put_id:
 161        virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
 162err_free_gem:
 163        drm_gem_shmem_free_object(&shmem_obj->base);
 164        return ret;
 165}
 166