drivers/gpu/drm/virtio/virtgpu_gem.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 <drm/drmP.h>
  27 #include "virtgpu_drv.h"
  28
  29 void virtio_gpu_gem_free_object(struct drm_gem_object *gem_obj)
  30 {
  31         struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(gem_obj);
  32
  33         if (obj)
  34                 virtio_gpu_object_unref(&obj);
  35 }
  36
  37 struct virtio_gpu_object *virtio_gpu_alloc_object(struct drm_device *dev,
  38                                                   size_t size, bool kernel,
  39                                                   bool pinned)
  40 {
  41         struct virtio_gpu_device *vgdev = dev->dev_private;
  42         struct virtio_gpu_object *obj;
  43         int ret;
  44
  45         ret = virtio_gpu_object_create(vgdev, size, kernel, pinned, &obj);
  46         if (ret)
  47                 return ERR_PTR(ret);
  48
  49         return obj;
  50 }
  51
  52 int virtio_gpu_gem_create(struct drm_file *file,
  53                           struct drm_device *dev,
  54                           uint64_t size,
  55                           struct drm_gem_object **obj_p,
  56                           uint32_t *handle_p)
  57 {
  58         struct virtio_gpu_object *obj;
  59         int ret;
  60         u32 handle;
  61
  62         obj = virtio_gpu_alloc_object(dev, size, false, false);
  63         if (IS_ERR(obj))
  64                 return PTR_ERR(obj);
  65
  66         ret = drm_gem_handle_create(file, &obj->gem_base, &handle);
  67         if (ret) {
  68                 drm_gem_object_release(&obj->gem_base);
  69                 return ret;
  70         }
  71
  72         *obj_p = &obj->gem_base;
  73
  74         /* drop reference from allocate - handle holds it now */
  75         drm_gem_object_unreference_unlocked(&obj->gem_base);
  76
  77         *handle_p = handle;
  78         return 0;
  79 }
  80
  81 int virtio_gpu_mode_dumb_create(struct drm_file *file_priv,
  82                                 struct drm_device *dev,
  83                                 struct drm_mode_create_dumb *args)
  84 {
  85         struct virtio_gpu_device *vgdev = dev->dev_private;
  86         struct drm_gem_object *gobj;
  87         struct virtio_gpu_object *obj;
  88         int ret;
  89         uint32_t pitch;
  90         uint32_t resid;
  91
  92         pitch = args->width * ((args->bpp + 1) / 8);
  93         args->size = pitch * args->height;
  94         args->size = ALIGN(args->size, PAGE_SIZE);
  95
  96         ret = virtio_gpu_gem_create(file_priv, dev, args->size, &gobj,
  97                                     &args->handle);
  98         if (ret)
  99                 goto fail;
 100
 101         virtio_gpu_resource_id_get(vgdev, &resid);
 102         virtio_gpu_cmd_create_resource(vgdev, resid,
 103                                        2, args->width, args->height);
 104
 105         /* attach the object to the resource */
 106         obj = gem_to_virtio_gpu_obj(gobj);
 107         ret = virtio_gpu_object_attach(vgdev, obj, resid, NULL);
 108         if (ret)
 109                 goto fail;
 110
 111         obj->dumb = true;
 112         args->pitch = pitch;
 113         return ret;
 114
 115 fail:
 116         return ret;
 117 }
 118
 119 int virtio_gpu_mode_dumb_destroy(struct drm_file *file_priv,
 120                                  struct drm_device *dev,
 121                                  uint32_t handle)
 122 {
 123         return drm_gem_handle_delete(file_priv, handle);
 124 }
 125
 126 int virtio_gpu_mode_dumb_mmap(struct drm_file *file_priv,
 127                               struct drm_device *dev,
 128                               uint32_t handle, uint64_t *offset_p)
 129 {
 130         struct drm_gem_object *gobj;
 131         struct virtio_gpu_object *obj;
 132         BUG_ON(!offset_p);
 133         gobj = drm_gem_object_lookup(dev, file_priv, handle);
 134         if (gobj == NULL)
 135                 return -ENOENT;
 136         obj = gem_to_virtio_gpu_obj(gobj);
 137         *offset_p = virtio_gpu_object_mmap_offset(obj);
 138         drm_gem_object_unreference_unlocked(gobj);
 139         return 0;
 140 }