1 // SPDX-License-Identifier: GPL-2.0 OR MIT
2 /**************************************************************************
3 *
4 * Copyright 2009-2011 VMware, Inc., Palo Alto, CA., USA
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 #include "vmwgfx_drv.h"
29
vmw_bo_vm_lookup(struct ttm_device * bdev,struct drm_file * filp,unsigned long offset,unsigned long pages,struct ttm_buffer_object ** p_bo)30 static int vmw_bo_vm_lookup(struct ttm_device *bdev,
31 struct drm_file *filp,
32 unsigned long offset,
33 unsigned long pages,
34 struct ttm_buffer_object **p_bo)
35 {
36 struct vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);
37 struct drm_device *drm = &dev_priv->drm;
38 struct drm_vma_offset_node *node;
39 int ret;
40
41 *p_bo = NULL;
42
43 drm_vma_offset_lock_lookup(bdev->vma_manager);
44
45 node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
46 if (likely(node)) {
47 *p_bo = container_of(node, struct ttm_buffer_object,
48 base.vma_node);
49 *p_bo = ttm_bo_get_unless_zero(*p_bo);
50 }
51
52 drm_vma_offset_unlock_lookup(bdev->vma_manager);
53
54 if (!*p_bo) {
55 drm_err(drm, "Could not find buffer object to map\n");
56 return -EINVAL;
57 }
58
59 if (!drm_vma_node_is_allowed(node, filp)) {
60 ret = -EACCES;
61 goto out_no_access;
62 }
63
64 return 0;
65 out_no_access:
66 ttm_bo_put(*p_bo);
67 return ret;
68 }
69
vmw_mmap(struct file * filp,struct vm_area_struct * vma)70 int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
71 {
72 static const struct vm_operations_struct vmw_vm_ops = {
73 .pfn_mkwrite = vmw_bo_vm_mkwrite,
74 .page_mkwrite = vmw_bo_vm_mkwrite,
75 .fault = vmw_bo_vm_fault,
76 .open = ttm_bo_vm_open,
77 .close = ttm_bo_vm_close,
78 };
79 struct drm_file *file_priv = filp->private_data;
80 struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);
81 struct ttm_device *bdev = &dev_priv->bdev;
82 struct ttm_buffer_object *bo;
83 int ret;
84
85 if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
86 return -EINVAL;
87
88 ret = vmw_bo_vm_lookup(bdev, file_priv, vma->vm_pgoff, vma_pages(vma), &bo);
89 if (unlikely(ret != 0))
90 return ret;
91
92 ret = ttm_bo_mmap_obj(vma, bo);
93 if (unlikely(ret != 0))
94 goto out_unref;
95
96 vma->vm_ops = &vmw_vm_ops;
97
98 /* Use VM_PFNMAP rather than VM_MIXEDMAP if not a COW mapping */
99 if (!is_cow_mapping(vma->vm_flags))
100 vm_flags_mod(vma, VM_PFNMAP, VM_MIXEDMAP);
101
102 ttm_bo_put(bo); /* release extra ref taken by ttm_bo_mmap_obj() */
103
104 return 0;
105
106 out_unref:
107 ttm_bo_put(bo);
108 return ret;
109 }
110
111