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 | |
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(mgr: bdev->vma_manager); |
44 | |
45 | node = drm_vma_offset_lookup_locked(mgr: bdev->vma_manager, start: 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(bo: *p_bo); |
50 | } |
51 | |
52 | drm_vma_offset_unlock_lookup(mgr: 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, tag: filp)) { |
60 | ret = -EACCES; |
61 | goto out_no_access; |
62 | } |
63 | |
64 | return 0; |
65 | out_no_access: |
66 | ttm_bo_put(bo: *p_bo); |
67 | return ret; |
68 | } |
69 | |
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(dev: 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, filp: file_priv, offset: vma->vm_pgoff, pages: vma_pages(vma), p_bo: &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(flags: 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 | |