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
30static 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;
65out_no_access:
66	ttm_bo_put(*p_bo);
67	return ret;
68}
69
70int 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
106out_unref:
107	ttm_bo_put(bo);
108	return ret;
109}
110
111