1 | /* $NetBSD: drm_vma_manager.h,v 1.1 2014/07/16 20:56:25 riastradh Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2014 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by Taylor R. Campbell. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * |
19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
29 | * POSSIBILITY OF SUCH DAMAGE. |
30 | */ |
31 | |
32 | #ifndef _DRM_DRM_VMA_MANAGER_H_ |
33 | #define _DRM_DRM_VMA_MANAGER_H_ |
34 | |
35 | #include <sys/types.h> |
36 | #include <sys/param.h> |
37 | #include <sys/rbtree.h> |
38 | #include <sys/rwlock.h> |
39 | #include <sys/vmem.h> |
40 | |
41 | struct drm_vma_offset_manager { |
42 | krwlock_t vom_lock; |
43 | struct rb_tree vom_nodes; |
44 | struct vmem *vom_vmem; |
45 | }; |
46 | |
47 | struct drm_vma_offset_node { |
48 | krwlock_t von_lock; |
49 | vmem_addr_t von_startpage; |
50 | vmem_size_t von_npages; |
51 | struct rb_tree von_files; |
52 | struct rb_node von_rb_node; |
53 | }; |
54 | |
55 | static inline unsigned long |
56 | drm_vma_node_start(struct drm_vma_offset_node *node) |
57 | { |
58 | return node->von_startpage; |
59 | } |
60 | |
61 | static inline unsigned long |
62 | drm_vma_node_size(struct drm_vma_offset_node *node) |
63 | { |
64 | return node->von_npages; |
65 | } |
66 | |
67 | static inline bool |
68 | drm_vma_node_has_offset(struct drm_vma_offset_node *node) |
69 | { |
70 | return (node->von_npages != 0); |
71 | } |
72 | |
73 | static inline uint64_t |
74 | drm_vma_node_offset_addr(struct drm_vma_offset_node *node) |
75 | { |
76 | return (uint64_t)node->von_startpage << PAGE_SHIFT; |
77 | } |
78 | |
79 | struct drm_vma_offset_file { |
80 | struct file *vof_file; |
81 | struct rb_node vof_rb_node; |
82 | }; |
83 | |
84 | void drm_vma_offset_manager_init(struct drm_vma_offset_manager *, |
85 | unsigned long, unsigned long); |
86 | void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *); |
87 | |
88 | /* |
89 | * This is called drm_vma_node_reset upstream. Name is changed so you |
90 | * have to find calls and match them with drm_vma_node_destroy. |
91 | */ |
92 | void drm_vma_node_init(struct drm_vma_offset_node *); |
93 | |
94 | /* This does not exist upstream. */ |
95 | void drm_vma_node_destroy(struct drm_vma_offset_node *); |
96 | |
97 | int drm_vma_offset_add(struct drm_vma_offset_manager *, |
98 | struct drm_vma_offset_node *, unsigned long); |
99 | void drm_vma_offset_remove(struct drm_vma_offset_manager *, |
100 | struct drm_vma_offset_node *); |
101 | |
102 | void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *); |
103 | void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *); |
104 | struct drm_vma_offset_node * |
105 | drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *, |
106 | unsigned long, unsigned long); |
107 | struct drm_vma_offset_node * |
108 | drm_vma_offset_exact_lookup(struct drm_vma_offset_manager *, |
109 | unsigned long, unsigned long); |
110 | |
111 | int drm_vma_node_allow(struct drm_vma_offset_node *, struct file *); |
112 | void drm_vma_node_revoke(struct drm_vma_offset_node *, struct file *); |
113 | bool drm_vma_node_is_allowed(struct drm_vma_offset_node *, struct file *); |
114 | int drm_vma_node_verify_access(struct drm_vma_offset_node *, |
115 | struct file *); |
116 | |
117 | #endif /* _DRM_DRM_VMA_MANAGER_H_ */ |
118 | |