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1 | #ifndef __DRM_VMA_MANAGER_H__ |
2 | #define __DRM_VMA_MANAGER_H__ | |
3 | ||
4 | /* | |
5 | * Copyright (c) 2013 David Herrmann <dh.herrmann@gmail.com> | |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person obtaining a | |
8 | * copy of this software and associated documentation files (the "Software"), | |
9 | * to deal in the Software without restriction, including without limitation | |
10 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
11 | * and/or sell copies of the Software, and to permit persons to whom the | |
12 | * Software is furnished to do so, subject to the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
17 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
18 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
19 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
20 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
21 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
22 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
23 | * OTHER DEALINGS IN THE SOFTWARE. | |
24 | */ | |
25 | ||
26 | #include <drm/drm_mm.h> | |
51335df9 | 27 | #include <linux/mm.h> |
fe3078fa DH |
28 | #include <linux/rbtree.h> |
29 | #include <linux/spinlock.h> | |
30 | #include <linux/types.h> | |
31 | ||
bf141a88 TZ |
32 | /* We make up offsets for buffer objects so we can recognize them at |
33 | * mmap time. pgoff in mmap is an unsigned long, so we need to make sure | |
34 | * that the faked up offset will fit | |
35 | */ | |
36 | #if BITS_PER_LONG == 64 | |
37 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFFUL >> PAGE_SHIFT) + 1) | |
38 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFFUL >> PAGE_SHIFT) * 16) | |
39 | #else | |
40 | #define DRM_FILE_PAGE_OFFSET_START ((0xFFFFFFFUL >> PAGE_SHIFT) + 1) | |
41 | #define DRM_FILE_PAGE_OFFSET_SIZE ((0xFFFFFFFUL >> PAGE_SHIFT) * 16) | |
42 | #endif | |
43 | ||
d9a1f0b4 DH |
44 | struct drm_file; |
45 | ||
88d7ebe5 DH |
46 | struct drm_vma_offset_file { |
47 | struct rb_node vm_rb; | |
d9a1f0b4 | 48 | struct drm_file *vm_tag; |
88d7ebe5 DH |
49 | unsigned long vm_count; |
50 | }; | |
51 | ||
fe3078fa | 52 | struct drm_vma_offset_node { |
88d7ebe5 | 53 | rwlock_t vm_lock; |
fe3078fa | 54 | struct drm_mm_node vm_node; |
88d7ebe5 | 55 | struct rb_root vm_files; |
3e977ac6 | 56 | bool readonly:1; |
fe3078fa DH |
57 | }; |
58 | ||
59 | struct drm_vma_offset_manager { | |
60 | rwlock_t vm_lock; | |
fe3078fa DH |
61 | struct drm_mm vm_addr_space_mm; |
62 | }; | |
63 | ||
64 | void drm_vma_offset_manager_init(struct drm_vma_offset_manager *mgr, | |
65 | unsigned long page_offset, unsigned long size); | |
66 | void drm_vma_offset_manager_destroy(struct drm_vma_offset_manager *mgr); | |
67 | ||
fe3078fa DH |
68 | struct drm_vma_offset_node *drm_vma_offset_lookup_locked(struct drm_vma_offset_manager *mgr, |
69 | unsigned long start, | |
70 | unsigned long pages); | |
71 | int drm_vma_offset_add(struct drm_vma_offset_manager *mgr, | |
72 | struct drm_vma_offset_node *node, unsigned long pages); | |
73 | void drm_vma_offset_remove(struct drm_vma_offset_manager *mgr, | |
74 | struct drm_vma_offset_node *node); | |
75 | ||
d9a1f0b4 DH |
76 | int drm_vma_node_allow(struct drm_vma_offset_node *node, struct drm_file *tag); |
77 | void drm_vma_node_revoke(struct drm_vma_offset_node *node, | |
78 | struct drm_file *tag); | |
88d7ebe5 | 79 | bool drm_vma_node_is_allowed(struct drm_vma_offset_node *node, |
d9a1f0b4 | 80 | struct drm_file *tag); |
88d7ebe5 | 81 | |
fe3078fa | 82 | /** |
2225cfe4 | 83 | * drm_vma_offset_exact_lookup_locked() - Look up node by exact address |
fe3078fa DH |
84 | * @mgr: Manager object |
85 | * @start: Start address (page-based, not byte-based) | |
86 | * @pages: Size of object (page-based) | |
87 | * | |
2225cfe4 | 88 | * Same as drm_vma_offset_lookup_locked() but does not allow any offset into the node. |
fe3078fa DH |
89 | * It only returns the exact object with the given start address. |
90 | * | |
91 | * RETURNS: | |
92 | * Node at exact start address @start. | |
93 | */ | |
94 | static inline struct drm_vma_offset_node * | |
2225cfe4 DV |
95 | drm_vma_offset_exact_lookup_locked(struct drm_vma_offset_manager *mgr, |
96 | unsigned long start, | |
97 | unsigned long pages) | |
fe3078fa DH |
98 | { |
99 | struct drm_vma_offset_node *node; | |
100 | ||
2225cfe4 | 101 | node = drm_vma_offset_lookup_locked(mgr, start, pages); |
fe3078fa DH |
102 | return (node && node->vm_node.start == start) ? node : NULL; |
103 | } | |
104 | ||
105 | /** | |
106 | * drm_vma_offset_lock_lookup() - Lock lookup for extended private use | |
107 | * @mgr: Manager object | |
108 | * | |
f71a6d60 | 109 | * Lock VMA manager for extended lookups. Only locked VMA function calls |
fe3078fa DH |
110 | * are allowed while holding this lock. All other contexts are blocked from VMA |
111 | * until the lock is released via drm_vma_offset_unlock_lookup(). | |
112 | * | |
113 | * Use this if you need to take a reference to the objects returned by | |
114 | * drm_vma_offset_lookup_locked() before releasing this lock again. | |
115 | * | |
116 | * This lock must not be used for anything else than extended lookups. You must | |
117 | * not call any other VMA helpers while holding this lock. | |
118 | * | |
119 | * Note: You're in atomic-context while holding this lock! | |
fe3078fa DH |
120 | */ |
121 | static inline void drm_vma_offset_lock_lookup(struct drm_vma_offset_manager *mgr) | |
122 | { | |
123 | read_lock(&mgr->vm_lock); | |
124 | } | |
125 | ||
126 | /** | |
127 | * drm_vma_offset_unlock_lookup() - Unlock lookup for extended private use | |
128 | * @mgr: Manager object | |
129 | * | |
130 | * Release lookup-lock. See drm_vma_offset_lock_lookup() for more information. | |
131 | */ | |
132 | static inline void drm_vma_offset_unlock_lookup(struct drm_vma_offset_manager *mgr) | |
133 | { | |
134 | read_unlock(&mgr->vm_lock); | |
135 | } | |
136 | ||
137 | /** | |
138 | * drm_vma_node_reset() - Initialize or reset node object | |
139 | * @node: Node to initialize or reset | |
140 | * | |
88d7ebe5 DH |
141 | * Reset a node to its initial state. This must be called before using it with |
142 | * any VMA offset manager. | |
fe3078fa DH |
143 | * |
144 | * This must not be called on an already allocated node, or you will leak | |
145 | * memory. | |
146 | */ | |
147 | static inline void drm_vma_node_reset(struct drm_vma_offset_node *node) | |
148 | { | |
149 | memset(node, 0, sizeof(*node)); | |
88d7ebe5 DH |
150 | node->vm_files = RB_ROOT; |
151 | rwlock_init(&node->vm_lock); | |
fe3078fa DH |
152 | } |
153 | ||
154 | /** | |
155 | * drm_vma_node_start() - Return start address for page-based addressing | |
156 | * @node: Node to inspect | |
157 | * | |
158 | * Return the start address of the given node. This can be used as offset into | |
159 | * the linear VM space that is provided by the VMA offset manager. Note that | |
160 | * this can only be used for page-based addressing. If you need a proper offset | |
161 | * for user-space mappings, you must apply "<< PAGE_SHIFT" or use the | |
162 | * drm_vma_node_offset_addr() helper instead. | |
163 | * | |
164 | * RETURNS: | |
165 | * Start address of @node for page-based addressing. 0 if the node does not | |
166 | * have an offset allocated. | |
167 | */ | |
bf38b055 | 168 | static inline unsigned long drm_vma_node_start(const struct drm_vma_offset_node *node) |
fe3078fa DH |
169 | { |
170 | return node->vm_node.start; | |
171 | } | |
172 | ||
173 | /** | |
174 | * drm_vma_node_size() - Return size (page-based) | |
175 | * @node: Node to inspect | |
176 | * | |
177 | * Return the size as number of pages for the given node. This is the same size | |
178 | * that was passed to drm_vma_offset_add(). If no offset is allocated for the | |
179 | * node, this is 0. | |
180 | * | |
181 | * RETURNS: | |
182 | * Size of @node as number of pages. 0 if the node does not have an offset | |
183 | * allocated. | |
184 | */ | |
185 | static inline unsigned long drm_vma_node_size(struct drm_vma_offset_node *node) | |
186 | { | |
187 | return node->vm_node.size; | |
188 | } | |
189 | ||
fe3078fa DH |
190 | /** |
191 | * drm_vma_node_offset_addr() - Return sanitized offset for user-space mmaps | |
192 | * @node: Linked offset node | |
193 | * | |
194 | * Same as drm_vma_node_start() but returns the address as a valid offset that | |
195 | * can be used for user-space mappings during mmap(). | |
196 | * This must not be called on unlinked nodes. | |
197 | * | |
198 | * RETURNS: | |
199 | * Offset of @node for byte-based addressing. 0 if the node does not have an | |
200 | * object allocated. | |
201 | */ | |
202 | static inline __u64 drm_vma_node_offset_addr(struct drm_vma_offset_node *node) | |
203 | { | |
204 | return ((__u64)node->vm_node.start) << PAGE_SHIFT; | |
205 | } | |
206 | ||
51335df9 DH |
207 | /** |
208 | * drm_vma_node_unmap() - Unmap offset node | |
209 | * @node: Offset node | |
210 | * @file_mapping: Address space to unmap @node from | |
211 | * | |
212 | * Unmap all userspace mappings for a given offset node. The mappings must be | |
44d847b7 DH |
213 | * associated with the @file_mapping address-space. If no offset exists |
214 | * nothing is done. | |
51335df9 DH |
215 | * |
216 | * This call is unlocked. The caller must guarantee that drm_vma_offset_remove() | |
217 | * is not called on this node concurrently. | |
218 | */ | |
219 | static inline void drm_vma_node_unmap(struct drm_vma_offset_node *node, | |
220 | struct address_space *file_mapping) | |
221 | { | |
f74418a4 | 222 | if (drm_mm_node_allocated(&node->vm_node)) |
51335df9 DH |
223 | unmap_mapping_range(file_mapping, |
224 | drm_vma_node_offset_addr(node), | |
225 | drm_vma_node_size(node) << PAGE_SHIFT, 1); | |
226 | } | |
227 | ||
88d7ebe5 DH |
228 | /** |
229 | * drm_vma_node_verify_access() - Access verification helper for TTM | |
230 | * @node: Offset node | |
d9a1f0b4 | 231 | * @tag: Tag of file to check |
88d7ebe5 | 232 | * |
d9a1f0b4 | 233 | * This checks whether @tag is granted access to @node. It is the same as |
88d7ebe5 DH |
234 | * drm_vma_node_is_allowed() but suitable as drop-in helper for TTM |
235 | * verify_access() callbacks. | |
236 | * | |
237 | * RETURNS: | |
238 | * 0 if access is granted, -EACCES otherwise. | |
239 | */ | |
240 | static inline int drm_vma_node_verify_access(struct drm_vma_offset_node *node, | |
d9a1f0b4 | 241 | struct drm_file *tag) |
88d7ebe5 | 242 | { |
d9a1f0b4 | 243 | return drm_vma_node_is_allowed(node, tag) ? 0 : -EACCES; |
88d7ebe5 DH |
244 | } |
245 | ||
fe3078fa | 246 | #endif /* __DRM_VMA_MANAGER_H__ */ |