2 * Copyright(c) 2016 Intel Corporation.
4 * This file is provided under a dual BSD/GPLv2 license. When using or
5 * redistributing this file, you may do so under either license.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
24 * - Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
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31 * contributors may be used to endorse or promote products derived
32 * from this software without specific prior written permission.
34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
47 #include <linux/list.h>
48 #include <linux/rculist.h>
49 #include <linux/mmu_notifier.h>
50 #include <linux/interval_tree_generic.h>
55 struct mmu_rb_handler
{
56 struct list_head list
;
57 struct mmu_notifier mn
;
59 spinlock_t lock
; /* protect the RB tree */
60 struct mmu_rb_ops
*ops
;
63 static LIST_HEAD(mmu_rb_handlers
);
64 static DEFINE_SPINLOCK(mmu_rb_lock
); /* protect mmu_rb_handlers list */
66 static unsigned long mmu_node_start(struct mmu_rb_node
*);
67 static unsigned long mmu_node_last(struct mmu_rb_node
*);
68 static struct mmu_rb_handler
*find_mmu_handler(struct rb_root
*);
69 static inline void mmu_notifier_page(struct mmu_notifier
*, struct mm_struct
*,
71 static inline void mmu_notifier_range_start(struct mmu_notifier
*,
73 unsigned long, unsigned long);
74 static void mmu_notifier_mem_invalidate(struct mmu_notifier
*,
76 unsigned long, unsigned long);
77 static struct mmu_rb_node
*__mmu_rb_search(struct mmu_rb_handler
*,
78 unsigned long, unsigned long);
80 static struct mmu_notifier_ops mn_opts
= {
81 .invalidate_page
= mmu_notifier_page
,
82 .invalidate_range_start
= mmu_notifier_range_start
,
85 INTERVAL_TREE_DEFINE(struct mmu_rb_node
, node
, unsigned long, __last
,
86 mmu_node_start
, mmu_node_last
, static, __mmu_int_rb
);
88 static unsigned long mmu_node_start(struct mmu_rb_node
*node
)
90 return node
->addr
& PAGE_MASK
;
93 static unsigned long mmu_node_last(struct mmu_rb_node
*node
)
95 return PAGE_ALIGN(node
->addr
+ node
->len
) - 1;
98 int hfi1_mmu_rb_register(struct rb_root
*root
, struct mmu_rb_ops
*ops
)
100 struct mmu_rb_handler
*handlr
;
102 if (!ops
->invalidate
)
105 handlr
= kmalloc(sizeof(*handlr
), GFP_KERNEL
);
111 INIT_HLIST_NODE(&handlr
->mn
.hlist
);
112 spin_lock_init(&handlr
->lock
);
113 handlr
->mn
.ops
= &mn_opts
;
114 spin_lock(&mmu_rb_lock
);
115 list_add_tail_rcu(&handlr
->list
, &mmu_rb_handlers
);
116 spin_unlock(&mmu_rb_lock
);
118 return mmu_notifier_register(&handlr
->mn
, current
->mm
);
121 void hfi1_mmu_rb_unregister(struct rb_root
*root
)
123 struct mmu_rb_handler
*handler
= find_mmu_handler(root
);
129 /* Unregister first so we don't get any more notifications. */
131 mmu_notifier_unregister(&handler
->mn
, current
->mm
);
133 spin_lock(&mmu_rb_lock
);
134 list_del_rcu(&handler
->list
);
135 spin_unlock(&mmu_rb_lock
);
138 spin_lock_irqsave(&handler
->lock
, flags
);
139 if (!RB_EMPTY_ROOT(root
)) {
140 struct rb_node
*node
;
141 struct mmu_rb_node
*rbnode
;
143 while ((node
= rb_first(root
))) {
144 rbnode
= rb_entry(node
, struct mmu_rb_node
, node
);
145 rb_erase(node
, root
);
146 if (handler
->ops
->remove
)
147 handler
->ops
->remove(root
, rbnode
, NULL
);
150 spin_unlock_irqrestore(&handler
->lock
, flags
);
155 int hfi1_mmu_rb_insert(struct rb_root
*root
, struct mmu_rb_node
*mnode
)
157 struct mmu_rb_handler
*handler
= find_mmu_handler(root
);
158 struct mmu_rb_node
*node
;
165 spin_lock_irqsave(&handler
->lock
, flags
);
166 hfi1_cdbg(MMU
, "Inserting node addr 0x%llx, len %u", mnode
->addr
,
168 node
= __mmu_rb_search(handler
, mnode
->addr
, mnode
->len
);
173 __mmu_int_rb_insert(mnode
, root
);
175 if (handler
->ops
->insert
) {
176 ret
= handler
->ops
->insert(root
, mnode
);
178 __mmu_int_rb_remove(mnode
, root
);
181 spin_unlock_irqrestore(&handler
->lock
, flags
);
185 /* Caller must hold handler lock */
186 static struct mmu_rb_node
*__mmu_rb_search(struct mmu_rb_handler
*handler
,
190 struct mmu_rb_node
*node
= NULL
;
192 hfi1_cdbg(MMU
, "Searching for addr 0x%llx, len %u", addr
, len
);
193 if (!handler
->ops
->filter
) {
194 node
= __mmu_int_rb_iter_first(handler
->root
, addr
,
197 for (node
= __mmu_int_rb_iter_first(handler
->root
, addr
,
200 node
= __mmu_int_rb_iter_next(node
, addr
,
202 if (handler
->ops
->filter(node
, addr
, len
))
209 /* Caller must *not* hold handler lock. */
210 static void __mmu_rb_remove(struct mmu_rb_handler
*handler
,
211 struct mmu_rb_node
*node
, struct mm_struct
*mm
)
215 /* Validity of handler and node pointers has been checked by caller. */
216 hfi1_cdbg(MMU
, "Removing node addr 0x%llx, len %u", node
->addr
,
218 spin_lock_irqsave(&handler
->lock
, flags
);
219 __mmu_int_rb_remove(node
, handler
->root
);
220 spin_unlock_irqrestore(&handler
->lock
, flags
);
222 if (handler
->ops
->remove
)
223 handler
->ops
->remove(handler
->root
, node
, mm
);
226 struct mmu_rb_node
*hfi1_mmu_rb_search(struct rb_root
*root
, unsigned long addr
,
229 struct mmu_rb_handler
*handler
= find_mmu_handler(root
);
230 struct mmu_rb_node
*node
;
234 return ERR_PTR(-EINVAL
);
236 spin_lock_irqsave(&handler
->lock
, flags
);
237 node
= __mmu_rb_search(handler
, addr
, len
);
238 spin_unlock_irqrestore(&handler
->lock
, flags
);
243 struct mmu_rb_node
*hfi1_mmu_rb_extract(struct rb_root
*root
,
244 unsigned long addr
, unsigned long len
)
246 struct mmu_rb_handler
*handler
= find_mmu_handler(root
);
247 struct mmu_rb_node
*node
;
251 return ERR_PTR(-EINVAL
);
253 spin_lock_irqsave(&handler
->lock
, flags
);
254 node
= __mmu_rb_search(handler
, addr
, len
);
256 __mmu_int_rb_remove(node
, handler
->root
);
257 spin_unlock_irqrestore(&handler
->lock
, flags
);
262 void hfi1_mmu_rb_remove(struct rb_root
*root
, struct mmu_rb_node
*node
)
264 struct mmu_rb_handler
*handler
= find_mmu_handler(root
);
266 if (!handler
|| !node
)
269 __mmu_rb_remove(handler
, node
, NULL
);
272 static struct mmu_rb_handler
*find_mmu_handler(struct rb_root
*root
)
274 struct mmu_rb_handler
*handler
;
277 list_for_each_entry_rcu(handler
, &mmu_rb_handlers
, list
) {
278 if (handler
->root
== root
)
287 static inline void mmu_notifier_page(struct mmu_notifier
*mn
,
288 struct mm_struct
*mm
, unsigned long addr
)
290 mmu_notifier_mem_invalidate(mn
, mm
, addr
, addr
+ PAGE_SIZE
);
293 static inline void mmu_notifier_range_start(struct mmu_notifier
*mn
,
294 struct mm_struct
*mm
,
298 mmu_notifier_mem_invalidate(mn
, mm
, start
, end
);
301 static void mmu_notifier_mem_invalidate(struct mmu_notifier
*mn
,
302 struct mm_struct
*mm
,
303 unsigned long start
, unsigned long end
)
305 struct mmu_rb_handler
*handler
=
306 container_of(mn
, struct mmu_rb_handler
, mn
);
307 struct rb_root
*root
= handler
->root
;
308 struct mmu_rb_node
*node
, *ptr
= NULL
;
311 spin_lock_irqsave(&handler
->lock
, flags
);
312 for (node
= __mmu_int_rb_iter_first(root
, start
, end
- 1);
314 /* Guard against node removal. */
315 ptr
= __mmu_int_rb_iter_next(node
, start
, end
- 1);
316 hfi1_cdbg(MMU
, "Invalidating node addr 0x%llx, len %u",
317 node
->addr
, node
->len
);
318 if (handler
->ops
->invalidate(root
, node
)) {
319 __mmu_int_rb_remove(node
, root
);
320 if (handler
->ops
->remove
)
321 handler
->ops
->remove(root
, node
, mm
);
324 spin_unlock_irqrestore(&handler
->lock
, flags
);
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