1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2013 EMC Corp. 5 * Copyright (c) 2011 Jeffrey Roberson <jeff@freebsd.org> 6 * Copyright (c) 2008 Mayur Shardul <mayur.shardul@gmail.com> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #ifndef _VM_RADIX_H_ 32 #define _VM_RADIX_H_ 33 34 #include <vm/_vm_radix.h> 35 36 #ifdef _KERNEL 37 #include <sys/pctrie.h> 38 #include <vm/vm_page.h> 39 #include <vm/vm.h> 40 41 void vm_radix_wait(void); 42 void vm_radix_zinit(void); 43 void *vm_radix_node_alloc(struct pctrie *ptree); 44 void vm_radix_node_free(struct pctrie *ptree, void *node); 45 extern smr_t vm_radix_smr; 46 47 static __inline void 48 vm_radix_init(struct vm_radix *rtree) 49 { 50 pctrie_init(&rtree->rt_trie); 51 } 52 53 static __inline bool 54 vm_radix_is_empty(struct vm_radix *rtree) 55 { 56 return (pctrie_is_empty(&rtree->rt_trie)); 57 } 58 59 PCTRIE_DEFINE_SMR(VM_RADIX, vm_page, pindex, vm_radix_node_alloc, vm_radix_node_free, 60 vm_radix_smr); 61 62 /* 63 * Inserts the key-value pair into the trie. 64 * Panics if the key already exists. 65 */ 66 static __inline int 67 vm_radix_insert(struct vm_radix *rtree, vm_page_t page) 68 { 69 return (VM_RADIX_PCTRIE_INSERT(&rtree->rt_trie, page)); 70 } 71 72 /* 73 * Returns the value stored at the index assuming there is an external lock. 74 * 75 * If the index is not present, NULL is returned. 76 */ 77 static __inline vm_page_t 78 vm_radix_lookup(struct vm_radix *rtree, vm_pindex_t index) 79 { 80 return (VM_RADIX_PCTRIE_LOOKUP(&rtree->rt_trie, index)); 81 } 82 83 /* 84 * Returns the value stored at the index without requiring an external lock. 85 * 86 * If the index is not present, NULL is returned. 87 */ 88 static __inline vm_page_t 89 vm_radix_lookup_unlocked(struct vm_radix *rtree, vm_pindex_t index) 90 { 91 return (VM_RADIX_PCTRIE_LOOKUP_UNLOCKED(&rtree->rt_trie, index)); 92 } 93 94 /* 95 * Returns the page with the least pindex that is greater than or equal to the 96 * specified pindex, or NULL if there are no such pages. 97 * 98 * Requires that access be externally synchronized by a lock. 99 */ 100 static __inline vm_page_t 101 vm_radix_lookup_ge(struct vm_radix *rtree, vm_pindex_t index) 102 { 103 return (VM_RADIX_PCTRIE_LOOKUP_GE(&rtree->rt_trie, index)); 104 } 105 106 /* 107 * Returns the page with the greatest pindex that is less than or equal to the 108 * specified pindex, or NULL if there are no such pages. 109 * 110 * Requires that access be externally synchronized by a lock. 111 */ 112 static __inline vm_page_t 113 vm_radix_lookup_le(struct vm_radix *rtree, vm_pindex_t index) 114 { 115 return (VM_RADIX_PCTRIE_LOOKUP_LE(&rtree->rt_trie, index)); 116 } 117 118 /* 119 * Remove the specified index from the trie, and return the value stored at 120 * that index. If the index is not present, return NULL. 121 */ 122 static __inline vm_page_t 123 vm_radix_remove(struct vm_radix *rtree, vm_pindex_t index) 124 { 125 return (VM_RADIX_PCTRIE_REMOVE_LOOKUP(&rtree->rt_trie, index)); 126 } 127 128 /* 129 * Remove and free all the nodes from the radix tree. 130 */ 131 static __inline void 132 vm_radix_reclaim_allnodes(struct vm_radix *rtree) 133 { 134 VM_RADIX_PCTRIE_RECLAIM(&rtree->rt_trie); 135 } 136 137 /* 138 * Replace an existing page in the trie with another one. 139 * Panics if there is not an old page in the trie at the new page's index. 140 */ 141 static __inline vm_page_t 142 vm_radix_replace(struct vm_radix *rtree, vm_page_t newpage) 143 { 144 return (VM_RADIX_PCTRIE_REPLACE(&rtree->rt_trie, newpage)); 145 } 146 147 #endif /* _KERNEL */ 148 #endif /* !_VM_RADIX_H_ */ 149