1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com> 7 * Copyright (c) 2015-2018 François Tigeot <ftigeot@wolfpond.org> 8 * All rights reserved. 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 unmodified, this list of conditions, and the following 15 * disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #ifndef _LINUX_MM_H_ 32 #define _LINUX_MM_H_ 33 34 #include <linux/errno.h> 35 36 #include <linux/gfp.h> 37 #include <linux/bug.h> 38 #include <linux/list.h> 39 #include <linux/rbtree.h> 40 #include <linux/atomic.h> 41 #include <linux/mm_types.h> 42 #include <linux/err.h> 43 44 #include <asm/page.h> 45 #include <asm/pgtable.h> 46 47 static inline struct vm_page * 48 nth_page(struct vm_page *page, int n) 49 { 50 return page + n; 51 } 52 53 #define PAGE_ALIGN(addr) round_page(addr) 54 55 struct vm_area_struct { 56 vm_offset_t vm_start; 57 vm_offset_t vm_end; 58 vm_offset_t vm_pgoff; 59 vm_paddr_t vm_pfn; /* PFN For mmap. */ 60 vm_memattr_t vm_page_prot; 61 }; 62 63 /* 64 * Compute log2 of the power of two rounded up count of pages 65 * needed for size bytes. 66 */ 67 static inline int 68 get_order(unsigned long size) 69 { 70 int order; 71 72 size = (size - 1) >> PAGE_SHIFT; 73 order = 0; 74 while (size) { 75 order++; 76 size >>= 1; 77 } 78 return (order); 79 } 80 81 /* 82 * This only works via mmap ops. 83 */ 84 static inline int 85 io_remap_pfn_range(struct vm_area_struct *vma, 86 unsigned long addr, unsigned long pfn, unsigned long size, 87 vm_memattr_t prot) 88 { 89 vma->vm_page_prot = prot; 90 vma->vm_pfn = pfn; 91 92 return (0); 93 } 94 95 static inline unsigned long 96 vma_pages(struct vm_area_struct *vma) 97 { 98 unsigned long size; 99 100 size = vma->vm_end - vma->vm_start; 101 102 return size >> PAGE_SHIFT; 103 } 104 105 #define offset_in_page(off) ((off) & PAGE_MASK) 106 107 static inline void 108 set_page_dirty(struct vm_page *page) 109 { 110 vm_page_dirty(page); 111 } 112 113 /* 114 * Allocate multiple contiguous pages. The DragonFly code can only do 115 * multiple allocations via the free page reserve. Linux does not appear 116 * to restrict the address space, so neither do we. 117 */ 118 static inline struct vm_page * 119 alloc_pages(int flags, u_int order) 120 { 121 size_t bytes = PAGE_SIZE << order; 122 struct vm_page *pgs; 123 124 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 125 VM_MEMATTR_DEFAULT); 126 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs); 127 return pgs; 128 } 129 130 /* 131 * Free multiple contiguous pages 132 */ 133 static inline void 134 __free_pages(struct vm_page *pgs, u_int order) 135 { 136 size_t bytes = PAGE_SIZE << order; 137 138 vm_page_free_contig(pgs, bytes); 139 } 140 141 static inline void 142 get_page(struct vm_page *page) 143 { 144 vm_page_hold(page); 145 } 146 147 extern vm_paddr_t Realmem; 148 149 static inline unsigned long get_num_physpages(void) 150 { 151 return Realmem / PAGE_SIZE; 152 } 153 154 int is_vmalloc_addr(const void *x); 155 156 #endif /* _LINUX_MM_H_ */ 157