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/mmdebug.h> 37 #include <linux/gfp.h> 38 #include <linux/bug.h> 39 #include <linux/list.h> 40 #include <linux/mmzone.h> 41 #include <linux/rbtree.h> 42 #include <linux/atomic.h> 43 #include <linux/mm_types.h> 44 #include <linux/err.h> 45 46 #include <asm/page.h> 47 #include <asm/pgtable.h> 48 49 static inline struct page * 50 nth_page(struct page *page, int n) 51 { 52 return page + n; 53 } 54 55 #define PAGE_ALIGN(addr) round_page(addr) 56 57 struct vm_area_struct { 58 vm_offset_t vm_start; 59 vm_offset_t vm_end; 60 vm_offset_t vm_pgoff; 61 vm_paddr_t vm_pfn; /* PFN For mmap. */ 62 vm_memattr_t vm_page_prot; 63 }; 64 65 /* 66 * Compute log2 of the power of two rounded up count of pages 67 * needed for size bytes. 68 */ 69 static inline int 70 get_order(unsigned long size) 71 { 72 int order; 73 74 size = (size - 1) >> PAGE_SHIFT; 75 order = 0; 76 while (size) { 77 order++; 78 size >>= 1; 79 } 80 return (order); 81 } 82 83 /* 84 * This only works via mmap ops. 85 */ 86 static inline int 87 io_remap_pfn_range(struct vm_area_struct *vma, 88 unsigned long addr, unsigned long pfn, unsigned long size, 89 vm_memattr_t prot) 90 { 91 vma->vm_page_prot = prot; 92 vma->vm_pfn = pfn; 93 94 return (0); 95 } 96 97 static inline unsigned long 98 vma_pages(struct vm_area_struct *vma) 99 { 100 unsigned long size; 101 102 size = vma->vm_end - vma->vm_start; 103 104 return size >> PAGE_SHIFT; 105 } 106 107 #define offset_in_page(off) ((off) & PAGE_MASK) 108 109 static inline void 110 set_page_dirty(struct page *page) 111 { 112 vm_page_dirty((struct vm_page *)page); 113 } 114 115 /* 116 * Allocate multiple contiguous pages. The DragonFly code can only do 117 * multiple allocations via the free page reserve. Linux does not appear 118 * to restrict the address space, so neither do we. 119 */ 120 static inline struct vm_page * 121 alloc_pages(int flags, u_int order) 122 { 123 size_t bytes = PAGE_SIZE << order; 124 struct vm_page *pgs; 125 126 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 127 VM_MEMATTR_DEFAULT); 128 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs); 129 return pgs; 130 } 131 132 /* 133 * Free multiple contiguous pages 134 */ 135 static inline void 136 __free_pages(struct vm_page *pgs, u_int order) 137 { 138 size_t bytes = PAGE_SIZE << order; 139 140 vm_page_free_contig(pgs, bytes); 141 } 142 143 static inline void 144 get_page(struct vm_page *page) 145 { 146 vm_page_hold(page); 147 } 148 149 extern vm_paddr_t Realmem; 150 151 static inline unsigned long get_num_physpages(void) 152 { 153 return Realmem / PAGE_SIZE; 154 } 155 156 int is_vmalloc_addr(const void *x); 157 158 #endif /* _LINUX_MM_H_ */ 159