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) 2015-2019 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 #include <asm/processor.h> 49 50 static inline struct page * 51 nth_page(struct page *page, int n) 52 { 53 return page + n; 54 } 55 56 #define PAGE_ALIGN(addr) round_page(addr) 57 58 struct vm_area_struct { 59 vm_offset_t vm_start; 60 vm_offset_t vm_end; 61 vm_offset_t vm_pgoff; 62 vm_paddr_t vm_pfn; /* PFN For mmap. */ 63 vm_memattr_t vm_page_prot; 64 }; 65 66 /* 67 * Compute log2 of the power of two rounded up count of pages 68 * needed for size bytes. 69 */ 70 static inline int 71 get_order(unsigned long size) 72 { 73 int order; 74 75 size = (size - 1) >> PAGE_SHIFT; 76 order = 0; 77 while (size) { 78 order++; 79 size >>= 1; 80 } 81 return (order); 82 } 83 84 /* 85 * This only works via mmap ops. 86 */ 87 static inline int 88 io_remap_pfn_range(struct vm_area_struct *vma, 89 unsigned long addr, unsigned long pfn, unsigned long size, 90 vm_memattr_t prot) 91 { 92 vma->vm_page_prot = prot; 93 vma->vm_pfn = pfn; 94 95 return (0); 96 } 97 98 static inline unsigned long 99 vma_pages(struct vm_area_struct *vma) 100 { 101 unsigned long size; 102 103 size = vma->vm_end - vma->vm_start; 104 105 return size >> PAGE_SHIFT; 106 } 107 108 #define offset_in_page(off) ((off) & PAGE_MASK) 109 110 static inline void 111 set_page_dirty(struct page *page) 112 { 113 vm_page_dirty((struct vm_page *)page); 114 } 115 116 /* 117 * Allocate multiple contiguous pages. The DragonFly code can only do 118 * multiple allocations via the free page reserve. Linux does not appear 119 * to restrict the address space, so neither do we. 120 */ 121 static inline struct vm_page * 122 alloc_pages(int flags, u_int order) 123 { 124 size_t bytes = PAGE_SIZE << order; 125 struct vm_page *pgs; 126 127 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 128 VM_MEMATTR_DEFAULT); 129 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs); 130 return pgs; 131 } 132 133 /* 134 * Free multiple contiguous pages 135 */ 136 static inline void 137 __free_pages(struct vm_page *pgs, u_int order) 138 { 139 size_t bytes = PAGE_SIZE << order; 140 141 vm_page_free_contig(pgs, bytes); 142 } 143 144 static inline void 145 get_page(struct vm_page *page) 146 { 147 vm_page_hold(page); 148 } 149 150 extern vm_paddr_t Realmem; 151 152 static inline unsigned long get_num_physpages(void) 153 { 154 return Realmem / PAGE_SIZE; 155 } 156 157 int is_vmalloc_addr(const void *x); 158 159 static inline void 160 unmap_mapping_range(struct address_space *mapping, 161 loff_t const holebegin, loff_t const holelen, int even_cows) 162 { 163 } 164 165 #endif /* _LINUX_MM_H_ */ 166