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) 2015-2017 François Tigeot 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 #include <linux/gfp.h> 36 #include <linux/bug.h> 37 #include <linux/kernel.h> 38 39 #include <asm/page.h> 40 #include <asm/pgtable.h> 41 42 static inline struct vm_page * 43 nth_page(struct vm_page *page, int n) 44 { 45 return page + n; 46 } 47 48 #define PAGE_ALIGN(addr) round_page(addr) 49 50 struct vm_area_struct { 51 vm_offset_t vm_start; 52 vm_offset_t vm_end; 53 vm_offset_t vm_pgoff; 54 vm_paddr_t vm_pfn; /* PFN For mmap. */ 55 vm_memattr_t vm_page_prot; 56 }; 57 58 /* 59 * Compute log2 of the power of two rounded up count of pages 60 * needed for size bytes. 61 */ 62 static inline int 63 get_order(unsigned long size) 64 { 65 int order; 66 67 size = (size - 1) >> PAGE_SHIFT; 68 order = 0; 69 while (size) { 70 order++; 71 size >>= 1; 72 } 73 return (order); 74 } 75 76 /* 77 * This only works via mmap ops. 78 */ 79 static inline int 80 io_remap_pfn_range(struct vm_area_struct *vma, 81 unsigned long addr, unsigned long pfn, unsigned long size, 82 vm_memattr_t prot) 83 { 84 vma->vm_page_prot = prot; 85 vma->vm_pfn = pfn; 86 87 return (0); 88 } 89 90 static inline unsigned long 91 vma_pages(struct vm_area_struct *vma) 92 { 93 unsigned long size; 94 95 size = vma->vm_end - vma->vm_start; 96 97 return size >> PAGE_SHIFT; 98 } 99 100 #define offset_in_page(off) ((off) & PAGE_MASK) 101 102 static inline void 103 set_page_dirty(struct vm_page *page) 104 { 105 vm_page_dirty(page); 106 } 107 108 /* 109 * Allocate multiple contiguous pages. The DragonFly code can only do 110 * multiple allocations via the free page reserve. Linux does not appear 111 * to restrict the address space, so neither do we. 112 */ 113 static inline struct vm_page * 114 alloc_pages(int flags, u_int order) 115 { 116 size_t bytes = PAGE_SIZE << order; 117 struct vm_page *pgs; 118 119 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 120 VM_MEMATTR_DEFAULT); 121 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs); 122 return pgs; 123 } 124 125 /* 126 * Free multiple contiguous pages 127 */ 128 static inline void 129 __free_pages(struct vm_page *pgs, u_int order) 130 { 131 size_t bytes = PAGE_SIZE << order; 132 133 vm_page_free_contig(pgs, bytes); 134 } 135 136 static inline void 137 get_page(struct vm_page *page) 138 { 139 vm_page_hold(page); 140 } 141 142 extern vm_paddr_t Realmem; 143 144 static inline unsigned long get_num_physpages(void) 145 { 146 return Realmem / PAGE_SIZE; 147 } 148 149 int is_vmalloc_addr(const void *x); 150 151 #endif /* _LINUX_MM_H_ */ 152