1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. 6 * Copyright (c) 2015 François Tigeot 7 * Copyright (c) 2015 Matthew Dillon <dillon@backplane.com> 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 * $FreeBSD$ 32 */ 33 #ifndef _LINUX_MM_H_ 34 #define _LINUX_MM_H_ 35 36 #include <linux/spinlock.h> 37 #include <linux/gfp.h> 38 #include <linux/kernel.h> 39 #include <linux/mm_types.h> 40 41 #define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE) 42 43 struct vm_area_struct { 44 vm_offset_t vm_start; 45 vm_offset_t vm_end; 46 vm_offset_t vm_pgoff; 47 vm_paddr_t vm_pfn; /* PFN For mmap. */ 48 vm_size_t vm_len; /* length for mmap. */ 49 vm_memattr_t vm_page_prot; 50 }; 51 52 /* 53 * Compute log2 of the power of two rounded up count of pages 54 * needed for size bytes. 55 */ 56 static inline int 57 get_order(unsigned long size) 58 { 59 int order; 60 61 size = (size - 1) >> PAGE_SHIFT; 62 order = 0; 63 while (size) { 64 order++; 65 size >>= 1; 66 } 67 return (order); 68 } 69 70 static inline void * 71 lowmem_page_address(struct page *page) 72 { 73 74 return page_address(page); 75 } 76 77 /* 78 * This only works via mmap ops. 79 */ 80 static inline int 81 io_remap_pfn_range(struct vm_area_struct *vma, 82 unsigned long addr, unsigned long pfn, unsigned long size, 83 vm_memattr_t prot) 84 { 85 vma->vm_page_prot = prot; 86 vma->vm_pfn = pfn; 87 vma->vm_len = size; 88 89 return (0); 90 } 91 92 static inline unsigned long 93 vma_pages(struct vm_area_struct *vma) 94 { 95 return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT); 96 } 97 98 #define offset_in_page(off) ((off) & (PAGE_SIZE - 1)) 99 100 static inline void 101 set_page_dirty(struct vm_page *page) 102 { 103 vm_page_dirty(page); 104 } 105 106 static inline void 107 get_page(struct vm_page *page) 108 { 109 vm_page_hold(page); 110 } 111 112 #endif /* _LINUX_MM_H_ */ 113