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 40 #define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE) 41 42 struct vm_area_struct { 43 vm_offset_t vm_start; 44 vm_offset_t vm_end; 45 vm_offset_t vm_pgoff; 46 vm_paddr_t vm_pfn; /* PFN For mmap. */ 47 vm_size_t vm_len; /* length for mmap. */ 48 vm_memattr_t vm_page_prot; 49 }; 50 51 /* 52 * Compute log2 of the power of two rounded up count of pages 53 * needed for size bytes. 54 */ 55 static inline int 56 get_order(unsigned long size) 57 { 58 int order; 59 60 size = (size - 1) >> PAGE_SHIFT; 61 order = 0; 62 while (size) { 63 order++; 64 size >>= 1; 65 } 66 return (order); 67 } 68 69 static inline void * 70 lowmem_page_address(struct page *page) 71 { 72 73 return page_address(page); 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 vma->vm_len = size; 87 88 return (0); 89 } 90 91 static inline unsigned long 92 vma_pages(struct vm_area_struct *vma) 93 { 94 return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT); 95 } 96 97 #define offset_in_page(off) ((off) & (PAGE_SIZE - 1)) 98 99 static inline void 100 set_page_dirty(struct vm_page *page) 101 { 102 vm_page_dirty(page); 103 } 104 105 static inline void 106 get_page(struct vm_page *page) 107 { 108 vm_page_hold(page); 109 } 110 111 #endif /* _LINUX_MM_H_ */ 112