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 François Tigeot 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #ifndef _LINUX_MM_H_ 31 #define _LINUX_MM_H_ 32 33 #include <linux/errno.h> 34 #include <linux/kernel.h> 35 36 #define PAGE_ALIGN(addr) round_page(addr) 37 38 struct vm_area_struct { 39 vm_offset_t vm_start; 40 vm_offset_t vm_end; 41 vm_offset_t vm_pgoff; 42 vm_paddr_t vm_pfn; /* PFN For mmap. */ 43 vm_memattr_t vm_page_prot; 44 }; 45 46 /* 47 * Compute log2 of the power of two rounded up count of pages 48 * needed for size bytes. 49 */ 50 static inline int 51 get_order(unsigned long size) 52 { 53 int order; 54 55 size = (size - 1) >> PAGE_SHIFT; 56 order = 0; 57 while (size) { 58 order++; 59 size >>= 1; 60 } 61 return (order); 62 } 63 64 /* 65 * This only works via mmap ops. 66 */ 67 static inline int 68 io_remap_pfn_range(struct vm_area_struct *vma, 69 unsigned long addr, unsigned long pfn, unsigned long size, 70 vm_memattr_t prot) 71 { 72 vma->vm_page_prot = prot; 73 vma->vm_pfn = pfn; 74 75 return (0); 76 } 77 78 #define offset_in_page(off) ((off) & PAGE_MASK) 79 80 static inline void 81 set_page_dirty(struct vm_page *page) 82 { 83 vm_page_dirty(page); 84 } 85 86 #endif /* _LINUX_MM_H_ */ 87