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