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 * 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 #ifndef _LINUX_MM_H_ 32 #define _LINUX_MM_H_ 33 34 #include <linux/errno.h> 35 #include <linux/gfp.h> 36 #include <linux/kernel.h> 37 38 #include <asm/page.h> 39 #include <asm/pgtable.h> 40 41 #define PAGE_ALIGN(addr) round_page(addr) 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_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 /* 70 * This only works via mmap ops. 71 */ 72 static inline int 73 io_remap_pfn_range(struct vm_area_struct *vma, 74 unsigned long addr, unsigned long pfn, unsigned long size, 75 vm_memattr_t prot) 76 { 77 vma->vm_page_prot = prot; 78 vma->vm_pfn = pfn; 79 80 return (0); 81 } 82 83 static inline unsigned long 84 vma_pages(struct vm_area_struct *vma) 85 { 86 unsigned long size; 87 88 size = vma->vm_end - vma->vm_start; 89 90 return size >> PAGE_SHIFT; 91 } 92 93 #define offset_in_page(off) ((off) & PAGE_MASK) 94 95 static inline void 96 set_page_dirty(struct vm_page *page) 97 { 98 vm_page_dirty(page); 99 } 100 101 /* 102 * Allocate multiple contiguous pages. The DragonFly code can only do 103 * multiple allocations via the free page reserve. Linux does not appear 104 * to restrict the address space, so neither do we. 105 */ 106 static inline struct vm_page * 107 alloc_pages(int flags, u_int order) 108 { 109 size_t bytes = PAGE_SIZE << order; 110 struct vm_page *pgs; 111 112 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 113 VM_MEMATTR_DEFAULT); 114 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs); 115 return pgs; 116 } 117 118 /* 119 * Free multiple contiguous pages 120 */ 121 static inline void 122 __free_pages(struct vm_page *pgs, u_int order) 123 { 124 size_t bytes = PAGE_SIZE << order; 125 126 vm_page_free_contig(pgs, bytes); 127 } 128 129 static inline void 130 get_page(struct vm_page *page) 131 { 132 vm_page_hold(page); 133 } 134 135 #endif /* _LINUX_MM_H_ */ 136