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/bug.h> 37 #include <linux/kernel.h> 38 39 #include <asm/page.h> 40 #include <asm/pgtable.h> 41 42 #define PAGE_ALIGN(addr) round_page(addr) 43 44 struct vm_area_struct { 45 vm_offset_t vm_start; 46 vm_offset_t vm_end; 47 vm_offset_t vm_pgoff; 48 vm_paddr_t vm_pfn; /* PFN 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 /* 71 * This only works via mmap ops. 72 */ 73 static inline int 74 io_remap_pfn_range(struct vm_area_struct *vma, 75 unsigned long addr, unsigned long pfn, unsigned long size, 76 vm_memattr_t prot) 77 { 78 vma->vm_page_prot = prot; 79 vma->vm_pfn = pfn; 80 81 return (0); 82 } 83 84 static inline unsigned long 85 vma_pages(struct vm_area_struct *vma) 86 { 87 unsigned long size; 88 89 size = vma->vm_end - vma->vm_start; 90 91 return size >> PAGE_SHIFT; 92 } 93 94 #define offset_in_page(off) ((off) & PAGE_MASK) 95 96 static inline void 97 set_page_dirty(struct vm_page *page) 98 { 99 vm_page_dirty(page); 100 } 101 102 /* 103 * Allocate multiple contiguous pages. The DragonFly code can only do 104 * multiple allocations via the free page reserve. Linux does not appear 105 * to restrict the address space, so neither do we. 106 */ 107 static inline struct vm_page * 108 alloc_pages(int flags, u_int order) 109 { 110 size_t bytes = PAGE_SIZE << order; 111 struct vm_page *pgs; 112 113 pgs = vm_page_alloc_contig(0LLU, ~0LLU, bytes, bytes, bytes, 114 VM_MEMATTR_DEFAULT); 115 kprintf("alloc_pages order %u vm_pages=%p\n", order, pgs); 116 return pgs; 117 } 118 119 /* 120 * Free multiple contiguous pages 121 */ 122 static inline void 123 __free_pages(struct vm_page *pgs, u_int order) 124 { 125 size_t bytes = PAGE_SIZE << order; 126 127 vm_page_free_contig(pgs, bytes); 128 } 129 130 static inline void 131 get_page(struct vm_page *page) 132 { 133 vm_page_hold(page); 134 } 135 136 #endif /* _LINUX_MM_H_ */ 137