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 Matthew Dillon <dillon@backplane.com> 7 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org> 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 36 #include <linux/mmdebug.h> 37 #include <linux/gfp.h> 38 #include <linux/bug.h> 39 #include <linux/list.h> 40 #include <linux/mmzone.h> 41 #include <linux/rbtree.h> 42 #include <linux/atomic.h> 43 #include <linux/mm_types.h> 44 #include <linux/err.h> 45 #include <linux/shrinker.h> 46 47 #include <asm/page.h> 48 #include <asm/pgtable.h> 49 #include <asm/processor.h> 50 51 static inline struct page * 52 nth_page(struct page *page, int n) 53 { 54 return page + n; 55 } 56 57 #define PAGE_ALIGN(addr) round_page(addr) 58 59 #define VM_FAULT_RETRY 0x0400 60 61 #define FAULT_FLAG_ALLOW_RETRY 0x04 62 #define FAULT_FLAG_RETRY_NOWAIT 0x08 63 64 struct vm_fault { 65 struct vm_area_struct *vma; 66 unsigned int flags; 67 void __user *virtual_address; 68 }; 69 70 #define VM_FAULT_NOPAGE 0x0001 71 #define VM_FAULT_SIGBUS 0x0002 72 #define VM_FAULT_OOM 0x0004 73 74 #define VM_DONTDUMP 0x0001 75 #define VM_DONTEXPAND 0x0002 76 #define VM_IO 0x0004 77 #define VM_MIXEDMAP 0x0008 78 79 struct vm_operations_struct { 80 int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); 81 void (*open)(struct vm_area_struct *vma); 82 void (*close)(struct vm_area_struct *vma); 83 int (*access)(struct vm_area_struct *vma, unsigned long addr, 84 void *buf, int len, int write); 85 }; 86 87 /* 88 * Compute log2 of the power of two rounded up count of pages 89 * needed for size bytes. 90 */ 91 static inline int 92 get_order(unsigned long size) 93 { 94 int order; 95 96 size = (size - 1) >> PAGE_SHIFT; 97 order = 0; 98 while (size) { 99 order++; 100 size >>= 1; 101 } 102 return (order); 103 } 104 105 /* 106 * This only works via mmap ops. 107 */ 108 static inline int 109 io_remap_pfn_range(struct vm_area_struct *vma, 110 unsigned long addr, unsigned long pfn, unsigned long size, 111 vm_memattr_t prot) 112 { 113 vma->vm_page_prot = prot; 114 vma->vm_pfn = pfn; 115 116 return (0); 117 } 118 119 static inline unsigned long 120 vma_pages(struct vm_area_struct *vma) 121 { 122 unsigned long size; 123 124 size = vma->vm_end - vma->vm_start; 125 126 return size >> PAGE_SHIFT; 127 } 128 129 #define offset_in_page(off) ((unsigned long)(off) & PAGE_MASK) 130 131 static inline void 132 set_page_dirty(struct page *page) 133 { 134 vm_page_dirty((struct vm_page *)page); 135 } 136 137 static inline void 138 get_page(struct vm_page *page) 139 { 140 vm_page_hold(page); 141 } 142 143 extern vm_paddr_t Realmem; 144 145 static inline unsigned long get_num_physpages(void) 146 { 147 return Realmem / PAGE_SIZE; 148 } 149 150 int is_vmalloc_addr(const void *x); 151 152 static inline void 153 unmap_mapping_range(struct address_space *mapping, 154 loff_t const holebegin, loff_t const holelen, int even_cows) 155 { 156 } 157 158 #define VM_SHARED 0x00000008 159 160 #define VM_PFNMAP 0x00000400 161 162 static inline struct page * 163 vmalloc_to_page(const void *addr) 164 { 165 vm_paddr_t paddr; 166 167 paddr = pmap_kextract((vm_offset_t)addr); 168 return (struct page *)(PHYS_TO_VM_PAGE(paddr)); 169 } 170 171 static inline void 172 put_page(struct page *page) 173 { 174 vm_page_busy_wait((struct vm_page *)page, FALSE, "i915gem"); 175 vm_page_unwire((struct vm_page *)page, 1); 176 vm_page_wakeup((struct vm_page *)page); 177 } 178 179 static inline void * 180 page_address(const struct page *page) 181 { 182 return (void *)VM_PAGE_TO_PHYS((const struct vm_page *)page); 183 } 184 185 void * kvmalloc_array(size_t n, size_t size, gfp_t flags); 186 187 #define kvfree(addr) kfree(addr) 188 189 #define FOLL_WRITE 0x01 190 191 #endif /* _LINUX_MM_H_ */ 192