1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2017 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 * $FreeBSD$ 32 */ 33 #ifndef _LINUX_MM_H_ 34 #define _LINUX_MM_H_ 35 36 #include <linux/spinlock.h> 37 #include <linux/gfp.h> 38 #include <linux/kernel.h> 39 #include <linux/mm_types.h> 40 #include <linux/pfn.h> 41 #include <linux/list.h> 42 43 #include <asm/pgtable.h> 44 45 #define PAGE_ALIGN(x) ALIGN(x, PAGE_SIZE) 46 47 /* 48 * Make sure our LinuxKPI defined virtual memory flags don't conflict 49 * with the ones defined by FreeBSD: 50 */ 51 CTASSERT((VM_PROT_ALL & -(1 << 8)) == 0); 52 53 #define VM_READ VM_PROT_READ 54 #define VM_WRITE VM_PROT_WRITE 55 #define VM_EXEC VM_PROT_EXECUTE 56 57 #define VM_PFNINTERNAL (1 << 8) /* FreeBSD private flag to vm_insert_pfn() */ 58 #define VM_MIXEDMAP (1 << 9) 59 #define VM_NORESERVE (1 << 10) 60 #define VM_PFNMAP (1 << 11) 61 #define VM_IO (1 << 12) 62 #define VM_MAYWRITE (1 << 13) 63 #define VM_DONTCOPY (1 << 14) 64 #define VM_DONTEXPAND (1 << 15) 65 #define VM_DONTDUMP (1 << 16) 66 67 #define VMA_MAX_PREFAULT_RECORD 1 68 69 #define FOLL_WRITE (1 << 0) 70 #define FOLL_FORCE (1 << 1) 71 72 #define VM_FAULT_OOM (1 << 0) 73 #define VM_FAULT_SIGBUS (1 << 1) 74 #define VM_FAULT_MAJOR (1 << 2) 75 #define VM_FAULT_WRITE (1 << 3) 76 #define VM_FAULT_HWPOISON (1 << 4) 77 #define VM_FAULT_HWPOISON_LARGE (1 << 5) 78 #define VM_FAULT_SIGSEGV (1 << 6) 79 #define VM_FAULT_NOPAGE (1 << 7) 80 #define VM_FAULT_LOCKED (1 << 8) 81 #define VM_FAULT_RETRY (1 << 9) 82 #define VM_FAULT_FALLBACK (1 << 10) 83 84 #define FAULT_FLAG_WRITE (1 << 0) 85 #define FAULT_FLAG_MKWRITE (1 << 1) 86 #define FAULT_FLAG_ALLOW_RETRY (1 << 2) 87 #define FAULT_FLAG_RETRY_NOWAIT (1 << 3) 88 #define FAULT_FLAG_KILLABLE (1 << 4) 89 #define FAULT_FLAG_TRIED (1 << 5) 90 #define FAULT_FLAG_USER (1 << 6) 91 #define FAULT_FLAG_REMOTE (1 << 7) 92 #define FAULT_FLAG_INSTRUCTION (1 << 8) 93 94 typedef int (*pte_fn_t)(linux_pte_t *, pgtable_t, unsigned long addr, void *data); 95 96 struct vm_area_struct { 97 vm_offset_t vm_start; 98 vm_offset_t vm_end; 99 vm_offset_t vm_pgoff; 100 pgprot_t vm_page_prot; 101 unsigned long vm_flags; 102 struct mm_struct *vm_mm; 103 void *vm_private_data; 104 const struct vm_operations_struct *vm_ops; 105 struct linux_file *vm_file; 106 107 /* internal operation */ 108 vm_paddr_t vm_pfn; /* PFN for memory map */ 109 vm_size_t vm_len; /* length for memory map */ 110 vm_pindex_t vm_pfn_first; 111 int vm_pfn_count; 112 int *vm_pfn_pcount; 113 vm_object_t vm_obj; 114 vm_map_t vm_cached_map; 115 TAILQ_ENTRY(vm_area_struct) vm_entry; 116 }; 117 118 struct vm_fault { 119 unsigned int flags; 120 pgoff_t pgoff; 121 void *virtual_address; /* user-space address */ 122 struct page *page; 123 }; 124 125 struct vm_operations_struct { 126 void (*open) (struct vm_area_struct *); 127 void (*close) (struct vm_area_struct *); 128 int (*fault) (struct vm_area_struct *, struct vm_fault *); 129 }; 130 131 /* 132 * Compute log2 of the power of two rounded up count of pages 133 * needed for size bytes. 134 */ 135 static inline int 136 get_order(unsigned long size) 137 { 138 int order; 139 140 size = (size - 1) >> PAGE_SHIFT; 141 order = 0; 142 while (size) { 143 order++; 144 size >>= 1; 145 } 146 return (order); 147 } 148 149 static inline void * 150 lowmem_page_address(struct page *page) 151 { 152 return (page_address(page)); 153 } 154 155 /* 156 * This only works via memory map operations. 157 */ 158 static inline int 159 io_remap_pfn_range(struct vm_area_struct *vma, 160 unsigned long addr, unsigned long pfn, unsigned long size, 161 vm_memattr_t prot) 162 { 163 vma->vm_page_prot = prot; 164 vma->vm_pfn = pfn; 165 vma->vm_len = size; 166 167 return (0); 168 } 169 170 static inline int 171 apply_to_page_range(struct mm_struct *mm, unsigned long address, 172 unsigned long size, pte_fn_t fn, void *data) 173 { 174 return (-ENOTSUP); 175 } 176 177 static inline int 178 zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, 179 unsigned long size) 180 { 181 return (-ENOTSUP); 182 } 183 184 static inline int 185 remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, 186 unsigned long pfn, unsigned long size, pgprot_t prot) 187 { 188 return (-ENOTSUP); 189 } 190 191 static inline unsigned long 192 vma_pages(struct vm_area_struct *vma) 193 { 194 return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT); 195 } 196 197 #define offset_in_page(off) ((off) & (PAGE_SIZE - 1)) 198 199 static inline void 200 set_page_dirty(struct vm_page *page) 201 { 202 vm_page_dirty(page); 203 } 204 205 static inline void 206 set_page_dirty_lock(struct vm_page *page) 207 { 208 vm_page_lock(page); 209 vm_page_dirty(page); 210 vm_page_unlock(page); 211 } 212 213 static inline void 214 mark_page_accessed(struct vm_page *page) 215 { 216 vm_page_reference(page); 217 } 218 219 static inline void 220 get_page(struct vm_page *page) 221 { 222 vm_page_lock(page); 223 vm_page_hold(page); 224 vm_page_wire(page); 225 vm_page_unlock(page); 226 } 227 228 extern long 229 get_user_pages(unsigned long start, unsigned long nr_pages, 230 int gup_flags, struct page **, 231 struct vm_area_struct **); 232 233 extern int 234 __get_user_pages_fast(unsigned long start, int nr_pages, int write, 235 struct page **); 236 237 extern long 238 get_user_pages_remote(struct task_struct *, struct mm_struct *, 239 unsigned long start, unsigned long nr_pages, 240 int gup_flags, struct page **, 241 struct vm_area_struct **); 242 243 static inline void 244 put_page(struct vm_page *page) 245 { 246 vm_page_lock(page); 247 vm_page_unwire(page, PQ_ACTIVE); 248 vm_page_unhold(page); 249 vm_page_unlock(page); 250 } 251 252 #define copy_highpage(to, from) pmap_copy_page(from, to) 253 254 static inline pgprot_t 255 vm_get_page_prot(unsigned long vm_flags) 256 { 257 return (vm_flags & VM_PROT_ALL); 258 } 259 260 static inline vm_page_t 261 vmalloc_to_page(const void *addr) 262 { 263 vm_paddr_t paddr; 264 265 paddr = pmap_kextract((vm_offset_t)addr); 266 return (PHYS_TO_VM_PAGE(paddr)); 267 } 268 269 extern int is_vmalloc_addr(const void *addr); 270 271 #endif /* _LINUX_MM_H_ */ 272