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 #define VM_SHARED (1 << 17) 67 68 #define VMA_MAX_PREFAULT_RECORD 1 69 70 #define FOLL_WRITE (1 << 0) 71 #define FOLL_FORCE (1 << 1) 72 73 #define VM_FAULT_OOM (1 << 0) 74 #define VM_FAULT_SIGBUS (1 << 1) 75 #define VM_FAULT_MAJOR (1 << 2) 76 #define VM_FAULT_WRITE (1 << 3) 77 #define VM_FAULT_HWPOISON (1 << 4) 78 #define VM_FAULT_HWPOISON_LARGE (1 << 5) 79 #define VM_FAULT_SIGSEGV (1 << 6) 80 #define VM_FAULT_NOPAGE (1 << 7) 81 #define VM_FAULT_LOCKED (1 << 8) 82 #define VM_FAULT_RETRY (1 << 9) 83 #define VM_FAULT_FALLBACK (1 << 10) 84 85 #define FAULT_FLAG_WRITE (1 << 0) 86 #define FAULT_FLAG_MKWRITE (1 << 1) 87 #define FAULT_FLAG_ALLOW_RETRY (1 << 2) 88 #define FAULT_FLAG_RETRY_NOWAIT (1 << 3) 89 #define FAULT_FLAG_KILLABLE (1 << 4) 90 #define FAULT_FLAG_TRIED (1 << 5) 91 #define FAULT_FLAG_USER (1 << 6) 92 #define FAULT_FLAG_REMOTE (1 << 7) 93 #define FAULT_FLAG_INSTRUCTION (1 << 8) 94 95 #define fault_flag_allow_retry_first(flags) \ 96 (((flags) & (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_TRIED)) == FAULT_FLAG_ALLOW_RETRY) 97 98 typedef int (*pte_fn_t)(linux_pte_t *, pgtable_t, unsigned long addr, void *data); 99 100 struct vm_area_struct { 101 vm_offset_t vm_start; 102 vm_offset_t vm_end; 103 vm_offset_t vm_pgoff; 104 pgprot_t vm_page_prot; 105 unsigned long vm_flags; 106 struct mm_struct *vm_mm; 107 void *vm_private_data; 108 const struct vm_operations_struct *vm_ops; 109 struct linux_file *vm_file; 110 111 /* internal operation */ 112 vm_paddr_t vm_pfn; /* PFN for memory map */ 113 vm_size_t vm_len; /* length for memory map */ 114 vm_pindex_t vm_pfn_first; 115 int vm_pfn_count; 116 int *vm_pfn_pcount; 117 vm_object_t vm_obj; 118 vm_map_t vm_cached_map; 119 TAILQ_ENTRY(vm_area_struct) vm_entry; 120 }; 121 122 struct vm_fault { 123 unsigned int flags; 124 pgoff_t pgoff; 125 union { 126 /* user-space address */ 127 void *virtual_address; /* < 4.11 */ 128 unsigned long address; /* >= 4.11 */ 129 }; 130 struct page *page; 131 struct vm_area_struct *vma; 132 }; 133 134 struct vm_operations_struct { 135 void (*open) (struct vm_area_struct *); 136 void (*close) (struct vm_area_struct *); 137 int (*fault) (struct vm_area_struct *, struct vm_fault *); 138 int (*access) (struct vm_area_struct *, unsigned long, void *, int, int); 139 }; 140 141 struct sysinfo { 142 uint64_t totalram; 143 uint64_t totalhigh; 144 uint32_t mem_unit; 145 }; 146 147 /* 148 * Compute log2 of the power of two rounded up count of pages 149 * needed for size bytes. 150 */ 151 static inline int 152 get_order(unsigned long size) 153 { 154 int order; 155 156 size = (size - 1) >> PAGE_SHIFT; 157 order = 0; 158 while (size) { 159 order++; 160 size >>= 1; 161 } 162 return (order); 163 } 164 165 static inline void * 166 lowmem_page_address(struct page *page) 167 { 168 return (page_address(page)); 169 } 170 171 /* 172 * This only works via memory map operations. 173 */ 174 static inline int 175 io_remap_pfn_range(struct vm_area_struct *vma, 176 unsigned long addr, unsigned long pfn, unsigned long size, 177 vm_memattr_t prot) 178 { 179 vma->vm_page_prot = prot; 180 vma->vm_pfn = pfn; 181 vma->vm_len = size; 182 183 return (0); 184 } 185 186 static inline int 187 apply_to_page_range(struct mm_struct *mm, unsigned long address, 188 unsigned long size, pte_fn_t fn, void *data) 189 { 190 return (-ENOTSUP); 191 } 192 193 int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, 194 unsigned long size); 195 196 static inline int 197 remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, 198 unsigned long pfn, unsigned long size, pgprot_t prot) 199 { 200 return (-ENOTSUP); 201 } 202 203 static inline unsigned long 204 vma_pages(struct vm_area_struct *vma) 205 { 206 return ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT); 207 } 208 209 #define offset_in_page(off) ((off) & (PAGE_SIZE - 1)) 210 211 static inline void 212 set_page_dirty(struct vm_page *page) 213 { 214 vm_page_dirty(page); 215 } 216 217 static inline void 218 mark_page_accessed(struct vm_page *page) 219 { 220 vm_page_reference(page); 221 } 222 223 static inline void 224 get_page(struct vm_page *page) 225 { 226 vm_page_wire(page); 227 } 228 229 extern long 230 get_user_pages(unsigned long start, unsigned long nr_pages, 231 int gup_flags, struct page **, 232 struct vm_area_struct **); 233 234 extern int 235 __get_user_pages_fast(unsigned long start, int nr_pages, int write, 236 struct page **); 237 238 extern long 239 get_user_pages_remote(struct task_struct *, struct mm_struct *, 240 unsigned long start, unsigned long nr_pages, 241 int gup_flags, struct page **, 242 struct vm_area_struct **); 243 244 static inline void 245 put_page(struct vm_page *page) 246 { 247 vm_page_unwire(page, PQ_ACTIVE); 248 } 249 250 #define copy_highpage(to, from) pmap_copy_page(from, to) 251 252 static inline pgprot_t 253 vm_get_page_prot(unsigned long vm_flags) 254 { 255 return (vm_flags & VM_PROT_ALL); 256 } 257 258 static inline vm_page_t 259 vmalloc_to_page(const void *addr) 260 { 261 vm_paddr_t paddr; 262 263 paddr = pmap_kextract((vm_offset_t)addr); 264 return (PHYS_TO_VM_PAGE(paddr)); 265 } 266 267 extern int is_vmalloc_addr(const void *addr); 268 void si_meminfo(struct sysinfo *si); 269 270 #endif /* _LINUX_MM_H_ */ 271