1 /* 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6 * Copyright (c) 2014-2020 François Tigeot <ftigeot@wolfpond.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 #ifndef _LINUX_KERNEL_H_ 31 #define _LINUX_KERNEL_H_ 32 33 #include <sys/stdarg.h> 34 #include <linux/stddef.h> 35 #include <linux/types.h> 36 #include <linux/compiler.h> 37 #include <linux/bitops.h> 38 #include <linux/log2.h> 39 #include <linux/typecheck.h> 40 #include <linux/printk.h> 41 42 #include <sys/systm.h> 43 #include <sys/param.h> 44 #include <sys/libkern.h> 45 #include <sys/stat.h> 46 #include <sys/endian.h> 47 48 #define U8_MAX ((u8)~0U) 49 #define U16_MAX ((u16)~0U) 50 #define U32_MAX ((u32)~0U) 51 #define U64_MAX ((u64)~0ULL) 52 #define S64_MAX ((s64)(U64_MAX>>1)) 53 54 #include <machine/limits.h> /* LONG_MAX etc... */ 55 56 #undef ALIGN 57 #define ALIGN(x, y) roundup2((x), (y)) 58 #define IS_ALIGNED(x, y) (((x) & ((y) - 1)) == 0) 59 #define DIV_ROUND_UP howmany 60 #define DIV_ROUND_UP_ULL(X, N) DIV_ROUND_UP((unsigned long long)(X), (N)) 61 62 #define udelay(t) DELAY(t) 63 64 #define container_of(ptr, type, member) \ 65 ({ \ 66 __typeof(((type *)0)->member) *_p = (ptr); \ 67 (type *)((char *)_p - offsetof(type, member)); \ 68 }) 69 70 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 71 72 #define simple_strtoul strtoul 73 #define simple_strtol strtol 74 75 #define min(x, y) ((x) < (y) ? (x) : (y)) 76 #define max(x, y) ((x) > (y) ? (x) : (y)) 77 78 #define min3(a, b, c) min(a, min(b,c)) 79 #define max3(a, b, c) max(a, max(b,c)) 80 81 #define min_t(type, _x, _y) ((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y)) 82 #define max_t(type, _x, _y) ((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y)) 83 84 #define clamp_t(type, _x, min, max) min_t(type, max_t(type, _x, min), max) 85 #define clamp(x, lo, hi) min( max(x,lo), hi) 86 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) 87 88 /* 89 * This looks more complex than it should be. But we need to 90 * get the type for the ~ right in round_down (it needs to be 91 * as wide as the result!), and we want to evaluate the macro 92 * arguments just once each. 93 */ 94 #define __round_mask(x, y) ((__typeof__(x))((y)-1)) 95 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 96 #define round_down(x, y) ((x) & ~__round_mask(x, y)) 97 98 #define num_possible_cpus() mp_ncpus 99 100 typedef struct pm_message { 101 int event; 102 } pm_message_t; 103 104 /* Swap values of a and b */ 105 #define swap(a, b) \ 106 ({ \ 107 typeof(a) _swap_tmp = a; \ 108 a = b; \ 109 b = _swap_tmp; \ 110 }) 111 112 #define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) /2)) / (divisor)) 113 114 static inline uintmax_t 115 mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor) 116 { 117 uintmax_t q = (x / divisor); 118 uintmax_t r = (x % divisor); 119 120 return ((q * multiplier) + ((r * multiplier) / divisor)); 121 } 122 123 static inline int64_t abs64(int64_t x) 124 { 125 return (x < 0 ? -x : x); 126 } 127 128 #define DIV_ROUND_CLOSEST_ULL(ll, d) \ 129 ({ unsigned long long _tmp = (ll)+(d)/2; do_div(_tmp, d); _tmp; }) 130 131 #define upper_32_bits(n) ((u32)(((n) >> 16) >> 16)) 132 #define lower_32_bits(n) ((u32)(n)) 133 134 /* Byteorder compat layer */ 135 #if _BYTE_ORDER == _BIG_ENDIAN 136 #define __BIG_ENDIAN 4321 137 #else 138 #define __LITTLE_ENDIAN 1234 139 #endif 140 141 #define cpu_to_le16(x) htole16(x) 142 #define le16_to_cpu(x) le16toh(x) 143 #define cpu_to_le32(x) htole32(x) 144 #define le32_to_cpu(x) le32toh(x) 145 #define le32_to_cpup(x) le32toh(*x) 146 147 #define cpu_to_be16(x) htobe16(x) 148 #define be16_to_cpu(x) be16toh(x) 149 #define cpu_to_be32(x) htobe32(x) 150 #define be32_to_cpu(x) be32toh(x) 151 #define be32_to_cpup(x) be32toh(*x) 152 153 static inline int __must_check 154 kstrtouint(const char *s, unsigned int base, unsigned int *res) 155 { 156 *(res) = strtol(s,0,base); 157 158 return 0; 159 } 160 161 char *kvasprintf(int flags, const char *format, va_list ap); 162 char *kasprintf(int flags, const char *format, ...); 163 164 static inline void __user * 165 u64_to_user_ptr(u64 address) 166 { 167 return (void __user *)(uintptr_t)address; 168 } 169 170 static inline void 171 might_sleep(void) 172 { 173 } 174 175 #define might_sleep_if(cond) 176 177 #define snprintf ksnprintf 178 #define sprintf ksprintf 179 180 static inline int __printf(3, 0) 181 vsnprintf(char *buf, size_t size, const char *fmt, va_list args) 182 { 183 return kvsnprintf(buf, size, fmt, args); 184 } 185 186 static inline int __printf(3, 0) 187 vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 188 { 189 int ret; 190 191 if (size == 0) 192 return 0; 193 194 ret = vsnprintf(buf, size, fmt, args); 195 if (ret < size) 196 return ret; 197 198 return size - 1; 199 } 200 201 static inline int __printf(3, 4) 202 scnprintf(char *buf, size_t size, const char *fmt, ...) 203 { 204 va_list args; 205 int i; 206 207 va_start(args, fmt); 208 i = vscnprintf(buf, size, fmt, args); 209 va_end(args); 210 211 return (i); 212 } 213 214 static inline int 215 kstrtol(const char *cp, unsigned int base, long *res) 216 { 217 char *end; 218 219 *res = strtol(cp, &end, base); 220 221 /* skip newline character, if any */ 222 if (*end == '\n') 223 end++; 224 if (*cp == 0 || *end != 0) 225 return (-EINVAL); 226 return (0); 227 } 228 229 #define oops_in_progress (panicstr != NULL) 230 231 enum lockdep_ok { 232 LOCKDEP_STILL_OK, 233 LOCKDEP_NOW_UNRELIABLE 234 }; 235 236 #define TAINT_MACHINE_CHECK 4 237 238 static inline void 239 add_taint(unsigned flag, enum lockdep_ok lo) 240 { 241 } 242 243 #define STUB() do { kprintf("%s: stub\n", __func__); } while(0); 244 245 #endif /* _LINUX_KERNEL_H_ */ 246