kernel.h revision 331756
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) 2014-2015 Fran��ois Tigeot 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 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/kernel.h 331756 2018-03-30 02:04:46Z emaste $ 31 */ 32#ifndef _LINUX_KERNEL_H_ 33#define _LINUX_KERNEL_H_ 34 35#include <sys/cdefs.h> 36#include <sys/types.h> 37#include <sys/systm.h> 38#include <sys/param.h> 39#include <sys/libkern.h> 40#include <sys/stat.h> 41#include <sys/smp.h> 42#include <sys/stddef.h> 43#include <sys/syslog.h> 44#include <sys/time.h> 45 46#include <linux/bitops.h> 47#include <linux/compiler.h> 48#include <linux/errno.h> 49#include <linux/sched.h> 50#include <linux/types.h> 51#include <linux/jiffies.h> 52#include <linux/log2.h> 53#include <asm/byteorder.h> 54 55#include <machine/stdarg.h> 56 57#define KERN_CONT "" 58#define KERN_EMERG "<0>" 59#define KERN_ALERT "<1>" 60#define KERN_CRIT "<2>" 61#define KERN_ERR "<3>" 62#define KERN_WARNING "<4>" 63#define KERN_NOTICE "<5>" 64#define KERN_INFO "<6>" 65#define KERN_DEBUG "<7>" 66 67#define U8_MAX ((u8)~0U) 68#define S8_MAX ((s8)(U8_MAX >> 1)) 69#define S8_MIN ((s8)(-S8_MAX - 1)) 70#define U16_MAX ((u16)~0U) 71#define S16_MAX ((s16)(U16_MAX >> 1)) 72#define S16_MIN ((s16)(-S16_MAX - 1)) 73#define U32_MAX ((u32)~0U) 74#define S32_MAX ((s32)(U32_MAX >> 1)) 75#define S32_MIN ((s32)(-S32_MAX - 1)) 76#define U64_MAX ((u64)~0ULL) 77#define S64_MAX ((s64)(U64_MAX >> 1)) 78#define S64_MIN ((s64)(-S64_MAX - 1)) 79 80#define S8_C(x) x 81#define U8_C(x) x ## U 82#define S16_C(x) x 83#define U16_C(x) x ## U 84#define S32_C(x) x 85#define U32_C(x) x ## U 86#define S64_C(x) x ## LL 87#define U64_C(x) x ## ULL 88 89#define BUILD_BUG() do { CTASSERT(0); } while (0) 90#define BUILD_BUG_ON(x) CTASSERT(!(x)) 91#define BUILD_BUG_ON_MSG(x, msg) BUILD_BUG_ON(x) 92#define BUILD_BUG_ON_NOT_POWER_OF_2(x) BUILD_BUG_ON(!powerof2(x)) 93#define BUILD_BUG_ON_INVALID(expr) while (0) { (void)(expr); } 94 95#define BUG() panic("BUG at %s:%d", __FILE__, __LINE__) 96#define BUG_ON(cond) do { \ 97 if (cond) { \ 98 panic("BUG ON %s failed at %s:%d", \ 99 __stringify(cond), __FILE__, __LINE__); \ 100 } \ 101} while (0) 102 103#define WARN_ON(cond) ({ \ 104 bool __ret = (cond); \ 105 if (__ret) { \ 106 printf("WARNING %s failed at %s:%d\n", \ 107 __stringify(cond), __FILE__, __LINE__); \ 108 } \ 109 unlikely(__ret); \ 110}) 111 112#define WARN_ON_SMP(cond) WARN_ON(cond) 113 114#define WARN_ON_ONCE(cond) ({ \ 115 static bool __warn_on_once; \ 116 bool __ret = (cond); \ 117 if (__ret && !__warn_on_once) { \ 118 __warn_on_once = 1; \ 119 printf("WARNING %s failed at %s:%d\n", \ 120 __stringify(cond), __FILE__, __LINE__); \ 121 } \ 122 unlikely(__ret); \ 123}) 124 125#define oops_in_progress SCHEDULER_STOPPED() 126 127#undef ALIGN 128#define ALIGN(x, y) roundup2((x), (y)) 129#undef PTR_ALIGN 130#define PTR_ALIGN(p, a) ((__typeof(p))ALIGN((uintptr_t)(p), (a))) 131#define DIV_ROUND_UP(x, n) howmany(x, n) 132#define DIV_ROUND_UP_ULL(x, n) DIV_ROUND_UP((unsigned long long)(x), (n)) 133#define FIELD_SIZEOF(t, f) sizeof(((t *)0)->f) 134 135#define printk(...) printf(__VA_ARGS__) 136#define vprintk(f, a) vprintf(f, a) 137 138struct va_format { 139 const char *fmt; 140 va_list *va; 141}; 142 143static inline int 144vscnprintf(char *buf, size_t size, const char *fmt, va_list args) 145{ 146 ssize_t ssize = size; 147 int i; 148 149 i = vsnprintf(buf, size, fmt, args); 150 151 return ((i >= ssize) ? (ssize - 1) : i); 152} 153 154static inline int 155scnprintf(char *buf, size_t size, const char *fmt, ...) 156{ 157 va_list args; 158 int i; 159 160 va_start(args, fmt); 161 i = vscnprintf(buf, size, fmt, args); 162 va_end(args); 163 164 return (i); 165} 166 167/* 168 * The "pr_debug()" and "pr_devel()" macros should produce zero code 169 * unless DEBUG is defined: 170 */ 171#ifdef DEBUG 172#define pr_debug(fmt, ...) \ 173 log(LOG_DEBUG, fmt, ##__VA_ARGS__) 174#define pr_devel(fmt, ...) \ 175 log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__) 176#else 177#define pr_debug(fmt, ...) \ 178 ({ if (0) log(LOG_DEBUG, fmt, ##__VA_ARGS__); 0; }) 179#define pr_devel(fmt, ...) \ 180 ({ if (0) log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__); 0; }) 181#endif 182 183#ifndef pr_fmt 184#define pr_fmt(fmt) fmt 185#endif 186 187/* 188 * Print a one-time message (analogous to WARN_ONCE() et al): 189 */ 190#define printk_once(...) do { \ 191 static bool __print_once; \ 192 \ 193 if (!__print_once) { \ 194 __print_once = true; \ 195 printk(__VA_ARGS__); \ 196 } \ 197} while (0) 198 199/* 200 * Log a one-time message (analogous to WARN_ONCE() et al): 201 */ 202#define log_once(level,...) do { \ 203 static bool __log_once; \ 204 \ 205 if (unlikely(!__log_once)) { \ 206 __log_once = true; \ 207 log(level, __VA_ARGS__); \ 208 } \ 209} while (0) 210 211#define pr_emerg(fmt, ...) \ 212 log(LOG_EMERG, pr_fmt(fmt), ##__VA_ARGS__) 213#define pr_alert(fmt, ...) \ 214 log(LOG_ALERT, pr_fmt(fmt), ##__VA_ARGS__) 215#define pr_crit(fmt, ...) \ 216 log(LOG_CRIT, pr_fmt(fmt), ##__VA_ARGS__) 217#define pr_err(fmt, ...) \ 218 log(LOG_ERR, pr_fmt(fmt), ##__VA_ARGS__) 219#define pr_warning(fmt, ...) \ 220 log(LOG_WARNING, pr_fmt(fmt), ##__VA_ARGS__) 221#define pr_warn(...) \ 222 pr_warning(__VA_ARGS__) 223#define pr_warn_once(fmt, ...) \ 224 log_once(LOG_WARNING, pr_fmt(fmt), ##__VA_ARGS__) 225#define pr_notice(fmt, ...) \ 226 log(LOG_NOTICE, pr_fmt(fmt), ##__VA_ARGS__) 227#define pr_info(fmt, ...) \ 228 log(LOG_INFO, pr_fmt(fmt), ##__VA_ARGS__) 229#define pr_info_once(fmt, ...) \ 230 log_once(LOG_INFO, pr_fmt(fmt), ##__VA_ARGS__) 231#define pr_cont(fmt, ...) \ 232 printk(KERN_CONT fmt, ##__VA_ARGS__) 233#define pr_warn_ratelimited(...) do { \ 234 static linux_ratelimit_t __ratelimited; \ 235 if (linux_ratelimited(&__ratelimited)) \ 236 pr_warning(__VA_ARGS__); \ 237} while (0) 238 239#ifndef WARN 240#define WARN(condition, ...) ({ \ 241 bool __ret_warn_on = (condition); \ 242 if (unlikely(__ret_warn_on)) \ 243 pr_warning(__VA_ARGS__); \ 244 unlikely(__ret_warn_on); \ 245}) 246#endif 247 248#ifndef WARN_ONCE 249#define WARN_ONCE(condition, ...) ({ \ 250 bool __ret_warn_on = (condition); \ 251 if (unlikely(__ret_warn_on)) \ 252 pr_warn_once(__VA_ARGS__); \ 253 unlikely(__ret_warn_on); \ 254}) 255#endif 256 257#define container_of(ptr, type, member) \ 258({ \ 259 const __typeof(((type *)0)->member) *__p = (ptr); \ 260 (type *)((uintptr_t)__p - offsetof(type, member)); \ 261}) 262 263#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 264 265#define u64_to_user_ptr(val) ((void *)(uintptr_t)(val)) 266 267static inline unsigned long long 268simple_strtoull(const char *cp, char **endp, unsigned int base) 269{ 270 return (strtouq(cp, endp, base)); 271} 272 273static inline long long 274simple_strtoll(const char *cp, char **endp, unsigned int base) 275{ 276 return (strtoq(cp, endp, base)); 277} 278 279static inline unsigned long 280simple_strtoul(const char *cp, char **endp, unsigned int base) 281{ 282 return (strtoul(cp, endp, base)); 283} 284 285static inline long 286simple_strtol(const char *cp, char **endp, unsigned int base) 287{ 288 return (strtol(cp, endp, base)); 289} 290 291static inline int 292kstrtoul(const char *cp, unsigned int base, unsigned long *res) 293{ 294 char *end; 295 296 *res = strtoul(cp, &end, base); 297 298 if (*cp == 0 || *end != 0) 299 return (-EINVAL); 300 return (0); 301} 302 303static inline int 304kstrtol(const char *cp, unsigned int base, long *res) 305{ 306 char *end; 307 308 *res = strtol(cp, &end, base); 309 310 if (*cp == 0 || *end != 0) 311 return (-EINVAL); 312 return (0); 313} 314 315static inline int 316kstrtoint(const char *cp, unsigned int base, int *res) 317{ 318 char *end; 319 long temp; 320 321 *res = temp = strtol(cp, &end, base); 322 323 if (*cp == 0 || *end != 0) 324 return (-EINVAL); 325 if (temp != (int)temp) 326 return (-ERANGE); 327 return (0); 328} 329 330static inline int 331kstrtouint(const char *cp, unsigned int base, unsigned int *res) 332{ 333 char *end; 334 unsigned long temp; 335 336 *res = temp = strtoul(cp, &end, base); 337 338 if (*cp == 0 || *end != 0) 339 return (-EINVAL); 340 if (temp != (unsigned int)temp) 341 return (-ERANGE); 342 return (0); 343} 344 345static inline int 346kstrtou32(const char *cp, unsigned int base, u32 *res) 347{ 348 char *end; 349 unsigned long temp; 350 351 *res = temp = strtoul(cp, &end, base); 352 353 if (*cp == 0 || *end != 0) 354 return (-EINVAL); 355 if (temp != (u32)temp) 356 return (-ERANGE); 357 return (0); 358} 359 360#define min(x, y) ((x) < (y) ? (x) : (y)) 361#define max(x, y) ((x) > (y) ? (x) : (y)) 362 363#define min3(a, b, c) min(a, min(b,c)) 364#define max3(a, b, c) max(a, max(b,c)) 365 366#define min_t(type, x, y) ({ \ 367 type __min1 = (x); \ 368 type __min2 = (y); \ 369 __min1 < __min2 ? __min1 : __min2; }) 370 371#define max_t(type, x, y) ({ \ 372 type __max1 = (x); \ 373 type __max2 = (y); \ 374 __max1 > __max2 ? __max1 : __max2; }) 375 376#define clamp_t(type, _x, min, max) min_t(type, max_t(type, _x, min), max) 377#define clamp(x, lo, hi) min( max(x,lo), hi) 378#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi) 379 380/* 381 * This looks more complex than it should be. But we need to 382 * get the type for the ~ right in round_down (it needs to be 383 * as wide as the result!), and we want to evaluate the macro 384 * arguments just once each. 385 */ 386#define __round_mask(x, y) ((__typeof__(x))((y)-1)) 387#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1) 388#define round_down(x, y) ((x) & ~__round_mask(x, y)) 389 390#define smp_processor_id() PCPU_GET(cpuid) 391#define num_possible_cpus() mp_ncpus 392#define num_online_cpus() mp_ncpus 393 394#if defined(__i386__) || defined(__amd64__) 395extern bool linux_cpu_has_clflush; 396#define cpu_has_clflush linux_cpu_has_clflush 397#endif 398 399typedef struct pm_message { 400 int event; 401} pm_message_t; 402 403/* Swap values of a and b */ 404#define swap(a, b) do { \ 405 typeof(a) _swap_tmp = a; \ 406 a = b; \ 407 b = _swap_tmp; \ 408} while (0) 409 410#define DIV_ROUND_CLOSEST(x, divisor) (((x) + ((divisor) / 2)) / (divisor)) 411 412#define DIV_ROUND_CLOSEST_ULL(x, divisor) ({ \ 413 __typeof(divisor) __d = (divisor); \ 414 unsigned long long __ret = (x) + (__d) / 2; \ 415 __ret /= __d; \ 416 __ret; \ 417}) 418 419static inline uintmax_t 420mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor) 421{ 422 uintmax_t q = (x / divisor); 423 uintmax_t r = (x % divisor); 424 425 return ((q * multiplier) + ((r * multiplier) / divisor)); 426} 427 428static inline int64_t 429abs64(int64_t x) 430{ 431 return (x < 0 ? -x : x); 432} 433 434typedef struct linux_ratelimit { 435 struct timeval lasttime; 436 int counter; 437} linux_ratelimit_t; 438 439static inline bool 440linux_ratelimited(linux_ratelimit_t *rl) 441{ 442 return (ppsratecheck(&rl->lasttime, &rl->counter, 1)); 443} 444 445#endif /* _LINUX_KERNEL_H_ */ 446