kernel.h revision 340945 
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 340945 2018-11-26 11:09:51Z hselasky $
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
54#include <asm/byteorder.h>
55#include <asm/uaccess.h>
56
57#include <machine/stdarg.h>
58
59#define KERN_CONT       ""
60#define	KERN_EMERG	"<0>"
61#define	KERN_ALERT	"<1>"
62#define	KERN_CRIT	"<2>"
63#define	KERN_ERR	"<3>"
64#define	KERN_WARNING	"<4>"
65#define	KERN_NOTICE	"<5>"
66#define	KERN_INFO	"<6>"
67#define	KERN_DEBUG	"<7>"
68
69#define	U8_MAX		((u8)~0U)
70#define	S8_MAX		((s8)(U8_MAX >> 1))
71#define	S8_MIN		((s8)(-S8_MAX - 1))
72#define	U16_MAX		((u16)~0U)
73#define	S16_MAX		((s16)(U16_MAX >> 1))
74#define	S16_MIN		((s16)(-S16_MAX - 1))
75#define	U32_MAX		((u32)~0U)
76#define	S32_MAX		((s32)(U32_MAX >> 1))
77#define	S32_MIN		((s32)(-S32_MAX - 1))
78#define	U64_MAX		((u64)~0ULL)
79#define	S64_MAX		((s64)(U64_MAX >> 1))
80#define	S64_MIN		((s64)(-S64_MAX - 1))
81
82#define	S8_C(x)  x
83#define	U8_C(x)  x ## U
84#define	S16_C(x) x
85#define	U16_C(x) x ## U
86#define	S32_C(x) x
87#define	U32_C(x) x ## U
88#define	S64_C(x) x ## LL
89#define	U64_C(x) x ## ULL
90
91#define	BUILD_BUG()			do { CTASSERT(0); } while (0)
92#define	BUILD_BUG_ON(x)			CTASSERT(!(x))
93#define	BUILD_BUG_ON_MSG(x, msg)	BUILD_BUG_ON(x)
94#define	BUILD_BUG_ON_NOT_POWER_OF_2(x)	BUILD_BUG_ON(!powerof2(x))
95#define	BUILD_BUG_ON_INVALID(expr)	while (0) { (void)(expr); }
96
97#define	BUG()			panic("BUG at %s:%d", __FILE__, __LINE__)
98#define	BUG_ON(cond)		do {				\
99	if (cond) {						\
100		panic("BUG ON %s failed at %s:%d",		\
101		    __stringify(cond), __FILE__, __LINE__);	\
102	}							\
103} while (0)
104
105#define	WARN_ON(cond) ({					\
106      bool __ret = (cond);					\
107      if (__ret) {						\
108		printf("WARNING %s failed at %s:%d\n",		\
109		    __stringify(cond), __FILE__, __LINE__);	\
110      }								\
111      unlikely(__ret);						\
112})
113
114#define	WARN_ON_SMP(cond)	WARN_ON(cond)
115
116#define	WARN_ON_ONCE(cond) ({					\
117      static bool __warn_on_once;				\
118      bool __ret = (cond);					\
119      if (__ret && !__warn_on_once) {				\
120		__warn_on_once = 1;				\
121		printf("WARNING %s failed at %s:%d\n",		\
122		    __stringify(cond), __FILE__, __LINE__);	\
123      }								\
124      unlikely(__ret);						\
125})
126
127#define	oops_in_progress	SCHEDULER_STOPPED()
128
129#undef	ALIGN
130#define	ALIGN(x, y)		roundup2((x), (y))
131#undef PTR_ALIGN
132#define	PTR_ALIGN(p, a)		((__typeof(p))ALIGN((uintptr_t)(p), (a)))
133#define	DIV_ROUND_UP(x, n)	howmany(x, n)
134#define	__KERNEL_DIV_ROUND_UP(x, n)	howmany(x, n)
135#define	DIV_ROUND_UP_ULL(x, n)	DIV_ROUND_UP((unsigned long long)(x), (n))
136#define	FIELD_SIZEOF(t, f)	sizeof(((t *)0)->f)
137
138#define	printk(...)		printf(__VA_ARGS__)
139#define	vprintk(f, a)		vprintf(f, a)
140
141#define	asm			__asm
142
143extern void linux_dump_stack(void);
144#define	dump_stack()		linux_dump_stack()
145
146struct va_format {
147	const char *fmt;
148	va_list *va;
149};
150
151static inline int
152vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
153{
154	ssize_t ssize = size;
155	int i;
156
157	i = vsnprintf(buf, size, fmt, args);
158
159	return ((i >= ssize) ? (ssize - 1) : i);
160}
161
162static inline int
163scnprintf(char *buf, size_t size, const char *fmt, ...)
164{
165	va_list args;
166	int i;
167
168	va_start(args, fmt);
169	i = vscnprintf(buf, size, fmt, args);
170	va_end(args);
171
172	return (i);
173}
174
175/*
176 * The "pr_debug()" and "pr_devel()" macros should produce zero code
177 * unless DEBUG is defined:
178 */
179#ifdef DEBUG
180#define pr_debug(fmt, ...) \
181	log(LOG_DEBUG, fmt, ##__VA_ARGS__)
182#define pr_devel(fmt, ...) \
183	log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__)
184#else
185#define pr_debug(fmt, ...) \
186	({ if (0) log(LOG_DEBUG, fmt, ##__VA_ARGS__); 0; })
187#define pr_devel(fmt, ...) \
188	({ if (0) log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__); 0; })
189#endif
190
191#ifndef pr_fmt
192#define pr_fmt(fmt) fmt
193#endif
194
195/*
196 * Print a one-time message (analogous to WARN_ONCE() et al):
197 */
198#define printk_once(...) do {			\
199	static bool __print_once;		\
200						\
201	if (!__print_once) {			\
202		__print_once = true;		\
203		printk(__VA_ARGS__);		\
204	}					\
205} while (0)
206
207/*
208 * Log a one-time message (analogous to WARN_ONCE() et al):
209 */
210#define log_once(level,...) do {		\
211	static bool __log_once;			\
212						\
213	if (unlikely(!__log_once)) {		\
214		__log_once = true;		\
215		log(level, __VA_ARGS__);	\
216	}					\
217} while (0)
218
219#define pr_emerg(fmt, ...) \
220	log(LOG_EMERG, pr_fmt(fmt), ##__VA_ARGS__)
221#define pr_alert(fmt, ...) \
222	log(LOG_ALERT, pr_fmt(fmt), ##__VA_ARGS__)
223#define pr_crit(fmt, ...) \
224	log(LOG_CRIT, pr_fmt(fmt), ##__VA_ARGS__)
225#define pr_err(fmt, ...) \
226	log(LOG_ERR, pr_fmt(fmt), ##__VA_ARGS__)
227#define pr_warning(fmt, ...) \
228	log(LOG_WARNING, pr_fmt(fmt), ##__VA_ARGS__)
229#define pr_warn(...) \
230	pr_warning(__VA_ARGS__)
231#define pr_warn_once(fmt, ...) \
232	log_once(LOG_WARNING, pr_fmt(fmt), ##__VA_ARGS__)
233#define pr_notice(fmt, ...) \
234	log(LOG_NOTICE, pr_fmt(fmt), ##__VA_ARGS__)
235#define pr_info(fmt, ...) \
236	log(LOG_INFO, pr_fmt(fmt), ##__VA_ARGS__)
237#define pr_info_once(fmt, ...) \
238	log_once(LOG_INFO, pr_fmt(fmt), ##__VA_ARGS__)
239#define pr_cont(fmt, ...) \
240	printk(KERN_CONT fmt, ##__VA_ARGS__)
241#define	pr_warn_ratelimited(...) do {		\
242	static linux_ratelimit_t __ratelimited;	\
243	if (linux_ratelimited(&__ratelimited))	\
244		pr_warning(__VA_ARGS__);	\
245} while (0)
246
247#ifndef WARN
248#define	WARN(condition, ...) ({			\
249	bool __ret_warn_on = (condition);	\
250	if (unlikely(__ret_warn_on))		\
251		pr_warning(__VA_ARGS__);	\
252	unlikely(__ret_warn_on);		\
253})
254#endif
255
256#ifndef WARN_ONCE
257#define	WARN_ONCE(condition, ...) ({		\
258	bool __ret_warn_on = (condition);	\
259	if (unlikely(__ret_warn_on))		\
260		pr_warn_once(__VA_ARGS__);	\
261	unlikely(__ret_warn_on);		\
262})
263#endif
264
265#define container_of(ptr, type, member)				\
266({								\
267	const __typeof(((type *)0)->member) *__p = (ptr);	\
268	(type *)((uintptr_t)__p - offsetof(type, member));	\
269})
270
271#define	ARRAY_SIZE(x)	(sizeof(x) / sizeof((x)[0]))
272
273#define	u64_to_user_ptr(val)	((void *)(uintptr_t)(val))
274
275static inline unsigned long long
276simple_strtoull(const char *cp, char **endp, unsigned int base)
277{
278	return (strtouq(cp, endp, base));
279}
280
281static inline long long
282simple_strtoll(const char *cp, char **endp, unsigned int base)
283{
284	return (strtoq(cp, endp, base));
285}
286
287static inline unsigned long
288simple_strtoul(const char *cp, char **endp, unsigned int base)
289{
290	return (strtoul(cp, endp, base));
291}
292
293static inline long
294simple_strtol(const char *cp, char **endp, unsigned int base)
295{
296	return (strtol(cp, endp, base));
297}
298
299static inline int
300kstrtoul(const char *cp, unsigned int base, unsigned long *res)
301{
302	char *end;
303
304	*res = strtoul(cp, &end, base);
305
306	/* skip newline character, if any */
307	if (*end == '\n')
308		end++;
309	if (*cp == 0 || *end != 0)
310		return (-EINVAL);
311	return (0);
312}
313
314static inline int
315kstrtol(const char *cp, unsigned int base, long *res)
316{
317	char *end;
318
319	*res = strtol(cp, &end, base);
320
321	/* skip newline character, if any */
322	if (*end == '\n')
323		end++;
324	if (*cp == 0 || *end != 0)
325		return (-EINVAL);
326	return (0);
327}
328
329static inline int
330kstrtoint(const char *cp, unsigned int base, int *res)
331{
332	char *end;
333	long temp;
334
335	*res = temp = strtol(cp, &end, base);
336
337	/* skip newline character, if any */
338	if (*end == '\n')
339		end++;
340	if (*cp == 0 || *end != 0)
341		return (-EINVAL);
342	if (temp != (int)temp)
343		return (-ERANGE);
344	return (0);
345}
346
347static inline int
348kstrtouint(const char *cp, unsigned int base, unsigned int *res)
349{
350	char *end;
351	unsigned long temp;
352
353	*res = temp = strtoul(cp, &end, base);
354
355	/* skip newline character, if any */
356	if (*end == '\n')
357		end++;
358	if (*cp == 0 || *end != 0)
359		return (-EINVAL);
360	if (temp != (unsigned int)temp)
361		return (-ERANGE);
362	return (0);
363}
364
365static inline int
366kstrtou32(const char *cp, unsigned int base, u32 *res)
367{
368	char *end;
369	unsigned long temp;
370
371	*res = temp = strtoul(cp, &end, base);
372
373	/* skip newline character, if any */
374	if (*end == '\n')
375		end++;
376	if (*cp == 0 || *end != 0)
377		return (-EINVAL);
378	if (temp != (u32)temp)
379		return (-ERANGE);
380	return (0);
381}
382
383static inline int
384kstrtobool(const char *s, bool *res)
385{
386	int len;
387
388	if (s == NULL || (len = strlen(s)) == 0 || res == NULL)
389		return (-EINVAL);
390
391	/* skip newline character, if any */
392	if (s[len - 1] == '\n')
393		len--;
394
395	if (len == 1 && strchr("yY1", s[0]) != NULL)
396		*res = true;
397	else if (len == 1 && strchr("nN0", s[0]) != NULL)
398		*res = false;
399	else if (strncasecmp("on", s, len) == 0)
400		*res = true;
401	else if (strncasecmp("off", s, len) == 0)
402		*res = false;
403	else
404		return (-EINVAL);
405
406	return (0);
407}
408
409static inline int
410kstrtobool_from_user(const char __user *s, size_t count, bool *res)
411{
412	char buf[8] = {};
413
414	if (count > (sizeof(buf) - 1))
415		count = (sizeof(buf) - 1);
416
417	if (copy_from_user(buf, s, count))
418		return (-EFAULT);
419
420	return (kstrtobool(buf, res));
421}
422
423#define min(x, y)	((x) < (y) ? (x) : (y))
424#define max(x, y)	((x) > (y) ? (x) : (y))
425
426#define min3(a, b, c)	min(a, min(b,c))
427#define max3(a, b, c)	max(a, max(b,c))
428
429#define	min_t(type, x, y) ({			\
430	type __min1 = (x);			\
431	type __min2 = (y);			\
432	__min1 < __min2 ? __min1 : __min2; })
433
434#define	max_t(type, x, y) ({			\
435	type __max1 = (x);			\
436	type __max2 = (y);			\
437	__max1 > __max2 ? __max1 : __max2; })
438
439#define clamp_t(type, _x, min, max)	min_t(type, max_t(type, _x, min), max)
440#define clamp(x, lo, hi)		min( max(x,lo), hi)
441#define	clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
442
443/*
444 * This looks more complex than it should be. But we need to
445 * get the type for the ~ right in round_down (it needs to be
446 * as wide as the result!), and we want to evaluate the macro
447 * arguments just once each.
448 */
449#define __round_mask(x, y) ((__typeof__(x))((y)-1))
450#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
451#define round_down(x, y) ((x) & ~__round_mask(x, y))
452
453#define	smp_processor_id()	PCPU_GET(cpuid)
454#define	num_possible_cpus()	mp_ncpus
455#define	num_online_cpus()	mp_ncpus
456
457#if defined(__i386__) || defined(__amd64__)
458extern bool linux_cpu_has_clflush;
459#define	cpu_has_clflush		linux_cpu_has_clflush
460#endif
461
462typedef struct pm_message {
463	int event;
464} pm_message_t;
465
466/* Swap values of a and b */
467#define swap(a, b) do {			\
468	typeof(a) _swap_tmp = a;	\
469	a = b;				\
470	b = _swap_tmp;			\
471} while (0)
472
473#define	DIV_ROUND_CLOSEST(x, divisor)	(((x) + ((divisor) / 2)) / (divisor))
474
475#define	DIV_ROUND_CLOSEST_ULL(x, divisor) ({		\
476	__typeof(divisor) __d = (divisor);		\
477	unsigned long long __ret = (x) + (__d) / 2;	\
478	__ret /= __d;					\
479	__ret;						\
480})
481
482static inline uintmax_t
483mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
484{
485	uintmax_t q = (x / divisor);
486	uintmax_t r = (x % divisor);
487
488	return ((q * multiplier) + ((r * multiplier) / divisor));
489}
490
491static inline int64_t
492abs64(int64_t x)
493{
494	return (x < 0 ? -x : x);
495}
496
497typedef struct linux_ratelimit {
498	struct timeval lasttime;
499	int counter;
500} linux_ratelimit_t;
501
502static inline bool
503linux_ratelimited(linux_ratelimit_t *rl)
504{
505	return (ppsratecheck(&rl->lasttime, &rl->counter, 1));
506}
507
508#endif	/* _LINUX_KERNEL_H_ */
509