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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138/* SPDX-License-Identifier: GPL-2.0 */#ifndef _LINUX_DELAY_H#define _LINUX_DELAY_H
/* * Copyright (C) 1993 Linus Torvalds * * Delay routines, using a pre-computed "loops_per_jiffy" value. * Sleep routines using timer list timers or hrtimers. */
#include <linux/math.h>#include <linux/sched.h>#include <linux/jiffies.h>
extern unsigned long loops_per_jiffy;
#include <asm/delay.h>
/* * Using udelay() for intervals greater than a few milliseconds can * risk overflow for high loops_per_jiffy (high bogomips) machines. The * mdelay() provides a wrapper to prevent this. For delays greater * than MAX_UDELAY_MS milliseconds, the wrapper is used. Architecture * specific values can be defined in asm-???/delay.h as an override. * The 2nd mdelay() definition ensures GCC will optimize away the * while loop for the common cases where n <= MAX_UDELAY_MS -- Paul G. */#ifndef MAX_UDELAY_MS#define MAX_UDELAY_MS 5#endif
#ifndef mdelay/** * mdelay - Inserting a delay based on milliseconds with busy waiting * @n: requested delay in milliseconds * * See udelay() for basic information about mdelay() and it's variants. * * Please double check, whether mdelay() is the right way to go or whether a * refactoring of the code is the better variant to be able to use msleep() * instead. */#define mdelay(n) (\ (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \ ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))#endif
#ifndef ndelaystatic inline void ndelay(unsigned long x){ udelay(DIV_ROUND_UP(x, 1000));}#define ndelay(x) ndelay(x)#endif
extern unsigned long lpj_fine;void calibrate_delay(void);unsigned long calibrate_delay_is_known(void);void __attribute__((weak)) calibration_delay_done(void);void msleep(unsigned int msecs);unsigned long msleep_interruptible(unsigned int msecs);void usleep_range_state(unsigned long min, unsigned long max, unsigned int state);
/** * usleep_range - Sleep for an approximate time * @min: Minimum time in microseconds to sleep * @max: Maximum time in microseconds to sleep * * For basic information please refer to usleep_range_state(). * * The task will be in the state TASK_UNINTERRUPTIBLE during the sleep. */static inline void usleep_range(unsigned long min, unsigned long max){ usleep_range_state(min, max, TASK_UNINTERRUPTIBLE);}
/** * usleep_range_idle - Sleep for an approximate time with idle time accounting * @min: Minimum time in microseconds to sleep * @max: Maximum time in microseconds to sleep * * For basic information please refer to usleep_range_state(). * * The sleeping task has the state TASK_IDLE during the sleep to prevent * contribution to the load average. */static inline void usleep_range_idle(unsigned long min, unsigned long max){ usleep_range_state(min, max, TASK_IDLE);}
/** * ssleep - wrapper for seconds around msleep * @seconds: Requested sleep duration in seconds * * Please refer to msleep() for detailed information. */static inline void ssleep(unsigned int seconds){ msleep(seconds * 1000);}
static const unsigned int max_slack_shift = 2;#define USLEEP_RANGE_UPPER_BOUND ((TICK_NSEC << max_slack_shift) / NSEC_PER_USEC)
/** * fsleep - flexible sleep which autoselects the best mechanism * @usecs: requested sleep duration in microseconds * * fsleep() selects the best mechanism that will provide maximum 25% slack * to the requested sleep duration. Therefore it uses: * * * udelay() loop for sleep durations <= 10 microseconds to avoid hrtimer * overhead for really short sleep durations. * * usleep_range() for sleep durations which would lead with the usage of * msleep() to a slack larger than 25%. This depends on the granularity of * jiffies. * * msleep() for all other sleep durations. * * Note: When %CONFIG_HIGH_RES_TIMERS is not set, all sleeps are processed with * the granularity of jiffies and the slack might exceed 25% especially for * short sleep durations. */static inline void fsleep(unsigned long usecs){ if (usecs <= 10) udelay(usecs); else if (usecs < USLEEP_RANGE_UPPER_BOUND) usleep_range(usecs, usecs + (usecs >> max_slack_shift)); else msleep(DIV_ROUND_UP(usecs, USEC_PER_MSEC));}
#endif /* defined(_LINUX_DELAY_H) */