Contributors: 32
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| John Stultz |
329 |
36.00% |
8 |
10.81% |
| Thomas Gleixner |
196 |
21.44% |
19 |
25.68% |
| Magnus Damm |
86 |
9.41% |
4 |
5.41% |
| Russell King |
55 |
6.02% |
3 |
4.05% |
| Lakshmi Sowjanya D |
30 |
3.28% |
1 |
1.35% |
| Feng Tang |
28 |
3.06% |
2 |
2.70% |
| Martin Schwidefsky |
27 |
2.95% |
4 |
5.41% |
| Alexander Kuleshov |
26 |
2.84% |
1 |
1.35% |
| Stephen Warren |
19 |
2.08% |
2 |
2.70% |
| Stephen Boyd |
17 |
1.86% |
1 |
1.35% |
| Rob Herring |
12 |
1.31% |
2 |
2.70% |
| Baolin Wang |
11 |
1.20% |
1 |
1.35% |
| Paul E. McKenney |
11 |
1.20% |
3 |
4.05% |
| Marc Zyngier |
10 |
1.09% |
1 |
1.35% |
| Daniel Lezcano |
7 |
0.77% |
5 |
6.76% |
| Jim Cromie |
7 |
0.77% |
1 |
1.35% |
| Andrew Lutomirski |
6 |
0.66% |
1 |
1.35% |
| Jason Wessel |
6 |
0.66% |
1 |
1.35% |
| H. Peter Anvin |
4 |
0.44% |
1 |
1.35% |
| Peter Zijlstra |
4 |
0.44% |
1 |
1.35% |
| David Lechner |
3 |
0.33% |
1 |
1.35% |
| Vincenzo Frascino |
3 |
0.33% |
1 |
1.35% |
| Jon Hunter |
3 |
0.33% |
1 |
1.35% |
| Eric Dumazet |
3 |
0.33% |
1 |
1.35% |
| Tony Luck |
2 |
0.22% |
1 |
1.35% |
| Arnd Bergmann |
2 |
0.22% |
1 |
1.35% |
| Linus Torvalds (pre-git) |
2 |
0.22% |
1 |
1.35% |
| Ingo Molnar |
1 |
0.11% |
1 |
1.35% |
| Chris Metcalf |
1 |
0.11% |
1 |
1.35% |
| Greg Kroah-Hartman |
1 |
0.11% |
1 |
1.35% |
| Matthias Kaehlcke |
1 |
0.11% |
1 |
1.35% |
| Kusanagi Kouichi |
1 |
0.11% |
1 |
1.35% |
| Total |
914 |
|
74 |
|
/* SPDX-License-Identifier: GPL-2.0 */
/* linux/include/linux/clocksource.h
*
* This file contains the structure definitions for clocksources.
*
* If you are not a clocksource, or timekeeping code, you should
* not be including this file!
*/
#ifndef _LINUX_CLOCKSOURCE_H
#define _LINUX_CLOCKSOURCE_H
#include <linux/types.h>
#include <linux/timex.h>
#include <linux/time.h>
#include <linux/list.h>
#include <linux/cache.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/clocksource_ids.h>
#include <asm/div64.h>
#include <asm/io.h>
struct clocksource_base;
struct clocksource;
struct module;
#if defined(CONFIG_ARCH_CLOCKSOURCE_DATA) || \
defined(CONFIG_GENERIC_GETTIMEOFDAY)
#include <asm/clocksource.h>
#endif
#include <vdso/clocksource.h>
/**
* struct clocksource - hardware abstraction for a free running counter
* Provides mostly state-free accessors to the underlying hardware.
* This is the structure used for system time.
*
* @read: Returns a cycle value, passes clocksource as argument
* @mask: Bitmask for two's complement
* subtraction of non 64 bit counters
* @mult: Cycle to nanosecond multiplier
* @shift: Cycle to nanosecond divisor (power of two)
* @max_idle_ns: Maximum idle time permitted by the clocksource (nsecs)
* @maxadj: Maximum adjustment value to mult (~11%)
* @uncertainty_margin: Maximum uncertainty in nanoseconds per half second.
* Zero says to use default WATCHDOG_THRESHOLD.
* @archdata: Optional arch-specific data
* @max_cycles: Maximum safe cycle value which won't overflow on
* multiplication
* @name: Pointer to clocksource name
* @list: List head for registration (internal)
* @freq_khz: Clocksource frequency in khz.
* @rating: Rating value for selection (higher is better)
* To avoid rating inflation the following
* list should give you a guide as to how
* to assign your clocksource a rating
* 1-99: Unfit for real use
* Only available for bootup and testing purposes.
* 100-199: Base level usability.
* Functional for real use, but not desired.
* 200-299: Good.
* A correct and usable clocksource.
* 300-399: Desired.
* A reasonably fast and accurate clocksource.
* 400-499: Perfect
* The ideal clocksource. A must-use where
* available.
* @id: Defaults to CSID_GENERIC. The id value is captured
* in certain snapshot functions to allow callers to
* validate the clocksource from which the snapshot was
* taken.
* @flags: Flags describing special properties
* @base: Hardware abstraction for clock on which a clocksource
* is based
* @enable: Optional function to enable the clocksource
* @disable: Optional function to disable the clocksource
* @suspend: Optional suspend function for the clocksource
* @resume: Optional resume function for the clocksource
* @mark_unstable: Optional function to inform the clocksource driver that
* the watchdog marked the clocksource unstable
* @tick_stable: Optional function called periodically from the watchdog
* code to provide stable synchronization points
* @wd_list: List head to enqueue into the watchdog list (internal)
* @cs_last: Last clocksource value for clocksource watchdog
* @wd_last: Last watchdog value corresponding to @cs_last
* @owner: Module reference, must be set by clocksource in modules
*
* Note: This struct is not used in hotpathes of the timekeeping code
* because the timekeeper caches the hot path fields in its own data
* structure, so no cache line alignment is required,
*
* The pointer to the clocksource itself is handed to the read
* callback. If you need extra information there you can wrap struct
* clocksource into your own struct. Depending on the amount of
* information you need you should consider to cache line align that
* structure.
*/
struct clocksource {
u64 (*read)(struct clocksource *cs);
u64 mask;
u32 mult;
u32 shift;
u64 max_idle_ns;
u32 maxadj;
u32 uncertainty_margin;
#ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
struct arch_clocksource_data archdata;
#endif
u64 max_cycles;
const char *name;
struct list_head list;
u32 freq_khz;
int rating;
enum clocksource_ids id;
enum vdso_clock_mode vdso_clock_mode;
unsigned long flags;
struct clocksource_base *base;
int (*enable)(struct clocksource *cs);
void (*disable)(struct clocksource *cs);
void (*suspend)(struct clocksource *cs);
void (*resume)(struct clocksource *cs);
void (*mark_unstable)(struct clocksource *cs);
void (*tick_stable)(struct clocksource *cs);
/* private: */
#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
/* Watchdog related data, used by the framework */
struct list_head wd_list;
u64 cs_last;
u64 wd_last;
#endif
struct module *owner;
};
/*
* Clock source flags bits::
*/
#define CLOCK_SOURCE_IS_CONTINUOUS 0x01
#define CLOCK_SOURCE_MUST_VERIFY 0x02
#define CLOCK_SOURCE_WATCHDOG 0x10
#define CLOCK_SOURCE_VALID_FOR_HRES 0x20
#define CLOCK_SOURCE_UNSTABLE 0x40
#define CLOCK_SOURCE_SUSPEND_NONSTOP 0x80
#define CLOCK_SOURCE_RESELECT 0x100
#define CLOCK_SOURCE_VERIFY_PERCPU 0x200
/* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
static inline u32 clocksource_freq2mult(u32 freq, u32 shift_constant, u64 from)
{
/* freq = cyc/from
* mult/2^shift = ns/cyc
* mult = ns/cyc * 2^shift
* mult = from/freq * 2^shift
* mult = from * 2^shift / freq
* mult = (from<<shift) / freq
*/
u64 tmp = ((u64)from) << shift_constant;
tmp += freq/2; /* round for do_div */
do_div(tmp, freq);
return (u32)tmp;
}
/**
* clocksource_khz2mult - calculates mult from khz and shift
* @khz: Clocksource frequency in KHz
* @shift_constant: Clocksource shift factor
*
* Helper functions that converts a khz counter frequency to a timsource
* multiplier, given the clocksource shift value
*/
static inline u32 clocksource_khz2mult(u32 khz, u32 shift_constant)
{
return clocksource_freq2mult(khz, shift_constant, NSEC_PER_MSEC);
}
/**
* clocksource_hz2mult - calculates mult from hz and shift
* @hz: Clocksource frequency in Hz
* @shift_constant: Clocksource shift factor
*
* Helper functions that converts a hz counter
* frequency to a timsource multiplier, given the
* clocksource shift value
*/
static inline u32 clocksource_hz2mult(u32 hz, u32 shift_constant)
{
return clocksource_freq2mult(hz, shift_constant, NSEC_PER_SEC);
}
/**
* clocksource_cyc2ns - converts clocksource cycles to nanoseconds
* @cycles: cycles
* @mult: cycle to nanosecond multiplier
* @shift: cycle to nanosecond divisor (power of two)
*
* Converts clocksource cycles to nanoseconds, using the given @mult and @shift.
* The code is optimized for performance and is not intended to work
* with absolute clocksource cycles (as those will easily overflow),
* but is only intended to be used with relative (delta) clocksource cycles.
*
* XXX - This could use some mult_lxl_ll() asm optimization
*/
static inline s64 clocksource_cyc2ns(u64 cycles, u32 mult, u32 shift)
{
return ((u64) cycles * mult) >> shift;
}
extern int clocksource_unregister(struct clocksource*);
extern void clocksource_touch_watchdog(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
extern void clocksource_suspend(void);
extern void clocksource_resume(void);
extern struct clocksource * __init clocksource_default_clock(void);
extern void clocksource_mark_unstable(struct clocksource *cs);
extern void
clocksource_start_suspend_timing(struct clocksource *cs, u64 start_cycles);
extern u64 clocksource_stop_suspend_timing(struct clocksource *cs, u64 now);
extern u64
clocks_calc_max_nsecs(u32 mult, u32 shift, u32 maxadj, u64 mask, u64 *max_cycles);
extern void
clocks_calc_mult_shift(u32 *mult, u32 *shift, u32 from, u32 to, u32 minsec);
/*
* Don't call __clocksource_register_scale directly, use
* clocksource_register_hz/khz
*/
extern int
__clocksource_register_scale(struct clocksource *cs, u32 scale, u32 freq);
extern void
__clocksource_update_freq_scale(struct clocksource *cs, u32 scale, u32 freq);
/*
* Don't call this unless you are a default clocksource
* (AKA: jiffies) and absolutely have to.
*/
static inline int __clocksource_register(struct clocksource *cs)
{
return __clocksource_register_scale(cs, 1, 0);
}
static inline int clocksource_register_hz(struct clocksource *cs, u32 hz)
{
return __clocksource_register_scale(cs, 1, hz);
}
static inline int clocksource_register_khz(struct clocksource *cs, u32 khz)
{
return __clocksource_register_scale(cs, 1000, khz);
}
static inline void __clocksource_update_freq_hz(struct clocksource *cs, u32 hz)
{
__clocksource_update_freq_scale(cs, 1, hz);
}
static inline void __clocksource_update_freq_khz(struct clocksource *cs, u32 khz)
{
__clocksource_update_freq_scale(cs, 1000, khz);
}
#ifdef CONFIG_ARCH_CLOCKSOURCE_INIT
extern void clocksource_arch_init(struct clocksource *cs);
#else
static inline void clocksource_arch_init(struct clocksource *cs) { }
#endif
extern int timekeeping_notify(struct clocksource *clock);
extern u64 clocksource_mmio_readl_up(struct clocksource *);
extern u64 clocksource_mmio_readl_down(struct clocksource *);
extern u64 clocksource_mmio_readw_up(struct clocksource *);
extern u64 clocksource_mmio_readw_down(struct clocksource *);
extern int clocksource_mmio_init(void __iomem *, const char *,
unsigned long, int, unsigned, u64 (*)(struct clocksource *));
extern int clocksource_i8253_init(void);
#define TIMER_OF_DECLARE(name, compat, fn) \
OF_DECLARE_1_RET(timer, name, compat, fn)
#ifdef CONFIG_TIMER_PROBE
extern void timer_probe(void);
#else
static inline void timer_probe(void) {}
#endif
#define TIMER_ACPI_DECLARE(name, table_id, fn) \
ACPI_DECLARE_PROBE_ENTRY(timer, name, table_id, 0, NULL, 0, fn)
static inline unsigned int clocksource_get_max_watchdog_retry(void)
{
/*
* When system is in the boot phase or under heavy workload, there
* can be random big latencies during the clocksource/watchdog
* read, so allow retries to filter the noise latency. As the
* latency's frequency and maximum value goes up with the number of
* CPUs, scale the number of retries with the number of online
* CPUs.
*/
return (ilog2(num_online_cpus()) / 2) + 1;
}
void clocksource_verify_percpu(struct clocksource *cs);
/**
* struct clocksource_base - hardware abstraction for clock on which a clocksource
* is based
* @id: Defaults to CSID_GENERIC. The id value is used for conversion
* functions which require that the current clocksource is based
* on a clocksource_base with a particular ID in certain snapshot
* functions to allow callers to validate the clocksource from
* which the snapshot was taken.
* @freq_khz: Nominal frequency of the base clock in kHz
* @offset: Offset between the base clock and the clocksource
* @numerator: Numerator of the clock ratio between base clock and the clocksource
* @denominator: Denominator of the clock ratio between base clock and the clocksource
*/
struct clocksource_base {
enum clocksource_ids id;
u32 freq_khz;
u64 offset;
u32 numerator;
u32 denominator;
};
#endif /* _LINUX_CLOCKSOURCE_H */