git/linux-nf
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git synced 2026-04-03 23:38:12 -04:00
Code Issues Packages Projects Releases Wiki Activity

timekeeping: Provide time getters for auxiliary clocks

Browse Source 
Provide interfaces similar to the ktime_get*() family which provide access
to the auxiliary clocks.

These interfaces have a boolean return value, which indicates whether the
accessed clock is valid or not.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250625183757.868342628@linutronix.de
This commit is contained in:
Thomas Gleixner
2025-06-25 20:38:31 +02:00
parent 9f7729480a
commit 05bc6e6290
3 changed files with 81 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/posix-timers.h
View File

@@ -37,6 +37,11 @@ static inline int clockid_to_fd(const clockid_t clk)
return ~(clk >> 3);
}
static inline bool clockid_aux_valid(clockid_t id)
{
return IS_ENABLED(CONFIG_POSIX_AUX_CLOCKS) && id >= CLOCK_AUX && id <= CLOCK_AUX_LAST;
}
#ifdef CONFIG_POSIX_TIMERS
#include <linux/signal_types.h>

11
include/linux/timekeeping.h
View File

@@ -263,6 +263,17 @@ extern bool timekeeping_rtc_skipresume(void);
extern void timekeeping_inject_sleeptime64(const struct timespec64 *delta);
/*
* Auxiliary clock interfaces
*/
#ifdef CONFIG_POSIX_AUX_CLOCKS
extern bool ktime_get_aux(clockid_t id, ktime_t *kt);
extern bool ktime_get_aux_ts64(clockid_t id, struct timespec64 *kt);
#else
static inline bool ktime_get_aux(clockid_t id, ktime_t *kt) { return false; }
static inline bool ktime_get_aux_ts64(clockid_t id, struct timespec64 *kt) { return false; }
#endif
/**
* struct system_time_snapshot - simultaneous raw/real time capture with
* counter value

65
kernel/time/timekeeping.c
View File

@@ -2664,6 +2664,18 @@ EXPORT_SYMBOL(hardpps);
*/
static unsigned long aux_timekeepers;
static inline unsigned int clockid_to_tkid(unsigned int id)
{
return TIMEKEEPER_AUX_FIRST + id - CLOCK_AUX;
}
static inline struct tk_data *aux_get_tk_data(clockid_t id)
{
if (!clockid_aux_valid(id))
return NULL;
return &timekeeper_data[clockid_to_tkid(id)];
}
/* Invoked from timekeeping after a clocksource change */
static void tk_aux_update_clocksource(void)
{
@@ -2684,6 +2696,59 @@ static void tk_aux_update_clocksource(void)
}
}
/**
* ktime_get_aux - Get time for a AUX clock
* @id: ID of the clock to read (CLOCK_AUX...)
* @kt: Pointer to ktime_t to store the time stamp
*
* Returns: True if the timestamp is valid, false otherwise
*/
bool ktime_get_aux(clockid_t id, ktime_t *kt)
{
struct tk_data *aux_tkd = aux_get_tk_data(id);
struct timekeeper *aux_tk;
unsigned int seq;
ktime_t base;
u64 nsecs;
WARN_ON(timekeeping_suspended);
if (!aux_tkd)
return false;
aux_tk = &aux_tkd->timekeeper;
do {
seq = read_seqcount_begin(&aux_tkd->seq);
if (!aux_tk->clock_valid)
return false;
base = ktime_add(aux_tk->tkr_mono.base, aux_tk->offs_aux);
nsecs = timekeeping_get_ns(&aux_tk->tkr_mono);
} while (read_seqcount_retry(&aux_tkd->seq, seq));
*kt = ktime_add_ns(base, nsecs);
return true;
}
EXPORT_SYMBOL_GPL(ktime_get_aux);
/**
* ktime_get_aux_ts64 - Get time for a AUX clock
* @id: ID of the clock to read (CLOCK_AUX...)
* @ts: Pointer to timespec64 to store the time stamp
*
* Returns: True if the timestamp is valid, false otherwise
*/
bool ktime_get_aux_ts64(clockid_t id, struct timespec64 *ts)
{
ktime_t now;
if (!ktime_get_aux(id, &now))
return false;
*ts = ktime_to_timespec64(now);
return true;
}
EXPORT_SYMBOL_GPL(ktime_get_aux_ts64);
static __init void tk_aux_setup(void)
{
for (int i = TIMEKEEPER_AUX_FIRST; i <= TIMEKEEPER_AUX_LAST; i++)