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Subject[PATCHv7 06/33] alarmtimer: Provide get_timespec() callback
Date
From: Andrei Vagin <avagin@gmail.com>

The upcoming support for time namespaces requires to have access to:
- The time in a task's time namespace for sys_clock_gettime()
- The time in the root name space for common_timer_get()

Wire up alarm bases with get_timespec().

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Co-developed-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
include/linux/posix-timers.h | 3 +++
kernel/time/alarmtimer.c | 8 ++++++--
kernel/time/posix-timers.c | 4 ++--
3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 3d10c84a97a9..d535d52eb3ca 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -230,4 +230,7 @@ void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);

void posixtimer_rearm(struct kernel_siginfo *info);
+
+int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp);
+int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp);
#endif
diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index 22b6f9b133b2..73a5458194c7 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -37,12 +37,15 @@
* @lock: Lock for syncrhonized access to the base
* @timerqueue: Timerqueue head managing the list of events
* @get_ktime: Function to read the time correlating to the base
+ * @get_timespec: Function to read the namespace time correlating to the base
* @base_clockid: clockid for the base
*/
static struct alarm_base {
spinlock_t lock;
struct timerqueue_head timerqueue;
ktime_t (*get_ktime)(void);
+ int (*get_timespec)(const clockid_t which_clock,
+ struct timespec64 *tp);
clockid_t base_clockid;
} alarm_bases[ALARM_NUMTYPE];

@@ -670,8 +673,7 @@ static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp
if (!alarmtimer_get_rtcdev())
return -EINVAL;

- *tp = ktime_to_timespec64(base->get_ktime());
- return 0;
+ return base->get_timespec(base->base_clockid, tp);
}

/**
@@ -883,8 +885,10 @@ static int __init alarmtimer_init(void)
/* Initialize alarm bases */
alarm_bases[ALARM_REALTIME].base_clockid = CLOCK_REALTIME;
alarm_bases[ALARM_REALTIME].get_ktime = &ktime_get_real;
+ alarm_bases[ALARM_REALTIME].get_timespec = posix_get_realtime_timespec,
alarm_bases[ALARM_BOOTTIME].base_clockid = CLOCK_BOOTTIME;
alarm_bases[ALARM_BOOTTIME].get_ktime = &ktime_get_boottime;
+ alarm_bases[ALARM_BOOTTIME].get_timespec = posix_get_boottime_timespec;
for (i = 0; i < ALARM_NUMTYPE; i++) {
timerqueue_init_head(&alarm_bases[i].timerqueue);
spin_lock_init(&alarm_bases[i].lock);
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 68d4690cc225..e65241a46038 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -165,7 +165,7 @@ static inline void unlock_timer(struct k_itimer *timr, unsigned long flags)
}

/* Get clock_realtime */
-static int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp)
+int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp)
{
ktime_get_real_ts64(tp);
return 0;
@@ -222,7 +222,7 @@ static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *
return 0;
}

-static int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp)
+int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 *tp)
{
ktime_get_boottime_ts64(tp);
return 0;
--
2.23.0
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