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Merge branch 'fortglx/3.9/time' of git://git.linaro.org/people/jstultz/linux into timers/core 

Trivial conflict in arch/x86/Kconfig

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
hifive-unleashed-5.1
Thomas Gleixner 2013-02-04 11:03:03 +01:00
parent a9037430c6 6f16eebe1f
commit 90889a635a
15 changed files with 141 additions and 22 deletions
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2
MAINTAINERS
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@ -6598,7 +6598,7 @@ F: drivers/dma/dw_dmac_regs.h
F: drivers/dma/dw_dmac.c
TIMEKEEPING, NTP
M: John Stultz <johnstul@us.ibm.com>
M: John Stultz <john.stultz@linaro.org>
M: Thomas Gleixner <tglx@linutronix.de>
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
S: Supported

2
arch/powerpc/kernel/time.c
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@ -668,7 +668,7 @@ int update_persistent_clock(struct timespec now)
struct rtc_time tm;
if (!ppc_md.set_rtc_time)
return 0;
return -ENODEV;
to_tm(now.tv_sec + 1 + timezone_offset, &tm);
tm.tm_year -= 1900;

1
arch/x86/Kconfig
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@ -106,6 +106,7 @@ config X86
select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
select GENERIC_TIME_VSYSCALL if X86_64
select KTIME_SCALAR if X86_32
select ALWAYS_USE_PERSISTENT_CLOCK
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_CONTEXT_TRACKING if X86_64

3
arch/x86/kernel/tsc.c
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@ -623,7 +623,8 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
ns_now = __cycles_2_ns(tsc_now);
if (cpu_khz) {
*scale = (NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR)/cpu_khz;
*scale = ((NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR) +
cpu_khz / 2) / cpu_khz;
*offset = ns_now - mult_frac(tsc_now, *scale,
(1UL << CYC2NS_SCALE_FACTOR));
}

12
drivers/rtc/Kconfig
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@ -20,14 +20,24 @@ if RTC_CLASS
config RTC_HCTOSYS
bool "Set system time from RTC on startup and resume"
default y
depends on !ALWAYS_USE_PERSISTENT_CLOCK
help
If you say yes here, the system time (wall clock) will be set using
the value read from a specified RTC device. This is useful to avoid
unnecessary fsck runs at boot time, and to network better.
config RTC_SYSTOHC
bool "Set the RTC time based on NTP synchronization"
default y
depends on !ALWAYS_USE_PERSISTENT_CLOCK
help
If you say yes here, the system time (wall clock) will be stored
in the RTC specified by RTC_HCTOSYS_DEVICE approximately every 11
minutes if userspace reports synchronized NTP status.
config RTC_HCTOSYS_DEVICE
string "RTC used to set the system time"
depends on RTC_HCTOSYS = y
depends on RTC_HCTOSYS = y || RTC_SYSTOHC = y
default "rtc0"
help
The RTC device that will be used to (re)initialize the system

1
drivers/rtc/Makefile
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@ -6,6 +6,7 @@ ccflags-$(CONFIG_RTC_DEBUG) := -DDEBUG
obj-$(CONFIG_RTC_LIB) += rtc-lib.o
obj-$(CONFIG_RTC_HCTOSYS) += hctosys.o
obj-$(CONFIG_RTC_SYSTOHC) += systohc.o
obj-$(CONFIG_RTC_CLASS) += rtc-core.o
rtc-core-y := class.o interface.o

7
drivers/rtc/class.c
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@ -50,6 +50,10 @@ static int rtc_suspend(struct device *dev, pm_message_t mesg)
struct rtc_device *rtc = to_rtc_device(dev);
struct rtc_time tm;
struct timespec delta, delta_delta;
if (has_persistent_clock())
return 0;
if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
return 0;
@ -88,6 +92,9 @@ static int rtc_resume(struct device *dev)
struct timespec new_system, new_rtc;
struct timespec sleep_time;
if (has_persistent_clock())
return 0;
rtc_hctosys_ret = -ENODEV;
if (strcmp(dev_name(&rtc->dev), CONFIG_RTC_HCTOSYS_DEVICE) != 0)
return 0;

44
drivers/rtc/systohc.c 100644
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@ -0,0 +1,44 @@
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
*/
#include <linux/rtc.h>
#include <linux/time.h>
/**
* rtc_set_ntp_time - Save NTP synchronized time to the RTC
* @now: Current time of day
*
* Replacement for the NTP platform function update_persistent_clock
* that stores time for later retrieval by rtc_hctosys.
*
* Returns 0 on successful RTC update, -ENODEV if a RTC update is not
* possible at all, and various other -errno for specific temporary failure
* cases.
*
* If temporary failure is indicated the caller should try again 'soon'
*/
int rtc_set_ntp_time(struct timespec now)
{
struct rtc_device *rtc;
struct rtc_time tm;
int err = -ENODEV;
if (now.tv_nsec < (NSEC_PER_SEC >> 1))
rtc_time_to_tm(now.tv_sec, &tm);
else
rtc_time_to_tm(now.tv_sec + 1, &tm);
rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
if (rtc) {
/* rtc_hctosys exclusively uses UTC, so we call set_time here,
* not set_mmss. */
if (rtc->ops && (rtc->ops->set_time || rtc->ops->set_mmss))
err = rtc_set_time(rtc, &tm);
rtc_class_close(rtc);
}
return err;
}

10
fs/pstore/ram.c
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@ -167,12 +167,16 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
{
char *hdr;
struct timeval timestamp;
struct timespec timestamp;
size_t len;
do_gettimeofday(&timestamp);
/* Report zeroed timestamp if called before timekeeping has resumed. */
if (__getnstimeofday(&timestamp)) {
timestamp.tv_sec = 0;
timestamp.tv_nsec = 0;
}
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
(long)timestamp.tv_sec, (long)timestamp.tv_usec);
(long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000));
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);

1
include/linux/rtc.h
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@ -138,6 +138,7 @@ extern void rtc_device_unregister(struct rtc_device *rtc);
extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
extern int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs);
extern int rtc_set_ntp_time(struct timespec now);
int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
extern int rtc_read_alarm(struct rtc_device *rtc,
struct rtc_wkalrm *alrm);

12
include/linux/time.h
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@ -115,6 +115,17 @@ static inline bool timespec_valid_strict(const struct timespec *ts)
return true;
}
extern bool persistent_clock_exist;
#ifdef ALWAYS_USE_PERSISTENT_CLOCK
#define has_persistent_clock() true
#else
static inline bool has_persistent_clock(void)
{
return persistent_clock_exist;
}
#endif
extern void read_persistent_clock(struct timespec *ts);
extern void read_boot_clock(struct timespec *ts);
extern int update_persistent_clock(struct timespec now);
@ -158,6 +169,7 @@ extern int do_setitimer(int which, struct itimerval *value,
struct itimerval *ovalue);
extern unsigned int alarm_setitimer(unsigned int seconds);
extern int do_getitimer(int which, struct itimerval *value);
extern int __getnstimeofday(struct timespec *tv);
extern void getnstimeofday(struct timespec *tv);
extern void getrawmonotonic(struct timespec *ts);
extern void getnstime_raw_and_real(struct timespec *ts_raw,

2
kernel/posix-timers.c
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@ -997,7 +997,7 @@ SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock,
err = kc->clock_adj(which_clock, &ktx);
if (!err && copy_to_user(utx, &ktx, sizeof(ktx)))
if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx)))
return -EFAULT;
return err;

5
kernel/time/Kconfig
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@ -12,6 +12,11 @@ config CLOCKSOURCE_WATCHDOG
config ARCH_CLOCKSOURCE_DATA
bool
# Platforms has a persistent clock
config ALWAYS_USE_PERSISTENT_CLOCK
bool
default n
# Timekeeping vsyscall support
config GENERIC_TIME_VSYSCALL
bool

16
kernel/time/ntp.c
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@ -15,6 +15,7 @@
#include <linux/time.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/rtc.h>
#include "tick-internal.h"
@ -483,8 +484,7 @@ out:
return leap;
}
#ifdef CONFIG_GENERIC_CMOS_UPDATE
#if defined(CONFIG_GENERIC_CMOS_UPDATE) || defined(CONFIG_RTC_SYSTOHC)
static void sync_cmos_clock(struct work_struct *work);
static DECLARE_DELAYED_WORK(sync_cmos_work, sync_cmos_clock);
@ -510,14 +510,22 @@ static void sync_cmos_clock(struct work_struct *work)
}
getnstimeofday(&now);
if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2)
if (abs(now.tv_nsec - (NSEC_PER_SEC / 2)) <= tick_nsec / 2) {
fail = -ENODEV;
#ifdef CONFIG_GENERIC_CMOS_UPDATE
fail = update_persistent_clock(now);
#endif
#ifdef CONFIG_RTC_SYSTOHC
if (fail == -ENODEV)
fail = rtc_set_ntp_time(now);
#endif
}
next.tv_nsec = (NSEC_PER_SEC / 2) - now.tv_nsec - (TICK_NSEC / 2);
if (next.tv_nsec <= 0)
next.tv_nsec += NSEC_PER_SEC;
if (!fail)
if (!fail || fail == -ENODEV)
next.tv_sec = 659;
else
next.tv_sec = 0;

45
kernel/time/timekeeping.c
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@ -29,6 +29,9 @@ static struct timekeeper timekeeper;
/* flag for if timekeeping is suspended */
int __read_mostly timekeeping_suspended;
/* Flag for if there is a persistent clock on this platform */
bool __read_mostly persistent_clock_exist = false;
static inline void tk_normalize_xtime(struct timekeeper *tk)
{
while (tk->xtime_nsec >= ((u64)NSEC_PER_SEC << tk->shift)) {
@ -264,19 +267,18 @@ static void timekeeping_forward_now(struct timekeeper *tk)
}
/**
* getnstimeofday - Returns the time of day in a timespec
* __getnstimeofday - Returns the time of day in a timespec.
* @ts: pointer to the timespec to be set
*
* Returns the time of day in a timespec.
* Updates the time of day in the timespec.
* Returns 0 on success, or -ve when suspended (timespec will be undefined).
*/
void getnstimeofday(struct timespec *ts)
int __getnstimeofday(struct timespec *ts)
{
struct timekeeper *tk = &timekeeper;
unsigned long seq;
s64 nsecs = 0;
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&tk->lock);
@ -287,6 +289,26 @@ void getnstimeofday(struct timespec *ts)
ts->tv_nsec = 0;
timespec_add_ns(ts, nsecs);
/*
* Do not bail out early, in case there were callers still using
* the value, even in the face of the WARN_ON.
*/
if (unlikely(timekeeping_suspended))
return -EAGAIN;
return 0;
}
EXPORT_SYMBOL(__getnstimeofday);
/**
* getnstimeofday - Returns the time of day in a timespec.
* @ts: pointer to the timespec to be set
*
* Returns the time of day in a timespec (WARN if suspended).
*/
void getnstimeofday(struct timespec *ts)
{
WARN_ON(__getnstimeofday(ts));
}
EXPORT_SYMBOL(getnstimeofday);
@ -640,12 +662,14 @@ void __init timekeeping_init(void)
struct timespec now, boot, tmp;
read_persistent_clock(&now);
if (!timespec_valid_strict(&now)) {
pr_warn("WARNING: Persistent clock returned invalid value!\n"
" Check your CMOS/BIOS settings.\n");
now.tv_sec = 0;
now.tv_nsec = 0;
}
} else if (now.tv_sec || now.tv_nsec)
persistent_clock_exist = true;
read_boot_clock(&boot);
if (!timespec_valid_strict(&boot)) {
@ -718,11 +742,12 @@ void timekeeping_inject_sleeptime(struct timespec *delta)
{
struct timekeeper *tk = &timekeeper;
unsigned long flags;
struct timespec ts;
/* Make sure we don't set the clock twice */
read_persistent_clock(&ts);
if (!(ts.tv_sec == 0 && ts.tv_nsec == 0))
/*
* Make sure we don't set the clock twice, as timekeeping_resume()
* already did it
*/
if (has_persistent_clock())
return;
write_seqlock_irqsave(&tk->lock, flags);