809 lines
20 KiB
C
809 lines
20 KiB
C
/*
|
|
* Time of day based timer functions.
|
|
*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999, 2008
|
|
* Author(s): Hartmut Penner (hp@de.ibm.com),
|
|
* Martin Schwidefsky (schwidefsky@de.ibm.com),
|
|
* Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
|
|
*
|
|
* Derived from "arch/i386/kernel/time.c"
|
|
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "time"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/stop_machine.h>
|
|
#include <linux/time.h>
|
|
#include <linux/device.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/types.h>
|
|
#include <linux/profile.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/timekeeper_internal.h>
|
|
#include <linux/clockchips.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/kprobes.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/facility.h>
|
|
#include <asm/delay.h>
|
|
#include <asm/div64.h>
|
|
#include <asm/vdso.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/irq_regs.h>
|
|
#include <asm/vtimer.h>
|
|
#include <asm/stp.h>
|
|
#include <asm/cio.h>
|
|
#include "entry.h"
|
|
|
|
u64 sched_clock_base_cc = -1; /* Force to data section. */
|
|
EXPORT_SYMBOL_GPL(sched_clock_base_cc);
|
|
|
|
static DEFINE_PER_CPU(struct clock_event_device, comparators);
|
|
|
|
ATOMIC_NOTIFIER_HEAD(s390_epoch_delta_notifier);
|
|
EXPORT_SYMBOL(s390_epoch_delta_notifier);
|
|
|
|
unsigned char ptff_function_mask[16];
|
|
unsigned long lpar_offset;
|
|
unsigned long initial_leap_seconds;
|
|
|
|
/*
|
|
* Get time offsets with PTFF
|
|
*/
|
|
void __init ptff_init(void)
|
|
{
|
|
struct ptff_qto qto;
|
|
struct ptff_qui qui;
|
|
|
|
if (!test_facility(28))
|
|
return;
|
|
ptff(&ptff_function_mask, sizeof(ptff_function_mask), PTFF_QAF);
|
|
|
|
/* get LPAR offset */
|
|
if (ptff_query(PTFF_QTO) && ptff(&qto, sizeof(qto), PTFF_QTO) == 0)
|
|
lpar_offset = qto.tod_epoch_difference;
|
|
|
|
/* get initial leap seconds */
|
|
if (ptff_query(PTFF_QUI) && ptff(&qui, sizeof(qui), PTFF_QUI) == 0)
|
|
initial_leap_seconds = (unsigned long)
|
|
((long) qui.old_leap * 4096000000L);
|
|
}
|
|
|
|
/*
|
|
* Scheduler clock - returns current time in nanosec units.
|
|
*/
|
|
unsigned long long notrace sched_clock(void)
|
|
{
|
|
return tod_to_ns(get_tod_clock_monotonic());
|
|
}
|
|
NOKPROBE_SYMBOL(sched_clock);
|
|
|
|
/*
|
|
* Monotonic_clock - returns # of nanoseconds passed since time_init()
|
|
*/
|
|
unsigned long long monotonic_clock(void)
|
|
{
|
|
return sched_clock();
|
|
}
|
|
EXPORT_SYMBOL(monotonic_clock);
|
|
|
|
void tod_to_timeval(__u64 todval, struct timespec64 *xt)
|
|
{
|
|
unsigned long long sec;
|
|
|
|
sec = todval >> 12;
|
|
do_div(sec, 1000000);
|
|
xt->tv_sec = sec;
|
|
todval -= (sec * 1000000) << 12;
|
|
xt->tv_nsec = ((todval * 1000) >> 12);
|
|
}
|
|
EXPORT_SYMBOL(tod_to_timeval);
|
|
|
|
void clock_comparator_work(void)
|
|
{
|
|
struct clock_event_device *cd;
|
|
|
|
S390_lowcore.clock_comparator = -1ULL;
|
|
cd = this_cpu_ptr(&comparators);
|
|
cd->event_handler(cd);
|
|
}
|
|
|
|
/*
|
|
* Fixup the clock comparator.
|
|
*/
|
|
static void fixup_clock_comparator(unsigned long long delta)
|
|
{
|
|
/* If nobody is waiting there's nothing to fix. */
|
|
if (S390_lowcore.clock_comparator == -1ULL)
|
|
return;
|
|
S390_lowcore.clock_comparator += delta;
|
|
set_clock_comparator(S390_lowcore.clock_comparator);
|
|
}
|
|
|
|
static int s390_next_event(unsigned long delta,
|
|
struct clock_event_device *evt)
|
|
{
|
|
S390_lowcore.clock_comparator = get_tod_clock() + delta;
|
|
set_clock_comparator(S390_lowcore.clock_comparator);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set up lowcore and control register of the current cpu to
|
|
* enable TOD clock and clock comparator interrupts.
|
|
*/
|
|
void init_cpu_timer(void)
|
|
{
|
|
struct clock_event_device *cd;
|
|
int cpu;
|
|
|
|
S390_lowcore.clock_comparator = -1ULL;
|
|
set_clock_comparator(S390_lowcore.clock_comparator);
|
|
|
|
cpu = smp_processor_id();
|
|
cd = &per_cpu(comparators, cpu);
|
|
cd->name = "comparator";
|
|
cd->features = CLOCK_EVT_FEAT_ONESHOT;
|
|
cd->mult = 16777;
|
|
cd->shift = 12;
|
|
cd->min_delta_ns = 1;
|
|
cd->max_delta_ns = LONG_MAX;
|
|
cd->rating = 400;
|
|
cd->cpumask = cpumask_of(cpu);
|
|
cd->set_next_event = s390_next_event;
|
|
|
|
clockevents_register_device(cd);
|
|
|
|
/* Enable clock comparator timer interrupt. */
|
|
__ctl_set_bit(0,11);
|
|
|
|
/* Always allow the timing alert external interrupt. */
|
|
__ctl_set_bit(0, 4);
|
|
}
|
|
|
|
static void clock_comparator_interrupt(struct ext_code ext_code,
|
|
unsigned int param32,
|
|
unsigned long param64)
|
|
{
|
|
inc_irq_stat(IRQEXT_CLK);
|
|
if (S390_lowcore.clock_comparator == -1ULL)
|
|
set_clock_comparator(S390_lowcore.clock_comparator);
|
|
}
|
|
|
|
static void stp_timing_alert(struct stp_irq_parm *);
|
|
|
|
static void timing_alert_interrupt(struct ext_code ext_code,
|
|
unsigned int param32, unsigned long param64)
|
|
{
|
|
inc_irq_stat(IRQEXT_TLA);
|
|
if (param32 & 0x00038000)
|
|
stp_timing_alert((struct stp_irq_parm *) ¶m32);
|
|
}
|
|
|
|
static void stp_reset(void);
|
|
|
|
void read_persistent_clock64(struct timespec64 *ts)
|
|
{
|
|
__u64 clock;
|
|
|
|
clock = get_tod_clock() - initial_leap_seconds;
|
|
tod_to_timeval(clock - TOD_UNIX_EPOCH, ts);
|
|
}
|
|
|
|
void read_boot_clock64(struct timespec64 *ts)
|
|
{
|
|
__u64 clock;
|
|
|
|
clock = sched_clock_base_cc - initial_leap_seconds;
|
|
tod_to_timeval(clock - TOD_UNIX_EPOCH, ts);
|
|
}
|
|
|
|
static cycle_t read_tod_clock(struct clocksource *cs)
|
|
{
|
|
return get_tod_clock();
|
|
}
|
|
|
|
static struct clocksource clocksource_tod = {
|
|
.name = "tod",
|
|
.rating = 400,
|
|
.read = read_tod_clock,
|
|
.mask = -1ULL,
|
|
.mult = 1000,
|
|
.shift = 12,
|
|
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
|
|
};
|
|
|
|
struct clocksource * __init clocksource_default_clock(void)
|
|
{
|
|
return &clocksource_tod;
|
|
}
|
|
|
|
void update_vsyscall(struct timekeeper *tk)
|
|
{
|
|
u64 nsecps;
|
|
|
|
if (tk->tkr_mono.clock != &clocksource_tod)
|
|
return;
|
|
|
|
/* Make userspace gettimeofday spin until we're done. */
|
|
++vdso_data->tb_update_count;
|
|
smp_wmb();
|
|
vdso_data->xtime_tod_stamp = tk->tkr_mono.cycle_last;
|
|
vdso_data->xtime_clock_sec = tk->xtime_sec;
|
|
vdso_data->xtime_clock_nsec = tk->tkr_mono.xtime_nsec;
|
|
vdso_data->wtom_clock_sec =
|
|
tk->xtime_sec + tk->wall_to_monotonic.tv_sec;
|
|
vdso_data->wtom_clock_nsec = tk->tkr_mono.xtime_nsec +
|
|
+ ((u64) tk->wall_to_monotonic.tv_nsec << tk->tkr_mono.shift);
|
|
nsecps = (u64) NSEC_PER_SEC << tk->tkr_mono.shift;
|
|
while (vdso_data->wtom_clock_nsec >= nsecps) {
|
|
vdso_data->wtom_clock_nsec -= nsecps;
|
|
vdso_data->wtom_clock_sec++;
|
|
}
|
|
|
|
vdso_data->xtime_coarse_sec = tk->xtime_sec;
|
|
vdso_data->xtime_coarse_nsec =
|
|
(long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
|
|
vdso_data->wtom_coarse_sec =
|
|
vdso_data->xtime_coarse_sec + tk->wall_to_monotonic.tv_sec;
|
|
vdso_data->wtom_coarse_nsec =
|
|
vdso_data->xtime_coarse_nsec + tk->wall_to_monotonic.tv_nsec;
|
|
while (vdso_data->wtom_coarse_nsec >= NSEC_PER_SEC) {
|
|
vdso_data->wtom_coarse_nsec -= NSEC_PER_SEC;
|
|
vdso_data->wtom_coarse_sec++;
|
|
}
|
|
|
|
vdso_data->tk_mult = tk->tkr_mono.mult;
|
|
vdso_data->tk_shift = tk->tkr_mono.shift;
|
|
smp_wmb();
|
|
++vdso_data->tb_update_count;
|
|
}
|
|
|
|
extern struct timezone sys_tz;
|
|
|
|
void update_vsyscall_tz(void)
|
|
{
|
|
vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
|
|
vdso_data->tz_dsttime = sys_tz.tz_dsttime;
|
|
}
|
|
|
|
/*
|
|
* Initialize the TOD clock and the CPU timer of
|
|
* the boot cpu.
|
|
*/
|
|
void __init time_init(void)
|
|
{
|
|
/* Reset time synchronization interfaces. */
|
|
stp_reset();
|
|
|
|
/* request the clock comparator external interrupt */
|
|
if (register_external_irq(EXT_IRQ_CLK_COMP, clock_comparator_interrupt))
|
|
panic("Couldn't request external interrupt 0x1004");
|
|
|
|
/* request the timing alert external interrupt */
|
|
if (register_external_irq(EXT_IRQ_TIMING_ALERT, timing_alert_interrupt))
|
|
panic("Couldn't request external interrupt 0x1406");
|
|
|
|
if (__clocksource_register(&clocksource_tod) != 0)
|
|
panic("Could not register TOD clock source");
|
|
|
|
/* Enable TOD clock interrupts on the boot cpu. */
|
|
init_cpu_timer();
|
|
|
|
/* Enable cpu timer interrupts on the boot cpu. */
|
|
vtime_init();
|
|
}
|
|
|
|
static DEFINE_PER_CPU(atomic_t, clock_sync_word);
|
|
static DEFINE_MUTEX(clock_sync_mutex);
|
|
static unsigned long clock_sync_flags;
|
|
|
|
#define CLOCK_SYNC_HAS_STP 0
|
|
#define CLOCK_SYNC_STP 1
|
|
|
|
/*
|
|
* The get_clock function for the physical clock. It will get the current
|
|
* TOD clock, subtract the LPAR offset and write the result to *clock.
|
|
* The function returns 0 if the clock is in sync with the external time
|
|
* source. If the clock mode is local it will return -EOPNOTSUPP and
|
|
* -EAGAIN if the clock is not in sync with the external reference.
|
|
*/
|
|
int get_phys_clock(unsigned long long *clock)
|
|
{
|
|
atomic_t *sw_ptr;
|
|
unsigned int sw0, sw1;
|
|
|
|
sw_ptr = &get_cpu_var(clock_sync_word);
|
|
sw0 = atomic_read(sw_ptr);
|
|
*clock = get_tod_clock() - lpar_offset;
|
|
sw1 = atomic_read(sw_ptr);
|
|
put_cpu_var(clock_sync_word);
|
|
if (sw0 == sw1 && (sw0 & 0x80000000U))
|
|
/* Success: time is in sync. */
|
|
return 0;
|
|
if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
|
|
return -EOPNOTSUPP;
|
|
if (!test_bit(CLOCK_SYNC_STP, &clock_sync_flags))
|
|
return -EACCES;
|
|
return -EAGAIN;
|
|
}
|
|
EXPORT_SYMBOL(get_phys_clock);
|
|
|
|
/*
|
|
* Make get_phys_clock() return -EAGAIN.
|
|
*/
|
|
static void disable_sync_clock(void *dummy)
|
|
{
|
|
atomic_t *sw_ptr = this_cpu_ptr(&clock_sync_word);
|
|
/*
|
|
* Clear the in-sync bit 2^31. All get_phys_clock calls will
|
|
* fail until the sync bit is turned back on. In addition
|
|
* increase the "sequence" counter to avoid the race of an
|
|
* stp event and the complete recovery against get_phys_clock.
|
|
*/
|
|
atomic_andnot(0x80000000, sw_ptr);
|
|
atomic_inc(sw_ptr);
|
|
}
|
|
|
|
/*
|
|
* Make get_phys_clock() return 0 again.
|
|
* Needs to be called from a context disabled for preemption.
|
|
*/
|
|
static void enable_sync_clock(void)
|
|
{
|
|
atomic_t *sw_ptr = this_cpu_ptr(&clock_sync_word);
|
|
atomic_or(0x80000000, sw_ptr);
|
|
}
|
|
|
|
/*
|
|
* Function to check if the clock is in sync.
|
|
*/
|
|
static inline int check_sync_clock(void)
|
|
{
|
|
atomic_t *sw_ptr;
|
|
int rc;
|
|
|
|
sw_ptr = &get_cpu_var(clock_sync_word);
|
|
rc = (atomic_read(sw_ptr) & 0x80000000U) != 0;
|
|
put_cpu_var(clock_sync_word);
|
|
return rc;
|
|
}
|
|
|
|
/* Single threaded workqueue used for stp sync events */
|
|
static struct workqueue_struct *time_sync_wq;
|
|
|
|
static void __init time_init_wq(void)
|
|
{
|
|
if (time_sync_wq)
|
|
return;
|
|
time_sync_wq = create_singlethread_workqueue("timesync");
|
|
}
|
|
|
|
struct clock_sync_data {
|
|
atomic_t cpus;
|
|
int in_sync;
|
|
unsigned long long fixup_cc;
|
|
};
|
|
|
|
static void clock_sync_cpu(struct clock_sync_data *sync)
|
|
{
|
|
atomic_dec(&sync->cpus);
|
|
enable_sync_clock();
|
|
while (sync->in_sync == 0) {
|
|
__udelay(1);
|
|
/*
|
|
* A different cpu changes *in_sync. Therefore use
|
|
* barrier() to force memory access.
|
|
*/
|
|
barrier();
|
|
}
|
|
if (sync->in_sync != 1)
|
|
/* Didn't work. Clear per-cpu in sync bit again. */
|
|
disable_sync_clock(NULL);
|
|
/*
|
|
* This round of TOD syncing is done. Set the clock comparator
|
|
* to the next tick and let the processor continue.
|
|
*/
|
|
fixup_clock_comparator(sync->fixup_cc);
|
|
}
|
|
|
|
/*
|
|
* Server Time Protocol (STP) code.
|
|
*/
|
|
static bool stp_online;
|
|
static struct stp_sstpi stp_info;
|
|
static void *stp_page;
|
|
|
|
static void stp_work_fn(struct work_struct *work);
|
|
static DEFINE_MUTEX(stp_work_mutex);
|
|
static DECLARE_WORK(stp_work, stp_work_fn);
|
|
static struct timer_list stp_timer;
|
|
|
|
static int __init early_parse_stp(char *p)
|
|
{
|
|
return kstrtobool(p, &stp_online);
|
|
}
|
|
early_param("stp", early_parse_stp);
|
|
|
|
/*
|
|
* Reset STP attachment.
|
|
*/
|
|
static void __init stp_reset(void)
|
|
{
|
|
int rc;
|
|
|
|
stp_page = (void *) get_zeroed_page(GFP_ATOMIC);
|
|
rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000, NULL);
|
|
if (rc == 0)
|
|
set_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags);
|
|
else if (stp_online) {
|
|
pr_warn("The real or virtual hardware system does not provide an STP interface\n");
|
|
free_page((unsigned long) stp_page);
|
|
stp_page = NULL;
|
|
stp_online = 0;
|
|
}
|
|
}
|
|
|
|
static void stp_timeout(unsigned long dummy)
|
|
{
|
|
queue_work(time_sync_wq, &stp_work);
|
|
}
|
|
|
|
static int __init stp_init(void)
|
|
{
|
|
if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
|
|
return 0;
|
|
setup_timer(&stp_timer, stp_timeout, 0UL);
|
|
time_init_wq();
|
|
if (!stp_online)
|
|
return 0;
|
|
queue_work(time_sync_wq, &stp_work);
|
|
return 0;
|
|
}
|
|
|
|
arch_initcall(stp_init);
|
|
|
|
/*
|
|
* STP timing alert. There are three causes:
|
|
* 1) timing status change
|
|
* 2) link availability change
|
|
* 3) time control parameter change
|
|
* In all three cases we are only interested in the clock source state.
|
|
* If a STP clock source is now available use it.
|
|
*/
|
|
static void stp_timing_alert(struct stp_irq_parm *intparm)
|
|
{
|
|
if (intparm->tsc || intparm->lac || intparm->tcpc)
|
|
queue_work(time_sync_wq, &stp_work);
|
|
}
|
|
|
|
/*
|
|
* STP sync check machine check. This is called when the timing state
|
|
* changes from the synchronized state to the unsynchronized state.
|
|
* After a STP sync check the clock is not in sync. The machine check
|
|
* is broadcasted to all cpus at the same time.
|
|
*/
|
|
int stp_sync_check(void)
|
|
{
|
|
disable_sync_clock(NULL);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* STP island condition machine check. This is called when an attached
|
|
* server attempts to communicate over an STP link and the servers
|
|
* have matching CTN ids and have a valid stratum-1 configuration
|
|
* but the configurations do not match.
|
|
*/
|
|
int stp_island_check(void)
|
|
{
|
|
disable_sync_clock(NULL);
|
|
return 1;
|
|
}
|
|
|
|
void stp_queue_work(void)
|
|
{
|
|
queue_work(time_sync_wq, &stp_work);
|
|
}
|
|
|
|
static int stp_sync_clock(void *data)
|
|
{
|
|
static int first;
|
|
unsigned long long clock_delta;
|
|
struct clock_sync_data *stp_sync;
|
|
struct ptff_qto qto;
|
|
int rc;
|
|
|
|
stp_sync = data;
|
|
|
|
if (xchg(&first, 1) == 1) {
|
|
/* Slave */
|
|
clock_sync_cpu(stp_sync);
|
|
return 0;
|
|
}
|
|
|
|
/* Wait until all other cpus entered the sync function. */
|
|
while (atomic_read(&stp_sync->cpus) != 0)
|
|
cpu_relax();
|
|
|
|
enable_sync_clock();
|
|
|
|
rc = 0;
|
|
if (stp_info.todoff[0] || stp_info.todoff[1] ||
|
|
stp_info.todoff[2] || stp_info.todoff[3] ||
|
|
stp_info.tmd != 2) {
|
|
rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0, &clock_delta);
|
|
if (rc == 0) {
|
|
/* fixup the monotonic sched clock */
|
|
sched_clock_base_cc += clock_delta;
|
|
if (ptff_query(PTFF_QTO) &&
|
|
ptff(&qto, sizeof(qto), PTFF_QTO) == 0)
|
|
/* Update LPAR offset */
|
|
lpar_offset = qto.tod_epoch_difference;
|
|
atomic_notifier_call_chain(&s390_epoch_delta_notifier,
|
|
0, &clock_delta);
|
|
stp_sync->fixup_cc = clock_delta;
|
|
fixup_clock_comparator(clock_delta);
|
|
rc = chsc_sstpi(stp_page, &stp_info,
|
|
sizeof(struct stp_sstpi));
|
|
if (rc == 0 && stp_info.tmd != 2)
|
|
rc = -EAGAIN;
|
|
}
|
|
}
|
|
if (rc) {
|
|
disable_sync_clock(NULL);
|
|
stp_sync->in_sync = -EAGAIN;
|
|
} else
|
|
stp_sync->in_sync = 1;
|
|
xchg(&first, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* STP work. Check for the STP state and take over the clock
|
|
* synchronization if the STP clock source is usable.
|
|
*/
|
|
static void stp_work_fn(struct work_struct *work)
|
|
{
|
|
struct clock_sync_data stp_sync;
|
|
int rc;
|
|
|
|
/* prevent multiple execution. */
|
|
mutex_lock(&stp_work_mutex);
|
|
|
|
if (!stp_online) {
|
|
chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000, NULL);
|
|
del_timer_sync(&stp_timer);
|
|
goto out_unlock;
|
|
}
|
|
|
|
rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0, NULL);
|
|
if (rc)
|
|
goto out_unlock;
|
|
|
|
rc = chsc_sstpi(stp_page, &stp_info, sizeof(struct stp_sstpi));
|
|
if (rc || stp_info.c == 0)
|
|
goto out_unlock;
|
|
|
|
/* Skip synchronization if the clock is already in sync. */
|
|
if (check_sync_clock())
|
|
goto out_unlock;
|
|
|
|
memset(&stp_sync, 0, sizeof(stp_sync));
|
|
get_online_cpus();
|
|
atomic_set(&stp_sync.cpus, num_online_cpus() - 1);
|
|
stop_machine(stp_sync_clock, &stp_sync, cpu_online_mask);
|
|
put_online_cpus();
|
|
|
|
if (!check_sync_clock())
|
|
/*
|
|
* There is a usable clock but the synchonization failed.
|
|
* Retry after a second.
|
|
*/
|
|
mod_timer(&stp_timer, jiffies + HZ);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&stp_work_mutex);
|
|
}
|
|
|
|
/*
|
|
* STP subsys sysfs interface functions
|
|
*/
|
|
static struct bus_type stp_subsys = {
|
|
.name = "stp",
|
|
.dev_name = "stp",
|
|
};
|
|
|
|
static ssize_t stp_ctn_id_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online)
|
|
return -ENODATA;
|
|
return sprintf(buf, "%016llx\n",
|
|
*(unsigned long long *) stp_info.ctnid);
|
|
}
|
|
|
|
static DEVICE_ATTR(ctn_id, 0400, stp_ctn_id_show, NULL);
|
|
|
|
static ssize_t stp_ctn_type_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online)
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", stp_info.ctn);
|
|
}
|
|
|
|
static DEVICE_ATTR(ctn_type, 0400, stp_ctn_type_show, NULL);
|
|
|
|
static ssize_t stp_dst_offset_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online || !(stp_info.vbits & 0x2000))
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", (int)(s16) stp_info.dsto);
|
|
}
|
|
|
|
static DEVICE_ATTR(dst_offset, 0400, stp_dst_offset_show, NULL);
|
|
|
|
static ssize_t stp_leap_seconds_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online || !(stp_info.vbits & 0x8000))
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", (int)(s16) stp_info.leaps);
|
|
}
|
|
|
|
static DEVICE_ATTR(leap_seconds, 0400, stp_leap_seconds_show, NULL);
|
|
|
|
static ssize_t stp_stratum_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online)
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", (int)(s16) stp_info.stratum);
|
|
}
|
|
|
|
static DEVICE_ATTR(stratum, 0400, stp_stratum_show, NULL);
|
|
|
|
static ssize_t stp_time_offset_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online || !(stp_info.vbits & 0x0800))
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", (int) stp_info.tto);
|
|
}
|
|
|
|
static DEVICE_ATTR(time_offset, 0400, stp_time_offset_show, NULL);
|
|
|
|
static ssize_t stp_time_zone_offset_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online || !(stp_info.vbits & 0x4000))
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", (int)(s16) stp_info.tzo);
|
|
}
|
|
|
|
static DEVICE_ATTR(time_zone_offset, 0400,
|
|
stp_time_zone_offset_show, NULL);
|
|
|
|
static ssize_t stp_timing_mode_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online)
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", stp_info.tmd);
|
|
}
|
|
|
|
static DEVICE_ATTR(timing_mode, 0400, stp_timing_mode_show, NULL);
|
|
|
|
static ssize_t stp_timing_state_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
if (!stp_online)
|
|
return -ENODATA;
|
|
return sprintf(buf, "%i\n", stp_info.tst);
|
|
}
|
|
|
|
static DEVICE_ATTR(timing_state, 0400, stp_timing_state_show, NULL);
|
|
|
|
static ssize_t stp_online_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%i\n", stp_online);
|
|
}
|
|
|
|
static ssize_t stp_online_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int value;
|
|
|
|
value = simple_strtoul(buf, NULL, 0);
|
|
if (value != 0 && value != 1)
|
|
return -EINVAL;
|
|
if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
|
|
return -EOPNOTSUPP;
|
|
mutex_lock(&clock_sync_mutex);
|
|
stp_online = value;
|
|
if (stp_online)
|
|
set_bit(CLOCK_SYNC_STP, &clock_sync_flags);
|
|
else
|
|
clear_bit(CLOCK_SYNC_STP, &clock_sync_flags);
|
|
queue_work(time_sync_wq, &stp_work);
|
|
mutex_unlock(&clock_sync_mutex);
|
|
return count;
|
|
}
|
|
|
|
/*
|
|
* Can't use DEVICE_ATTR because the attribute should be named
|
|
* stp/online but dev_attr_online already exists in this file ..
|
|
*/
|
|
static struct device_attribute dev_attr_stp_online = {
|
|
.attr = { .name = "online", .mode = 0600 },
|
|
.show = stp_online_show,
|
|
.store = stp_online_store,
|
|
};
|
|
|
|
static struct device_attribute *stp_attributes[] = {
|
|
&dev_attr_ctn_id,
|
|
&dev_attr_ctn_type,
|
|
&dev_attr_dst_offset,
|
|
&dev_attr_leap_seconds,
|
|
&dev_attr_stp_online,
|
|
&dev_attr_stratum,
|
|
&dev_attr_time_offset,
|
|
&dev_attr_time_zone_offset,
|
|
&dev_attr_timing_mode,
|
|
&dev_attr_timing_state,
|
|
NULL
|
|
};
|
|
|
|
static int __init stp_init_sysfs(void)
|
|
{
|
|
struct device_attribute **attr;
|
|
int rc;
|
|
|
|
rc = subsys_system_register(&stp_subsys, NULL);
|
|
if (rc)
|
|
goto out;
|
|
for (attr = stp_attributes; *attr; attr++) {
|
|
rc = device_create_file(stp_subsys.dev_root, *attr);
|
|
if (rc)
|
|
goto out_unreg;
|
|
}
|
|
return 0;
|
|
out_unreg:
|
|
for (; attr >= stp_attributes; attr--)
|
|
device_remove_file(stp_subsys.dev_root, *attr);
|
|
bus_unregister(&stp_subsys);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
device_initcall(stp_init_sysfs);
|