diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-05-31 09:09:57 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-06-13 15:58:19 +0200 |
| commit | 2f82f57763d97700788cf228de1cf30ffd4153b4 (patch) | |
| tree | 39cacadec4bc9203b539c60f815f4c2f77b92a1b /arch/s390 | |
| parent | 4e042af463f806b6ef0e44048eba0964f0a5694e (diff) | |
s390/time: STP sync clock correction
The sync clock operation of the channel subsystem call for STP delivers
the TOD clock difference as a result. Use this TOD clock difference
instead of the difference between the TOD timestamps before and after
the sync clock operation.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/cio.h | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/time.c | 11 |
2 files changed, 6 insertions, 7 deletions
diff --git a/arch/s390/include/asm/cio.h b/arch/s390/include/asm/cio.h index d1e7b0a0feeb..f7ed88cc066e 100644 --- a/arch/s390/include/asm/cio.h +++ b/arch/s390/include/asm/cio.h @@ -320,7 +320,7 @@ struct cio_iplinfo { extern int cio_get_iplinfo(struct cio_iplinfo *iplinfo); /* Function from drivers/s390/cio/chsc.c */ -int chsc_sstpc(void *page, unsigned int op, u16 ctrl); +int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta); int chsc_sstpi(void *page, void *result, size_t size); #endif diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c index 9409d32f285e..a725fd1c4315 100644 --- a/arch/s390/kernel/time.c +++ b/arch/s390/kernel/time.c @@ -1455,7 +1455,7 @@ 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); + 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) { @@ -1554,11 +1554,10 @@ static int stp_sync_clock(void *data) stp_info.todoff[2] || stp_info.todoff[3] || stp_info.tmd != 2) { old_clock = get_tod_clock(); - rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0); + rc = chsc_sstpc(stp_page, STP_OP_SYNC, 0, &clock_delta); if (rc == 0) { - new_clock = get_tod_clock(); + new_clock = old_clock + clock_delta; delta = adjust_time(old_clock, new_clock, 0); - clock_delta = new_clock - old_clock; atomic_notifier_call_chain(&s390_epoch_delta_notifier, 0, &clock_delta); fixup_clock_comparator(delta); @@ -1590,12 +1589,12 @@ static void stp_work_fn(struct work_struct *work) mutex_lock(&stp_work_mutex); if (!stp_online) { - chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000); + 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); + rc = chsc_sstpc(stp_page, STP_OP_CTRL, 0xb0e0, NULL); if (rc) goto out_unlock; |