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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2016-05-31 09:09:57 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-06-13 15:58:19 +0200
commit2f82f57763d97700788cf228de1cf30ffd4153b4 (patch)
tree39cacadec4bc9203b539c60f815f4c2f77b92a1b /drivers/s390/cio
parent4e042af463f806b6ef0e44048eba0964f0a5694e (diff)
downloadlinux-2f82f57763d97700788cf228de1cf30ffd4153b4.tar.bz2
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 'drivers/s390/cio')
-rw-r--r--drivers/s390/cio/chsc.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index c424c0c7367e..452193f7298c 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -1176,7 +1176,7 @@ exit:
EXPORT_SYMBOL_GPL(css_general_characteristics);
EXPORT_SYMBOL_GPL(css_chsc_characteristics);
-int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
+int chsc_sstpc(void *page, unsigned int op, u16 ctrl, u64 *clock_delta)
{
struct {
struct chsc_header request;
@@ -1186,7 +1186,9 @@ int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
unsigned int ctrl : 16;
unsigned int rsvd2[5];
struct chsc_header response;
- unsigned int rsvd3[7];
+ unsigned int rsvd3[3];
+ u64 clock_delta;
+ unsigned int rsvd4[2];
} __attribute__ ((packed)) *rr;
int rc;
@@ -1200,6 +1202,8 @@ int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
if (rc)
return -EIO;
rc = (rr->response.code == 0x0001) ? 0 : -EIO;
+ if (clock_delta)
+ *clock_delta = rr->clock_delta;
return rc;
}