diff options
| author | Sven Schnelle <svens@linux.ibm.com> | 2024-10-23 08:56:01 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-10-31 01:02:39 +0100 |
| commit | 2d7de7a3010d713fb89b7ba99e6fdc14475ad106 (patch) | |
| tree | ebc2fc75697fc77e455781534553d23ead90317d /arch/s390/include/asm/timex.h | |
| parent | s390/time: Add clocksource id to TOD clock (diff) | |
| download | linux-2d7de7a3010d713fb89b7ba99e6fdc14475ad106.tar.xz linux-2d7de7a3010d713fb89b7ba99e6fdc14475ad106.zip | |
s390/time: Add PtP driver
Add a small PtP driver which allows user space to get
the values of the physical and tod clock. This allows
programs like chrony to use STP as clock source and
steer the kernel clock. The physical clock can be used
as a debugging aid to get the clock without any additional
offsets like STP steering or LPAR offset.
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Link: https://patch.msgid.link/20241023065601.449586-3-svens@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'arch/s390/include/asm/timex.h')
| -rw-r--r-- | arch/s390/include/asm/timex.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h index 640901f2fbc3..642fd303ce01 100644 --- a/arch/s390/include/asm/timex.h +++ b/arch/s390/include/asm/timex.h @@ -93,6 +93,7 @@ extern unsigned char ptff_function_mask[16]; #define PTFF_QAF 0x00 /* query available functions */ #define PTFF_QTO 0x01 /* query tod offset */ #define PTFF_QSI 0x02 /* query steering information */ +#define PTFF_QPT 0x03 /* query physical clock */ #define PTFF_QUI 0x04 /* query UTC information */ #define PTFF_ATO 0x40 /* adjust tod offset */ #define PTFF_STO 0x41 /* set tod offset */ @@ -250,6 +251,11 @@ static __always_inline unsigned long tod_to_ns(unsigned long todval) return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9); } +static __always_inline u128 eitod_to_ns(u128 todval) +{ + return (todval * 125) >> 9; +} + /** * tod_after - compare two 64 bit TOD values * @a: first 64 bit TOD timestamp |