[PATCH v4 0/4] Patchset enabling hardware based cross-timestamps for next gen Intel platforms

Christopher S. Hall
2015-10-13T01:47:56Z

Modern Intel hardware adds an Always Running Timer (ART) that allows the
network and audio device clocks to precisely cross timestamp the device
clock with the system clock. This allows a precise correlation of the
device time and system time.

v4 adds a history which enables the audio DSP (a "slow" device) to perform
cross-timestamping.

Christopher S. Hall (4):
Produce system time from correlated clocksource
Always running timer correlated clocksource
Add PTP_SYS_OFFSET_PRECISE for driver crosstimestamping
Adds hardware supported cross timestamp

Documentation/ptp/testptp.c | 6 +-
arch/x86/include/asm/cpufeature.h | 2 +-
arch/x86/include/asm/tsc.h | 2 +
arch/x86/kernel/tsc.c | 48 ++++++-
drivers/net/ethernet/intel/e1000e/defines.h | 5 +
drivers/net/ethernet/intel/e1000e/ptp.c | 77 +++++++++++
drivers/net/ethernet/intel/e1000e/regs.h | 4 +
drivers/ptp/ptp_chardev.c | 26 ++++
include/linux/clocksource.h | 33 +++++
include/linux/ptp_clock_kernel.h | 6 +
include/linux/timekeeping.h | 4 +
include/uapi/linux/ptp_clock.h | 12 +-
kernel/time/timekeeping.c | 203 +++++++++++++++++++++++++++-
13 files changed, 418 insertions(+), 10 deletions(-)

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2.1.4