From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946434AbbHGXAs (ORCPT ); Fri, 7 Aug 2015 19:00:48 -0400 Received: from mga01.intel.com ([192.55.52.88]:43700 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946349AbbHGXAr (ORCPT ); Fri, 7 Aug 2015 19:00:47 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,631,1432623600"; d="scan'208";a="744431398" From: Christopher Hall To: john.stultz@linaro.org, tglx@linutronix.de, richardcochran@gmail.com, mingo@redhat.com, jeffrey.t.kirsher@intel.com, john.ronciak@intel.com, hpa@zytor.com, x86@kernel.org Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, Christopher Hall Subject: [PATCH v2 0/4] Patchset enabling hardware based cross-timestamps for next gen Intel platforms Date: Fri, 7 Aug 2015 16:01:31 -0700 Message-Id: <1438988495-9942-1-git-send-email-christopher.s.hall@intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 6th generation Intel platforms will have an Always Running Timer (ART) that always runs when the system is powered and is available to both the CPU and various on-board devices. Initially, those devices include audio and network. The ART will give these devices the capability of precisely cross timestamping their local device clock with the system clock. A system clock value like TSC or ART is not useful unless translated to system time. The first *two* patches enable this by changing the timekeeping code to return a system time given a system clock value and translating ART to TSC. The last two patches modify the PTP driver to call a cross timestamp function in the driver when available and perform the cross timestamp in the e1000e driver. Given the precise relationship between the network device clock and system time enables better synchronization of events on multiple network connected devices. Changelog: * The PTP portion of the patch set was posted 7/8/2015 (v3) and rejected because of there wasn't a driver that implemented the new API. Now, the driver patch is added and the PTP patch operation is modified to revert to previous behavior when cross timestamp can't be completed. This is indicated by the driver returning a non-zero value. * v2 re-submit based on tglx provided correlated clocksource patch. This has been included verbatim as the first patch in the series. Additions and modifications are in the second patch. The PTP driver patch is unchanged and the e1000e driver patch uses the *new* correlated clocksource interface but is otherwise (in terms of hardware and PTP driver) unchanged. * ART is removed as a compile option * ART is added as an X86_FEATURE Christopher Hall (4): Add generic correlated clocksource code and ART to TSC conversion code Add ART initialization code Add support for driver cross-timestamp to PTP_SYS_OFFSET ioctl Added getsynctime64() callback Documentation/ptp/testptp.c | 6 +- arch/x86/include/asm/cpufeature.h | 3 +- arch/x86/include/asm/tsc.h | 1 + arch/x86/kernel/tsc.c | 45 +++++++++++++++ drivers/net/ethernet/intel/e1000e/defines.h | 7 +++ drivers/net/ethernet/intel/e1000e/ptp.c | 88 +++++++++++++++++++++++++++++ drivers/net/ethernet/intel/e1000e/regs.h | 4 ++ drivers/ptp/ptp_chardev.c | 29 +++++++--- include/linux/clocksource.h | 32 +++++++++++ include/linux/ptp_clock_kernel.h | 7 +++ include/linux/timekeeping.h | 4 ++ include/uapi/linux/ptp_clock.h | 4 +- kernel/time/timekeeping.c | 64 +++++++++++++++++++++ 13 files changed, 282 insertions(+), 12 deletions(-) -- 1.9.1