From nobody Wed Apr 15 23:30:24 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2804C4332F for ; Tue, 22 Nov 2022 03:12:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232161AbiKVDMh (ORCPT ); Mon, 21 Nov 2022 22:12:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232145AbiKVDM3 (ORCPT ); Mon, 21 Nov 2022 22:12:29 -0500 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DC00EF for ; Mon, 21 Nov 2022 19:12:25 -0800 (PST) Received: by mail-pj1-x102a.google.com with SMTP id a22-20020a17090a6d9600b0021896eb5554so7087679pjk.1 for ; Mon, 21 Nov 2022 19:12:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to; bh=Se+rQxfB9azQ9LwMlvUhs4bHhUxdZadPH+3XYKTsOAQ=; b=MZeGSc0FKLQ3HCn/hIrNfCnEpiMBokfUim0z8MQww8kULmz5MP4LdyE9ZkN4nt3/se 4xGyq7jDYblF7PTGCxaBLWO4i+NODejcQXMZ3LxiPdSiAxOQO9X07iroMbfGQA+zpNh5 AS1jBFAmdAa43PgzTwaMxKSSbXAcCTb2OOHQg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=mime-version:message-id:date:subject:cc:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Se+rQxfB9azQ9LwMlvUhs4bHhUxdZadPH+3XYKTsOAQ=; b=fA8JqAsKz7Kkr62x5w+Kx83HwA4FB8cJ+WA3hGXSMH12ujqMHxKx3B/rDxE7bihetZ l3Yzt8WoDJrZrSrtkLR3NJEhMazXnA87Wks68UFt9SvBMn5P8XQ76Ra9afh73aE5dIy6 aHZ56RTvA7yrRhfKQp0pv1baVG1j94UEhvdVh1oJBS8DZwUsYthIjpQkXmA230RD/9G8 6asL9So+GkL7UtldA9kUg3jHkU1I7UyXbbD3BSZ7oV3mf59zqAQyq6XwsOg8kigee9cC Yl8PRslH5uY8KH+CtAOfmG68UJ9b5wvr8jTLFjtAkykJR5irl865iQqNTaH0hXoiWsuT K67A== X-Gm-Message-State: ANoB5pnBoYbw0bKcwih/AXdBwJGspd66XBS96BkWPXRclVqvcVT2/IRR SzJB5OVjFqRsJyOrPy3sgrPWAFzki783vnmkiMuPWCEOwNsexDxMrdao1fXj1WydgJSos+oUxk4 n+xPBMh52RkSCJtl5HMvAokcNQ7/ZR8CoNbXKIZhVYiKZXSVmSalnKM5CJnqywVNPFKjvmGTDZV VJWcvJMUiGgsccmSMKhA== X-Google-Smtp-Source: AA0mqf5NzITPYri3DKRA6Ary68SV8dYFlLh34PrIlaaAt1N4neIi25DOZxPwK+v8SaHz7Ggd38/DEg== X-Received: by 2002:a17:902:d502:b0:186:9ef1:647e with SMTP id b2-20020a170902d50200b001869ef1647emr1902637plg.143.1669086744234; Mon, 21 Nov 2022 19:12:24 -0800 (PST) Received: from ldt-sj3-komrakov.dhcp.broadcom.net ([192.19.222.250]) by smtp.gmail.com with ESMTPSA id x6-20020a170902a38600b00186881688f2sm10467059pla.220.2022.11.21.19.12.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Nov 2022 19:12:23 -0800 (PST) From: alexander komrakov To: linux-kernel@vger.kernel.org Cc: giometti@enneenne.com, alexander komrakov Subject: [PATCH] PPS elapsed real-time assert events/seq number Date: Mon, 21 Nov 2022 19:12:20 -0800 Message-Id: <20221122031220.2020054-1-alexander.komrakov@broadcom.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000086ad7905ee068a72" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --00000000000086ad7905ee068a72 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Calculate the monotonic clock from the timespec clock to generate PPS elaps= ed real-time event value and stores the result into /sys/class/pps/pps0/ass= ert_elapsed. Because we have requirements to make sure the delta between standard time, = say the GPS Time, and elapsedRealtime < 1 millisecond, regular linux clock = timestamp is not enough for our use case. The pin PPS will generate elapsedRealtime event at 1 sec boundary which is = an exact value of the monotonic clock from the kernel PPS driver (/sys/clas= s/pps/pps0/assert_elapsed). Whenever AP receives this pulse, kernel's pps driver timestamp this elapsed= Realtime event and let this time available via sysfs node (/sys/class/pps/p= ps0/assert_elapsed) or the IOCTL call. --- Documentation/ABI/testing/sysfs-pps | 24 ++++++++++++++++++ drivers/pps/kapi.c | 38 ++++++++++++++++++++++++++--- drivers/pps/sysfs.c | 33 +++++++++++++++++++++++++ include/linux/pps_kernel.h | 2 ++ 4 files changed, 94 insertions(+), 3 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-pps b/Documentation/ABI/testin= g/sysfs-pps index 25028c7bc37d..054617abeebd 100644 --- a/Documentation/ABI/testing/sysfs-pps +++ b/Documentation/ABI/testing/sysfs-pps @@ -1,3 +1,27 @@ +What: /sys/class/pps/pps0/assert_elapsed +Date: October 2021 +Contact: Alexander Komrakov +Description: + The /sys/class/pps/ppsX/assert_elapsed file reports the elapsed real-tim= e assert events + and the elapsed real-time assert sequence number of the X-th source in t= he form: + + .# + + If the source has no elapsed real-time assert events the content of this= file + is empty. + +What: /sys/class/pps/ppsX/clear_elapsed +Date: October 2021 +Contact: Alexander Komrakov +Description: + The /sys/class/pps/ppsX/clear_elapsed file reports the elapsed real-time= clear events + and the elapsed real-time clear sequence number of the X-th source in th= e form: + + .# + + If the source has no elapsed real-time clear events the content of this = file + is empty. + What: /sys/class/pps/ Date: February 2008 Contact: Rodolfo Giometti diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c index d9d566f70ed1..6d1fbe4a8c40 100644 --- a/drivers/pps/kapi.c +++ b/drivers/pps/kapi.c @@ -23,6 +23,26 @@ /* * Local functions */ + #define NANOSEC_PER_SEC 1000000000 /* 10^9 */ + +/** + * clock_gettime - get the monotonic clock in pps_ktime format + * @kt: pointer to the pps_ktime to be set to raw monotonic time + * + * The function calculates the monotonic clock from the timespec clock + * and stores the result in pps_ktime format in the variable pointed to by= @kt. + * + * The function returns the monotonic clock normalized format in nanosec. + */ +static __u64 clock_gettime(struct pps_ktime *kt) +{ + struct timespec64 ts =3D { .tv_sec =3D 0, .tv_nsec =3D 0 }; + + ktime_get_boottime_ts64(&ts); + kt->sec =3D ts.tv_sec; + kt->nsec =3D ts.tv_nsec; + return (__u64) ts.tv_sec * NANOSEC_PER_SEC + ts.tv_nsec; +} =20 static void pps_add_offset(struct pps_ktime *ts, struct pps_ktime *offset) { @@ -162,11 +182,15 @@ void pps_event(struct pps_device *pps, struct pps_eve= nt_time *ts, int event, unsigned long flags; int captured =3D 0; struct pps_ktime ts_real =3D { .sec =3D 0, .nsec =3D 0, .flags =3D 0 }; + struct pps_ktime ts_real_elapsed =3D { .sec =3D 0, .nsec =3D 0, .flags = =3D 0 }; =20 /* check event type */ BUG_ON((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) =3D=3D 0); + clock_gettime(&ts_real_elapsed); + dev_dbg(pps->dev, "PPS event (monotonic) at %lld.%09d\n", + (s64)ts_real_elapsed.sec, ts_real_elapsed.nsec); =20 - dev_dbg(pps->dev, "PPS event at %lld.%09ld\n", + dev_dbg(pps->dev, "PPS event (timestamp) at %lld.%09ld\n", (s64)ts->ts_real.tv_sec, ts->ts_real.tv_nsec); =20 timespec_to_pps_ktime(&ts_real, ts->ts_real); @@ -181,11 +205,15 @@ void pps_event(struct pps_device *pps, struct pps_eve= nt_time *ts, int event, pps->current_mode =3D pps->params.mode; if (event & pps->params.mode & PPS_CAPTUREASSERT) { /* We have to add an offset? */ - if (pps->params.mode & PPS_OFFSETASSERT) + if (pps->params.mode & PPS_OFFSETASSERT) { + pps_add_offset(&ts_real_elapsed, + &pps->params.assert_off_tu); pps_add_offset(&ts_real, &pps->params.assert_off_tu); + } =20 /* Save the time stamp */ + pps->assert_elapsed_tu =3D ts_real_elapsed; pps->assert_tu =3D ts_real; pps->assert_sequence++; dev_dbg(pps->dev, "capture assert seq #%u\n", @@ -195,11 +223,15 @@ void pps_event(struct pps_device *pps, struct pps_eve= nt_time *ts, int event, } if (event & pps->params.mode & PPS_CAPTURECLEAR) { /* We have to add an offset? */ - if (pps->params.mode & PPS_OFFSETCLEAR) + if (pps->params.mode & PPS_OFFSETCLEAR) { + pps_add_offset(&ts_real_elapsed, + &pps->params.clear_off_tu); pps_add_offset(&ts_real, &pps->params.clear_off_tu); + } =20 /* Save the time stamp */ + pps->clear_elapsed_tu =3D ts_real_elapsed; pps->clear_tu =3D ts_real; pps->clear_sequence++; dev_dbg(pps->dev, "capture clear seq #%u\n", diff --git a/drivers/pps/sysfs.c b/drivers/pps/sysfs.c index 134bc33f6ad0..97721cb01695 100644 --- a/drivers/pps/sysfs.c +++ b/drivers/pps/sysfs.c @@ -29,6 +29,21 @@ static ssize_t assert_show(struct device *dev, struct de= vice_attribute *attr, } static DEVICE_ATTR_RO(assert); =20 +static ssize_t assert_elapsed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pps_device *pps =3D dev_get_drvdata(dev); + + if (!(pps->info.mode & PPS_CAPTUREASSERT)) + return 0; + + return sprintf(buf, "%lld.%09d#%d\n", + (long long) pps->assert_elapsed_tu.sec, + pps->assert_elapsed_tu.nsec, + pps->assert_sequence); +} +static DEVICE_ATTR_RO(assert_elapsed); + static ssize_t clear_show(struct device *dev, struct device_attribute *att= r, char *buf) { @@ -43,6 +58,22 @@ static ssize_t clear_show(struct device *dev, struct dev= ice_attribute *attr, } static DEVICE_ATTR_RO(clear); =20 +static ssize_t clear_elapsed_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pps_device *pps =3D dev_get_drvdata(dev); + + if (!(pps->info.mode & PPS_CAPTURECLEAR)) + return 0; + + return sprintf(buf, "%lld.%09d#%d\n", + (long long) pps->clear_elapsed_tu.sec, + pps->clear_elapsed_tu.nsec, + pps->clear_sequence); +} +static DEVICE_ATTR_RO(clear_elapsed); + static ssize_t mode_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -81,7 +112,9 @@ static DEVICE_ATTR_RO(path); =20 static struct attribute *pps_attrs[] =3D { &dev_attr_assert.attr, + &dev_attr_assert_elapsed.attr, &dev_attr_clear.attr, + &dev_attr_clear_elapsed.attr, &dev_attr_mode.attr, &dev_attr_echo.attr, &dev_attr_name.attr, diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h index 78c8ac4951b5..1fecaaf4c8b9 100644 --- a/include/linux/pps_kernel.h +++ b/include/linux/pps_kernel.h @@ -47,6 +47,8 @@ struct pps_device { =20 __u32 assert_sequence; /* PPS assert event seq # */ __u32 clear_sequence; /* PPS clear event seq # */ + struct pps_ktime assert_elapsed_tu; /* PPS elapsed rt assert seq # */ + struct pps_ktime clear_elapsed_tu; /* PPS elapsed rt clear event seq */ struct pps_ktime assert_tu; struct pps_ktime clear_tu; int current_mode; /* PPS mode at event time */ --=20 2.25.1 --00000000000086ad7905ee068a72 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQegYJKoZIhvcNAQcCoIIQazCCEGcCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg 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