From nobody Fri Jun 19 18:17:40 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 484E6C433F5 for ; Thu, 31 Mar 2022 06:51:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231484AbiCaGxQ (ORCPT ); Thu, 31 Mar 2022 02:53:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229987AbiCaGxM (ORCPT ); Thu, 31 Mar 2022 02:53:12 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3A50496B9 for ; Wed, 30 Mar 2022 23:51:25 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id s72so19300770pgc.5 for ; Wed, 30 Mar 2022 23:51:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version; bh=2go30AM6s1+rpwIDiMsCnwxcwKQ9Y07g7Va/NsxZfp4=; b=Ouo5E1bupMEFM09DcSzqwe2AAkzlUKIvSGY4M4QaagQrxM9Daoa1MTarAIYa8tGjq6 GKoW2WQ1lOc3Hd+vlBDb6HHNc40dGhxjAVHuyDptIc/Hf+LeQTKhzh1FSnMwKwJRqAj4 A3N6qJIbZKaRDxDjmZ3HOOFoks9sXzDeQXU5c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version; bh=2go30AM6s1+rpwIDiMsCnwxcwKQ9Y07g7Va/NsxZfp4=; b=Qba55x9wbso44OleXz1Xi8TynubwRXretQcOfHOB2FUoChpMK4ZV9kRersFoyCfC1s VxNleRN8s+n4SPOfcmXjVkxjn4VguNBy6pXvw4WQnnIMYhVRert3jPC5RW9VrJd4AUrE zOoM9+GBtF5UFDLFboqy/75eXpj/Yiwsilolj+sZDexePKTGXA1LGhoEPEwkvs5r+THf PBCjYgr4vd2dn96tRZAZcVkxL6o/sOdiwNnM+VMOVQBRhuklID9B7M7rHZYjVrW+hxJo 1+ipk2ZMCnpJ9Df8mqOWJgtOx5voAGhgur1awejqw6gdcgz+i4rQITqzrCBK8yQ8Q+CB TiPw== X-Gm-Message-State: AOAM530lkTTdMC+0M8f9yt3y5Uv2dlsfaXTrDjSli76SnAYbVz+Gmz6B Ydm4M+rjvejqmk59mElJaqAYUohoWF/cdE4cGbbAp8snTXcg3i6KGhLDscNCdQYzue9MEr7MSST tlGjC1TOJhStKCb1jzNmStMqZRb+pQrM71N/aP5ks725RJl5wsgRNHkE9iGEFyiDp2kVJH3JRap Z3eFNpKpR0Gj+S1x3nEg== X-Google-Smtp-Source: ABdhPJx3dIwUKD23CqBWaepqg1Aw30OmWB5Bwr6kaIXxADzEfh6JEMimeSFM8Rl4WKOs3/5Mm42v4g== X-Received: by 2002:a05:6a00:1791:b0:4fb:2796:83a1 with SMTP id s17-20020a056a00179100b004fb279683a1mr27221328pfg.36.1648709484665; Wed, 30 Mar 2022 23:51:24 -0700 (PDT) Received: from ldt-sj3-komrakov.dhcp.broadcom.net ([192.19.222.250]) by smtp.gmail.com with ESMTPSA id f30-20020a63755e000000b00381f6b7ef30sm21251753pgn.54.2022.03.30.23.51.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Mar 2022 23:51:24 -0700 (PDT) From: alexander komrakov To: linux-kernel@vger.kernel.org Cc: giometti@enneenne.com, alexander komrakov Subject: [PATCH] Calculate the monotonic clock from the timespec clock to generate PPS elapsed real-time event value and stores the result into /sys/class/pps/pps0/assert_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/class/pps/pps0/assert_elapsed). Whenever AP receives this pulse, kernel's pps driver timestamp this elapsedRealtime event and let this time available via sysfs node (/sys/class/pps/pps0/assert_elapsed) or the IOCTL call. Date: Wed, 30 Mar 2022 23:51:17 -0700 Message-Id: <20220331065117.250375-2-alexander.komrakov@broadcom.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220331065117.250375-1-alexander.komrakov@broadcom.com> References: <20220331065117.250375-1-alexander.komrakov@broadcom.com> MIME-Version: 1.0 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000033655805db7e175a" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --00000000000033655805db7e175a Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" --- 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; /* 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