From nobody Wed Sep 17 09:03:38 2025 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 0B11EC76196 for ; Tue, 11 Apr 2023 00:39:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229773AbjDKAjp (ORCPT ); Mon, 10 Apr 2023 20:39:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40276 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229640AbjDKAjn (ORCPT ); Mon, 10 Apr 2023 20:39:43 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 980F5269E for ; Mon, 10 Apr 2023 17:39:42 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id nh20-20020a17090b365400b0024496d637e1so11593062pjb.5 for ; Mon, 10 Apr 2023 17:39:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1681173582; h=mime-version:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to; bh=DchW70QoPX3pGKCfRid9SEWcjX4QCHK98jYufnmuBXY=; b=W6YK9olDTSTk1vCyRaInO+oFjXBKLBLbA6TObDQCEADXnIRwUec1oXbMhzmNBR9zp1 AjNZN+qUKWP87f5zojz0CnzCG+IvryWqIWyZH49qtrvRl+9nCRWEpXHW6AUADsv37mFQ SW5oJhsE0QGgEDKP3ZDF0xnhuoWpb7F52xHH4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1681173582; h=mime-version:message-id:date:subject:cc:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=DchW70QoPX3pGKCfRid9SEWcjX4QCHK98jYufnmuBXY=; b=uoAs2s+Wv4EcDigekVg/sAbKtGO5nmYlVUt4v+aGuX5xSus3SSFCS4uJO23NCTZvsc FnjhnwxW0nyRkoe/ZzfTLAngwYxwg9aMHPIloMeylW0+dfqBGlg5g2n9j9kMerGNnuIK LBo5v/UjYxULEecd902pyVuJU0fCZUhA6Psv3z7HRAxddQazhRbecWKFMTleZ2NUCQbB B6XFlxIe18RbmnM4fAfwCcu77hnxF/aP9WvBO3kCWZsbrjt6A/4al5EHQHAfXFQ3OQCu NsazRZvBHK7iXdcOk7SVsX4dW7JGodz3eT78CwGrkStlBzoRa4+ndsWvOZNCugLbsHHW 68wg== X-Gm-Message-State: AAQBX9dXsQU9um81r3pcov4BJlteWjYPMx7atkpDcNsb0VrIGpMh+f95 6ApeHp7H6b8L6zelW4gk+LqpX2lqA33Ny88ugtN6lwlfoLpLJfBp43DK8vjxu18P1MDdd2d/RvH XWqVIubfMaB+/U+nMiB0DtUhGMn+TKSWMl5ShvpnTKhqNCG9+jhldeC1vCz3oN/2ohbksV215iN EjhT3eE099DfaYce1+BcTg X-Google-Smtp-Source: AKy350ZypkVR58hytI/GgT+2yPdKrL/A8FTDWRqFhyiMYQrDjdsdp13iAApoCh6vdQA+7HzdPXsS7g== X-Received: by 2002:a17:902:db10:b0:19a:b754:4053 with SMTP id m16-20020a170902db1000b0019ab7544053mr21313846plx.26.1681173581514; Mon, 10 Apr 2023 17:39:41 -0700 (PDT) Received: from ldt-sj3-komrakov.dhcp.broadcom.net ([192.19.222.250]) by smtp.gmail.com with ESMTPSA id x6-20020a63aa46000000b0050f9b7e64fasm7570525pgo.77.2023.04.10.17.39.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Apr 2023 17:39:41 -0700 (PDT) From: Alexander Komrakov To: linux-kernel@vger.kernel.org Cc: giometti@enneenne.com, gregkh@linuxfoundation.org, Alexander Komrakov Subject: [PATCH v6] pps: Add elapsed realtime timestamping Date: Mon, 10 Apr 2023 17:39:53 -0700 Message-Id: <20230411003953.519629-1-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="0000000000002a73ed05f904bac4" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000002a73ed05f904bac4 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Some applications like Android needs elapsed realtime timestamping to PPS pulse for its clock management. Add sysfs node for this. Signed-off-by: Alexander Komrakov --- Changes in v6: - Removed "staging",wrap changelog text at 72 columns - clock_gettime removed, trailing whitespaces removed=20 - added, extra spaces removed - Rename sprintf() to sysfs_emit()=20 - "Real-time assert event" info added to driver-api/pps.rst - new entries were moved below the main pps entry - Use pps/ppsX/ instead of pps/pps0/ Documentation/ABI/testing/sysfs-pps | 27 +++++++++++++++++++++++ Documentation/driver-api/pps.rst | 19 ++++++++++++++++ drivers/pps/kapi.c | 24 +++++++++++++++++--- drivers/pps/sysfs.c | 34 +++++++++++++++++++++++++++++ include/linux/pps_kernel.h | 2 ++ 5 files changed, 103 insertions(+), 3 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-pps b/Documentation/ABI/testin= g/sysfs-pps index 25028c7bc37d..ac5051059fc3 100644 --- a/Documentation/ABI/testing/sysfs-pps +++ b/Documentation/ABI/testing/sysfs-pps @@ -71,3 +71,30 @@ Description: =20 If the source is not connected with any device the content of this file is empty. + +What: /sys/class/pps/ppsX/assert_elapsed +Date: October 2021 +Contact: Alexander Komrakov +Description: + The /sys/class/pps/ppsX/assert_elapsed file reports the + elapsed real-time assert events and the elapsed + real-time assert sequence number of the X-th source + in the 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 the form: + + .# + + If the source has no elapsed real-time clear events the + content of this file is empty. diff --git a/Documentation/driver-api/pps.rst b/Documentation/driver-api/pp= s.rst index 2d6b99766ee8..bd0e63f15f95 100644 --- a/Documentation/driver-api/pps.rst +++ b/Documentation/driver-api/pps.rst @@ -167,6 +167,25 @@ sequence number. Other files are: * path: reports the PPS source's device path, that is the device the PPS source is connected to (if it exists). =20 +Real-time assert event:: + + Calculate the monotonic clock from the timespec clock to generate PPS e= lapsed + real-time event value and store the result into /sys/class/pps/pps0/ass= ert_elapsed. + Because we have requirements to make sure the delta between standard ti= me, + 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 driv= er + /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. + + The device's Unix epoch time system clock is not monotonic; it can jump= forwards + or backwards unpredictably and may be changed at any time by the user, + so this time should not be used to order or compare locations. + Prefer for that purpose, as the elapsed realtime clock is guaranteed to= be monotonic. + =20 Testing the PPS support ----------------------- diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c index d9d566f70ed1..1f3ddccf9642 100644 --- a/drivers/pps/kapi.c +++ b/drivers/pps/kapi.c @@ -162,11 +162,21 @@ 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 }; + struct timespec64 ts64 =3D { .tv_sec =3D 0, .tv_nsec =3D 0 }; =20 /* check event type */ BUG_ON((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) =3D=3D 0); =20 - dev_dbg(pps->dev, "PPS event at %lld.%09ld\n", + /* Calculate the monotonic clock from the timespec clock and stores the r= esult in pps_ktime format + ktime_get_boottime_ts64() : because elapsed realtime includes time spe= nt in sleep */ + ktime_get_boottime_ts64(&ts64); + timespec_to_pps_ktime(&ts_real_elapsed,ts64); + + dev_dbg(pps->dev, "PPS event (monotonic) at %lld.%09d\n", + (s64)ts_real_elapsed.sec, ts_real_elapsed.nsec); + + 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 +191,15 @@ 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 +209,15 @@ 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..983f16b86a62 100644 --- a/drivers/pps/sysfs.c +++ b/drivers/pps/sysfs.c @@ -10,6 +10,7 @@ #include #include #include +#include =20 /* * Attribute functions @@ -29,6 +30,21 @@ 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 sysfs_emit(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 +59,22 @@ 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 sysfs_emit(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) { @@ -82,6 +114,8 @@ static DEVICE_ATTR_RO(path); static struct attribute *pps_attrs[] =3D { &dev_attr_assert.attr, &dev_attr_clear.attr, + &dev_attr_assert_elapsed.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..807642da12f7 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 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