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 80520C6FD1D for ; Fri, 17 Mar 2023 07:47:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230167AbjCQHrn (ORCPT ); Fri, 17 Mar 2023 03:47:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49970 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229477AbjCQHrl (ORCPT ); Fri, 17 Mar 2023 03:47:41 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3238ABCB90 for ; Fri, 17 Mar 2023 00:47:39 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id i5so4501418pla.2 for ; Fri, 17 Mar 2023 00:47:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1679039258; h=mime-version:message-id:date:subject:cc:to:from:from:to:cc:subject :date:message-id:reply-to; bh=r7eceyX3HgbYRuC8v1SKxhY0C+Sl5aAujdTbMfHN5tA=; b=B7WH17yWIsI030JNAknEmY2jCKIiRknef5fi/Rzcq/YtEeuX5PaLjTS92Xjn8GNs0G bkNzYC0uHgdf7/8JNaXoWjjEmcNFrwpyLc9JRnyCQ+/14PeC880siVchKi8kN5+r1nn0 uC838A51ZBjtl3V1PlpYD0fqNue7tcFapLoYc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679039258; h=mime-version:message-id:date:subject:cc:to:from:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=r7eceyX3HgbYRuC8v1SKxhY0C+Sl5aAujdTbMfHN5tA=; b=BQOUdEdRbvus7jNojdpogX4E8Ank0bgLLDnZH5CA8Lbq5nHfbtEhOfGdA7MP++3iAf Je24//n/+6Guf6tNiL+iy7o1yahTXKQCbQlFRK2V3zk5IqOEka2puTlzMUAi1kkxevfv jXaz8HRePOCfpQFIGRKdQSzZXXG1o5wxZq0+i0EH/BaWUo4hkwWBp7AZtBfBaFjbs+33 g6PP4/jtZQYaCcrVSWrGx9CBaf9Cno85U0vjUJUEMGC4PsGHLDvMUpkhpbwsT6vY5/PC okBwtb0W0aehVdtYTkcHq7XNa49soDznq5IzHzN90d+Mp4/t0Q7jWx1C+teTgEsRM8S9 iLGQ== X-Gm-Message-State: AO0yUKVdTcwyYaW1Ia7lZKmSntk/LnWOeln+WprMD+WOmy71YM+ShjJO 42wKXqpB44V5Z2i29KAo0WqBY4Y8c8g5PBrFVAGv0xc/jgS5ooTHxp848TQGe/Xz/+PTdfco7De lkR2oNTkb6BGELvstNYl/KDyIANR+VseqDRxR0Kq6gwqnZvxd8XvZ22nS9RPkz2+QJGTSKOuXVW 55Ftvpak/TKZlmbKFV7MCIMVo= X-Google-Smtp-Source: AK7set988OoI0Gglb1YXDLRUMmPBNbvIuQ899TyEe+EiwpLGOhsQi3kVNvGpC43gvaG6Pi8QBDRQGw== X-Received: by 2002:a17:90b:1b42:b0:23d:3383:1d68 with SMTP id nv2-20020a17090b1b4200b0023d33831d68mr7279840pjb.35.1679039257900; Fri, 17 Mar 2023 00:47:37 -0700 (PDT) Received: from ldt-sj3-komrakov.dhcp.broadcom.net ([192.19.222.250]) by smtp.gmail.com with ESMTPSA id w15-20020a170902a70f00b0019a8468cbe7sm888097plq.224.2023.03.17.00.47.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Mar 2023 00:47:37 -0700 (PDT) From: Alexander Komrakov To: linux-kernel@vger.kernel.org Cc: giometti@enneenne.com, gregkh@linuxfoundation.org, Alexander Komrakov Subject: [PATCH v4] pps: Add elapsed realtime timestamping Date: Fri, 17 Mar 2023 00:47:39 -0700 Message-Id: <20230317074739.193965-1-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="0000000000009331af05f713cac7" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000009331af05f713cac7 Content-Transfer-Encoding: 8bit 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 v4: - Remove "staging",wrap changelog text at 72 columns and remove sysfs_emit() - clock_gettime removed, trailing whitespaces removed, added, spaces removed - Information Real-time assert event added to Documentation/driver-api/pps.rst Documentation/ABI/testing/sysfs-pps | 27 +++++++++++++++++++++++ Documentation/driver-api/pps.rst | 8 +++++++ drivers/pps/Makefile | 4 ++++ drivers/pps/kapi.c | 23 ++++++++++++++++--- drivers/pps/sysfs.c | 34 +++++++++++++++++++++++++++++ include/linux/pps_kernel.h | 2 ++ 6 files changed, 95 insertions(+), 3 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-pps b/Documentation/ABI/testing/sysfs-pps index 25028c7bc37d..031ec89e1ed6 100644 --- a/Documentation/ABI/testing/sysfs-pps +++ b/Documentation/ABI/testing/sysfs-pps @@ -1,3 +1,30 @@ +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-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. + What: /sys/class/pps/ Date: February 2008 Contact: Rodolfo Giometti diff --git a/Documentation/driver-api/pps.rst b/Documentation/driver-api/pps.rst index 2d6b99766ee8..80bd7bf048e8 100644 --- a/Documentation/driver-api/pps.rst +++ b/Documentation/driver-api/pps.rst @@ -167,6 +167,14 @@ 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). +Real-time assert event:: + + Calculate the monotonic clock from the timespec clock to generate PPS elapsed real-time event value and store 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. + Testing the PPS support ----------------------- diff --git a/drivers/pps/Makefile b/drivers/pps/Makefile index ceaf65cc1f1d..443501310445 100644 --- a/drivers/pps/Makefile +++ b/drivers/pps/Makefile @@ -8,4 +8,8 @@ pps_core-$(CONFIG_NTP_PPS) += kc.o obj-$(CONFIG_PPS) := pps_core.o obj-y += clients/ generators/ +ifeq ($(CONFIG_ELAPSED_REALTIME_PPS),y) +EXTRA_CFLAGS += -DENABLE_ELAPSED_REALTIME_PPS +endif + ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG diff --git a/drivers/pps/kapi.c b/drivers/pps/kapi.c index d9d566f70ed1..8a97f4cae9e1 100644 --- a/drivers/pps/kapi.c +++ b/drivers/pps/kapi.c @@ -162,11 +162,20 @@ void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event, unsigned long flags; int captured = 0; struct pps_ktime ts_real = { .sec = 0, .nsec = 0, .flags = 0 }; + struct pps_ktime ts_real_elapsed = { .sec = 0, .nsec = 0, .flags = 0 }; + struct timespec64 ts64 = { .tv_sec = 0, .tv_nsec = 0 }; /* check event type */ BUG_ON((event & (PPS_CAPTUREASSERT | PPS_CAPTURECLEAR)) == 0); + /* Calculate the monotonic clock from the timespec clock and stores the result in pps_ktime format + ktime_get_boottime_ts64() : because elapsed realtime includes time spent in sleep */ + ktime_get_boottime_ts64(&ts64); + timespec_to_pps_ktime(&ts_real_elapsed,ts64); - dev_dbg(pps->dev, "PPS event at %lld.%09ld\n", + 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); timespec_to_pps_ktime(&ts_real, ts->ts_real); @@ -181,11 +190,15 @@ void pps_event(struct pps_device *pps, struct pps_event_time *ts, int event, pps->current_mode = 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); + } /* Save the time stamp */ + pps->assert_elapsed_tu = ts_real_elapsed; pps->assert_tu = ts_real; pps->assert_sequence++; dev_dbg(pps->dev, "capture assert seq #%u\n", @@ -195,11 +208,15 @@ void pps_event(struct pps_device *pps, struct pps_event_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); + } /* Save the time stamp */ + pps->clear_elapsed_tu = ts_real_elapsed; pps->clear_tu = 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..24f505cd7233 100644 --- a/drivers/pps/sysfs.c +++ b/drivers/pps/sysfs.c @@ -10,6 +10,7 @@ #include #include #include +#include /* * Attribute functions @@ -29,6 +30,21 @@ static ssize_t assert_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(assert); +static ssize_t assert_elapsed_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pps_device *pps = 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 *attr, char *buf) { @@ -43,6 +59,22 @@ static ssize_t clear_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(clear); +static ssize_t clear_elapsed_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct pps_device *pps = 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) { @@ -82,6 +114,8 @@ static DEVICE_ATTR_RO(path); static struct attribute *pps_attrs[] = { &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 { __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 */ -- 2.25.1 --0000000000009331af05f713cac7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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