From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BDE08C3A589 for ; Thu, 15 Aug 2019 16:40:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7AF3420578 for ; Thu, 15 Aug 2019 16:40:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=arista.com header.i=@arista.com header.b="ogoZopR8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732207AbfHOQix (ORCPT ); Thu, 15 Aug 2019 12:38:53 -0400 Received: from mail-wm1-f65.google.com ([209.85.128.65]:54686 "EHLO mail-wm1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732146AbfHOQiv (ORCPT ); Thu, 15 Aug 2019 12:38:51 -0400 Received: by mail-wm1-f65.google.com with SMTP id p74so1783531wme.4 for ; Thu, 15 Aug 2019 09:38:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=googlenew; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=6riYHreczqodkxWi+cMzcb34SnBjuw/gFUTmbPSlBhc=; b=ogoZopR8kxLSbNtSnxJcM7HYNpPxnloMNhkRdQzlOBpdPYVl4ZiQTJAeM8YKOWpqUX 3Ig+Iloyg2LvDe9nfSnDI92lol2If9rNtkaIr8AOiOgzWOfPGzfWWHcMU1bWeGlt03MP CxIzInneqPrIqGAGKK8S0J7L8Aq1XDCHSvwQYmECySE6FuMxutZJ10inWluZfxXxxXve /+Y9kxV0KAGSpvo+au+s7JTukh71cUd88Lmo7tIJS1zvVKfFp+Rh/O3nLnWB4cjl+qh7 9n5UuJbA8AZxMrAZLsTT7aBr1fYrpOUi0GhuS51iWr5vSFfvfkcdWdw3HLtt8Hsujuno N8yQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=6riYHreczqodkxWi+cMzcb34SnBjuw/gFUTmbPSlBhc=; b=MFnzP7Or1Gd5dIBDrkco5Ga6q11UAEfQXluHigXWwwm/Fy5JD05PRmgQm3c173lFyh ZLMZTrXbZBuJgu9Br5gnaU6uA0GSCSlMnQB1qm6zHbu29gDxtMfui+GbmnInQucELc1D Kln0EWe24rbJmg5Aq9iW48+e/zE4V35UObW0FNgrrS/pNspqJpOw9m/0vPU46ZN0VsHE cHyEnr8CO6PqxO0PpliaM6OQLkQHxw8BYKrvoNAkYsQqlQKtYFwvm8RDbAJaFLBf4FVc ZOGx2CT4paV5KGJ8L637WEvWeLf+wF8EQqht8DGILDV2J2F2uXo2qfUo8VazYKIM87Rq dykA== X-Gm-Message-State: APjAAAVdLRGtV1A7owF/DOWJOkewhXenvItFNdvjSaEo4UaUag1PL6aG pNGpDBFNHVrKGivpHFlZUSOKoxYHf/I= X-Google-Smtp-Source: APXvYqzLGVLjiKtzvNe5FU0arXM4WVBkh0Fh7PQV+Wr8fi9/4cCubo+pJQ4l+P/lanXaNYZAkTqcwQ== X-Received: by 2002:a1c:c90c:: with SMTP id f12mr3448398wmb.23.1565887128296; Thu, 15 Aug 2019 09:38:48 -0700 (PDT) Received: from Mindolluin.ire.aristanetworks.com ([217.173.96.166]) by smtp.gmail.com with ESMTPSA id f7sm5755046wrf.8.2019.08.15.09.38.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Aug 2019 09:38:47 -0700 (PDT) From: Dmitry Safonov To: linux-kernel@vger.kernel.org Cc: Dmitry Safonov <0x7f454c46@gmail.com>, Andrei Vagin , Dmitry Safonov , Adrian Reber , Andrei Vagin , Andy Lutomirski , Arnd Bergmann , Christian Brauner , Cyrill Gorcunov , "Eric W. Biederman" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Jeff Dike , Oleg Nesterov , Pavel Emelyanov , Shuah Khan , Thomas Gleixner , Vincenzo Frascino , containers@lists.linux-foundation.org, criu@openvz.org, linux-api@vger.kernel.org, x86@kernel.org Subject: [PATCHv6 07/36] posix-clocks: Introduce clock_get_ktime() callback Date: Thu, 15 Aug 2019 17:38:07 +0100 Message-Id: <20190815163836.2927-8-dima@arista.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190815163836.2927-1-dima@arista.com> References: <20190815163836.2927-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andrei Vagin The callsite in common_timer_get() has already a comment: /* * The timespec64 based conversion is suboptimal, but it's not * worth to implement yet another callback. */ kc->clock_get(timr->it_clock, &ts64); now = timespec64_to_ktime(ts64); The upcoming support for time namespaces requires to have access to: - The time in a task's time namespace for sys_clock_gettime() - The time in the root name space for common_timer_get() That adds a valid reason to finally implement a separate callback which returns the time in ktime_t format. Suggested-by: Thomas Gleixner Signed-off-by: Andrei Vagin Co-developed-by: Dmitry Safonov Signed-off-by: Dmitry Safonov --- kernel/time/alarmtimer.c | 19 ++++++++++++++++++- kernel/time/posix-timers.c | 26 +++++++++++++++++++++++++- kernel/time/posix-timers.h | 3 +++ 3 files changed, 46 insertions(+), 2 deletions(-) diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index 7732f0aabf6a..c8f8cf3d7d08 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -651,7 +651,7 @@ static int alarm_clock_getres(const clockid_t which_clock, struct timespec64 *tp * @which_clock: clockid * @tp: timespec to fill. * - * Provides the underlying alarm base time. + * Provides the underlying alarm base time in a tasks time namespace. */ static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp) { @@ -663,6 +663,22 @@ static int alarm_clock_get_timespec(clockid_t which_clock, struct timespec64 *tp return base->get_timespec(base->base_clockid, tp); } +/** + * alarm_clock_get_ktime - posix clock_get_ktime interface + * @which_clock: clockid + * + * Provides the underlying alarm base time in the root namespace. + */ +static ktime_t alarm_clock_get_ktime(clockid_t which_clock) +{ + struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)]; + + if (!alarmtimer_get_rtcdev()) + return -EINVAL; + + return base->get_ktime(); +} + /** * alarm_timer_create - posix timer_create interface * @new_timer: k_itimer pointer to manage @@ -826,6 +842,7 @@ static int alarm_timer_nsleep(const clockid_t which_clock, int flags, const struct k_clock alarm_clock = { .clock_getres = alarm_clock_getres, + .clock_get_ktime = alarm_clock_get_ktime, .clock_get_timespec = alarm_clock_get_timespec, .timer_create = alarm_timer_create, .timer_set = common_timer_set, diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index 43049c5f1a22..7cf1216050d1 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -171,6 +171,11 @@ int posix_get_realtime_timespec(clockid_t which_clock, struct timespec64 *tp) return 0; } +static ktime_t posix_get_realtime_ktime(clockid_t which_clock) +{ + return ktime_get_real(); +} + /* Set clock_realtime */ static int posix_clock_realtime_set(const clockid_t which_clock, const struct timespec64 *tp) @@ -193,6 +198,11 @@ static int posix_get_monotonic_timespec(clockid_t which_clock, struct timespec64 return 0; } +static ktime_t posix_get_monotonic_ktime(clockid_t which_clock) +{ + return ktime_get(); +} + /* * Get monotonic-raw time for posix timers */ @@ -228,12 +238,22 @@ int posix_get_boottime_timespec(const clockid_t which_clock, struct timespec64 * return 0; } +static ktime_t posix_get_boottime_ktime(const clockid_t which_clock) +{ + return ktime_get_boottime(); +} + static int posix_get_tai_timespec(clockid_t which_clock, struct timespec64 *tp) { ktime_get_clocktai_ts64(tp); return 0; } +static ktime_t posix_get_tai_ktime(clockid_t which_clock) +{ + return ktime_get_clocktai(); +} + static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) { tp->tv_sec = 0; @@ -781,7 +801,7 @@ static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, * Posix magic: Relative CLOCK_REALTIME timers are not affected by * clock modifications, so they become CLOCK_MONOTONIC based under the * hood. See hrtimer_init(). Update timr->kclock, so the generic - * functions which use timr->kclock->clock_get_timespec() work. + * functions which use timr->kclock->clock_get_*() work. * * Note: it_clock stays unmodified, because the next timer_set() might * use ABSTIME, so it needs to switch back. @@ -1268,6 +1288,7 @@ SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags, static const struct k_clock clock_realtime = { .clock_getres = posix_get_hrtimer_res, .clock_get_timespec = posix_get_realtime_timespec, + .clock_get_ktime = posix_get_realtime_ktime, .clock_set = posix_clock_realtime_set, .clock_adj = posix_clock_realtime_adj, .nsleep = common_nsleep, @@ -1285,6 +1306,7 @@ static const struct k_clock clock_realtime = { static const struct k_clock clock_monotonic = { .clock_getres = posix_get_hrtimer_res, .clock_get_timespec = posix_get_monotonic_timespec, + .clock_get_ktime = posix_get_monotonic_ktime, .nsleep = common_nsleep, .timer_create = common_timer_create, .timer_set = common_timer_set, @@ -1314,6 +1336,7 @@ static const struct k_clock clock_monotonic_coarse = { static const struct k_clock clock_tai = { .clock_getres = posix_get_hrtimer_res, + .clock_get_ktime = posix_get_tai_ktime, .clock_get_timespec = posix_get_tai_timespec, .nsleep = common_nsleep, .timer_create = common_timer_create, @@ -1329,6 +1352,7 @@ static const struct k_clock clock_tai = { static const struct k_clock clock_boottime = { .clock_getres = posix_get_hrtimer_res, + .clock_get_ktime = posix_get_boottime_ktime, .clock_get_timespec = posix_get_boottime_timespec, .nsleep = common_nsleep, .timer_create = common_timer_create, diff --git a/kernel/time/posix-timers.h b/kernel/time/posix-timers.h index b3cc9ee36a6b..183994f7e466 100644 --- a/kernel/time/posix-timers.h +++ b/kernel/time/posix-timers.h @@ -6,8 +6,11 @@ struct k_clock { struct timespec64 *tp); int (*clock_set)(const clockid_t which_clock, const struct timespec64 *tp); + /* Returns the clock value in the current time namespace. */ int (*clock_get_timespec)(const clockid_t which_clock, struct timespec64 *tp); + /* Returns the clock value in the root time namespace. */ + ktime_t (*clock_get_ktime)(const clockid_t which_clock); int (*clock_adj)(const clockid_t which_clock, struct __kernel_timex *tx); int (*timer_create)(struct k_itimer *timer); int (*nsleep)(const clockid_t which_clock, int flags, -- 2.22.0