From patchwork Fri Nov 4 09:30:41 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: sourab.gupta@intel.com X-Patchwork-Id: 9412151 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0F94B60722 for ; Fri, 4 Nov 2016 09:29:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0FA9A2ADBD for ; Fri, 4 Nov 2016 09:29:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 032162A336; Fri, 4 Nov 2016 09:29:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id ACE372A336 for ; Fri, 4 Nov 2016 09:29:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2A1746E8EB; Fri, 4 Nov 2016 09:29:38 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5C9176E8EB for ; Fri, 4 Nov 2016 09:29:37 +0000 (UTC) Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by orsmga103.jf.intel.com with ESMTP; 04 Nov 2016 02:29:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,442,1473145200"; d="scan'208";a="187548451" Received: from sourab-desktop.iind.intel.com ([10.223.82.156]) by fmsmga004.fm.intel.com with ESMTP; 04 Nov 2016 02:29:34 -0700 From: sourab.gupta@intel.com To: intel-gfx@lists.freedesktop.org Date: Fri, 4 Nov 2016 15:00:41 +0530 Message-Id: <1478251844-23509-13-git-send-email-sourab.gupta@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1478251844-23509-1-git-send-email-sourab.gupta@intel.com> References: <1478251844-23509-1-git-send-email-sourab.gupta@intel.com> Cc: "Christopher S . Hall" , Daniel Vetter , Sourab Gupta , Matthew Auld , Thomas Gleixner Subject: [Intel-gfx] [PATCH 12/15] time: Expose current clocksource in use by timekeeping framework X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP From: Sourab Gupta For the drivers to be able to use the cross timestamp framework, they need the information of current clocksource being used by the kernel timekeeping. This is needed since the callback given by driver into the get_device_system_crosststamp(), in order to synchronously read the device time and system counter value, requires the knowledge of the clocksource being used to read system counter value (as a part of struct system_counterval_t). Signed-off-by: Sourab Gupta --- include/linux/timekeeping.h | 5 +++++ kernel/time/timekeeping.c | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index 816b754..101aaa3 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -336,6 +336,11 @@ extern int get_device_system_crosststamp( struct system_device_crosststamp *xtstamp); /* + * Get current clocksource used by system timekeeping framework + */ +struct clocksource *get_current_clocksource(void); + +/* * Simultaneously snapshot realtime and monotonic raw clocks */ extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index e07fb09..bb1e9c0 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1138,6 +1138,18 @@ int get_device_system_crosststamp(int (*get_time_fn) EXPORT_SYMBOL_GPL(get_device_system_crosststamp); /** + * get_current_clocksource - Returns the current clocksource in used by tk_core + * + */ +struct clocksource *get_current_clocksource(void) +{ + struct timekeeper *tk = &tk_core.timekeeper; + + return tk->tkr_mono.clock; +} +EXPORT_SYMBOL_GPL(get_current_clocksource); + +/** * do_gettimeofday - Returns the time of day in a timeval * @tv: pointer to the timeval to be set *