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=-9.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 29281C04EBF for ; Mon, 3 Dec 2018 12:35:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E151A20850 for ; Mon, 3 Dec 2018 12:35:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=brainfault-org.20150623.gappssmtp.com header.i=@brainfault-org.20150623.gappssmtp.com header.b="uKFkUCDH" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E151A20850 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=brainfault.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726460AbeLCMgb (ORCPT ); Mon, 3 Dec 2018 07:36:31 -0500 Received: from mail-pf1-f193.google.com ([209.85.210.193]:46947 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726238AbeLCMgb (ORCPT ); Mon, 3 Dec 2018 07:36:31 -0500 Received: by mail-pf1-f193.google.com with SMTP id c73so6283819pfe.13 for ; Mon, 03 Dec 2018 04:35:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brainfault-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id; bh=VxYFohe4PUgyDK+i9RF4Q1Ec9VsEPmNXJGRFJEnW1vs=; b=uKFkUCDHyBFIxffqmFqrFo2Lrm1D/9XOiktDmXELXTMfnEF+Oi+5qhVW1A5nilB8Wp iUt4GM5FSlbW+iAllEui54vRSn3ZbKOVMm6VM0RdkcmQufF5ofbl/qIF/CGatdCjss4b rDl2bnBIQihV5XPlFWRu4p9TCRlsBCmEmg4uB+XNW8J4lWpZxsEF9RulOgytPQGHdAl+ FAUhSBSJiN4xVYc5pFma/zjTwhRVW2YsxXaZge780HexD8HarcTOG5hprxg2R22Xi7WU /UwO18Xm05bCfQSNuPXXtbejApKID1fdyErpX9ETMSRBmwKU4dvyKGPL8g69PNQiZXp7 71SQ== 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; bh=VxYFohe4PUgyDK+i9RF4Q1Ec9VsEPmNXJGRFJEnW1vs=; b=i9d7RAcRsjODCXGYt1il/VyHc2/xZ4g6tgQQ+ZDc3n/5rvmAHxJ7CTuWx2w11b2xxM QvFAID4DhIGzVuTLV7iEQ5LaylSThoamMVWqNdbRwBmNC1l/PiEof+In15Tzfrb2FGM1 z74bWL9DEERgVVyhSSzPKl7XwlLMNMzOTvauNRc0mhJzfdNReaeX8h7523xyuq4pOvXd DMY547jdxY4OCepFOLLA0qDPQvbTSCqBGSOCVzSsV46bPGQy+Rgnov0dnB9xSMOK7huC cy9+92Gkq2yICB0ZXESc8At1MxcjUcG27n6tJCDdwr5meuTelJs8RO/+vTIZjf/DxzKF ABdA== X-Gm-Message-State: AA+aEWbp71z+ql8zJR5z2D6j35ayRzVBoPpxGqWE9vDeDMetQ2ExrYGG Cp90QMb0smyXzK0xLoxSp3OWlDK5R3g= X-Google-Smtp-Source: AFSGD/VjrXjEwxL6rQlgvb3LUGa/9olGeUYZNUrpXG7eSbFvcV+DR5I7wzsgt2Gemk0hA84DCbzFxA== X-Received: by 2002:a63:d655:: with SMTP id d21mr11952926pgj.280.1543840538071; Mon, 03 Dec 2018 04:35:38 -0800 (PST) Received: from anup-ubuntu64.qualcomm.com ([106.51.23.39]) by smtp.googlemail.com with ESMTPSA id m20sm14809124pgb.56.2018.12.03.04.35.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Dec 2018 04:35:37 -0800 (PST) From: Anup Patel To: Daniel Lezcano , Thomas Gleixner , Palmer Dabbelt , Albert Ou Cc: Atish Patra , Christoph Hellwig , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: [PATCH] clocksource: riscv_timer: Provide sched_clock Date: Mon, 3 Dec 2018 18:05:24 +0530 Message-Id: <20181203123524.11778-1-anup@brainfault.org> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, we don't have a sched_clock registered for RISC-V systems. This means Linux time keeping will use jiffies (running at HZ) as the default sched_clock. To avoid this, we explicity provide sched_clock using RISC-V rdtime instruction (similar to riscv_timer clocksource). Signed-off-by: Anup Patel --- drivers/clocksource/riscv_timer.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/clocksource/riscv_timer.c b/drivers/clocksource/riscv_timer.c index 084e97dc10ed..431892200a08 100644 --- a/drivers/clocksource/riscv_timer.c +++ b/drivers/clocksource/riscv_timer.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -49,6 +50,11 @@ static unsigned long long riscv_clocksource_rdtime(struct clocksource *cs) return get_cycles64(); } +static u64 riscv_sched_clock(void) +{ + return get_cycles64(); +} + static DEFINE_PER_CPU(struct clocksource, riscv_clocksource) = { .name = "riscv_clocksource", .rating = 300, @@ -97,6 +103,9 @@ static int __init riscv_timer_init_dt(struct device_node *n) cs = per_cpu_ptr(&riscv_clocksource, cpuid); clocksource_register_hz(cs, riscv_timebase); + sched_clock_register(riscv_sched_clock, + BITS_PER_LONG, riscv_timebase); + error = cpuhp_setup_state(CPUHP_AP_RISCV_TIMER_STARTING, "clockevents/riscv/timer:starting", riscv_timer_starting_cpu, riscv_timer_dying_cpu); -- 2.17.1