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=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 A6F4BC433E0 for ; Wed, 8 Jul 2020 12:07:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7EE3B206C3 for ; Wed, 8 Jul 2020 12:07:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=sifive.com header.i=@sifive.com header.b="rCQ92fw8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729050AbgGHMHB (ORCPT ); Wed, 8 Jul 2020 08:07:01 -0400 Received: from mail-bn8nam12on2056.outbound.protection.outlook.com ([40.107.237.56]:6091 "EHLO NAM12-BN8-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728790AbgGHMHA (ORCPT ); Wed, 8 Jul 2020 08:07:00 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ij1l3p7PQ7Kywlw1FEzYODU2PoltOkyxpOX50ueonjQKKcmuUOlNbE+Dtm+VBe5apq3pB+ZZs4heM/Guq2lBrx/m+0EZZfxYPt0JThecnQr5zovJgNJXrAllv+nvW1iFCa2gVTWWKLVK7aEnlEy2zmZIYtYfz0TpQcYqXTvpQvxZ6goaurlPIth8nOQSW2TAfvbPISpGkmhqUp8AoEyHwx0pMc29HQinRdUqdYx6ewOuO03zH4Yr25qO1TvqHzKaXfG7NpQ04h+5b4iqZ01hsfd6djWeA+sfNhIwsW3FBOWJ8QItkmRe9q7eP7JUcah7qtxTowbH6vjpabQwIu86oA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BWa6RDOmR4LgvQbN3jwSaEV6lOt/aWWwgtfPsDZjZDM=; b=WYOM3qqUK62qb1Rd8pjQkBs9OgwYl72h+8mH6Ldu148bMhsc782SLJIoB2Br2+BErnjx80Rjk+lqNzjQqBznD7NUmc605HHbOjq1Uc1aYAUAbd/aZwdqWoqWXRnFh8m+3E05yGv2q3qYZ4hW7RSfS67bR1oIv6iYpO5ikIAGJDkk+CYeAAoRSZ9Tb1m3lRPrNIkAeGNOtELkye8yHnUmN1Nn3Zi8QdwTJ/0PeYRiEUPoht9LMaLw2jlOhGDdMbtLMUHAIJJWAneSVpfSl/3077M2xKNhGTaFKoj/CMgzwa/Ni7iNSc052C+zAtvyRHjhfwoWGcCtYBBvUIRp9xHPYA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=sifive.com; dmarc=pass action=none header.from=sifive.com; dkim=pass header.d=sifive.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BWa6RDOmR4LgvQbN3jwSaEV6lOt/aWWwgtfPsDZjZDM=; b=rCQ92fw8YG7m6Y/CbZawsl1Rn8VJI6r4RMWwn8wvp+D4vivTaHWFQBMRYF6lcugxU9K3SoIV6LD2uyMY4xuDkIMDOhNZmqa+pI1zC64+ZVzUMzM5tE+6sZ+7J6bpUmmwrT+NRPIIUD368WRIqWSPUjM5K9EXeXnEVKyKwEeFAUw= Received: from BN6PR1301MB2020.namprd13.prod.outlook.com (2603:10b6:405:34::34) by BN6PR13MB1108.namprd13.prod.outlook.com (2603:10b6:404:69::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3174.18; Wed, 8 Jul 2020 12:06:57 +0000 Received: from BN6PR1301MB2020.namprd13.prod.outlook.com ([fe80::481f:d0dc:9069:2c42]) by BN6PR1301MB2020.namprd13.prod.outlook.com ([fe80::481f:d0dc:9069:2c42%3]) with mapi id 15.20.3174.021; Wed, 8 Jul 2020 12:06:57 +0000 From: Yash Shah To: Andreas Schwab CC: "Paul Walmsley ( Sifive)" , "palmer@dabbelt.com" , "robh+dt@kernel.org" , "linux-riscv@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , Sachin Ghadi , "aou@eecs.berkeley.edu" , "anup@brainfault.org" , "lollivier@baylibre.com" , Green Wan , "atish.patra@wdc.com" , "alistair.francis@wdc.com" , "deepa.kernel@gmail.com" , "bmeng.cn@gmail.com" Subject: RE: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive Thread-Topic: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive Thread-Index: AQHWQ9XZeaoAcUonuUqzTiy5jwwbX6jyoJC5gAsX94A= Date: Wed, 8 Jul 2020 12:06:56 +0000 Message-ID: References: <1592308864-30205-1-git-send-email-yash.shah@sifive.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: suse.de; dkim=none (message not signed) header.d=none;suse.de; dmarc=none action=none header.from=sifive.com; x-originating-ip: [110.5.74.232] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 6a52e268-1343-4efa-a8dc-08d823376968 x-ms-traffictypediagnostic: BN6PR13MB1108: x-ld-processed: 22f88e9d-ae0d-4ed9-b984-cdc9be1529f1,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: JwhF9epcsRZJTxVVpH5Fe2P4WP81ZwOAP/QGJ53YRsi33QIA4e3FwZNro7joWIAZ38B7MTnjibLUssV9TipDubz+bIXJA14sv8GKv8O2y1CCLpCtlUaqyK7c1vV9loB0MF2UbY1qqJhYSzaqf3TOAtYEQHB2P+hRG/eMRne+8rPXCtJHr20wRAaROGgMEEDBmOS5leQRU1BMhUhVCUK0gFeWVY9bVAkbCNaAdEp7F4u+t07yzySw/PbSPitq5yKo72eUaYJlGzsiuy6Y75vlcJTy38AxWblq8tPInMWzjaxW9SWs3+YcBSdiQR30IYZbcswrQRTU6zx/26sSAFQZyQ== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BN6PR1301MB2020.namprd13.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(6029001)(346002)(376002)(396003)(39850400004)(136003)(366004)(8936002)(71200400001)(76116006)(8676002)(66476007)(66946007)(44832011)(33656002)(66556008)(64756008)(66446008)(2906002)(316002)(5660300002)(7696005)(55016002)(478600001)(4326008)(26005)(54906003)(186003)(52536014)(6916009)(83380400001)(7416002)(86362001)(53546011)(6506007)(9686003);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata: 3XAjUiBvviMHn9nMcrS/owzjThhZiRv7Wcc6t+66rjxhnsBU0x7y4Oy2vSAaTgJzTfM4zTzf3Kbe/u+vPbgpr0bfG77W+7/AMdKf0X3CByd++CEI/Vq79s35qIQb0Pi/WVQMqrO5awjRFNGST0OnUc2SdMueosDtB2CK9kTe2BQUrjfeO73Y8a4Q3JtffunojfhGxfM3rLMREnCJWuEtA/qT2U34i8bO4dEMQ896AvIfa35BUwmDgfTnrgKzFN3p6VjQ5G6Gn2+jAuyESt7kRJPW+9mRCF9o3By9waYRdn1znRlxBs8oLt7dli8e6GeVKJ8/lv3m0uWfBjo8VhKJ4EwPcGbgOYcatmuR2ZZxWcT9bn8Z5ZUlMHEiRiGnI81pc+AbLdWTeQ2cKzcTgIM9pZwHa49mHI+mvz2Y/9E4kkA0uHk8QZ1ORJ2VJUVIuJ3nqwy62xa1e5bZ+CTshHIKx53VWd1/iXKZvOw8Q3MnVCY= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: sifive.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN6PR1301MB2020.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6a52e268-1343-4efa-a8dc-08d823376968 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jul 2020 12:06:56.9946 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 22f88e9d-ae0d-4ed9-b984-cdc9be1529f1 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: +VF7jIYSVa4ShIcJh5C3wPbSD31f5WOpflZG0VcNm6xWCYhM5cNd7UC6izA6H1oO4V1KutbioBiJCTYqJGz/8g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR13MB1108 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Andreas, > -----Original Message----- > From: Andreas Schwab > Sent: 01 July 2020 16:11 > To: Yash Shah > Cc: Paul Walmsley ( Sifive) ; > palmer@dabbelt.com; robh+dt@kernel.org; linux-riscv@lists.infradead.org; > linux-kernel@vger.kernel.org; devicetree@vger.kernel.org; Sachin Ghadi > ; aou@eecs.berkeley.edu; anup@brainfault.org; > lollivier@baylibre.com; Green Wan ; > atish.patra@wdc.com; alistair.francis@wdc.com; deepa.kernel@gmail.com; > bmeng.cn@gmail.com > Subject: Re: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive >=20 > [External Email] Do not click links or attachments unless you recognize t= he > sender and know the content is safe >=20 > On Jun 16 2020, Yash Shah wrote: >=20 > > The patch series adds the support for dynamic CPU frequency switching > > for FU540-C000 SoC on the HiFive Unleashed board. All the patches are > > based on Paul Walmsley's work. > > > > This series is based on Linux v5.7 and tested on HiFive unleashed board= . >=20 > I'm using that patch with 5.7.5. >=20 > It appears to interfer with serial output when using the ondemand governo= r. >=20 > I also see soft lockups when using the performance governor: >=20 > [ 101.587527] rcu: INFO: rcu_sched self-detected stall on CPU > [ 101.592322] rcu: 0-...!: (932 ticks this GP) > idle=3D11a/1/0x4000000000000004 softirq=3D4301/4301 fqs=3D4 > [ 101.601432] (t=3D6001 jiffies g=3D4017 q=3D859) [ 101.605514] rcu: r= cu_sched > kthread starved for 5984 jiffies! g4017 f0x0 RCU_GP_WAIT_FQS(5) - > >state=3D0x0 ->cpu=3D2 [ 101.615494] rcu: RCU grace-period kthread stack > dump: > [ 101.620530] rcu_sched R running task 0 10 2 0x00= 000000 > [ 101.627560] Call Trace: > [ 101.630004] [] __schedule+0x25c/0x616 [ 101.635205] > [] schedule+0x42/0xb2 [ 101.640070] > [] schedule_timeout+0x56/0xb8 [ 101.645626] > [] rcu_gp_fqs_loop+0x208/0x248 [ 101.651266] > [] rcu_gp_kthread+0xc2/0xcc [ 101.656651] > [] kthread+0xda/0xec [ 101.661426] [= ] > ret_from_exception+0x0/0xc [ 101.666977] Task dump for CPU 0: > [ 101.670187] loop0 R running task 0 655 2 0x00= 000008 > [ 101.677218] Call Trace: > [ 101.679657] [] walk_stackframe+0x0/0xaa [ > 101.685036] [] show_stack+0x2a/0x34 [ 101.690074] > [] sched_show_task.part.0+0xc2/0xd2 [ 101.696154] > [] sched_show_task+0x64/0x66 [ 101.701618] > [] dump_cpu_task+0x3e/0x48 [ 101.706916] > [] rcu_dump_cpu_stacks+0x94/0xce [ 101.712731] > [] print_cpu_stall+0x116/0x18a [ 101.718375] > [] check_cpu_stall+0xcc/0x1a2 [ 101.723929] > [] rcu_pending.constprop.0+0x36/0xaa [ 101.730094] > [] rcu_sched_clock_irq+0xa6/0xea [ 101.735913] > [] update_process_times+0x1e/0x42 [ 101.741821] > [] tick_sched_handle+0x26/0x52 [ 101.747456] > [] tick_sched_timer+0x6a/0xd0 [ 101.753015] > [] __run_hrtimer.constprop.0+0x50/0xe8 > [ 101.759353] [] __hrtimer_run_queues+0x48/0x6c [ > 101.765254] [] hrtimer_interrupt+0xca/0x1d4 [ > 101.770985] [] riscv_timer_interrupt+0x32/0x3a [ > 101.776976] [] do_IRQ+0xa4/0xb8 [ 101.781663] > [] ret_from_exception+0x0/0xc >=20 > Andreas. >=20 > -- > Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint =3D 0196 > BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something > completely different." I am looking into the issues you reported. I will update soon. Thanks for testing. - Yash 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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 640B0C433E0 for ; Wed, 8 Jul 2020 12:07:14 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3013D206C3 for ; Wed, 8 Jul 2020 12:07:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="H3ZwkI+7"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=sifive.com header.i=@sifive.com header.b="rCQ92fw8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3013D206C3 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=sifive.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:References:Message-ID:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=We+3FVZO/7oYrSZJysFX5xUoWgvlew5DM4sRgqmckK4=; b=H3ZwkI+7856hNw/no5MgOPIMB j+2cG/c//qneSpjb5p5FBvt2QMPoEhSWDrQKGYT670P7vSzPbzxDrheA7AFn9+onXKjtWaE0G/Mvn NHDvZodcFdzjcMslB/ryz8O+tUtEy1QGSORMmjuIwsPeLD5avH4krMMF7MGVctYjkW/hKAFuYyaVN i2jMfpVIIrlnsBN2qtEFave+LvVS4FpPlU3WnS5St/7qx7DtnuqY0bh89HUv4skMe8/MIMYyMbNCI jH3Yciv+lH8TuTMLZ98pbMfMTlVicMdaHm7GL+hWXG6kRXIcpoV3rtTwmsf26OURmGx1d5aMibhXR qWAGPnnOQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jt8qx-0004MA-Bc; Wed, 08 Jul 2020 12:07:07 +0000 Received: from mail-bn8nam12on2068.outbound.protection.outlook.com ([40.107.237.68] helo=NAM12-BN8-obe.outbound.protection.outlook.com) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jt8qu-0004LB-8t for linux-riscv@lists.infradead.org; Wed, 08 Jul 2020 12:07:05 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ij1l3p7PQ7Kywlw1FEzYODU2PoltOkyxpOX50ueonjQKKcmuUOlNbE+Dtm+VBe5apq3pB+ZZs4heM/Guq2lBrx/m+0EZZfxYPt0JThecnQr5zovJgNJXrAllv+nvW1iFCa2gVTWWKLVK7aEnlEy2zmZIYtYfz0TpQcYqXTvpQvxZ6goaurlPIth8nOQSW2TAfvbPISpGkmhqUp8AoEyHwx0pMc29HQinRdUqdYx6ewOuO03zH4Yr25qO1TvqHzKaXfG7NpQ04h+5b4iqZ01hsfd6djWeA+sfNhIwsW3FBOWJ8QItkmRe9q7eP7JUcah7qtxTowbH6vjpabQwIu86oA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BWa6RDOmR4LgvQbN3jwSaEV6lOt/aWWwgtfPsDZjZDM=; b=WYOM3qqUK62qb1Rd8pjQkBs9OgwYl72h+8mH6Ldu148bMhsc782SLJIoB2Br2+BErnjx80Rjk+lqNzjQqBznD7NUmc605HHbOjq1Uc1aYAUAbd/aZwdqWoqWXRnFh8m+3E05yGv2q3qYZ4hW7RSfS67bR1oIv6iYpO5ikIAGJDkk+CYeAAoRSZ9Tb1m3lRPrNIkAeGNOtELkye8yHnUmN1Nn3Zi8QdwTJ/0PeYRiEUPoht9LMaLw2jlOhGDdMbtLMUHAIJJWAneSVpfSl/3077M2xKNhGTaFKoj/CMgzwa/Ni7iNSc052C+zAtvyRHjhfwoWGcCtYBBvUIRp9xHPYA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=sifive.com; dmarc=pass action=none header.from=sifive.com; dkim=pass header.d=sifive.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BWa6RDOmR4LgvQbN3jwSaEV6lOt/aWWwgtfPsDZjZDM=; b=rCQ92fw8YG7m6Y/CbZawsl1Rn8VJI6r4RMWwn8wvp+D4vivTaHWFQBMRYF6lcugxU9K3SoIV6LD2uyMY4xuDkIMDOhNZmqa+pI1zC64+ZVzUMzM5tE+6sZ+7J6bpUmmwrT+NRPIIUD368WRIqWSPUjM5K9EXeXnEVKyKwEeFAUw= Received: from BN6PR1301MB2020.namprd13.prod.outlook.com (2603:10b6:405:34::34) by BN6PR13MB1108.namprd13.prod.outlook.com (2603:10b6:404:69::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3174.18; Wed, 8 Jul 2020 12:06:57 +0000 Received: from BN6PR1301MB2020.namprd13.prod.outlook.com ([fe80::481f:d0dc:9069:2c42]) by BN6PR1301MB2020.namprd13.prod.outlook.com ([fe80::481f:d0dc:9069:2c42%3]) with mapi id 15.20.3174.021; Wed, 8 Jul 2020 12:06:57 +0000 From: Yash Shah To: Andreas Schwab Subject: RE: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive Thread-Topic: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive Thread-Index: AQHWQ9XZeaoAcUonuUqzTiy5jwwbX6jyoJC5gAsX94A= Date: Wed, 8 Jul 2020 12:06:56 +0000 Message-ID: References: <1592308864-30205-1-git-send-email-yash.shah@sifive.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: suse.de; dkim=none (message not signed) header.d=none;suse.de; dmarc=none action=none header.from=sifive.com; x-originating-ip: [110.5.74.232] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 6a52e268-1343-4efa-a8dc-08d823376968 x-ms-traffictypediagnostic: BN6PR13MB1108: x-ld-processed: 22f88e9d-ae0d-4ed9-b984-cdc9be1529f1,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: JwhF9epcsRZJTxVVpH5Fe2P4WP81ZwOAP/QGJ53YRsi33QIA4e3FwZNro7joWIAZ38B7MTnjibLUssV9TipDubz+bIXJA14sv8GKv8O2y1CCLpCtlUaqyK7c1vV9loB0MF2UbY1qqJhYSzaqf3TOAtYEQHB2P+hRG/eMRne+8rPXCtJHr20wRAaROGgMEEDBmOS5leQRU1BMhUhVCUK0gFeWVY9bVAkbCNaAdEp7F4u+t07yzySw/PbSPitq5yKo72eUaYJlGzsiuy6Y75vlcJTy38AxWblq8tPInMWzjaxW9SWs3+YcBSdiQR30IYZbcswrQRTU6zx/26sSAFQZyQ== x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:BN6PR1301MB2020.namprd13.prod.outlook.com; PTR:; CAT:NONE; SFTY:; SFS:(6029001)(346002)(376002)(396003)(39850400004)(136003)(366004)(8936002)(71200400001)(76116006)(8676002)(66476007)(66946007)(44832011)(33656002)(66556008)(64756008)(66446008)(2906002)(316002)(5660300002)(7696005)(55016002)(478600001)(4326008)(26005)(54906003)(186003)(52536014)(6916009)(83380400001)(7416002)(86362001)(53546011)(6506007)(9686003); DIR:OUT; SFP:1101; x-ms-exchange-antispam-messagedata: 3XAjUiBvviMHn9nMcrS/owzjThhZiRv7Wcc6t+66rjxhnsBU0x7y4Oy2vSAaTgJzTfM4zTzf3Kbe/u+vPbgpr0bfG77W+7/AMdKf0X3CByd++CEI/Vq79s35qIQb0Pi/WVQMqrO5awjRFNGST0OnUc2SdMueosDtB2CK9kTe2BQUrjfeO73Y8a4Q3JtffunojfhGxfM3rLMREnCJWuEtA/qT2U34i8bO4dEMQ896AvIfa35BUwmDgfTnrgKzFN3p6VjQ5G6Gn2+jAuyESt7kRJPW+9mRCF9o3By9waYRdn1znRlxBs8oLt7dli8e6GeVKJ8/lv3m0uWfBjo8VhKJ4EwPcGbgOYcatmuR2ZZxWcT9bn8Z5ZUlMHEiRiGnI81pc+AbLdWTeQ2cKzcTgIM9pZwHa49mHI+mvz2Y/9E4kkA0uHk8QZ1ORJ2VJUVIuJ3nqwy62xa1e5bZ+CTshHIKx53VWd1/iXKZvOw8Q3MnVCY= MIME-Version: 1.0 X-OriginatorOrg: sifive.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BN6PR1301MB2020.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 6a52e268-1343-4efa-a8dc-08d823376968 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Jul 2020 12:06:56.9946 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 22f88e9d-ae0d-4ed9-b984-cdc9be1529f1 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: +VF7jIYSVa4ShIcJh5C3wPbSD31f5WOpflZG0VcNm6xWCYhM5cNd7UC6izA6H1oO4V1KutbioBiJCTYqJGz/8g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR13MB1108 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200708_080704_356576_13ABED55 X-CRM114-Status: GOOD ( 14.19 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "devicetree@vger.kernel.org" , "aou@eecs.berkeley.edu" , "atish.patra@wdc.com" , "anup@brainfault.org" , "lollivier@baylibre.com" , "linux-kernel@vger.kernel.org" , Green Wan , Sachin Ghadi , "robh+dt@kernel.org" , "palmer@dabbelt.com" , "deepa.kernel@gmail.com" , "Paul Walmsley \( Sifive\)" , "alistair.francis@wdc.com" , "linux-riscv@lists.infradead.org" , "bmeng.cn@gmail.com" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Hi Andreas, > -----Original Message----- > From: Andreas Schwab > Sent: 01 July 2020 16:11 > To: Yash Shah > Cc: Paul Walmsley ( Sifive) ; > palmer@dabbelt.com; robh+dt@kernel.org; linux-riscv@lists.infradead.org; > linux-kernel@vger.kernel.org; devicetree@vger.kernel.org; Sachin Ghadi > ; aou@eecs.berkeley.edu; anup@brainfault.org; > lollivier@baylibre.com; Green Wan ; > atish.patra@wdc.com; alistair.francis@wdc.com; deepa.kernel@gmail.com; > bmeng.cn@gmail.com > Subject: Re: [PATCH 0/3] Dynamic CPU frequency switching for the HiFive > > [External Email] Do not click links or attachments unless you recognize the > sender and know the content is safe > > On Jun 16 2020, Yash Shah wrote: > > > The patch series adds the support for dynamic CPU frequency switching > > for FU540-C000 SoC on the HiFive Unleashed board. All the patches are > > based on Paul Walmsley's work. > > > > This series is based on Linux v5.7 and tested on HiFive unleashed board. > > I'm using that patch with 5.7.5. > > It appears to interfer with serial output when using the ondemand governor. > > I also see soft lockups when using the performance governor: > > [ 101.587527] rcu: INFO: rcu_sched self-detected stall on CPU > [ 101.592322] rcu: 0-...!: (932 ticks this GP) > idle=11a/1/0x4000000000000004 softirq=4301/4301 fqs=4 > [ 101.601432] (t=6001 jiffies g=4017 q=859) [ 101.605514] rcu: rcu_sched > kthread starved for 5984 jiffies! g4017 f0x0 RCU_GP_WAIT_FQS(5) - > >state=0x0 ->cpu=2 [ 101.615494] rcu: RCU grace-period kthread stack > dump: > [ 101.620530] rcu_sched R running task 0 10 2 0x00000000 > [ 101.627560] Call Trace: > [ 101.630004] [] __schedule+0x25c/0x616 [ 101.635205] > [] schedule+0x42/0xb2 [ 101.640070] > [] schedule_timeout+0x56/0xb8 [ 101.645626] > [] rcu_gp_fqs_loop+0x208/0x248 [ 101.651266] > [] rcu_gp_kthread+0xc2/0xcc [ 101.656651] > [] kthread+0xda/0xec [ 101.661426] [] > ret_from_exception+0x0/0xc [ 101.666977] Task dump for CPU 0: > [ 101.670187] loop0 R running task 0 655 2 0x00000008 > [ 101.677218] Call Trace: > [ 101.679657] [] walk_stackframe+0x0/0xaa [ > 101.685036] [] show_stack+0x2a/0x34 [ 101.690074] > [] sched_show_task.part.0+0xc2/0xd2 [ 101.696154] > [] sched_show_task+0x64/0x66 [ 101.701618] > [] dump_cpu_task+0x3e/0x48 [ 101.706916] > [] rcu_dump_cpu_stacks+0x94/0xce [ 101.712731] > [] print_cpu_stall+0x116/0x18a [ 101.718375] > [] check_cpu_stall+0xcc/0x1a2 [ 101.723929] > [] rcu_pending.constprop.0+0x36/0xaa [ 101.730094] > [] rcu_sched_clock_irq+0xa6/0xea [ 101.735913] > [] update_process_times+0x1e/0x42 [ 101.741821] > [] tick_sched_handle+0x26/0x52 [ 101.747456] > [] tick_sched_timer+0x6a/0xd0 [ 101.753015] > [] __run_hrtimer.constprop.0+0x50/0xe8 > [ 101.759353] [] __hrtimer_run_queues+0x48/0x6c [ > 101.765254] [] hrtimer_interrupt+0xca/0x1d4 [ > 101.770985] [] riscv_timer_interrupt+0x32/0x3a [ > 101.776976] [] do_IRQ+0xa4/0xb8 [ 101.781663] > [] ret_from_exception+0x0/0xc > > Andreas. > > -- > Andreas Schwab, SUSE Labs, schwab@suse.de GPG Key fingerprint = 0196 > BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something > completely different." I am looking into the issues you reported. I will update soon. Thanks for testing. - Yash _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv