From nobody Wed Dec 31 13:52:47 2025 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 3358AC4167B for ; Thu, 2 Nov 2023 00:25:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234374AbjKBAZF (ORCPT ); Wed, 1 Nov 2023 20:25:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229727AbjKBAZD (ORCPT ); Wed, 1 Nov 2023 20:25:03 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C4008110 for ; Wed, 1 Nov 2023 17:25:00 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id d9443c01a7336-1cc4f777ab9so3092625ad.0 for ; Wed, 01 Nov 2023 17:25:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wkennington-com.20230601.gappssmtp.com; s=20230601; t=1698884700; x=1699489500; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=xEH7jgDGNi0IK8LdwBqEJDaZ1nOxkEDv/a4hPy0Cfvs=; b=qbEKCp/0tOv4LAiwqvUbcwVgiEhx+awjBmoUXVMRTHOqU2z/D7coDm0Qi5SJuwYz0X iLHvjqqFtOswbh54SMdjiMOTlSH4fJ/Hw29g2CPDQzI3v0vGAEQxuTczsTXkytXDK62K k2J8Mz5d8DaBovNKoDvG7GTA0nx1ugApviZmTkdnWWufL1e2mEIzGtYQe+yq1aEId3KQ 3gVs4hjvQFrXWw6BB3mqGrSTgk4VgfxGrYfswq+RxU9mm9hRH9flCa/2XKtraS/rIvh7 0A4RREFeMLAkMymCrKK0XROXtie5gfEzFNN2AVBNJ556+7l+VpE/8eNOdCuUey8jKZmt O/QQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698884700; x=1699489500; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=xEH7jgDGNi0IK8LdwBqEJDaZ1nOxkEDv/a4hPy0Cfvs=; b=Pd9K3VK4FhpmG6iega2cer6id4vMBe4yg+kCh+HapmIkDgttzolEIGlcGF680H5rRs mlQ4tI5xuaTRgn1Y+kuBgNo6zdUMG7Q1EKJTAfgAueJgxd3RETfPhpVrB2yD2ITxgdCu 0hpPJ8oiVu04BuMj/o4FY0eGn8c8LQhjb8yyJZsRZjStIRCtVFLv5+43zKpwD6JBoRaQ R7Div/GTyKVBlwVpN/dTC/qlC3MWvp6qTYrgD0cf1jw/JEosB0tLYrdP7G6BtuWzVmGT nsMFZVbwcEkz6Uio0tr9UFRbN/DurBHyQlfoDybgsiKK9w1My89tuw/MltygtEC0AAFh 1mdA== X-Gm-Message-State: AOJu0YxHoXOCochn/TAdgttLrlesw7/aNdaZdAPhB/I/4T4HiqXrsitn mGw6mijwz0oRz097QzgK78i6Fw== X-Google-Smtp-Source: AGHT+IHbe87+pda9KMj8h9yADQPuHza8FZiqPMjNvMkuAQyzoKTXx8xKJQouIlGMQjgJJVcPPWLo1A== X-Received: by 2002:a17:902:904a:b0:1ca:a290:4c0c with SMTP id w10-20020a170902904a00b001caa2904c0cmr13808328plz.16.1698884700253; Wed, 01 Nov 2023 17:25:00 -0700 (PDT) Received: from wak-linux.svl.corp.google.com ([2620:15c:2a3:200:8eb3:7c85:29f7:efa1]) by smtp.gmail.com with ESMTPSA id s18-20020a17090330d200b001c771740da4sm1831210plc.195.2023.11.01.17.24.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Nov 2023 17:24:59 -0700 (PDT) From: william@wkennington.com To: tmaimon77@gmail.com, tali.perry1@gmail.com, avifishman70@gmail.com Cc: linux-arm-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, openbmc@lists.ozlabs.org, Brian Ma , "William A . Kennington III" Subject: [PATCH] ARM: npcm: Add CPU hotplug callbacks for kexec support Date: Wed, 1 Nov 2023 17:24:53 -0700 Message-ID: <20231102002453.1299195-1-william@wkennington.com> X-Mailer: git-send-email 2.42.0.820.g83a721a137-goog MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Brian Ma Add callbacks required for kexec to function. The NPCM7xx/NPCN8xx does not expose controls for powering down CPU cores, so just wait in idle loop. Signed-off-by: Brian Ma Signed-off-by: William A. Kennington III --- arch/arm/mach-npcm/platsmp.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c index 41891d3aa124..6cc7b5894f08 100644 --- a/arch/arm/mach-npcm/platsmp.c +++ b/arch/arm/mach-npcm/platsmp.c @@ -69,10 +69,27 @@ static void __init npcm7xx_smp_prepare_cpus(unsigned in= t max_cpus) =20 iounmap(scu_base); } +#ifdef CONFIG_HOTPLUG_CPU +static void npcm7xx_cpu_die(unsigned int cpu) +{ + while (1) + cpu_do_idle(); +} + +static int npcm7xx_cpu_kill(unsigned int l_cpu) +{ + return 1; +} +#endif + =20 static struct smp_operations npcm7xx_smp_ops __initdata =3D { .smp_prepare_cpus =3D npcm7xx_smp_prepare_cpus, .smp_boot_secondary =3D npcm7xx_smp_boot_secondary, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_die =3D npcm7xx_cpu_die, + .cpu_kill =3D npcm7xx_cpu_kill, +#endif }; =20 CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm750-smp", &npcm7xx_smp_ops= ); --=20 2.42.0.820.g83a721a137-goog