From patchwork Fri Sep 13 18:19:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Marussi X-Patchwork-Id: 11145071 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C8CE51599 for ; Fri, 13 Sep 2019 18:22:51 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A7057206A5 for ; Fri, 13 Sep 2019 18:22:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="WSq1phtT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A7057206A5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To: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=NLIZ1FmHs+sZ4TTffzlvCT4iCfrKjn58eNqobUaYDfA=; b=WSq1phtTu6O24tdGjZn5e8VKQX 6fSRkw+XpC2kI9a5IhXVFhyhP5ccxtU3JgZeanAFGYN2ie5L36e90rzaKRwGs9Q76rXiQCwCkC18a wx0Ge81/5S0BL3MMnAaYBVbcL8bAkW7yMeb2tDKXjUfj6+Gb2ZLKRgLW8B/ZQwmADZ/cBM0CDAGGS vGS+SyJchKyycve2QAfQ9azpSx9rM/ezQpsjgV3VM/s7eclWDh/gJWAgge4wabUMd/OhtCMYyccl5 IvsK16G5h4HIHLLo/uHibGE7YSDvFpPNcljciKUJPz2BvNkp67lETrjXJab3Bmt4wzPpc5QbuvWXj 8pOj03QA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1i8qDb-0006nf-3H; Fri, 13 Sep 2019 18:22:51 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1i8qBs-0005C4-AM for linux-arm-kernel@lists.infradead.org; Fri, 13 Sep 2019 18:21:05 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E41D228; Fri, 13 Sep 2019 11:21:03 -0700 (PDT) Received: from e120937-lin.cambridge.arm.com (e120937-lin.cambridge.arm.com [10.1.197.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 765133F71F; Fri, 13 Sep 2019 11:21:01 -0700 (PDT) From: Cristian Marussi To: linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 07/12] arm64: smp: add arch specific cpu parking helper Date: Fri, 13 Sep 2019 19:19:48 +0100 Message-Id: <20190913181953.45748-8-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190913181953.45748-1-cristian.marussi@arm.com> References: <20190913181953.45748-1-cristian.marussi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190913_112104_513988_B3E163A3 X-CRM114-Status: UNSURE ( 7.01 ) X-CRM114-Notice: Please train this message. X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, mark.rutland@arm.com, sparclinux@vger.kernel.org, dzickus@redhat.com, ehabkost@redhat.com, peterz@infradead.org, catalin.marinas@arm.com, x86@kernel.org, linux@armlinux.org.uk, davem@davemloft.net, hch@infradead.org, takahiro.akashi@linaro.org, mingo@redhat.com, james.morse@arm.com, hidehiro.kawai.ez@hitachi.com, tglx@linutronix.de, will@kernel.org, dave.martin@arm.com, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Add an arm64 specific helper which parks the cpu in a more architecture efficient way. Signed-off-by: Cristian Marussi --- arch/arm64/kernel/smp.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index f0cc2bf84aaa..539e8db5c1ba 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -947,6 +947,12 @@ void tick_broadcast(const struct cpumask *mask) } #endif +void arch_smp_cpu_park(void) +{ + while (1) + cpu_park_loop(); +} + void arch_smp_cpus_stop_complete(void) { sdei_mask_local_cpu();