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_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS 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 D94C2C43219 for ; Wed, 1 May 2019 00:07:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A7BB20866 for ; Wed, 1 May 2019 00:07:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="fsgEQ4A3"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="fsgEQ4A3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727315AbfEAAHc (ORCPT ); Tue, 30 Apr 2019 20:07:32 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:40446 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726115AbfEAAHc (ORCPT ); Tue, 30 Apr 2019 20:07:32 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id A52E6608CC; Wed, 1 May 2019 00:07:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1556669251; bh=dAu7JXFbPaijmiIBB0IbVbY+HYF5UPs/C/cMlmqKdxA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=fsgEQ4A3ntIzvdw5QeNiusiRKjkUrDsXdPVYEDCjnpX/ArGnw4ezRKDO1zES0tr1J OiW8wSq7yrxVBaGcu2qs3HvFPuZiEno+2AiMC2WP6jPoNkFhkRuybKgIYR95R4VJaX bZbH7NU4aeYXG0J3YvwX5ostS23R+b3oXQIxQpps= Received: from mail.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 553E060735; Wed, 1 May 2019 00:07:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1556669251; bh=dAu7JXFbPaijmiIBB0IbVbY+HYF5UPs/C/cMlmqKdxA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=fsgEQ4A3ntIzvdw5QeNiusiRKjkUrDsXdPVYEDCjnpX/ArGnw4ezRKDO1zES0tr1J OiW8wSq7yrxVBaGcu2qs3HvFPuZiEno+2AiMC2WP6jPoNkFhkRuybKgIYR95R4VJaX bZbH7NU4aeYXG0J3YvwX5ostS23R+b3oXQIxQpps= MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 30 Apr 2019 17:07:31 -0700 From: Sodagudi Prasad To: julien.thierry@arm.com, will.deacon@arm.com, catalin.marinas@arm.com, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: PSCI version 1.1 and SYSTEM_RESET2 In-Reply-To: <24970f7101952f347bd4046c9a980473@codeaurora.org> References: <24970f7101952f347bd4046c9a980473@codeaurora.org> Message-ID: X-Sender: psodagud@codeaurora.org User-Agent: Roundcube Webmail/1.2.5 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019-04-30 14:44, Sodagudi Prasad wrote: +Sudeep > Hi Mark/Will, > > I would like to understand whether ARM linux community have plans to > support PSCI version 1.1 or not. > PSCI_1_1 specification introduced support for SYSTEM_RESET2 command > and this new command helps mobile devices to SYSTEM_WARM_RESET > support. Rebooting devices with warm reboot helps to capture the > snapshot of the ram contents for post-mortem analysis. I think, there is a recent discussion from Sudeep for the SYSTEM_RESET2 support. https://patchwork.kernel.org/patch/10884345/ Hi Sudeep, I was going through your discussion in the below list - https://lore.kernel.org/lkml/d73d3580-4ec1-a281-4585-5c776fc08c79@xilinx.com/ There is no provision to set up reboot mode dynamically instead kernel command line parameter. Looking for options to reboot device with warm reboot option when kernel crashed. panic() --> emergency_restart() --> machine_emergency_restart() --> machine_restart(NULL); It would nice if there is a config option to reboot the device either in warm or cold in the case of kernel panic. Calling machine_restart with a NULL parameter for kernel crash is leading to devices cold reboot. -Thanks, Prasad > > -Thanks, Prasad -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, Linux Foundation Collaborative Project