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=-8.7 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 36AFAC04A6B for ; Thu, 9 May 2019 01:47:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04F4721019 for ; Thu, 9 May 2019 01:47:25 +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="RwjDRorZ"; dkim=fail reason="key not found in DNS" (0-bit key) header.d=codeaurora.org header.i=@codeaurora.org header.b="ar31+3M3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726511AbfEIBrX (ORCPT ); Wed, 8 May 2019 21:47:23 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:60528 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725832AbfEIBrX (ORCPT ); Wed, 8 May 2019 21:47:23 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 9833A60850; Thu, 9 May 2019 01:47:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1557366442; bh=9rdLCUt1L7AFehmpyE7HdkJhWiTHmika/QMX7/o7pCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RwjDRorZwpBgD6+a7BfemykODFvTIegs5vhmQoZq7/4n9dZjQSdkQe0cBSxAM+xF4 jOwS18X2Rfzp90CZ9C1v8/0s3zstKwuKDuoy4hTX6TuG4xutMPDEVG2c5YzbVrN9AF RqjEItoOdn9uOZ7d1t2xotukGU8z7Ku7RqGTrbEo= Received: from th-lint-015.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: psodagud@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 384526081E; Thu, 9 May 2019 01:47:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1557366441; bh=9rdLCUt1L7AFehmpyE7HdkJhWiTHmika/QMX7/o7pCg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ar31+3M3z/rN7xzmoojW/GP84szDsT2hCoebyuYeHRucoaAzTK75bNIE/9iJ3jyaN Et3cl14q13+IHNT+8x6aM+u7ogOVQBVPlKiqhsYE2/Zu0gaaETnixJwvD1sS1pVC1h VLx5VLvWfWTRGeGyvvI21HQRlZ9/ULhJLKyCb1n0= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 384526081E Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=psodagud@codeaurora.org From: Prasad Sodagudi To: sudeep.holla@arm.com, julien.thierry@arm.com, will.deacon@arm.com, catalin.marinas@arm.com, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, akpm@linux-foundation.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Prasad Sodagudi Subject: [PATCH] kernel/panic: Use SYSTEM_RESET2 command for warm reset Date: Wed, 8 May 2019 18:47:12 -0700 Message-Id: <1557366432-352469-1-git-send-email-psodagud@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some platforms may need warm reboot support when kernel crashed for post mortem analysis instead of cold reboot. So use config CONFIG_WARM_REBOOT_ON_PANIC and SYSTEM_RESET2 psci command support for warm reset. Signed-off-by: Prasad Sodagudi --- kernel/panic.c | 4 ++++ lib/Kconfig.debug | 10 ++++++++++ 2 files changed, 14 insertions(+) diff --git a/kernel/panic.c b/kernel/panic.c index c1fcaad..6ab6675 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -198,6 +198,10 @@ void panic(const char *fmt, ...) console_verbose(); bust_spinlocks(1); +#ifdef CONFIG_WARM_REBOOT_ON_PANIC + /* Configure for warm reboot instead of cold reboot. */ + reboot_mode = REBOOT_WARM; +#endif va_start(args, fmt); len = vscnprintf(buf, sizeof(buf), fmt, args); va_end(args); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index d695ec1..2a727d8 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1000,6 +1000,16 @@ config PANIC_TIMEOUT value n > 0 will wait n seconds before rebooting, while a timeout value n < 0 will reboot immediately. +config WARM_REBOOT_ON_PANIC + bool "Warm reboot instead of cold reboot for panic" + default n + help + Some vendor platform may need warm reboot instead of cold reboot + for debugging. Before vendor specific power off driver is + probed, platform always gets cold reset. By setting Y here and + support for PSCI V1.1 is present from firmware, platform would + get warm reset instead of cold reset. + config SCHED_DEBUG bool "Collect scheduler debugging info" depends on DEBUG_KERNEL && PROC_FS -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,\na Linux Foundation Collaborative Project