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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,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 67375ECDE47 for ; Thu, 8 Nov 2018 22:04:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2BDAC20892 for ; Thu, 8 Nov 2018 22:04:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZQwciXhC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2BDAC20892 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731476AbeKIHmT (ORCPT ); Fri, 9 Nov 2018 02:42:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:34100 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728544AbeKIHmT (ORCPT ); Fri, 9 Nov 2018 02:42:19 -0500 Received: from localhost (unknown [208.72.13.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B72882086C; Thu, 8 Nov 2018 22:04:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541714688; bh=6Wru0SEdY49dINhG2O65+1GZ/Np6nLUBUmpPPtyXZqI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZQwciXhCuMcnose+FO3n5hScbmHijLKUrFx1MhzGI5YZbp4JwKpGrrxFI4326j6M2 jPa7qKcr+bHdgdfYuRvOwib+GhlSNpMw2CZTMD2fXATkYXMsstVuyYlOz0fvU74Nxe pzVKnzfzL3oOhBKV0zh86yAu6jr9LdfSCKq836OE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Christian=20S=C3=BCnkenberg?= , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.9 066/171] x86/cpu/cyrix: Add alternative Device ID of Geode GX1 SoC Date: Thu, 8 Nov 2018 13:50:36 -0800 Message-Id: <20181108215132.344839494@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181108215127.257643509@linuxfoundation.org> References: <20181108215127.257643509@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit ae1d557d8f30cb097b4d1f2ab04fa294588ee1cf ] A SoC variant of Geode GX1, notably NSC branded SC1100, seems to report an inverted Device ID in its DIR0 configuration register, specifically 0xb instead of the expected 0x4. Catch this presumably quirky version so it's properly recognized as GX1 and has its cache switched to write-back mode, which provides a significant performance boost in most workloads. SC1100's datasheet "Geode™ SC1100 Information Appliance On a Chip", states in section 1.1.7.1 "Device ID" that device identification values are specified in SC1100's device errata. These, however, seem to not have been publicly released. Wading through a number of boot logs and /proc/cpuinfo dumps found on pastebin and blogs, this patch should mostly be relevant for a number of now admittedly aging Soekris NET4801 and PC Engines WRAP devices, the latter being the platform this issue was discovered on. Performance impact was verified using "openssl speed", with write-back caching scaling throughput between -3% and +41%. Signed-off-by: Christian Sünkenberg Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1496596719.26725.14.camel@student.kit.edu Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- arch/x86/kernel/cpu/cyrix.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/cpu/cyrix.c b/arch/x86/kernel/cpu/cyrix.c index 455d8ada9b9a..d39cfb2c6b63 100644 --- a/arch/x86/kernel/cpu/cyrix.c +++ b/arch/x86/kernel/cpu/cyrix.c @@ -253,6 +253,7 @@ static void init_cyrix(struct cpuinfo_x86 *c) break; case 4: /* MediaGX/GXm or Geode GXM/GXLV/GX1 */ + case 11: /* GX1 with inverted Device ID */ #ifdef CONFIG_PCI { u32 vendor, device; -- 2.17.1