From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Sat, 13 Mar 2010 05:41:13 +0100 (CET) Received: from mail-pw0-f49.google.com ([209.85.160.49]:50819 "EHLO mail-pw0-f49.google.com" rhost-flags-OK-OK-OK-OK) by eddie.linux-mips.org with ESMTP id S1491001Ab0CMElF (ORCPT ); Sat, 13 Mar 2010 05:41:05 +0100 Received: by pwj2 with SMTP id 2so1145438pwj.36 for ; Fri, 12 Mar 2010 20:40:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:cc:subject:date :message-id:x-mailer:mime-version:content-type :content-transfer-encoding; bh=PmhfZVavA9GI1SxBc/5y9Qb8LUrzbS7lKl5advSSUQc=; b=J+JjKnnmUwOyGt6W5CZC1eve1YwK/vaIHFTOYs8kQjD3LD3qtEDwmbDMcyIlH4f6dH OCennhcrlmyKqNUk3DG2lHFqRVZ9WdDm1ggjp9sfLGEAbclOMLH6pQF8Da30/I3F8TSs pHKBSpp5Sr/KdGp/d7j+Lhm2dPaT0grLGD0h4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:mime-version :content-type:content-transfer-encoding; b=KyFNSKwWrVKeW2ANLA/pzix6iEPQ9gOKtvUa3/TBYLECqiBAuDi50gEmQ4OxEUsI99 eFKx25eguZcqnKFRs2lJeC0kT/+jkaYHQLip+os3/4v7CeKwAuYP5M4irM7R1UlbGvT6 ucMKHRLLZkJvZfpCJgaoPRbWxtXLvpzG7zk90= Received: by 10.115.64.6 with SMTP id r6mr3416873wak.85.1268455257628; Fri, 12 Mar 2010 20:40:57 -0800 (PST) Received: from localhost.localdomain ([202.201.12.142]) by mx.google.com with ESMTPS id 21sm2172318pzk.0.2010.03.12.20.40.53 (version=TLSv1/SSLv3 cipher=RC4-MD5); Fri, 12 Mar 2010 20:40:57 -0800 (PST) From: Wu Zhangjin To: Ralf Baechle Cc: linux-mips@linux-mips.org, Shinya Kuribayashi , Wu Zhangjin Subject: [PATCH v3 0/3] Workaround the Out-of-order Issue of Loongson-2F Date: Sat, 13 Mar 2010 12:34:14 +0800 Message-Id: X-Mailer: git-send-email 1.7.0.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 26224 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: wuzhangjin@gmail.com Precedence: bulk X-list: linux-mips From: Wu Zhangjin Hi, Ralf Is that possible to apply this patchset for both 2.6.33(the stable release) and 2.6.34? then we can get a not broken support for loongson-2f with the options(-mfix-loongson2f-nop, -mfix-loongson2f-jump) provided by the latest binutils (>=2.20.1). Thanks & Regards, Wu Zhangjin ------- Changes: v2->v3: o Herein, RAS is short for Return Address Stack not Row Address Strobe, at the same time, the "model" in the translation of Chapter 15 should be "mode". (feedback from Shinya Kuribayashi) v1->v2: o Cleanup some comments and align some instructions. ---- As the Chapter 15: "Errata: Issue of Out-of-order in loongson"[1] shows, to workaround the Issue of Loongson-2F，We need to do: o When switching from user mode to kernel mode, you should flush the branch target history such as BTB and RAS. o Doing some tricks to the indirect branch target to make sure that the indirect branch target can not be in the I/O region. This patchset applied the above methods and for the binutils patch[3] have been merged into binutils 2.20.1, so, it's time to upstream this patchset now. without this patch, the machines will hang when the instruction sequence hit the Out-of-order Issue of Loongson-2F, therefore, this patchset is very urgent for both 2.6.33 and 2.6.34. [1] Chinese Version: http://www.loongson.cn/uploadfile/file/20080821113149.pdf [2] English Version of Chapter 15: http://groups.google.com.hk/group/loongson-dev/msg/e0d2e220958f10a6?dmode=source [3] http://sourceware.org/ml/binutils/2009-11/msg00387.html Regards, Wu Zhangjin Wu Zhangjin (3): Loongson-2F: Flush the branch target history such as BTB and RAS Loongson-2F: Enable fixups of binutils 2.20.1 Loongson-2F: Fixup of problems introduced by -mfix-loongson2f-jump of binutils 2.20.1 arch/mips/Makefile | 4 +++- arch/mips/include/asm/stackframe.h | 19 +++++++++++++++++++ arch/mips/loongson/common/reset.c | 11 ++++++++++- 3 files changed, 32 insertions(+), 2 deletions(-)