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=-14.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,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 1E80AC433C1 for ; Thu, 25 Mar 2021 07:57:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5D686146D for ; Thu, 25 Mar 2021 07:57:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229664AbhCYH4r (ORCPT ); Thu, 25 Mar 2021 03:56:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:44598 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229519AbhCYH4q (ORCPT ); Thu, 25 Mar 2021 03:56:46 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D59E761945; Thu, 25 Mar 2021 07:56:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616659005; bh=/wwJUDyl0L2cZlkv2+pe9ddYhc6OecFJJCkq6BkU3O0=; h=From:To:Cc:Subject:Date:From; b=OpFmlg9OBvyO10jNum7/CquDBaJxsFlSi9+zj3wgYdbg2fsOreULnLun9bZCz6SXp JKwPRVJP3lF4PdMljN0mTC0wTK8kewvJUOPRgys0fw7ouGfWsTFjb6vIRXA3yMf+qZ L+fKTi1+5bjzf5RMASfAexFZ7PPKNf7Oq+p+VDvyjeze1j4hDMh43j/hYhvJwtACO/ cr93gggBCwAJyE3k053ltgHgXMwridRPmVpdsyS75eCAQdt9IjAebSzKTHGX6Nlerw ZwYdPrxr7fTxULpmjdXr16VMPEokqvEUpzabcJF4cqJXdck/40geNJyQmPgYaaG6C1 vgM5pozmDujrA== From: guoren@kernel.org To: guoren@kernel.org, Anup.Patel@wdc.com Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-arch@vger.kernel.org, tech-unixplatformspec@lists.riscv.org, Guo Ren Subject: [PATCH v3 0/4] riscv: Add qspinlock/qrwlock Date: Thu, 25 Mar 2021 07:55:33 +0000 Message-Id: <1616658937-82063-1-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-csky@vger.kernel.org From: Guo Ren Current riscv is still using baby spinlock implementation. It'll cause fairness and cache line bouncing problems. Many people are involved and pay the efforts to improve it: - The first version of patch was made in 2019.1: https://lore.kernel.org/linux-riscv/20190211043829.30096-1-michaeljclark@mac.com/#r - The second version was made in 2020.11: https://lore.kernel.org/linux-riscv/1606225437-22948-2-git-send-email-guoren@kernel.org/ - A good discussion at Platform HSC.2021-03-08: https://drive.google.com/drive/folders/1ooqdnIsYx7XKor5O1XTtM6D1CHp4hc0p Hope your comments and Tested-by or Co-developed-by or Reviewed-by ... Let's kick the qspinlock into riscv right now (Also for the architectures which doesn't have short atmoic xchg instructions.) Change V3: - Fixup short-xchg asm code (slli -> slliw, srli -> srliw) - Coding convention by Peter Zijlstra's advices Change V2: - Coding convention in cmpxchg.h - Re-implement short xchg - Remove char & cmpxchg implementations V1: (by michael) Guo Ren (3): riscv: cmpxchg.h: Cleanup unused code riscv: cmpxchg.h: Merge macros riscv: cmpxchg.h: Implement xchg for short Michael Clark (1): riscv: Convert custom spinlock/rwlock to generic qspinlock/qrwlock arch/riscv/Kconfig | 2 + arch/riscv/include/asm/Kbuild | 3 + arch/riscv/include/asm/cmpxchg.h | 211 ++++++------------------ arch/riscv/include/asm/spinlock.h | 126 +------------- arch/riscv/include/asm/spinlock_types.h | 15 +- 5 files changed, 58 insertions(+), 299 deletions(-) -- 2.17.1