From patchwork Sat Mar 27 18:06:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 12168595 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=-12.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,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 74692C433DB for ; Sat, 27 Mar 2021 18:07:47 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0F17F61971 for ; Sat, 27 Mar 2021 18:07:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0F17F61971 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:MIME-Version:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Message-Id:Date:Subject:Cc:To:From:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=tJdGygRcLFzLaPAvpFxGE7QsMa6R/M8P8POPOVKL1YU=; b=Kt0Bl6J1B1UfXYsek2/12ZK09w 9pDT9vwQwXfvSl1DrdDR2ldHRNYmEPCPZoUiGAipGOmJzJJKtEm2lFeZ/SAmCZAbgtbtqWaZJwrUE gXujUACmTlOOymypRae+iNm6D6W6FF73lVsexAFC++HXIWVw37aK0eWq+odL6KlFRjG5Z45Tcb3lK S9eGQzqdKvkCKfUpPAqVFqL0YPuaekphkmLLSYJZ+Hnxph8hdUsF5K8IwVskh1fTlT13MtpuHr4RV yvhe+hcKWZggsP7Kj519NWt2OF3XRHkYx+H2T/jFiQHKea0k2XTx3Wm0XkmmcY5vrxnd//Yec1inc R4EMlpZA==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lQDLS-005OOy-Ve; Sat, 27 Mar 2021 18:07:35 +0000 Received: from mail.kernel.org ([198.145.29.99]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lQDLO-005OO1-RE for linux-riscv@lists.infradead.org; Sat, 27 Mar 2021 18:07:33 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3102E61971; Sat, 27 Mar 2021 18:07:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616868447; bh=jOjbe1bkmnmiLoMyYXpPV5LKMugQ9fEQ5nrJ29GUIc4=; h=From:To:Cc:Subject:Date:From; b=QnO8uaJANl2WK3/TSy5NyvRa0HtcCox/KyFmkdXVNBiD5Sv3pjR2yMw5wuHbViQ+Q QqPhA4BcmkYLmox7w0qz3woi53OwRGpbXq0B2pMx6s9iav0OFIAyWboLfCk3jIg4Vq KfW+vK5Bg9FDTLXGknXKye9nVGP4IS9rhMb5qJpG7CWRQenDNQ446u404J9fU9tWXK vFOw4Ix6lYhPvksO+5OCMBdbBGN6VNQUAEbRX+q0JdrFlCy+gI1xBKsgNJFww60rNf NgEMC1SJP2ewGymKaa4Czon2swVmLU4sAx76arr2ZujjZ/EhFPPc32OQLQfx7+crSe WN+Z+3cByBzSg== From: guoren@kernel.org To: guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-csky@vger.kernel.org, linux-arch@vger.kernel.org, Guo Ren Subject: [PATCH v4 0/4] riscv: Add qspinlock/qrwlock Date: Sat, 27 Mar 2021 18:06:35 +0000 Message-Id: <1616868399-82848-1-git-send-email-guoren@kernel.org> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210327_180731_374379_3A88CA56 X-CRM114-Status: UNSURE ( 6.01 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.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 architecture which hasn't xchg16 atomic instruction.) Change V4: - Remove custom sub-word xchg implementation - Add ARCH_USE_QUEUED_SPINLOCKS_XCHG32 in locking/qspinlock Change V3: - Coding convention by Peter Zijlstra's advices Change V2: - Coding convention in cmpxchg.h - Re-implement short xchg - Remove char & cmpxchg implementations 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(-)