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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 DE20AC433DF for ; Mon, 17 Aug 2020 17:36:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB0B82063A for ; Mon, 17 Aug 2020 17:36:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597685797; bh=WE+uSikW384/lDpstgKl9Ks5l2pEQaqvx23IxVZjKmA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ztOLwIIu0Y9e7/hT5b0FO3jb/jfSOV1DdfXgSxb3WDeP/L5UPpZliiwJayeXd3DXp AlGhHsz1OuZn3ULlvt283uS78xxvVw7iREe89tKn9ipwNeiehfj71SxnbYkw/VIiI8 7EAGBBz9H35sfG1uUhJyAzYFVhRJJSBp8oK5v/qQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731311AbgHQRgg (ORCPT ); Mon, 17 Aug 2020 13:36:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:57994 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730036AbgHQQRg (ORCPT ); Mon, 17 Aug 2020 12:17:36 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 4925622BF3; Mon, 17 Aug 2020 16:17:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597681055; bh=WE+uSikW384/lDpstgKl9Ks5l2pEQaqvx23IxVZjKmA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BiioFDVkmV/zn8zzMG9on7oYhdj8bcLdqHlu2n4xk/3cpgpEgvgEPhs9rjXQIC2JS ekPmekzJAJVwbQVmZsMqUcLgwxI3u65gowcWZ/Xj6As027cJ5mEaWLMTTEiUYvWaod 2hzITFLfepwAQoCR7V2sL6UoFce9rSMpmmpHSKnE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dave Anglin , Helge Deller Subject: [PATCH 4.19 162/168] parisc: Implement __smp_store_release and __smp_load_acquire barriers Date: Mon, 17 Aug 2020 17:18:13 +0200 Message-Id: <20200817143741.752606471@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817143733.692105228@linuxfoundation.org> References: <20200817143733.692105228@linuxfoundation.org> User-Agent: quilt/0.66 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 From: John David Anglin commit e96ebd589debd9a6a793608c4ec7019c38785dea upstream. This patch implements the __smp_store_release and __smp_load_acquire barriers using ordered stores and loads. This avoids the sync instruction present in the generic implementation. Cc: # 4.14+ Signed-off-by: Dave Anglin Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman --- arch/parisc/include/asm/barrier.h | 61 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) --- a/arch/parisc/include/asm/barrier.h +++ b/arch/parisc/include/asm/barrier.h @@ -26,6 +26,67 @@ #define __smp_rmb() mb() #define __smp_wmb() mb() +#define __smp_store_release(p, v) \ +do { \ + typeof(p) __p = (p); \ + union { typeof(*p) __val; char __c[1]; } __u = \ + { .__val = (__force typeof(*p)) (v) }; \ + compiletime_assert_atomic_type(*p); \ + switch (sizeof(*p)) { \ + case 1: \ + asm volatile("stb,ma %0,0(%1)" \ + : : "r"(*(__u8 *)__u.__c), "r"(__p) \ + : "memory"); \ + break; \ + case 2: \ + asm volatile("sth,ma %0,0(%1)" \ + : : "r"(*(__u16 *)__u.__c), "r"(__p) \ + : "memory"); \ + break; \ + case 4: \ + asm volatile("stw,ma %0,0(%1)" \ + : : "r"(*(__u32 *)__u.__c), "r"(__p) \ + : "memory"); \ + break; \ + case 8: \ + if (IS_ENABLED(CONFIG_64BIT)) \ + asm volatile("std,ma %0,0(%1)" \ + : : "r"(*(__u64 *)__u.__c), "r"(__p) \ + : "memory"); \ + break; \ + } \ +} while (0) + +#define __smp_load_acquire(p) \ +({ \ + union { typeof(*p) __val; char __c[1]; } __u; \ + typeof(p) __p = (p); \ + compiletime_assert_atomic_type(*p); \ + switch (sizeof(*p)) { \ + case 1: \ + asm volatile("ldb,ma 0(%1),%0" \ + : "=r"(*(__u8 *)__u.__c) : "r"(__p) \ + : "memory"); \ + break; \ + case 2: \ + asm volatile("ldh,ma 0(%1),%0" \ + : "=r"(*(__u16 *)__u.__c) : "r"(__p) \ + : "memory"); \ + break; \ + case 4: \ + asm volatile("ldw,ma 0(%1),%0" \ + : "=r"(*(__u32 *)__u.__c) : "r"(__p) \ + : "memory"); \ + break; \ + case 8: \ + if (IS_ENABLED(CONFIG_64BIT)) \ + asm volatile("ldd,ma 0(%1),%0" \ + : "=r"(*(__u64 *)__u.__c) : "r"(__p) \ + : "memory"); \ + break; \ + } \ + __u.__val; \ +}) #include #endif /* !__ASSEMBLY__ */