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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 0FD2AC3A5A2 for ; Tue, 3 Sep 2019 09:32:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CDD7D22D6D for ; Tue, 3 Sep 2019 09:32:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="oPBuX9ND" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728610AbfICJcx (ORCPT ); Tue, 3 Sep 2019 05:32:53 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:56114 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728548AbfICJcw (ORCPT ); Tue, 3 Sep 2019 05:32:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=dmhOcolDwteguY+iE081eVlDE7gRKOPp9YKrsHrQ23w=; b=oPBuX9NDcklPhh+Ml/2+83UZ5v 4E8VnDLeks2QUrDaE/7YSDMSGIyq9tp8SeN47ZGRQrs2M58SWPJ/haIScuLIhDsKkwGIdxebdMcRt FewpcJ9gMSOe8hRF5kpNXJ8prpWjUc6wK1fuWkC64uarqvg+r2K3+mMZ84WbOBlN3vicQnwYCu2Sk tzD+6LwsH2TXWFfsKkqTAXd1cLKGALdrJBxlwS6JNSpIMHbafFAHFgXx62KW+CeDlrRiVqnyuRnje iWoajAq9TaIWtD69EmrU5M7Xa/diGNoZ0zkRTSyOE1u2sP0X5YAu6614Yr0Fbtp9ios/NakPbfBGi 6R0Ln5sw==; Received: from clnet-p19-102.ikbnet.co.at ([83.175.77.102] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1i55BC-0004Md-FN; Tue, 03 Sep 2019 09:32:50 +0000 From: Christoph Hellwig To: Palmer Dabbelt , Paul Walmsley Cc: Damien Le Moal , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Atish Patra Subject: [PATCH 04/20] riscv: optimize send_ipi_single Date: Tue, 3 Sep 2019 11:32:23 +0200 Message-Id: <20190903093239.21278-5-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190903093239.21278-1-hch@lst.de> References: <20190903093239.21278-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Don't go through send_ipi_mask, but just set the op bit an then pass a simple generate hartid mask directly to sbi_send_ipi. Signed-off-by: Christoph Hellwig Reviewed-by: Atish Patra --- arch/riscv/kernel/smp.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index 2e21669aa068..a3715d621f60 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -94,7 +94,13 @@ static void send_ipi_mask(const struct cpumask *mask, enum ipi_message_type op) static void send_ipi_single(int cpu, enum ipi_message_type op) { - send_ipi_mask(cpumask_of(cpu), op); + int hartid = cpuid_to_hartid_map(cpu); + + smp_mb__before_atomic(); + set_bit(op, &ipi_data[cpu].bits); + smp_mb__after_atomic(); + + sbi_send_ipi(cpumask_bits(cpumask_of(hartid))); } static inline void clear_ipi(void) -- 2.20.1