From patchwork Tue Sep 3 09:32:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11127487 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 49C711813 for ; Tue, 3 Sep 2019 09:32:59 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 27F5E22D6D for ; Tue, 3 Sep 2019 09:32:59 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="O674IvGw" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 27F5E22D6D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PgtTugulWtdXoY4pdWYfEEE2yt95ku9EhQwDIOzHR0c=; b=O674IvGwvGHpKt JWrt/YzfJ5zIBMjI6ScDsgeyHTEd/a8fgc9dCToXCh1qIJUCxqRCf1lZ3CdMvTVfrmRtJzI5JnTKA tywrVL/wVtab/bukhrIV1qDj4JxoRgd+afBI29V4TGEnnn05hEtIvTcFCMCCX68UjzVzCG+yJV0eH sPKGGITLl/xiJGLGWCdLlfY1qpIKh0hl8X0dKT4qnpsPYU/G/03SYnK0j9R9U26r72v9MAXCWVRFe KR0Z7OMur4HTA2n3WSJMy2uFlxGfmnTdrXO58WVDHQCVgpt0N3Gv70XEGQxqsqQ8Fhmp3kZX/wxN0 m88hlv3wLd1cu3fgenkw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i55BG-0004Sj-Qx; Tue, 03 Sep 2019 09:32:54 +0000 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 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 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Atish Patra , Damien Le Moal , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-riscv" Errors-To: linux-riscv-bounces+patchwork-linux-riscv=patchwork.kernel.org@lists.infradead.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)