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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 B180AC47E49 for ; Sun, 27 Oct 2019 14:43:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8853D21D81 for ; Sun, 27 Oct 2019 14:43:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572187402; bh=XbLNgU9kPdlH8Fi9JQlXClvf4wOZdwwOaVg4Lg0NAEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OgjbjsvS8qdb0cxG6STN0sUL4vAubpSHY2k9UwJ4No89x5rPS9tr2Mx76UNhCAMcL +uAmzkfOlljv6rJLLyTiKV80Kgt+Cehu/HXEnfdTiumXBPENrmphIIKaDD97MN28CC Vsj3uLm0XI4qNK2NsEpATxNqzuKLPGFDdRbgR2fQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727009AbfJ0OnL (ORCPT ); Sun, 27 Oct 2019 10:43:11 -0400 Received: from mail.kernel.org ([198.145.29.99]:36510 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726690AbfJ0OnK (ORCPT ); Sun, 27 Oct 2019 10:43:10 -0400 Received: from localhost.localdomain (82-132-239-15.dab.02.net [82.132.239.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3C51D21D7F; Sun, 27 Oct 2019 14:43:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572187389; bh=XbLNgU9kPdlH8Fi9JQlXClvf4wOZdwwOaVg4Lg0NAEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zVuATdU0L3w5v+50DmfHU6/yACp0SXjxRlSqpQFjHgh+gp2PZwLS+VMN+vYyGYxD2 NfKEM6jLPx1PxiouSbACXLQmrwTE1ObOZcILq3nJskOLEaEFFk9VJc9s11CxRRjXyV Zfhvc4keMk1Qp/8ZJFiA0XdiL/yS1BOxJX5+fVQQ= From: Marc Zyngier To: kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org Cc: Eric Auger , James Morse , Julien Thierry , Suzuki K Poulose , Thomas Gleixner , Jason Cooper , Lorenzo Pieralisi , Andrew Murray , Zenghui Yu , Jayachandran C , Robert Richter Subject: [PATCH v2 02/36] irqchip/gic-v3-its: Factor out wait_for_syncr primitive Date: Sun, 27 Oct 2019 14:42:00 +0000 Message-Id: <20191027144234.8395-3-maz@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191027144234.8395-1-maz@kernel.org> References: <20191027144234.8395-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Waiting for a redistributor to have performed an operation is a common thing to do, and the idiom is already spread around. As we're going to make even more use of this, let's have a primitive that does just that. Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-gic-v3-its.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index 62e54f1a248b..58cb233cf138 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1075,6 +1075,12 @@ static void lpi_write_config(struct irq_data *d, u8 clr, u8 set) dsb(ishst); } +static void wait_for_syncr(void __iomem *rdbase) +{ + while (gic_read_lpir(rdbase + GICR_SYNCR) & 1) + cpu_relax(); +} + static void lpi_update_config(struct irq_data *d, u8 clr, u8 set) { struct its_device *its_dev = irq_data_get_irq_chip_data(d); @@ -2757,8 +2763,7 @@ static void its_vpe_db_proxy_move(struct its_vpe *vpe, int from, int to) rdbase = per_cpu_ptr(gic_rdists->rdist, from)->rd_base; gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR); - while (gic_read_lpir(rdbase + GICR_SYNCR) & 1) - cpu_relax(); + wait_for_syncr(rdbase); return; } @@ -2914,8 +2919,7 @@ static void its_vpe_send_inv(struct irq_data *d) rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base; gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_INVLPIR); - while (gic_read_lpir(rdbase + GICR_SYNCR) & 1) - cpu_relax(); + wait_for_syncr(rdbase); } else { its_vpe_send_cmd(vpe, its_send_inv); } @@ -2957,8 +2961,7 @@ static int its_vpe_set_irqchip_state(struct irq_data *d, gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_SETLPIR); } else { gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR); - while (gic_read_lpir(rdbase + GICR_SYNCR) & 1) - cpu_relax(); + wait_for_syncr(rdbase); } } else { if (state) -- 2.20.1