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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,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 5FA6FC433C1 for ; Mon, 29 Mar 2021 09:06:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 389856188B for ; Mon, 29 Mar 2021 09:06:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235918AbhC2JGM (ORCPT ); Mon, 29 Mar 2021 05:06:12 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:14180 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235955AbhC2IwY (ORCPT ); Mon, 29 Mar 2021 04:52:24 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4F85qZ4dcbzmbHd; Mon, 29 Mar 2021 16:49:46 +0800 (CST) Received: from DESKTOP-FPN2511.china.huawei.com (10.174.187.192) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.498.0; Mon, 29 Mar 2021 16:52:16 +0800 From: Jingyi Wang To: , CC: , , , , , Subject: [RFC PATCH 1/3] irqchip/gic-v3: Make use of ICC_SGI1R IRM bit Date: Mon, 29 Mar 2021 16:52:08 +0800 Message-ID: <20210329085210.11524-2-wangjingyi11@huawei.com> X-Mailer: git-send-email 2.14.1.windows.1 In-Reply-To: <20210329085210.11524-1-wangjingyi11@huawei.com> References: <20210329085210.11524-1-wangjingyi11@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.174.187.192] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org IRM, bit[40] in ICC_SGI1R, determines how the generated SGIs are distributed to PEs. If the bit is set, interrupts are routed to all PEs in the system excluding "self". We use cpumask to determine if this bit should be set and make use of that. This will reduce vm trap when broadcast IPIs are sent. Signed-off-by: Jingyi Wang --- drivers/irqchip/irq-gic-v3.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index eb0ee356a629..8ecc1b274ea8 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -1127,6 +1127,7 @@ static void gic_send_sgi(u64 cluster_id, u16 tlist, unsigned int irq) static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask) { int cpu; + cpumask_t tmp; if (WARN_ON(d->hwirq >= 16)) return; @@ -1137,6 +1138,17 @@ static void gic_ipi_send_mask(struct irq_data *d, const struct cpumask *mask) */ wmb(); + if (!cpumask_and(&tmp, mask, cpumask_of(smp_processor_id()))) { + /* Set Interrupt Routing Mode bit */ + u64 val; + val = (d->hwirq) << ICC_SGI1R_SGI_ID_SHIFT; + val |= BIT_ULL(ICC_SGI1R_IRQ_ROUTING_MODE_BIT); + gic_write_sgi1r(val); + + isb(); + return; + } + for_each_cpu(cpu, mask) { u64 cluster_id = MPIDR_TO_SGI_CLUSTER_ID(cpu_logical_map(cpu)); u16 tlist; -- 2.19.1