From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755376AbcKCMXr (ORCPT ); Thu, 3 Nov 2016 08:23:47 -0400 Received: from us01smtprelay-2.synopsys.com ([198.182.47.9]:57636 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755209AbcKCMXp (ORCPT ); Thu, 3 Nov 2016 08:23:45 -0400 From: Yuriy Kolerov To: linux-snps-arc@lists.infradead.org Cc: Vineet.Gupta1@synopsys.com, Alexey.Brodkin@synopsys.com, tglx@linutronix.de, linux-kernel@vger.kernel.org, Yuriy Kolerov Subject: [PATCH v3 3/3] ARCv2: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core Date: Thu, 3 Nov 2016 15:23:08 +0300 Message-Id: <1478175788-3118-4-git-send-email-yuriy.kolerov@synopsys.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1478175788-3118-1-git-send-email-yuriy.kolerov@synopsys.com> References: <1478175788-3118-1-git-send-email-yuriy.kolerov@synopsys.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ARC linux uses 2 distribution modes for common interrupts: round robin mode (IDU_M_DISTRI_RR) and a simple destination mode (IDU_M_DISTRI_DEST). The first one is used when more than 1 cores may handle a common interrupt and the second one is used when only 1 core may handle a common interrupt. However idu_irq_set_affinity always sets IDU_M_DISTRI_RR for all affinity values. But there is no sense in setting of such mode if only 1 core must handle a common interrupt. Signed-off-by: Yuriy Kolerov --- arch/arc/kernel/mcip.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/arc/kernel/mcip.c b/arch/arc/kernel/mcip.c index 4f4f04b..90f9934 100644 --- a/arch/arc/kernel/mcip.c +++ b/arch/arc/kernel/mcip.c @@ -193,6 +193,8 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask, { unsigned long flags; cpumask_t online; + unsigned int destination_bits; + unsigned int distribution_mode; /* errout if no online cpu per @cpumask */ if (!cpumask_and(&online, cpumask, cpu_online_mask)) @@ -200,8 +202,15 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask, raw_spin_lock_irqsave(&mcip_lock, flags); - idu_set_dest(data->hwirq, cpumask_bits(&online)[0]); - idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, IDU_M_DISTRI_RR); + destination_bits = cpumask_bits(&online)[0]; + idu_set_dest(data->hwirq, destination_bits); + + if (ffs(destination_bits) == fls(destination_bits)) + distribution_mode = IDU_M_DISTRI_DEST; + else + distribution_mode = IDU_M_DISTRI_RR; + + idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, distribution_mode); raw_spin_unlock_irqrestore(&mcip_lock, flags); -- 2.7.4