Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936187AbcJUWRH (ORCPT ); Fri, 21 Oct 2016 18:17:07 -0400 Received: from us01smtprelay-2.synopsys.com ([198.182.47.9]:40625 "EHLO smtprelay.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935685AbcJUWQq (ORCPT ); Fri, 21 Oct 2016 18:16:46 -0400 From: Yuriy Kolerov To: linux-snps-arc@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Vineet.Gupta1@synopsys.com, Alexey.Brodkin@synopsys.com, Yuriy Kolerov Subject: [PATCH 5/5] ARC: MCIP: Use IDU_M_DISTRI_DEST mode if there is only 1 destination core Date: Sat, 22 Oct 2016 01:15:31 +0300 Message-Id: <1477088131-15822-5-git-send-email-yuriy.kolerov@synopsys.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1477088131-15822-1-git-send-email-yuriy.kolerov@synopsys.com> References: <1477088131-15822-1-git-send-email-yuriy.kolerov@synopsys.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1642 Lines: 46 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 | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/arc/kernel/mcip.c b/arch/arc/kernel/mcip.c index 090f0a1..75e6d73 100644 --- a/arch/arc/kernel/mcip.c +++ b/arch/arc/kernel/mcip.c @@ -197,6 +197,7 @@ idu_irq_set_affinity(struct irq_data *data, const struct cpumask *cpumask, { unsigned long flags; cpumask_t online; + unsigned long dest_bits; /* errout if no online cpu per @cpumask */ if (!cpumask_and(&online, cpumask, cpu_online_mask)) @@ -204,8 +205,14 @@ 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); + dest_bits = cpumask_bits(&online)[0]; + idu_set_dest(data->hwirq, dest_bits); + + if (ffs(dest_bits) == fls(dest_bits)) { + idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, IDU_M_DISTRI_DEST); + } else { + idu_set_mode(data->hwirq, IDU_M_TRIG_LEVEL, IDU_M_DISTRI_RR); + } raw_spin_unlock_irqrestore(&mcip_lock, flags); -- 2.7.4