From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935023Ab3E2CLH (ORCPT ); Tue, 28 May 2013 22:11:07 -0400 Received: from mail-wi0-f169.google.com ([209.85.212.169]:48667 "EHLO mail-wi0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934980Ab3E2CLA (ORCPT ); Tue, 28 May 2013 22:11:00 -0400 From: Grant Likely To: linux-kernel@vger.kernel.org, tglx@linutronix.de Cc: Grant Likely Subject: [PATCH 1/3] irqchip: Add mask to block out invalid irqs Date: Wed, 29 May 2013 03:10:52 +0100 Message-Id: <1369793454-19197-2-git-send-email-grant.likely@linaro.org> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1369793454-19197-1-git-send-email-grant.likely@linaro.org> References: <1369793454-19197-1-git-send-email-grant.likely@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some controllers have irqs that aren't wired up and must never be used. For the generic chip attached to an irq_domain this provides a mask that can be used to block out particular irqs so that they never get mapped. Signed-off-by: Grant Likely Cc: Thomas Gleixner --- include/linux/irq.h | 2 ++ kernel/irq/generic-chip.c | 3 +++ 2 files changed, 5 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index af7052c..298a9b9 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -679,6 +679,7 @@ struct irq_chip_type { * @num_ct: Number of available irq_chip_type instances (usually 1) * @private: Private data for non generic chip callbacks * @installed: bitfield to denote installed interrupts + * @unused: bitfield to denote unused interrupts * @domain: irq domain pointer * @list: List head for keeping track of instances * @chip_types: Array of interrupt irq_chip_types @@ -702,6 +703,7 @@ struct irq_chip_generic { unsigned int num_ct; void *private; unsigned long installed; + unsigned long unused; struct irq_domain *domain; struct list_head list; struct irq_chip_type chip_types[0]; diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c index 8e4d6bd..7b44aa2 100644 --- a/kernel/irq/generic-chip.c +++ b/kernel/irq/generic-chip.c @@ -359,6 +359,9 @@ static int irq_map_generic_chip(struct irq_domain *d, unsigned int virq, idx = hw_irq % dgc->irqs_per_chip; + if (test_bit(idx, &gc->unused)) + return -ENOTSUPP; + if (test_bit(idx, &gc->installed)) return -EBUSY; -- 1.8.1.2