From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752757AbaEAXTA (ORCPT ); Thu, 1 May 2014 19:19:00 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:29825 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751217AbaEAXS5 (ORCPT ); Thu, 1 May 2014 19:18:57 -0400 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Tony Luck Cc: linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH 6/8] irq: Add new reserved_irqs clear/mark functions Date: Thu, 1 May 2014 16:18:20 -0700 Message-Id: <1398986302-30455-7-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.4.5 In-Reply-To: <1398986302-30455-1-git-send-email-yinghai@kernel.org> References: <1398986302-30455-1-git-send-email-yinghai@kernel.org> X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Prepare for ioapic hotplug. Signed-off-by: Yinghai Lu --- include/linux/irq.h | 3 +++ kernel/irq/irqdesc.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 71 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 02dc0e4..2ba3245 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -603,6 +603,9 @@ static inline u32 irq_get_trigger_type(unsigned int irq) return d ? irqd_get_trigger_type(d) : 0; } +int irq_clear_reserved_irqs(unsigned int from, unsigned int cnt); +int irq_mark_reserved_irqs(int irq, unsigned int from, unsigned int cnt); + int __irq_alloc_descs(int irq, unsigned int from, unsigned int cnt, int node, struct module *owner); diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 49bf891..865ebc0 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -97,6 +97,7 @@ int nr_irqs = NR_IRQS; EXPORT_SYMBOL_GPL(nr_irqs); static DEFINE_MUTEX(sparse_irq_lock); +static DECLARE_BITMAP(reserved_irqs, IRQ_BITMAP_BITS); static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS); #ifdef CONFIG_SPARSE_IRQ @@ -400,6 +401,73 @@ err: EXPORT_SYMBOL_GPL(__irq_alloc_descs); /** + * irq_clear_reserved_irqs - clear irqs reserved + * @from: clear from irq number + * @cnt: number of irqs to clear + * + * Returns 0 on success or an appropriate error code + */ +int irq_clear_reserved_irqs(unsigned int from, unsigned int cnt) +{ + if (!cnt || (from + cnt) > nr_irqs) + return -EINVAL; + + mutex_lock(&sparse_irq_lock); + bitmap_clear(reserved_irqs, from, cnt); + mutex_unlock(&sparse_irq_lock); + + return 0; +} + +/** + * irq_mark_reserved_irqs - mark irqs reserved + * @irq: Allocate for specific irq number if irq >= 0 + * @from: mark from irq number + * @cnt: number of irqs to mark + * + * Returns the first irq number or error code + */ +int irq_mark_reserved_irqs(int irq, unsigned int from, unsigned int cnt) +{ + unsigned int start, reserve; + int ret; + + if (!cnt) + return -EINVAL; + + if (irq >= 0) { + if (from > irq) + return -EINVAL; + from = irq; + } + + mutex_lock(&sparse_irq_lock); + start = bitmap_find_next_zero_area(allocated_irqs, IRQ_BITMAP_BITS, + from, cnt, 0); + ret = -EEXIST; + if (irq >= 0 && start != irq) + goto err; + + if (start + cnt > nr_irqs) { + ret = irq_expand_nr_irqs(start + cnt); + if (ret) + goto err; + } + + reserve = bitmap_find_next_zero_area(reserved_irqs, nr_irqs, start, + cnt, 0); + if (reserve == start) { + ret = start; + bitmap_set(reserved_irqs, start, cnt); + } else + ret = -EEXIST; + +err: + mutex_unlock(&sparse_irq_lock); + return ret; +} + +/** * irq_get_next_irq - get next allocated irq number * @offset: where to start the search * -- 1.8.4.5