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Date: Mon, 5 May 2014 18:33:24 -0700 From: Yinghai Lu <yinghai@...nel.org> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com> Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org> Subject: [PATCH v3 6/8] irq: Add new reserved_irqs clear/mark functions Prepare for ioapic hotplug. -v2: Add reserved_or_allocated_irqs to simplify the code. Signed-off-by: Yinghai Lu <yinghai@...nel.org> --- include/linux/irq.h | 3 +++ kernel/irq/irqdesc.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 68 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..d55297a 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -98,6 +98,8 @@ EXPORT_SYMBOL_GPL(nr_irqs); static DEFINE_MUTEX(sparse_irq_lock); static DECLARE_BITMAP(allocated_irqs, IRQ_BITMAP_BITS); +static DECLARE_BITMAP(reserved_irqs, IRQ_BITMAP_BITS); +static DECLARE_BITMAP(reserved_or_allocated_irqs, IRQ_BITMAP_BITS); #ifdef CONFIG_SPARSE_IRQ @@ -400,6 +402,69 @@ 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: Reserve 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) +{ + int start, ret; + + if (!cnt) + return -EINVAL; + + if (irq >= 0) { + if (from > irq) + return -EINVAL; + from = irq; + } + + mutex_lock(&sparse_irq_lock); + bitmap_or(reserved_or_allocated_irqs, reserved_irqs, allocated_irqs, + IRQ_BITMAP_BITS); + start = bitmap_find_next_zero_area(reserved_or_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 < 0) + goto err; + } + + bitmap_set(reserved_irqs, start, cnt); + ret = start; + +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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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