linux-kernel - RE: Question: GPIO driver how to get irq

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Date:	Mon, 25 Apr 2011 13:04:01 +0900
From:	"Tomoya MORINAGA" <tomoya-linux@....okisemi.com>
To:	"'Lars-Peter Clausen'" <lars@...afoo.de>
Cc:	"'Grant Likely'" <grant.likely@...retlab.ca>,
	<linux-kernel@...r.kernel.org>, <toshiharu-linux@....okisemi.com>
Subject: RE: Question: GPIO driver how to get irq_base

Hi Lars,

On Saturday, April 23, 2011 7:15 PM, Lars-Peter Clausen wrote:
> It looks as both your driver and IO-APIC have allocated the 
> same IRQ. You could try to add some debug code to 
> alloc_irq_and_cfg_at to figure out what is going wrong.
> 
> - Lars

Adding debug code like below.

/////////////////////////////////////////////////////////////////////////////////////////////////
static struct irq_cfg *alloc_irq_and_cfg_at(unsigned int at, int node)
{
	int res = irq_alloc_desc_at(at, node);
	struct irq_cfg *cfg;
printk("%s:1 at=%d node=%d res=%d\n", __func__, at, node, res);
	if (res < 0) {
printk("%s:2\n", __func__);
		if (res != -EEXIST)
			return NULL;
printk("%s:3\n", __func__);
		cfg = get_irq_chip_data(at);
printk("%s:4\n", __func__);
		if (cfg)
			return cfg;
	}

	cfg = alloc_irq_cfg(at, node);
printk("%s:5cfg=%p\n", __func__, cfg);
	if (cfg)
		set_irq_chip_data(at, cfg);
	else
		irq_free_desc(at);
printk("%s:6cfg=%p\n", __func__, cfg);
	return cfg;
}
/////////////////////////////////////////////////////////////////////////////////////////////////

The following is kernel boot log.

alloc_irq_and_cfg_at:1 at=1 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=0 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=3 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=4 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=5 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=6 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=7 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=8 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=9 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=10 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=11 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=12 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=13 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=14 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:1 at=15 node=0 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4

alloc_irq_and_cfg_at:1 at=4 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4

alloc_irq_and_cfg_at:1 at=8 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4

alloc_irq_and_cfg_at:1 at=13 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4

alloc_irq_and_cfg_at:1 at=1 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4

alloc_irq_and_cfg_at:1 at=12 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4

alloc_irq_and_cfg_at:1 at=16 node=-1 res=16
alloc_irq_and_cfg_at:5cfg=f599c1b0
alloc_irq_and_cfg_at:6cfg=f599c1b0

alloc_irq_and_cfg_at:1 at=17 node=-1 res=17
alloc_irq_and_cfg_at:5cfg=f599c1a0
alloc_irq_and_cfg_at:6cfg=f599c1a0

alloc_irq_and_cfg_at:1 at=19 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4
alloc_irq_and_cfg_at:5cfg=f5957dc0
alloc_irq_and_cfg_at:6cfg=f5957dc0

alloc_irq_and_cfg_at:1 at=18 node=-1 res=-17
alloc_irq_and_cfg_at:2
alloc_irq_and_cfg_at:3
alloc_irq_and_cfg_at:4


With Best Regards,
-----------------------------------------
Tomoya MORINAGA
OKI SEMICONDUCTOR CO., LTD.

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