linux-kernel - Re: [PATCH v2 15/26] xen, irq: call irq_realloc_desc

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Date:	Fri, 8 Mar 2013 15:01:49 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com
Subject: Re: [PATCH v2 15/26] xen, irq: call irq_realloc_desc_at() at first

On Fri, Mar 08, 2013 at 02:43:57PM -0500, Konrad Rzeszutek Wilk wrote:
> On Fri, Feb 08, 2013 at 11:28:12AM -0800, Yinghai Lu wrote:
> > We will pre-reserve irq for all gsi at first for x86, so we have to
> > use realloc with it.
> 
> Where are the GSI's pre-allocated?

And the answer is in arch_probe_nr_irqs and determined by nr_irqs_gsi.
That data then feeds in early_irq_init which sets the bitmap.

Could you add that please in the git commit if it is not too much
trouble?
> 
> > 
> > Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> > Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> > Cc: xen-devel@...ts.xensource.com
> > ---
> >  drivers/xen/events.c |    8 ++++++--
> >  1 file changed, 6 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/xen/events.c b/drivers/xen/events.c
> > index 0be4df3..dda38db 100644
> > --- a/drivers/xen/events.c
> > +++ b/drivers/xen/events.c
> > @@ -482,8 +482,12 @@ static int __must_check xen_allocate_irq_gsi(unsigned gsi)
> >  	/* Legacy IRQ descriptors are already allocated by the arch. */
> >  	if (gsi < NR_IRQS_LEGACY)
> >  		irq = gsi;
> > -	else
> > -		irq = irq_alloc_desc_at(gsi, -1);
> > +	else {
> > +		/* for x86, irq already get reserved for gsi */
> > +		irq = irq_realloc_desc_at(gsi, -1);
> > +		if (irq < 0)
> > +			irq = irq_alloc_desc_at(gsi, -1);
> > +	}
> >  
> >  	xen_irq_init(irq);
> >  
> > -- 
> > 1.7.10.4
> > 
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