linux-kernel - Re: [PATCH 0/5] Fix regression introduced by set_irq

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Date:	Sat, 5 Dec 2015 18:24:31 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
cc:	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH 0/5] Fix regression introduced by set_irq_flags()
 removal

Thomas,

On Fri, 4 Dec 2015, Thomas Petazzoni wrote:
> Well, the problem is that IRQ_NOAUTOEN is a global flag, which is OK
> for global interrupts, but not good for per-CPU interrupts, since you
> don't have the information on a per-CPU basis of which interrupt was
> enabled before suspend, and therefore should be re-enabled after resume.
> 
> Until now, we don't have the problem since the only per-CPU interrupt
> we were using was the local timer interrupt, and the local timers on
> secondary CPUs are switched off during suspend and re-enabled during
> resume. So re-enabling the interrupt on the boot CPU on resume is
> sufficient.
> 
> However, our network driver recently switched to using per-CPU
> interrupts as well, and in this case, it is really important to be able
> to re-enable the per-CPU interrupts and the appropriate CPUs at resume
> time. Since our HW registers are made so that it is not possible to
> read out at suspend time which interrupts are enabled, we have to ask
> the Linux kernel at resume time which interrupts should be re-enabled
> at the HW level. Which is what my more complicated series was doing.
> 
> Do you have other suggestions to allow us to know which per-CPU
> interrupts should be re-enabled on the different CPUs at resume time ?

Ok. That makes sense. So I'm going to pick up the core change.

Thanks,

	tglx
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