linux-kernel - Re: [Bugfix 1/2] x86, irq, PCI: Keep IRQ assignment for PCI devices during suspend/hibernation

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Date:	Wed, 06 Aug 2014 18:22:52 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Grant Likely <grant.likely@...aro.org>, x86@...nel.org,
	Len Brown <lenb@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [Bugfix 1/2] x86, irq, PCI: Keep IRQ assignment for PCI devices
 during suspend/hibernation



On 2014/8/6 2:37, Borislav Petkov wrote:
> On Tue, Aug 05, 2014 at 11:26:17AM +0800, Jiang Liu wrote:
>> Now IOAPIC driver dynamically allocates IRQ numbers for IOAPIC pins.
>> We need to keep IRQ assignment for PCI devices during suspend/hibernation,
>> otherwise it may cause failure of suspend/hibernation due to:
>> 1) Device driver calls pci_enable_device() to allocate an IRQ number
>>    and register interrupt handler on the returned IRQ.
>> 2) Device driver's suspend callback calls pci_disable_device() and
>>    release assigned IRQ in turn.
>> 3) Device driver's resume callback calls pci_enable_device() to
>>    allocate IRQ number again. A different IRQ number may be assigned
>>    by IOAPIC driver this time.
>> 4) Now the hardware delivers interrupt to the new IRQ but interrupt
>>    handler is still registered against the old IRQ, so it breaks
>>    suspend/hibernation.
>>
>> To fix this issue, we keep IRQ assignment during suspend/hibernation.
>> Flag pci_dev.dev.power.is_prepared is used to detect that
>> pci_disable_device() is called during suspend/hibernation.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
>> ---
>> Hi Borislav,
>> 	Could you please help to review the patch again since I have
>> made changes against the previous version?
> 
> I think you're asking me to test that patch, correct?
> 
> If so, what is the exact tree I need to apply? tip/x86/apic + those two
> patches here? What else? What about the USB chunk which removes the proc
> splat, is that somewhere too? Maybe Linus did pull it already?
> 
> Please specify what exactly I should test.
Hi Borislav,
	I have prepared a tree for you at
https://github.com/jiangliu/linux.git suspend2

It's based on tip/master and includes:
1) the patch to fix warning caused  by USB controller
2) these two patches to fix failure of suspend/hibernation

Could you please help to check whether suspend/hibernation works as
expect on your platforms?
Thanks!
Gerry

> 
> Thanks.
> 
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