linux-kernel - Re: [PATCH] xen/events: Add wakeup support to xen-pirq

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Date:   Mon, 31 Jul 2023 13:57:21 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Simon Gaiser <simon@...isiblethingslab.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH] xen/events: Add wakeup support to xen-pirq

On 24.07.23 12:29, Simon Gaiser wrote:
> Simon Gaiser:
>> This allows entering and exiting s2idle. Actual S0ix residency is
>> another topic [1].
>>
>> Without this the ACPI code currently ignores the error enable_irq_wake()
>> returns when being used on a xen-pirq and the system goes to idle for
>> ever since the wakeup IRQ doesn't gets enabled. With [2] the error is
>> handled and the system refuses to go to s2idle.
>>
>> Link: https://lore.kernel.org/xen-devel/9051e484-b128-715a-9253-48af8e47bb9d@invisiblethingslab.com/ # [1]
>> Link: https://lore.kernel.org/linux-acpi/20230313125344.2893-1-simon@invisiblethingslab.com/ # [2]
>> Signed-off-by: Simon Gaiser <simon@...isiblethingslab.com>
>> ---
>>
>> While I think that the set of flags I set is correct, I'm not familiar
>> with that code, so please pay special attention during review if they
>> are actually correct for xen-pirq.
>>
>>   drivers/xen/events/events_base.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
>> index c7715f8bd452..991082f04f05 100644
>> --- a/drivers/xen/events/events_base.c
>> +++ b/drivers/xen/events/events_base.c
>> @@ -2176,6 +2176,10 @@ static struct irq_chip xen_pirq_chip __read_mostly = {
>>   	.irq_set_affinity	= set_affinity_irq,
>>   
>>   	.irq_retrigger		= retrigger_dynirq,
>> +
>> +	.flags                  = IRQCHIP_SKIP_SET_WAKE |
>> +				  IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND |
>> +				  IRQCHIP_MASK_ON_SUSPEND,
>>   };
>>   
>>   static struct irq_chip xen_percpu_chip __read_mostly = {
> ping

Sorry for not answering earlier.

I'm not sure about those flags either. Unfortunately I haven't found any
documentation or comments describing their detailed semantics in a way
enabling me to do a thorough review.

Thomas, are you seeing any problems with specifying those flags?


Juergen

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