linux-kernel - Re: [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity

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Date:   Thu, 26 Nov 2020 11:29:54 +0000
From:   John Garry <john.garry@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>, <gregkh@...uxfoundation.org>,
        <rafael@...nel.org>, <martin.petersen@...cle.com>,
        <jejb@...ux.ibm.com>, <linuxarm@...wei.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] genirq/affinity: Add irq_update_affinity_desc()

Hi Marc,

> 
> I did:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=irq/hacks 

ok, I'll have a look

>>
>> You still should be able to enable my favorite
>> CONFIG_DEBUG_TEST_DRIVER_REMOVE=y, while the distro still boot. But
>> I'll just test if you want.
> 
> Ah! Let me try that then. Having been debugging some ugly driver removal
> lately, I wish I had known that config option and inflicted it on their
> authors...

Just in case - be careful with this one! It kills the boot of many 
systems, but D05 should be fine.

> 
> [...]
> 
>>> And while the mbigen port that is connected to the SAS controller
>>> doesn't seem to be shared between endpoints, some other ports definitely
>>> are:
>>>
>>> # cat /sys/kernel/debug/irq/domains/\\_SB.MBI1
>>> name:   \_SB.MBI1
>>>   size:   409
>>>   mapped: 192
>>>   flags:  0x00000003
>>>
>>> [...]
>>>
>>> I guess that the other 217 lines are connected somewhere.
>>>
>>
>> I think that is not the right one. See
>> https://github.com/tianocore/edk2-platforms/blob/master/Silicon/Hisilicon/Hi1616/D05AcpiTables/Dsdt/D05Sas.asl#L101 
>>
>>
> 
> I know, I was just outlining the fact that some of the mbigen
> ports are shared between devices, and MBI1 seems to be an example
> of that (though my reading of ASL is... primitive).

Ah, ok. So this one is for the networking subsystem, and it does have 
many devices in the topology model, but I can't claim to known much more 
than that.

Thanks,
John