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From: Thomas Gleixner <tglx@linutronix.de>
To: John Garry <john.garry@huawei.com>, Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci@vger.kernel.org, Sagi Grimberg <sagi@grimberg.me>,
	Daniel Wagner <dwagner@suse.de>, Wen Xiong <wenxiong@us.ibm.com>,
	Hannes Reinecke <hare@suse.de>, Keith Busch <kbusch@kernel.org>,
	Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH V4 1/3] driver core: mark device as irq affinity managed if any irq is managed
Date: Wed, 21 Jul 2021 22:22:10 +0200	[thread overview]
Message-ID: <87y29zpgct.ffs@nanos.tec.linutronix.de> (raw)
In-Reply-To: <fe34623e-1074-862d-e822-7359ae4def0f@huawei.com>

On Wed, Jul 21 2021 at 10:44, John Garry wrote:
> On 21/07/2021 08:24, Christoph Hellwig wrote:
>> On Wed, Jul 21, 2021 at 09:20:00AM +0200, Thomas Gleixner wrote:
>>>> Also does the above imply this won't work for your platform MSI case?
>>> The msi descriptors are attached to struct device and independent of
>>> platform/PCI/whatever.
>> That's what I assumed, but this text from John suggested there is
>> something odd about the platform case:
>> 
>> "Did you consider that for PCI .."
>> .
>
> For this special platform MSI case there is a secondary interrupt 
> controller (called mbigen) which generates the MSI on behalf of the 
> device, which I think the MSI belongs to (and not the device, itself).

MBIGEN is a different story because it converts wired interrupts into
MSI interrupts, IOW a MSI based interrupt pin extender.

I might be wrong, but I seriously doubt that any multiqueue device which
wants to use affinity managed interrupts is built on top of that.

Thanks,

        tglx

  reply	other threads:[~2021-07-21 20:22 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-15 12:08 [PATCH V4 0/3] blk-mq: fix blk_mq_alloc_request_hctx Ming Lei
2021-07-15 12:08 ` [PATCH V4 1/3] driver core: mark device as irq affinity managed if any irq is managed Ming Lei
2021-07-15 12:40   ` Greg Kroah-Hartman
2021-07-16  2:17     ` Ming Lei
2021-07-16 20:01   ` Bjorn Helgaas
2021-07-17  9:30     ` Ming Lei
2021-07-21  0:30       ` Bjorn Helgaas
2021-07-19  7:51   ` John Garry
2021-07-19  9:44     ` Christoph Hellwig
2021-07-19 10:39       ` John Garry
2021-07-20  2:38         ` Ming Lei
2021-07-21  7:20       ` Thomas Gleixner
2021-07-21  7:24         ` Christoph Hellwig
2021-07-21  9:44           ` John Garry
2021-07-21 20:22             ` Thomas Gleixner [this message]
2021-07-22  7:48               ` John Garry
2021-07-21 20:14           ` Thomas Gleixner
2021-07-21 20:32             ` Christoph Hellwig
2021-07-21 22:38               ` Thomas Gleixner
2021-07-22  7:46                 ` Christoph Hellwig
2021-07-15 12:08 ` [PATCH V4 2/3] blk-mq: mark if one queue map uses managed irq Ming Lei
2021-07-15 12:08 ` [PATCH V4 3/3] blk-mq: don't deactivate hctx if managed irq isn't used Ming Lei

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