From: Christoph Hellwig <hch@lst.de>
To: John Garry <john.garry@huawei.com>
Cc: Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@lst.de>,
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, Thomas Gleixner <tglx@linutronix.de>,
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>
Subject: Re: [PATCH V4 1/3] driver core: mark device as irq affinity managed if any irq is managed
Date: Mon, 19 Jul 2021 11:44:14 +0200 [thread overview]
Message-ID: <20210719094414.GC431@lst.de> (raw)
In-Reply-To: <5e534fdc-909e-39b2-521d-31f643a10558@huawei.com>
On Mon, Jul 19, 2021 at 08:51:22AM +0100, John Garry wrote:
>> Address this issue by adding one field of .irq_affinity_managed into
>> 'struct device'.
>>
>> Suggested-by: Christoph Hellwig <hch@lst.de>
>> Signed-off-by: Ming Lei <ming.lei@redhat.com>
>
> Did you consider that for PCI device we effectively have this info already:
>
> bool dev_has_managed_msi_irq(struct device *dev)
> {
> struct msi_desc *desc;
>
> list_for_each_entry(desc, dev_to_msi_list(dev), list) {
> if (desc->affinity && desc->affinity->is_managed)
> return true;
> }
>
> return false;
Just walking the list seems fine to me given that this is not a
performance criticial path. But what are the locking implications?
Also does the above imply this won't work for your platform MSI case?
next prev parent reply other threads:[~2021-07-19 9:44 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 [this message]
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
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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