From: Keith Busch <kbusch@kernel.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: sagi@grimberg.me, Daniel Wagner <dwagner@suse.de>,
linux-nvme@lists.infradead.org, ming.lei@redhat.com,
tglx@linutronix.de, hch@lst.de
Subject: Re: [PATCHv3 1/4] nvme/pci: Disable interrupts for threaded handler
Date: Wed, 11 Dec 2019 00:54:33 +0900 [thread overview]
Message-ID: <20191210155433.GA4424@redsun51.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <20191210152840.xgpibkzex6mhnmne@linutronix.de>
On Tue, Dec 10, 2019 at 04:28:40PM +0100, Sebastian Andrzej Siewior wrote:
> On 2019-12-10 16:12:57 [+0100], Daniel Wagner wrote:
> > On Tue, Dec 10, 2019 at 02:56:19AM +0900, Keith Busch wrote:
> > > static irqreturn_t nvme_irq_check(int irq, void *data)
> > > {
> > > struct nvme_queue *nvmeq = data;
> > > - if (nvme_cqe_pending(nvmeq))
> > > - return IRQ_WAKE_THREAD;
> > > - return IRQ_NONE;
> > > +
> > > + if (!nvme_cqe_pending(nvmeq))
> > > + return IRQ_NONE;
> >
> > IIRC, returning IRQ_NONE tells the irq core code that this is
> > an unhandled IRQ. If the core sees too many of them it will print
> > 'spurious irq' message. See __handle_irq_event_percpu,
> > handle_irq_event_percpu and note_interrupt
>
> This is okay / intended. If nvme_cqe_pending() does not recognise that
> this interrupt belongs to that device then it should return IRQ_NONE.
Also note this patch doesn't change the condition when IRQ_NONE is
returned. We've been doing that since nvme's beginning, as it really is
a spurious interrupt from a likely malfunctioning device.
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next prev parent reply other threads:[~2019-12-10 15:54 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 17:56 [PATCHv3 0/4] nvme pci interrupt handling improvements Keith Busch
2019-12-09 17:56 ` [PATCHv3 1/4] nvme/pci: Disable interrupts for threaded handler Keith Busch
2019-12-10 15:12 ` Daniel Wagner
2019-12-10 15:28 ` Sebastian Andrzej Siewior
2019-12-10 15:54 ` Keith Busch [this message]
2019-12-10 16:44 ` Daniel Wagner
2019-12-10 16:57 ` Keith Busch
2019-12-10 17:11 ` Daniel Wagner
2019-12-12 9:09 ` Christoph Hellwig
2019-12-12 15:53 ` Keith Busch
2019-12-09 17:56 ` [PATCHv3 2/4] nvme/pci: Complete commands from primary handler Keith Busch
2019-12-10 20:00 ` Sagi Grimberg
2019-12-10 20:25 ` Keith Busch
2019-12-10 21:14 ` Sagi Grimberg
2019-12-11 17:35 ` Keith Busch
2019-12-12 0:40 ` Sagi Grimberg
2019-12-12 1:02 ` Keith Busch
2019-12-12 22:55 ` Ming Lei
2019-12-12 23:30 ` Keith Busch
2019-12-13 0:52 ` Ming Lei
2019-12-12 9:14 ` Christoph Hellwig
2019-12-09 17:56 ` [PATCHv3 3/4] nvme/pci: Remove use_threaded_interrupts Keith Busch
2019-12-12 9:14 ` Christoph Hellwig
2019-12-12 15:45 ` Keith Busch
2019-12-18 7:29 ` Ming Lei
2019-12-18 15:50 ` Keith Busch
2019-12-19 1:10 ` Ming Lei
2019-12-09 17:56 ` [PATCHv3 4/4] nvme/pci: Poll threaded completions Keith Busch
2019-12-10 17:43 ` Daniel Wagner
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