From: David Runge <dave@sleepmap.de>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux1394-devel@lists.sourceforge.net,
linux-rt-users@vger.kernel.org,
"Ahmed S. Darwish" <a.darwish@linutronix.de>
Subject: Re: firewire-ohci fails to initialize Texas Instruments XIO2213A/B/XIO2221 based controller on realtime kernels [5.4.91-rt50, 5.10.8-rt24]
Date: Sun, 12 Sep 2021 20:53:50 +0200 [thread overview]
Message-ID: <YT5MvpE5yrqj/5WI@hmbx> (raw)
In-Reply-To: <YTx7EVV5vFuhKM5i@workstation>
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On 2021-09-11 18:46:57 (+0900), Takashi Sakamoto wrote:
> Hi,
>
> On Fri, Sep 10, 2021 at 01:55:41PM +0200, Sebastian Andrzej Siewior wrote:
> > On 2021-09-08 11:17:18 [+0900], Takashi Sakamoto wrote:
> > > Hi,
> > Hi,
> >
> > > According to the log, the task of 'pipewire-media-:2554' is blocked during
> > > 122 seconds by call of 'wait_for_completion()' in code of
> > > 'fw_run_transaction()'. This is odd in two points of transaction service
> > > programmed in Linux FireWire subsystem:
> > >
> > > 1. The process context should be awakened by softIRQ context, which should
> > > be scheduled by hwIRQ context for hardware interrupt of OHCI 1394
> > > controller.
> > > 2. Even if the softIRQ context is not invoked, the process context
> > > should be awakened by wheel timer context, which is scheduled to finish
> > > the transaction several jiffies later (originally prepared for the case
> > > of split-transaction). In the case, the result of transaction is
> > > 'RCODE_CANCELLED'.
> >
> >
> > Side note: David is using PREEMPT_RT and his problem can be reduced to
> > plain vanilla with `threadirqs' boot option. Back in February I sent him
> > a patch [0] which inlines the tasklet job as I assumed it is not good
> > reset the IRQ-event in the tasklet/workqueue. It seemed to improve the
> > situtation as it recognized the device attached to the bus but ended
> > then in the same timeout behaviour as now.
> >
> > [0] https://https://lkml.kernel.org/r/.kernel.org/all/20210218083849.iitcrhdgv2oajfhv@linutronix.de/
>
> Thanks for the side note, and I apologize to follow the thread partially,
> not entire.
>
> Furthermore, I'd like to correct my misunderstanding about the 2nd point
> since the timer wheel context is scheduled only when the peer of
> transaction transfer ack_pending for the request subaction. Without the
> hwIRQ context, the task is blocked ever anyway.
Thanks at any rate to look into this! It is much appreciated!
Is there anything further I can try to debug this using threadirqs? It
would be really amazing to be able to use this device on PREEMPT_RT
again (especially given that now the ALSA driver has improved so
drastically). :)
Best,
David
--
https://sleepmap.de
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next prev parent reply other threads:[~2021-09-12 18:53 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-23 11:59 firewire-ohci fails to initialize Texas Instruments XIO2213A/B/XIO2221 based controller on realtime kernels [5.4.91-rt50, 5.10.8-rt24] David Runge
2021-01-28 6:28 ` Ahmed S. Darwish
2021-01-28 21:41 ` David Runge
2021-01-29 17:04 ` Sebastian Andrzej Siewior
2021-01-30 11:46 ` David Runge
2021-02-01 8:34 ` Sebastian Andrzej Siewior
2021-02-05 11:26 ` Sebastian Andrzej Siewior
2021-02-05 23:22 ` David Runge
2021-02-07 9:58 ` David Runge
2021-02-08 9:19 ` Sebastian Andrzej Siewior
2021-02-14 19:16 ` David Runge
2021-02-18 8:38 ` Sebastian Andrzej Siewior
2021-02-18 9:27 ` Sebastian Andrzej Siewior
2021-03-08 14:12 ` Sebastian Andrzej Siewior
2021-03-10 18:15 ` David Runge
2021-09-07 23:17 ` David Runge
2021-09-08 2:17 ` Takashi Sakamoto
2021-09-08 17:30 ` David Runge
2021-09-09 0:46 ` Takashi Sakamoto
2021-09-12 18:44 ` David Runge
2021-09-10 11:55 ` Sebastian Andrzej Siewior
2021-09-11 9:46 ` Takashi Sakamoto
2021-09-12 18:53 ` David Runge [this message]
2022-01-05 21:01 ` Holger Dehnhardt
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