Re: RPI 4B on UEFI: xhci0 disconnects under high load

Hi Mark,

Thanks for your quick response!  It appears that I had missed that this
changeset was required.  Let me update to the most recent revision and try
again.  Yes, I have been using the github mirror.  Are there any other
patches I should consider applying?

Yours,
Robert Clausecker

On Thu, Sep 24, 2020 at 06:19:36PM -0700, Mark Millard wrote:
> 
> 
> On 2020-Sep-24, at 15:47, Robert Clausecker <[email protected]> wrote:
> 
> > Good evening!
> > 
> > I have set up a FreeBSD system on a Raspberry Pi 4B as described
> > in bug #249520 (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249520).
> > After setting up the USB drive on a USB 2.0 port, the system boots.
> > However, when the system is under high I/O load (I tested this by
> > compiling a Go toolchain), the USB controller eventually hangs and
> > causes the system to effectively crash:
> > 
> > ---
> > xhci_interrupt: host system error
> > xhci0: Resetting controller
> 
> Looks like prior history to the above would be
> appropriate. (The later messages likely are
> consequences of the above.)
> 
> Also: ed6978a9a70 in github is from:
> 
> QUOTE
> Author: ian
> Date: Mon Sep 14 17:33:28 2020
> New Revision: 365729
> URL: 
> https://svnweb.freebsd.org/changeset/base/365729
> 
> Log:
>   Add product ID strings for a couple Microchip usb hubs.  Also, update the
>   vendor ID string to say just "Microchip Technology" -- the buyout of
>   Standard Microsystems happened in 2012 and the SMC/SMSC names are pretty
>   much retired at this point.
> END QUOTE
> 
> 
> but there is a more recent check-in required to
> avoid at least one way of getting "Resetting controller"
> for -mcpu=cortex-a72 :
> 
> QUOTE
> Author: hselasky
> Date: Sat Sep 19 22:37:45 2020
> New Revision: 365918
> URL: 
> https://svnweb.freebsd.org/changeset/base/365918
> 
> Log:
>   Fix for use of the XHCI driver on Cortex-A72 by adding a missing cache
>   flush operation before writing to the XHCI_ERSTBA_LO/HI register(s).
> END QUOTE
> 
> [I do suggest that you report which git repository that you
> are referencing since there are multiple ones right now that
> have differing hashes. I guessed github from "(master)",
> figuring that the cgit-beta.freebsd.org one would have
> "(main)".]
> 
> > uhub1: at usbus0, port 1, addr 1 (disconnected)
> > ugen0.2: <vendor 0x2109 USB2.0 Hub> at usbus0 (disconnected)
> > uhub2: at uhub1, port 1, addr 1 (disconnected)
> > ugen0.3: <ASIX Elec. Corp. AX88x72A> at usbus0 (disconnected)
> > axe0: at uhub2, port 2, addr 2 (disconnected)
> > ukphy0: detached
> > miibus0: detached
> > axe0: detached
> > ugen0.4: <VLI Manufacture String VLI Product String> at usbus0 (disconnected)
> > umass0: at uhub2, port 4, addr 3 (disconnected)
> > (da0:umass-sim0:0:0:0): WRITE(10). CDB: 2a 00 01 85 d9 0d 00 00 80 00 
> > (da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
> > (da0:umass-sim0:0:0:0): Retrying command, 3 more tries remain
> > da0 at umass-sim0 bus 0 scbus0 target 0 lun 0
> > da0: <WDC WDS2 40G2G0B-00EP UJ43>  s/n ABCDEFA74566 detached
> > Solaris: WARNING: Pool 'tau' has encountered an uncorrectable I/O failure and has been suspended.
> > 
> > Solaris: WARNING: Pool 'tau' has encountered an uncorrectable I/O failure and has been suspended.
> > ---
> 
> The above messages I think are just consequences of earlier
> problems.
> 
> > This is despite having applied D25219 and the D26493--D26496 series
> > of patches which were supposed to address this sort of issue.  The same
> > issue does not seem to appear with an older kernel to which the
> > D26493--D26496 series of patches was not applied and which was not
> > compiled with -mcpu=cortex-a72.  The older kernel identifies itself as
> > 
> >    FreeBSD 13.0-CURRENT #2 ed6978a9a70-c271559(master)-dirty
> > 
> > It's the one I described in my earlier mails to this list.  So it seems
> > that in this case, pulling in patches meant to fix a bug seem to have
> > introduced in this first place.  Any idea what could have happened?
> 
> I strongly suggest using a FreeBSD vintage that includes
> the corrected XHCI driver.
> 
> ===
> Mark Millard
> marklmi at yahoo.com
> ( dsl-only.net went
> away in early 2018-Mar)
> 
> 

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