sparc64/141918: [ehci] ehci_interrupt: unrecoverable error, controller halted (sparc64)

[Marius Strobl]

The following reply was made to PR sparc64/141918; it has been noted by GNATS.

From: Marius Strobl <marius at alchemy.franken.de>
To: Manuel Tobias Schiller <mala at hinterbergen.de>
Cc: bug-followup at FreeBSD.org
Subject: Re: sparc64/141918: [ehci] ehci_interrupt: unrecoverable error, controller halted (sparc64)
Date: Tue, 3 Apr 2012 23:19:52 +0200

 On Mon, Apr 02, 2012 at 01:00:56AM +0200, Manuel Tobias Schiller wrote:
 > On Sun, 1 Apr 2012 12:41:24 +0200
 > Marius Strobl <marius at alchemy.franken.de> wrote:
 > 
 > > Well, the individual patches shouldn't make things worse except for
 > > the second one causing more memory to be used so I'd suggest to
 > > combine them. If in the end things actually work we still can check
 > > what changes are needed for that.
 > > Looking at the Linux USB code, the FreeBSD one doesn't some to honor
 > > some DMA constraints and at least for the alignment it's actually
 > > hard to follow what value eventually is used. One thing that stands
 > > out is that for EHCI, the boundary is 4096. This is most easily fixed
 > > by defining USB_PAGE_SIZE to 4096 in sys/dev/usb/usb_busdma.h.
 > > 
 > > Marius
 > 
 > Ok, the second patch on its own doesn't appear to work either, so I'm
 > trying the combination of patches now. By the way: defining USB_PAGE_SIZE
 > to 4096 in sys/dev/usb/usb_busdma.h is a bad idea - the kernel panics with
 > a backtrace pointing into the mmu-related code. Probably has to do with
 > sparc64 mmu only supporting 8k pages, so I'm not terribly surprised...
 
 Okay, could you please give the following patch a try?
 http://people.freebsd.org/~marius/usb_busdma.diff
 
 Marius