Re: Oops in UHCI when encountering "host controller process error"

[Jeremy Fitzhardinge]

Alan Stern wrote:
> On Tue, 9 Dec 2008, Jeremy Fitzhardinge wrote:
>
>   
> > Yep, there's something very odd going on in there.  By contrast, does 
> > this look OK?  The allocations are fine, but I'm wondering if the 
> > skeleton QH stuff is all correct; it seems to work OK in this state.
> >
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4000 handle=7e212000
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4080 handle=7e212080
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4100 handle=7e212100
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4180 handle=7e212180
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4200 handle=7e212200
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4280 handle=7e212280
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4300 handle=7e212300
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4380 handle=7e212380
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4400 handle=7e212400
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4480 handle=7e212480
> > uhci_alloc_qh: uhci=ffff88002e5de3d0 qh=ffff88002e5f4500 handle=7e212500
> > Root-hub state: reset   FSBR: 0
> > HC status
> >   usbcmd    =     0000   Maxp32 
> >   usbstat   =     0020   HCHalted 
> >   usbint    =     0000
> >   usbfrnum  =   (0)000
> >   flbaseadd = 7ffd5000
> >   sof       =       40
> >   stat1     =     0080  
> >   stat2     =     0080  
> > Most recent frame: 0 (0)   Last ISO frame: 0 (0)
> > Periodic load table
> >         0       0       0       0       0       0       0       0
> >         0       0       0       0       0       0       0       0
> >         0       0       0       0       0       0       0       0
> >         0       0       0       0       0       0       0       0
> > Total: 0, #INT: 0, #ISO: 0
> > Frame List
> > Skeleton QHs
> > - skel_unlink_qh
> >     [ffff88002e5f4000] Skel QH link (00000001) element (00000001)
> >       queue is empty
> > - skel_iso_qh
> >     [ffff88002e5f4080] Skel QH link (00000001) element (00000001)
> >       queue is empty
> > - skel_int128_qh
> >     [ffff88002e5f4100] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_int64_qh
> >     [ffff88002e5f4180] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_int32_qh
> >     [ffff88002e5f4200] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_int16_qh
> >     [ffff88002e5f4280] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_int8_qh
> >     [ffff88002e5f4300] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_int4_qh
> >     [ffff88002e5f4380] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_int2_qh
> >     [ffff88002e5f4400] Skel QH link (7e212482) element (00000001)
> >       queue is empty
> > - skel_async_qh
> >     [ffff88002e5f4480] Skel QH link (00000001) element (7e215000)
> >       queue is empty
> > [ffff88002e5f3000] link (00000001) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f, PID=69(IN) (buf=00000000)
> > - skel_term_qh
> >     [ffff88002e5f4500] Skel QH link (7e212502) element (7e215000)
> >       queue is empty
> >     
>
> Yes, that looks normal for a controller with no activity.
>   

OK.  If the controller is idle and the kernel wants to submit it some 
new work, where does that happen?  Can I stick a uhci_sprint_schedule() 
there to see the state of the structures before it starts to work on them?


Thanks,
   J
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