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

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Date:	Tue, 09 Dec 2008 10:24:47 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb <linux-usb@...r.kernel.org>,
	Ian Jackson <Ian.Jackson@...citrix.com>
Subject: Re: Oops in UHCI when encountering "host controller process error"

Alan Stern wrote:
> The hardware starts running right at the end of uhci_start(), in the
> call to start_rh().  However according to those debugging lines you
> added to uhci_alloc_qh(), the DMA pool allocations are all messed up.  
> Those initial allocations all occur within uhci_start(), in the
>
> 	for (i = 0; i < UHCI_NUM_SKELQH; ++i)
>
> loop.  It sure looks like the DMA pool memory management needs 
> attention.
>
>   

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


Thanks,
    J
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