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SubjectRe: Oops in UHCI when encountering "host controller process error"
Jeremy Fitzhardinge wrote:
> Alan Stern wrote:
>> On Thu, 16 Oct 2008, Jeremy Fitzhardinge wrote:
>>
>>
>>> Looks like this is the relevent detail: "uhci->skelqh[1]->node.next
>>> is NULL" for all the queues. Haven't looked into it yet.
>>>
>>
>> Any news?
>
> The problem went away for a while, but then came back. I still have
> no idea why, but I'm back to debugging it.
>
> The most strange thing I'm seeing is this:
>
> uhci_hcd 0000:00:1d.0: irq 29, io base 0x0000bce0
> uhci_alloc_td uhci ffff88002e1a3d58 td ffff88002e105000 dma_handle
> 4ce2f000
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e106000 handle=4ce36000
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e106080 handle=4ce36080
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e106000 handle=4ce36000
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e106001
> handle=4ce36001 <<<
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e107000 handle=7e546000
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e107080 handle=7e546080
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e107000 handle=7e546000
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e107001
> handle=7e546001 <<<
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e108000 handle=7e22d000
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e108080 handle=7e22d080
> uhci_alloc_qh: uhci=ffff88002e1a3d58 qh=ffff88002e108000 handle=7e22d000
> usb usb1: configuration #1 chosen from 1 choice
> uhci_hcd 0000:00:1d.0: host controller process error, something bad
> happened!
> uhci_hcd 0000:00:1d.0: host controller halted, very bad!
> general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
>
>
> For some reason dma_pool_alloc() is returning unaligned, overlapping
> memory chunks. That that point everything else is no surprise...
>
> So I'm trying to figure out how the dma pool stuff is malfunctioning,
> and whether anything we've done is causing it.

On other runs the allocations turn out OK:

uhci_alloc_td: uhci ffff88002e631b08 td ffff88002e621000 dma_handle 4ce2f000
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622000 handle=4ce36000
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622080 handle=4ce36080
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622100 handle=4ce36100
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622180 handle=4ce36180
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622200 handle=4ce36200
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622280 handle=4ce36280
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622300 handle=4ce36300
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622380 handle=4ce36380
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622400 handle=4ce36400
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622000 handle=4ce36000
uhci_alloc_qh: uhci=ffff88002e631b08 qh=ffff88002e622000 handle=4ce36000

but the controller crashes and the structures seem to have been corrupted:

uhci_hcd 0000:00:1d.0: host controller process error, something bad happened!
uhci_hcd 0000:00:1d.0: host controller halted, very bad!
[lots of WARN_ONs I added about NULL qh->queue.nexts omitted ]
Root-hub state: running FSBR: 0
HC status
usbcmd = 00c0 Maxp64 CF
usbstat = 0020 HCHalted
usbint = 000f
usbfrnum = (0)000
flbaseadd = 7dd2b000
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
[ffff88002e622000] Skel QH link (4ce36002) element (00000000)
Element is NULL (bug?)
queue is empty
[ffff88002e621000] link (00000001) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f, PI
last QH not linked to next skeleton!
- skel_iso_qh
[ffff88002e622080] CTL QH link (00000000) element (00000000)
Element is NULL (bug?)
qh->queue.next == NULL
last QH not linked to next skeleton!
- skel_int128_qh
[ffff88002e622100] CTL QH link (4ce36002) element (00000000)
Element is NULL (bug?)
qh->queue.next == NULL
- skel_int64_qh
[ffff88002e622180] CTL QH link (4ce36002) element (00000000)
Element is NULL (bug?)
qh->queue.next == NULL
- skel_int32_qh
[ffff88002e622200] CTL QH link (4ce36002) element (00000000)
Element is NULL (bug?)
qh->queue.next == NULL
- skel_int16_qh
[ffff88002e622280] CTL QH link (4ce36002) element (00000000)
Element is NULL (bug?)
qh->queue.next == NULL
- skel_int8_qh
[ffff88002e622300] CTL QH link (4ce36002) element (00000000)
Element is NULL (bug?)
qh->queue.next == NULL
- skel_int4_qh
[ffff88002e622380] Skel QH link (4ce36002) element (00000001)
queue is empty
- skel_int2_qh
[ffff88002e622400] Skel QH link (4ce36002) element (00000001)
queue is empty
- skel_async_qh
[ffff88002e622000] Skel QH link (4ce36002) element (00000000)
Element is NULL (bug?)
queue is empty
[ffff88002e621000] link (00000001) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f, PI
last QH not linked to next skeleton!
- skel_term_qh
[ffff88002e622000] Skel QH link (4ce36002) element (00000000)
Element is NULL (bug?)
queue is empty
[ffff88002e621000] link (00000001) e0 Length=0 MaxLen=7ff DT0 EndPt=0 Dev=7f, PI

Any clues about what this means? Also, where's the best place to dump
all the structures before kicking off the hardware to make sure they're
correct from the outset?

Thanks,
J


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