Re: [Xen-devel] xHCI not waking up from D3 after S3 Resume on Ivybridge

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

>>>>
>>>> Does the xHCI host work fine without Xen?  I.e. running Linux directly
>>>> as the host OS, suspending, resuming, and then plugging in a device?
>>>
>>> It works in Ubuntu 12.04 Beta 1 with Linux 3.2.0. So it's either broken 
>>> between 3.2.0 and 3.2.5 or it's broken in Xen. I haven't made a direct 
>>> comparison yet. I'm putting Ubuntu on my SDP now to test that.
>>
>> xHCI wakes up from D3 on the SDP with Ubuntu 12.04 Beta 1 and 3.2.11. This 
>> fails with the same 3.2.11 kernel and Xen. So the problem is Xen related.


>
> Another update.
>
> On the Ivybridge laptop, xHCI is not waking up because when I plug a device 
> into a xHCI port the ACPI wakeup events are going to the e1000e. Pre S3, it 
> eventually gets a interrupt from the device that wakes it up. Post S3 it 
> never gets an interrupt from the device.

So these are all MSI related issues right. The e1000e is also MSI? In
other words the issues you are having is that the MSI after resume are
not delivered - but some are ?

If you print out the MSI vector table (from xen) before and resume are
the vectors the same? Is there a pending bit set on the one that are
not woken up?

>
> On the SDP, I get ACPI wake up calls for the xHCI before S3, but not after. 
> Both cases work with out Xen. I'm assuming Xen/PVOPs is leaving the device in 
> a state the causes the ACPI wake up events to be masked. Can you tell me what 
> what state that could be? I can look at decompiling the ASL to find out, but 
> that's not my first choice. Toggling the power policy (auto->on->auto) does 
> not fix delivery of ACPI wake up events for this device. I am still getting 
> ACPI wake ups for the e1000e, so it's not all wake ups that are blocked.
>
> Thanks for any help.
>
> -Tom
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>

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