Help please... More problems with USB 3.0 (kernel freezes)

[Hans Petter Selasky]

Hi,

On 03/18/13 23:39, Ronald F. Guilmette wrote:
> 1)  What is the best way to debug this?  I have seen HPS suggest to others
> with USB problems that they either (a) use the usbdump(8) command to get
> more info about the problems or else (b) compile and install a new kernel
> in which the option USB_DEBUG has been defined.  Which should I do, and
> how may I interpret the results in either case?

I see two kind of hangs:

1) IRQ is spinning
2) DMA is going wild in the memory

In sys/dev/usb/controller/xhci.c there are debug prints, DPRINTF() and 
DPRINTFN(). You probably want to have a print in the interrupt routine. 
Just search for "interrupt". Debug level is controlled via sysctl 
hw.usb.xhci.debug=X

>
> 2)  What are the command timeouts set to in the XHCI driver and how can I
>      increase them?  (Perhaps my card is just barely meeting the published
>      USB standard timing specs, and just need a tiny bit more time?)

The XHCI is an active USB controller. That means many high-level USB 
commands must be fed into it using separate commands. These have nothing 
to do with what is transferred to the USB device.

>
> 3)  What exactly is "hw.usb.no_cs_fail" ?

This just instructs the system to not re-enumerate the device on 
repeated clear stall failures.

>
> 4)  What exactly is "hw.usb.u3g.debug" ?

That's debugging for u3g driver module.

>
> 5)  What exactly is "diveration" ?

Where did you find this?

--HPS