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RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue available space

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> > At last, comparing with the FIFO/Queue info, I think software transfer
> > Requests list, TRBs info, EVENTs history are much more useful for
> debugging
> > the driver. If you can also add these info to each EP folder, that is awesome!
> > :)
> 
> I'll think about adding these but for the lifetime of requests and trbs
> and events, etc, we have tracepoints for that. I usually do the
> following when debugging:
> 
> # mount -t debugfs none /sys/kernel/debug
> # cd /sys/kernel/debug/tracing
> # echo 2048 > buffer_size_kb
> # echo 1 > events/dwc3/enable
> 
> (do something to break it)
> 
> # cp trace /mnt/sdcard # or something like that
> 
> then read the file. You can make it as large or as small as you like
> (given some constraints, of course ;-) but I've had no issues allocating
> 128MiB in the past.
> 
> --
> Balbi

Thanks for the sharing, this is a good approach to capture dynamic
behaviors. But a dump of current state has below advantages:
1. a quick view for the pending transfers. Then we can quickly 
     checking the transfer status.
2. no side-effect. This is important in some case. We usually
    encounter some transfer issues but very hard to reproduce
    it. But we cannot enable trace all the time since performance
    concern. Then I thought it was so great if I can have a look for
    the trb status. :)

Best Regards,
Du, Changbin

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[PATCH] usb: dwc3: add debugfs node to dump FIFO/Queue available space changbin.du@intel.com - 2016-04-06 10:40 +0200
  Re: [PATCH] usb: dwc3: add debugfs node to dump FIFO/Queue available  space Greg KH <gregkh@linuxfoundation.org> - 2016-04-06 11:30 +0200
    RE: [PATCH] usb: dwc3: add debugfs node to dump FIFO/Queue  available space "Du, Changbin" <changbin.du@intel.com> - 2016-04-06 13:40 +0200
      RE: [PATCH] usb: dwc3: add debugfs node to dump FIFO/Queue available space Felipe Balbi <balbi@kernel.org> - 2016-04-06 14:30 +0200
    [PATCH v2 0/3] Improvement, fix and new entry for dwc3 debugfs changbin.du@intel.com - 2016-04-06 18:00 +0200
      [PATCH v2 3/3] usb: dwc3: add debugfs node to dump FIFO/Queue available space changbin.du@intel.com - 2016-04-06 18:00 +0200
      Re: [PATCH v2 0/3] Improvement, fix and new entry for dwc3 debugfs Felipe Balbi <balbi@kernel.org> - 2016-04-07 07:10 +0200
        RE: [PATCH v2 0/3] Improvement, fix and new entry for dwc3 debugfs "Du, Changbin" <changbin.du@intel.com> - 2016-04-07 07:30 +0200
          RE: [PATCH v2 0/3] Improvement, fix and new entry for dwc3 debugfs Felipe Balbi <balbi@kernel.org> - 2016-04-07 07:30 +0200
        [PATCH v3 0/2] Add a new debugfs entry to dump FIFO/Queue available space changbin.du@intel.com - 2016-04-08 11:50 +0200
          [PATCH v3 1/2] usb: dwc3: make dwc3_debugfs_init return value be void changbin.du@intel.com - 2016-04-08 11:50 +0200
            Re: [PATCH v3 1/2] usb: dwc3: make dwc3_debugfs_init return value be void Felipe Balbi <balbi@kernel.org> - 2016-04-11 10:20 +0200
              RE: [PATCH v3 1/2] usb: dwc3: make dwc3_debugfs_init return value  be void "Du, Changbin" <changbin.du@intel.com> - 2016-04-11 13:20 +0200
                RE: [PATCH v3 1/2] usb: dwc3: make dwc3_debugfs_init return value be void Felipe Balbi <balbi@kernel.org> - 2016-04-11 13:30 +0200
                [PATCH v4 0/2] Add a new debugfs entry to dump FIFO/Queue available space changbin.du@intel.com - 2016-04-12 13:30 +0200
                [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue available space changbin.du@intel.com - 2016-04-12 13:30 +0200
                Re: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue  available space Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-04-12 15:00 +0200
                RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue  available space "Du, Changbin" <changbin.du@intel.com> - 2016-04-14 05:30 +0200
                Re: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue available space Felipe Balbi <balbi@kernel.org> - 2016-04-14 10:10 +0200
                RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue  available space "Du, Changbin" <changbin.du@intel.com> - 2016-04-14 13:20 +0200
                RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue available space Felipe Balbi <balbi@kernel.org> - 2016-04-14 13:30 +0200
                RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue  available space "Du, Changbin" <changbin.du@intel.com> - 2016-04-14 13:40 +0200
                RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue available space Felipe Balbi <balbi@kernel.org> - 2016-04-14 13:50 +0200
                RE: [PATCH v4 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue  available space "Du, Changbin" <changbin.du@intel.com> - 2016-04-14 14:00 +0200
                [PATCH v4 1/2] usb: dwc3: make dwc3_debugfs_init return value be void changbin.du@intel.com - 2016-04-12 13:30 +0200
          [PATCH v3 2/2] usb: dwc3: add debugfs node to dump FIFO/Queue available space changbin.du@intel.com - 2016-04-08 11:50 +0200

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