linux-kernel - Re: More dwc3 gadget issues with adb

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 24 Apr 2020 11:36:24 -0700
From:   John Stultz <john.stultz@...aro.org>
To:     Jack Pham <jackp@...eaurora.org>
Cc:     Felipe Balbi <balbi@...nel.org>, Josh Gao <jmgao@...gle.com>,
        YongQin Liu <yongqin.liu@...aro.org>,
        Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>,
        Yang Fei <fei.yang@...el.com>,
        Thinh Nguyen <thinhn@...opsys.com>,
        Tejas Joglekar <tejas.joglekar@...opsys.com>,
        Andrzej Pietrasiewicz <andrzej.p@...labora.com>,
        Todd Kjos <tkjos@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: More dwc3 gadget issues with adb

On Fri, Apr 24, 2020 at 10:12 AM Jack Pham <jackp@...eaurora.org> wrote:
> On Tue, Apr 21, 2020 at 10:09:27PM -0700, John Stultz wrote:
> > Does something like this make sense? It's not causing trouble on
> > db845c either so far in my testing.
>
> Ok I'll bite...
>
> I'm now curious why it hasn't been a problem with the Qualcomm HW. Do
> you mind please capturing a similar trace log on the db845c?  Would be
> good to see a side-by-side comparison and see if, first of all, whether
> the same S/G path is getting exercised (i.e. 16KiB OUT requests from ADB
> userspace using AIO which then get broken up into 4K chunks by f_fs),
> and what the behaviors of the reclaim_trb and giveback are when the
> transfer is completed.
>
> Preferably if you could get a trace without your patch applied that
> would be great. And maybe also one after your patch just to see if the
> traces are truly identical or not.

Sure. I've captured logs in the same manner with and without on db845c
(against 5.7-rc2). See attached.

I suspect the difference is the db845c is using an iommu (I don't
think it will boot without it) where hikey960 isn't, but I'll let you
take a look.

thanks
-john

Download attachment "db845c.tar.xz" of type "application/octet-stream" (427484 bytes)