linux-kernel - Re: [PATCH v9 00/13] firmware: qcom: qseecom: convert to using the TZ allocator

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Date: Wed, 3 Apr 2024 09:47:14 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Maximilian Luz <luzmaximilian@...il.com>
Cc: Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Elliot Berman <quic_eberman@...cinc.com>, 
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
	Guru Das Srinagesh <quic_gurus@...cinc.com>, Andrew Halaney <ahalaney@...hat.com>, 
	Alex Elder <elder@...aro.org>, Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, kernel@...cinc.com, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v9 00/13] firmware: qcom: qseecom: convert to using the TZ allocator

On Tue, Apr 2, 2024 at 10:44 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> On Sat, Mar 30, 2024 at 8:16 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > On Fri, 29 Mar 2024 20:57:52 +0100, Maximilian Luz <luzmaximilian@...ilcom> said:
> > > On 3/29/24 8:46 PM, Bartosz Golaszewski wrote:
> > >> On Fri, 29 Mar 2024 at 20:39, Maximilian Luz <luzmaximilian@...il.com> wrote:
> > >>>
> > >>> On 3/29/24 8:26 PM, Bartosz Golaszewski wrote:
> > >>>> On Fri, 29 Mar 2024 at 20:22, Maximilian Luz <luzmaximilian@...il.com> wrote:
> > >>>>>
> > >>>>> On 3/29/24 8:07 PM, Bartosz Golaszewski wrote:
> > >>>>>>
> > >>>>>> Both with and without SHM bridge?
> > >>>>>
> > >>>>> With CONFIG_QCOM_TZMEM_MODE_GENERIC=y (and the upcoming fix) everything
> > >>>>> works. With CONFIG_QCOM_TZMEM_MODE_SHMBRIDGE=y things unfortunately
> > >>>>> still get stuck at boot (regardless of the fix). I think that's
> > >>>>> happening even before anything efivar related should come up.
> > >>>>>
> > >>>>
> > >>>> This is on X13s? I will get one in 3 weeks. Can you get the bootlog
> > >>>> somehow? Does the laptop have any serial console?
> > >>>
> > >>> Surface Pro X (sc8180x), but it should be similar enough to the X13s in
> > >>> that regard. At least from what people with access to the X13s told me,
> > >>> the qseecom stuff seems to behave the same.
> > >>>
> > >>> Unfortunately I don't have a direct serial console. Best I have is
> > >>> USB-serial, but it's not even getting there. I'll have to try and see if
> > >>> I can get some more info on the screen.
> > >>>
> > >>
> > >> I have access to a sc8180x-primus board, does it make sense to test
> > >> with this one? If so, could you give me instructions on how to do it?
> > >
> > > I guess it's worth a shot.
> > >
> > >  From what I can tell, there shouldn't be any patches in my tree that
> > > would conflict with it. So I guess it should just be building it with
> > > CONFIG_QCOM_TZMEM_MODE_SHMBRIDGE=y and booting.
> > >
> > > I am currently testing it on top of a patched v6.8 tree though (but that
> > > should just contain patches to get the Pro X running). You can find the
> > > full tree at
> > >
> > >      https://github.com/linux-surface/kernel/tree/spx/v6.8
> > >
> > > The last commit is the fix I mentioned, so you might want to revert
> > > that, since the shmem issue triggers regardless of that and it prevents
> > > your series from applying cleanly.
> > >
> > > Best regards,
> > > Max
> > >
> >
> > sc8180x-primus' support upstream is quite flaky. The board boots 50% of time.
> > However it's true that with SHM bridge it gets to:
> >
> > mount: mounting efivarfs on /sys/firmware/efi/efivars failed: Operation not supported
> >
> > and stops 100% of the time. Without SHM bridge I cannot boot it either because
> > I suppose I need the patch you sent yesterday. I haven't had the time to
> > rebase it yet, it's quite intrusive to my series.
> >
> > I can confirm that with that patch the board still boots but still 50% of the
> > time.
> >
> > Bart
>
> Hi!
>
> I was under the impression that until v8, the series worked on sc8180x
> but I'm seeing that even v7 has the same issue with SHM Bridge on
> sc8180x-primus. Could you confirm? Because I'm not sure if I should
> track the differences or the whole thing was broken for this platform
> from the beginning.
>
> Bart

Interestingly, it doesn't seem like a problem with qseecom - even if I
disable the driver, the board still freezes after the first SCM call
using SHM bridge. I suspect - and am trying to clarify that with qcom
- that this architecture doesn't support SHM bridge but doesn't report
it either unlike other older platforms. Or maybe there's some quirk
somewhere. Anyway, I'm on it.

Bart