linux-kernel - Re: [PATCH v7 11/12] firmware: qcom: scm: clarify the comment in qcom_scm_pas_init

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Message-ID: <qwzpjymdu7svm2ojehnbyztcnbgvpqakj3rmhfzjwf2mld6w6u@zj3qrcza5hf6>
Date: Sat, 16 Mar 2024 12:27:00 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Prasad Sodagudi <quic_psodagud@...cinc.com>
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Andy Gross <agross@...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>, Maximilian Luz <luzmaximilian@...il.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>, Deepti Jaggi <quic_djaggi@...cinc.com>
Subject: Re: [PATCH v7 11/12] firmware: qcom: scm: clarify the comment in
 qcom_scm_pas_init_image()

On Fri, Mar 01, 2024 at 10:49:57AM -0800, Prasad Sodagudi wrote:
> On 2/17/2024 7:50 PM, Bjorn Andersson wrote:
> > On Mon, Feb 05, 2024 at 07:28:09PM +0100, Bartosz Golaszewski wrote:
> > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
[..]
> > > +	 * If we pass a buffer that is already part of an SHM Bridge to this
> > > +	 * call, it will fail.
> > Could this be because the consumer of this buffer operates in EL2, and
> > not TZ?
> These buffers are consumed by TZ only and not by EL2.  hyp creating the
> required bridges for pil buffers.

Please help Bartosz document what is actually going on here and why
these buffers should be handled differently.

Regards,
Bjorn