linux-kernel - Re: [PATCH v7 2/2] remoteproc: qcom: Use of_reserved_mem_region

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Message-ID: <CAEnQRZDBZ52FoNRBJa1qScbkcEYKwbyP_ephutdkYFaY5b1yLw@mail.gmail.com>
Date: Tue, 9 Dec 2025 16:20:03 +0200
From: Daniel Baluta <daniel.baluta@...il.com>
To: Rob Herring <robh@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>, Bjorn Andersson <andersson@...nel.org>, 
	Mathieu Poirier <mathieu.poirier@...aro.org>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Magnus Damm <magnus.damm@...il.com>, Patrice Chotard <patrice.chotard@...s.st.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>, Peng Fan <peng.fan@....com>, 
	Beleswar Padhi <b-padhi@...com>, linux-remoteproc@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v7 2/2] remoteproc: qcom: Use of_reserved_mem_region_*
 functions for "memory-region"

> Other platforms (non-QCom) were tested also use
> devm_ioremap_resource_wc(). So something else is claiming the same
> region? Can you dump out /proc/iomem?
>
> The region is dynamically allocated, so maybe that has something to do with it.

We noticed a related issue with imx_dsp_rproc.

Because:
imx_dsp_rproc_prepare:
 -> imx_dsp_rproc_add_carveout
     -> /*... */ and this calls devm_ioremap_resource_wc
-> pm_runtime_get_sync

imx_dsp_rproc_unprepare:
 ->pm_runtime_put_sync

There is no easy way to manually undo devm_ioremap_resource_wc so I have
sent a patch to use devm_ioremap_wc.

https://lore.kernel.org/imx/20251209140425.766742-1-daniel.baluta@nxp.com/T/#u

In your case Marek at least you need to understand which driver
reserves    8dc00000-8e7fffff : reserved and why.

thanks,
Daniel.