linux-kernel - Re: [PATCH v2 4/4] remoteproc: Use of_reserved_mem_region

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Message-ID: <CAL_JsqKhjE-67k2jN3x5qjRYbT4100fDCfkpt7TjESgOi_f8sA@mail.gmail.com>
Date: Fri, 2 May 2025 15:33:12 -0500
From: Rob Herring <robh@...nel.org>
To: tanmay.shah@....com
Cc: Saravana Kannan <saravanak@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	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>, 
	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>, Chen-Yu Tsai <wens@...nel.org>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-remoteproc@...r.kernel.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH v2 4/4] remoteproc: Use of_reserved_mem_region_* functions
 for "memory-region"

On Fri, May 2, 2025 at 10:40 AM Tanmay Shah <tanmay.shah@....com> wrote:
>
>
> Hello Rob,
>
> Thanks for the patch. Please find my comments below.
>
>
> On 4/23/25 2:42 PM, Rob Herring (Arm) wrote:
> > Use the newly added of_reserved_mem_region_to_resource() and
> > of_reserved_mem_region_count() functions to handle "memory-region"
> > properties.
> >
> > The error handling is a bit different in some cases. Often
> > "memory-region" is optional, so failed lookup is not an error. But then
> > an error in of_reserved_mem_lookup() is treated as an error. However,
> > that distinction is not really important. Either the region is available
> > and usable or it is not. So now, it is just
> > of_reserved_mem_region_to_resource() which is checked for an error.
> >
> > Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> > ---
> > v2:
> >   - Use strstarts instead of strcmp for resource names as they include
> >     the unit-address.
> >   - Drop the unit-address from resource name for imx and st drivers
> > ---
> >   drivers/remoteproc/imx_dsp_rproc.c        | 45 ++++++++------------
> >   drivers/remoteproc/imx_rproc.c            | 68 ++++++++++++------------------
> >   drivers/remoteproc/qcom_q6v5_adsp.c       | 24 ++++-------
> >   drivers/remoteproc/qcom_q6v5_mss.c        | 60 +++++++++------------------
> >   drivers/remoteproc/qcom_q6v5_pas.c        | 69 +++++++++++--------------------
> >   drivers/remoteproc/qcom_q6v5_wcss.c       | 25 +++++------
> >   drivers/remoteproc/qcom_wcnss.c           | 23 ++++-------
> >   drivers/remoteproc/rcar_rproc.c           | 36 +++++++---------
> >   drivers/remoteproc/st_remoteproc.c        | 41 +++++++++---------
> >   drivers/remoteproc/stm32_rproc.c          | 44 +++++++++-----------
> >   drivers/remoteproc/ti_k3_dsp_remoteproc.c | 28 +++++--------
> >   drivers/remoteproc/ti_k3_m4_remoteproc.c  | 28 +++++--------
> >   drivers/remoteproc/ti_k3_r5_remoteproc.c  | 28 +++++--------
> >   drivers/remoteproc/xlnx_r5_remoteproc.c   | 51 +++++++++--------------
> >   14 files changed, 221 insertions(+), 349 deletions(-)
> >
> > diff --git a/drivers/remoteproc/imx_dsp_rproc.c b/drivers/remoteproc/imx_dsp_rproc.c
> > index 90cb1fc13e71..fffae6ff4a5c 100644
>
> [ ... ]
>
> > diff --git a/drivers/remoteproc/xlnx_r5_remoteproc.c b/drivers/remoteproc/xlnx_r5_remoteproc.c
> > index 5aeedeaf3c41..b73e97074c01 100644
> > --- a/drivers/remoteproc/xlnx_r5_remoteproc.c
> > +++ b/drivers/remoteproc/xlnx_r5_remoteproc.c
> > @@ -460,49 +460,44 @@ static int add_mem_regions_carveout(struct rproc *rproc)
> >   {
> >       struct rproc_mem_entry *rproc_mem;
> >       struct zynqmp_r5_core *r5_core;
> > -     struct of_phandle_iterator it;
> > -     struct reserved_mem *rmem;
> >       int i = 0;
> >
> >       r5_core = rproc->priv;
> >
> >       /* Register associated reserved memory regions */
> > -     of_phandle_iterator_init(&it, r5_core->np, "memory-region", NULL, 0);
> > +     while (1) {
> > +             int err;
> > +             struct resource res;
> >
> > -     while (of_phandle_iterator_next(&it) == 0) {
> > -             rmem = of_reserved_mem_lookup(it.node);
> > -             if (!rmem) {
> > -                     of_node_put(it.node);
> > -                     dev_err(&rproc->dev, "unable to acquire memory-region\n");
> > -                     return -EINVAL;
> > -             }
> > +             err = of_reserved_mem_region_to_resource(r5_core->np, i++, &res);
>
> Here i++ is not needed as it's done at the end of the loop.
> This bug breaks RPMsg communication on zynqmp platform.

Thanks for debugging it. I'll fix that up.

Rob