linux-kernel - Re: [PATCH 1/7] remoteproc: resource table overhaul

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Message-ID: <CAK=WgbYSrzTKW-QME4-r6XhVAQL0b6iWyus632KZOpfpTPgwWg@mail.gmail.com>
Date:	Tue, 22 May 2012 11:02:14 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Michal Simek <monstr@...str.eu>
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Brian Swetland <swetland@...gle.com>,
	Iliyan Malchev <malchev@...gle.com>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mark Grosen <mgrosen@...com>,
	John Williams <john.williams@...alogix.com>,
	Loic PALLARDY <loic.pallardy@...ricsson.com>,
	Ludovic BARRE <ludovic.barre@...ricsson.com>,
	Omar Ramirez Luna <omar.luna@...aro.org>,
	Guzman Lugo Fernando <fernando.lugo@...com>,
	Anna Suman <s-anna@...com>, Clark Rob <rob@...com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	Kieran Bingham <kieranbingham@...il.com>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH 1/7] remoteproc: resource table overhaul

Hi Michal,

On Tue, May 22, 2012 at 8:51 AM, Michal Simek <monstr@...str.eu> wrote:
> Simple enabling RSC_VDEV in rproc_handle_rsc doesn't work.

Sure - you'll need to actually plug the vrings allocation code there,
too (i.e. this requires some coding, it's not a 1-liner).

> BTW: I am using kernel modules and there is no dependency for
> virtio_rpmsg_bus in remoteproc module
> in sense if you load remoteproc module you also need to load
> virtio_rpmsg_bus to get firmware to work.

This is expected: remoteproc only provides means for booting and
controlling remote processors and it doesn't boot them upfront.

To actually boot a remote processor, and do something useful with it,
one needs to load a module which utilizes remoteproc's API (e.g.
virtio_rpmsg_bus, but YMMV).

> ~ # lsmod
> ~ # modprobe zynq_remoteproc
> zynq_remoteproc: Unknown symbol rproc_register (err 0)
> zynq_remoteproc: Unknown symbol rproc_alloc (err 0)
> zynq_remoteproc: Unknown symbol rproc_vq_interrupt (err 0)
> zynq_remoteproc: Unknown symbol rproc_free (err 0)
> zynq_remoteproc: Unknown symbol rproc_unregister (err 0)

We don't have these errors - have you tried looking into them ?

Btw do you plan on submitting the code for zynq_remoteproc ?

> Can you see the same behavior on omap?

Except the "Unknown symbol" errors, everything else looks good.

Thanks,
Ohad.
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