linux-kernel - Re: [RFC 5/7] soc: qcom: Add Shared Memory Driver

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Message-ID: <20141030150429.GX28611@sonymobile.com>
Date:	Thu, 30 Oct 2014 08:04:31 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Ohad Ben-Cohen <ohad@...ery.com>
CC:	Kumar Gala <galak@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Kevin Hilman <khilman@...prootsystems.com>
Subject: Re: [RFC 5/7] soc: qcom: Add Shared Memory Driver

On Thu 30 Oct 06:34 PDT 2014, Ohad Ben-Cohen wrote:

> Hi Bjorn,
> 
> On Thu, Oct 30, 2014 at 2:38 AM, Bjorn Andersson
> <bjorn.andersson@...ymobile.com> wrote:
> > My concern is that merging SMD into rpmsg will still give us two different
> > solutions, except that they will be deeply tangled.
> 
> I agree.
> 
> It's very clear that SMD and rpmsg are different. But fundamentally,
> they do exactly the same: new messages are placed in a ring buffer and
> then an interrupt is triggered.
> 
> If Qualcomm wanted to adopt rpmsg I'm confident there would have been
> no technical barriers to do so.
> 

Their wish list seems long, but I think you're right :)

> But given that SMD is not going anywhere, I personally hope that you
> could at least avoid having two different implementations of it merged
> upstream.
> 

Looking at the lack of functionality in mach-msm it seems like it's quite a lot
of work getting to a point where anyone could actually test smd on those devices.

If anyone have any input on how I get a piece of user space that will run with
mainline and communicate with the modem to test this I'm happily listening.

Regards,
Bjorn
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