linux-kernel - Re: [RFC 4/7] soc: qcom: Add Shared Memory Manager driver

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Message-ID: <20141028003424.GP28611@sonymobile.com>
Date:	Mon, 27 Oct 2014 17:34:26 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Jeffrey Hugo <jhugo@...eaurora.org>
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@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <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>,
	Suman Anna <s-anna@...com>
Subject: Re: [RFC 4/7] soc: qcom: Add Shared Memory Manager driver

On Wed 08 Oct 14:33 PDT 2014, Jeffrey Hugo wrote:

[..]
> > + */
> > +struct smem_header {
> > +     struct smem_proc_comm proc_comm[4];
> > +     u32 version[32];
> > +     u32 smem_initialized;
> > +     u32 free_offset;
> > +     u32 available;
> > +     u32 unused;
> 
> I see that you inlined the smem_heap_info struct.  That is slightly
> problematic since we have some uses of that structure, and without it,
> accessing id 1 becomes complicated.  I would prefer you reintroduce it.
> 

Could you help me better understand what you mean here? I've scanned through
msm-3.4 and msm-3.10 and read your comment numerous times, but I can't find any
uses that needs it nor figure out why it would be difficult to access item 1.

> > +     struct smem_entry toc[SMEM_MAX_ITEMS];
> > +};

Thanks,
Bjorn
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