linux-kernel - Re: [PATCH 2/3] iommu/ipmmu-vmsa: Increase maximum micro-TLBS to 48

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Message-ID: <d09728bb-2a46-e050-3525-757858c17295@cogentembedded.com>
Date:	Tue, 7 Jun 2016 13:59:56 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Magnus Damm <magnus.damm@...il.com>,
	iommu@...ts.linux-foundation.org
Cc:	laurent.pinchart+renesas@...asonboard.com, geert+renesas@...der.be,
	joro@...tes.org, linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, horms+renesas@...ge.net.au
Subject: Re: [PATCH 2/3] iommu/ipmmu-vmsa: Increase maximum micro-TLBS to 48

Hello.

On 6/7/2016 6:39 AM, Magnus Damm wrote:

> From: Magnus Damm <damm+renesas@...nsource.se>
>
> Bump up the maximum numbers of micro-TLBS to 48.
>
> Each IPMMU device instance get micro-TLB assignment via
> the "iommus" property in DT. Older SoCs tend to use a
> maximum number of 32 micro-TLBd per IPMMU instance however

    Micro-TLBs?

> newer SoCs such as r8a7796 make use of up to 48 micro-TLBs.
>
> At this point no SoC specific handling is done to validate
> the maximum number of micro-TLBs, and because of that the
> DT information is assumed to be within correct range for
> each particular SoC.
>
> If needed in the future SoC specific feature flags can be
> added to handle the maximum number of micro-TLBs without
> requiring DT changes, however at this point this does not
> seem necessary.
>
> Signed-off-by: Magnus Damm <damm+renesas@...nsource.se>
[...]

MBR, Sergei