linux-kernel - Re: [PATCH v3 1/2] remoteproc: use a flag to detect the presence of IOMMU

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Date:	Thu, 12 Mar 2015 11:04:03 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Suman Anna <s-anna@...com>
Cc:	Dave Gerlach <d-gerlach@...com>, Robert Tivy <rtivy@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 1/2] remoteproc: use a flag to detect the presence of IOMMU

On Fri, Jan 9, 2015 at 11:21 PM, Suman Anna <s-anna@...com> wrote:
> The remoteproc driver core currently relies on iommu_present() on
> the bus the device is on, to perform MMU management. However, this
> logic doesn't scale for multi-arch, especially for processors that
> do not have an IOMMU. Replace this logic instead by using a h/w
> capability flag for the presence of IOMMU in the rproc structure.
>
> This issue is seen on OMAP platforms when trying to add a remoteproc
> driver for a small Cortex M3 called the WkupM3 used for suspend /
> resume management on TI AM335/AM437x SoCs. This processor does not
> have an MMU. Same is the case with another processor subsystem
> PRU-ICSS on AM335/AM437x. All these are platform devices, and the
> current iommu_present check will not scale for the same kernel image
> to support OMAP4/OMAP5 and AM335/AM437x.
>
> The existing platform implementation drivers - OMAP remoteproc, STE
> Modem remoteproc and DA8xx remoteproc, are updated as well to properly
> configure the newly added rproc field.
>
> Cc: Robert Tivy <rtivy@...com>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Suman Anna <s-anna@...com>

Applied to remoteproc's for-next branch.

Thanks,
Ohad.
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