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

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Date:	Fri, 13 Mar 2015 18:35:39 -0500
From:	Suman Anna <s-anna@...com>
To:	Ohad Ben-Cohen <ohad@...ery.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 03/12/2015 04:04 AM, Ohad Ben-Cohen wrote:
> 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. Can you pick up the minor checkpatch fixes I posted as well
for 4.1?

regards
Suman
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