lkml.org 
[lkml]   [2017]   [Sep]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 2/2] iommu/omap: Add support to program multiple iommus
Hi Suman,

On Thu, Aug 31, 2017 at 08:14:02AM -0500, Suman Anna wrote:
> The OMAP IOMMU driver has been enhanced to support allowing
> multiple IOMMUs to be programmed by a single client user. This
> support is being added mainly to handle the DSP subsystems on
> the DRA7xx SoCs, which have two MMUs within the same subsystem.
> These MMUs provide translations to a processor core port and
> an internal EDMA port. This support allows both the MMUs to
> be programmed together, but with each one retaining it's own
> internal state objects. The internal EDMA is managed by the
> software running on the DSPs, and this design provides on-par
> functionality with previous generation OMAP DSPs where the
> EDMA and the DSP core shared the same MMU.

I didn't get that from the review, so a question here: Do both MMUs show
show up in sysfs, means, do you register both of them the the core code?

Because I think with the solution implemented here, only a single,
combined MMU should be visible to iommu core code and in sysfs.


Regards,

Joerg

\
 
 \ /
  Last update: 2017-09-01 12:02    [W:0.048 / U:0.040 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site