Hi Marek,
On Wed, Feb 17, 2016 at 03:42:54PM +0100, Marek Szyprowski wrote:
> From driver perspective the default_domains don't really differ from the
> 'other' domains. They are just allocated from the IOMMU core and used by
> the IOMMU/DMA-mapping glue code. That's what I got from reading the code.
>
> There should be also a way to detach the driver even from the default domain
> to implement the arch_tear_down_dma_ops function.
The attaching/detaching in the iommu-core only manages software state.
The iommu-driver can power-down the iommu device when the default-domain
is attached and it does not expect any map/unmap calls.
All it has to make sure is that it wakes up the iommu device again when
or before these calls are made again.
Joerg
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