On Monday 01 September 2014 12:47:08 Marek Szyprowski wrote:
I don't completely understand it yet. I would assume the deviceWho do you think needs to set this flag, and who needs to read it?In the proposed solution Exynos IOMMU driver creates a separate IO
address space
for every client device in a system and binds it to the default
dma-mapping space
for the given device. When drivers are doing its own management of IO
address
space, instead of relying on what is available by default with dma-mapping
interface, this will require releasing of the previously created default
structures and resources. So this flag is set by the driver doing its own
management of io address space. The flags is then checked by Exynos
IOMMU driver
to avoid creating the default dma-mapping address space for devices
which driver
does its own management.
to be added to the default domain at device creation time
(of_platform_populate), way before we know which device driver
is going to be used. How can this prevent the iommu driver
from doing the association with the domain?