iommu/vt-d: Check whether device requires bounce buffer

This adds a helper to check whether a device needs to
use bounce buffer. It also provides a boot time option
to disable the bounce buffer. Users can use this to
prevent the iommu driver from using the bounce buffer
for performance gain.

Cc: Ashok Raj <[email protected]>
Cc: Jacob Pan <[email protected]>
Cc: Kevin Tian <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
Tested-by: Xu Pengfei <[email protected]>
Tested-by: Mika Westerberg <[email protected]>
Signed-off-by: Joerg Roedel <[email protected]>

0 files changed, 0 insertions, 0 deletions