[PATCH v3 0/3] Replace private domain with per-group default domain

From: Lu Baolu
Date: Thu Apr 16 2020 - 02:28:04 EST


Some devices are required to use a specific type (identity or dma)
of default domain when they are used with a vendor iommu. When the
system level default domain type is different from it, the vendor
iommu driver has to request a new default domain with either
iommu_request_dma_domain_for_dev() or iommu_request_dm_for_dev()
in the add_dev() callback. Unfortunately, these two helpers only
work when the group hasn't been assigned to any other devices,
hence, some vendor iommu driver has to use a private domain if
it fails to request a new default one.

Joerg proposed an on-going proposal which makes the default domain
framework to support configuring per-group default domain during
boot process.

https://lkml.org/lkml/2020/4/14/616

Hence, there is no need to keep the private domain implementation
in the Intel IOMMU driver. This patch series aims to remove it.

Best regards,
baolu

Change log:
v2->v3:
- Port necessary patches on the top of Joerg's new proposal.
https://lkml.org/lkml/2020/4/14/616
The per-group default domain proposed previously in this series
will be deprecated due to a race concern between domain switching
and device driver probing.

v1->v2:
- Rename the iommu ops callback to def_domain_type

Lu Baolu (3):
iommu/vt-d: Allow 32bit devices to uses DMA domain
iommu/vt-d: Allow PCI sub-hierarchy to use DMA domain
iommu/vt-d: Apply per-device dma_ops

drivers/iommu/intel-iommu.c | 396 +++---------------------------------
1 file changed, 26 insertions(+), 370 deletions(-)

--
2.17.1