When SWIOTLB_NO_FORCE is used, there should really be no allocations of
default_nslabs to occur since we are not going to use those slabs. If a
platform was somehow setting swiotlb_no_force and a later call to
swiotlb_init() was to be made we would still be proceeding with
allocating the default
Hi,
After Hector's initial work [1] to bring up Linux on Apple's M1 it's time to
bring up more devices. Most peripherals connected to the SoC are behind a iommu
which Apple calls "Device Address Resolution Table", or DART for short [2].
Unfortunately, it only shares the name with PowerPC's DART.
Apple's new SoCs use iommus for almost all peripherals. These Device
Address Resolution Tables must be setup before these peripherals can
act as DMA masters.
Signed-off-by: Sven Peter
---
MAINTAINERS | 1 +
drivers/iommu/Kconfig| 13 +
drivers/iommu/Makefile
Apple's DART iommu uses a pagetable format that's very similar to the ones
already implemented by io-pgtable.c.
Add a new format variant to support the required differences.
Signed-off-by: Sven Peter
---
drivers/iommu/Kconfig | 13 +++
drivers/iommu/io-pgtable-arm.c | 70
DART (Device Address Resolution Table) is the iommu found on Apple
ARM SoCs such as the M1.
Signed-off-by: Sven Peter
---
.../bindings/iommu/apple,t8103-dart.yaml | 82 +++
MAINTAINERS | 6 ++
2 files changed, 88 insertions(+)
create mode
