On 2023/7/25 1:21, Jason Gunthorpe wrote:
Except for dart every driver returns 0 or IDENTITY from def_domain_type(). The drivers that return IDENTITY have some kind of good reason, typically that quirky hardware really can't support anything other than IDENTITY. Arrange things so that if the driver says it needs IDENTITY then iommu_get_default_domain_type() either fails or returns IDENTITY. It will never reject the driver's override to IDENTITY. The only real functional difference is that the PCI untrusted flag is now ignored for quirky HW instead of overriding the IOMMU driver. This makes the next patch cleaner that wants to force IDENTITY always for ARM_IOMMU because there is no support for DMA. Tested-by: Steven Price<steven.price@xxxxxxx> Tested-by: Marek Szyprowski<m.szyprowski@xxxxxxxxxxx> Tested-by: Nicolin Chen<nicolinc@xxxxxxxxxx> Signed-off-by: Jason Gunthorpe<jgg@xxxxxxxxxx> --- drivers/iommu/iommu.c | 66 +++++++++++++++++++++---------------------- 1 file changed, 33 insertions(+), 33 deletions(-)
Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
