On 2023/7/25 1:22, Jason Gunthorpe wrote:
This callback requests the driver to create only a __IOMMU_DOMAIN_PAGING domain, so it saves a few lines in a lot of drivers needlessly checking the type. More critically, this allows us to sweep out all the IOMMU_DOMAIN_UNMANAGED and IOMMU_DOMAIN_DMA checks from a lot of the drivers, simplifying what is going on in the code and ultimately removing the now-unused special cases in drivers where they did not support IOMMU_DOMAIN_DMA. domain_alloc_paging() should return a struct iommu_domain that is functionally compatible with ARM_DMA_USE_IOMMU, dma-iommu.c and iommufd. Be forwards looking and pass in a 'struct device *' argument. We can provide this when allocating the default_domain. No drivers will look at this. 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 | 13 ++++++++++--- include/linux/iommu.h | 3 +++ 2 files changed, 13 insertions(+), 3 deletions(-)
Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
