On Wed, Feb 19 2025 at 17:31, Nicolin Chen wrote:
From: Jason Gunthorpe jgg@nvidia.com
Currently, IRQ_MSI_IOMMU is selected if DMA_IOMMU is available to provide an implementation for iommu_dma_prepare/compose_msi_msg(). However, it'll make more sense for irqchips that call prepare/compose to select it, and that will trigger all the additional code and data to be compiled into the kernel.
If IRQ_MSI_IOMMU is selected with no IOMMU side implementation, then the prepare/compose() will be NOP stubs.
If IRQ_MSI_IOMMU is not selected by an irqchip, then the related code on the iommu side is compiled out.
Signed-off-by: Jason Gunthorpe jgg@nvidia.com Signed-off-by: Nicolin Chen nicolinc@nvidia.com
Reviewed-by: Thomas Gleixner tglx@linutronix.de
I don't think I have conflicting changes here, so the MSI/IRQ related changes can be routed through the IOMMU tree along with the rest.
Thanks,
tglx