On Wed, Feb 19 2025 at 17:31, Nicolin Chen wrote:
> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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
