Re: [PATCH v2 4/7] irqchip: Have CONFIG_IRQ_MSI_IOMMU be selected by irqchips that need it

[Jason Gunthorpe]

> --- a/drivers/iommu/Kconfig
> +++ b/drivers/iommu/Kconfig
> @@ -154,7 +154,6 @@ config IOMMU_DMA
>  	select DMA_OPS_HELPERS
>  	select IOMMU_API
>  	select IOMMU_IOVA
> -	select IRQ_MSI_IOMMU
>  	select NEED_SG_DMA_LENGTH
>  	select NEED_SG_DMA_FLAGS if SWIOTLB

Because of the above this patch needs to add:

--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -449,8 +449,10 @@ void iommu_put_dma_cookie(struct iommu_domain *domain)
        struct iommu_dma_cookie *cookie = domain->iova_cookie;
        struct iommu_dma_msi_page *msi, *tmp;
 
+#if IS_ENABLED(CONFIG_IRQ_MSI_IOMMU)
        if (domain->sw_msi != iommu_dma_sw_msi)
                return;
+#endif
 
        if (!cookie)
                return;

I fixed it up

I think the above if can be deleted with the sketch I showed in the
last email since the put_dma_cookie will only ever be called on the
default domain or on the vfio domain which guarantees it is not
iommufd or something else using the union.

Jason