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 makes more sense for the 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 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 --- drivers/iommu/Kconfig | 1 - drivers/irqchip/Kconfig | 4 ++++ kernel/irq/Kconfig | 1 + 3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index ec1b5e32b972..5124e7431fe3 100644 --- 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
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index be063bfb50c4..84015decc3a4 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -28,6 +28,7 @@ config ARM_GIC_V2M select ARM_GIC select IRQ_MSI_LIB select PCI_MSI + select IRQ_MSI_IOMMU
config GIC_NON_BANKED bool @@ -38,12 +39,14 @@ config ARM_GIC_V3 select PARTITION_PERCPU select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP select HAVE_ARM_SMCCC_DISCOVERY + select IRQ_MSI_IOMMU
config ARM_GIC_V3_ITS bool select GENERIC_MSI_IRQ select IRQ_MSI_LIB default ARM_GIC_V3 + select IRQ_MSI_IOMMU
config ARM_GIC_V3_ITS_FSL_MC bool @@ -407,6 +410,7 @@ config LS_EXTIRQ
config LS_SCFG_MSI def_bool y if SOC_LS1021A || ARCH_LAYERSCAPE + select IRQ_MSI_IOMMU depends on PCI_MSI
config PARTITION_PERCPU diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig index 5432418c0fea..9636aed20401 100644 --- a/kernel/irq/Kconfig +++ b/kernel/irq/Kconfig @@ -100,6 +100,7 @@ config GENERIC_MSI_IRQ bool select IRQ_DOMAIN_HIERARCHY
+# irqchip drivers should select this if they call iommu_dma_prepare_msi() config IRQ_MSI_IOMMU bool