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irqchip: Have CONFIG_IRQ_MSI_IOMMU be selected by irqchips that need it

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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.

Link: https://patch.msgid.link/r/a2620f67002c5cdf974e89ca3bf905f5c0817be6.1740014950.git.nicolinc@nvidia.com
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe 2025-02-19 17:31:39 -08:00
parent 288683c92b
commit 96093fe54f
4 changed files with 7 additions and 1 deletions
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1
drivers/iommu/Kconfig
View File

@ -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

2
drivers/iommu/dma-iommu.c
View File

@ -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;

4
drivers/irqchip/Kconfig
View File

@ -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
@ -408,6 +411,7 @@ 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

1
kernel/irq/Kconfig
View File

@ -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