diff options
| author | Jason Gunthorpe | 2025-02-19 17:31:39 -0800 |
|---|---|---|
| committer | Jason Gunthorpe | 2025-02-21 10:48:38 -0400 |
| commit | 96093fe54f4864b07013cf61b847708233832841 (patch) | |
| tree | 0bbbaa13ac307a0a4c927b3f3e21c6c658d4a7df /kernel | |
| parent | 288683c92b1abc32277c83819bea287af614d239 (diff) | |
irqchip: Have CONFIG_IRQ_MSI_IOMMU be selected by irqchips that need it
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/irq/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
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 |