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| author | Niklas Schnelle <schnelle@linux.ibm.com> | 2023-09-28 16:31:37 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-10-02 08:43:00 +0200 |
| commit | c76c067e488ccd55734c3e750799caf2c5956db6 (patch) | |
| tree | c4489302a1c2a119afcba4b54535cb4d8c65cbee /drivers/iommu/Kconfig | |
| parent | b6f888709a155b4e748aded93afc9fa43aaa28dd (diff) | |
| download | lwn-c76c067e488ccd55734c3e750799caf2c5956db6.tar.gz lwn-c76c067e488ccd55734c3e750799caf2c5956db6.zip | |
s390/pci: Use dma-iommu layer
While s390 already has a standard IOMMU driver and previous changes have
added I/O TLB flushing operations this driver is currently only used for
user-space PCI access such as vfio-pci. For the DMA API s390 instead
utilizes its own implementation in arch/s390/pci/pci_dma.c which drives
the same hardware and shares some code but requires a complex and
fragile hand over between DMA API and IOMMU API use of a device and
despite code sharing still leads to significant duplication and
maintenance effort. Let's utilize the common code DMAP API
implementation from drivers/iommu/dma-iommu.c instead allowing us to
get rid of arch/s390/pci/pci_dma.c.
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Link: https://lore.kernel.org/r/20230928-dma_iommu-v13-3-9e5fc4dacc36@linux.ibm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/Kconfig')
| -rw-r--r-- | drivers/iommu/Kconfig | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index cd6727898b11..3199fd54b462 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -91,7 +91,7 @@ config IOMMU_DEBUGFS choice prompt "IOMMU default domain type" depends on IOMMU_API - default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64 + default IOMMU_DEFAULT_DMA_LAZY if X86 || IA64 || S390 default IOMMU_DEFAULT_DMA_STRICT help Choose the type of IOMMU domain used to manage DMA API usage by @@ -146,7 +146,7 @@ config OF_IOMMU # IOMMU-agnostic DMA-mapping layer config IOMMU_DMA - def_bool ARM64 || IA64 || X86 + def_bool ARM64 || IA64 || X86 || S390 select DMA_OPS select IOMMU_API select IOMMU_IOVA |