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    SubjectRe: [PATCH v7 4/6] s390/pci: Use dma-iommu layer
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    On 2/20/23 10:22 AM, Niklas Schnelle wrote:
    > 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.
    >
    > Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>

    Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>

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