• Jianmin Lv's avatar
    ACPI: scan: Support multiple DMA windows with different offsets · bf2ee8d0
    Jianmin Lv authored
    In DT systems configurations, of_dma_get_range() returns struct
    bus_dma_region DMA regions; they are used to set-up devices
    DMA windows with different offset available for translation between DMA
    address and CPU address.
    
    In ACPI systems configuration, acpi_dma_get_range() does not return
    DMA regions yet and that precludes setting up the dev->dma_range_map
    pointer and therefore DMA regions with multiple offsets.
    
    Update acpi_dma_get_range() to return struct bus_dma_region
    DMA regions like of_dma_get_range() does.
    
    After updating acpi_dma_get_range(), acpi_arch_dma_setup() is changed for
    ARM64, where the original dma_addr and size are removed as these
    arguments are now redundant, and pass 0 and U64_MAX for dma_base
    and size of arch_setup_dma_ops; this is a simplification consistent
    with what other ACPI architectures also pass to iommu_setup_dma_ops().
    Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
    Signed-off-by: default avatarJianmin Lv <lvjianmin@loongson.cn>
    Reviewed-by: default avatarLorenzo Pieralisi <lpieralisi@kernel.org>
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    bf2ee8d0
dma.c 1.39 KB