ACPI: scan: Support multiple DMA windows with different offsets
authorJianmin Lv <lvjianmin@loongson.cn>
Sun, 11 Sep 2022 09:06:34 +0000 (17:06 +0800)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Sat, 24 Sep 2022 16:39:21 +0000 (18:39 +0200)
commitbf2ee8d0c385f883a00473768b67faf2189b2410
treee1a73ba0e7d936f24f740d2754a78f0a3bd0feab
parent521a547ced6477c54b4b0cc206000406c221b4d6
ACPI: scan: Support multiple DMA windows with different offsets

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: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Reviewed-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/acpi/arm64/dma.c
drivers/acpi/scan.c
include/acpi/acpi_bus.h
include/linux/acpi.h