[PATCH v4 1/7] iommu/riscv: Enable IOMMU DMA mapping support

[Lv Zheng]

From: Jingyu Li <joey.li at spacemit.com>

Enables IOMMU DMA mapping support for RISC-V, so that DMACs can be tested
with translation enabled.

Known Possible Issue:
1. When CONFIG_IOMMU_DMA is enabled, on the tested Linux, RISC-V IOMMU is
   lack of PCIe support, causing riscv_iommu_fault:522 in dealing with
   NVMe PCIe devices.

Signed-off-by: Jingyu Li <joey.li at spacemit.com>
Signed-off-by: Lv Zheng <lv.zheng at linux.spacemit.com>
---
 drivers/iommu/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index f86262b11416..34d8a792339f 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -151,7 +151,7 @@ config OF_IOMMU
 
 # IOMMU-agnostic DMA-mapping layer
 config IOMMU_DMA
-	def_bool ARM64 || X86 || S390
+	def_bool ARM64 || X86 || S390 || RISCV
 	select DMA_OPS_HELPERS
 	select IOMMU_API
 	select IOMMU_IOVA
-- 
2.43.0