[PATCH 1/1] iommu/riscv: Support sharing irq lines between iommu queues

[Xu Lu]

When the number of wired interrupt lines is less than the number of
iommu queues, we should assign one irq line for several queues and
configure csr icvec accordingly.

Signed-off-by: Xu Lu <luxu.kernel at bytedance.com>
---
 drivers/iommu/riscv/iommu-platform.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iommu/riscv/iommu-platform.c b/drivers/iommu/riscv/iommu-platform.c
index da336863f152..1d0af1260d5b 100644
--- a/drivers/iommu/riscv/iommu-platform.c
+++ b/drivers/iommu/riscv/iommu-platform.c
@@ -60,6 +60,10 @@ static int riscv_iommu_platform_probe(struct platform_device *pdev)
 	for (vec = 0; vec < iommu->irqs_count; vec++)
 		iommu->irqs[vec] = platform_get_irq(pdev, vec);
 
+	for (vec = iommu->irqs_count; vec < RISCV_IOMMU_INTR_COUNT; vec++)
+		iommu->irqs[vec] = platform_get_irq(pdev,
+						    (vec % iommu->irqs_count));
+
 	/* Enable wire-signaled interrupts, fctl.WSI */
 	if (!(iommu->fctl & RISCV_IOMMU_FCTL_WSI)) {
 		iommu->fctl |= RISCV_IOMMU_FCTL_WSI;
-- 
2.20.1