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

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Message-Id: <20240701072908.25503-2-luxu.kernel@bytedance.com>
Date: Mon,  1 Jul 2024 15:29:08 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: tjeznach@...osinc.com,
	joro@...tes.org,
	will@...nel.org,
	robin.murphy@....com,
	paul.walmsley@...ive.com
Cc: palmer@...belt.com,
	aou@...s.berkeley.edu,
	apatel@...tanamicro.com,
	sunilvl@...tanamicro.com,
	iommu@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux@...osinc.com,
	baolu.lu@...ux.intel.com,
	lihangjing@...edance.com,
	xieyongji@...edance.com,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [PATCH 1/1] iommu/riscv: Support sharing irq lines between iommu queues

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@...edance.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