linux-kernel - [PATCH 5/5] media: verisilicon: Flush IOMMU before decoding a frame

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Message-ID: <20250616145607.116639-6-benjamin.gaignard@collabora.com>
Date: Mon, 16 Jun 2025 16:55:53 +0200
From: Benjamin Gaignard <benjamin.gaignard@...labora.com>
To: joro@...tes.org,
	will@...nel.org,
	robin.murphy@....com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	heiko@...ech.de,
	nicolas.dufresne@...labora.com,
	p.zabel@...gutronix.de,
	mchehab@...nel.org
Cc: iommu@...ts.linux.dev,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-media@...r.kernel.org,
	kernel@...labora.com,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH 5/5] media: verisilicon: Flush IOMMU before decoding a frame

Flush the IOMMU mapping before decoding a frame to ensure that all memory
translations are properly applied.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 drivers/media/platform/verisilicon/hantro_drv.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/media/platform/verisilicon/hantro_drv.c b/drivers/media/platform/verisilicon/hantro_drv.c
index 8542238e0fb1..5a672467d83f 100644
--- a/drivers/media/platform/verisilicon/hantro_drv.c
+++ b/drivers/media/platform/verisilicon/hantro_drv.c
@@ -11,6 +11,9 @@
  */
 
 #include <linux/clk.h>
+#include <linux/dma-map-ops.h>
+#include <linux/iommu.h>
+#include <linux/iommu-dma.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
@@ -186,6 +189,14 @@ static void device_run(void *priv)
 
 	v4l2_m2m_buf_copy_metadata(src, dst, true);
 
+	if (use_dma_iommu(ctx->dev->v4l2_dev.dev)) {
+		struct iommu_domain *mmu_dom;
+
+		mmu_dom = iommu_get_domain_for_dev(ctx->dev->v4l2_dev.dev);
+		if (mmu_dom)
+			iommu_flush_iotlb_all(mmu_dom);
+	}
+
 	if (ctx->codec_ops->run(ctx))
 		goto err_cancel_job;
 
-- 
2.43.0