linux-kernel - [PATCH v8 5/7] media: verisilicon: AV1: Restore IOMMU context before decoding a frame

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250827090809.34555-6-benjamin.gaignard@collabora.com>
Date: Wed, 27 Aug 2025 11:08:01 +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,
	jgg@...pe.ca,
	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,
	kernel@...labora.com,
	linux-media@...r.kernel.org,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH v8 5/7] media: verisilicon: AV1: Restore IOMMU context before decoding a frame

AV1 is a stateless decoder which means multiple AV1 bitstreams could be
decoded at the same time using the same hardware block. Before decoding
a frame it is needed to restore the iommu tables to avoid mixing decode
contexts.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 .../verisilicon/rockchip_vpu981_hw_av1_dec.c       | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c b/drivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c
index e4703bb6be7c..9e7a7d9ad58a 100644
--- a/drivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c
+++ b/drivers/media/platform/verisilicon/rockchip_vpu981_hw_av1_dec.c
@@ -5,6 +5,9 @@
  * Author: Benjamin Gaignard <benjamin.gaignard@...labora.com>
  */
 
+#include <linux/iommu.h>
+#include <linux/vsi-iommu.h>
+
 #include <media/v4l2-mem2mem.h>
 #include "hantro.h"
 #include "hantro_v4l2.h"
@@ -2095,12 +2098,23 @@ rockchip_vpu981_av1_dec_set_output_buffer(struct hantro_ctx *ctx)
 	hantro_write_addr(vpu, AV1_TILE_OUT_MV, mv_addr);
 }
 
+static void rockchip_vpu981_av1_restore_iommu(struct hantro_ctx *ctx)
+{
+	struct iommu_domain *domain;
+
+	domain = iommu_get_domain_for_dev(ctx->dev->v4l2_dev.dev);
+	if (domain)
+		vsi_iommu_restore_ctx(domain);
+}
+
 int rockchip_vpu981_av1_dec_run(struct hantro_ctx *ctx)
 {
 	struct hantro_dev *vpu = ctx->dev;
 	struct vb2_v4l2_buffer *vb2_src;
 	int ret;
 
+	rockchip_vpu981_av1_restore_iommu(ctx);
+
 	hantro_start_prepare_run(ctx);
 
 	ret = rockchip_vpu981_av1_dec_prepare_run(ctx);
-- 
2.43.0