Re: [PATCH 8/8] arm64: tegra: Add iommu-map and enable GPCDMA in Tegra264
From: Akhil R
Date: Tue Feb 24 2026 - 01:56:11 EST
On Tue, 17 Feb 2026 13:02:54 -0500, Frank Li wrote:
> On Tue, Feb 17, 2026 at 11:04:57PM +0530, Akhil R wrote:
>> Add iommu-map and remove iommus in the GPCDMA controller node so
>> that each channel uses separate stream ID and gets its own IOMMU
>> domain for memory. Also enable GPCDMA for Tegra264.
>>
>> Signed-off-by: Akhil R <akhilrajeev@xxxxxxxxxx>
>> ---
>> .../arm64/boot/dts/nvidia/tegra264-p3834.dtsi | 4 +++
>> arch/arm64/boot/dts/nvidia/tegra264.dtsi | 33 ++++++++++++++++++-
>> 2 files changed, 36 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi b/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi
>> index 7e2c3e66c2ab..c8beb616964a 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra264-p3834.dtsi
>> @@ -16,6 +16,10 @@ serial@c4e0000 {
>> serial@c5a0000 {
>> status = "okay";
>> };
>> +
>> + dma-controller@8400000 {
>> + status = "okay";
>> + };
>> };
>>
>> bus@8100000000 {
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra264.dtsi b/arch/arm64/boot/dts/nvidia/tegra264.dtsi
>> index 7644a41d5f72..0317418c95d3 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra264.dtsi
>> +++ b/arch/arm64/boot/dts/nvidia/tegra264.dtsi
>> @@ -3243,7 +3243,38 @@ gpcdma: dma-controller@8400000 {
>> <GIC_SPI 614 IRQ_TYPE_LEVEL_HIGH>,
>> <GIC_SPI 615 IRQ_TYPE_LEVEL_HIGH>;
>> #dma-cells = <1>;
>> - iommus = <&smmu1 0x00000800>;
>> + iommu-map =
>> + <1 &smmu1 0x801 1>,
>> + <2 &smmu1 0x802 1>,
>> + <3 &smmu1 0x803 1>,
>> + <4 &smmu1 0x804 1>,
>> + <5 &smmu1 0x805 1>,
>> + <6 &smmu1 0x806 1>,
>> + <7 &smmu1 0x807 1>,
>> + <8 &smmu1 0x808 1>,
>> + <9 &smmu1 0x809 1>,
>> + <10 &smmu1 0x80a 1>,
>> + <11 &smmu1 0x80b 1>,
>> + <12 &smmu1 0x80c 1>,
>> + <13 &smmu1 0x80d 1>,
>> + <14 &smmu1 0x80e 1>,
>> + <15 &smmu1 0x80f 1>,
>> + <16 &smmu1 0x810 1>,
>> + <17 &smmu1 0x811 1>,
>> + <18 &smmu1 0x812 1>,
>> + <19 &smmu1 0x813 1>,
>> + <20 &smmu1 0x814 1>,
>> + <21 &smmu1 0x815 1>,
>> + <22 &smmu1 0x816 1>,
>> + <23 &smmu1 0x817 1>,
>> + <24 &smmu1 0x818 1>,
>> + <25 &smmu1 0x819 1>,
>> + <26 &smmu1 0x81a 1>,
>> + <27 &smmu1 0x81b 1>,
>> + <28 &smmu1 0x81c 1>,
>> + <29 &smmu1 0x81d 1>,
>> + <30 &smmu1 0x81e 1>,
>> + <31 &smmu1 0x81f 1>;
>
> It is linear increase
> <1 &smmu1 0x801 31>;
Ack. I will update.
>
> Frank
>
>> dma-coherent;
>> dma-channel-mask = <0xfffffffe>;
>> status = "disabled";
>> --
Regards,
Akhil