Re: Vfio-on-arm: the device tree does not contain the DMA device

[Shannon Zhao <zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>]

Hi Alvise,

Thanks for your reply.
I have apply the patch and could see the DMA devices.
But there is no vosys_dmatest int the directory "/sys/kernel/debug/" after mounting debugfs.
I found that the branch vfio-platform-v4 doesn't contain the module vosys_dmatest.
Then I port it from the branch pl330_dmatest and run vosys_dmatest successfully.

	echo 1 > /sys/kernel/debug/vosys_dmatest/start

	[ 6145.343419] dmaengine: __dma_request_channel: success (dma0chan0)
	[ 6145.344000] vosys dmatest: callback: transfer completed
	[ 6145.344147] vosys dmatest: tx completed
	[ 6145.344589] vosys dmatest: source and destination match.

Download the qemu and use following command to start a guest:
	./qemu-system-arm -enable-kvm -M vexpress-a15 -cpu cortex-a15 \
        	-device pl330,vfio_group="/dev/vfio/0",vfio_device="2c0a0000.dma",\
        	vfio_container="/dev/vfio/vfio" \
        	-append "earlyprintk ip=dhcp console=ttyAMA0 rootwait" \
        	-kernel zImage -dtb guest.dtb -initrd filesystem.cpio.gz  -nographic
An error reported:
	qemu-system-arm: -device pl330,vfio_group=/dev/vfio/0,vfio_device=2c0a0000.dma,:
	could not open disk image vfio_container=/dev/vfio:
	Could not open 'vfio_container=/dev/vfio': No such file or directory
	
Is there something I'm wrong or do I miss some steps?

Thank you,
Shannon

On 2014/6/18 21:24, Alvise Rigo wrote:
> Hi Shannon,
> 
> Thank you for reporting this issue, the device tree file was indeed missing.
> To solve the problem, you can apply the following patch to the
> repository you mentioned
> (git://github.com/virtualopensystems/arm-dts.git).
> 
> For your information, soon we will update the guide with a newer version
> of VFIO with this issue fixed.
> 
> Thank you,
> alvise
> 
> ---
>  fast_models/rtsm_ve-cortex_a15x4_a7x4.dts | 100
> +++++++++++++++++++++++++++++-
>  1 file changed, 97 insertions(+), 3 deletions(-)
> 
> diff --git a/fast_models/rtsm_ve-cortex_a15x4_a7x4.dts
> b/fast_models/rtsm_ve-cortex_a15x4_a7x4.dts
> index ef1275b..79c6af2 100644
> --- a/fast_models/rtsm_ve-cortex_a15x4_a7x4.dts
> +++ b/fast_models/rtsm_ve-cortex_a15x4_a7x4.dts
> @@ -142,7 +142,7 @@
>  		cpu7: cpu@7 {
>  			device_type = "cpu";
>  			compatible = "arm,cortex-a7";
> -			reg = <0x104>;
> +			reg = <0x103>;
>  			cluster = <&cluster1>;
>  			core = <&core7>;
>  		};
> @@ -159,7 +159,7 @@
>  		#address-cells = <0>;
>  		interrupt-controller;
>  		reg = <0 0x2c001000 0 0x1000>,
> -		      <0 0x2c002000 0 0x2000>,
> +		      <0 0x2c002000 0 0x1000>,
>  		      <0 0x2c004000 0 0x2000>,
>  		      <0 0x2c006000 0 0x2000>;
>  		interrupts = <1 9 0xf04>;
> @@ -183,6 +183,101 @@
>  			     <1 10 0xf08>;
>  	};
> 
> +	smmu@2c0b0000 {
> +                compatible = "arm,smmu-v2";
> +                reg = <0x0 0x2c0b0000 0x0 0x10000>;
> +                #global-interrupts = <2>;
> +                interrupts = <0 58 4>,
> +                             <0 59 4>,
> +                             <0 60 4>,
> +                             <0 60 4>,
> +                             <0 60 4>,
> +                             <0 60 4>,
> +                             <0 60 4>,
> +                             <0 60 4>,
> +                             <0 60 4>;
> +                mmu-masters = <&dma0 0x0 0x8>,
> +                              <&dma1 0x1 0x9>,
> +                              <&dma2 0x2 0xa>,
> +                              <&dma3 0x3 0xb>;
> +        };
> +
> +	dma0: dma@2c0a0000 {
> +		compatible = "arm,pl330";
> +		reg = <0 0x2c0a0000 0 0x1000>;
> +		interrupts = <0 64 4>,
> +			     <0 65 4>,
> +			     <0 66 4>,
> +			     <0 67 4>,
> +			     <0 68 4>,
> +			     <0 69 4>,
> +			     <0 70 4>,
> +			     <0 71 4>;
> +		#dma-cells = <1>;
> +		#stream-id-cells = <2>;
> +		clocks = <&oscclk6a>;
> +		clock-names = "apb_pclk";
> +	};
> +
> +	dma1: dma@2c0a1000 {
> +		compatible = "arm,pl330", "arm,primecell";
> +		reg = <0 0x2c0a1000 0 0x1000>;
> +		interrupts = <0 96 4>,
> +			     <0 97 4>,
> +			     <0 98 4>,
> +			     <0 99 4>,
> +			     <0 100 4>,
> +			     <0 101 4>,
> +			     <0 102 4>,
> +			     <0 103 4>;
> +		#dma-cells = <1>;
> +		#stream-id-cells = <2>;
> +		clocks = <&oscclk6a>;
> +		clock-names = "apb_pclk";
> +	};
> +
> +	dma2: dma@2c0a2000 {
> +		compatible = "arm,pl330", "arm,primecell";
> +		reg = <0 0x2c0a2000 0 0x1000>;
> +		interrupts = <0 128 4>,
> +			     <0 129 4>,
> +			     <0 130 4>,
> +			     <0 131 4>,
> +			     <0 132 4>,
> +			     <0 133 4>,
> +			     <0 134 4>,
> +			     <0 135 4>;
> +		#dma-cells = <1>;
> +		#stream-id-cells = <2>;
> +		clocks = <&oscclk6a>;
> +		clock-names = "apb_pclk";
> +	};
> +
> +	dma3: dma@2c0a3000 {
> +		compatible = "arm,pl330", "arm,primecell";
> +		reg = <0 0x2c0a3000 0 0x1000>;
> +		interrupts = <0 160 4>,
> +			     <0 161 4>,
> +			     <0 162 4>,
> +			     <0 163 4>,
> +			     <0 164 4>,
> +			     <0 165 4>,
> +			     <0 166 4>,
> +			     <0 167 4>;
> +		#dma-cells = <1>;
> +		#stream-id-cells = <2>;
> +		clocks = <&oscclk6a>;
> +		clock-names = "apb_pclk";
> +	};
> +
> +	oscclk6a: oscclk6a {
> +		/* Reference 24MHz clock */
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <24000000>;
> +		clock-output-names = "oscclk6a";
> +	};
> +
>  	smb {
>  		compatible = "simple-bus";
> 
> @@ -244,4 +339,3 @@
>  		/include/ "rtsm_ve-motherboard.dtsi"
>  	};
>  };
> -
> 

-- 
Shannon