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

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

Hi Bharat,

On 2014/6/19 17:19, Bharat.Bhushan-KZfg59tc24xl57MIdRCFDg@public.gmane.org wrote:
> 
> 
>> -----Original Message-----
>> From: kvmarm-bounces-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg@public.gmane.org [mailto:kvmarm-
>> bounces-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg@public.gmane.org] On Behalf Of Shannon Zhao
>> Sent: Thursday, June 19, 2014 2:45 PM
>> To: Alvise Rigo; a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org; iommu-cunTk1MwBs/ROKNJybVBZg@public.gmane.org
>> foundation.org; kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg@public.gmane.org
>> Subject: Re: Vfio-on-arm: the device tree does not contain the DMA device
>>
>> 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,:
> 
> Why do we need to give "vfio_group=/dev/vfio/0" ?
I refer to the url "http://www.virtualopensystems.com/en/solutions/guides/vfio-on-arm/".
> 
> 
>> 	could not open disk image vfio_container=/dev/vfio:
>> 	Could not open 'vfio_container=/dev/vfio': No such file or directory
> 
> Are you unbinding "2c0a0000.dma" from its driver and binding with "vfio-playform" driver ?
How to unbind "2c0a0000.dma" from its driver?
I have tried following cmd to bind "2c0a0000.dma" with "vfio-playform" driver.
	echo 2c0a0000.dma > /sys/bus/platform/drivers/vfio-platform/vfio_bind
But there is no /dev/vfio/0 or /dev/vfio/vfio .

> 
> Thanks
> -Bharat
> 
>>
>> 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
>>
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> 
> .
> 

-- 
Shannon