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

[Eric Auger <eric.auger-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>]

On 06/19/2014 11:38 AM, Shannon Zhao wrote:
> 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 .

Hi Shannon,

you may try following cmd to unbind the native dma driver
echo 2c0a0000.dma | sudo tee -a
/sys/bus/platform/devices/2c0a0000.dma/driver/unbind

and then the following one to bing the meta-driver to the device
echo 2c0a0000.dma | sudo tee -a
/sys/bus/platform/drivers/vfio-platform/vfio_bind

Best Regards

Eric

> 
>>
>> 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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>>
>> .
>>
>