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

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

Hi Eric,

Thanks for your reply.
There is no such directory "/sys/bus/platform/devices/2c0a0000.dma/driver/".

On 2014/6/19 18:11, Eric Auger wrote:
> 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
>>>>
>>>> _______________________________________________
>>>> kvmarm mailing list
>>>> kvmarm-FPEHb7Xf0XXUo1n7N8X6UoWGPAHP3yOg@public.gmane.org
>>>> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
>>>
>>> .
>>>
>>
> 
> 
> .
> 

-- 
Shannon