On 06/19/2014 12:15 PM, bharat.bhus...@freescale.com wrote:
>
>
>> -----Original Message-----
>> From: Eric Auger [mailto:eric.au...@linaro.org]
>> Sent: Thursday, June 19, 2014 3:41 PM
>> To: Shannon Zhao; Bhushan Bharat-R65777; Alvise Rigo;
>> a.mota...@virtualopensystems.com; iommu@lists.linux-foundation.org;
>> kvm...@lists.cs.columbia.edu
>> Subject: Re: Vfio-on-arm: the device tree does not contain the DMA device
>>
>> On 06/19/2014 11:38 AM, Shannon Zhao wrote:
>>> Hi Bharat,
>>>
>>> On 2014/6/19 17:19, bharat.bhus...@freescale.com wrote:
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: kvmarm-boun...@lists.cs.columbia.edu [mailto:kvmarm-
>>>>> boun...@lists.cs.columbia.edu] On Behalf Of Shannon Zhao
>>>>> Sent: Thursday, June 19, 2014 2:45 PM
>>>>> To: Alvise Rigo; a.mota...@virtualopensystems.com; iommu@lists.linux-
>>>>> foundation.org; kvm...@lists.cs.columbia.edu
>>>>> 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
>
> Should not we use "driver-override" mechanism for binding with vfio-platform
> driver?
>
> Thanks
> -Bharat
Hi Bharat,
I guess Shannon is using an older version of the kernel. With
vfio-platform v4 this is the old unbind/bin mechanism that is in place,
if I am not wrong.
Best Regards
Eric
>
>>
>> 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
>>>>> kvm...@lists.cs.columbia.edu
>>>>> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
>>>>
>>>> .
>>>>
>>>
>
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