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Re: [Xen-users] i2c pass-through in mpsoc

On 09/10/17 10:33, Jesús Lázaro wrote:


I am trying to pass the I2C peripherial in an mpsoc. I have been following the example to pass the mac but I keep getting the following error:

(XEN) XEN_DOMCTL_assign_dt_device: assign "/amba/i2c@ff030000" to dom1 failed (-22) libxl: error: libxl_create.c:1424:libxl__add_dtdevs: xc_assign_dtdevice failed: -1 libxl: error: libxl_create.c:1461:domcreate_attach_devices: unable to add dtdev devices

This is normal. dtdev will fail when the device passthrough-ed is not behind an SMMU.

dtdev is only necessary when your device is behind an SMMU. If you know your device will not do DMA, then you can safely drop dtdev=... and continue.

You might also be interested by the discussion [1] which happened on xen-devel recently regarding the same problem.


[1] https://lists.xenproject.org/archives/html/xen-devel/2017-10/msg00386.html

Attached I send the config file as well as the pass-through device tree.

In the main device tree I have modified the I2C to:

i2c@ff030000 {
   compatible = "cdns,i2c-r1p14", "cdns,i2c-r1p10";
   status = "disabled";
   xen,passthrough = "1";
   interrupt-parent = <0x4>;
   interrupts = <0x0 0x12 0x4>;
   reg = <0x0 0xff030000 0x0 0x1000>;
   #address-cells = <0x1>;
   #size-cells = <0x0>;
   power-domains = <0x12>;
   clocks = <0x3 0x3e>;
   clock-frequency = <0x61a80>;

Any hints on where the problem is?



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Julien Grall

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