Re: [Xen-devel] ARM64: PCIe in DOM0

[Bharat Bhushan <bharat.bhushan@xxxxxxx>]

Further update: 
If I change Kconfig to enable this default
Then DOM0 Linux Boots but MSIs are not still working,

Getting below error:
  - pci 0001:00:00.0: Failed to add - passthrough or MSI/MSI-X might fail!

Any help is very useful,!!

Thanks
-Bharat

> -----Original Message-----
> From: Xen-devel <xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf Of
> Bharat Bhushan
> Sent: Friday, October 5, 2018 3:21 PM
> To: Xen-devel@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] ARM64: PCIe in DOM0
> 
> Hi All,
> 
> Further looking into XEN I found that " CONFIG_HAS_ITS" is not set, so the
> DOM0 device tree is not having git-its node.
> While I do not see a way using make menuconfig to enable
> CONFIG_HAS_ITS.
> 
> Thanks
> -Bharat
> 
> 
> > -----Original Message-----
> > From: Bharat Bhushan
> > Sent: Friday, October 5, 2018 2:09 PM
> > To: Xen-devel@xxxxxxxxxxxxxxxxxxxx
> > Subject: ARM64: PCIe in DOM0
> >
> > Hi All,
> >
> > I am booting XEN for the first time on my platform and observing that
> > PCIe are not working.
> >
> > Here are my observations on this.
> >
> > 1) "git-its" node (below) from device tree is not available in DOM0
> > device tree.
> >
> >                 its: gic-its@6020000 {
> >                         compatible = "arm,gic-v3-its";
> >                         msi-controller;
> >                         reg = <0x0 0x6020000 0 0x20000>;
> >                 };
> >
> >   We have "msi-parent" property in PCIe controller node which provides
> > phandle of above mentioned node.
> >   Linux (DOM0) error out if it does find a valid msi-parent.
> >
> > First question I have is, What is the reason for removing gic-its node?
> >
> > 2) Use Legacy interrupts rather than MSI
> >
> >   Used "pci=nomsi" in DOM0 bootargs to move away from MSIs,
> >
> >  Legacy interrupts are also not received and see netdev-watchdog.
> >
> > Can someone please help on what's wrong I am doing.
> >
> > Thanks
> > -Bharat
> >
> >
> 
> 
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