On 5/1/20, 7:39 AM, Marc Zyngier wrote: > On a system that uses the internal DWC MSI widget, I get this > warning from debugfs when CONFIG_GENERIC_IRQ_DEBUGFS is selected: > > debugfs: File ':soc:pcie@fc000000' in directory 'domains' already present! > > This is due to the fact that the DWC MSI code tries to register two > IRQ domains for the same firmware node, without telling the low > level code how to distinguish them (by setting a bus token). This > further confuses debugfs which tries to create corresponding > files for each domain. > > Fix it by tagging the inner domain as DOMAIN_BUS_NEXUS, which is > the closest thing we have as to "generic MSI". > > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Acked-by: Jingoo Han <jingoohan1@xxxxxxxxx> > --- > drivers/pci/controller/dwc/pcie-designware-host.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c > index 395feb8ca051..3c43311bb95c 100644 > --- a/drivers/pci/controller/dwc/pcie-designware-host.c > +++ b/drivers/pci/controller/dwc/pcie-designware-host.c > @@ -264,6 +264,8 @@ int dw_pcie_allocate_domains(struct pcie_port *pp) > return -ENOMEM; > } > > + irq_domain_update_bus_token(pp->irq_domain, DOMAIN_BUS_NEXUS); > + > pp->msi_domain = pci_msi_create_irq_domain(fwnode, > &dw_pcie_msi_domain_info, > pp->irq_domain); > -- > 2.26.2
