linux-kernel - Re: [PATCH] PCI: dwc: Fix inner MSI IRQ domain registration

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Date:   Tue, 5 May 2020 12:53:13 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH] PCI: dwc: Fix inner MSI IRQ domain registration

On Fri, May 01, 2020 at 12:39:21PM +0100, 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@...00000' 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@...nel.org>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied to pci/dwc, thanks !

Lorenzo

> 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
>