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Date: Tue, 25 Aug 2020 15:16:34 -0500 From: Bjorn Helgaas <helgaas@...nel.org> To: Thomas Gleixner <tglx@...utronix.de> Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org, Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org, Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org, Haiyang Zhang <haiyangz@...rosoft.com>, Jon Derrick <jonathan.derrick@...el.com>, Lu Baolu <baolu.lu@...ux.intel.com>, Wei Liu <wei.liu@...nel.org>, "K. Y. Srinivasan" <kys@...rosoft.com>, Stephen Hemminger <sthemmin@...rosoft.com>, Steve Wahl <steve.wahl@....com>, Dimitri Sivanich <sivanich@....com>, Russ Anderson <rja@....com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, xen-devel@...ts.xenproject.org, Juergen Gross <jgross@...e.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Stefano Stabellini <sstabellini@...nel.org>, Marc Zyngier <maz@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, Megha Dey <megha.dey@...el.com>, Jason Gunthorpe <jgg@...lanox.com>, Dave Jiang <dave.jiang@...el.com>, Alex Williamson <alex.williamson@...hat.com>, Jacob Pan <jacob.jun.pan@...el.com>, Baolu Lu <baolu.lu@...el.com>, Kevin Tian <kevin.tian@...el.com>, Dan Williams <dan.j.williams@...el.com> Subject: Re: [patch RFC 21/38] PCI: MSI: Provide pci_dev_has_special_msi_domain() helper On Fri, Aug 21, 2020 at 02:24:45AM +0200, Thomas Gleixner wrote: > Provide a helper function to check whether a PCI device is handled by a > non-standard PCI/MSI domain. This will be used to exclude such devices > which hang of a special bus, e.g. VMD, to be excluded from the irq domain > override in irq remapping. > > Signed-off-by: Thomas Gleixner <tglx@...utronix.de> > Cc: Bjorn Helgaas <bhelgaas@...gle.com> > Cc: linux-pci@...r.kernel.org Acked-by: Bjorn Helgaas <bhelgaas@...gle.com> s|PCI: MSI:|PCI/MSI:| in the subject if feasible. > --- > drivers/pci/msi.c | 22 ++++++++++++++++++++++ > include/linux/msi.h | 1 + > 2 files changed, 23 insertions(+) > > --- a/drivers/pci/msi.c > +++ b/drivers/pci/msi.c > @@ -1553,4 +1553,26 @@ struct irq_domain *pci_msi_get_device_do > DOMAIN_BUS_PCI_MSI); > return dom; > } > + > +/** > + * pci_dev_has_special_msi_domain - Check whether the device is handled by > + * a non-standard PCI-MSI domain > + * @pdev: The PCI device to check. > + * > + * Returns: True if the device irqdomain or the bus irqdomain is > + * non-standard PCI/MSI. > + */ > +bool pci_dev_has_special_msi_domain(struct pci_dev *pdev) > +{ > + struct irq_domain *dom = dev_get_msi_domain(&pdev->dev); > + > + if (!dom) > + dom = dev_get_msi_domain(&pdev->bus->dev); > + > + if (!dom) > + return true; > + > + return dom->bus_token != DOMAIN_BUS_PCI_MSI; > +} > + > #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */ > --- a/include/linux/msi.h > +++ b/include/linux/msi.h > @@ -374,6 +374,7 @@ int pci_msi_domain_check_cap(struct irq_ > struct msi_domain_info *info, struct device *dev); > u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev); > struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev); > +bool pci_dev_has_special_msi_domain(struct pci_dev *pdev); > #else > static inline struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev) > { >
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