| Message ID | 20200821002947.373714034@linutronix.de |
|---|---|
| State | New |
| Headers | show |
| Series | x86, PCI, XEN, genirq ...: Prepare for device MSI | expand |
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@linutronix.de> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: linux-pci@vger.kernel.org Acked-by: Bjorn Helgaas <bhelgaas@google.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) > { >
--- 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) {
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@linutronix.de> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: linux-pci@vger.kernel.org --- drivers/pci/msi.c | 22 ++++++++++++++++++++++ include/linux/msi.h | 1 + 2 files changed, 23 insertions(+)