diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-08-26 13:16:53 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-09-16 16:52:36 +0200 |
| commit | 2fd602669ee6d749a7dc47b84b87cef1a5075999 (patch) | |
| tree | 170afbc1fecbac65cd4d2787258f31794f8a884c /drivers/pci/msi.c | |
| parent | d7f954e54079b4bf6088956d59f43768ec71269a (diff) | |
| download | linux-2fd602669ee6d749a7dc47b84b87cef1a5075999.tar.bz2 | |
PCI/MSI: Provide pci_dev_has_special_msi_domain() helper
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>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20200826112333.139387358@linutronix.de
Diffstat (limited to 'drivers/pci/msi.c')
| -rw-r--r-- | drivers/pci/msi.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 744a1a4d2b32..a2f00d181016 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1553,4 +1553,26 @@ struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev) 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 */ |