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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
This commit is contained in:
Thomas Gleixner 2020-08-26 13:16:53 +02:00
parent d7f954e540
commit 2fd602669e
2 changed files with 23 additions and 0 deletions
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22
drivers/pci/msi.c
View File

@ -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 */

1
include/linux/msi.h
View File

@ -373,6 +373,7 @@ int pci_msi_domain_check_cap(struct irq_domain *domain,
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)
{