Commit 2fd60266 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

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: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20200826112333.139387358@linutronix.de
parent d7f954e5

drivers/pci/msi.c

+22 −0
Original line number Diff line number Diff line
@@ -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 */

include/linux/msi.h

+1 −0
Original line number Diff line number Diff line
@@ -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)

{

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