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PCI: Add pci_irq_type() to query the allocated interrupt type

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Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX
based on the interrupt type the PCI core selected after
pci_alloc_irq_vectors().

Several drivers already open-code this check against pdev->msix_enabled
and pdev->msi_enabled, or even open code this helper [1].

A common helper avoids the duplication and keeps drivers from accessing
the bitfield directly (see also [2]).

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1]
Inspired-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2]
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org
[ Add missing pci_irq_type() stub for CONFIG_PCI=n. ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich
2026-08-13 18:52:04 +02:00
parent 6ca38086b4
commit f146c7bc85
1 changed files with 30 additions and 0 deletions
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30
include/linux/pci.h
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@@ -1783,6 +1783,26 @@ void pci_free_irq_vectors(struct pci_dev *dev);
int pci_irq_vector(struct pci_dev *dev, unsigned int nr);
const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, int vec);
/**
* pci_irq_type - Get the interrupt type of a PCI device
* @pdev: the PCI device to operate on
*
* Discriminate the interrupt type the PCI core selected for this device
* after a successful pci_alloc_irq_vectors() call.
*
* Return: %PCI_IRQ_MSIX, %PCI_IRQ_MSI, or %PCI_IRQ_INTX.
*/
static inline unsigned int pci_irq_type(struct pci_dev *pdev)
{
if (pdev->msix_enabled)
return PCI_IRQ_MSIX;
if (pdev->msi_enabled)
return PCI_IRQ_MSI;
return PCI_IRQ_INTX;
}
#else
static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
static inline void pci_disable_msi(struct pci_dev *dev) { }
@@ -1845,6 +1865,11 @@ static inline const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev,
{
return cpu_possible_mask;
}
static inline unsigned int pci_irq_type(struct pci_dev *pdev)
{
return PCI_IRQ_INTX;
}
#endif
/**
@@ -2255,6 +2280,11 @@ static inline bool pci_suspend_retains_context(struct pci_dev *pdev)
{
return true;
}
static inline unsigned int pci_irq_type(struct pci_dev *pdev)
{
return 0;
}
#endif /* CONFIG_PCI */
/* Include architecture-dependent settings and functions */