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PCI/MSI: Move pci_alloc_irq_vectors() to api.c
To disentangle the maze in msi.c, all exported device-driver MSI APIs are now to be grouped in one file, api.c. Make pci_alloc_irq_vectors() a real function instead of wrapper and add proper kernel doc to it. Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Link: https://lore.kernel.org/r/20221111122014.870888193@linutronix.de
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2 changed files with 44 additions and 4 deletions
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@ -90,3 +90,36 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
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return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
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}
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EXPORT_SYMBOL(pci_enable_msix_range);
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/**
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* pci_alloc_irq_vectors() - Allocate multiple device interrupt vectors
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* @dev: the PCI device to operate on
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* @min_vecs: minimum required number of vectors (must be >= 1)
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* @max_vecs: maximum desired number of vectors
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* @flags: One or more of:
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* %PCI_IRQ_MSIX Allow trying MSI-X vector allocations
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* %PCI_IRQ_MSI Allow trying MSI vector allocations
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* %PCI_IRQ_LEGACY Allow trying legacy INTx interrupts, if
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* and only if @min_vecs == 1
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* %PCI_IRQ_AFFINITY Auto-manage IRQs affinity by spreading
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* the vectors around available CPUs
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*
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* Allocate up to @max_vecs interrupt vectors on device. MSI-X irq
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* vector allocation has a higher precedence over plain MSI, which has a
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* higher precedence over legacy INTx emulation.
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*
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* Upon a successful allocation, the caller should use pci_irq_vector()
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* to get the Linux IRQ number to be passed to request_threaded_irq().
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* The driver must call pci_free_irq_vectors() on cleanup.
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*
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* Return: number of allocated vectors (which might be smaller than
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* @max_vecs), -ENOSPC if less than @min_vecs interrupt vectors are
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* available, other errnos otherwise.
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*/
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int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
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unsigned int max_vecs, unsigned int flags)
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{
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return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
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flags, NULL);
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}
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EXPORT_SYMBOL(pci_alloc_irq_vectors);
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@ -1553,6 +1553,8 @@ static inline int pci_enable_msix_exact(struct pci_dev *dev,
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return rc;
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return 0;
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}
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int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
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unsigned int max_vecs, unsigned int flags);
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int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
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unsigned int max_vecs, unsigned int flags,
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struct irq_affinity *affd);
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@ -1586,6 +1588,13 @@ pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
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return 1;
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return -ENOSPC;
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}
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static inline int
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pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
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unsigned int max_vecs, unsigned int flags)
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{
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return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
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flags, NULL);
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}
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static inline void pci_free_irq_vectors(struct pci_dev *dev)
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{
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@ -1898,15 +1907,13 @@ pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
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{
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return -ENOSPC;
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}
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#endif /* CONFIG_PCI */
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static inline int
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pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
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unsigned int max_vecs, unsigned int flags)
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{
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return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs, flags,
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NULL);
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return -ENOSPC;
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}
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#endif /* CONFIG_PCI */
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/* Include architecture-dependent settings and functions */
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