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PCI/MSI: Move pci_irq_get_affinity() 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. Move pci_irq_get_affinity() and let its kernel-doc match rest of the file. 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/20221111122015.214792769@linutronix.de
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@ -9,6 +9,7 @@
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*/
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#include <linux/export.h>
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#include <linux/irq.h>
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#include "msi.h"
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@ -250,6 +251,48 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr)
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}
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EXPORT_SYMBOL(pci_irq_vector);
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/**
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* pci_irq_get_affinity() - Get a device interrupt vector affinity
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* @dev: the PCI device to operate on
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* @nr: device-relative interrupt vector index (0-based); has different
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* meanings, depending on interrupt mode
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* MSI-X the index in the MSI-X vector table
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* MSI the index of the enabled MSI vectors
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* INTx must be 0
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*
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* Return: MSI/MSI-X vector affinity, NULL if @nr is out of range or if
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* the MSI(-X) vector was allocated without explicit affinity
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* requirements (e.g., by pci_enable_msi(), pci_enable_msix_range(), or
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* pci_alloc_irq_vectors() without the %PCI_IRQ_AFFINITY flag). Return a
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* generic set of CPU IDs representing all possible CPUs available
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* during system boot if the device is in legacy INTx mode.
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*/
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const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
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{
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int idx, irq = pci_irq_vector(dev, nr);
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struct msi_desc *desc;
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if (WARN_ON_ONCE(irq <= 0))
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return NULL;
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desc = irq_get_msi_desc(irq);
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/* Non-MSI does not have the information handy */
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if (!desc)
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return cpu_possible_mask;
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/* MSI[X] interrupts can be allocated without affinity descriptor */
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if (!desc->affinity)
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return NULL;
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/*
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* MSI has a mask array in the descriptor.
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* MSI-X has a single mask.
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*/
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idx = dev->msi_enabled ? nr : 0;
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return &desc->affinity[idx].mask;
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}
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EXPORT_SYMBOL(pci_irq_get_affinity);
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/**
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* pci_free_irq_vectors() - Free previously allocated IRQs for a device
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* @dev: the PCI device to operate on
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@ -854,44 +854,6 @@ int __pci_enable_msix_range(struct pci_dev *dev,
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}
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}
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/**
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* pci_irq_get_affinity - return the affinity of a particular MSI vector
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* @dev: PCI device to operate on
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* @nr: device-relative interrupt vector index (0-based).
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*
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* @nr has the following meanings depending on the interrupt mode:
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* MSI-X: The index in the MSI-X vector table
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* MSI: The index of the enabled MSI vectors
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* INTx: Must be 0
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*
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* Return: A cpumask pointer or NULL if @nr is out of range
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*/
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const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
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{
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int idx, irq = pci_irq_vector(dev, nr);
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struct msi_desc *desc;
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if (WARN_ON_ONCE(irq <= 0))
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return NULL;
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desc = irq_get_msi_desc(irq);
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/* Non-MSI does not have the information handy */
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if (!desc)
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return cpu_possible_mask;
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/* MSI[X] interrupts can be allocated without affinity descriptor */
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if (!desc->affinity)
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return NULL;
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/*
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* MSI has a mask array in the descriptor.
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* MSI-X has a single mask.
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*/
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idx = dev->msi_enabled ? nr : 0;
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return &desc->affinity[idx].mask;
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}
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EXPORT_SYMBOL(pci_irq_get_affinity);
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struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
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{
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return to_pci_dev(desc->dev);
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