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PCI/MSI: Move pci_enable_msix_range() 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_enable_msix_range() and make its kernel-doc comprehensive. 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/20221111122014.813792885@linutronix.de
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3 changed files with 39 additions and 26 deletions
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@ -58,3 +58,35 @@ void pci_disable_msi(struct pci_dev *dev)
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msi_unlock_descs(&dev->dev);
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}
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EXPORT_SYMBOL(pci_disable_msi);
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/**
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* pci_enable_msix_range() - Enable MSI-X interrupt mode on device
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* @dev: the PCI device to operate on
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* @entries: input/output parameter, array of MSI-X configuration entries
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* @minvec: minimum required number of MSI-X vectors
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* @maxvec: maximum desired number of MSI-X vectors
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*
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* Legacy device driver API to enable MSI-X interrupt mode on device and
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* configure its MSI-X capability structure as appropriate. The passed
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* @entries array must have each of its members "entry" field set to a
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* desired (valid) MSI-X vector number, where the range of valid MSI-X
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* vector numbers can be queried through pci_msix_vec_count(). If
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* successful, the driver must invoke pci_disable_msix() on cleanup.
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*
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* NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API
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* pair should, in general, be used instead.
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*
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* Return: number of MSI-X vectors allocated (which might be smaller
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* than @maxvecs), where Linux IRQ numbers for such allocated vectors
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* are saved back in the @entries array elements' "vector" field. Return
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* -ENOSPC if less than @minvecs interrupt vectors are available.
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* Return -EINVAL if one of the passed @entries members "entry" field
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* was invalid or a duplicate, or if plain MSI interrupts mode was
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* earlier enabled on device. Return other errnos otherwise.
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*/
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int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
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int minvec, int maxvec)
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{
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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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@ -844,7 +844,7 @@ int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
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}
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}
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static int __pci_enable_msix_range(struct pci_dev *dev,
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int __pci_enable_msix_range(struct pci_dev *dev,
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struct msix_entry *entries, int minvec,
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int maxvec, struct irq_affinity *affd,
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int flags)
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@ -886,28 +886,6 @@ static 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_enable_msix_range - configure device's MSI-X capability structure
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* @dev: pointer to the pci_dev data structure of MSI-X device function
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* @entries: pointer to an array of MSI-X entries
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* @minvec: minimum number of MSI-X IRQs requested
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* @maxvec: maximum number of MSI-X IRQs requested
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*
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* Setup the MSI-X capability structure of device function with a maximum
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* possible number of interrupts in the range between @minvec and @maxvec
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* upon its software driver call to request for MSI-X mode enabled on its
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* hardware device function. It returns a negative errno if an error occurs.
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* If it succeeds, it returns the actual number of interrupts allocated and
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* indicates the successful configuration of MSI-X capability structure
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* with new allocated MSI-X interrupts.
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**/
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int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
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int minvec, int maxvec)
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{
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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_affinity - allocate multiple IRQs for a device
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* @dev: PCI device to operate on
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@ -88,8 +88,11 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
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void pci_msi_shutdown(struct pci_dev *dev);
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void pci_free_msi_irqs(struct pci_dev *dev);
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int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
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int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec,
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int maxvec, struct irq_affinity *affd, int flags);
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/* Legacy (!IRQDOMAIN) fallbacks */
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#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
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int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
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void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev);
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