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PCI/MSI: Move pci_alloc_irq_vectors() to api.c

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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
This commit is contained in:
Ahmed S. Darwish 2022-11-11 14:54:50 +01:00 • committed by Thomas Gleixner
parent be7496c1ef
commit 5c0997dc33
2 changed files with 44 additions and 4 deletions
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33
drivers/pci/msi/api.c
View file

@ -90,3 +90,36 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0); return __pci_enable_msix_range(dev, entries, minvec, maxvec, NULL, 0);
} }
EXPORT_SYMBOL(pci_enable_msix_range); EXPORT_SYMBOL(pci_enable_msix_range);
/**
* pci_alloc_irq_vectors() - Allocate multiple device interrupt vectors
* @dev: the PCI device to operate on
* @min_vecs: minimum required number of vectors (must be >= 1)
* @max_vecs: maximum desired number of vectors
* @flags: One or more of:
* %PCI_IRQ_MSIX Allow trying MSI-X vector allocations
* %PCI_IRQ_MSI Allow trying MSI vector allocations
* %PCI_IRQ_LEGACY Allow trying legacy INTx interrupts, if
* and only if @min_vecs == 1
* %PCI_IRQ_AFFINITY Auto-manage IRQs affinity by spreading
* the vectors around available CPUs
*
* Allocate up to @max_vecs interrupt vectors on device. MSI-X irq
* vector allocation has a higher precedence over plain MSI, which has a
* higher precedence over legacy INTx emulation.
*
* Upon a successful allocation, the caller should use pci_irq_vector()
* to get the Linux IRQ number to be passed to request_threaded_irq().
* The driver must call pci_free_irq_vectors() on cleanup.
*
* Return: number of allocated vectors (which might be smaller than
* @max_vecs), -ENOSPC if less than @min_vecs interrupt vectors are
* available, other errnos otherwise.
*/
int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
unsigned int max_vecs, unsigned int flags)
{
return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
flags, NULL);
}
EXPORT_SYMBOL(pci_alloc_irq_vectors);

15
include/linux/pci.h
View file

@ -1553,6 +1553,8 @@ static inline int pci_enable_msix_exact(struct pci_dev *dev,
return rc; return rc;
return 0; return 0;
} }
int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
unsigned int max_vecs, unsigned int flags);
int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs, int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
unsigned int max_vecs, unsigned int flags, unsigned int max_vecs, unsigned int flags,
struct irq_affinity *affd); struct irq_affinity *affd);
@ -1586,6 +1588,13 @@ pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
return 1; return 1;
return -ENOSPC; return -ENOSPC;
} }
static inline int
pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
unsigned int max_vecs, unsigned int flags)
{
return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs,
flags, NULL);
}
static inline void pci_free_irq_vectors(struct pci_dev *dev) static inline void pci_free_irq_vectors(struct pci_dev *dev)
{ {
@ -1898,15 +1907,13 @@ pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
{ {
return -ENOSPC; return -ENOSPC;
} }
#endif /* CONFIG_PCI */
static inline int static inline int
pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs,
unsigned int max_vecs, unsigned int flags) unsigned int max_vecs, unsigned int flags)
{ {
return pci_alloc_irq_vectors_affinity(dev, min_vecs, max_vecs, flags, return -ENOSPC;
NULL);
} }
#endif /* CONFIG_PCI */
/* Include architecture-dependent settings and functions */ /* Include architecture-dependent settings and functions */