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PCI/MSI: Move pci_irq_get_affinity() 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.

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
This commit is contained in:
Ahmed S. Darwish 2022-11-11 14:54:59 +01:00 committed by Thomas Gleixner
parent 18e1926b8c
commit be37b8428b
2 changed files with 43 additions and 38 deletions
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43
drivers/pci/msi/api.c
View File

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

38
drivers/pci/msi/msi.c
View File

@ -854,44 +854,6 @@ int __pci_enable_msix_range(struct pci_dev *dev,
}
}
/**
* pci_irq_get_affinity - return the affinity of a particular MSI vector
* @dev: PCI device to operate on
* @nr: device-relative interrupt vector index (0-based).
*
* @nr has the following meanings depending on the interrupt mode:
* MSI-X: The index in the MSI-X vector table
* MSI: The index of the enabled MSI vectors
* INTx: Must be 0
*
* Return: A cpumask pointer or NULL if @nr is out of range
*/
const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)
{
int idx, irq = pci_irq_vector(dev, nr);
struct msi_desc *desc;
if (WARN_ON_ONCE(irq <= 0))
return NULL;
desc = irq_get_msi_desc(irq);
/* Non-MSI does not have the information handy */
if (!desc)
return cpu_possible_mask;
/* MSI[X] interrupts can be allocated without affinity descriptor */
if (!desc->affinity)
return NULL;
/*
* MSI has a mask array in the descriptor.
* MSI-X has a single mask.
*/
idx = dev->msi_enabled ? nr : 0;
return &desc->affinity[idx].mask;
}
EXPORT_SYMBOL(pci_irq_get_affinity);
struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
{
return to_pci_dev(desc->dev);