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Commit ee8d41e5 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

pci/msi: Retrieve affinity for a vector 



Add a helper to get the affinity mask for a given PCI irq vector.  For MSI or
MSI-X vectors these are stored by the IRQ core, while for legacy interrupts
we will always return cpu_possible_map.

[hch: updated to follow the style of pci_irq_vector()]

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Cc: axboe@fb.com
Cc: keith.busch@intel.com
Cc: agordeev@redhat.com
Cc: linux-block@vger.kernel.org
Link: http://lkml.kernel.org/r/1473862739-15032-6-git-send-email-hch@lst.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 44082fd6

drivers/pci/msi.c

+31 −0
Original line number Diff line number Diff line
@@ -1270,6 +1270,37 @@ int pci_irq_vector(struct pci_dev *dev, unsigned int nr) 
}

EXPORT_SYMBOL(pci_irq_vector);



/**

 * 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).

 */

const struct cpumask *pci_irq_get_affinity(struct pci_dev *dev, int nr)

{

	if (dev->msix_enabled) {

		struct msi_desc *entry;

		int i = 0;



		for_each_pci_msi_entry(entry, dev) {

			if (i == nr)

				return entry->affinity;

			i++;

		}

		WARN_ON_ONCE(1);

		return NULL;

	} else if (dev->msi_enabled) {

		struct msi_desc *entry = first_pci_msi_entry(dev);



		if (WARN_ON_ONCE(!entry || nr >= entry->nvec_used))

			return NULL;



		return &entry->affinity[nr];

	} else {

		return cpu_possible_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);

include/linux/pci.h

+6 −0
Original line number Diff line number Diff line
@@ -1300,6 +1300,7 @@ int pci_alloc_irq_vectors(struct pci_dev *dev, unsigned int min_vecs, 
		unsigned int max_vecs, unsigned int flags);

void pci_free_irq_vectors(struct pci_dev *dev);

int pci_irq_vector(struct pci_dev *dev, unsigned int nr);

const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev, int vec);



#else

static inline int pci_msi_vec_count(struct pci_dev *dev) { return -ENOSYS; }
@@ -1342,6 +1343,11 @@ static inline int pci_irq_vector(struct pci_dev *dev, unsigned int nr) 
		return -EINVAL;

	return dev->irq;

}

static inline const struct cpumask *pci_irq_get_affinity(struct pci_dev *pdev,

		int vec)

{

	return cpu_possible_mask;

}

#endif



#ifdef CONFIG_PCIEPORTBUS