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Commit fb8a0d9d authored by Williams, Mitch A's avatar Williams, Mitch A Committed by David S. Miller
Browse files

pci: Add SR-IOV convenience functions and macros 



Add and export pci_num_vf to allow other subsystems to determine how many
virtual function devices are associated with an SR-IOV physical function
device.
Add macros dev_is_pci, dev_is_ps, and dev_num_vf to make it easier for
non-PCI specific code to determine SR-IOV capabilities.

Signed-off-by: default avatarMitch Williams <mitch.a.williams@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 81d54ec8

drivers/pci/iov.c

+15 −0
Original line number Diff line number Diff line
@@ -706,6 +706,21 @@ irqreturn_t pci_sriov_migration(struct pci_dev *dev) 
}

EXPORT_SYMBOL_GPL(pci_sriov_migration);



/**

 * pci_num_vf - return number of VFs associated with a PF device_release_driver

 * @dev: the PCI device

 *

 * Returns number of VFs, or 0 if SR-IOV is not enabled.

 */

int pci_num_vf(struct pci_dev *dev)

{

	if (!dev || !dev->is_physfn)

		return 0;

	else

		return dev->sriov->nr_virtfn;

}

EXPORT_SYMBOL_GPL(pci_num_vf);



static int ats_alloc_one(struct pci_dev *dev, int ps)

{

	int pos;

include/linux/pci.h

+11 −0
Original line number Diff line number Diff line
@@ -612,6 +612,9 @@ extern void pci_remove_bus_device(struct pci_dev *dev); 
extern void pci_stop_bus_device(struct pci_dev *dev);

void pci_setup_cardbus(struct pci_bus *bus);

extern void pci_sort_breadthfirst(void);

#define dev_is_pci(d) ((d)->bus == &pci_bus_type)

#define dev_is_pf(d) ((dev_is_pci(d) ? to_pci_dev(d)->is_physfn : false))

#define dev_num_vf(d) ((dev_is_pci(d) ? pci_num_vf(to_pci_dev(d)) : 0))



/* Generic PCI functions exported to card drivers */
@@ -1129,6 +1132,9 @@ static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus, 
						unsigned int devfn)

{ return NULL; }



#define dev_is_pci(d) (false)

#define dev_is_pf(d) (false)

#define dev_num_vf(d) (0)

#endif /* CONFIG_PCI */



/* Include architecture-dependent settings and functions */
@@ -1286,6 +1292,7 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar); 
extern int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);

extern void pci_disable_sriov(struct pci_dev *dev);

extern irqreturn_t pci_sriov_migration(struct pci_dev *dev);

extern int pci_num_vf(struct pci_dev *dev);

#else

static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)

{
@@ -1298,6 +1305,10 @@ static inline irqreturn_t pci_sriov_migration(struct pci_dev *dev) 
{

	return IRQ_NONE;

}

static inline int pci_num_vf(struct pci_dev *dev)

{

	return 0;

}

#endif



#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)