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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: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Williams, Mitch A 2010-02-10 01:43:04 +00:00 committed by David S. Miller
parent 81d54ec847
commit fb8a0d9d1b
2 changed files with 26 additions and 0 deletions
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15
drivers/pci/iov.c
View File

@ -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;

11
include/linux/pci.h
View File

@ -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)