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PCI: reserve bus range for SR-IOV device 

Reserve the bus number range used by the Virtual Function when
pcibios_assign_all_busses() returns true.

Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Yu Zhao 2009-03-20 11:25:13 +08:00 committed by Jesse Barnes
parent 8c5cdb6adc
commit a28724b0fb
3 changed files with 44 additions and 0 deletions
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36
drivers/pci/iov.c
View File

@ -14,6 +14,18 @@
#include "pci.h" #include "pci.h"
static inline u8 virtfn_bus(struct pci_dev *dev, int id)
{
return dev->bus->number + ((dev->devfn + dev->sriov->offset +
dev->sriov->stride * id) >> 8);
}
static inline u8 virtfn_devfn(struct pci_dev *dev, int id)
{
return (dev->devfn + dev->sriov->offset +
dev->sriov->stride * id) & 0xff;
}
static int sriov_init(struct pci_dev *dev, int pos) static int sriov_init(struct pci_dev *dev, int pos)
{ {
int i; int i;
@ -209,3 +221,27 @@ void pci_restore_iov_state(struct pci_dev *dev)
if (dev->is_physfn) if (dev->is_physfn)
sriov_restore_state(dev); sriov_restore_state(dev);
} }
/**
* pci_iov_bus_range - find bus range used by Virtual Function
* @bus: the PCI bus
*
* Returns max number of buses (exclude current one) used by Virtual
* Functions.
*/
int pci_iov_bus_range(struct pci_bus *bus)
{
int max = 0;
u8 busnr;
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
if (!dev->is_physfn)
continue;
busnr = virtfn_bus(dev, dev->sriov->total - 1);
if (busnr > max)
max = busnr;
}
return max ? max - bus->number : 0;
}

5
drivers/pci/pci.h
View File

@ -223,6 +223,7 @@ extern void pci_iov_release(struct pci_dev *dev);
extern int pci_iov_resource_bar(struct pci_dev *dev, int resno, extern int pci_iov_resource_bar(struct pci_dev *dev, int resno,
enum pci_bar_type *type); enum pci_bar_type *type);
extern void pci_restore_iov_state(struct pci_dev *dev); extern void pci_restore_iov_state(struct pci_dev *dev);
extern int pci_iov_bus_range(struct pci_bus *bus);
#else #else
static inline int pci_iov_init(struct pci_dev *dev) static inline int pci_iov_init(struct pci_dev *dev)
{ {
@ -240,6 +241,10 @@ static inline int pci_iov_resource_bar(struct pci_dev *dev, int resno,
static inline void pci_restore_iov_state(struct pci_dev *dev) static inline void pci_restore_iov_state(struct pci_dev *dev)
{ {
} }
static inline int pci_iov_bus_range(struct pci_bus *bus)
{
return 0;
}
#endif /* CONFIG_PCI_IOV */ #endif /* CONFIG_PCI_IOV */
#endif /* DRIVERS_PCI_H */ #endif /* DRIVERS_PCI_H */

3
drivers/pci/probe.c
View File

@ -1085,6 +1085,9 @@ unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
for (devfn = 0; devfn < 0x100; devfn += 8) for (devfn = 0; devfn < 0x100; devfn += 8)
pci_scan_slot(bus, devfn); pci_scan_slot(bus, devfn);
/* Reserve buses for SR-IOV capability. */
max += pci_iov_bus_range(bus);
/* /*
* After performing arch-dependent fixup of the bus, look behind * After performing arch-dependent fixup of the bus, look behind
* all PCI-to-PCI bridges on this bus. * all PCI-to-PCI bridges on this bus.