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| author | Yu Zhao <yu.zhao@intel.com> | 2009-03-20 11:25:13 +0800 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-03-20 10:48:24 -0700 |
| commit | a28724b0fb909d247229a70761c90bb37b13366a (patch) | |
| tree | 7c5332004a8f52e676076b39aa03aeb45cb03f2a /drivers/pci/iov.c | |
| parent | 8c5cdb6adc6688b9b8fd82ea4a5cf4674dabad79 (diff) | |
| download | linux-3.10-a28724b0fb909d247229a70761c90bb37b13366a.tar.gz linux-3.10-a28724b0fb909d247229a70761c90bb37b13366a.tar.bz2 linux-3.10-a28724b0fb909d247229a70761c90bb37b13366a.zip | |
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>
Diffstat (limited to 'drivers/pci/iov.c')
| -rw-r--r-- | drivers/pci/iov.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index b121e47402f..5ddfc09a8d3 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -14,6 +14,18 @@ #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) { int i; @@ -209,3 +221,27 @@ void pci_restore_iov_state(struct pci_dev *dev) if (dev->is_physfn) 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; +} |