diff options
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 b121e47402fa..5ddfc09a8d3f 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c | |||
@@ -14,6 +14,18 @@ | |||
14 | #include "pci.h" | 14 | #include "pci.h" |
15 | 15 | ||
16 | 16 | ||
17 | static inline u8 virtfn_bus(struct pci_dev *dev, int id) | ||
18 | { | ||
19 | return dev->bus->number + ((dev->devfn + dev->sriov->offset + | ||
20 | dev->sriov->stride * id) >> 8); | ||
21 | } | ||
22 | |||
23 | static inline u8 virtfn_devfn(struct pci_dev *dev, int id) | ||
24 | { | ||
25 | return (dev->devfn + dev->sriov->offset + | ||
26 | dev->sriov->stride * id) & 0xff; | ||
27 | } | ||
28 | |||
17 | static int sriov_init(struct pci_dev *dev, int pos) | 29 | static int sriov_init(struct pci_dev *dev, int pos) |
18 | { | 30 | { |
19 | int i; | 31 | int i; |
@@ -209,3 +221,27 @@ void pci_restore_iov_state(struct pci_dev *dev) | |||
209 | if (dev->is_physfn) | 221 | if (dev->is_physfn) |
210 | sriov_restore_state(dev); | 222 | sriov_restore_state(dev); |
211 | } | 223 | } |
224 | |||
225 | /** | ||
226 | * pci_iov_bus_range - find bus range used by Virtual Function | ||
227 | * @bus: the PCI bus | ||
228 | * | ||
229 | * Returns max number of buses (exclude current one) used by Virtual | ||
230 | * Functions. | ||
231 | */ | ||
232 | int pci_iov_bus_range(struct pci_bus *bus) | ||
233 | { | ||
234 | int max = 0; | ||
235 | u8 busnr; | ||
236 | struct pci_dev *dev; | ||
237 | |||
238 | list_for_each_entry(dev, &bus->devices, bus_list) { | ||
239 | if (!dev->is_physfn) | ||
240 | continue; | ||
241 | busnr = virtfn_bus(dev, dev->sriov->total - 1); | ||
242 | if (busnr > max) | ||
243 | max = busnr; | ||
244 | } | ||
245 | |||
246 | return max ? max - bus->number : 0; | ||
247 | } | ||