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authorYu Zhao <yu.zhao@intel.com>2009-03-20 11:25:13 +0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-03-20 10:48:24 -0700
commita28724b0fb909d247229a70761c90bb37b13366a (patch)
tree7c5332004a8f52e676076b39aa03aeb45cb03f2a /drivers/pci/iov.c
parent8c5cdb6adc6688b9b8fd82ea4a5cf4674dabad79 (diff)
downloadop-kernel-dev-a28724b0fb909d247229a70761c90bb37b13366a.zip
op-kernel-dev-a28724b0fb909d247229a70761c90bb37b13366a.tar.gz
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.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index b121e47..5ddfc09 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;
+}
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