PCI: Calculate maximum number of buses required for VFs
An SR-IOV device can change its First VF Offset and VF Stride based on the
values of ARI Capable Hierarchy and NumVFs. The number of buses required
for all VFs is determined by NumVFs, First VF Offset, and VF Stride (see
SR-IOV spec r1.1, sec 2.1.2).
Previously pci_iov_bus_range() computed how many buses would be required by
TotalVFs, but this was based on a single NumVFs value and may not have been
the maximum for all NumVFs configurations.
Iterate over all valid NumVFs and calculate the maximum number of bus
numbers that could ever be required for VFs of this device.
[bhelgaas: changelog, compute busnr of NumVFs, not TotalVFs, remove
kerenl-doc comment marker]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index a8752c2..2ae921f 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -46,6 +46,30 @@
pci_read_config_word(dev, iov->pos + PCI_SRIOV_VF_STRIDE, &iov->stride);
}
+/*
+ * The PF consumes one bus number. NumVFs, First VF Offset, and VF Stride
+ * determine how many additional bus numbers will be consumed by VFs.
+ *
+ * Iterate over all valid NumVFs and calculate the maximum number of bus
+ * numbers that could ever be required.
+ */
+static inline u8 virtfn_max_buses(struct pci_dev *dev)
+{
+ struct pci_sriov *iov = dev->sriov;
+ int nr_virtfn;
+ u8 max = 0;
+ u8 busnr;
+
+ for (nr_virtfn = 1; nr_virtfn <= iov->total_VFs; nr_virtfn++) {
+ pci_iov_set_numvfs(dev, nr_virtfn);
+ busnr = virtfn_bus(dev, nr_virtfn - 1);
+ if (busnr > max)
+ max = busnr;
+ }
+
+ return max;
+}
+
static struct pci_bus *virtfn_add_bus(struct pci_bus *bus, int busnr)
{
struct pci_bus *child;
@@ -427,6 +451,7 @@
dev->sriov = iov;
dev->is_physfn = 1;
+ iov->max_VF_buses = virtfn_max_buses(dev);
return 0;
@@ -556,15 +581,13 @@
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_VFs - 1);
- if (busnr > max)
- max = busnr;
+ if (dev->sriov->max_VF_buses > max)
+ max = dev->sriov->max_VF_buses;
}
return max ? max - bus->number : 0;