PCI: Print more info in sriov_enable() error message

If we don't have space for all the bus numbers required to enable VFs,
print the largest bus number required and the range available.

No functional change; improved error message only.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 4b3a4ea..c4c33ea 100644 (file)
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -180,6 +180,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
        struct pci_dev *pdev;
        struct pci_sriov *iov = dev->sriov;
        int bars = 0;
+       u8 bus;
 
        if (!nr_virtfn)
                return 0;
@@ -216,8 +217,10 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
        iov->offset = offset;
        iov->stride = stride;
 
-       if (virtfn_bus(dev, nr_virtfn - 1) > dev->bus->busn_res.end) {
-               dev_err(&dev->dev, "SR-IOV: bus number out of range\n");
+       bus = virtfn_bus(dev, nr_virtfn - 1);
+       if (bus > dev->bus->busn_res.end) {
+               dev_err(&dev->dev, "can't enable %d VFs (bus %02x out of range of %pR)\n",
+                       nr_virtfn, bus, &dev->bus->busn_res);
                return -ENOMEM;
        }