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author | Wei Yang <weiyang@linux.vnet.ibm.com> | 2015-07-29 11:52:58 +0300 |
---|---|---|
committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-09-14 18:34:17 +0300 |
commit | 70675e0b6a1ae20f8e93f9fc083d28034ad38948 (patch) | |
tree | 8c4a3b6aae3923359680668ad98fcf18f43957fb /drivers/pci | |
parent | 6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff) | |
download | linux-70675e0b6a1ae20f8e93f9fc083d28034ad38948.tar.xz |
PCI: Don't try to restore VF BARs
VF BARs are read-only zero, so updating VF BARs will not have any effect.
See the SR-IOV spec r1.1, sec 3.4.1.11.
Don't update VF BARs in pci_restore_bars().
This avoids spurious "BAR %d: error updating" messages that we see when
doing vfio pass-through after 6eb7018705de ("vfio-pci: Move idle devices to
D3hot power state").
[bhelgaas: changelog, fix whitespace]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r-- | drivers/pci/pci.c | 6 | ||||
-rw-r--r-- | drivers/pci/setup-res.c | 5 |
2 files changed, 10 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 6a9a1116f1eb..1cfb47a9a9ff 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -484,7 +484,7 @@ int pci_wait_for_pending(struct pci_dev *dev, int pos, u16 mask) } /** - * pci_restore_bars - restore a devices BAR values (e.g. after wake-up) + * pci_restore_bars - restore a device's BAR values (e.g. after wake-up) * @dev: PCI device to have its BARs restored * * Restore the BAR values for a given device, so as to make it @@ -494,6 +494,10 @@ static void pci_restore_bars(struct pci_dev *dev) { int i; + /* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */ + if (dev->is_virtfn) + return; + for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) pci_update_resource(dev, i); } diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 232f9254c11a..152de5cd1cfc 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -36,6 +36,11 @@ void pci_update_resource(struct pci_dev *dev, int resno) enum pci_bar_type type; struct resource *res = dev->resource + resno; + if (dev->is_virtfn) { + dev_warn(&dev->dev, "can't update VF BAR%d\n", resno); + return; + } + /* * Ignore resources for unimplemented BARs and unused resource slots * for 64 bit BARs. |