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| author | Bjorn Helgaas <bhelgaas@google.com> | 2012-08-22 19:41:27 +0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-08-23 20:11:11 +0400 |
| commit | 76b57c6700e56d146938ca9dc1d553557e940d9f (patch) | |
| tree | c7bc8610faf614c6d707912cd666ac7beee2ed8b /drivers/pci/quirks.c | |
| parent | 59875ae489609b2267548dc85160c5f0f0c6f9d4 (diff) | |
| download | linux-76b57c6700e56d146938ca9dc1d553557e940d9f.tar.xz | |
PCI: Wait for pending transactions to complete before 82599 FLR
Before initiating an FLR, we should wait for completion of any outstanding
non-posted requests. See PCIe spec r3.0, sec 6.6.2.
This makes reset_intel_82599_sfp_virtfn() very similar to the generic
pcie_flr(). The only difference is that the 82599 doesn't report FLR
support in the VF Device Capability register.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/quirks.c')
| -rw-r--r-- | drivers/pci/quirks.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index aa77538c50c7..7a451ff56ecc 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3081,10 +3081,36 @@ static int reset_intel_generic_dev(struct pci_dev *dev, int probe) static int reset_intel_82599_sfp_virtfn(struct pci_dev *dev, int probe) { + int i; + u16 status; + + /* + * http://www.intel.com/content/dam/doc/datasheet/82599-10-gbe-controller-datasheet.pdf + * + * The 82599 supports FLR on VFs, but FLR support is reported only + * in the PF DEVCAP (sec 9.3.10.4), not in the VF DEVCAP (sec 9.5). + * Therefore, we can't use pcie_flr(), which checks the VF DEVCAP. + */ + if (probe) return 0; - pcie_capability_write_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); + /* Wait for Transaction Pending bit clean */ + for (i = 0; i < 4; i++) { + if (i) + msleep((1 << (i - 1)) * 100); + + pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &status); + if (!(status & PCI_EXP_DEVSTA_TRPND)) + goto clear; + } + + dev_err(&dev->dev, "transaction is not cleared; " + "proceeding with reset anyway\n"); + +clear: + pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_BCR_FLR); + msleep(100); return 0; |