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| author | Bjorn Helgaas <bhelgaas@google.com> | 2017-03-21 13:01:30 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-06-28 15:14:52 -0500 |
| commit | 675734baa361cf044033bb60594dea33d8d8da36 (patch) | |
| tree | 9431ba97ee6011b7b8d17e08db60fcdfdd049fb0 | |
| parent | 56c1af4606f04048e3ae9ab2027a708b9684ff37 (diff) | |
| download | linux-675734baa361cf044033bb60594dea33d8d8da36.tar.bz2 | |
PCI: Enable ECRC only if device supports it
John reported that an Intel QuickAssist crypto accelerator didn't work in a
Dell PowerEdge R730. The problem seems to be that we enabled ECRC when the
device doesn't support it:
85:00.0 Co-processor [0b40]: Intel Corporation DH895XCC Series QAT [8086:0435]
Capabilities: [100 v1] Advanced Error Reporting
AERCap: First Error Pointer: 00, GenCap- CGenEn+ ChkCap- ChkEn+
1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones")
exposed the problem because it applies settings from the _HPX method to all
devices, not just hot-added ones. The R730 supplies an _HPX method that
allows the kernel to enable ECRC.
Only enable ECRC if the device advertises support for it.
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1571798
Fixes: 1302fcf0d03e ("PCI: Configure *all* devices, not just hot-added ones")
Reported-by: John Mazzie <john_mazzie@dell.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
| -rw-r--r-- | drivers/pci/probe.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 8b8826b9a398..7fedfeb0871d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1704,6 +1704,11 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) /* Initialize Advanced Error Capabilities and Control Register */ pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or; + /* Don't enable ECRC generation or checking if unsupported */ + if (!(reg32 & PCI_ERR_CAP_ECRC_GENC)) + reg32 &= ~PCI_ERR_CAP_ECRC_GENE; + if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC)) + reg32 &= ~PCI_ERR_CAP_ECRC_CHKE; pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); /* |