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| author |   Logan Gunthorpe <logang@deltatee.com> | 2018-08-09 17:09:17 -0500 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2018-08-09 17:59:07 -0500 |
| commit | 10dbc9fedcf151ab794f5e22d4f34f1eff01a08f (patch) | |
| tree | 6061ec8d2ba6aa99c351c28535b10467657ead32 /drivers/pci | |
| parent | PCI: Add device-specific ACS Redirect disable infrastructure (diff) | |
| download | linux-dev-10dbc9fedcf151ab794f5e22d4f34f1eff01a08f.tar.xz linux-dev-10dbc9fedcf151ab794f5e22d4f34f1eff01a08f.zip | |
PCI: Add ACS Redirect disable quirk for Intel Sunrise Point
Intel Sunrise Point PCH hardware has an implementation of the ACS bits that
does not comply with the PCIe standard. Add a device-specific quirk,
pci_quirk_disable_intel_spt_pch_acs_redir() to disable ACS Redirection on
this system.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
[bhelgaas: changelog, split to separate patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/quirks.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 4f79631159eb..dc2ee0de3c6b 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4553,6 +4553,30 @@ static int pci_quirk_enable_intel_spt_pch_acs(struct pci_dev *dev) return 0; } +static int pci_quirk_disable_intel_spt_pch_acs_redir(struct pci_dev *dev) +{ + int pos; + u32 cap, ctrl; + + if (!pci_quirk_intel_spt_pch_acs_match(dev)) + return -ENOTTY; + + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS); + if (!pos) + return -ENOTTY; + + pci_read_config_dword(dev, pos + PCI_ACS_CAP, &cap); + pci_read_config_dword(dev, pos + INTEL_SPT_ACS_CTRL, &ctrl); + + ctrl &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_EC); + + pci_write_config_dword(dev, pos + INTEL_SPT_ACS_CTRL, ctrl); + + pci_info(dev, "Intel SPT PCH root port workaround: disabled ACS redirect\n"); + + return 0; +} + static const struct pci_dev_acs_ops { u16 vendor; u16 device; @@ -4564,6 +4588,7 @@ static const struct pci_dev_acs_ops { }, { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, .enable_acs = pci_quirk_enable_intel_spt_pch_acs, + .disable_acs_redir = pci_quirk_disable_intel_spt_pch_acs_redir, }, }; |