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PCI: Add ACS Redirect disable quirk for Intel Sunrise Point

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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>
This commit is contained in:
Logan Gunthorpe 2018-08-09 17:09:17 -05:00 committed by Bjorn Helgaas
parent 73c47ddef2
commit 10dbc9fedc
1 changed files with 25 additions and 0 deletions
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25
drivers/pci/quirks.c
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@ -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,
},
};