iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI: Add ACS Redirect disable quirk for Intel Sunrise Point

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/pci/quirks.c
View File

@ -4553,6 +4553,30 @@ static int pci_quirk_enable_intel_spt_pch_acs(struct pci_dev *dev)
return 0; 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 { static const struct pci_dev_acs_ops {
u16 vendor; u16 vendor;
u16 device; u16 device;
@ -4564,6 +4588,7 @@ static const struct pci_dev_acs_ops {
}, },
{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, { PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
.enable_acs = pci_quirk_enable_intel_spt_pch_acs, .enable_acs = pci_quirk_enable_intel_spt_pch_acs,
.disable_acs_redir = pci_quirk_disable_intel_spt_pch_acs_redir,
}, },
}; };