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PCI: Add ACS quirk for Zhaoxin Root/Downstream Ports

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commit 299bd044a6 upstream.

Many Zhaoxin Root Ports and Switch Downstream Ports do provide ACS-like
capability but have no ACS Capability Structure.  Peer-to-Peer transactions
could be blocked between these ports, so add quirk so devices behind them
could be assigned to different IOMMU group.

Link: https://lore.kernel.org/r/20200327091148.5190-4-RaymondPang-oc@zhaoxin.com
Signed-off-by: Raymond Pang <RaymondPang-oc@zhaoxin.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Raymond Pang
2020-03-27 17:11:48 +08:00
committed by Greg Kroah-Hartman
parent 17d166e953
commit 684dba87fd
1 changed files with 25 additions and 0 deletions
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25
drivers/pci/quirks.c
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@@ -4370,6 +4370,29 @@ static int pci_acs_ctrl_enabled(u16 acs_ctrl_req, u16 acs_ctrl_ena)
return 0;
}
/*
* Many Zhaoxin Root Ports and Switch Downstream Ports have no ACS capability.
* But the implementation could block peer-to-peer transactions between them
* and provide ACS-like functionality.
*/
static int pci_quirk_zhaoxin_pcie_ports_acs(struct pci_dev *dev, u16 acs_flags)
{
if (!pci_is_pcie(dev) ||
((pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) &&
(pci_pcie_type(dev) != PCI_EXP_TYPE_DOWNSTREAM)))
return -ENOTTY;
switch (dev->device) {
case 0x0710 ... 0x071e:
case 0x0721:
case 0x0723 ... 0x0732:
return pci_acs_ctrl_enabled(acs_flags,
PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
}
return false;
}
/*
* AMD has indicated that the devices below do not support peer-to-peer
* in any system where they are found in the southbridge with an AMD
@@ -4772,6 +4795,8 @@ static const struct pci_dev_acs_enabled {
{ PCI_VENDOR_ID_ZHAOXIN, 0x3038, pci_quirk_mf_endpoint_acs },
{ PCI_VENDOR_ID_ZHAOXIN, 0x3104, pci_quirk_mf_endpoint_acs },
{ PCI_VENDOR_ID_ZHAOXIN, 0x9083, pci_quirk_mf_endpoint_acs },
/* Zhaoxin Root/Downstream Ports */
{ PCI_VENDOR_ID_ZHAOXIN, PCI_ANY_ID, pci_quirk_zhaoxin_pcie_ports_acs },
{ 0 }
};