diff options
| -rw-r--r-- | drivers/pci/quirks.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 208aacf39329..e96c03b4e494 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -4366,6 +4366,24 @@ static int pci_quirk_qcom_rp_acs(struct pci_dev *dev, u16 acs_flags) return ret; } +static int pci_quirk_al_acs(struct pci_dev *dev, u16 acs_flags) +{ + if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT) + return -ENOTTY; + + /* + * Amazon's Annapurna Labs root ports don't include an ACS capability, + * but do include ACS-like functionality. The hardware doesn't support + * peer-to-peer transactions via the root port and each has a unique + * segment number. + * + * Additionally, the root ports cannot send traffic to each other. + */ + acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF); + + return acs_flags ? 0 : 1; +} + /* * Sunrise Point PCH root ports implement ACS, but unfortunately as shown in * the datasheet (Intel 100 Series Chipset Family PCH Datasheet, Vol. 2, @@ -4559,6 +4577,8 @@ static const struct pci_dev_acs_enabled { { PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs }, { PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs }, { PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs }, + /* Amazon Annapurna Labs */ + { PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs }, { 0 } }; |