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PCI: Add ACS quirk for Loongson PCIe

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commit 1f3303aa92e15fa273779acac2d0023609de30f1 upstream.

Loongson PCIe Root Ports don't advertise an ACS capability, but they do not
allow peer-to-peer transactions between Root Ports. Add an ACS quirk so
each Root Port can be in a separate IOMMU group.

Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20250403040756.720409-1-chenhuacai@loongson.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huacai Chen
2025-04-03 12:07:56 +08:00
committed by Greg Kroah-Hartman
parent 9895f9d9b5
commit 7f6a2d3784
1 changed files with 23 additions and 0 deletions
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23
drivers/pci/quirks.c
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@@ -4988,6 +4988,18 @@ static int pci_quirk_brcm_acs(struct pci_dev *dev, u16 acs_flags)
PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
}
static int pci_quirk_loongson_acs(struct pci_dev *dev, u16 acs_flags)
{
/*
* Loongson PCIe Root Ports don't advertise an ACS capability, but
* they do not allow peer-to-peer transactions between Root Ports.
* Allow each Root Port to be in a separate IOMMU group by masking
* SV/RR/CR/UF bits.
*/
return pci_acs_ctrl_enabled(acs_flags,
PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);
}
/*
* Wangxun 40G/25G/10G/1G NICs have no ACS capability, but on
* multi-function devices, the hardware isolates the functions by
@@ -5121,6 +5133,17 @@ static const struct pci_dev_acs_enabled {
{ PCI_VENDOR_ID_BROADCOM, 0x1762, pci_quirk_mf_endpoint_acs },
{ PCI_VENDOR_ID_BROADCOM, 0x1763, pci_quirk_mf_endpoint_acs },
{ PCI_VENDOR_ID_BROADCOM, 0xD714, pci_quirk_brcm_acs },
/* Loongson PCIe Root Ports */
{ PCI_VENDOR_ID_LOONGSON, 0x3C09, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x3C19, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x3C29, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A09, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A19, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A29, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A39, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A49, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A59, pci_quirk_loongson_acs },
{ PCI_VENDOR_ID_LOONGSON, 0x7A69, pci_quirk_loongson_acs },
/* Amazon Annapurna Labs */
{ PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, pci_quirk_al_acs },
/* Zhaoxin multi-function devices */