Gentle ping?
Huacai
On Thu, Apr 3, 2025 at 12:08 PM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote:
>
> 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.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Xianglai Li <lixianglai@xxxxxxxxxxx>
> Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> ---
> V2: Add more device ids.
>
> drivers/pci/quirks.c | 23 +++++++++++++++++++++++
> 1 file changed, 23 insertions(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 8d610c17e0f2..eee96ad03614 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -4995,6 +4995,18 @@ 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
> @@ -5128,6 +5140,17 @@ 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 */
> --
> 2.47.1
>
