Re: [PATCH] PCI: Mark Nvidia GB10 to avoid bus reset
From: Bjorn Helgaas <helgaas@kernel.org>
Date: 2026-01-15 22:11:31
Also in:
linux-mediatek, linux-pci, lkml
On Thu, Nov 13, 2025 at 04:44:06PM +0800, Johnny Chang wrote:
From: Johnny-CC Chang <redacted> Nvidia GB10 PCIe hosts will encounter problem occasionally after SBR(secondary bus reset) is applied. Enable NO_BUS_RESET quirk for Nvidia GB10 PCIe hosts. Signed-off-by: Johnny-CC Chang <redacted>
Applied with the commit log below to pci/virtualization for v6.20, thanks! PCI: Mark Nvidia GB10 to avoid bus reset After asserting Secondary Bus Reset to downstream devices via a GB10 Root Port, the link may not retrain correctly, e.g., the link may retrain with a lower lane count or config accesses to downstream devices may fail. Prevent use of Secondary Bus Reset for devices below GB10. Signed-off-by: Johnny-CC Chang [off-list ref] [bhelgaas: drop pci_ids.h update (only used once), update commit log] Signed-off-by: Bjorn Helgaas [off-list ref] Link: https://patch.msgid.link/20251113084441.2124737-1-Johnny-CC.Chang@mediatek.com
quoted hunk ↗ jump to hunk
--- drivers/pci/quirks.c | 11 +++++++++++ include/linux/pci_ids.h | 2 ++ 2 files changed, 13 insertions(+)diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index b94264cd3833..12a10fa84c8a 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c@@ -3746,6 +3746,17 @@ static void quirk_no_bus_reset(struct pci_dev *dev) dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET; } +/* + * Nvidia GB10 PCIe hosts will encounter problem occasionally + * after SBR (secondary bus reset) is applied. + * SBR needs to be prevented for these PCIe hosts. + */ +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_GB10_GEN5_X4, + quirk_no_bus_reset); + +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_GB10_GEN4_X1, + quirk_no_bus_reset); + /* * Some NVIDIA GPU devices do not work with bus reset, SBR needs to be * prevented for those affected devices.diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h index 92ffc4373f6d..661dc1594213 100644 --- a/include/linux/pci_ids.h +++ b/include/linux/pci_ids.h@@ -1382,6 +1382,8 @@ #define PCI_DEVICE_ID_NVIDIA_GEFORCE_320M 0x08A0 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP79_SMBUS 0x0AA2 #define PCI_DEVICE_ID_NVIDIA_NFORCE_MCP89_SATA 0x0D85 +#define PCI_DEVICE_ID_NVIDIA_GB10_GEN5_X4 0x22CE +#define PCI_DEVICE_ID_NVIDIA_GB10_GEN4_X1 0x22D0 #define PCI_VENDOR_ID_IMS 0x10e0 #define PCI_DEVICE_ID_IMS_TT128 0x9128-- 2.45.2