Messages in this thread Patch in this message | | | From | Shanker Donthineni <> | Subject | [PATCH v3 2/2] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs | Date | Tue, 27 Apr 2021 09:55:35 -0500 |
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On select platforms, some Nvidia GPU devices do not work with SBR. Triggering SBR would leave the device inoperable for the current system boot. It requires a system hard-reboot to get the GPU device back to normal operating condition post-SBR. For the affected devices, enable NO_BUS_RESET quirk to fix the issue.
This issue will be fixed in the next generation of hardware.
Signed-off-by: Shanker Donthineni <sdonthineni@nvidia.com> --- Changes since v1: - Split patch into 2, code for handling _RST and SBR specific quirk - The RST based reset is called as a first-class mechanism in the reset code path
drivers/pci/quirks.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 653660e3ba9e..1da80e772ee1 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -3913,6 +3913,18 @@ static int delay_250ms_after_flr(struct pci_dev *dev, int probe) return 0; } +/* + * Some Nvidia GPU devices do not work with bus reset, SBR needs to be + * prevented for those affected devices. + */ +static void quirk_nvidia_no_bus_reset(struct pci_dev *dev) +{ + if ((dev->device & 0xffc0) == 0x2340) + dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET; +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, + quirk_nvidia_no_bus_reset); + static const struct pci_dev_reset_methods pci_dev_reset_methods[] = { { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82599_SFP_VF, reset_intel_82599_sfp_virtfn }, -- 2.17.1
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