Re: [PATCH] PCI: Add d3cold delay quirk for NVIDIA LR10 NVSwitch

[sashiko-bot@kernel.org]

> On a Supermicro HGX A100 system (X12DGO-6), each of the six LR10
> NVSwitches (10de:1af1) sits alone behind a PLX PEX 8725 (10b5:8725)
> downstream port.  "nvidia-smi -r" resets all GPUs: NVML unbinds the
> switches from the nvidia-nvswitch driver, resets each one through sysfs
> (reset_method "bus", a Secondary Bus Reset of its port) and binds them
> again.  The PCI core waits 100 ms after the link comes back, the switch
> answers config reads and the reset completes.  When nvidia-nvswitch then
> probes the switches, one fails in pci_enable_device() with
> 
>   Unable to change power state from D3cold to D0, device inaccessible
> 
> four others fail to initialize with -EIO, and the NVSwitch fabric does
> not come back.
> 
> The same systems recover every time on a kernel that sleeps 1 s after
> [ ... ]
> up the hierarchy keep the default delay.
> 
> Fixes: ac91e6980563 ("PCI: Unify delay handling for reset and resume")
> Cc: stable@vger.kernel.org
> Signed-off-by: Jennifer Chan <jenniferchan@meta.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261105201010.2297078-1-jenniferchan@meta.com?part=1