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PCI: Mark LSI FW643 to avoid bus reset 

Apparently the LSI / Agere FW643 can't recover after a Secondary Bus Reset
and requires a power-off or suspend/resume and rescan.

VFIO resets a device before assigning it to a VM, and the FW643 doesn't
support any other reset methods, so this problem prevented assignment of
FW643 to VMs.

Prevent use of Secondary Bus Reset for this device.

With this change, the FW643 can be assigned to VMs with VFIO.  Note that it
will not be reset, resulting in leaking state between VMs and host.

Link: https://lore.kernel.org/r/20240227131401.17913-1-edmund.raile@proton.me
Signed-off-by: Edmund Raile <edmund.raile@proton.me>
[bhelgaas: commit log, comment]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Edmund Raile 2024-02-27 13:14:18 +00:00 committed by Bjorn Helgaas
parent 6613476e22
commit 29a43dc130
1 changed files with 8 additions and 0 deletions
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8
drivers/pci/quirks.c
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@ -3765,6 +3765,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATHEROS, 0x003e, quirk_no_bus_reset);
*/
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CAVIUM, 0xa100, quirk_no_bus_reset);
/*
* Apparently the LSI / Agere FW643 can't recover after a Secondary Bus
* Reset and requires a power-off or suspend/resume and rescan. Prevent
* use of that reset.
*/
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATT, 0x5900, quirk_no_bus_reset);
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATT, 0x5901, quirk_no_bus_reset);
/*
* Some TI KeyStone C667X devices do not support bus/hot reset. The PCIESS
* automatically disables LTSSM when Secondary Bus Reset is received and