[PATCH v3 0/6] PowerNV PCIe Hotplug Driver Fixes

Ganesh G R ganeshgr at linux.ibm.com
Wed Jul 23 21:47:25 AEST 2025


On 7/16/25 3:01 AM, Timothy Pearson wrote:
> Hello all,
> 
> This series includes several fixes for bugs in the PowerNV PCIe hotplug
> driver that were discovered in testing with a Microsemi Switchtec PM8533
> PFX 48xG3 PCIe switch on a PowerNV system, as well as one workaround for
> PCIe switches that don't correctly implement slot presence detection
> such as the aforementioned one. Without the workaround, the switch works
> and downstream devices can be hot-unplugged, but the devices never come
> back online after being plugged in again until the system is rebooted.
> Other hotplug drivers (like pciehp_hpc) use a similar workaround.
> 
> Also included are fixes for the EEH driver to make it hotplug safe,
> and a small patch to enable all three attention indicator states per
> the PCIe specification.
> 
> Thanks,
> 
> Shawn Anastasio (2):
>    PCI: pnv_php: Properly clean up allocated IRQs on unplug
>    PCI: pnv_php: Work around switches with broken presence detection
> 
> Timothy Pearson (4):
>    powerpc/eeh: Export eeh_unfreeze_pe()
>    powerpc/eeh: Make EEH driver device hotplug safe
>    PCI: pnv_php: Fix surprise plug detection and recovery
>    PCI: pnv_php: Enable third attention indicator state
> 
>   arch/powerpc/kernel/eeh.c         |   1 +
>   arch/powerpc/kernel/eeh_driver.c  |  48 ++++--
>   arch/powerpc/kernel/eeh_pe.c      |  10 +-
>   arch/powerpc/kernel/pci-hotplug.c |   3 +
>   drivers/pci/hotplug/pnv_php.c     | 244 +++++++++++++++++++++++++++---
>   5 files changed, 263 insertions(+), 43 deletions(-)
> 
Tested the patch series for EEH and hotplug on powernv, recovery is 
working as expected, EEH changes looks good to me.
Tested-by: Ganesh Goudar <ganeshgr at linux.ibm.com>

Thanks
Ganesh


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