linux-kernel - Re: [PATCH v3 0/6] PowerNV PCIe Hotplug Driver Fixes

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Message-ID: <4193678b-6da2-4a26-99d4-f983cccfbfd1@linux.ibm.com>
Date: Wed, 23 Jul 2025 17:17:25 +0530
From: Ganesh G R <ganeshgr@...ux.ibm.com>
To: Timothy Pearson <tpearson@...torengineering.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        christophe leroy <christophe.leroy@...roup.eu>,
        Naveen N Rao <naveen@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Anastasio <sanastasio@...torengineering.com>
Subject: Re: [PATCH v3 0/6] PowerNV PCIe Hotplug Driver Fixes

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@...ux.ibm.com>

Thanks
Ganesh