linux-kernel - Re: [PATCH v2 6/6] pci/hotplug/pnv_php: Enable third attention indicator

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Message-ID: <1841754281.1353162.1752257887865.JavaMail.zimbra@raptorengineeringinc.com>
Date: Fri, 11 Jul 2025 13:18:07 -0500 (CDT)
From: Timothy Pearson <tpearson@...torengineering.com>
To: Krishna Kumar <krishnak@...ux.ibm.com>
Cc: Bjorn Helgaas <helgaas@...nel.org>, 
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, 
	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>, 
	Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH v2 6/6] pci/hotplug/pnv_php: Enable third attention
 indicator



----- Original Message -----
> From: "Krishna Kumar" <krishnak@...ux.ibm.com>
> To: "Bjorn Helgaas" <helgaas@...nel.org>, "Timothy Pearson" <tpearson@...torengineering.com>
> Cc: "linuxppc-dev" <linuxppc-dev@...ts.ozlabs.org>, "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>, "Lukas Wunner" <lukas@...ner.de>
> Sent: Monday, July 7, 2025 3:01:00 AM
> Subject: Re: [PATCH v2 6/6] pci/hotplug/pnv_php: Enable third attention indicator

> Thanks all for the review and Thanks a bunch to Timothy for fixing the PE Freeze
> issue. The hotplug issues are like you fix N issue and N+1 th issue will come
> with new HW.
> 
> We had a meeting of around 1.5 -2.0 hr with demo, code review and log review and
> we decided to let these fixes go ahead. I am consolidating what we discussed -
> 
> 
> 1. Let these fixes go ahead as it solves wider and much needed customer issue
> and its urgently needed for time being. We have verified in live demo that
> nothing is broken from legacy flow and
> 
> PE/PHB freeze, race condition, hung, oops etc has been solved correctly.
> Basically it fixes below issues -
> 
> root-port(phb) -> switch(having4 port)--> 2 nvme devices
> 
> 1st case - only removal of EP-nvme device (surprise hotplug disables msi at root
> port), soft removal may work
> 2nd case  - If we remove switch itself (surprise hotplug disable msi at root
> port) .

Just a quick follow up to see if anything else is needed from my end before this merge can occur?

Thanks!