linux-kernel - Re: [PATCH V1] PCI/ASPM: Save/restore L1SS Capability for suspend/resume

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Date:   Tue, 15 Feb 2022 05:10:48 -0800 (PST)
From:   "Kenneth R. Crudup" <kenny@...ix.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
cc:     Vidya Sagar <vidyas@...dia.com>, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, hkallweit1@...il.com,
        wangxiongfeng2@...wei.com, mika.westerberg@...ux.intel.com,
        kai.heng.feng@...onical.com, chris.packham@...iedtelesis.co.nz,
        yangyicong@...ilicon.com, treding@...dia.com, jonathanh@...dia.com,
        abhsahu@...dia.com, sagupta@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com,
        "Kenneth R. Crudup" <kenny@...ix.com>
Subject: Re: [PATCH V1] PCI/ASPM: Save/restore L1SS Capability for
 suspend/resume


> On Mon, 7 Feb 2022, Bjorn Helgaas wrote:

> > If the problem really was fixed by some change elsewhere, it *should*
> > still happen on v5.11-rc1.  I think we should verify that and try to
> > figure out what the other change was.

> Yeah, not a bad idea. I'm a little busy now, but I'll cut a kernel at
> 4257f7e0, remake, and see what happens. Gimme a day or so.

So I did this- checked out a branch hard-reset to commit 4257f7e0, used my
current _defconfig on it, and built and tested it- NOW it doesn't exhibit the
NVMe-device-killing behavior I'd seen a year earlier; I'm assuming Dell must
have fixed something in the BIOS?

Anyway, I'd done an "lspci -vvvnn" before and after hibernation, if you're
interested, and a diff of same; I'll send those in subsequent E-mails.

	-Kenny

-- 
Kenneth R. Crudup / Sr. SW Engineer, Scott County Consulting, Orange County CA
View attachment "kernel-4257f7e00-pre-hibernate" of type "text/plain" (42582 bytes)

View attachment "kernel-4257f7e00-pre-post-diff" of type "text/plain" (3147 bytes)