linux-kernel - Re: [GIT PULL] PCI fixes for v4.10

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Date:   Thu, 9 Feb 2017 10:46:13 -0800
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Lukas Wunner <lukas@...ner.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Christoph Hellwig <hch@....de>,
        Yinghai Lu <yinghai@...nel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Keith Busch <keith.busch@...el.com>, ashok.raj@...el.com
Subject: Re: [GIT PULL] PCI fixes for v4.10

Hi Bjorn/Lucas

I did a lspci and captured after a fresh reboot on the slot before 
attempting a power off via sysfs.

lspci-at-poweron - values after a cold reset poweron.
lspci-aft-poweroff - values after a echo 0 > power
lspci-aft-poweron - values after a echo 1 > power

i would expect most or all of those values to stay same between poweron
and after the next sysfs managed poweron. Would be worth taking a look and see 
if we have any escapes.

Cheers,
Ashok

On Thu, Feb 09, 2017 at 10:23:28AM -0800, Raj, Ashok wrote:
> Thanks Bjorn,
> 
> With the fixes below, managed add remove via sysfs seems to work on my
> SKX system. 
> 
> I'm not familiar with runtime PM aspects, just started looking into it 
> after this one. There seems some interactions with ASPM and how we handle 
> devices that support ARI for e.g.
> 
> For hotplug, we have a good set of tests to check coverage. That matrix
> might need to be expanded for runtime PM interactions.
> 
> Cheers,
> Ashok
> 

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