linux-kernel - Re: [PATCH] nvme-pci: Avoid to go into d3cold if device can't use npss.

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Date:   Tue, 25 May 2021 19:49:34 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Koba Ko <koba.ko@...onical.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Henrik Juul Hansen <hjhansen2020@...il.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH] nvme-pci: Avoid to go into d3cold if device can't use
 npss.

On Wed, May 26, 2021 at 10:02:27AM +0800, Koba Ko wrote:
> On Tue, May 25, 2021 at 3:44 PM Christoph Hellwig <hch@....de> wrote:
> >
> > On Thu, May 20, 2021 at 11:33:15AM +0800, Koba Ko wrote:
> > > After resume, host can't change power state of the closed controller
> > > from D3cold to D0.
> >
> > Why?
> As per Kai-Heng said, it's a regression introduced by commit
> b97120b15ebd ("nvme-pci:
> use simple suspend when a HMB is enabled"). The affected NVMe is using HMB.

That really doesn't add up. The mentioned commit restores the driver
behavior for HMB drives that existed prior to d916b1be94b6d from kernel
5.3. Is that NVMe device broken in pre-5.3 kernels, too?