linux-kernel - Re: [Regression] Commit "nvme/pci: Use host managed power state for suspend" has problems

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Date:   Thu, 1 Aug 2019 14:22:51 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Mario Limonciello <Mario.Limonciello@...l.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Busch, Keith" <keith.busch@...el.com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme <linux-nvme@...ts.infradead.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rajat Jain <rajatja@...gle.com>
Subject: Re: [Regression] Commit "nvme/pci: Use host managed power state for
 suspend" has problems

On Thu, Aug 01, 2019 at 02:05:54AM -0700, Kai-Heng Feng wrote:
> at 06:33, Rafael J. Wysocki <rafael@...nel.org> wrote:
> > On Thu, Aug 1, 2019 at 12:22 AM Keith Busch <kbusch@...nel.org> wrote:
> >
> >> In which case we do need to reintroduce the HMB handling.
> >
> > Right.
> 
> The patch alone doesn’t break HMB Toshiba NVMe I tested. But I think it’s  
> still safer to do proper HMB handling.

Spec requires host request controller release HMB for D3cold. I suspect
you're only getting to D3hot.