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

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Date:   Mon, 29 Jul 2019 15:51:50 +0000
From:   <Mario.Limonciello@...l.com>
To:     <rafael@...nel.org>, <kai.heng.feng@...onical.com>
CC:     <rjw@...ysocki.net>, <kbusch@...nel.org>, <keith.busch@...el.com>,
        <hch@....de>, <sagi@...mberg.me>, <linux-nvme@...ts.infradead.org>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [Regression] Commit "nvme/pci: Use host managed power state for
 suspend" has problems

> -----Original Message-----
> From: Rafael J. Wysocki <rafael@...nel.org>
> Sent: Saturday, July 27, 2019 7:55 AM
> To: Kai-Heng Feng
> Cc: Rafael J. Wysocki; Keith Busch; Busch, Keith; Christoph Hellwig; Sagi Grimberg;
> linux-nvme@...ts.infradead.org; Limonciello, Mario; Linux PM; LKML
> Subject: Re: [Regression] Commit "nvme/pci: Use host managed power state for
> suspend" has problems
> 
> 
> [EXTERNAL EMAIL]
> 
> On Fri, Jul 26, 2019 at 4:03 PM Kai-Heng Feng
> <kai.heng.feng@...onical.com> wrote:
> >
> > at 04:02, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> >
> > > On Thursday, July 25, 2019 9:52:59 PM CEST Keith Busch wrote:
> > >> On Thu, Jul 25, 2019 at 09:48:57PM +0200, Rafael J. Wysocki wrote:
> > >>> NVME Identify Controller:
> > >>> vid     : 0x1c5c
> > >>> ssvid   : 0x1c5c
> > >>> sn      : MS92N171312902J0N
> > >>> mn      : PC401 NVMe SK hynix 256GB
> > >>> fr      : 80007E00
> > >>> rab     : 2
> > >>> ieee    : ace42e
> > >>> cmic    : 0
> > >>> mdts    : 5
> > >>> cntlid  : 1
> > >>> ver     : 10200
> > >>> rtd3r   : 7a120
> > >>> rtd3e   : 1e8480
> > >>> oaes    : 0x200
> > >>> ctratt  : 0
> > >>> oacs    : 0x17
> > >>> acl     : 7
> > >>> aerl    : 3
> > >>> frmw    : 0x14
> > >>> lpa     : 0x2
> > >>> elpe    : 255
> > >>> npss    : 4
> > >>> avscc   : 0x1
> > >>> apsta   : 0x1
> > >>> wctemp  : 352
> > >>> cctemp  : 354
> > >>> mtfa    : 0
> > >>> hmpre   : 0
> > >>> hmmin   : 0
> > >>> tnvmcap : 0
> > >>> unvmcap : 0
> > >>> rpmbs   : 0
> > >>> edstt   : 10
> > >>> dsto    : 0
> > >>> fwug    : 0
> > >>> kas     : 0
> > >>> hctma   : 0
> > >>> mntmt   : 0
> > >>> mxtmt   : 0
> > >>> sanicap : 0
> > >>> hmminds : 0
> > >>> hmmaxd  : 0
> > >>> nsetidmax : 0
> > >>> anatt   : 0
> > >>> anacap  : 0
> > >>> anagrpmax : 0
> > >>> nanagrpid : 0
> > >>> sqes    : 0x66
> > >>> cqes    : 0x44
> > >>> maxcmd  : 0
> > >>> nn      : 1
> > >>> oncs    : 0x1f
> > >>> fuses   : 0x1
> > >>> fna     : 0
> > >>> vwc     : 0x1
> > >>> awun    : 7
> > >>> awupf   : 7
> > >>> nvscc   : 1
> > >>> acwu    : 7
> > >>> sgls    : 0
> > >>> mnan    : 0
> > >>> subnqn  :
> > >>> ioccsz  : 0
> > >>> iorcsz  : 0
> > >>> icdoff  : 0
> > >>> ctrattr : 0
> > >>> msdbd   : 0
> > >>> ps    0 : mp:6.00W operational enlat:5 exlat:5 rrt:0 rrl:0
> > >>>           rwt:0 rwl:0 idle_power:- active_power:-
> > >>> ps    1 : mp:3.80W operational enlat:30 exlat:30 rrt:1 rrl:1
> > >>>           rwt:1 rwl:1 idle_power:- active_power:-
> > >>> ps    2 : mp:2.40W operational enlat:100 exlat:100 rrt:2 rrl:2
> > >>>           rwt:2 rwl:2 idle_power:- active_power:-
> > >>> ps    3 : mp:0.0700W non-operational enlat:1000 exlat:1000 rrt:3 rrl:3
> > >>>           rwt:3 rwl:3 idle_power:- active_power:-
> > >>> ps    4 : mp:0.0070W non-operational enlat:1000 exlat:5000 rrt:3 rrl:3
> > >>>           rwt:3 rwl:3 idle_power:- active_power:-
> > >>
> > >> Hm, nothing stands out as something we can use to determine if we should
> > >> skip the nvme specific settings or allow D3. I've no other ideas at the
> > >> moment for what we may check.
> > >
> > > Well, do ASPM settings matter here?
> >
> > Seems like it's a regression in the firmware.
> >
> > The issue happens in version 80007E00 but not version 80006E00.
> 
> So you mean the NVMe firmware, to be entirely precise.

Yes.

> 
> > I am not sure how to downgrade it under Linux though.
> 
> Me neither.

I'll ask the storage team to ask Hynix to make both these FW available on LVFS.
Fwupd can upgrade and downgrade firmware when the binaries are made available.

They could potentially be pulled directly out of the Windows executables too, but I don't
know how to identify them myself.

> 
> > The firmware changelog [1] is very interesting:
> > - Improves the performance of the solid-state drive (SSD) by distributing
> > power into the SSD efficiently according to the power state of the system.
> >
> > [1]
> >
> https://www.dell.com/support/home/us/en/04/drivers/driversdetails?driverid=m
> cxm8
> 
> Huh.
> 
> It looks like something else prevents the PCH on my 9380 from reaching
> the right state for S0ix, though.  I still need to find out what it
> is.