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

Rafael J. Wysocki
2019-07-27T12:55:20Z

On Fri, Jul 26, 2019 at 4:03 PM Kai-Heng Feng
<kai.heng.feng@canonical.com> wrote:
>
> at 04:02, Rafael J. Wysocki <rjw@rjwysocki.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.

> I am not sure how to downgrade it under Linux though.

Me neither.

> 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=mcxm8

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.