Re: [Intel-wired-lan] [PATCH] e1000e: Add ADP_I219_LM17 to ME S0ix blacklist

[Jia Liu]

On Wed, Jan 18, 2023 at 1:20 PM Neftin, Sasha <sasha.neftin@xxxxxxxxx> wrote:
>
> On 1/17/2023 21:34, Jacob Keller wrote:
> >
> >
> > On 1/17/2023 2:26 AM, Jiajia Liu wrote:
> >> I219 on HP EliteOne 840 All in One cannot work after s2idle resume
> >> when the link speed is Gigabit, Wake-on-LAN is enabled and then set
> >> the link down before suspend. No issue found when requesting driver
> >> to configure S0ix. Add workround to let ADP_I219_LM17 use the dirver
> >> configured S0ix.
> >>
> >> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216926
> >> Signed-off-by: Jiajia Liu <liujia6264@xxxxxxxxx>
> >> ---
> >>
> >> It's regarding the bug above, it looks it's causued by the ME S0ix.
> >> And is there a method to make the ME S0ix path work?
> No. This is a fragile approach. ME must get the message from us
> (unconfigure the device from s0ix). Otherwise, ME will continue to
> access LAN resources and the controller could get stuck.
> I see two ways:
> 1. you always can skip s0ix flow by priv_flag
> 2. Especially in this case (HP platform) - please, contact HP (what is
> the ME version on this system, and how was it released...). HP will open
> a ticket with Intel. (then we can involve the ME team)

HP released BIOS including ME firmware on their website HP.com at
https://support.hp.com/my-en/drivers/selfservice/hp-eliteone-840-23.8-inch-g9-all-in-one-desktop-pc/2101132389.
There is upgrade interface on the BIOS setup menu which can connect
HP.com and upgrade to newer BIOS.

The initial ME version was v16.0.15.1735 from BIOS 02.03.04.
Then I upgraded to the latest one v16.1.25.1932v3 from BIOS 02.06.01
released on Nov 28, 2022. Both of them can produce this issue.

I have only one setup. Is it possible to try on your system which has the
same I219-LM to see if it's platform specific or not?

> >>
> >
> > No idea. It does seem better to disable S0ix if it doesn't work properly
> > first though...
> >
> >>   drivers/net/ethernet/intel/e1000e/netdev.c | 25 ++++++++++++++++++++++
> >>   1 file changed, 25 insertions(+)
> >>
> >> diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
> >> index 04acd1a992fa..7ee759dbd09d 100644
> >> --- a/drivers/net/ethernet/intel/e1000e/netdev.c
> >> +++ b/drivers/net/ethernet/intel/e1000e/netdev.c
> >> @@ -6330,6 +6330,23 @@ static void e1000e_flush_lpic(struct pci_dev *pdev)
> >>      pm_runtime_put_sync(netdev->dev.parent);
> >>   }
> >>
> >> +static u16 me_s0ix_blacklist[] = {
> >> +    E1000_DEV_ID_PCH_ADP_I219_LM17,
> >> +    0
> >> +};
> >> +
> >> +static bool e1000e_check_me_s0ix_blacklist(const struct e1000_adapter *adapter)
> >> +{
> >> +    u16 *list;
> >> +
> >> +    for (list = me_s0ix_blacklist; *list; list++) {
> >> +            if (*list == adapter->pdev->device)
> >> +                    return true;
> >> +    }
> >> +
> >> +    return false;
> >> +}
> >
> > The name of this function seems odd..? "check_me"? It also seems like we
> > could just do a simple switch/case on the device ID or similar.
> >
> > Maybe: "e1000e_device_supports_s0ix"?
> >
> >> +
> >>   /* S0ix implementation */
> >>   static void e1000e_s0ix_entry_flow(struct e1000_adapter *adapter)
> >>   {
> >> @@ -6337,6 +6354,9 @@ static void e1000e_s0ix_entry_flow(struct e1000_adapter *adapter)
> >>      u32 mac_data;
> >>      u16 phy_data;
> >>
> >> +    if (e1000e_check_me_s0ix_blacklist(adapter))
> >> +            goto req_driver;
> >> +
> >>      if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID &&
> >>          hw->mac.type >= e1000_pch_adp) {
> >>              /* Request ME configure the device for S0ix */
> >
> >
> > The related code also seems to already perform some set of mac checks
> > here...
> >
> >> @@ -6346,6 +6366,7 @@ static void e1000e_s0ix_entry_flow(struct e1000_adapter *adapter)
> >>              trace_e1000e_trace_mac_register(mac_data);
> >>              ew32(H2ME, mac_data);
> >>      } else {
> >> +req_driver:>                /* Request driver configure the device to S0ix */
> >>              /* Disable the periodic inband message,
> >>               * don't request PCIe clock in K1 page770_17[10:9] = 10b
> >> @@ -6488,6 +6509,9 @@ static void e1000e_s0ix_exit_flow(struct e1000_adapter *adapter)
> >>      u16 phy_data;
> >>      u32 i = 0;
> >>
> >> +    if (e1000e_check_me_s0ix_blacklist(adapter))
> >> +            goto req_driver;
> >> +
> >
> > Why not just combine this check into the statement below rather than
> > adding a goto?
> >
> >>      if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID &&
> >>          hw->mac.type >= e1000_pch_adp) {
> >>              /* Keep the GPT clock enabled for CSME */
> >> @@ -6523,6 +6547,7 @@ static void e1000e_s0ix_exit_flow(struct e1000_adapter *adapter)
> >>              else
> >>                      e_dbg("DPG_EXIT_DONE cleared after %d msec\n", i * 10);
> >>      } else {
> >> +req_driver:
> >>              /* Request driver unconfigure the device from S0ix */
> >>
> >>              /* Disable the Dynamic Power Gating in the MAC */
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>