linux-kernel - Re: [PATCH v5 2/4] e1000e: bump up timeout to wait when ME un-configures ULP mode

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Message-ID: <0a037084-d2ec-a92c-7ba4-c270072a9ad7@redhat.com>
Date:   Tue, 15 Dec 2020 13:48:51 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mario Limonciello <mario.limonciello@...l.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        intel-wired-lan@...ts.osuosl.org
Cc:     linux-kernel@...r.kernel.org, Netdev <netdev@...r.kernel.org>,
        Alexander Duyck <alexander.duyck@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Netfin <sasha.neftin@...el.com>,
        Aaron Brown <aaron.f.brown@...el.com>,
        Stefan Assmann <sassmann@...hat.com>,
        David Miller <davem@...emloft.net>, darcari@...hat.com,
        Yijun.Shen@...l.com, Perry.Yuan@...l.com,
        anthony.wong@...onical.com, Aaron Ma <aaron.ma@...onical.com>,
        Mark Pearson <markpearson@...ovo.com>
Subject: Re: [PATCH v5 2/4] e1000e: bump up timeout to wait when ME
 un-configures ULP mode

Hi,

On 12/14/20 8:29 PM, Mario Limonciello wrote:
> Per guidance from Intel ethernet architecture team, it may take
> up to 1 second for unconfiguring ULP mode.
> 
> However in practice this seems to be taking up to 2 seconds on
> some Lenovo machines.  Detect scenarios that take more than 1 second
> but less than 2.5 seconds and emit a warning on resume for those
> scenarios.
> 
> Suggested-by: Aaron Ma <aaron.ma@...onical.com>
> Suggested-by: Sasha Netfin <sasha.neftin@...el.com>
> Suggested-by: Hans de Goede <hdegoede@...hat.com>
> CC: Mark Pearson <markpearson@...ovo.com>
> Fixes: f15bb6dde738cc8fa0 ("e1000e: Add support for S0ix")
> BugLink: https://bugs.launchpad.net/bugs/1865570
> Link: https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20200323191639.48826-1-aaron.ma@canonical.com/
> Link: https://lkml.org/lkml/2020/12/13/15
> Link: https://lkml.org/lkml/2020/12/14/708
> Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans

> ---
>  drivers/net/ethernet/intel/e1000e/ich8lan.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> index 9aa6fad8ed47..fdf23d20c954 100644
> --- a/drivers/net/ethernet/intel/e1000e/ich8lan.c
> +++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c
> @@ -1240,6 +1240,9 @@ static s32 e1000_disable_ulp_lpt_lp(struct e1000_hw *hw, bool force)
>  		return 0;
>  
>  	if (er32(FWSM) & E1000_ICH_FWSM_FW_VALID) {
> +		struct e1000_adapter *adapter = hw->adapter;
> +		bool firmware_bug = false;
> +
>  		if (force) {
>  			/* Request ME un-configure ULP mode in the PHY */
>  			mac_reg = er32(H2ME);
> @@ -1248,16 +1251,23 @@ static s32 e1000_disable_ulp_lpt_lp(struct e1000_hw *hw, bool force)
>  			ew32(H2ME, mac_reg);
>  		}
>  
> -		/* Poll up to 300msec for ME to clear ULP_CFG_DONE. */
> +		/* Poll up to 2.5 seconds for ME to clear ULP_CFG_DONE.
> +		 * If this takes more than 1 second, show a warning indicating a firmware
> +		 * bug */
>  		while (er32(FWSM) & E1000_FWSM_ULP_CFG_DONE) {
> -			if (i++ == 30) {
> +			if (i++ == 250) {
>  				ret_val = -E1000_ERR_PHY;
>  				goto out;
>  			}
> +			if (i > 100 && !firmware_bug)
> +				firmware_bug = true;
>  
>  			usleep_range(10000, 11000);
>  		}
> -		e_dbg("ULP_CONFIG_DONE cleared after %dmsec\n", i * 10);
> +		if (firmware_bug)
> +			e_warn("ULP_CONFIG_DONE took %dmsec.  This is a firmware bug\n", i * 10);
> +		else
> +			e_dbg("ULP_CONFIG_DONE cleared after %dmsec\n", i * 10);
>  
>  		if (force) {
>  			mac_reg = er32(H2ME);
>