linux-kernel - Re: [PATCH 0/2] Fix per-policy boost behavior

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <91118802-eb8c-6225-3610-05e16270b3c4@hisilicon.com>
Date: Wed, 28 Feb 2024 10:06:17 +0800
From: Jie Zhan <zhanjie9@...ilicon.com>
To: Sibi Sankar <quic_sibis@...cinc.com>
CC: <sudeep.holla@....com>, <cristian.marussi@....com>,
	<linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
	<quic_rgottimu@...cinc.com>, <linux-arm-kernel@...ts.infradead.org>,
	<asahi@...ts.linux.dev>, <linux-pm@...r.kernel.org>,
	<dietmar.eggemann@....com>, <marcan@...can.st>, <sven@...npeter.dev>,
	<alyssa@...enzweig.io>, <rafael@...nel.org>, <viresh.kumar@...aro.org>,
	<xuwei5@...ilicon.com>
Subject: Re: [PATCH 0/2] Fix per-policy boost behavior

Hi Sibi,

Thanks for pointing this issue out.

However, I can't clearly see how the existing code fails.

cpufreq_frequency_table_cpuinfo() checks cpufreq_boost_enabled(),
and that should be already set in cpufreq_boost_trigger_state() before
calling cpufreq_boost_set_sw(), so presumably cpufreq_boost_set_sw()
is supposed to work as expected.

Can you explain this a bit further?

Cheers,
Jie

On 28/02/2024 00:53, Sibi Sankar wrote:
> Fix per-policy boost behavior by incorporating per-policy boost flag
> in the policy->max calculation and setting the correct per-policy
> boost_enabled value on devices that use cpufreq_enable_boost_support().
>
> Logs reported-by Dietmar Eggemann [1]:
>
> [1] https://lore.kernel.org/lkml/265e5f2c-9b45-420f-89b1-44369aeb8418@arm.com/
>
> Sibi Sankar (2):
>    cpufreq: Fix per-policy boost behavior on SoCs using
>      cpufreq_boost_set_sw
>    cpufreq: apple-soc: Align per-policy and global boost flags
>
>   drivers/cpufreq/apple-soc-cpufreq.c |  1 +
>   drivers/cpufreq/cpufreq.c           | 15 +++++++++------
>   drivers/cpufreq/freq_table.c        |  2 +-
>   3 files changed, 11 insertions(+), 7 deletions(-)
>