linux-kernel - [PATCH 0/2][RFC v2] Update the cpuinfo.max when power supply changes

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-next>] [day] [month] [year] [list]

Date:   Fri,  1 Mar 2019 02:06:54 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Len Brown <len.brown@...el.com>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        yu.chen.surf@...il.com, Chen Yu <yu.c.chen@...el.com>
Subject: [PATCH 0/2][RFC v2] Update the cpuinfo.max when power supply changes

On Dell Inc. XPS13 9333, the BIOS changes the value of
MSR_IA32_MISC_ENABLE_TURBO_DISABLE at runtime (e.g., when
the power source changes), the maximum frequency of the
CPU is not updated accordingly. This is due to the policy's
cpuinfo.max is not updated when _PPC notifier fires.

Firstly we should update the cpuinfo.max in this corner case,
secondly we should broadcast the _PPC notifier to all online
CPUs to keep information consistent.

Chen Yu (2):
  ACPI: add "processor.broadcast_ppc" hook to broadcast  _PPC
  ACPI: Update cpuinfo.max after bootup if necessary

 drivers/acpi/processor_perflib.c | 16 ++++++++++++++--
 drivers/cpufreq/cpufreq.c        |  2 ++
 drivers/cpufreq/intel_pstate.c   | 15 +++++++++++++--
 3 files changed, 29 insertions(+), 4 deletions(-)

-- 
2.17.1