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  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]
Date:   Fri, 01 Mar 2019 09:28:19 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Ulf Hansson <ulf.hansson@...aro.org>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] drivers: firmware: psci: Announce support for OS initiated suspend mode

Quoting Ulf Hansson (2019-02-28 05:59:19)
> PSCI firmware v1.0+, supports two different modes for CPU_SUSPEND. The
> Platform Coordinated mode, which is the default and mandatory mode, while
> support for the OS initiated (OSI) mode is optional.
> 
> In some cases it's interesting for the user/developer to know if the OSI
> mode is supported by the PSCI FW. Therefore, let's print a message to the
> log, if that is the case.

I don't see anything wrong with the patch besides the potential for the
logs to wrap and the informational message to be lost, but would it be
possible to express the PSCI features that are supported in sysfs at
/sys/firmware/psci/ somehow? It may be useful for a user to know that
their firmware has PSCI support and that it has a certain set of
features available, like OSI vs. PC, or both. I don't know of any use
that userspace would have though, besides maybe the CPU state residency
counters being used by some sort of statistics collecting program or
just plain knowing that certain PSCI features are present, so perhaps it
could just be done in debugfs for now until a real user exists.

Powered by blists - more mailing lists