From: Dexuan Cui <decui@microsoft.com>
To: Russell King - ARM Linux admin <linux@armlinux.org.uk>
Cc: Michael Kelley <mikelley@microsoft.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"lenb@kernel.org" <lenb@kernel.org>,
"robert.moore@intel.com" <robert.moore@intel.com>,
"erik.schmauss@intel.com" <erik.schmauss@intel.com>,
Russ Dill <Russ.Dill@ti.com>,
Sebastian Capella <sebastian.capella@linaro.org>,
Pavel Machek <pavel@ucw.cz>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
KY Srinivasan <kys@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Sasha Levin <Alexander.Levin@microsoft.com>,
"olaf@aepfle.de" <olaf@aepfle.de>,
"apw@canonical.com" <apw@canonical.com>,
"jasowang@redhat.com" <jasowang@redhat.com>,
vkuznets <vkuznets@redhat.com>,
"marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com>
Subject: RE: [PATCH] ACPI: PM: Export the function acpi_sleep_state_supported()
Date: Fri, 14 Jun 2019 23:34:05 +0000 [thread overview]
Message-ID: <PU1P153MB0169C43993952984FADF1B85BFEE0@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20190614223310.pwwoefu5qdvcuaiy@shell.armlinux.org.uk>
> From: linux-hyperv-owner@vger.kernel.org
> <linux-hyperv-owner@vger.kernel.org> On Behalf Of Russell King
> On Fri, Jun 14, 2019 at 10:19:02PM +0000, Dexuan Cui wrote:
> > It looks ARM does not support the ACPI S4 state, then how do we know
> > if an ARM host supports hibernation or not?
>
> Don't forget that Linux does not support ACPI on 32-bit ARM, which is
> quite different from the situation on 64-bit ARM.
>
> arch/arm/kernel/hibernate.c is only for 32-bit ARM, and is written with
> the assumption that there is no interaction required with any firmware
> to save state, and later restore state upon resuming.
>
> Or am I missing something?
Hi Russell,
Thanks for your reply and please excuse me for my ignorance of ARM.
So 32-bit ARM Linux can hibernate even if it doesn't support ACPI, but
I guess not all 32-bit ARM machines support hibernation? If my guess
is correct, is there any standard capability bit or something that can be
used to tell if an ARM machine supports hibernation? I'm purely curious. :-)
Do you imply 64-bit ARM Linux supports ACPI and the ACPI S4 state?
If not, how can we tell if a 64-bit ARM machine supports hibernation or not?
Thanks,
-- Dexuan
next prev parent reply other threads:[~2019-06-14 23:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 18:19 [PATCH] ACPI: PM: Export the function acpi_sleep_state_supported() Dexuan Cui
2019-06-14 20:48 ` Michael Kelley
2019-06-14 22:19 ` Dexuan Cui
2019-06-14 22:33 ` Russell King - ARM Linux admin
2019-06-14 23:34 ` Dexuan Cui [this message]
2019-06-17 13:08 ` Pavel Machek
2019-06-17 13:09 ` Pavel Machek
2019-06-17 16:14 ` Lorenzo Pieralisi
2019-06-19 19:54 ` Dexuan Cui
2019-06-20 11:30 ` Pavel Machek
2019-06-21 7:15 ` Dexuan Cui
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=PU1P153MB0169C43993952984FADF1B85BFEE0@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM \
--to=decui@microsoft.com \
--cc=Alexander.Levin@microsoft.com \
--cc=Russ.Dill@ti.com \
--cc=apw@canonical.com \
--cc=erik.schmauss@intel.com \
--cc=haiyangz@microsoft.com \
--cc=jasowang@redhat.com \
--cc=kys@microsoft.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=lorenzo.pieralisi@arm.com \
--cc=marcelo.cerri@canonical.com \
--cc=mikelley@microsoft.com \
--cc=olaf@aepfle.de \
--cc=pavel@ucw.cz \
--cc=rjw@rjwysocki.net \
--cc=robert.moore@intel.com \
--cc=sebastian.capella@linaro.org \
--cc=sthemmin@microsoft.com \
--cc=vkuznets@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).