linux-kernel - ARM64: hibernation: How to use hibernation/suspend-to-disk on ARMv8?

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Message-ID: <CADcZZT+nQ_0LfurU+z5wLC_OxNhEs6n0kCoLSkfoFCDqyOu04g@mail.gmail.com>
Date:	Sat, 10 Jan 2015 23:14:33 +0800
From:	George Bush <georgebush815@...il.com>
To:	sebastian.capella@...aro.org, Russ.Dill@...com, rjw@...ysocki.net,
	linux@....linux.org.uk, len.brown@...el.com, nico@...aro.org,
	santosh.shilimkar@...com, will.deacon@....com,
	jonathan.austin@....com, catalin.marinas@....com,
	u.kleine-koenig@...gutronix.de, sboyd@...eaurora.org,
	victor.kamensky@...aro.org, r.sricharan@...com, liuj97@...il.com,
	lauraa@...eaurora.org, zhou0283@...il.com
Cc:	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org, linux-omap@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: ARM64: hibernation: How to use hibernation/suspend-to-disk on ARMv8?

Hi all

I notice we have hibernation.c in arm/kernel, however, I don't find it in arm64.
Does it mean arm64 do not support hibernation/suspend-to-disk function?

I tried some path to search the reason, but found nothing, they all say arm64
has the backward compatibility. So I send this email to the community and
hope to get the reason.
Thanks!

I ported the arm hibernation.c to arm64/kernel(with LP64), but failed in a
strange way. When I do resume, the arch_restore_image() get a page_fault
when it calls the copy_page(), like:
"Unable to handle kernel paging request at virtual address 0xffffffbc055c3fa8"
I'm sure the copy_page()'s parameters is in the memory area, why and how
I get the strange address 0xffffffbc055c3fa8?

vmalloc:         0xffffff8000000000 - 0xffffffbb00000000
vmemmap:     0xffffffbc01400000 - 0xffffffbc04f88000
modules:       0xffffffbffc000000   -  0xffffffc000000000
memory:        0xffffffc000000000 - 0xffffffc0be800000

Look forward to your reply, thanks!
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