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

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Message-ID: <CAP245DUypHRtjdF4+nRc0UX-VWqyne6NMsgoWaBxKTXFP4QAOw@mail.gmail.com>
Date:	Mon, 12 Jan 2015 11:45:39 +0530
From:	Amit Kucheria <amit.kucheria@...aro.org>
To:	George Bush <georgebush815@...il.com>
Cc:	Russ Dill <Russ.Dill@...com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"Brown, Len" <len.brown@...el.com>,
	Nicolas Pitre <nico@...aro.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Will Deacon <will.deacon@....com>, jonathan.austin@....com,
	Catalin Marinas <catalin.marinas@....com>,
	u.kleine-koenig@...gutronix.de,
	Stephen Boyd <sboyd@...eaurora.org>,
	victor.kamensky@...aro.org, r.sricharan@...com, liuj97@...il.com,
	lauraa@...eaurora.org, zhou0283@...il.com,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	linux-arm-msm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-omap@...r.kernel.org,
	Lists LAKML <linux-arm-kernel@...ts.infradead.org>,
	Sebastian Capella <capellas@...adcom.com>
Subject: Re: ARM64: hibernation: How to use hibernation/suspend-to-disk on ARMv8?

(Fixing Sebastian's email address)

On Sat, Jan 10, 2015 at 8:44 PM, George Bush <georgebush815@...il.com> wrote:
> 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?

Correct. arm64 is a separate architecture and will need to implement
something similar to SHA 603fb42a66499ab353466c7afa3d38beea20a8a9.

> 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:

I'm afraid I can't help with the memory management aspects of arm64
but you've cc'ed the right people who'd know.

> "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
>
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