linux-kernel - Re: [Query] How to pass reboot arguments to secure firmware with PSCI spec

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Message-ID: <20140801190227.116f4c39@xhacker>
Date:	Fri, 1 Aug 2014 19:02:27 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Sudeep Holla <sudeep.holla@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Query] How to pass reboot arguments to secure firmware with
 PSCI spec

Hi Sudeep,

On Fri, 1 Aug 2014 03:21:12 -0700
Sudeep Holla <sudeep.holla@....com> wrote:

> 
> 
> On 01/08/14 11:06, Jisheng Zhang wrote:
> > Hi Catalin and Will,
> >
> > I noticed that the following commit implement reboot via. PSCI
> > SYSTEM_RESET function. So my question is how to handle the reboot
> > arguments?
> >
> 
> What reboot arguments do you want to handle ?

man 2 reboot

...

int reboot(int magic, int magic2, int cmd, void *arg);

...

I want to pass "void *arg" to secure firmware.


> 
> >
> >> static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
> >> {
> >>        invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
> >
> > How to pass cmd to secure firmware?
> >
> 
> What cmd do you want to pass ? The function id is already handled. What
> else do you want to pass ?

the "const char *cmd", usually this is the "abc" if user type "reboot abc"
under shell.

For example, android usually type "reboot recovery", the "recovery" will be
passed to next boot kernel boot args.

> 
> If you see PSCI v0.2 spec, the SYSTEM_RESET and SYSTEM_SHUTDOWN takes no
> parameters.

Yes. I know it. That's why I need your help/suggestions about how to handle
the situation above.

Thanks for your input,
Jisheng
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