From: Sudeep Holla <sudeep.holla@arm.com>
To: Sodagudi Prasad <psodagud@codeaurora.org>
Cc: mark.rutland@arm.com, lorenzo.pieralisi@arm.com,
julien.thierry@arm.com, catalin.marinas@arm.com,
will.deacon@arm.com, linux-kernel@vger.kernel.org,
Sudeep Holla <sudeep.holla@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: PSCI version 1.1 and SYSTEM_RESET2
Date: Wed, 1 May 2019 10:49:53 +0100 [thread overview]
Message-ID: <20190501094953.GA21851@e107155-lin> (raw)
In-Reply-To: <efee74624f986a358b8986ae3085fba2@codeaurora.org>
On Tue, Apr 30, 2019 at 05:07:31PM -0700, Sodagudi Prasad wrote:
> On 2019-04-30 14:44, Sodagudi Prasad wrote:
> +Sudeep
>
> > Hi Mark/Will,
> >
> > I would like to understand whether ARM linux community have plans to
> > support PSCI version 1.1 or not.
> > PSCI_1_1 specification introduced support for SYSTEM_RESET2 command
> > and this new command helps mobile devices to SYSTEM_WARM_RESET
> > support. Rebooting devices with warm reboot helps to capture the
> > snapshot of the ram contents for post-mortem analysis.
>
> I think, there is a recent discussion from Sudeep for the SYSTEM_RESET2
> support.
> https://patchwork.kernel.org/patch/10884345/
>
This has landed in -next, and hopefully must appear in v5.2
>
> Hi Sudeep,
>
> I was going through your discussion in the below list -
> https://lore.kernel.org/lkml/d73d3580-4ec1-a281-4585-5c776fc08c79@xilinx.com/
>
> There is no provision to set up reboot mode dynamically instead kernel
> command line parameter.
> Looking for options to reboot device with warm reboot option when kernel
> crashed.
>
> panic() --> emergency_restart() --> machine_emergency_restart() -->
> machine_restart(NULL);
>
> It would nice if there is a config option to reboot the device either in
> warm or cold in the case of kernel panic.
I presume you prefer to do warm boot in case of panic to get a dump of
the memory to inspect ? If so, is kexec/kdump not the mechanism to
achieve that ?
I am just trying to understand the use case. Xilinx asked for the same
but never got to understand their use case.
--
Regards,
Sudeep
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next prev parent reply other threads:[~2019-05-01 9:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 21:44 PSCI version 1.1 and SYSTEM_RESET2 Sodagudi Prasad
2019-05-01 0:07 ` Sodagudi Prasad
2019-05-01 9:49 ` Sudeep Holla [this message]
2019-05-01 18:43 ` Sodagudi Prasad
2019-05-02 9:05 ` Sudeep Holla
2019-05-09 1:38 ` Sodagudi Prasad
2019-05-09 1:47 ` [PATCH] kernel/panic: Use SYSTEM_RESET2 command for warm reset Prasad Sodagudi
2019-05-09 9:40 ` Sudeep Holla
2019-05-16 18:29 ` Aaro Koskinen
2019-05-17 18:03 ` Sodagudi Prasad
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