linux-kernel - Re: [PATCH v2] powerpc32: Kexec support for PPC440X chipsets

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Date:	Wed, 13 Jul 2011 00:28:36 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	"Suzuki K. Poulose" <suzuki@...ibm.com>
Cc:	Benjammin Herrenschmidt <benh@...nel.crashing.org>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	linux ppc dev <linuxppc-dev@...ts.ozlabs.org>,
	kexec <kexec@...ts.infradead.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH v2] powerpc32: Kexec support for PPC440X chipsets


On Jul 12, 2011, at 1:44 AM, Suzuki K. Poulose wrote:

> Changes from V1: Uses a tmp mapping in the other address space to setup
> 		 the 1:1 mapping (suggested by Sebastian Andrzej Siewior).
> 
> Note: Should we do the same for kernel entry code for PPC44x ?
> 
> This patch adds kexec support for PPC440 based chipsets.This work is based
> on the KEXEC patches for FSL BookE.
> 
> The FSL BookE patch and the code flow could be found at the link below:
> 
> 	http://patchwork.ozlabs.org/patch/49359/
> 
> Steps:
> 
> 1) Invalidate all the TLB entries except the one this code is run from
> 2) Create a tmp mapping for our code in the other address space and jump to it
> 3) Invalidate the entry we used
> 4) Create a 1:1 mapping for 0-2GiB in blocks of 256M
> 5) Jump to the new 1:1 mapping and invalidate the tmp mapping
> 
> I have tested this patches on Ebony, Sequoia boards and Virtex on QEMU.
> It would be great if somebody could test this on the other boards.
> 
> Signed-off-by: 	Suzuki Poulose <suzuki@...ibm.com>
> Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> ---
> 
> arch/powerpc/Kconfig             |    2 
> arch/powerpc/include/asm/kexec.h |    2 
> arch/powerpc/kernel/misc_32.S    |  170 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 172 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 423145a6..d04fae0 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -349,7 +349,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
> 
> config KEXEC
> 	bool "kexec system call (EXPERIMENTAL)"
> -	depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL
> +	depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP && !47x)) && EXPERIMENTAL

Is there something special about 47x that its not supported?

> 	help
> 	  kexec is a system call that implements the ability to shutdown your
> 	  current kernel, and to start another kernel.  It is like a reboot

- k--
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