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

[Suzuki Poulose]

On 07/13/11 10:58, Kumar Gala wrote:
> 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@xxxxxxxxxx>
> > Cc:	Sebastian Andrzej Siewior<bigeasy@xxxxxxxxxxxxx>
> > ---
> >
> > 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?

At the moment, I have not written the code for doing the 47x TLB setup which
is slightly different from 44x.

It is in my TODO list. I don't have access to a 47x yet. I will work on it
once I get access to the board.

Thanks
Suzuki

> > 	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
> _______________________________________________
> kexec mailing list
> kexec@xxxxxxxxxxxxxxxxxxx
> http://lists.infradead.org/mailman/listinfo/kexec

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