linux-kernel - Re: [PATCH v4 0/8] Nvram-to-pstore

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Date:	Wed, 19 Jun 2013 16:15:03 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com>
cc:	linuxppc-dev@...abs.org, paulus@...ba.org,
	linux-kernel@...r.kernel.org, benh@...nel.crashing.org,
	jkenisto@...ux.vnet.ibm.com, tony.luck@...el.com,
	mahesh@...ux.vnet.ibm.com, cbouatmailru@...il.com, anton@...ba.org,
	ccross@...roid.com, keescook@...omium.org
Subject: Re: [PATCH v4 0/8] Nvram-to-pstore

Aruna Balakrishnaiah <aruna@...ux.vnet.ibm.com> wrote:
> Currently the kernel provides the contents of p-series NVRAM only as a
> simple stream of bytes via /dev/nvram, which must be interpreted in user
> space by the nvram command in the powerpc-utils package. This patch set
> exploits the pstore subsystem to expose each partition in NVRAM as a
> separate file in /dev/pstore. For instance, Oops messages will be stored
> in a file named [dmesg-nvram-2].
> 
> Changes from v3:
> 	- Change filename prefix for of-config and common partition
> 
> Changes from v2:
> 	- Fix renaming of pstore type ids in nvram.c
> 
> Changes from v1:
> 	- Reduce #ifdefs by and remove forward declarations of pstore callbacks
> 	- Handle return value of nvram_write_os_partition
> 	- Remove empty pstore callbacks and register pstore only when pstore
> 	  is configured

When booted on pHyp, I see /dev/nvram but not /dev/pstore, even if I
turn on CONFIG_PSTORE.  Is there something else I need to add?

Should we update pseries_defconfig to include CONFIG_PSTORE (which it
doesn't include currently)?  Maybe turn on panic/oops via
CONFIG_PSTORE_RAM too?

Other than that, the series looks clean.  It's passes my build and boot
tests.

I've not reviewed the contents of the patches.

Mikey

> ---
> 
> Aruna Balakrishnaiah (8):
>       powerpc/pseries: Remove syslog prefix in uncompressed oops text
>       powerpc/pseries: Add version and timestamp to oops header
>       powerpc/pseries: Introduce generic read function to read nvram-partitions
>       powerpc/pseries: Read/Write oops nvram partition via pstore
>       powerpc/pseries: Read rtas partition via pstore
>       powerpc/pseries: Distinguish between a os-partition and non-os partition
>       powerpc/pseries: Read of-config partition via pstore
>       powerpc/pseries: Read common partition via pstore
> 
> 
>  arch/powerpc/platforms/pseries/nvram.c |  353 +++++++++++++++++++++++++++-----
>  fs/pstore/inode.c                      |    9 +
>  include/linux/pstore.h                 |    4 
>  3 files changed, 313 insertions(+), 53 deletions(-)
> 
> -- 
> 
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev@...ts.ozlabs.org
> https://lists.ozlabs.org/listinfo/linuxppc-dev
> 
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