[PATCHv5 0/3] Introduce the /proc/socinfo and use it to export OMAP data
Eduardo Valentin
eduardo.valentin at nokia.com
Tue May 11 10:15:28 EDT 2010
Hello all,
Here is the version 5 of the change to export OMAP data to userspace
(name, revision, id code, production id and die id).
Basically, this version is still attempting to create a new file under /proc.
It is the /proc/socinfo, which should be used to export bits which are SoC specific
(not CPU related, nor machine related).
So, differences between previous version are:
- merged patch 02/04 with 03/04 to avoid compilation breakages.
- simplified the seq_file usage by using the single_open and single_release functions
- exported a function to register a seq_operation .show callback
- adapted the changes accordingly
As usual, comments are welcome.
BR,
-------------------------------------------------------------------------------
v4:
Here is the patch set to export OMAP id code, production id and die id.
The history of this change is as follows:
1. First attempt tried adding those data under sysfs node. Original patch by
Peter De Schrijver [1]. Then, it was suggested to move it to debugfs, which was
rejected as this info is actually needed in production systems.
2. Then it has been moved to /proc/cpuinfo [2]. Then, it was suggested to do
not add this kind of info there, as it is not really CPU data.
Now, I'm sending this version which will introduce first the /proc/socinfo.
Then, following patches will add OMAP data into that node. And finally,
will add OMAP id, production and die id code.
Just for reference, I'm also pasting the previous 0/4 message:
-------------------------------------------------------------------------------
v3:
I'm resending this series with minor change in the subject prefix of patch 4/4.
Removed the PM: prefix. Everything else is same. So, I kept the v3 prefix as well.
And now v3 of this series. Basically a minor change wrt string manipulation.
No need to use strlen in so many places. Previous log for reference:
-------------------------------------------------------------------------------
v2:
Here is the version 2 of this series. Now die id is protected using
same x86 protection mechanism to hide x86 product number. Besides,
a compilation Kconfig option has been added for DIE ID as well.
Here is previous PATCH 0/4 message:
-------------------------------------------------------------------------------
v1:
This series is to continue what has been discussed several weeks ago
wrt IDCODE patch. Original patch was made by Peter and discussion is here:
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg17553.html
So, the conclusion was that IDCODE info is useful even in production systems,
and for that debugfs is not a good choice to export it. One suggestion was to
add it under /proc/cpuinfo. However this entry nowadays exports only ARM related
information.
So this series does the trick by extending the ARM /proc/cpuinfo to include
soc info data. There are a few ways to add a hook for soc specific data. But
I've decided to implement it via the simplest way I found. Basically it is
same thing which is done for system_rev, system_serial_low and system_serial_high.
Then, now we have system_soc_info, which is printed only if there is something
useful there.
As usual, comments are welcome.
-------------------------------------------------------------------------------
BR,
Eduardo Valentin (3):
procfs: Introduce socinfo under /proc
OMAP: export OMAP info under /proc/socinfo
OMAP3: export chip IDCODE, Production ID and Die ID
Documentation/filesystems/proc.txt | 1 +
Documentation/kernel-parameters.txt | 2 +
arch/arm/Kconfig | 1 +
arch/arm/mach-omap1/id.c | 31 ++++++++++---
arch/arm/mach-omap2/Kconfig | 10 ++++
arch/arm/mach-omap2/id.c | 65 +++++++++++++++++++++++++---
fs/proc/Kconfig | 7 +++
fs/proc/Makefile | 1 +
fs/proc/socinfo.c | 80 +++++++++++++++++++++++++++++++++++
include/linux/socinfo.h | 17 +++++++
10 files changed, 202 insertions(+), 13 deletions(-)
create mode 100644 fs/proc/socinfo.c
create mode 100644 include/linux/socinfo.h
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