linux-kernel - RE: [RFC 0/3] Add capsule update using error on close semantics

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Message-ID: <F54AEECA5E2B9541821D670476DAE19C2CC14303@PGSMSX102.gar.corp.intel.com>
Date:	Thu, 30 Apr 2015 09:30:53 +0000
From:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To:	James Bottomley <James.Bottomley@...senPartnership.com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Jones <pjones@...hat.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>
Subject: RE: [RFC 0/3] Add capsule update using error on close semantics

> -----Original Message-----
> From: James Bottomley [mailto:James.Bottomley@...senPartnership.com]
> Sent: Thursday, April 30, 2015 7:08 AM
> To: linux-efi@...r.kernel.org
> Cc: Kweh, Hock Leong; LKML; Andy Lutomirski; Greg Kroah-Hartman; Peter
> Jones
> Subject: [RFC 0/3] Add capsule update using error on close semantics
> 
> This is a straw man implementation.  The three patches firstly thread the
> needed ->flush() file op through sysfs and kernfs.  The next one extracts
> transaction buffer handling from firmware_class.c and makes it generic in a
> lib helper and the third patch adds a bare bones capsule update (I suspect
> the latter needs more work, since it doesn't implement the scatterlist).
> 
> James Bottomley (3):
>   sysfs,kernfs: add flush operation
>   firmware_class: split out transaction helpers
>   efi: add capsule update capability via sysfs
> 
>  drivers/base/firmware_class.c      | 117 ++++---------------------------
>  drivers/firmware/efi/Makefile      |   2 +-
>  drivers/firmware/efi/capsule.c     |  78 +++++++++++++++++++++
>  drivers/firmware/efi/capsule.h     |   2 +
>  drivers/firmware/efi/efi.c         |   8 +++
>  fs/kernfs/file.c                   |  16 +++++
>  fs/sysfs/file.c                    |  16 +++++
>  include/linux/kernfs.h             |   2 +
>  include/linux/sysfs.h              |   2 +
>  include/linux/transaction_helper.h |  26 +++++++
>  lib/Makefile                       |   2 +-
>  lib/transaction_helper.c           | 137
> +++++++++++++++++++++++++++++++++++++
>  12 files changed, 304 insertions(+), 104 deletions(-)  create mode 100644
> drivers/firmware/efi/capsule.c  create mode 100644
> drivers/firmware/efi/capsule.h  create mode 100644
> include/linux/transaction_helper.h
>  create mode 100644 lib/transaction_helper.c
> 
> James

Hi James,

I like the sysfs enhancement but require Greg to buy in the idea.
For the efi capsule part, Matt has implemented some APIs where
you could get the patch at http://permalink.gmane.org/gmane.linux.kernel.efi/4837.
So, I would think that leveraging the APIs that Matt has created
is a better choice.


Thanks & Regards,
Wilson