linux-kernel - Re: [RFC] persistent store (version 2) (part 1 of 2)

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Message-Id: <4cf68d6f178373258a@agluck-desktop.sc.intel.com>
Date:	Wed, 01 Dec 2010 10:01:19 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	greg@...ah.com, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Cc:	tglx@...utronix.de, mingo@...e.hu, akpm@...ux-foundation.org,
	ying.huang@...el.com, "Borislav Petkov" <bp@...en8.de>,
	"David Miller" <davem@...emloft.net>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Jim Keniston" <jkenisto@...ux.vnet.ibm.com>,
	"Kyungmin Park" <kmpark@...radead.org>,
	"Geert Uytterhoeven" <geert@...ux-m68k.org>
Subject: Re: [RFC] persistent store (version 2) (part 1 of 2)

> As you are adding new sysfs files, you are required to document them in
> Documentation/ABI/ as well.

Is this what you need?

-Tony

---

diff --git a/Documentation/ABI/testing/sysfs-pstore b/Documentation/ABI/testing/sysfs-pstore
new file mode 100644
index 0000000..083fcf7
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-pstore
@@ -0,0 +1,35 @@
+Where:		/sys/firmware/pstore/...
+Date:		January 2011
+Kernel Version: 2.6.38
+Contact:	tony.luck@...el.com
+Description:	Generic interface to platform dependent persistent storage.
+
+		Platforms that provide a mechanism to preserve some data
+		across system reboots can register with this driver to
+		provide a generic interface to show records captured in
+		the dying moments.  In the case of a panic() the last part
+		of the console log is captured, but other interesting
+		data can also be saved.
+
+		$ ls -l /sys/firmware/pstore
+		total 0
+		-r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-1
+		--w------- 1 root root    0 Nov 30 15:38 erase
+
+		Different users of this interface will result in different
+		filename prefixes.  Currently two are defined:
+
+		"dmesg"	- saved console log
+		"mce"	- architecture dependent data from fatal h/w error
+
+		The "erase" file is used to signal that a file has been
+		read and that the underlying platform driver can reclaim
+		the space in the persistent store. Just write the name of
+		the file to be removed to the "erase" file:
+
+		$ echo dmesg-1 > /sys/firmware/pstore/erase
+
+		The expectation is that all files in /sys/firmware/pstore
+		will be saved elsewhere and erased from persistent store
+		soon after boot to free up space ready for the next
+		catastrophe.
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