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linux-imx/Documentation/ABI/testing/pstore
Mauro Carvalho Chehab 9fc3678e47 ABI: pstore: Fix What field 
If both /sys/fs/pstore/... and /dev/pstore/... are possible,
it should use, instead, two What: fields.

Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/e19daafb779bd3a8f9ae1c15f670752355e5d40f.1631782432.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-09-21 18:31:16 +02:00

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What: /sys/fs/pstore/... What: /dev/pstore/... Date: March 2011 KernelVersion: 2.6.39 Contact: tony.luck@intel.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::

	    # mount -t pstore -o kmsg_bytes=8000 - /sys/fs/pstore

	    $ ls -l /sys/fs/pstore/
	    total 0
	    -r--r--r-- 1 root root 7896 Nov 30 15:38 dmesg-erst-1

	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

	Once the information in a file has been read, removing
	the file will signal to the underlying persistent storage
	device that it can reclaim the space for later re-use::

	    $ rm /sys/fs/pstore/dmesg-erst-1

	The expectation is that all files in /sys/fs/pstore/
	will be saved elsewhere and erased from persistent store
	soon after boot to free up space ready for the next
	catastrophe.

	The 'kmsg_bytes' mount option changes the target amount of
	data saved on each oops/panic. Pstore saves (possibly
	multiple) files based on the record size of the underlying
	persistent storage until at least this amount is reached.
	Default is 10 Kbytes.

	Pstore only supports one backend at a time. If multiple
	backends are available, the preferred backend may be
	set by passing the pstore.backend= argument to the kernel at
	boot time.