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powerpc/fadump: update documentation about crashkernel parameter reuse

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As we are reusing crashkernel parameter instead of fadump_reserve_mem
parameter to specify the memory to reserve for fadump's crash kernel,
update the documentation accordingly.

Link: http://lkml.kernel.org/r/149035347559.6881.14224829694291758581.stgit@hbathini.in.ibm.com
Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hari Bathini 2017-05-08 15:56:31 -07:00 committed by Linus Torvalds
parent 11550dc0a0
commit 92019efc6c
1 changed files with 15 additions and 8 deletions
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23
Documentation/powerpc/firmware-assisted-dump.txt
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@ -55,10 +55,14 @@ as follows:
booted with restricted memory. By default, the boot memory booted with restricted memory. By default, the boot memory
size will be the larger of 5% of system RAM or 256MB. size will be the larger of 5% of system RAM or 256MB.
Alternatively, user can also specify boot memory size Alternatively, user can also specify boot memory size
through boot parameter 'fadump_reserve_mem=' which will through boot parameter 'crashkernel=' which will override
override the default calculated size. Use this option the default calculated size. Use this option if default
if default boot memory size is not sufficient for second boot memory size is not sufficient for second kernel to
kernel to boot successfully. boot successfully. For syntax of crashkernel= parameter,
refer to Documentation/kdump/kdump.txt. If any offset is
provided in crashkernel= parameter, it will be ignored
as fadump reserves memory at end of RAM for boot memory
dump preservation in case of a crash.
-- After the low memory (boot memory) area has been saved, the -- After the low memory (boot memory) area has been saved, the
firmware will reset PCI and other hardware state. It will firmware will reset PCI and other hardware state. It will
@ -158,13 +162,16 @@ How to enable firmware-assisted dump (fadump):
1. Set config option CONFIG_FA_DUMP=y and build kernel. 1. Set config option CONFIG_FA_DUMP=y and build kernel.
2. Boot into linux kernel with 'fadump=on' kernel cmdline option. 2. Boot into linux kernel with 'fadump=on' kernel cmdline option.
3. Optionally, user can also set 'fadump_reserve_mem=' kernel cmdline 3. Optionally, user can also set 'crashkernel=' kernel cmdline
to specify size of the memory to reserve for boot memory dump to specify size of the memory to reserve for boot memory dump
preservation. preservation.
NOTE: If firmware-assisted dump fails to reserve memory then it will NOTE: 1. 'fadump_reserve_mem=' parameter has been deprecated. Instead
fallback to existing kdump mechanism if 'crashkernel=' option use 'crashkernel=' to specify size of the memory to reserve
is set at kernel cmdline. for boot memory dump preservation.
2. If firmware-assisted dump fails to reserve memory then it
will fallback to existing kdump mechanism if 'crashkernel='
option is set at kernel cmdline.
Sysfs/debugfs files: Sysfs/debugfs files:
------------ ------------