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| author |   Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2020-02-20 16:22:30 +0100 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2020-03-23 13:41:54 +0100 |
| commit | 1a2ae03b1938b050c3bbd79e79d5075e0307fe20 (patch) | |
| tree | 52a9ffb9acd1ac06c370aa0cff04ef33da9f57b8 /arch/s390/include/asm/ipl.h | |
| parent | s390/zcrypt: replace snprintf/sprintf with scnprintf (diff) | |
| download | wireguard-linux-1a2ae03b1938b050c3bbd79e79d5075e0307fe20.tar.xz wireguard-linux-1a2ae03b1938b050c3bbd79e79d5075e0307fe20.zip | |
s390/ipl: add support to control memory clearing for FCP and CCW re-IPL
Re-IPL for both CCW and FCP is currently done by using diag 308 with the
"Load Clear" subcode, which means that all memory will be cleared.
This can increase re-IPL duration considerably on very large machines.
For CCW devices, there is also a "Load Normal" subcode that was only used
for dump kernels so far. For FCP devices, a similar "Load Normal" subcode
was introduced with z14. The "Load Normal" diag 308 subcode allows to
re-IPL without clearing memory.
This patch adds a new "clear" sysfs attribute to /sys/firmware/reipl for
both the ccw and fcp subdirectories, which can be set to either "0" or "1"
to disable or enable re-IPL with memory clearing. The default value is "0",
which disables memory clearing.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/ipl.h')
| -rw-r--r-- | arch/s390/include/asm/ipl.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/ipl.h b/arch/s390/include/asm/ipl.h index 084e71b7272a..b63bd66404b8 100644 --- a/arch/s390/include/asm/ipl.h +++ b/arch/s390/include/asm/ipl.h @@ -119,6 +119,7 @@ enum diag308_subcode { DIAG308_LOAD_NORMAL_DUMP = 4, DIAG308_SET = 5, DIAG308_STORE = 6, + DIAG308_LOAD_NORMAL = 7, }; enum diag308_rc { |