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[S390] Add PSW restart shutdown trigger

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With this patch a new S390 shutdown trigger "restart" is added. If under
z/VM "systerm restart" is entered or under the HMC the "PSW restart" button
is pressed, the PSW located at 0 (31 bit) or 0x1a0 (64 bit) bit is loaded.
Now we execute do_restart() that processes the restart action that is
defined under /sys/firmware/shutdown_actions/on_restart. Currently the
following actions are possible: reipl (default), stop, vmcmd, dump, and
dump_reipl.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Michael Holzheu
2011-08-03 16:44:19 +02:00
committed by Heiko Carstens
parent 944291de33
commit 7dd6b3343f
9 changed files with 146 additions and 5 deletions
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11
arch/s390/kernel/smp.c
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@@ -468,6 +468,11 @@ int __cpuinit start_secondary(void *cpuvoid)
ipi_call_lock();
set_cpu_online(smp_processor_id(), true);
ipi_call_unlock();
__ctl_clear_bit(0, 28); /* Disable lowcore protection */
S390_lowcore.restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
S390_lowcore.restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler;
__ctl_set_bit(0, 28); /* Enable lowcore protection */
/* Switch on interrupts */
local_irq_enable();
/* cpu_idle will call schedule for us */
@@ -507,7 +512,11 @@ static int __cpuinit smp_alloc_lowcore(int cpu)
memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512);
lowcore->async_stack = async_stack + ASYNC_SIZE;
lowcore->panic_stack = panic_stack + PAGE_SIZE;
lowcore->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
lowcore->restart_psw.addr =
PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
if (user_mode != HOME_SPACE_MODE)
lowcore->restart_psw.mask |= PSW_ASC_HOME;
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
unsigned long save_area;