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[S390] s390: hibernation support for s390

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This patch introduces the hibernation backend support to the
s390 architecture. Now it is possible to suspend a mainframe Linux
guest using the following command:

echo disk > /sys/power/state

Signed-off-by: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hans-Joachim Picht
2009-06-16 10:30:52 +02:00
committed by Martin Schwidefsky
parent c369527f18
commit 155af2f95f
12 changed files with 375 additions and 27 deletions
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38
arch/s390/kernel/smp.c
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@@ -1,7 +1,7 @@
/*
* arch/s390/kernel/smp.c
*
* Copyright IBM Corp. 1999,2007
* Copyright IBM Corp. 1999, 2009
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
* Heiko Carstens (heiko.carstens@de.ibm.com)
@@ -1031,6 +1031,42 @@ out:
static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
dispatching_store);
/*
* If the resume kernel runs on another cpu than the suspended kernel,
* we have to switch the cpu IDs in the logical map.
*/
void smp_switch_boot_cpu_in_resume(u32 resume_phys_cpu_id,
struct _lowcore *suspend_lowcore)
{
int cpu, suspend_cpu_id, resume_cpu_id;
u32 suspend_phys_cpu_id;
suspend_phys_cpu_id = __cpu_logical_map[suspend_lowcore->cpu_nr];
suspend_cpu_id = suspend_lowcore->cpu_nr;
for_each_present_cpu(cpu) {
if (__cpu_logical_map[cpu] == resume_phys_cpu_id) {
resume_cpu_id = cpu;
goto found;
}
}
panic("Could not find resume cpu in logical map.\n");
found:
printk("Resume cpu ID: %i/%i\n", resume_phys_cpu_id, resume_cpu_id);
printk("Suspend cpu ID: %i/%i\n", suspend_phys_cpu_id, suspend_cpu_id);
__cpu_logical_map[resume_cpu_id] = suspend_phys_cpu_id;
__cpu_logical_map[suspend_cpu_id] = resume_phys_cpu_id;
lowcore_ptr[suspend_cpu_id]->cpu_addr = resume_phys_cpu_id;
}
u32 smp_get_phys_cpu_id(void)
{
return __cpu_logical_map[smp_processor_id()];
}
static int __init topology_init(void)
{
int cpu;