aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/kernel/smp.c
diff options
context:
space:
mode:
authorHans-Joachim Picht <hans@linux.vnet.ibm.com>2009-06-16 10:30:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-16 10:31:22 +0200
commit155af2f95f905c830688dd0ca7c7cac4107334fd (patch)
tree4304a39e713d1594903e838830c4029715cc7a2a /arch/s390/kernel/smp.c
parentc369527f18f8560bd3580be2676cb55b54b02ee6 (diff)
downloadlinux-linaro-stable-155af2f95f905c830688dd0ca7c7cac4107334fd.tar.gz
[S390] s390: hibernation support for s390
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>
Diffstat (limited to 'arch/s390/kernel/smp.c')
-rw-r--r--arch/s390/kernel/smp.c38
1 files changed, 37 insertions, 1 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index cc8c484984e3..fd8e3111a4e8 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -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;