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authorPer Fransson <per.xx.fransson@stericsson.com>2010-12-03 10:53:38 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-12-04 11:02:04 +0000
commitb23065313297e750edd57ab6edfd36224826724e (patch)
tree93b2935d8d94bc702e35e2b99047a7d0dc931e8b /arch/arm/kernel/machine_kexec.c
parentcd849ae9cd291117c0f7e0e8d531ab62a906e308 (diff)
ARM: 6522/1: kexec: Add call to non-crashing cores through IPI
When kexec is used to start a crash kernel the other cores are notified. These non-crashing cores will save their state in the crash notes and then do nothing. Signed-off-by: Per Fransson <per.xx.fransson@stericsson.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/machine_kexec.c')
-rw-r--r--arch/arm/kernel/machine_kexec.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index 3a8fd5140d7a..30ead135ff5f 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -23,6 +23,8 @@ extern unsigned long kexec_indirection_page;
extern unsigned long kexec_mach_type;
extern unsigned long kexec_boot_atags;
+static atomic_t waiting_for_crash_ipi;
+
/*
* Provide a dummy crash_notes definition while crash dump arrives to arm.
* This prevents breakage of crash_notes attribute in kernel/ksysfs.c.
@@ -37,9 +39,37 @@ void machine_kexec_cleanup(struct kimage *image)
{
}
+void machine_crash_nonpanic_core(void *unused)
+{
+ struct pt_regs regs;
+
+ crash_setup_regs(&regs, NULL);
+ printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n",
+ smp_processor_id());
+ crash_save_cpu(&regs, smp_processor_id());
+ flush_cache_all();
+
+ atomic_dec(&waiting_for_crash_ipi);
+ while (1)
+ cpu_relax();
+}
+
void machine_crash_shutdown(struct pt_regs *regs)
{
+ unsigned long msecs;
+
local_irq_disable();
+
+ atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
+ smp_call_function(machine_crash_nonpanic_core, NULL, false);
+ msecs = 1000; /* Wait at most a second for the other cpus to stop */
+ while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
+ mdelay(1);
+ msecs--;
+ }
+ if (atomic_read(&waiting_for_crash_ipi) > 0)
+ printk(KERN_WARNING "Non-crashing CPUs did not react to IPI\n");
+
crash_save_cpu(regs, smp_processor_id());
printk(KERN_INFO "Loading crashdump kernel...\n");