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ARM: 6522/1: kexec: Add call to non-crashing cores through IPI

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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>
This commit is contained in:
Per Fransson 2010-12-03 10:53:38 +01:00 committed by Russell King
parent cd849ae9cd
commit b230653132
1 changed files with 30 additions and 0 deletions
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30
arch/arm/kernel/machine_kexec.c
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@ -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");