From b23065313297e750edd57ab6edfd36224826724e Mon Sep 17 00:00:00 2001 From: Per Fransson Date: Fri, 3 Dec 2010 10:53:38 +0100 Subject: 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 Signed-off-by: Russell King --- arch/arm/kernel/machine_kexec.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'arch/arm/kernel/machine_kexec.c') 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(®s, NULL); + printk(KERN_DEBUG "CPU %u will stop doing anything useful since another CPU has crashed\n", + smp_processor_id()); + crash_save_cpu(®s, 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"); -- cgit