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Commit b2306531 authored by Per Fransson's avatar Per Fransson Committed by Russell King
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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: default avatarPer Fransson <per.xx.fransson@stericsson.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent cd849ae9

arch/arm/kernel/machine_kexec.c

+30 −0
Original line number Diff line number Diff line
@@ -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");