1 files changed, 71 insertions, 0 deletions

diff --git a/arch/mips/kernel/crash.c b/arch/mips/kernel/crash.c
new file mode 100644
index 000000000000..0f53c39324bb
--- /dev/null
+++ b/arch/mips/kernel/crash.c
@@ -0,0 +1,71 @@
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/reboot.h>
+#include <linux/kexec.h>
+#include <linux/bootmem.h>
+#include <linux/crash_dump.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+
+/* This keeps a track of which one is crashing cpu. */
+static int crashing_cpu = -1;
+static cpumask_t cpus_in_crash = CPU_MASK_NONE;
+
+#ifdef CONFIG_SMP
+static void crash_shutdown_secondary(void *ignore)
+{
+        struct pt_regs *regs;
+        int cpu = smp_processor_id();
+
+        regs = task_pt_regs(current);
+
+        if (!cpu_online(cpu))
+                return;
+
+        local_irq_disable();
+        if (!cpu_isset(cpu, cpus_in_crash))
+                crash_save_cpu(regs, cpu);
+        cpu_set(cpu, cpus_in_crash);
+
+        while (!atomic_read(&kexec_ready_to_reboot))
+                cpu_relax();
+        relocated_kexec_smp_wait(NULL);
+        /* NOTREACHED */
+}
+
+static void crash_kexec_prepare_cpus(void)
+{
+        unsigned int msecs;
+
+        unsigned int ncpus = num_online_cpus() - 1;/* Excluding the panic cpu */
+
+        dump_send_ipi(crash_shutdown_secondary);
+        smp_wmb();
+
+        /*
+         * The crash CPU sends an IPI and wait for other CPUs to
+         * respond. Delay of at least 10 seconds.
+         */
+        pr_emerg("Sending IPI to other cpus...\n");
+        msecs = 10000;
+        while ((cpus_weight(cpus_in_crash) < ncpus) && (--msecs > 0)) {
+                cpu_relax();
+                mdelay(1);
+        }
+}
+
+#else /* !defined(CONFIG_SMP)  */
+static void crash_kexec_prepare_cpus(void) {}
+#endif /* !defined(CONFIG_SMP)  */
+
+void default_machine_crash_shutdown(struct pt_regs *regs)
+{
+        local_irq_disable();
+        crashing_cpu = smp_processor_id();
+        crash_save_cpu(regs, crashing_cpu);
+        crash_kexec_prepare_cpus();
+        cpu_set(crashing_cpu, cpus_in_crash);
+}