* Intel SMP support routines.
*
* (c) 1995 Alan Cox, Building #3 <alan@lxorguk.ukuu.org.uk>
- * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>
+ * (c) 1998-99, 2000, 2009 Ingo Molnar <mingo@redhat.com>
* (c) 2002,2003 Andi Kleen, SuSE Labs.
*
* i386 and x86_64 integration by Glauber Costa <gcosta@redhat.com>
#include <linux/cache.h>
#include <linux/interrupt.h>
#include <linux/cpu.h>
+#include <linux/gfp.h>
#include <asm/mtrr.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>
#include <asm/proto.h>
-#include <mach_ipi.h>
-#include <asm/genapic.h>
+#include <asm/apic.h>
/*
* Some notes on x86 processor bugs affecting SMP operation:
*
* this function calls the 'stop' function on all other CPUs in the system.
*/
+asmlinkage void smp_reboot_interrupt(void)
+{
+ ack_APIC_irq();
+ irq_enter();
+ stop_this_cpu(NULL);
+ irq_exit();
+}
+
static void native_smp_send_stop(void)
{
unsigned long flags;
+ unsigned long wait;
if (reboot_force)
return;
- smp_call_function(stop_this_cpu, NULL, 0);
+ /*
+ * Use an own vector here because smp_call_function
+ * does lots of things not suitable in a panic situation.
+ * On most systems we could also use an NMI here,
+ * but there are a few systems around where NMI
+ * is problematic so stay with an non NMI for now
+ * (this implies we cannot stop CPUs spinning with irq off
+ * currently)
+ */
+ if (num_online_cpus() > 1) {
+ apic->send_IPI_allbutself(REBOOT_VECTOR);
+
+ /* Don't wait longer than a second */
+ wait = USEC_PER_SEC;
+ while (num_online_cpus() > 1 && wait--)
+ udelay(1);
+ }
+
local_irq_save(flags);
disable_local_APIC();
local_irq_restore(flags);
{
ack_APIC_irq();
inc_irq_stat(irq_resched_count);
+ /*
+ * KVM uses this interrupt to force a cpu out of guest mode
+ */
}
void smp_call_function_interrupt(struct pt_regs *regs)
}
struct smp_ops smp_ops = {
- .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
- .smp_prepare_cpus = native_smp_prepare_cpus,
- .smp_cpus_done = native_smp_cpus_done,
+ .smp_prepare_boot_cpu = native_smp_prepare_boot_cpu,
+ .smp_prepare_cpus = native_smp_prepare_cpus,
+ .smp_cpus_done = native_smp_cpus_done,
- .smp_send_stop = native_smp_send_stop,
- .smp_send_reschedule = native_smp_send_reschedule,
+ .smp_send_stop = native_smp_send_stop,
+ .smp_send_reschedule = native_smp_send_reschedule,
- .cpu_up = native_cpu_up,
- .cpu_die = native_cpu_die,
- .cpu_disable = native_cpu_disable,
- .play_dead = native_play_dead,
+ .cpu_up = native_cpu_up,
+ .cpu_die = native_cpu_die,
+ .cpu_disable = native_cpu_disable,
+ .play_dead = native_play_dead,
- .send_call_func_ipi = native_send_call_func_ipi,
+ .send_call_func_ipi = native_send_call_func_ipi,
.send_call_func_single_ipi = native_send_call_func_single_ipi,
};
EXPORT_SYMBOL_GPL(smp_ops);