[ARM SMP] Add core ARM support for local timers

Add infrastructure for supporting per-cpu local timers to update
the profiling information and update system time accounting.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 34 insertions, 0 deletions

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index f5fc57e0fe41..77e2e9ca89fa 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -185,6 +185,11 @@ int __cpuexit __cpu_disable(void)
         migrate_irqs();
 
         /*
+         * Stop the local timer for this CPU.
+         */
+        local_timer_stop(cpu);
+
+        /*
          * Flush user cache and TLB mappings, and then remove this CPU
          * from the vm mask set of all processes.
          */
@@ -290,6 +295,11 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
         cpu_set(cpu, cpu_online_map);
 
         /*
+         * Setup local timer for this CPU.
+         */
+        local_timer_setup(cpu);
+
+        /*
          * OK, it's off to the idle thread for us
          */
         cpu_idle();
@@ -454,6 +464,18 @@ void show_ipi_list(struct seq_file *p)
         seq_putc(p, '\n');
 }
 
+void show_local_irqs(struct seq_file *p)
+{
+        unsigned int cpu;
+
+        seq_printf(p, "LOC: ");
+
+        for_each_present_cpu(cpu)
+                seq_printf(p, "%10u ", irq_stat[cpu].local_timer_irqs);
+
+        seq_putc(p, '\n');
+}
+
 static void ipi_timer(struct pt_regs *regs)
 {
         int user = user_mode(regs);
@@ -464,6 +486,18 @@ static void ipi_timer(struct pt_regs *regs)
         irq_exit();
 }
 
+#ifdef CONFIG_LOCAL_TIMERS
+asmlinkage void do_local_timer(struct pt_regs *regs)
+{
+        int cpu = smp_processor_id();
+
+        if (local_timer_ack()) {
+                irq_stat[cpu].local_timer_irqs++;
+                ipi_timer(regs);
+        }
+}
+#endif
+
 /*
  * ipi_call_function - handle IPI from smp_call_function()
  *