[PATCH] clockevents: i386 drivers

Add clockevent drivers for i386: lapic (local) and PIT/HPET (global).  Update
the timer IRQ to call into the PIT/HPET driver's event handler and the
lapic-timer IRQ to call into the lapic clockevent driver.  The assignement of
timer functionality is delegated to the core framework code and replaces the
compile and runtime evalution in do_timer_interrupt_hook()

Use the clockevents broadcast support and implement the lapic_broadcast
function for ACPI.

No changes to existing functionality.

[ kdump fix from Vivek Goyal <vgoyal@in.ibm.com> ]
[ fixes based on review feedback from Arjan van de Ven <arjan@infradead.org> ]
Cleanups-from: Adrian Bunk <bunk@stusta.de>
Build-fixes-from: Andrew Morton <akpm@osdl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 4ea6d8b20d17..8206fc1ecc58 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -39,6 +39,7 @@
 #include <linux/moduleparam.h>
 #include <linux/sched.h>        /* need_resched() */
 #include <linux/latency.h>
+#include <linux/clockchips.h>
 
 /*
  * Include the apic definitions for x86 to have the APIC timer related defines
@@ -274,12 +275,40 @@ static void acpi_timer_check_state(int state, struct acpi_processor *pr,
 
 static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
 {
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+        unsigned long reason;
+
+        reason = pr->power.timer_broadcast_on_state < INT_MAX ?
+                CLOCK_EVT_NOTIFY_BROADCAST_ON : CLOCK_EVT_NOTIFY_BROADCAST_OFF;
+
+        clockevents_notify(reason, &pr->id);
+#else
         cpumask_t mask = cpumask_of_cpu(pr->id);
 
         if (pr->power.timer_broadcast_on_state < INT_MAX)
                 on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1);
         else
                 on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1);
+#endif
+}
+
+/* Power(C) State timer broadcast control */
+static void acpi_state_timer_broadcast(struct acpi_processor *pr,
+                                       struct acpi_processor_cx *cx,
+                                       int broadcast)
+{
+#ifdef CONFIG_GENERIC_CLOCKEVENTS
+
+        int state = cx - pr->power.states;
+
+        if (state >= pr->power.timer_broadcast_on_state) {
+                unsigned long reason;
+
+                reason = broadcast ?  CLOCK_EVT_NOTIFY_BROADCAST_ENTER :
+                        CLOCK_EVT_NOTIFY_BROADCAST_EXIT;
+                clockevents_notify(reason, &pr->id);
+        }
+#endif
 }
 
 #else
@@ -287,6 +316,11 @@ static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
 static void acpi_timer_check_state(int state, struct acpi_processor *pr,
                                    struct acpi_processor_cx *cstate) { }
 static void acpi_propagate_timer_broadcast(struct acpi_processor *pr) { }
+static void acpi_state_timer_broadcast(struct acpi_processor *pr,
+                                       struct acpi_processor_cx *cx,
+                                       int broadcast)
+{
+}
 
 #endif
 
@@ -434,6 +468,7 @@ static void acpi_processor_idle(void)
                 /* Get start time (ticks) */
                 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
                 /* Invoke C2 */
+                acpi_state_timer_broadcast(pr, cx, 1);
                 acpi_cstate_enter(cx);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
@@ -448,6 +483,7 @@ static void acpi_processor_idle(void)
                 /* Compute time (ticks) that we were actually asleep */
                 sleep_ticks =
                     ticks_elapsed(t1, t2) - cx->latency_ticks - C2_OVERHEAD;
+                acpi_state_timer_broadcast(pr, cx, 0);
                 break;
 
         case ACPI_STATE_C3:
@@ -469,6 +505,7 @@ static void acpi_processor_idle(void)
                 /* Get start time (ticks) */
                 t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
                 /* Invoke C3 */
+                acpi_state_timer_broadcast(pr, cx, 1);
                 acpi_cstate_enter(cx);
                 /* Get end time (ticks) */
                 t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
@@ -488,6 +525,7 @@ static void acpi_processor_idle(void)
                 /* Compute time (ticks) that we were actually asleep */
                 sleep_ticks =
                     ticks_elapsed(t1, t2) - cx->latency_ticks - C3_OVERHEAD;
+                acpi_state_timer_broadcast(pr, cx, 0);
                 break;
 
         default: