[PATCH] ACPI keep track of timer broadcasting

This is a preperatory patch for highres/dyntick:

- replace the big #ifdef ARCH_APICTIMER_STOPS_ON_C3 hackery by functions

- remove the double switch in the power verify function (in the worst case
  we switched ipi to apic and 20usec later apic to ipi)

- keep track of the the state which stops local APIC timer

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Len Brown <len.brown@intel.com>
Cc: <linux-acpi@vger.kernel.org>
Cc: Andi Kleen <ak@suse.de>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 48 insertions, 19 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index e34af7772a66..4ea6d8b20d17 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -248,6 +248,48 @@ static void acpi_cstate_enter(struct acpi_processor_cx *cstate)
         }
 }
 
+#ifdef ARCH_APICTIMER_STOPS_ON_C3
+
+/*
+ * Some BIOS implementations switch to C3 in the published C2 state.
+ * This seems to be a common problem on AMD boxen, but other vendors
+ * are affected too. We pick the most conservative approach: we assume
+ * that the local APIC stops in both C2 and C3.
+ */
+static void acpi_timer_check_state(int state, struct acpi_processor *pr,
+                                   struct acpi_processor_cx *cx)
+{
+        struct acpi_processor_power *pwr = &pr->power;
+
+        /*
+         * Check, if one of the previous states already marked the lapic
+         * unstable
+         */
+        if (pwr->timer_broadcast_on_state < state)
+                return;
+
+        if (cx->type >= ACPI_STATE_C2)
+                pr->power.timer_broadcast_on_state = state;
+}
+
+static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
+{
+        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);
+}
+
+#else
+
+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) { }
+
+#endif
+
 static void acpi_processor_idle(void)
 {
         struct acpi_processor *pr = NULL;
@@ -914,11 +956,7 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
         unsigned int i;
         unsigned int working = 0;
 
-#ifdef ARCH_APICTIMER_STOPS_ON_C3
-        int timer_broadcast = 0;
-        cpumask_t mask = cpumask_of_cpu(pr->id);
-        on_each_cpu(switch_ipi_to_APIC_timer, &mask, 1, 1);
-#endif
+        pr->power.timer_broadcast_on_state = INT_MAX;
 
         for (i = 1; i < ACPI_PROCESSOR_MAX_POWER; i++) {
                 struct acpi_processor_cx *cx = &pr->power.states[i];
@@ -930,21 +968,14 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
 
                 case ACPI_STATE_C2:
                         acpi_processor_power_verify_c2(cx);
-#ifdef ARCH_APICTIMER_STOPS_ON_C3
-                        /* Some AMD systems fake C3 as C2, but still
-                           have timer troubles */
-                        if (cx->valid && 
-                                boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
-                                timer_broadcast++;
-#endif
+                        if (cx->valid)
+                                acpi_timer_check_state(i, pr, cx);
                         break;
 
                 case ACPI_STATE_C3:
                         acpi_processor_power_verify_c3(pr, cx);
-#ifdef ARCH_APICTIMER_STOPS_ON_C3
                         if (cx->valid)
-                                timer_broadcast++;
-#endif
+                                acpi_timer_check_state(i, pr, cx);
                         break;
                 }
 
@@ -952,10 +983,7 @@ static int acpi_processor_power_verify(struct acpi_processor *pr)
                         working++;
         }
 
-#ifdef ARCH_APICTIMER_STOPS_ON_C3
-        if (timer_broadcast)
-                on_each_cpu(switch_APIC_timer_to_ipi, &mask, 1, 1);
-#endif
+        acpi_propagate_timer_broadcast(pr);
 
         return (working);
 }
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 7798d2a9f793..916c0102db5b 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -79,6 +79,7 @@ struct acpi_processor_power {
         u32 bm_activity;
         int count;
         struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
+        int timer_broadcast_on_state;
 };
 
 /* Performance Management */