[PATCH] ppc64: Move iSeries_idle() into iSeries_setup.c
Move iSeries_idle() into iSeries_setup.c, no one else needs to know about it.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/ppc64/kernel/iSeries_setup.c b/arch/ppc64/kernel/iSeries_setup.c
index b3f770f..1139e27 100644
--- a/arch/ppc64/kernel/iSeries_setup.c
+++ b/arch/ppc64/kernel/iSeries_setup.c
@@ -834,6 +834,87 @@
late_initcall(iSeries_src_init);
+static unsigned long maxYieldTime = 0;
+static unsigned long minYieldTime = 0xffffffffffffffffUL;
+
+static inline void process_iSeries_events(void)
+{
+ asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
+}
+
+static void yield_shared_processor(void)
+{
+ unsigned long tb;
+ unsigned long yieldTime;
+
+ HvCall_setEnabledInterrupts(HvCall_MaskIPI |
+ HvCall_MaskLpEvent |
+ HvCall_MaskLpProd |
+ HvCall_MaskTimeout);
+
+ tb = get_tb();
+ /* Compute future tb value when yield should expire */
+ HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
+
+ yieldTime = get_tb() - tb;
+ if (yieldTime > maxYieldTime)
+ maxYieldTime = yieldTime;
+
+ if (yieldTime < minYieldTime)
+ minYieldTime = yieldTime;
+
+ /*
+ * The decrementer stops during the yield. Force a fake decrementer
+ * here and let the timer_interrupt code sort out the actual time.
+ */
+ get_paca()->lppaca.int_dword.fields.decr_int = 1;
+ process_iSeries_events();
+}
+
+static int iSeries_idle(void)
+{
+ struct paca_struct *lpaca;
+ long oldval;
+
+ /* ensure iSeries run light will be out when idle */
+ ppc64_runlatch_off();
+
+ lpaca = get_paca();
+
+ while (1) {
+ if (lpaca->lppaca.shared_proc) {
+ if (hvlpevent_is_pending())
+ process_iSeries_events();
+ if (!need_resched())
+ yield_shared_processor();
+ } else {
+ oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
+
+ if (!oldval) {
+ set_thread_flag(TIF_POLLING_NRFLAG);
+
+ while (!need_resched()) {
+ HMT_medium();
+ if (hvlpevent_is_pending())
+ process_iSeries_events();
+ HMT_low();
+ }
+
+ HMT_medium();
+ clear_thread_flag(TIF_POLLING_NRFLAG);
+ } else {
+ set_need_resched();
+ }
+ }
+
+ ppc64_runlatch_on();
+ schedule();
+ ppc64_runlatch_off();
+ }
+
+ return 0;
+}
+
#ifndef CONFIG_PCI
void __init iSeries_init_IRQ(void) { }
#endif