diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/ppc64/kernel/iSeries_setup.c | 84 |
1 files changed, 47 insertions, 37 deletions
diff --git a/arch/ppc64/kernel/iSeries_setup.c b/arch/ppc64/kernel/iSeries_setup.c index fae215ea54b..b4c919e18fa 100644 --- a/arch/ppc64/kernel/iSeries_setup.c +++ b/arch/ppc64/kernel/iSeries_setup.c @@ -834,9 +834,6 @@ static int __init iSeries_src_init(void) 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"); @@ -845,7 +842,6 @@ static inline void process_iSeries_events(void) static void yield_shared_processor(void) { unsigned long tb; - unsigned long yieldTime; HvCall_setEnabledInterrupts(HvCall_MaskIPI | HvCall_MaskLpEvent | @@ -856,13 +852,6 @@ static void yield_shared_processor(void) /* 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. @@ -871,45 +860,62 @@ static void yield_shared_processor(void) process_iSeries_events(); } -static int iSeries_idle(void) +static int iseries_shared_idle(void) { - struct paca_struct *lpaca; - long oldval; + while (1) { + while (!need_resched() && !hvlpevent_is_pending()) { + local_irq_disable(); + ppc64_runlatch_off(); + + /* Recheck with irqs off */ + if (!need_resched() && !hvlpevent_is_pending()) + yield_shared_processor(); - /* ensure iSeries run light will be out when idle */ - ppc64_runlatch_off(); + HMT_medium(); + local_irq_enable(); + } + + ppc64_runlatch_on(); - lpaca = get_paca(); + if (hvlpevent_is_pending()) + process_iSeries_events(); + + schedule(); + } + + return 0; +} + +static int iseries_dedicated_idle(void) +{ + struct paca_struct *lpaca = get_paca(); + long oldval; 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); + oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED); - if (!oldval) { - set_thread_flag(TIF_POLLING_NRFLAG); + if (!oldval) { + set_thread_flag(TIF_POLLING_NRFLAG); - while (!need_resched()) { + while (!need_resched()) { + ppc64_runlatch_off(); + HMT_low(); + + if (hvlpevent_is_pending()) { HMT_medium(); - if (hvlpevent_is_pending()) - process_iSeries_events(); - HMT_low(); + ppc64_runlatch_on(); + process_iSeries_events(); } - - HMT_medium(); - clear_thread_flag(TIF_POLLING_NRFLAG); - } else { - set_need_resched(); } + + HMT_medium(); + clear_thread_flag(TIF_POLLING_NRFLAG); + } else { + set_need_resched(); } ppc64_runlatch_on(); schedule(); - ppc64_runlatch_off(); } return 0; @@ -940,6 +946,10 @@ void __init iSeries_early_setup(void) ppc_md.get_rtc_time = iSeries_get_rtc_time; ppc_md.calibrate_decr = iSeries_calibrate_decr; ppc_md.progress = iSeries_progress; - ppc_md.idle_loop = iSeries_idle; + + if (get_paca()->lppaca.shared_proc) + ppc_md.idle_loop = iseries_shared_idle; + else + ppc_md.idle_loop = iseries_dedicated_idle; } |