mirror of https://gitee.com/openkylin/linux.git
[PATCH] ppc64: Move pSeries idle functions into pSeries_setup.c
dedicated_idle() and shared_idle() are only used by pSeries, so move them into pSeries_setup.c 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>
This commit is contained in:
Michael Ellerman
Linus Torvalds
parent
d200903e11
commit
c66d5dd6b5
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@ -74,137 +74,6 @@ int default_idle(void)
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return 0;
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}
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#ifdef CONFIG_PPC_PSERIES
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DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
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int dedicated_idle(void)
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{
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long oldval;
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struct paca_struct *lpaca = get_paca(), *ppaca;
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unsigned long start_snooze;
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unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
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unsigned int cpu = smp_processor_id();
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ppaca = &paca[cpu ^ 1];
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while (1) {
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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lpaca->lppaca.idle = 1;
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oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
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if (!oldval) {
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set_thread_flag(TIF_POLLING_NRFLAG);
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start_snooze = __get_tb() +
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*smt_snooze_delay * tb_ticks_per_usec;
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while (!need_resched() && !cpu_is_offline(cpu)) {
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/*
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* Go into low thread priority and possibly
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* low power mode.
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*/
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HMT_low();
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HMT_very_low();
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if (*smt_snooze_delay == 0 ||
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__get_tb() < start_snooze)
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continue;
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HMT_medium();
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if (!(ppaca->lppaca.idle)) {
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local_irq_disable();
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/*
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* We are about to sleep the thread
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* and so wont be polling any
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* more.
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*/
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clear_thread_flag(TIF_POLLING_NRFLAG);
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/*
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* SMT dynamic mode. Cede will result
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* in this thread going dormant, if the
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* partner thread is still doing work.
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* Thread wakes up if partner goes idle,
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* an interrupt is presented, or a prod
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* occurs. Returning from the cede
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* enables external interrupts.
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*/
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if (!need_resched())
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cede_processor();
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else
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local_irq_enable();
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} else {
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/*
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* Give the HV an opportunity at the
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* processor, since we are not doing
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* any work.
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*/
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poll_pending();
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}
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}
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clear_thread_flag(TIF_POLLING_NRFLAG);
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} else {
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set_need_resched();
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}
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HMT_medium();
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lpaca->lppaca.idle = 0;
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schedule();
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if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
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cpu_die();
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}
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return 0;
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}
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static int shared_idle(void)
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{
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struct paca_struct *lpaca = get_paca();
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unsigned int cpu = smp_processor_id();
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while (1) {
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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lpaca->lppaca.idle = 1;
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while (!need_resched() && !cpu_is_offline(cpu)) {
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local_irq_disable();
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/*
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* Yield the processor to the hypervisor. We return if
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* an external interrupt occurs (which are driven prior
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* to returning here) or if a prod occurs from another
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* processor. When returning here, external interrupts
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* are enabled.
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*
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* Check need_resched() again with interrupts disabled
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* to avoid a race.
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*/
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if (!need_resched())
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cede_processor();
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else
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local_irq_enable();
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}
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HMT_medium();
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lpaca->lppaca.idle = 0;
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schedule();
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if (cpu_is_offline(smp_processor_id()) &&
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system_state == SYSTEM_RUNNING)
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cpu_die();
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}
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return 0;
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}
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#endif /* CONFIG_PPC_PSERIES */
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int native_idle(void)
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{
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while(1) {
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@ -418,6 +418,133 @@ static int __init pSeries_probe(int platform)
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return 1;
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}
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DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
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int dedicated_idle(void)
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{
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long oldval;
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struct paca_struct *lpaca = get_paca(), *ppaca;
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unsigned long start_snooze;
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unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
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unsigned int cpu = smp_processor_id();
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ppaca = &paca[cpu ^ 1];
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while (1) {
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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lpaca->lppaca.idle = 1;
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oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
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if (!oldval) {
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set_thread_flag(TIF_POLLING_NRFLAG);
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start_snooze = __get_tb() +
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*smt_snooze_delay * tb_ticks_per_usec;
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while (!need_resched() && !cpu_is_offline(cpu)) {
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/*
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* Go into low thread priority and possibly
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* low power mode.
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*/
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HMT_low();
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HMT_very_low();
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if (*smt_snooze_delay == 0 ||
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__get_tb() < start_snooze)
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continue;
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HMT_medium();
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if (!(ppaca->lppaca.idle)) {
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local_irq_disable();
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/*
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* We are about to sleep the thread
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* and so wont be polling any
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* more.
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*/
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clear_thread_flag(TIF_POLLING_NRFLAG);
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/*
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* SMT dynamic mode. Cede will result
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* in this thread going dormant, if the
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* partner thread is still doing work.
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* Thread wakes up if partner goes idle,
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* an interrupt is presented, or a prod
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* occurs. Returning from the cede
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* enables external interrupts.
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*/
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if (!need_resched())
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cede_processor();
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else
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local_irq_enable();
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} else {
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/*
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* Give the HV an opportunity at the
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* processor, since we are not doing
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* any work.
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*/
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poll_pending();
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}
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}
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clear_thread_flag(TIF_POLLING_NRFLAG);
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} else {
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set_need_resched();
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}
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HMT_medium();
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lpaca->lppaca.idle = 0;
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schedule();
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if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
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cpu_die();
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}
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return 0;
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}
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static int shared_idle(void)
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{
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struct paca_struct *lpaca = get_paca();
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unsigned int cpu = smp_processor_id();
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while (1) {
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/*
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* Indicate to the HV that we are idle. Now would be
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* a good time to find other work to dispatch.
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*/
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lpaca->lppaca.idle = 1;
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while (!need_resched() && !cpu_is_offline(cpu)) {
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local_irq_disable();
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/*
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* Yield the processor to the hypervisor. We return if
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* an external interrupt occurs (which are driven prior
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* to returning here) or if a prod occurs from another
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* processor. When returning here, external interrupts
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* are enabled.
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*
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* Check need_resched() again with interrupts disabled
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* to avoid a race.
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*/
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if (!need_resched())
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cede_processor();
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else
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local_irq_enable();
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}
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HMT_medium();
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lpaca->lppaca.idle = 0;
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schedule();
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if (cpu_is_offline(smp_processor_id()) &&
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system_state == SYSTEM_RUNNING)
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cpu_die();
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}
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return 0;
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}
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struct machdep_calls __initdata pSeries_md = {
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.probe = pSeries_probe,
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.setup_arch = pSeries_setup_arch,
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