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.xIntDword.xFields.xDecrInt = 1;
process_iSeries_events();
}
unsigned long __init rtas_get_boot_time(void)
{
int ret[8];
int error;
unsigned int wait_time;
u64 max_wait_tb;
max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
do {
error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
wait_time = rtas_busy_delay_time(error);
if (wait_time) {
/* */
udelay(wait_time*1000);
}
} while (wait_time && (get_tb() < max_wait_tb));
if (error != 0) {
printk_ratelimited(KERN_WARNING
"error: reading the clock failed (%d)\n",
error);
return 0;
}
return mktime(ret[0], ret[1], ret[2], ret[3], ret[4], ret[5]);
}
int rtas_set_rtc_time(struct rtc_time *tm)
{
int error, wait_time;
u64 max_wait_tb;
max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
do {
error = rtas_call(rtas_token("set-time-of-day"), 7, 1, NULL,
tm->tm_year + 1900, tm->tm_mon + 1,
tm->tm_mday, tm->tm_hour, tm->tm_min,
tm->tm_sec, 0);
wait_time = rtas_busy_delay_time(error);
if (wait_time) {
if (in_interrupt())
return 1; /* */
msleep(wait_time);
}
} while (wait_time && (get_tb() < max_wait_tb));
if (error != 0)
printk_ratelimited(KERN_WARNING
"error: setting the clock failed (%d)\n",
error);
return 0;
}
static void
smp_chrp_setup_cpu(int cpu_nr)
{
static atomic_t ready = ATOMIC_INIT(1);
static volatile int frozen = 0;
if (systemcfg->platform == PLATFORM_PSERIES_LPAR) {
/* timebases already synced under the hypervisor. */
paca[cpu_nr].next_jiffy_update_tb = tb_last_stamp = get_tb();
if (cpu_nr == 0) {
systemcfg->tb_orig_stamp = tb_last_stamp;
/* Should update naca->stamp_xsec.
* For now we leave it which means the time can be some
* number of msecs off until someone does a settimeofday()
*/
}
smp_tb_synchronized = 1;
} else {
if (cpu_nr == 0) {
/* wait for all the others */
while (atomic_read(&ready) < smp_num_cpus)
barrier();
atomic_set(&ready, 1);
/* freeze the timebase */
rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
mb();
frozen = 1;
set_tb(0, 0);
paca[0].next_jiffy_update_tb = 0;
smp_space_timers(smp_num_cpus);
while (atomic_read(&ready) < smp_num_cpus)
barrier();
/* thaw the timebase again */
rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
mb();
frozen = 0;
tb_last_stamp = get_tb();
systemcfg->tb_orig_stamp = tb_last_stamp;
smp_tb_synchronized = 1;
} else {
atomic_inc(&ready);
while (!frozen)
barrier();
set_tb(0, 0);
mb();
atomic_inc(&ready);
while (frozen)
barrier();
}
}
if (OpenPIC_Addr) {
do_openpic_setup_cpu();
} else {
if (cpu_nr > 0)
xics_setup_cpu();
}
}
/* Copy data touched by real-mode code from shadow vcpu back to vcpu */
void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
struct kvmppc_book3s_shadow_vcpu *svcpu)
{
/*
* vcpu_put would just call us again because in_use hasn't
* been updated yet.
*/
preempt_disable();
/*
* Maybe we were already preempted and synced the svcpu from
* our preempt notifiers. Don't bother touching this svcpu then.
*/
if (!svcpu->in_use)
goto out;
vcpu->arch.gpr[0] = svcpu->gpr[0];
vcpu->arch.gpr[1] = svcpu->gpr[1];
vcpu->arch.gpr[2] = svcpu->gpr[2];
vcpu->arch.gpr[3] = svcpu->gpr[3];
vcpu->arch.gpr[4] = svcpu->gpr[4];
vcpu->arch.gpr[5] = svcpu->gpr[5];
vcpu->arch.gpr[6] = svcpu->gpr[6];
vcpu->arch.gpr[7] = svcpu->gpr[7];
vcpu->arch.gpr[8] = svcpu->gpr[8];
vcpu->arch.gpr[9] = svcpu->gpr[9];
vcpu->arch.gpr[10] = svcpu->gpr[10];
vcpu->arch.gpr[11] = svcpu->gpr[11];
vcpu->arch.gpr[12] = svcpu->gpr[12];
vcpu->arch.gpr[13] = svcpu->gpr[13];
vcpu->arch.cr = svcpu->cr;
vcpu->arch.xer = svcpu->xer;
vcpu->arch.ctr = svcpu->ctr;
vcpu->arch.lr = svcpu->lr;
vcpu->arch.pc = svcpu->pc;
vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
vcpu->arch.fault_dar = svcpu->fault_dar;
vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
vcpu->arch.last_inst = svcpu->last_inst;
#ifdef CONFIG_PPC_BOOK3S_64
vcpu->arch.shadow_fscr = svcpu->shadow_fscr;
#endif
/*
* Update purr and spurr using time base on exit.
*/
vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
vcpu->arch.vtb += get_vtb() - vcpu->arch.entry_vtb;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
svcpu->in_use = false;
out:
preempt_enable();
}
static void pseries_dedicated_idle_sleep(void)
{
unsigned int cpu = smp_processor_id();
unsigned long start_snooze;
unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
unsigned long in_purr, out_purr;
/*
* Indicate to the HV that we are idle. Now would be
* a good time to find other work to dispatch.
*/
get_lppaca()->idle = 1;
get_lppaca()->cpuctls_task_attrs = 1;
in_purr = mfspr(SPRN_PURR);
/*
* We come in with interrupts disabled, and need_resched()
* has been checked recently. If we should poll for a little
* while, do so.
*/
if (*smt_snooze_delay) {
start_snooze = get_tb() +
*smt_snooze_delay * tb_ticks_per_usec;
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
while (get_tb() < start_snooze) {
if (need_resched() || cpu_is_offline(cpu))
goto out;
ppc64_runlatch_off();
HMT_low();
HMT_very_low();
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
local_irq_disable();
if (need_resched() || cpu_is_offline(cpu))
goto out;
}
cede_processor();
out:
HMT_medium();
get_lppaca()->cpuctls_task_attrs = 0;
out_purr = mfspr(SPRN_PURR);
get_lppaca()->wait_state_cycles += out_purr - in_purr;
get_lppaca()->idle = 0;
}
/*
* Return the number of jiffies until the next timeout. If the timeout is
* longer than the NEXT_TIMER_MAX_DELTA, then return NEXT_TIMER_MAX_DELTA
* because the larger value can break the timer APIs.
*/
static unsigned long watchdog_next_timeout(struct kvm_vcpu *vcpu)
{
u64 tb, wdt_tb, wdt_ticks = 0;
u64 nr_jiffies = 0;
u32 period = TCR_GET_WP(vcpu->arch.tcr);
wdt_tb = 1ULL << (63 - period);
tb = get_tb();
/*
* The watchdog timeout will hapeen when TB bit corresponding
* to watchdog will toggle from 0 to 1.
*/
if (tb & wdt_tb)
wdt_ticks = wdt_tb;
wdt_ticks += wdt_tb - (tb & (wdt_tb - 1));
/* Convert timebase ticks to jiffies */
nr_jiffies = wdt_ticks;
if (do_div(nr_jiffies, tb_ticks_per_jiffy))
nr_jiffies++;
return min_t(unsigned long long, nr_jiffies, NEXT_TIMER_MAX_DELTA);
}
void kvmppc_vcpu_block(struct kvm_vcpu *vcpu)
{
u64 now;
unsigned long dec_nsec;
now = get_tb();
if (now >= vcpu->arch.dec_expires && !kvmppc_core_pending_dec(vcpu))
kvmppc_core_queue_dec(vcpu);
if (vcpu->arch.pending_exceptions)
return;
if (vcpu->arch.dec_expires != ~(u64)0) {
dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC /
tb_ticks_per_sec;
hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
HRTIMER_MODE_REL);
}
kvmppc_vcpu_blocked(vcpu);
kvm_vcpu_block(vcpu);
vcpu->stat.halt_wakeup++;
if (vcpu->arch.dec_expires != ~(u64)0)
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
kvmppc_vcpu_unblocked(vcpu);
}
void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec;
pr_debug("mtDEC: %x\n", vcpu->arch.dec);
#ifdef CONFIG_PPC_BOOK3S
/* mtdec lowers the interrupt line when positive. */
kvmppc_core_dequeue_dec(vcpu);
/* POWER4+ triggers a dec interrupt if the value is < 0 */
if (vcpu->arch.dec & 0x80000000) {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
kvmppc_core_queue_dec(vcpu);
return;
}
#endif
if (kvmppc_dec_enabled(vcpu)) {
/* The decrementer ticks at the same rate as the timebase, so
* that's how we convert the guest DEC value to the number of
* host ticks. */
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
dec_nsec = vcpu->arch.dec;
dec_nsec *= 1000;
dec_nsec /= tb_ticks_per_usec;
hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
HRTIMER_MODE_REL);
vcpu->arch.dec_jiffies = get_tb();
} else {
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
}
}
/* Activate a secondary processor. */
int __devinit start_secondary(void *unused)
{
unsigned int cpu = smp_processor_id();
atomic_inc(&init_mm.mm_count);
current->active_mm = &init_mm;
smp_store_cpu_info(cpu);
set_dec(tb_ticks_per_jiffy);
preempt_disable();
cpu_callin_map[cpu] = 1;
smp_ops->setup_cpu(cpu);
if (smp_ops->take_timebase)
smp_ops->take_timebase();
if (system_state > SYSTEM_BOOTING)
per_cpu(last_jiffy, cpu) = get_tb();
spin_lock(&call_lock);
cpu_set(cpu, cpu_online_map);
spin_unlock(&call_lock);
local_irq_enable();
cpu_idle();
return 0;
}
/* Copy data needed by real-mode code from vcpu to shadow vcpu */
void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
struct kvm_vcpu *vcpu)
{
svcpu->gpr[0] = vcpu->arch.gpr[0];
svcpu->gpr[1] = vcpu->arch.gpr[1];
svcpu->gpr[2] = vcpu->arch.gpr[2];
svcpu->gpr[3] = vcpu->arch.gpr[3];
svcpu->gpr[4] = vcpu->arch.gpr[4];
svcpu->gpr[5] = vcpu->arch.gpr[5];
svcpu->gpr[6] = vcpu->arch.gpr[6];
svcpu->gpr[7] = vcpu->arch.gpr[7];
svcpu->gpr[8] = vcpu->arch.gpr[8];
svcpu->gpr[9] = vcpu->arch.gpr[9];
svcpu->gpr[10] = vcpu->arch.gpr[10];
svcpu->gpr[11] = vcpu->arch.gpr[11];
svcpu->gpr[12] = vcpu->arch.gpr[12];
svcpu->gpr[13] = vcpu->arch.gpr[13];
svcpu->cr = vcpu->arch.cr;
svcpu->xer = vcpu->arch.xer;
svcpu->ctr = vcpu->arch.ctr;
svcpu->lr = vcpu->arch.lr;
svcpu->pc = vcpu->arch.pc;
#ifdef CONFIG_PPC_BOOK3S_64
svcpu->shadow_fscr = vcpu->arch.shadow_fscr;
#endif
/*
* Now also save the current time base value. We use this
* to find the guest purr and spurr value.
*/
vcpu->arch.entry_tb = get_tb();
vcpu->arch.entry_vtb = get_vtb();
if (cpu_has_feature(CPU_FTR_ARCH_207S))
vcpu->arch.entry_ic = mfspr(SPRN_IC);
svcpu->in_use = true;
}
void ps3_set_pm_bookmark(u64 tag, u64 incident, u64 th_id)
{
u64 bookmark;
bookmark = (get_tb() & 0x00000000FFFFFFFFULL) |
PS3_PM_BOOKMARK_TAG_KERNEL;
bookmark = ((tag << 56) & PS3_PM_BOOKMARK_TAG_MASK_LO) |
(incident << 48) | (th_id << 32) | bookmark;
ps3_set_bookmark(bookmark);
}
static void __devinit cell_give_timebase(void)
{
spin_lock(&timebase_lock);
rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
timebase = get_tb();
spin_unlock(&timebase_lock);
while (timebase)
barrier();
rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
}
int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
u64 now;
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
return -EINTR;
}
flush_fp_to_thread(current);
flush_altivec_to_thread(current);
flush_vsx_to_thread(current);
preempt_disable();
/*
* Make sure we are running on thread 0, and that
* secondary threads are offline.
* XXX we should also block attempts to bring any
* secondary threads online.
*/
if (threads_per_core > 1) {
int cpu = smp_processor_id();
int thr = cpu_thread_in_core(cpu);
if (thr)
goto out;
while (++thr < threads_per_core)
if (cpu_online(cpu + thr))
goto out;
}
kvm_guest_enter();
__kvmppc_vcore_entry(NULL, vcpu);
kvm_guest_exit();
preempt_enable();
kvm_resched(vcpu);
now = get_tb();
/* cancel pending dec exception if dec is positive */
if (now < vcpu->arch.dec_expires && kvmppc_core_pending_dec(vcpu))
kvmppc_core_dequeue_dec(vcpu);
return kvmppc_handle_exit(run, vcpu, current);
out:
preempt_enable();
return -EBUSY;
}
void rtas_get_rtc_time(struct rtc_time *rtc_tm)
{
int ret[8];
int error;
unsigned int wait_time;
u64 max_wait_tb;
max_wait_tb = get_tb() + tb_ticks_per_usec * 1000 * MAX_RTC_WAIT;
do {
error = rtas_call(rtas_token("get-time-of-day"), 0, 8, ret);
wait_time = rtas_busy_delay_time(error);
if (wait_time) {
if (in_interrupt()) {
memset(rtc_tm, 0, sizeof(struct rtc_time));
printk_ratelimited(KERN_WARNING
"error: reading clock "
"would delay interrupt\n");
return; /* */
}
msleep(wait_time);
}
} while (wait_time && (get_tb() < max_wait_tb));
if (error != 0) {
printk_ratelimited(KERN_WARNING
"error: reading the clock failed (%d)\n",
error);
return;
}
rtc_tm->tm_sec = ret[5];
rtc_tm->tm_min = ret[4];
rtc_tm->tm_hour = ret[3];
rtc_tm->tm_mday = ret[2];
rtc_tm->tm_mon = ret[1] - 1;
rtc_tm->tm_year = ret[0] - 1900;
}
/*
* timer_interrupt - gets called when the decrementer overflows,
* with interrupts disabled.
*/
int timer_interrupt(struct pt_regs * regs)
{
int next_dec;
unsigned long cur_tb;
struct paca_struct *lpaca = get_paca();
unsigned long cpu = lpaca->xPacaIndex;
irq_enter();
#ifndef CONFIG_PPC_ISERIES
ppc64_do_profile(regs);
#endif
lpaca->xLpPaca.xIntDword.xFields.xDecrInt = 0;
while (lpaca->next_jiffy_update_tb <= (cur_tb = get_tb())) {
#ifdef CONFIG_SMP
smp_local_timer_interrupt(regs);
#endif
if (cpu == boot_cpuid) {
write_seqlock(&xtime_lock);
tb_last_stamp = lpaca->next_jiffy_update_tb;
do_timer(regs);
timer_sync_xtime( cur_tb );
timer_check_rtc();
write_sequnlock(&xtime_lock);
if ( adjusting_time && (time_adjust == 0) )
ppc_adjtimex();
}
lpaca->next_jiffy_update_tb += tb_ticks_per_jiffy;
}
next_dec = lpaca->next_jiffy_update_tb - cur_tb;
if (next_dec > lpaca->default_decr)
next_dec = lpaca->default_decr;
set_dec(next_dec);
#ifdef CONFIG_PPC_ISERIES
{
struct ItLpQueue *lpq = lpaca->lpQueuePtr;
if (lpq && ItLpQueue_isLpIntPending(lpq))
lpEvent_count += ItLpQueue_process(lpq, regs);
}
#endif
irq_exit();
return 1;
}
/*
* Real-mode H_CONFER implementation.
* We check if we are the only vcpu out of this virtual core
* still running in the guest and not ceded. If so, we pop up
* to the virtual-mode implementation; if not, just return to
* the guest.
*/
long int kvmppc_rm_h_confer(struct kvm_vcpu *vcpu, int target,
unsigned int yield_count)
{
struct kvmppc_vcore *vc = vcpu->arch.vcore;
int threads_running;
int threads_ceded;
int threads_conferring;
u64 stop = get_tb() + 10 * tb_ticks_per_usec;
int rv = H_SUCCESS; /* => don't yield */
set_bit(vcpu->arch.ptid, &vc->conferring_threads);
while ((get_tb() < stop) && (VCORE_EXIT_COUNT(vc) == 0)) {
threads_running = VCORE_ENTRY_COUNT(vc);
threads_ceded = hweight32(vc->napping_threads);
threads_conferring = hweight32(vc->conferring_threads);
if (threads_ceded + threads_conferring >= threads_running) {
rv = H_TOO_HARD; /* => do yield */
break;
}
}
clear_bit(vcpu->arch.ptid, &vc->conferring_threads);
return rv;
}
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
u64 snooze_exit_time;
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
snooze_exit_time = get_tb() + snooze_timeout;
ppc64_runlatch_off();
while (!need_resched()) {
HMT_low();
HMT_very_low();
if (snooze_timeout_en && get_tb() > snooze_exit_time)
break;
}
HMT_medium();
ppc64_runlatch_on();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
return index;
}
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
unsigned long in_purr;
ktime_t kt_before;
unsigned long start_snooze;
long snooze = drv->states[0].target_residency;
idle_loop_prolog(&in_purr, &kt_before);
if (snooze) {
start_snooze = get_tb() + snooze * tb_ticks_per_usec;
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
while ((snooze < 0) || (get_tb() < start_snooze)) {
if (need_resched() || cpu_is_offline(dev->cpu))
goto out;
ppc64_runlatch_off();
HMT_low();
HMT_very_low();
}
HMT_medium();
clear_thread_flag(TIF_POLLING_NRFLAG);
smp_mb();
local_irq_disable();
}
out:
HMT_medium();
dev->last_residency =
(int)idle_loop_epilog(in_purr, kt_before);
return index;
}
/*
* Real-mode H_CONFER implementation.
* We check if we are the only vcpu out of this virtual core
* still running in the guest and not ceded. If so, we pop up
* to the virtual-mode implementation; if not, just return to
* the guest.
*/
long int kvmppc_rm_h_confer(struct kvm_vcpu *vcpu, int target,
unsigned int yield_count)
{
struct kvmppc_vcore *vc = local_paca->kvm_hstate.kvm_vcore;
int ptid = local_paca->kvm_hstate.ptid;
int threads_running;
int threads_ceded;
int threads_conferring;
u64 stop = get_tb() + 10 * tb_ticks_per_usec;
int rv = H_SUCCESS; /* => don't yield */
set_bit(ptid, &vc->conferring_threads);
while ((get_tb() < stop) && !VCORE_IS_EXITING(vc)) {
threads_running = VCORE_ENTRY_MAP(vc);
threads_ceded = vc->napping_threads;
threads_conferring = vc->conferring_threads;
if ((threads_ceded | threads_conferring) == threads_running) {
rv = H_TOO_HARD; /* => do yield */
break;
}
}
clear_bit(ptid, &vc->conferring_threads);
return rv;
}
void rtas_give_timebase(void)
{
unsigned long flags;
local_irq_save(flags);
hard_irq_disable();
arch_spin_lock(&timebase_lock);
rtas_call(rtas_token("freeze-time-base"), 0, 1, NULL);
timebase = get_tb();
arch_spin_unlock(&timebase_lock);
while (timebase)
barrier();
rtas_call(rtas_token("thaw-time-base"), 0, 1, NULL);
local_irq_restore(flags);
}
static int proc_titantod_show(struct seq_file *m, void *v)
{
unsigned long tb0, titan_tod;
tb0 = get_tb();
titan_tod = HvCallXm_loadTod();
seq_printf(m, "Titan\n" );
seq_printf(m, " time base = %016lx\n", tb0);
seq_printf(m, " titan tod = %016lx\n", titan_tod);
seq_printf(m, " xProcFreq = %016x\n",
xIoHriProcessorVpd[0].xProcFreq);
seq_printf(m, " xTimeBaseFreq = %016x\n",
xIoHriProcessorVpd[0].xTimeBaseFreq);
seq_printf(m, " tb_ticks_per_jiffy = %lu\n", tb_ticks_per_jiffy);
seq_printf(m, " tb_ticks_per_usec = %lu\n", tb_ticks_per_usec);
if (!startTitan) {
startTitan = titan_tod;
startTb = tb0;
} else {
unsigned long titan_usec = (titan_tod - startTitan) >> 12;
unsigned long tb_ticks = (tb0 - startTb);
unsigned long titan_jiffies = titan_usec / (1000000/HZ);
unsigned long titan_jiff_usec = titan_jiffies * (1000000/HZ);
unsigned long titan_jiff_rem_usec =
titan_usec - titan_jiff_usec;
unsigned long tb_jiffies = tb_ticks / tb_ticks_per_jiffy;
unsigned long tb_jiff_ticks = tb_jiffies * tb_ticks_per_jiffy;
unsigned long tb_jiff_rem_ticks = tb_ticks - tb_jiff_ticks;
unsigned long tb_jiff_rem_usec =
tb_jiff_rem_ticks / tb_ticks_per_usec;
unsigned long new_tb_ticks_per_jiffy =
(tb_ticks * (1000000/HZ))/titan_usec;
seq_printf(m, " titan elapsed = %lu uSec\n", titan_usec);
seq_printf(m, " tb elapsed = %lu ticks\n", tb_ticks);
seq_printf(m, " titan jiffies = %lu.%04lu \n", titan_jiffies,
titan_jiff_rem_usec);
seq_printf(m, " tb jiffies = %lu.%04lu\n", tb_jiffies,
tb_jiff_rem_usec);
seq_printf(m, " new tb_ticks_per_jiffy = %lu\n",
new_tb_ticks_per_jiffy);
}
return 0;
}
static void get_sregs_base(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
u64 tb = get_tb();
sregs->u.e.features |= KVM_SREGS_E_BASE;
sregs->u.e.csrr0 = vcpu->arch.csrr0;
sregs->u.e.csrr1 = vcpu->arch.csrr1;
sregs->u.e.mcsr = vcpu->arch.mcsr;
sregs->u.e.esr = vcpu->arch.shared->esr;
sregs->u.e.dear = vcpu->arch.shared->dar;
sregs->u.e.tsr = vcpu->arch.tsr;
sregs->u.e.tcr = vcpu->arch.tcr;
sregs->u.e.dec = kvmppc_get_dec(vcpu, tb);
sregs->u.e.tb = tb;
sregs->u.e.vrsave = vcpu->arch.vrsave;
}
int proc_get_titanTod
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
int len = 0;
unsigned long tb0, titan_tod;
tb0 = get_tb();
titan_tod = HvCallXm_loadTod();
len += sprintf( page+len, "Titan\n" );
len += sprintf( page+len, " time base = %016lx\n", tb0 );
len += sprintf( page+len, " titan tod = %016lx\n", titan_tod );
len += sprintf( page+len, " xProcFreq = %016x\n", xIoHriProcessorVpd[0].xProcFreq );
len += sprintf( page+len, " xTimeBaseFreq = %016x\n", xIoHriProcessorVpd[0].xTimeBaseFreq );
len += sprintf( page+len, " tb_ticks_per_jiffy = %lu\n", tb_ticks_per_jiffy );
len += sprintf( page+len, " tb_ticks_per_usec = %lu\n", tb_ticks_per_usec );
if ( !startTitan ) {
startTitan = titan_tod;
startTb = tb0;
}
else {
unsigned long titan_usec = (titan_tod - startTitan) >> 12;
unsigned long tb_ticks = (tb0 - startTb);
unsigned long titan_jiffies = titan_usec / (1000000/HZ);
unsigned long titan_jiff_usec = titan_jiffies * (1000000/HZ);
unsigned long titan_jiff_rem_usec = titan_usec - titan_jiff_usec;
unsigned long tb_jiffies = tb_ticks / tb_ticks_per_jiffy;
unsigned long tb_jiff_ticks = tb_jiffies * tb_ticks_per_jiffy;
unsigned long tb_jiff_rem_ticks = tb_ticks - tb_jiff_ticks;
unsigned long tb_jiff_rem_usec = tb_jiff_rem_ticks / tb_ticks_per_usec;
unsigned long new_tb_ticks_per_jiffy = (tb_ticks * (1000000/HZ))/titan_usec;
len += sprintf( page+len, " titan elapsed = %lu uSec\n", titan_usec);
len += sprintf( page+len, " tb elapsed = %lu ticks\n", tb_ticks);
len += sprintf( page+len, " titan jiffies = %lu.%04lu \n", titan_jiffies, titan_jiff_rem_usec );
len += sprintf( page+len, " tb jiffies = %lu.%04lu\n", tb_jiffies, tb_jiff_rem_usec );
len += sprintf( page+len, " new tb_ticks_per_jiffy = %lu\n", new_tb_ticks_per_jiffy );
}
return pmc_calc_metrics( page, start, off, count, eof, len );
}
void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
unsigned long dec_nsec;
unsigned long long dec_time;
pr_debug("mtDEC: %x\n", vcpu->arch.dec);
hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
#ifdef CONFIG_PPC_BOOK3S
/* mtdec lowers the interrupt line when positive. */
kvmppc_core_dequeue_dec(vcpu);
/* POWER4+ triggers a dec interrupt if the value is < 0 */
if (vcpu->arch.dec & 0x80000000) {
kvmppc_core_queue_dec(vcpu);
return;
}
#endif
#ifdef CONFIG_BOOKE
/* On BOOKE, DEC = 0 is as good as decrementer not enabled */
if (vcpu->arch.dec == 0)
return;
#endif
/*
* The decrementer ticks at the same rate as the timebase, so
* that's how we convert the guest DEC value to the number of
* host ticks.
*/
dec_time = vcpu->arch.dec;
/*
* Guest timebase ticks at the same frequency as host decrementer.
* So use the host decrementer calculations for decrementer emulation.
*/
dec_time = dec_time << decrementer_clockevent.shift;
do_div(dec_time, decrementer_clockevent.mult);
dec_nsec = do_div(dec_time, NSEC_PER_SEC);
hrtimer_start(&vcpu->arch.dec_timer,
ktime_set(dec_time, dec_nsec), HRTIMER_MODE_REL);
vcpu->arch.dec_jiffies = get_tb();
}
static void iSeries_tb_recal(void)
{
struct div_result divres;
unsigned long titan, tb;
tb = get_tb();
titan = HvCallXm_loadTod();
if ( iSeries_recal_titan ) {
unsigned long tb_ticks = tb - iSeries_recal_tb;
unsigned long titan_usec = (titan - iSeries_recal_titan) >> 12;
unsigned long new_tb_ticks_per_sec = (tb_ticks * USEC_PER_SEC)/titan_usec;
unsigned long new_tb_ticks_per_jiffy = (new_tb_ticks_per_sec+(HZ/2))/HZ;
long tick_diff = new_tb_ticks_per_jiffy - tb_ticks_per_jiffy;
char sign = '+';
/* make sure tb_ticks_per_sec and tb_ticks_per_jiffy are consistent */
new_tb_ticks_per_sec = new_tb_ticks_per_jiffy * HZ;
if ( tick_diff < 0 ) {
tick_diff = -tick_diff;
sign = '-';
}
if ( tick_diff ) {
if ( tick_diff < tb_ticks_per_jiffy/25 ) {
printk( "Titan recalibrate: new tb_ticks_per_jiffy = %lu (%c%ld)\n",
new_tb_ticks_per_jiffy, sign, tick_diff );
tb_ticks_per_jiffy = new_tb_ticks_per_jiffy;
tb_ticks_per_sec = new_tb_ticks_per_sec;
div128_by_32( XSEC_PER_SEC, 0, tb_ticks_per_sec, &divres );
do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
tb_to_xs = divres.result_low;
do_gtod.varp->tb_to_xs = tb_to_xs;
}
else {
printk( "Titan recalibrate: FAILED (difference > 4 percent)\n"
" new tb_ticks_per_jiffy = %lu\n"
" old tb_ticks_per_jiffy = %lu\n",
new_tb_ticks_per_jiffy, tb_ticks_per_jiffy );
}
}
}
iSeries_recal_titan = titan;
iSeries_recal_tb = tb;
}
void ps3_disable_pm(u32 cpu)
{
int result;
u64 tmp;
ps3_set_bookmark(get_tb() | PS3_PM_BOOKMARK_STOP);
result = lv1_stop_lpm(lpm_priv->lpm_id, &tmp);
if (result) {
if(result != LV1_WRONG_STATE)
dev_err(sbd_core(), "%s:%u: lv1_stop_lpm failed: %s\n",
__func__, __LINE__, ps3_result(result));
return;
}
lpm_priv->tb_count = tmp;
dev_dbg(sbd_core(), "%s:%u: tb_count %llu (%llxh)\n", __func__, __LINE__,
lpm_priv->tb_count, lpm_priv->tb_count);
}
static void yield_shared_processor(void)
{
unsigned long tb;
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);
/*
* The decrementer stops during the yield. Force a fake decrementer
* here and let the timer_interrupt code sort out the actual time.
*/
get_lppaca()->int_dword.fields.decr_int = 1;
ppc64_runlatch_on();
process_iSeries_events();
}
static void smp_core99_give_timebase(void)
{
/* Open i2c bus for synchronous access */
if (pmac_low_i2c_open(pmac_tb_clock_chip_host, 0))
panic("Can't open i2c for TB sync !\n");
spin_lock(&timebase_lock);
(*pmac_tb_freeze)(1);
mb();
timebase = get_tb();
spin_unlock(&timebase_lock);
while (timebase)
barrier();
spin_lock(&timebase_lock);
(*pmac_tb_freeze)(0);
spin_unlock(&timebase_lock);
/* Close i2c bus */
pmac_low_i2c_close(pmac_tb_clock_chip_host);
}
void __init time_init(void)
{
/* This function is only called on the boot processor */
unsigned long flags;
struct rtc_time tm;
ppc_md.calibrate_decr();
#ifdef CONFIG_PPC_ISERIES
if (!piranha_simulator)
#endif
ppc_md.get_boot_time(&tm);
write_seqlock_irqsave(&xtime_lock, flags);
xtime.tv_sec = mktime(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
tb_last_stamp = get_tb();
do_gtod.tb_orig_stamp = tb_last_stamp;
do_gtod.varp = &do_gtod.vars[0];
do_gtod.var_idx = 0;
do_gtod.varp->stamp_xsec = xtime.tv_sec * XSEC_PER_SEC;
do_gtod.tb_ticks_per_sec = tb_ticks_per_sec;
do_gtod.varp->tb_to_xs = tb_to_xs;
do_gtod.tb_to_us = tb_to_us;
xtime_sync_interval = tb_ticks_per_sec - (tb_ticks_per_sec/8);
next_xtime_sync_tb = tb_last_stamp + xtime_sync_interval;
time_freq = 0;
xtime.tv_nsec = 0;
last_rtc_update = xtime.tv_sec;
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
write_sequnlock_irqrestore(&xtime_lock, flags);
/* Not exact, but the timer interrupt takes care of this */
set_dec(tb_ticks_per_jiffy);
}