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[MIPS] time: SMP/NUMA-proofing of IP27 HUB RT timer code.

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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2007-10-22 10:34:13 +01:00
parent 508a775a3c
commit 06d428d719
2 changed files with 81 additions and 73 deletions
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2
arch/mips/sgi-ip27/ip27-init.c
View File

@ -110,7 +110,7 @@ static void __init per_hub_init(cnodeid_t cnode)
}
}
void __init per_cpu_init(void)
void __cpuinit per_cpu_init(void)
{
int cpu = smp_processor_id();
int slice = LOCAL_HUB_L(PI_CPU_NUM);

152
arch/mips/sgi-ip27/ip27-timer.c
View File

@ -111,46 +111,6 @@ unsigned long read_persistent_clock(void)
return mktime(year, month, date, hour, min, sec);
}
static int rt_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
unsigned int cpu = smp_processor_id();
int slice = cputoslice(cpu) == 0;
unsigned long cnt;
cnt = LOCAL_HUB_L(PI_RT_COUNT);
cnt += delta;
LOCAL_HUB_S(slice ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, cnt);
return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
}
static void rt_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
/* The only mode supported */
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_RESUME:
/* Nothing to do */
break;
}
}
struct clock_event_device rt_clock_event_device = {
.name = "HUB-RT",
.features = CLOCK_EVT_FEAT_ONESHOT,
.rating = 300,
.set_next_event = rt_set_next_event,
.set_mode = rt_set_mode,
};
static void enable_rt_irq(unsigned int irq)
{
}
@ -168,11 +128,41 @@ static struct irq_chip rt_irq_type = {
.eoi = enable_rt_irq,
};
static int rt_next_event(unsigned long delta, struct clock_event_device *evt)
{
unsigned int cpu = smp_processor_id();
int slice = cputoslice(cpu) == 0;
unsigned long cnt;
cnt = LOCAL_HUB_L(PI_RT_COUNT);
cnt += delta;
LOCAL_HUB_S(slice ? PI_RT_COMPARE_A : PI_RT_COMPARE_B, cnt);
return LOCAL_HUB_L(PI_RT_COUNT) >= cnt ? -ETIME : 0;
}
static void rt_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
/* The only mode supported */
break;
case CLOCK_EVT_MODE_PERIODIC:
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_RESUME:
/* Nothing to do */
break;
}
}
unsigned int rt_timer_irq;
static irqreturn_t ip27_rt_timer_interrupt(int irq, void *dev_id)
static irqreturn_t hub_rt_counter_handler(int irq, void *dev_id)
{
struct clock_event_device *cd = &rt_clock_event_device;
struct clock_event_device *cd = dev_id;
unsigned int cpu = smp_processor_id();
int slice = cputoslice(cpu) == 0;
@ -182,11 +172,10 @@ static irqreturn_t ip27_rt_timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static struct irqaction rt_irqaction = {
.handler = (irq_handler_t) ip27_rt_timer_interrupt,
.flags = IRQF_DISABLED,
.mask = CPU_MASK_NONE,
.name = "timer"
struct irqaction hub_rt_irqaction = {
.handler = hub_rt_counter_handler,
.flags = IRQF_DISABLED | IRQF_PERCPU,
.name = "hub-rt",
};
/*
@ -200,32 +189,48 @@ static struct irqaction rt_irqaction = {
#define NSEC_PER_CYCLE 800
#define CYCLES_PER_SEC (NSEC_PER_SEC / NSEC_PER_CYCLE)
static void __init ip27_rt_clock_event_init(void)
static DEFINE_PER_CPU(struct clock_event_device, hub_rt_clockevent);
static DEFINE_PER_CPU(char [11], hub_rt_name);
static void __cpuinit hub_rt_clock_event_init(void)
{
struct clock_event_device *cd = &rt_clock_event_device;
unsigned int cpu = smp_processor_id();
int irq = allocate_irqno();
if (irq < 0)
panic("Can't allocate interrupt number for timer interrupt");
rt_timer_irq = irq;
struct clock_event_device *cd = &per_cpu(hub_rt_clockevent, cpu);
unsigned char *name = per_cpu(hub_rt_name, cpu);
int irq = rt_timer_irq;
sprintf(name, "hub-rt %d", cpu);
cd->name = "HUB-RT",
cd->features = CLOCK_EVT_FEAT_ONESHOT,
clockevent_set_clock(cd, CYCLES_PER_SEC);
cd->max_delta_ns = clockevent_delta2ns(0xfffffffffffff, cd);
cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
cd->rating = 200,
cd->irq = irq,
cd->cpumask = cpumask_of_cpu(cpu),
/*
* Calculate the min / max delta
*/
cd->mult =
div_sc((unsigned long) CYCLES_PER_SEC, NSEC_PER_SEC, 32);
cd->shift = 32;
cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
cd->rating = 300,
cd->set_next_event = rt_next_event,
cd->set_mode = rt_set_mode,
clockevents_register_device(cd);
}
static void __init hub_rt_clock_event_global_init(void)
{
unsigned int irq;
do {
smp_wmb();
irq = rt_timer_irq;
if (irq)
break;
irq = allocate_irqno();
if (irq < 0)
panic("Allocation of irq number for timer failed");
} while (xchg(&rt_timer_irq, irq));
set_irq_chip_and_handler(irq, &rt_irq_type, handle_percpu_irq);
setup_irq(irq, &rt_irqaction);
setup_irq(irq, &hub_rt_irqaction);
}
static cycle_t hub_rt_read(void)
@ -233,27 +238,29 @@ static cycle_t hub_rt_read(void)
return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
}
struct clocksource ht_rt_clocksource = {
struct clocksource hub_rt_clocksource = {
.name = "HUB-RT",
.rating = 200,
.read = hub_rt_read,
.mask = CLOCKSOURCE_MASK(52),
.shift = 32,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init ip27_rt_clocksource_init(void)
static void __init hub_rt_clocksource_init(void)
{
clocksource_register(&ht_rt_clocksource);
struct clocksource *cs = &hub_rt_clocksource;
clocksource_set_clock(cs, CYCLES_PER_SEC);
clocksource_register(cs);
}
void __init plat_time_init(void)
{
ip27_rt_clock_event_init();
ip27_rt_clocksource_init();
hub_rt_clocksource_init();
hub_rt_clock_event_global_init();
}
void __init cpu_time_init(void)
void __cpuinit cpu_time_init(void)
{
lboard_t *board;
klcpu_t *cpu;
@ -271,6 +278,7 @@ void __init cpu_time_init(void)
printk("CPU %d clock is %dMHz.\n", smp_processor_id(), cpu->cpu_speed);
hub_rt_clock_event_init();
set_c0_status(SRB_TIMOCLK);
}