Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=06d428d719dece96c01532b62df4140f4e69a308
Commit: 06d428d719dece96c01532b62df4140f4e69a308
Parent: 508a775a3c9c6c3f952338f6722ea8bc92899962
Author: Ralf Baechle <[EMAIL PROTECTED]>
AuthorDate: Mon Oct 22 10:34:13 2007 +0100
Committer: Ralf Baechle <[EMAIL PROTECTED]>
CommitDate: Mon Oct 22 22:09:00 2007 +0100
[MIPS] time: SMP/NUMA-proofing of IP27 HUB RT timer code.
Signed-off-by: Ralf Baechle <[EMAIL PROTECTED]>
---
arch/mips/sgi-ip27/ip27-init.c | 2 +-
arch/mips/sgi-ip27/ip27-timer.c | 134 +++++++++++++++++++++------------------
2 files changed, 72 insertions(+), 64 deletions(-)
diff --git a/arch/mips/sgi-ip27/ip27-init.c b/arch/mips/sgi-ip27/ip27-init.c
index 681b593..3305fa9 100644
--- a/arch/mips/sgi-ip27/ip27-init.c
+++ b/arch/mips/sgi-ip27/ip27-init.c
@@ -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);
diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index d467bf4..f5dccf0 100644
--- a/arch/mips/sgi-ip27/ip27-timer.c
+++ b/arch/mips/sgi-ip27/ip27-timer.c
@@ -111,8 +111,24 @@ 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)
+static void enable_rt_irq(unsigned int irq)
+{
+}
+
+static void disable_rt_irq(unsigned int irq)
+{
+}
+
+static struct irq_chip rt_irq_type = {
+ .name = "SN HUB RT timer",
+ .ack = disable_rt_irq,
+ .mask = disable_rt_irq,
+ .mask_ack = disable_rt_irq,
+ .unmask = enable_rt_irq,
+ .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;
@@ -129,50 +145,24 @@ static void rt_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
+ 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_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)
-{
-}
-
-static void disable_rt_irq(unsigned int irq)
-{
-}
-
-static struct irq_chip rt_irq_type = {
- .name = "SN HUB RT timer",
- .ack = disable_rt_irq,
- .mask = disable_rt_irq,
- .mask_ack = disable_rt_irq,
- .unmask = enable_rt_irq,
- .eoi = enable_rt_irq,
-};
-
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);
}
-
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