alpha: Switch to GENERIC_CLOCKEVENTS
This allows us to get rid of some hacky code for SMP. Get rid of some cycle counter hackery that's now handled by generic code via clocksource + clock_event_device objects. Signed-off-by: Richard Henderson <rth@twiddle.net>hifive-unleashed-5.1
Richard Henderson
Matt Turner
parent
db2d326061
commit
a1659d6d12
|
|
@ -16,6 +16,7 @@ config ALPHA
|
|||
select ARCH_WANT_IPC_PARSE_VERSION
|
||||
select ARCH_HAVE_NMI_SAFE_CMPXCHG
|
||||
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
|
||||
select GENERIC_CLOCKEVENTS
|
||||
select GENERIC_SMP_IDLE_THREAD
|
||||
select GENERIC_STRNCPY_FROM_USER
|
||||
select GENERIC_STRNLEN_USER
|
||||
|
|
|
|||
|
|
@ -66,21 +66,7 @@ do_entInt(unsigned long type, unsigned long vector,
|
|||
break;
|
||||
case 1:
|
||||
old_regs = set_irq_regs(regs);
|
||||
#ifdef CONFIG_SMP
|
||||
{
|
||||
long cpu;
|
||||
|
||||
smp_percpu_timer_interrupt(regs);
|
||||
cpu = smp_processor_id();
|
||||
if (cpu != boot_cpuid) {
|
||||
kstat_incr_irqs_this_cpu(RTC_IRQ, irq_to_desc(RTC_IRQ));
|
||||
} else {
|
||||
handle_irq(RTC_IRQ);
|
||||
}
|
||||
}
|
||||
#else
|
||||
handle_irq(RTC_IRQ);
|
||||
#endif
|
||||
set_irq_regs(old_regs);
|
||||
return;
|
||||
case 2:
|
||||
|
|
|
|||
|
|
@ -135,13 +135,13 @@ extern void unregister_srm_console(void);
|
|||
/* smp.c */
|
||||
extern void setup_smp(void);
|
||||
extern void handle_ipi(struct pt_regs *);
|
||||
extern void smp_percpu_timer_interrupt(struct pt_regs *);
|
||||
|
||||
/* bios32.c */
|
||||
/* extern void reset_for_srm(void); */
|
||||
|
||||
/* time.c */
|
||||
extern irqreturn_t timer_interrupt(int irq, void *dev);
|
||||
extern void init_clockevent(void);
|
||||
extern void common_init_rtc(void);
|
||||
extern unsigned long est_cycle_freq;
|
||||
|
||||
|
|
|
|||
|
|
@ -138,9 +138,11 @@ smp_callin(void)
|
|||
|
||||
/* Get our local ticker going. */
|
||||
smp_setup_percpu_timer(cpuid);
|
||||
init_clockevent();
|
||||
|
||||
/* Call platform-specific callin, if specified */
|
||||
if (alpha_mv.smp_callin) alpha_mv.smp_callin();
|
||||
if (alpha_mv.smp_callin)
|
||||
alpha_mv.smp_callin();
|
||||
|
||||
/* All kernel threads share the same mm context. */
|
||||
atomic_inc(&init_mm.mm_count);
|
||||
|
|
@ -498,35 +500,6 @@ smp_cpus_done(unsigned int max_cpus)
|
|||
((bogosum + 2500) / (5000/HZ)) % 100);
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
smp_percpu_timer_interrupt(struct pt_regs *regs)
|
||||
{
|
||||
struct pt_regs *old_regs;
|
||||
int cpu = smp_processor_id();
|
||||
unsigned long user = user_mode(regs);
|
||||
struct cpuinfo_alpha *data = &cpu_data[cpu];
|
||||
|
||||
old_regs = set_irq_regs(regs);
|
||||
|
||||
/* Record kernel PC. */
|
||||
profile_tick(CPU_PROFILING);
|
||||
|
||||
if (!--data->prof_counter) {
|
||||
/* We need to make like a normal interrupt -- otherwise
|
||||
timer interrupts ignore the global interrupt lock,
|
||||
which would be a Bad Thing. */
|
||||
irq_enter();
|
||||
|
||||
update_process_times(user);
|
||||
|
||||
data->prof_counter = data->prof_multiplier;
|
||||
|
||||
irq_exit();
|
||||
}
|
||||
set_irq_regs(old_regs);
|
||||
}
|
||||
|
||||
int
|
||||
setup_profiling_timer(unsigned int multiplier)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -42,6 +42,7 @@
|
|||
#include <linux/time.h>
|
||||
#include <linux/timex.h>
|
||||
#include <linux/clocksource.h>
|
||||
#include <linux/clockchips.h>
|
||||
|
||||
#include "proto.h"
|
||||
#include "irq_impl.h"
|
||||
|
|
@ -49,25 +50,6 @@
|
|||
DEFINE_SPINLOCK(rtc_lock);
|
||||
EXPORT_SYMBOL(rtc_lock);
|
||||
|
||||
#define TICK_SIZE (tick_nsec / 1000)
|
||||
|
||||
/*
|
||||
* Shift amount by which scaled_ticks_per_cycle is scaled. Shifting
|
||||
* by 48 gives us 16 bits for HZ while keeping the accuracy good even
|
||||
* for large CPU clock rates.
|
||||
*/
|
||||
#define FIX_SHIFT 48
|
||||
|
||||
/* lump static variables together for more efficient access: */
|
||||
static struct {
|
||||
/* cycle counter last time it got invoked */
|
||||
__u32 last_time;
|
||||
/* ticks/cycle * 2^48 */
|
||||
unsigned long scaled_ticks_per_cycle;
|
||||
/* partial unused tick */
|
||||
unsigned long partial_tick;
|
||||
} state;
|
||||
|
||||
unsigned long est_cycle_freq;
|
||||
|
||||
#ifdef CONFIG_IRQ_WORK
|
||||
|
|
@ -96,49 +78,64 @@ static inline __u32 rpcc(void)
|
|||
return __builtin_alpha_rpcc();
|
||||
}
|
||||
|
||||
|
||||
|
||||
/*
|
||||
* timer_interrupt() needs to keep up the real-time clock,
|
||||
* as well as call the "xtime_update()" routine every clocktick
|
||||
* The RTC as a clock_event_device primitive.
|
||||
*/
|
||||
irqreturn_t timer_interrupt(int irq, void *dev)
|
||||
|
||||
static DEFINE_PER_CPU(struct clock_event_device, cpu_ce);
|
||||
|
||||
irqreturn_t
|
||||
timer_interrupt(int irq, void *dev)
|
||||
{
|
||||
unsigned long delta;
|
||||
__u32 now;
|
||||
long nticks;
|
||||
int cpu = smp_processor_id();
|
||||
struct clock_event_device *ce = &per_cpu(cpu_ce, cpu);
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
/* Not SMP, do kernel PC profiling here. */
|
||||
profile_tick(CPU_PROFILING);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Calculate how many ticks have passed since the last update,
|
||||
* including any previous partial leftover. Save any resulting
|
||||
* fraction for the next pass.
|
||||
*/
|
||||
now = rpcc();
|
||||
delta = now - state.last_time;
|
||||
state.last_time = now;
|
||||
delta = delta * state.scaled_ticks_per_cycle + state.partial_tick;
|
||||
state.partial_tick = delta & ((1UL << FIX_SHIFT) - 1);
|
||||
nticks = delta >> FIX_SHIFT;
|
||||
|
||||
if (nticks)
|
||||
xtime_update(nticks);
|
||||
/* Don't run the hook for UNUSED or SHUTDOWN. */
|
||||
if (likely(ce->mode == CLOCK_EVT_MODE_PERIODIC))
|
||||
ce->event_handler(ce);
|
||||
|
||||
if (test_irq_work_pending()) {
|
||||
clear_irq_work_pending();
|
||||
irq_work_run();
|
||||
}
|
||||
|
||||
#ifndef CONFIG_SMP
|
||||
while (nticks--)
|
||||
update_process_times(user_mode(get_irq_regs()));
|
||||
#endif
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static void
|
||||
rtc_ce_set_mode(enum clock_event_mode mode, struct clock_event_device *ce)
|
||||
{
|
||||
/* The mode member of CE is updated in generic code.
|
||||
Since we only support periodic events, nothing to do. */
|
||||
}
|
||||
|
||||
static int
|
||||
rtc_ce_set_next_event(unsigned long evt, struct clock_event_device *ce)
|
||||
{
|
||||
/* This hook is for oneshot mode, which we don't support. */
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
void __init
|
||||
init_clockevent(void)
|
||||
{
|
||||
int cpu = smp_processor_id();
|
||||
struct clock_event_device *ce = &per_cpu(cpu_ce, cpu);
|
||||
|
||||
*ce = (struct clock_event_device){
|
||||
.name = "rtc",
|
||||
.features = CLOCK_EVT_FEAT_PERIODIC,
|
||||
.rating = 100,
|
||||
.cpumask = cpumask_of(cpu),
|
||||
.set_mode = rtc_ce_set_mode,
|
||||
.set_next_event = rtc_ce_set_next_event,
|
||||
};
|
||||
|
||||
clockevents_config_and_register(ce, CONFIG_HZ, 0, 0);
|
||||
}
|
||||
|
||||
void __init
|
||||
common_init_rtc(void)
|
||||
{
|
||||
|
|
@ -372,22 +369,9 @@ time_init(void)
|
|||
clocksource_register_hz(&clocksource_rpcc, cycle_freq);
|
||||
#endif
|
||||
|
||||
/* From John Bowman <bowman@math.ualberta.ca>: allow the values
|
||||
to settle, as the Update-In-Progress bit going low isn't good
|
||||
enough on some hardware. 2ms is our guess; we haven't found
|
||||
bogomips yet, but this is close on a 500Mhz box. */
|
||||
__delay(1000000);
|
||||
|
||||
if (HZ > (1<<16)) {
|
||||
extern void __you_loose (void);
|
||||
__you_loose();
|
||||
}
|
||||
|
||||
state.last_time = cc1;
|
||||
state.scaled_ticks_per_cycle
|
||||
= ((unsigned long) HZ << FIX_SHIFT) / cycle_freq;
|
||||
state.partial_tick = 0L;
|
||||
|
||||
/* Startup the timer source. */
|
||||
alpha_mv.init_rtc();
|
||||
|
||||
/* Start up the clock event device. */
|
||||
init_clockevent();
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue