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>
This commit is contained in:
Richard Henderson
Matt Turner
parent
db2d326061
commit
a1659d6d12
5 changed files with 54 additions and 110 deletions
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@ -16,6 +16,7 @@ config ALPHA
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select ARCH_WANT_IPC_PARSE_VERSION
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select ARCH_HAVE_NMI_SAFE_CMPXCHG
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select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
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select GENERIC_CLOCKEVENTS
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select GENERIC_SMP_IDLE_THREAD
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select GENERIC_STRNCPY_FROM_USER
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select GENERIC_STRNLEN_USER
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@ -66,21 +66,7 @@ do_entInt(unsigned long type, unsigned long vector,
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break;
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case 1:
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old_regs = set_irq_regs(regs);
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#ifdef CONFIG_SMP
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{
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long cpu;
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smp_percpu_timer_interrupt(regs);
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cpu = smp_processor_id();
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if (cpu != boot_cpuid) {
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kstat_incr_irqs_this_cpu(RTC_IRQ, irq_to_desc(RTC_IRQ));
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} else {
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handle_irq(RTC_IRQ);
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}
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}
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#else
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handle_irq(RTC_IRQ);
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#endif
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set_irq_regs(old_regs);
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return;
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case 2:
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@ -135,13 +135,13 @@ extern void unregister_srm_console(void);
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/* smp.c */
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extern void setup_smp(void);
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extern void handle_ipi(struct pt_regs *);
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extern void smp_percpu_timer_interrupt(struct pt_regs *);
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/* bios32.c */
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/* extern void reset_for_srm(void); */
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/* time.c */
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extern irqreturn_t timer_interrupt(int irq, void *dev);
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extern void init_clockevent(void);
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extern void common_init_rtc(void);
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extern unsigned long est_cycle_freq;
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@ -138,9 +138,11 @@ smp_callin(void)
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/* Get our local ticker going. */
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smp_setup_percpu_timer(cpuid);
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init_clockevent();
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/* Call platform-specific callin, if specified */
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if (alpha_mv.smp_callin) alpha_mv.smp_callin();
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if (alpha_mv.smp_callin)
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alpha_mv.smp_callin();
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/* All kernel threads share the same mm context. */
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atomic_inc(&init_mm.mm_count);
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@ -498,35 +500,6 @@ smp_cpus_done(unsigned int max_cpus)
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((bogosum + 2500) / (5000/HZ)) % 100);
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}
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void
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smp_percpu_timer_interrupt(struct pt_regs *regs)
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{
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struct pt_regs *old_regs;
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int cpu = smp_processor_id();
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unsigned long user = user_mode(regs);
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struct cpuinfo_alpha *data = &cpu_data[cpu];
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old_regs = set_irq_regs(regs);
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/* Record kernel PC. */
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profile_tick(CPU_PROFILING);
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if (!--data->prof_counter) {
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/* We need to make like a normal interrupt -- otherwise
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timer interrupts ignore the global interrupt lock,
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which would be a Bad Thing. */
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irq_enter();
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update_process_times(user);
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data->prof_counter = data->prof_multiplier;
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irq_exit();
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}
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set_irq_regs(old_regs);
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}
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int
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setup_profiling_timer(unsigned int multiplier)
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{
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@ -42,6 +42,7 @@
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#include <linux/time.h>
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#include <linux/timex.h>
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#include <linux/clocksource.h>
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#include <linux/clockchips.h>
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#include "proto.h"
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#include "irq_impl.h"
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@ -49,25 +50,6 @@
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DEFINE_SPINLOCK(rtc_lock);
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EXPORT_SYMBOL(rtc_lock);
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#define TICK_SIZE (tick_nsec / 1000)
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/*
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* Shift amount by which scaled_ticks_per_cycle is scaled. Shifting
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* by 48 gives us 16 bits for HZ while keeping the accuracy good even
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* for large CPU clock rates.
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*/
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#define FIX_SHIFT 48
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/* lump static variables together for more efficient access: */
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static struct {
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/* cycle counter last time it got invoked */
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__u32 last_time;
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/* ticks/cycle * 2^48 */
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unsigned long scaled_ticks_per_cycle;
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/* partial unused tick */
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unsigned long partial_tick;
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} state;
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unsigned long est_cycle_freq;
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#ifdef CONFIG_IRQ_WORK
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@ -96,49 +78,64 @@ static inline __u32 rpcc(void)
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return __builtin_alpha_rpcc();
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}
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/*
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* timer_interrupt() needs to keep up the real-time clock,
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* as well as call the "xtime_update()" routine every clocktick
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* The RTC as a clock_event_device primitive.
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*/
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irqreturn_t timer_interrupt(int irq, void *dev)
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static DEFINE_PER_CPU(struct clock_event_device, cpu_ce);
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irqreturn_t
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timer_interrupt(int irq, void *dev)
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{
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unsigned long delta;
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__u32 now;
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long nticks;
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int cpu = smp_processor_id();
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struct clock_event_device *ce = &per_cpu(cpu_ce, cpu);
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#ifndef CONFIG_SMP
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/* Not SMP, do kernel PC profiling here. */
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profile_tick(CPU_PROFILING);
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#endif
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/*
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* Calculate how many ticks have passed since the last update,
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* including any previous partial leftover. Save any resulting
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* fraction for the next pass.
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*/
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now = rpcc();
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delta = now - state.last_time;
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state.last_time = now;
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delta = delta * state.scaled_ticks_per_cycle + state.partial_tick;
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state.partial_tick = delta & ((1UL << FIX_SHIFT) - 1);
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nticks = delta >> FIX_SHIFT;
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if (nticks)
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xtime_update(nticks);
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/* Don't run the hook for UNUSED or SHUTDOWN. */
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if (likely(ce->mode == CLOCK_EVT_MODE_PERIODIC))
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ce->event_handler(ce);
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if (test_irq_work_pending()) {
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clear_irq_work_pending();
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irq_work_run();
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}
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#ifndef CONFIG_SMP
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while (nticks--)
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update_process_times(user_mode(get_irq_regs()));
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#endif
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return IRQ_HANDLED;
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}
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static void
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rtc_ce_set_mode(enum clock_event_mode mode, struct clock_event_device *ce)
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{
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/* The mode member of CE is updated in generic code.
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Since we only support periodic events, nothing to do. */
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}
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static int
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rtc_ce_set_next_event(unsigned long evt, struct clock_event_device *ce)
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{
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/* This hook is for oneshot mode, which we don't support. */
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return -EINVAL;
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}
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void __init
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init_clockevent(void)
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{
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int cpu = smp_processor_id();
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struct clock_event_device *ce = &per_cpu(cpu_ce, cpu);
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*ce = (struct clock_event_device){
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.name = "rtc",
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.features = CLOCK_EVT_FEAT_PERIODIC,
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.rating = 100,
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.cpumask = cpumask_of(cpu),
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.set_mode = rtc_ce_set_mode,
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.set_next_event = rtc_ce_set_next_event,
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};
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clockevents_config_and_register(ce, CONFIG_HZ, 0, 0);
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}
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void __init
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common_init_rtc(void)
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{
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@ -372,22 +369,9 @@ time_init(void)
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clocksource_register_hz(&clocksource_rpcc, cycle_freq);
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#endif
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/* From John Bowman <bowman@math.ualberta.ca>: allow the values
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to settle, as the Update-In-Progress bit going low isn't good
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enough on some hardware. 2ms is our guess; we haven't found
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bogomips yet, but this is close on a 500Mhz box. */
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__delay(1000000);
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if (HZ > (1<<16)) {
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extern void __you_loose (void);
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__you_loose();
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}
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state.last_time = cc1;
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state.scaled_ticks_per_cycle
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= ((unsigned long) HZ << FIX_SHIFT) / cycle_freq;
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state.partial_tick = 0L;
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/* Startup the timer source. */
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alpha_mv.init_rtc();
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/* Start up the clock event device. */
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init_clockevent();
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}
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