db8c1ee9d0
The Cycle CouNTer on ARM cannot be used reliably as it wraps around rather quickly and can be altered by user space (on Minix). Furthermore, it's buggy when wrapping and is not implemented at all on the Linaro Beagleboard emulator. This patch programs GPTIMER10 as a free running clock at 1.625 MHz (it doesn't generate interrupts). It's memory mapped into every process, which enables libsys to provide micro_delay(). Change-Id: Iba004c6c62976762fe154ea390d69e518eec1531
143 lines
2.6 KiB
C
143 lines
2.6 KiB
C
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/* ARM-specific clock functions. */
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#include "kernel/kernel.h"
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#include "kernel/clock.h"
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#include "kernel/proc.h"
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#include "kernel/interrupt.h"
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#include <minix/u64.h>
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#include "kernel/glo.h"
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#include "kernel/profile.h"
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#include "kernel/spinlock.h"
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#ifdef CONFIG_SMP
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#include "kernel/smp.h"
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#endif
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#include "omap_timer.h"
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#include "omap_intr.h"
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static unsigned tsc_per_ms[CONFIG_MAX_CPUS];
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int init_local_timer(unsigned freq)
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{
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omap3_timer_init(freq);
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omap3_frclock_init();
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/* always only 1 cpu in the system */
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tsc_per_ms[0] = 1;
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return 0;
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}
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void stop_local_timer(void)
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{
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omap3_timer_stop();
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}
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void arch_timer_int_handler(void)
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{
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omap3_timer_int_handler();
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}
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void cycles_accounting_init(void)
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{
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read_tsc_64(get_cpu_var_ptr(cpu, tsc_ctr_switch));
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make_zero64(get_cpu_var(cpu, cpu_last_tsc));
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make_zero64(get_cpu_var(cpu, cpu_last_idle));
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}
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void context_stop(struct proc * p)
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{
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u64_t tsc, tsc_delta;
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u64_t * __tsc_ctr_switch = get_cpulocal_var_ptr(tsc_ctr_switch);
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read_tsc_64(&tsc);
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p->p_cycles = add64(p->p_cycles, sub64(tsc, *__tsc_ctr_switch));
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tsc_delta = sub64(tsc, *__tsc_ctr_switch);
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if(kbill_ipc) {
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kbill_ipc->p_kipc_cycles =
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add64(kbill_ipc->p_kipc_cycles, tsc_delta);
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kbill_ipc = NULL;
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}
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if(kbill_kcall) {
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kbill_kcall->p_kcall_cycles =
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add64(kbill_kcall->p_kcall_cycles, tsc_delta);
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kbill_kcall = NULL;
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}
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/*
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* deduct the just consumed cpu cycles from the cpu time left for this
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* process during its current quantum. Skip IDLE and other pseudo kernel
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* tasks
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*/
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if (p->p_endpoint >= 0) {
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#if DEBUG_RACE
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make_zero64(p->p_cpu_time_left);
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#else
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/* if (tsc_delta < p->p_cpu_time_left) in 64bit */
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if (ex64hi(tsc_delta) < ex64hi(p->p_cpu_time_left) ||
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(ex64hi(tsc_delta) == ex64hi(p->p_cpu_time_left) &&
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ex64lo(tsc_delta) < ex64lo(p->p_cpu_time_left)))
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{
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p->p_cpu_time_left = sub64(p->p_cpu_time_left, tsc_delta);
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}
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else {
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make_zero64(p->p_cpu_time_left);
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}
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#endif
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}
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*__tsc_ctr_switch = tsc;
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}
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void context_stop_idle(void)
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{
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int is_idle;
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#ifdef CONFIG_SMP
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unsigned cpu = cpuid;
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#endif
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is_idle = get_cpu_var(cpu, cpu_is_idle);
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get_cpu_var(cpu, cpu_is_idle) = 0;
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context_stop(get_cpulocal_var_ptr(idle_proc));
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if (is_idle)
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restart_local_timer();
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#if SPROFILE
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if (sprofiling)
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get_cpulocal_var(idle_interrupted) = 1;
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#endif
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}
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void restart_local_timer(void)
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{
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}
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int register_local_timer_handler(const irq_handler_t handler)
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{
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return omap3_register_timer_handler(handler);
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}
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u64_t ms_2_cpu_time(unsigned ms)
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{
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return mul64u(tsc_per_ms[cpuid], ms);
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}
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unsigned cpu_time_2_ms(u64_t cpu_time)
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{
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return div64u(cpu_time, tsc_per_ms[cpuid]);
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}
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short cpu_load(void)
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{
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return 0;
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}
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