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_GLOBAL(__setup_cpu_e500v1) _GLOBAL(__setup_cpu_e500v2) mflr r4 bl __e500_icache_setup bl __e500_dcache_setup bl __setup_e500_ivors mtlr r4 blr
/* Adjust or setup IVORs for e500v1/v2 */ _GLOBAL(__setup_e500_ivors) li r3,DebugCrit@l mtspr SPRN_IVOR15,r3 li r3,SPEUnavailable@l mtspr SPRN_IVOR32,r3 li r3,SPEFloatingPointData@l mtspr SPRN_IVOR33,r3 li r3,SPEFloatingPointRound@l mtspr SPRN_IVOR34,r3 li r3,PerformanceMonitor@l mtspr SPRN_IVOR35,r3 sync blr
/* Performance Monitor */ EXCEPTION(0x2060, PerformanceMonitor, performance_monitor_exception, EXC_XFER_STD)
void performance_monitor_exception(struct pt_regs *regs) { perf_irq(regs); }
int reserve_pmc_hardware(perf_irq_t new_perf_irq)
static void op_handle_interrupt(struct pt_regs *regs) { model->handle_interrupt(regs, ctr); }初期化処理で、ハンドルを奪う。
static int op_powerpc_setup(void) { /* Grab the hardware */ err = reserve_pmc_hardware(op_handle_interrupt);driver登録時点で、以下の初期化が行われている。
int __init oprofile_arch_init(struct oprofile_operations *ops) case PPC_OPROFILE_FSL_EMB: model = &op_model_fsl_emb;
static void fsl_emb_handle_interrupt(struct pt_regs *regs, struct op_counter_config *ctr)oprofile_add_ext_sample()でイベント登録。
static inline void __oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs, unsigned long event, int is_kernel) { struct oprofile_cpu_buffer *cpu_buf = &__get_cpu_var(op_cpu_buffer); unsigned long backtrace = oprofile_backtrace_depth; /* * if log_sample() fail we can't backtrace since we lost the * source of this event */ if (!log_sample(cpu_buf, pc, backtrace, is_kernel, event)) /* failed */ return; if (!backtrace) return; oprofile_begin_trace(cpu_buf); oprofile_ops.backtrace(regs, backtrace); oprofile_end_trace(cpu_buf); } void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs, unsigned long event, int is_kernel) { __oprofile_add_ext_sample(pc, regs, event, is_kernel); }
static const char *softirq_names [] = { [HI_SOFTIRQ] = "high", [SCHED_SOFTIRQ] = "sched", [TIMER_SOFTIRQ] = "timer", [NET_TX_SOFTIRQ] = "net-tx", [NET_RX_SOFTIRQ] = "net-rx", [BLOCK_SOFTIRQ] = "block", [BLOCK_IOPOLL_SOFTIRQ]= "block-iopoll", [TASKLET_SOFTIRQ] = "tasklet", [HRTIMER_SOFTIRQ] = "hrtimer", [RCU_SOFTIRQ] = "rcu", }; static struct notifier_block __cpuinitdata cpu_nfb = { .notifier_call = cpu_callback }; static __init int spawn_ksoftirqd(void) { void *cpu = (void *)(long)smp_processor_id(); int err = cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu); BUG_ON(err == NOTIFY_BAD); cpu_callback(&cpu_nfb, CPU_ONLINE, cpu); register_cpu_notifier(&cpu_nfb); return 0; } early_initcall(spawn_ksoftirqd);展開すると以下イメージで処理される。
cpu_callback(&cpu_nfb, CPU_UP_PREPARE, cpu); for (i = 0; i < NR_SOFTIRQS; i++) { per_cpu(ksoftirqd, hotcpu)[i].nr = i; per_cpu(ksoftirqd, hotcpu)[i].cpu = hotcpu; per_cpu(ksoftirqd, hotcpu)[i].tsk = NULL; } for (i = 0; i < NR_SOFTIRQS; i++) { p = kthread_create(run_ksoftirqd, &per_cpu(ksoftirqd, hotcpu)[i], "sirq-%s/%d", softirq_names[i], hotcpu); if (IS_ERR(p)) { printk("ksoftirqd %d for %i failed\n", i, hotcpu); return NOTIFY_BAD; } kthread_bind(p, hotcpu); per_cpu(ksoftirqd, hotcpu)[i].tsk = p; } cpu_callback(&cpu_nfb, CPU_ONLINE, cpu); for (i = 0; i < NR_SOFTIRQS; i++) { param.sched_priority = MAX_RT_PRIO-1; p = per_cpu(ksoftirqd, hotcpu)[i].tsk; sched_setscheduler(p, SCHED_FIFO, ¶m); per_cpu(ksoftirqd, hotcpu)[i].tsk = NULL; kthread_stop(p); } takeover_tasklets(hotcpu);