/** * @file op_model_ppro.h * pentium pro / P6 model-specific MSR operations * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon * @author Philippe Elie * @author Graydon Hoare */ #include <linux/oprofile.h> #include <asm/ptrace.h> #include <asm/msr.h> #include <asm/apic.h> #include <asm/nmi.h> #include "op_x86_model.h" #include "op_counter.h" #define NUM_COUNTERS 2 #define NUM_CONTROLS 2 #define CTR_IS_RESERVED(msrs,c) (msrs->counters[(c)].addr ? 1 : 0) #define CTR_READ(l,h,msrs,c) do {rdmsr(msrs->counters[(c)].addr, (l), (h));} while (0) #define CTR_32BIT_WRITE(l,msrs,c) \ do {wrmsr(msrs->counters[(c)].addr, -(u32)(l), 0);} while (0) #define CTR_OVERFLOWED(n) (!((n) & (1U<<31))) #define CTRL_IS_RESERVED(msrs,c) (msrs->controls[(c)].addr ? 1 : 0) #define CTRL_READ(l,h,msrs,c) do {rdmsr((msrs->controls[(c)].addr), (l), (h));} while (0) #define CTRL_WRITE(l,h,msrs,c) do {wrmsr((msrs->controls[(c)].addr), (l), (h));} while (0) #define CTRL_SET_ACTIVE(n) (n |= (1<<22)) #define CTRL_SET_INACTIVE(n) (n &= ~(1<<22)) #define CTRL_CLEAR(x) (x &= (1<<21)) #define CTRL_SET_ENABLE(val) (val |= 1<<20) #define CTRL_SET_USR(val,u) (val |= ((u & 1) << 16)) #define CTRL_SET_KERN(val,k) (val |= ((k & 1) << 17)) #define CTRL_SET_UM(val, m) (val |= (m << 8)) #define CTRL_SET_EVENT(val, e) (val |= e) static unsigned long reset_value[NUM_COUNTERS]; static void ppro_fill_in_addresses(struct op_msrs * const msrs) { int i; for (i=0; i < NUM_COUNTERS; i++) { if (reserve_perfctr_nmi(MSR_P6_PERFCTR0 + i)) msrs->counters[i].addr = MSR_P6_PERFCTR0 + i; else msrs->counters[i].addr = 0; } for (i=0; i < NUM_CONTROLS; i++) { if (reserve_evntsel_nmi(MSR_P6_EVNTSEL0 + i)) msrs->controls[i].addr = MSR_P6_EVNTSEL0 + i; else msrs->controls[i].addr = 0; } } static void ppro_setup_ctrs(struct op_msrs const * const msrs) { unsigned int low, high; int i; /* clear all counters */ for (i = 0 ; i < NUM_CONTROLS; ++i) { if (unlikely(!CTRL_IS_RESERVED(msrs,i))) continue; CTRL_READ(low, high, msrs, i); CTRL_CLEAR(low); CTRL_WRITE(low, high, msrs, i); } /* avoid a false detection of ctr overflows in NMI handler */ for (i = 0; i < NUM_COUNTERS; ++i) { if (unlikely(!CTR_IS_RESERVED(msrs,i))) continue; CTR_32BIT_WRITE(1, msrs, i); } /* enable active counters */ for (i = 0; i < NUM_COUNTERS; ++i) { if ((counter_config[i].enabled) && (CTR_IS_RESERVED(msrs,i))) { reset_value[i] = counter_config[i].count; CTR_32BIT_WRITE(counter_config[i].count, msrs, i); CTRL_READ(low, high, msrs, i); CTRL_CLEAR(low); CTRL_SET_ENABLE(low); CTRL_SET_USR(low, counter_config[i].user); CTRL_SET_KERN(low, counter_config[i].kernel); CTRL_SET_UM(low, counter_config[i].unit_mask); CTRL_SET_EVENT(low, counter_config[i].event); CTRL_WRITE(low, high, msrs, i); } else { reset_value[i] = 0; } } } static int ppro_check_ctrs(struct pt_regs * const regs, struct op_msrs const * const msrs) { unsigned int low, high; int i; for (i = 0 ; i < NUM_COUNTERS; ++i) { if (!reset_value[i]) continue; CTR_READ(low, high, msrs, i); if (CTR_OVERFLOWED(low)) { oprofile_add_sample(regs, i); CTR_32BIT_WRITE(reset_value[i], msrs, i); } } /* Only P6 based Pentium M need to re-unmask the apic vector but it * doesn't hurt other P6 variant */ apic_write(APIC_LVTPC, apic_read(APIC_LVTPC) & ~APIC_LVT_MASKED); /* We can't work out if we really handled an interrupt. We * might have caught a *second* counter just after overflowing * the interrupt for this counter then arrives * and we don't find a counter that's overflowed, so we * would return 0 and get dazed + confused. Instead we always * assume we found an overflow. This sucks. */ return 1; } static void ppro_start(struct op_msrs const * const msrs) { unsigned int low,high; int i; for (i = 0; i < NUM_COUNTERS; ++i) { if (reset_value[i]) { CTRL_READ(low, high, msrs, i); CTRL_SET_ACTIVE(low); CTRL_WRITE(low, high, msrs, i); } } } static void ppro_stop(struct op_msrs const * const msrs) { unsigned int low,high; int i; for (i = 0; i < NUM_COUNTERS; ++i) { if (!reset_value[i]) continue; CTRL_READ(low, high, msrs, i); CTRL_SET_INACTIVE(low); CTRL_WRITE(low, high, msrs, i); } } static void ppro_shutdown(struct op_msrs const * const msrs) { int i; for (i = 0 ; i < NUM_COUNTERS ; ++i) { if (CTR_IS_RESERVED(msrs,i)) release_perfctr_nmi(MSR_P6_PERFCTR0 + i); } for (i = 0 ; i < NUM_CONTROLS ; ++i) { if (CTRL_IS_RESERVED(msrs,i)) release_evntsel_nmi(MSR_P6_EVNTSEL0 + i); } } struct op_x86_model_spec const op_ppro_spec = { .num_counters = NUM_COUNTERS, .num_controls = NUM_CONTROLS, .fill_in_addresses = &ppro_fill_in_addresses, .setup_ctrs = &ppro_setup_ctrs, .check_ctrs = &ppro_check_ctrs, .start = &ppro_start, .stop = &ppro_stop, .shutdown = &ppro_shutdown };