Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/**

 * @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

};