/* $Id: misc.c,v 1.20.2.1 2005/12/22 22:44:49 mikpe Exp $

 * Miscellaneous perfctr operations.

 *

 * Copyright (C) 1999-2004  Mikael Pettersson

 */

#include <errno.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <stddef.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include "libperfctr.h"

#include "marshal.h"

#include "arch.h"

int _perfctr_abi_check_fd(int fd, unsigned int user_abi_version)

{

    unsigned int driver_abi_version;

    if( ioctl(fd, PERFCTR_ABI, &driver_abi_version) < 0 ) {

	perror("perfctr_abi_check");

	return -1;

    }

    if( (driver_abi_version ^ user_abi_version) & 0xFF00FF00 ) {

	fprintf(stderr, "Error: perfctr ABI major version mismatch: "

		"driver ABI 0x%08X, user ABI 0x%08X\n",

		driver_abi_version, user_abi_version);

	errno = EPROTO;

	return -1;

    }

    return 0;

}

int perfctr_info(int fd, struct perfctr_info *info)

{

    int err = perfctr_ioctl_r(fd, PERFCTR_INFO, info, &perfctr_info_sdesc);

    if( err < 0 )

	return err;

    perfctr_info_cpu_init(info);

    return 0;

}

int perfctr_get_info(struct perfctr_info *info)

{

    int fd, ret;

    fd = open("/dev/perfctr", O_RDONLY);

    if (fd < 0)

	return -1;

    ret = perfctr_info(fd, info);

    close(fd);

    return ret;

}

struct perfctr_cpus_info *perfctr_cpus_info(int fd)

{

    struct perfctr_cpu_mask dummy;

    struct perfctr_cpus_info *info;

    unsigned int cpu_mask_bytes;

    dummy.nrwords = 0;

    if( ioctl(fd, PERFCTR_CPUS, &dummy) >= 0 ||

	errno != EOVERFLOW ||

	dummy.nrwords == 0 ) {

	perror("PERFCTR_CPUS");

	return NULL;

    }

    cpu_mask_bytes = offsetof(struct perfctr_cpu_mask, mask[dummy.nrwords]);

    info = malloc(sizeof(struct perfctr_cpus_info) + 2*cpu_mask_bytes);

    if( !info ) {

	perror("malloc");

	return NULL;

    }

    info->cpus = (struct perfctr_cpu_mask*)(info + 1);

    info->cpus->nrwords = dummy.nrwords;

    info->cpus_forbidden = (struct perfctr_cpu_mask*)((char*)(info + 1) + cpu_mask_bytes);

    info->cpus_forbidden->nrwords = dummy.nrwords;

    if( ioctl(fd, PERFCTR_CPUS, info->cpus) < 0 ||

	ioctl(fd, PERFCTR_CPUS_FORBIDDEN, info->cpus_forbidden) < 0 ) {

	perror("PERFCTR_CPUS");

	free(info);

	return NULL;

    }

    return info;

}

void perfctr_info_print(const struct perfctr_info *info)

{

    static const char * const features[] = { "rdpmc", "rdtsc", "pcint" };

    int fi, comma;

    printf("abi_version\t\t0x%08X\n", info->abi_version);

    printf("driver_version\t\t%s\n", info->driver_version);

    printf("cpu_type\t\t%u (%s)\n", info->cpu_type, perfctr_info_cpu_name(info));

    printf("cpu_features\t\t%#x (", info->cpu_features);

    for(comma = 0, fi = 0; fi < sizeof features / sizeof features[0]; ++fi) {

	unsigned fmask = 1 << fi;

	if( info->cpu_features & fmask ) {

	    if( comma )

		printf(",");

	    printf("%s", features[fi]);

	    comma = 1;

	}

    }

    printf(")\n");

    printf("cpu_khz\t\t\t%u\n", info->cpu_khz);

    printf("tsc_to_cpu_mult\t\t%u%s\n",

	   info->tsc_to_cpu_mult,

	   info->tsc_to_cpu_mult ? "" : " (unspecified, assume 1)");

    printf("cpu_nrctrs\t\t%u\n", perfctr_info_nrctrs(info));

}

static void print_cpus(const struct perfctr_cpu_mask *cpus)

{

    unsigned int nrcpus, nr, i, cpumask, bitmask;

    printf("[");

    nrcpus = 0;

    for(i = 0; i < cpus->nrwords; ++i) {

	cpumask = cpus->mask[i];

	nr = i * 8 * sizeof(int);

	for(bitmask = 1; cpumask != 0; ++nr, bitmask <<= 1) {

	    if( cpumask & bitmask ) {

		cpumask &= ~bitmask;

		if( nrcpus )

		    printf(",");

		++nrcpus;

		printf("%u", nr);

	    }

	}

    }

    printf("], total: %u\n", nrcpus);

}

void perfctr_cpus_info_print(const struct perfctr_cpus_info *info)

{

    printf("cpus\t\t\t"); print_cpus(info->cpus);

    printf("cpus_forbidden\t\t"); print_cpus(info->cpus_forbidden);

}