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Get TSC frequency from CPUID 0x15 and/or x16 for newer Intel processors.

 - If the max CPUID leaf is >= 0x15, take TSC value from CPUID. Some processors
   can take TSC/core crystal clock ratio but core crystal clock frequency
   can't be taken. Intel SDM give us the values for some processors.
 - It also required to change lapic_per_second to make LAPIC timer correctly.
 - Add new file x86/x86/identcpu_subr.c to share common subroutines between
   kernel and userland. Some code in x86/x86/identcpu.c and cpuctl/arch/i386.c
   will be moved to this file in future.
 - Add comment to clarify.

/*	$NetBSD: cpuctl.c,v 1.31 2020/04/21 02:56:37 msaitoh Exp $	*/

/*-
 * Copyright (c) 2007, 2008, 2009, 2012, 2015 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Doran.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef lint
#include <sys/cdefs.h>
__RCSID("$NetBSD: cpuctl.c,v 1.31 2020/04/21 02:56:37 msaitoh Exp $");
#endif /* not lint */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/cpuio.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include <time.h>
#include <sched.h>
#include <stdbool.h>

#include "cpuctl.h"

static u_int	getcpuid(char *);
__dead static void	usage(void);

static void	cpu_identify(char **);
static void	cpu_list(char **);
static void	cpu_offline(char **);
static void	cpu_online(char **);
static void	cpu_intr(char **);
static void	cpu_nointr(char **);
static void	cpu_ucode(char **);

static struct cmdtab {
	const char	*label;
	bool	takesargs;
	bool	argsoptional;
	void	(*func)(char **);
} const cpu_cmdtab[] = {
	{ "identify",	true,  false, cpu_identify },
	{ "list",	false, false, cpu_list },
	{ "offline",	true,  false, cpu_offline },
	{ "online",	true,  false, cpu_online },
	{ "intr",	true,  false, cpu_intr },
	{ "nointr",	true,  false, cpu_nointr },
	{ "ucode",	true,  true,  cpu_ucode },
	{ NULL,		false, false, NULL },
};

static int	fd;
int		verbose;

int
main(int argc, char **argv)
{
	const struct cmdtab *ct;
	int ch;

	while ((ch = getopt(argc, argv, "v")) != -1)
		switch (ch) {
		case 'v':
			verbose = 1;
			break;
		default:
			usage();
		}
	argc -= optind;
	argv += optind;
	if (argc < 1)
		usage();

	if ((fd = open(_PATH_CPUCTL, O_RDWR)) < 0)
		err(EXIT_FAILURE, _PATH_CPUCTL);

	for (ct = cpu_cmdtab; ct->label != NULL; ct++) {
		if (strcmp(argv[0], ct->label) == 0) {
			if (!ct->argsoptional &&
			    ((ct->takesargs == 0) ^ (argv[1] == NULL)))
			{
				usage();
			}
			(*ct->func)(argv + 1);
			break;
		}
	}

	if (ct->label == NULL)
		errx(EXIT_FAILURE, "unknown command ``%s''", argv[0]);

	close(fd);
	exit(EXIT_SUCCESS);
	/* NOTREACHED */
}

static void
usage(void)
{
	const char *progname = getprogname();

	fprintf(stderr, "usage: %s identify cpuno\n", progname);
	fprintf(stderr, "       %s list\n", progname);
	fprintf(stderr, "       %s offline cpuno\n", progname);
	fprintf(stderr, "       %s online cpuno\n", progname);
	fprintf(stderr, "       %s intr cpuno\n", progname);
	fprintf(stderr, "       %s nointr cpuno\n", progname);
	fprintf(stderr, "       %s ucode [cpuno] [file]\n", progname);
	exit(EXIT_FAILURE);
	/* NOTREACHED */
}

static void
cpu_online(char **argv)
{
	cpustate_t cs;

	for (; *argv; argv++) {
		cs.cs_id = getcpuid(*argv);
		if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_GETSTATE");
		cs.cs_online = true;
		if (ioctl(fd, IOC_CPU_SETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_SETSTATE");
	}
}

static void
cpu_offline(char **argv)
{
	cpustate_t cs;

	for (; *argv; argv++) {
		cs.cs_id = getcpuid(*argv);
		if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_GETSTATE");
		cs.cs_online = false;
		if (ioctl(fd, IOC_CPU_SETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_SETSTATE");
	}
}

static void
cpu_intr(char **argv)
{
	cpustate_t cs;

	for (; *argv; argv++) {
		cs.cs_id = getcpuid(*argv);
		if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_GETSTATE");
		cs.cs_intr = true;
		if (ioctl(fd, IOC_CPU_SETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_SETSTATE");
	}
}

static void
cpu_nointr(char **argv)
{
	cpustate_t cs;

	for (; *argv; argv++) {
		cs.cs_id = getcpuid(*argv);
		if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_GETSTATE");
		cs.cs_intr = false;
		if (ioctl(fd, IOC_CPU_SETSTATE, &cs) < 0) {
			if (errno == EOPNOTSUPP) {
				warnx("interrupt control not supported on "
				    "this platform");
			} else
				err(EXIT_FAILURE, "IOC_CPU_SETSTATE");
		}
	}
}

static void
cpu_ucode(char **argv)
{
	int error;
	struct cpu_ucode uc;
	unsigned long id = 0; /* gcc */
	char *ep;
	cpuset_t *cpuset;

	uc.cpu_nr = -1;
	if (argv[0] != NULL) {
		id = strtoul(argv[0], &ep, 0);
		if (id != ULONG_MAX && *ep == '\0') {
			uc.cpu_nr = id;
			argv++;
		}
	}
	if (argv[0] != NULL)
		strlcpy(uc.fwname, argv[0], sizeof(uc.fwname));
	else
		memset(uc.fwname, '\0', sizeof(uc.fwname));

	error = ucodeupdate_check(fd, &uc);
	if (error)
		errx(EXIT_FAILURE, "unsupported");

	if (uc.cpu_nr == CPU_UCODE_CURRENT_CPU) {
		cpuset = cpuset_create();
		if (cpuset == NULL)
			err(EXIT_FAILURE, "cpuset_create");
		cpuset_zero(cpuset);
		if (cpuset_set(id, cpuset) < 0)
			err(EXIT_FAILURE, "cpuset_set");
		if (_sched_setaffinity(0, 0, cpuset_size(cpuset), cpuset) < 0) {
			err(EXIT_FAILURE, "_sched_setaffinity");
		}
		cpuset_destroy(cpuset);
	}
	error = ioctl(fd, IOC_CPU_UCODE_APPLY, &uc);
	if (error < 0) {
		if (uc.fwname[0])
			err(EXIT_FAILURE, "%s", uc.fwname);
		else
			err(EXIT_FAILURE, "IOC_CPU_UCODE_APPLY");
	}
}

static void
cpu_identify(char **argv)
{
	char name[32];
	unsigned int id, np;
	cpuset_t *cpuset;

	np = sysconf(_SC_NPROCESSORS_CONF);
	for (; *argv; argv++) {
		id = getcpuid(*argv);
		snprintf(name, sizeof(name), "cpu%u", id);

		if (identifycpu_bind() && np != 1) {
			cpuset = cpuset_create();
			if (cpuset == NULL)
				err(EXIT_FAILURE, "cpuset_create");
			cpuset_zero(cpuset);
			if (cpuset_set(id, cpuset) < 0)
				err(EXIT_FAILURE, "cpuset_set");
			if (_sched_setaffinity(0, 0, cpuset_size(cpuset), cpuset) < 0) {
				if (errno == EPERM) {
					printf("Cannot bind to target CPU.  Output "
					    "may not accurately describe the target.\n"
					    "Run as root to allow binding.\n\n");
				} else { 
					err(EXIT_FAILURE, "_sched_setaffinity");
				}
			}
			cpuset_destroy(cpuset);
		}
		identifycpu(fd, name);
	}
}

static u_int
getcpuid(char *arg)
{
	char *argp;
	u_int id;
	long np;

	id = (u_int)strtoul(arg, &argp, 0);
	if (*argp != '\0')
		usage();

	np = sysconf(_SC_NPROCESSORS_CONF);
	if (id >= (u_long)np)
		errx(EXIT_FAILURE, "Invalid CPU number");

	return id;
}

static void
cpu_list(char **argv)
{
	const char *state, *intr;
	cpustate_t cs;
	u_int cnt, i;
	time_t lastmod;
	char ibuf[16], *ts;
	
	if (ioctl(fd, IOC_CPU_GETCOUNT, &cnt) < 0)
		err(EXIT_FAILURE, "IOC_CPU_GETCOUNT");

	printf(
"Num  HwId Unbound LWPs Interrupts Last change              #Intr\n"
"---- ---- ------------ ---------- ------------------------ -----\n");

	for (i = 0; i < cnt; i++) {
		cs.cs_id = i;
		if (ioctl(fd, IOC_CPU_GETSTATE, &cs) < 0)
			err(EXIT_FAILURE, "IOC_CPU_GETSTATE");
		if (ioctl(fd, IOC_CPU_MAPID, &cs.cs_id) < 0)
			err(EXIT_FAILURE, "IOC_CPU_MAPID");
		if (cs.cs_online)
			state = "online";
		else
			state = "offline";
		if (cs.cs_intr)
			intr = "intr";
		else
			intr = "nointr";
		if (cs.cs_intrcnt == 0)
			strcpy(ibuf, "?");
		else
			snprintf(ibuf, sizeof(ibuf), "%d", cs.cs_intrcnt - 1);

		lastmod = (time_t)cs.cs_lastmod |
		    ((time_t)cs.cs_lastmodhi << 32);
		ts = asctime(localtime(&lastmod));
		ts[strlen(ts) - 1] = '\0';
		printf("%-4d %-4x %-12s %-10s %s %-5s\n",
		   i, cs.cs_hwid, state,
		   intr, ts, ibuf);
	}
}

int
aprint_normal(const char *fmt, ...)
{
	va_list ap;
	int rv;

	va_start(ap, fmt);
	rv = vfprintf(stdout, fmt, ap);
	va_end(ap);

	return rv;
}
__strong_alias(aprint_verbose,aprint_normal)
__strong_alias(aprint_error,aprint_normal)

int
aprint_normal_dev(const char *dev, const char *fmt, ...)
{
	va_list ap;
	int rv;

	printf("%s: ", dev);
	va_start(ap, fmt);
	rv = vfprintf(stdout, fmt, ap);
	va_end(ap);

	return rv;
}
__strong_alias(aprint_verbose_dev,aprint_normal_dev)
__strong_alias(aprint_error_dev,aprint_normal_dev)
__strong_alias(aprint_debug_dev,aprint_normal_dev)