/*
 *  (C) 2003 - 2004  Dominik Brodowski <linux@dominikbrodowski.de>
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 *
 * Based on code found in
 * linux/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
 * and originally developed by Jeremy Fitzhardinge.
 *
 * USAGE: simply run it to decode the current settings on CPU 0,
 *	  or pass the CPU number as argument, or pass the MSR content
 *	  as argument.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>

#define MCPU	32

#define MSR_IA32_PERF_STATUS	0x198

static int rdmsr(unsigned int cpu, unsigned int msr,
		 unsigned int *lo, unsigned int *hi)
{
	int fd;
	char file[20];
	unsigned long long val;
	int retval = -1;

	*lo = *hi = 0;

	if (cpu > MCPU)
		goto err1;

	sprintf(file, "/dev/cpu/%d/msr", cpu);
	fd = open(file, O_RDONLY);

	if (fd < 0)
		goto err1;

	if (lseek(fd, msr, SEEK_CUR) == -1)
		goto err2;

	if (read(fd, &val, 8) != 8)
		goto err2;

	*lo = (uint32_t )(val & 0xffffffffull);
	*hi = (uint32_t )(val>>32 & 0xffffffffull);

	retval = 0;
err2:
	close(fd);
err1:
	return retval;
}

static void decode (unsigned int msr)
{
	unsigned int multiplier;
	unsigned int mv;

	multiplier = ((msr >> 8) & 0xFF);

	mv = (((msr & 0xFF) * 16) + 700);

	printf("0x%x means multiplier %d @ %d mV\n", msr, multiplier, mv);
}

static int decode_live(unsigned int cpu)
{
	unsigned int lo, hi;
	int err;

	err = rdmsr(cpu, MSR_IA32_PERF_STATUS, &lo, &hi);

	if (err) {
		printf("can't get MSR_IA32_PERF_STATUS for cpu %d\n", cpu);
		printf("Possible trouble: you don't run an Enhanced SpeedStep capable cpu\n");
		printf("or you are not root, or the msr driver is not present\n");
		return 1;
	}

	decode(lo);

	return 0;
}

int main (int argc, char **argv)
{
	unsigned int cpu, mode = 0;

	if (argc < 2)
		cpu = 0;
	else {
		cpu = strtoul(argv[1], NULL, 0);
		if (cpu >= MCPU)
			mode = 1;
	}

	if (mode)
		decode(cpu);
	else
		decode_live(cpu);

	return 0;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/mon?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>mon</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/mon/mon_bin.c?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>mon_bin.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='ca92e6c7e6329029d7188487a5c32e86ef471977'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-18 11:13:41 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-18 11:13:41 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/mon/mon_bin.c?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>ca92e6c7e6329029d7188487a5c32e86ef471977</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/mon/mon_bin.c?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>704fb5c2ca533cdb569826522eed0dbbcf31f316</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/mon/mon_bin.c?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>drivers/usb/mon/mon_bin.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/mon/mon_bin.c?id=0b75f821ec8be459dd4dec77be39595d989d77ac'>0b75f821ec8be459dd4dec77be39595d989d77ac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/mon/mon_bin.c?id=ca92e6c7e6329029d7188487a5c32e86ef471977&amp;id2=0b75f821ec8be459dd4dec77be39595d989d77ac'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/mon/mon_bin.c?id=4205e4786d0b9fc3b4fec7b1910cf645a0468307'>4205e4786d0b9fc3b4fec7b1910cf645a0468307</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/mon/mon_bin.c?id=ca92e6c7e6329029d7188487a5c32e86ef471977&amp;id2=4205e4786d0b9fc3b4fec7b1910cf645a0468307'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</div><div class='commit-msg'>Pull SMP hotplug update from Thomas Gleixner:
 "This contains a trivial typo fix and an extension to the core code for
  dynamically allocating states in the prepare stage.

  The extension is necessary right now because we need a proper way to
  unbreak LTTNG, which iscurrently non functional due to the removal of
  the notifiers. Surely it's out of tree, but it's widely used by
  distros.

  The simple solution would have been to reserve a state for LTTNG, but
  I'm not fond about unused crap in the kernel and the dynamic range,
  which we admittedly should have done right away, allows us to remove
  quite some of the hardcoded states, i.e. those which have no ordering
  requirements. So doing the right thing now is better than having an
  smaller intermediate solution which needs to be reworked anyway"

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Provide dynamic range for prepare stage
  perf/x86/amd/ibs: Fix typo after cleanup state names in cpu/hotplug
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>Diffstat</a> (limited to 'drivers/usb/mon/mon_bin.c')</div><table summary='diffstat' class='diffstat'>