/*
 *  (C) 2003  Bruno Ducrot
 *  (C) 2004  Dominik Brodowski <linux@dominikbrodowski.de>
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 *
 * Based on code found in
 * linux/include/asm-i386/ist.h and linux/arch/i386/kernel/setup.c
 * and originally developed by Andy Grover <andrew.grover@intel.com>
 */

#include <stdio.h>
#include <string.h>
#include <lrmi.h>

int main (void)
{
	struct LRMI_regs	r;
	int			retval;

	if (!LRMI_init())
		return 0;

	memset(&r, 0, sizeof(r));

	r.eax = 0x0000E980;
	r.edx = 0x47534943;

	retval = LRMI_int(0x15, &r);

	if (!retval) {
		printf("Failed!\n");
		return 0;
	}
	if (r.eax == 0x47534943) {
		printf("BIOS supports GSIC call:\n");
		printf("\tsignature: %c%c%c%c\n",
		       (r.eax >> 24) & 0xff,
		       (r.eax >> 16) & 0xff,
		       (r.eax >> 8) & 0xff,
		       (r.eax) & 0xff);
		printf("\tcommand port = 0x%.4x\n",
		       r.ebx & 0xffff);
		printf("\tcommand =      0x%.4x\n",
		       (r.ebx >> 16) & 0xffff);
		printf("\tevent port =   0x%.8x\n", r.ecx);
		printf("\tflags =        0x%.8x\n", r.edx);
		if (((r.ebx >> 16) & 0xffff) != 0x82) {
			printf("non-default command value. If speedstep-smi "
			       "doesn't work out of the box,\nyou may want to "
			       "try out the default value by passing "
			       "smi_cmd=0x82 to the module\n ON YOUR OWN "
			       "RISK.\n");
		}
		if ((r.ebx & 0xffff) != 0xb2) {
			printf("non-default command port. If speedstep-smi "
			       "doesn't work out of the box,\nyou may want to "
			       "try out the default value by passing "
			       "smi_port=0x82 to the module\n ON YOUR OWN "
			       "RISK.\n");
		}
	} else {
		printf("BIOS DOES NOT support GSIC call.  Dumping registers anyway:\n");
		printf("eax = 0x%.8x\n", r.eax);
		printf("ebx = 0x%.8x\n", r.ebx);
		printf("ecx = 0x%.8x\n", r.ecx);
		printf("edx = 0x%.8x\n", r.edx);
		printf("Note also that some BIOS do not support the initial "
		       "GSIC call, but the newer\nspeedstep-smi driver may "
		       "work.\nFor this, you need to pass some arguments to "
		       "the speedstep-smi driver:\n");
		printf("\tsmi_cmd=0x?? smi_port=0x?? smi_sig=1\n");
		printf("\nUnfortunately, you have to know what exactly are "
		       "smi_cmd and smi_port, and this\nis system "
		       "dependant.\n");
	}
	return 1;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>perf</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>pmu-events</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/arch?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>arch</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/arch/x86?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>x86</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/arch/x86/sandybridge?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>sandybridge</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='07cd12945551b63ecb1a349d50a6d69d1d6feb4a'/><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>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-26 16:47:28 -0500</td></tr>
<tr><th>committer</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-26 16:47:28 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/arch/x86/sandybridge?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>07cd12945551b63ecb1a349d50a6d69d1d6feb4a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/pmu-events/arch/x86/sandybridge?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>75f65eba7eac9277971082a2d5a4cf1370562c0c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/pmu-events/arch/x86/sandybridge?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>tools/perf/pmu-events/arch/x86/sandybridge</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/arch/x86/sandybridge?id=7ce7d89f48834cefece7804d38fc5d85382edf77'>7ce7d89f48834cefece7804d38fc5d85382edf77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/pmu-events/arch/x86/sandybridge?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a&amp;id2=7ce7d89f48834cefece7804d38fc5d85382edf77'>diff</a>)</td></tr></table>
<div class='commit-subject'>cgroup: don't online subsystems before cgroup_name/path() are operational</div><div class='commit-msg'>While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out
cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems
before the new cgroup is associated with it kernfs_node.  This is fine
for cgroup proper but cgroup_name/path() depend on the associated
kernfs_node and if a subsystem makes the new cgroup_subsys_state
visible, which they're allowed to after onlining, it can lead to NULL
dereference.

The current code performs cgroup creation and subsystem onlining in
cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems
visible afterwards.  There's no reason to online the subsystems early
and we can simply drop cgroup_apply_control_enable() call from
cgroup_create() so that the subsystems are onlined and made visible at
the same time.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Reported-by: Konstantin Khlebnikov &lt;khlebnikov@yandex-team.ru&gt;
Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") 
Cc: stable@vger.kernel.org # v4.6+
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>Diffstat</a> (limited to 'tools/perf/pmu-events/arch/x86/sandybridge')</div><table summary='diffstat' class='diffstat'>