/*
 * IrDA netlink layer, for stack configuration.
 *
 * Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
 *
 * Partly based on the 802.11 nelink implementation
 * (see net/wireless/nl80211.c) which is:
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/socket.h>
#include <linux/irda.h>
#include <linux/gfp.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/irda/irda.h>
#include <net/irda/irlap.h>
#include <net/genetlink.h>



static struct genl_family irda_nl_family;

static struct net_device * ifname_to_netdev(struct net *net, struct genl_info *info)
{
	char * ifname;

	if (!info->attrs[IRDA_NL_ATTR_IFNAME])
		return NULL;

	ifname = nla_data(info->attrs[IRDA_NL_ATTR_IFNAME]);

	pr_debug("%s(): Looking for %s\n", __func__, ifname);

	return dev_get_by_name(net, ifname);
}

static int irda_nl_set_mode(struct sk_buff *skb, struct genl_info *info)
{
	struct net_device * dev;
	struct irlap_cb * irlap;
	u32 mode;

	if (!info->attrs[IRDA_NL_ATTR_MODE])
		return -EINVAL;

	mode = nla_get_u32(info->attrs[IRDA_NL_ATTR_MODE]);

	pr_debug("%s(): Switching to mode: %d\n", __func__, mode);

	dev = ifname_to_netdev(&init_net, info);
	if (!dev)
		return -ENODEV;

	irlap = (struct irlap_cb *)dev->atalk_ptr;
	if (!irlap) {
		dev_put(dev);
		return -ENODEV;
	}

	irlap->mode = mode;

	dev_put(dev);

	return 0;
}

static int irda_nl_get_mode(struct sk_buff *skb, struct genl_info *info)
{
	struct net_device * dev;
	struct irlap_cb * irlap;
	struct sk_buff *msg;
	void *hdr;
	int ret = -ENOBUFS;

	dev = ifname_to_netdev(&init_net, info);
	if (!dev)
		return -ENODEV;

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg) {
		dev_put(dev);
		return -ENOMEM;
	}

	irlap = (struct irlap_cb *)dev->atalk_ptr;
	if (!irlap) {
		ret = -ENODEV;
		goto err_out;
	}

	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
			  &irda_nl_family, 0,  IRDA_NL_CMD_GET_MODE);
	if (hdr == NULL) {
		ret = -EMSGSIZE;
		goto err_out;
	}

	if(nla_put_string(msg, IRDA_NL_ATTR_IFNAME,
			  dev->name))
		goto err_out;

	if(nla_put_u32(msg, IRDA_NL_ATTR_MODE, irlap->mode))
		goto err_out;

	genlmsg_end(msg, hdr);

	return genlmsg_reply(msg, info);

 err_out:
	nlmsg_free(msg);
	dev_put(dev);

	return ret;
}

static const struct nla_policy irda_nl_policy[IRDA_NL_ATTR_MAX + 1] = {
	[IRDA_NL_ATTR_IFNAME] = { .type = NLA_NUL_STRING,
				  .len = IFNAMSIZ-1 },
	[IRDA_NL_ATTR_MODE] = { .type = NLA_U32 },
};

static const struct genl_ops irda_nl_ops[] = {
	{
		.cmd = IRDA_NL_CMD_SET_MODE,
		.doit = irda_nl_set_mode,
		.policy = irda_nl_policy,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = IRDA_NL_CMD_GET_MODE,
		.doit = irda_nl_get_mode,
		.policy = irda_nl_policy,
		/* can be retrieved by unprivileged users */
	},

};

static struct genl_family irda_nl_family __ro_after_init = {
	.name = IRDA_NL_NAME,
	.hdrsize = 0,
	.version = IRDA_NL_VERSION,
	.maxattr = IRDA_NL_CMD_MAX,
	.module = THIS_MODULE,
	.ops = irda_nl_ops,
	.n_ops = ARRAY_SIZE(irda_nl_ops),
};

int __init irda_nl_register(void)
{
	return genl_register_family(&irda_nl_family);
}

void irda_nl_unregister(void)
{
	genl_unregister_family(&irda_nl_family);
}
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>Srinivas Pandruvada &lt;srinivas.pandruvada@linux.intel.com&gt;</td><td class='right'>2017-02-03 14:18:39 -0800</td></tr>
<tr><th>committer</th><td>Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;</td><td class='right'>2017-02-04 00:11:08 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/tipc/discover.h?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>6e978b22efa1db9f6e71b24440b5f1d93e968ee3</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/tipc/discover.h?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>c666f7a26b860674848949e39a610222b0723f89</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/tipc/discover.h?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>net/tipc/discover.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/tipc/discover.h?id=3c223c19aea85d3dda1416c187915f4a30b04b1f'>3c223c19aea85d3dda1416c187915f4a30b04b1f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/tipc/discover.h?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3&amp;id2=3c223c19aea85d3dda1416c187915f4a30b04b1f'>diff</a>)</td></tr></table>
<div class='commit-subject'>cpufreq: intel_pstate: Disable energy efficiency optimization</div><div class='commit-msg'>Some Kabylake desktop processors may not reach max turbo when running in
HWP mode, even if running under sustained 100% utilization.

This occurs when the HWP.EPP (Energy Performance Preference) is set to
"balance_power" (0x80) -- the default on most systems.

It occurs because the platform BIOS may erroneously enable an
energy-efficiency setting -- MSR_IA32_POWER_CTL BIT-EE, which is not
recommended to be enabled on this SKU.

On the failing systems, this BIOS issue was not discovered when the
desktop motherboard was tested with Windows, because the BIOS also
neglects to provide the ACPI/CPPC table, that Windows requires to enable
HWP, and so Windows runs in legacy P-state mode, where this setting has
no effect.

Linux' intel_pstate driver does not require ACPI/CPPC to enable HWP, and
so it runs in HWP mode, exposing this incorrect BIOS configuration.

There are several ways to address this problem.

First, Linux can also run in legacy P-state mode on this system.
As intel_pstate is how Linux enables HWP, booting with
"intel_pstate=disable"
will run in acpi-cpufreq/ondemand legacy p-state mode.

Or second, the "performance" governor can be used with intel_pstate,
which will modify HWP.EPP to 0.

Or third, starting in 4.10, the
/sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
attribute in can be updated from "balance_power" to "performance".

Or fourth, apply this patch, which fixes the erroneous setting of
MSR_IA32_POWER_CTL BIT_EE on this model, allowing the default
configuration to function as designed.

Signed-off-by: Srinivas Pandruvada &lt;srinivas.pandruvada@linux.intel.com&gt;
Reviewed-by: Len Brown &lt;len.brown@intel.com&gt;
Cc: 4.6+ &lt;stable@vger.kernel.org&gt; # 4.6+
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=6e978b22efa1db9f6e71b24440b5f1d93e968ee3'>Diffstat</a> (limited to 'net/tipc/discover.h')</div><table summary='diffstat' class='diffstat'>