/*
 * Copyright (C) 2007 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License v.2.
 */

#include <net/genetlink.h>
#include <linux/dlm.h>
#include <linux/dlm_netlink.h>
#include <linux/gfp.h>

#include "dlm_internal.h"

static uint32_t dlm_nl_seqnum;
static uint32_t listener_nlportid;

static struct genl_family family;

static int prepare_data(u8 cmd, struct sk_buff **skbp, size_t size)
{
	struct sk_buff *skb;
	void *data;

	skb = genlmsg_new(size, GFP_NOFS);
	if (!skb)
		return -ENOMEM;

	/* add the message headers */
	data = genlmsg_put(skb, 0, dlm_nl_seqnum++, &family, 0, cmd);
	if (!data) {
		nlmsg_free(skb);
		return -EINVAL;
	}

	*skbp = skb;
	return 0;
}

static struct dlm_lock_data *mk_data(struct sk_buff *skb)
{
	struct nlattr *ret;

	ret = nla_reserve(skb, DLM_TYPE_LOCK, sizeof(struct dlm_lock_data));
	if (!ret)
		return NULL;
	return nla_data(ret);
}

static int send_data(struct sk_buff *skb)
{
	struct genlmsghdr *genlhdr = nlmsg_data((struct nlmsghdr *)skb->data);
	void *data = genlmsg_data(genlhdr);

	genlmsg_end(skb, data);

	return genlmsg_unicast(&init_net, skb, listener_nlportid);
}

static int user_cmd(struct sk_buff *skb, struct genl_info *info)
{
	listener_nlportid = info->snd_portid;
	printk("user_cmd nlpid %u\n", listener_nlportid);
	return 0;
}

static const struct genl_ops dlm_nl_ops[] = {
	{
		.cmd	= DLM_CMD_HELLO,
		.doit	= user_cmd,
	},
};

static struct genl_family family __ro_after_init = {
	.name		= DLM_GENL_NAME,
	.version	= DLM_GENL_VERSION,
	.ops		= dlm_nl_ops,
	.n_ops		= ARRAY_SIZE(dlm_nl_ops),
	.module		= THIS_MODULE,
};

int __init dlm_netlink_init(void)
{
	return genl_register_family(&family);
}

void dlm_netlink_exit(void)
{
	genl_unregister_family(&family);
}

static void fill_data(struct dlm_lock_data *data, struct dlm_lkb *lkb)
{
	struct dlm_rsb *r = lkb->lkb_resource;

	memset(data, 0, sizeof(struct dlm_lock_data));

	data->version = DLM_LOCK_DATA_VERSION;
	data->nodeid = lkb->lkb_nodeid;
	data->ownpid = lkb->lkb_ownpid;
	data->id = lkb->lkb_id;
	data->remid = lkb->lkb_remid;
	data->status = lkb->lkb_status;
	data->grmode = lkb->lkb_grmode;
	data->rqmode = lkb->lkb_rqmode;
	if (lkb->lkb_ua)
		data->xid = lkb->lkb_ua->xid;
	if (r) {
		data->lockspace_id = r->res_ls->ls_global_id;
		data->resource_namelen = r->res_length;
		memcpy(data->resource_name, r->res_name, r->res_length);
	}
}

void dlm_timeout_warn(struct dlm_lkb *lkb)
{
	struct sk_buff *uninitialized_var(send_skb);
	struct dlm_lock_data *data;
	size_t size;
	int rv;

	size = nla_total_size(sizeof(struct dlm_lock_data)) +
	       nla_total_size(0); /* why this? */

	rv = prepare_data(DLM_CMD_TIMEOUT, &send_skb, size);
	if (rv < 0)
		return;

	data = mk_data(send_skb);
	if (!data) {
		nlmsg_free(send_skb);
		return;
	}

	fill_data(data, lkb);

	send_data(send_skb);
}

mmit/drivers/usb?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/c67x00?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>c67x00</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/c67x00/c67x00.h?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>c67x00.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'/><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>Benjamin Herrenschmidt &lt;benh@kernel.crashing.org&gt;</td><td class='right'>2017-02-03 17:10:28 +1100</td></tr>
<tr><th>committer</th><td>Michael Ellerman &lt;mpe@ellerman.id.au&gt;</td><td class='right'>2017-02-08 23:36:29 +1100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/c67x00/c67x00.h?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>d7df2443cd5f67fc6ee7c05a88e4996e8177f91b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/c67x00/c67x00.h?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>098a7c0ca4fceb8a65cb1f693c9d71990388933d</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/c67x00/c67x00.h?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>drivers/usb/c67x00/c67x00.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/c67x00/c67x00.h?id=a0615a16f7d0ceb5804d295203c302d496d8ee91'>a0615a16f7d0ceb5804d295203c302d496d8ee91</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/c67x00/c67x00.h?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b&amp;id2=a0615a16f7d0ceb5804d295203c302d496d8ee91'>diff</a>)</td></tr></table>
<div class='commit-subject'>powerpc/mm: Fix spurrious segfaults on radix with autonuma</div><div class='commit-msg'>When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it
clears all the protection bits but leave the PTE valid.

With the Radix MMU, an attempt at executing from such a PTE will
take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G".

It is thus incorrect to treat all such faults as errors. We should
pass them to handle_mm_fault() for autonuma to deal with. The case
of pages that are really not executable is handled by the existing
test for VM_EXEC further down.

That leaves us with catching the kernel attempts at executing user
pages. We can catch that earlier, even before we do find_vma.

It is never valid on powerpc for the kernel to take an exec fault
to begin with. So fold that test with the existing test for the
kernel faulting on kernel addresses to bail out early.

Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report")
Signed-off-by: Benjamin Herrenschmidt &lt;benh@kernel.crashing.org&gt;
Reviewed-by: Aneesh Kumar K.V &lt;aneesh.kumar@linux.vnet.ibm.com&gt;
Acked-by: Balbir Singh &lt;bsingharora@gmail.com&gt;
Signed-off-by: Michael Ellerman &lt;mpe@ellerman.id.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>Diffstat</a> (limited to 'drivers/usb/c67x00/c67x00.h')</div><table summary='diffstat' class='diffstat'>