/*
 * Copyright 2012  Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/irqflags.h>
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/atomic.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/ftrace.h>
#include <linux/fs.h>
#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/cache.h>
#include <asm/barrier.h>
#include "internal.h"

/* This doesn't need to be atomic: speed is chosen over correctness here. */
static u64 pstore_ftrace_stamp;

static void notrace pstore_ftrace_call(unsigned long ip,
				       unsigned long parent_ip,
				       struct ftrace_ops *op,
				       struct pt_regs *regs)
{
	unsigned long flags;
	struct pstore_ftrace_record rec = {};

	if (unlikely(oops_in_progress))
		return;

	local_irq_save(flags);

	rec.ip = ip;
	rec.parent_ip = parent_ip;
	pstore_ftrace_write_timestamp(&rec, pstore_ftrace_stamp++);
	pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());
	psinfo->write_buf(PSTORE_TYPE_FTRACE, 0, NULL, 0, (void *)&rec,
			  0, sizeof(rec), psinfo);

	local_irq_restore(flags);
}

static struct ftrace_ops pstore_ftrace_ops __read_mostly = {
	.func	= pstore_ftrace_call,
};

static DEFINE_MUTEX(pstore_ftrace_lock);
static bool pstore_ftrace_enabled;

static ssize_t pstore_ftrace_knob_write(struct file *f, const char __user *buf,
					size_t count, loff_t *ppos)
{
	u8 on;
	ssize_t ret;

	ret = kstrtou8_from_user(buf, count, 2, &on);
	if (ret)
		return ret;

	mutex_lock(&pstore_ftrace_lock);

	if (!on ^ pstore_ftrace_enabled)
		goto out;

	if (on) {
		ftrace_ops_set_global_filter(&pstore_ftrace_ops);
		ret = register_ftrace_function(&pstore_ftrace_ops);
	} else {
		ret = unregister_ftrace_function(&pstore_ftrace_ops);
	}

	if (ret) {
		pr_err("%s: unable to %sregister ftrace ops: %zd\n",
		       __func__, on ? "" : "un", ret);
		goto err;
	}

	pstore_ftrace_enabled = on;
out:
	ret = count;
err:
	mutex_unlock(&pstore_ftrace_lock);

	return ret;
}

static ssize_t pstore_ftrace_knob_read(struct file *f, char __user *buf,
				       size_t count, loff_t *ppos)
{
	char val[] = { '0' + pstore_ftrace_enabled, '\n' };

	return simple_read_from_buffer(buf, count, ppos, val, sizeof(val));
}

static const struct file_operations pstore_knob_fops = {
	.open	= simple_open,
	.read	= pstore_ftrace_knob_read,
	.write	= pstore_ftrace_knob_write,
};

static struct dentry *pstore_ftrace_dir;

void pstore_register_ftrace(void)
{
	struct dentry *file;

	if (!psinfo->write_buf)
		return;

	pstore_ftrace_dir = debugfs_create_dir("pstore", NULL);
	if (!pstore_ftrace_dir) {
		pr_err("%s: unable to create pstore directory\n", __func__);
		return;
	}

	file = debugfs_create_file("record_ftrace", 0600, pstore_ftrace_dir,
				   NULL, &pstore_knob_fops);
	if (!file) {
		pr_err("%s: unable to create record_ftrace file\n", __func__);
		goto err_file;
	}

	return;
err_file:
	debugfs_remove(pstore_ftrace_dir);
}

void pstore_unregister_ftrace(void)
{
	mutex_lock(&pstore_ftrace_lock);
	if (pstore_ftrace_enabled) {
		unregister_ftrace_function(&pstore_ftrace_ops);
		pstore_ftrace_enabled = 0;
	}
	mutex_unlock(&pstore_ftrace_lock);

	debugfs_remove_recursive(pstore_ftrace_dir);
}
ontext' 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'>2017-01-27 12:54:16 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-27 12:54:16 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/perf-bench.txt?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>1b1bc42c1692e9b62756323c675a44cb1a1f9dbd</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/Documentation/perf-bench.txt?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>d514a2d8512fc52c15747841e2368f8f99a50787</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/Documentation/perf-bench.txt?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>tools/perf/Documentation/perf-bench.txt</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/perf-bench.txt?id=3365135d43f861003555c963b309672d053a2228'>3365135d43f861003555c963b309672d053a2228</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/Documentation/perf-bench.txt?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd&amp;id2=3365135d43f861003555c963b309672d053a2228'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/perf-bench.txt?id=950eabbd6ddedc1b08350b9169a6a51b130ebaaf'>950eabbd6ddedc1b08350b9169a6a51b130ebaaf</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/Documentation/perf-bench.txt?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd&amp;id2=950eabbd6ddedc1b08350b9169a6a51b130ebaaf'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net</div><div class='commit-msg'>Pull networking fixes from David Miller:

 1) GTP fixes from Andreas Schultz (missing genl module alias, clear IP
    DF on transmit).

 2) Netfilter needs to reflect the fwmark when sending resets, from Pau
    Espin Pedrol.

 3) nftable dump OOPS fix from Liping Zhang.

 4) Fix erroneous setting of VIRTIO_NET_HDR_F_DATA_VALID on transmit,
    from Rolf Neugebauer.

 5) Fix build error of ipt_CLUSTERIP when procfs is disabled, from Arnd
    Bergmann.

 6) Fix regression in handling of NETIF_F_SG in harmonize_features(),
    from Eric Dumazet.

 7) Fix RTNL deadlock wrt. lwtunnel module loading, from David Ahern.

 8) tcp_fastopen_create_child() needs to setup tp-&gt;max_window, from
    Alexey Kodanev.

 9) Missing kmemdup() failure check in ipv6 segment routing code, from
    Eric Dumazet.

10) Don't execute unix_bind() under the bindlock, otherwise we deadlock
    with splice. From WANG Cong.

11) ip6_tnl_parse_tlv_enc_lim() potentially reallocates the skb buffer,
    therefore callers must reload cached header pointers into that skb.
    Fix from Eric Dumazet.

12) Fix various bugs in legacy IRQ fallback handling in alx driver, from
    Tobias Regnery.

13) Do not allow lwtunnel drivers to be unloaded while they are
    referenced by active instances, from Robert Shearman.

14) Fix truncated PHY LED trigger names, from Geert Uytterhoeven.

15) Fix a few regressions from virtio_net XDP support, from John
    Fastabend and Jakub Kicinski.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (102 commits)
  ISDN: eicon: silence misleading array-bounds warning
  net: phy: micrel: add support for KSZ8795
  gtp: fix cross netns recv on gtp socket
  gtp: clear DF bit on GTP packet tx
  gtp: add genl family modules alias
  tcp: don't annotate mark on control socket from tcp_v6_send_response()
  ravb: unmap descriptors when freeing rings
  virtio_net: reject XDP programs using header adjustment
  virtio_net: use dev_kfree_skb for small buffer XDP receive
  r8152: check rx after napi is enabled
  r8152: re-schedule napi for tx
  r8152: avoid start_xmit to schedule napi when napi is disabled
  r8152: avoid start_xmit to call napi_schedule during autosuspend
  net: dsa: Bring back device detaching in dsa_slave_suspend()
  net: phy: leds: Fix truncated LED trigger names
  net: phy: leds: Break dependency of phy.h on phy_led_triggers.h
  net: phy: leds: Clear phy_num_led_triggers on failure to avoid crash
  net-next: ethernet: mediatek: change the compatible string
  Documentation: devicetree: change the mediatek ethernet compatible string
  bnxt_en: Fix RTNL lock usage on bnxt_get_port_module_status().
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1b1bc42c1692e9b62756323c675a44cb1a1f9dbd'>Diffstat</a> (limited to 'tools/perf/Documentation/perf-bench.txt')</div><table summary='diffstat' class='diffstat'>