/*
 * Copyright (C) 2015 Davidlohr Bueso.
 */

/* For the CLR_() macros */
#include <pthread.h>

#include <signal.h>
#include "../util/stat.h"
#include <subcmd/parse-options.h>
#include <linux/compiler.h>
#include <linux/kernel.h>
#include <errno.h>
#include "bench.h"
#include "futex.h"

#include <err.h>
#include <stdlib.h>
#include <sys/time.h>

struct worker {
	int tid;
	u_int32_t *futex;
	pthread_t thread;
	unsigned long ops;
};

static u_int32_t global_futex = 0;
static struct worker *worker;
static unsigned int nsecs = 10;
static bool silent = false, multi = false;
static bool done = false, fshared = false;
static unsigned int ncpus, nthreads = 0;
static int futex_flag = 0;
struct timeval start, end, runtime;
static pthread_mutex_t thread_lock;
static unsigned int threads_starting;
static struct stats throughput_stats;
static pthread_cond_t thread_parent, thread_worker;

static const struct option options[] = {
	OPT_UINTEGER('t', "threads",  &nthreads, "Specify amount of threads"),
	OPT_UINTEGER('r', "runtime", &nsecs,     "Specify runtime (in seconds)"),
	OPT_BOOLEAN( 'M', "multi",   &multi,     "Use multiple futexes"),
	OPT_BOOLEAN( 's', "silent",  &silent,    "Silent mode: do not display data/details"),
	OPT_BOOLEAN( 'S', "shared",  &fshared,   "Use shared futexes instead of private ones"),
	OPT_END()
};

static const char * const bench_futex_lock_pi_usage[] = {
	"perf bench futex lock-pi <options>",
	NULL
};

static void print_summary(void)
{
	unsigned long avg = avg_stats(&throughput_stats);
	double stddev = stddev_stats(&throughput_stats);

	printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
	       !silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
	       (int) runtime.tv_sec);
}

static void toggle_done(int sig __maybe_unused,
			siginfo_t *info __maybe_unused,
			void *uc __maybe_unused)
{
	/* inform all threads that we're done for the day */
	done = true;
	gettimeofday(&end, NULL);
	timersub(&end, &start, &runtime);
}

static void *workerfn(void *arg)
{
	struct worker *w = (struct worker *) arg;
	unsigned long ops = w->ops;

	pthread_mutex_lock(&thread_lock);
	threads_starting--;
	if (!threads_starting)
		pthread_cond_signal(&thread_parent);
	pthread_cond_wait(&thread_worker, &thread_lock);
	pthread_mutex_unlock(&thread_lock);

	do {
		int ret;
	again:
		ret = futex_lock_pi(w->futex, NULL, futex_flag);

		if (ret) { /* handle lock acquisition */
			if (!silent)
				warn("thread %d: Could not lock pi-lock for %p (%d)",
				     w->tid, w->futex, ret);
			if (done)
				break;

			goto again;
		}

		usleep(1);
		ret = futex_unlock_pi(w->futex, futex_flag);
		if (ret && !silent)
			warn("thread %d: Could not unlock pi-lock for %p (%d)",
			     w->tid, w->futex, ret);
		ops++; /* account for thread's share of work */
	}  while (!done);

	w->ops = ops;
	return NULL;
}

static void create_threads(struct worker *w, pthread_attr_t thread_attr)
{
	cpu_set_t cpu;
	unsigned int i;

	threads_starting = nthreads;

	for (i = 0; i < nthreads; i++) {
		worker[i].tid = i;

		if (multi) {
			worker[i].futex = calloc(1, sizeof(u_int32_t));
			if (!worker[i].futex)
				err(EXIT_FAILURE, "calloc");
		} else
			worker[i].futex = &global_futex;

		CPU_ZERO(&cpu);
		CPU_SET(i % ncpus, &cpu);

		if (pthread_attr_setaffinity_np(&thread_attr, sizeof(cpu_set_t), &cpu))
			err(EXIT_FAILURE, "pthread_attr_setaffinity_np");

		if (pthread_create(&w[i].thread, &thread_attr, workerfn, &worker[i]))
			err(EXIT_FAILURE, "pthread_create");
	}
}

int bench_futex_lock_pi(int argc, const char **argv,
			const char *prefix __maybe_unused)
{
	int ret = 0;
	unsigned int i;
	struct sigaction act;
	pthread_attr_t thread_attr;

	argc = parse_options(argc, argv, options, bench_futex_lock_pi_usage, 0);
	if (argc)
		goto err;

	ncpus = sysconf(_SC_NPROCESSORS_ONLN);
	nsecs = futexbench_sanitize_numeric(nsecs);

	sigfillset(&act.sa_mask);
	act.sa_sigaction = toggle_done;
	sigaction(SIGINT, &act, NULL);

	if (!nthreads)
		nthreads = ncpus;
	else
		nthreads = futexbench_sanitize_numeric(nthreads);

	worker = calloc(nthreads, sizeof(*worker));
	if (!worker)
		err(EXIT_FAILURE, "calloc");

	if (!fshared)
		futex_flag = FUTEX_PRIVATE_FLAG;

	printf("Run summary [PID %d]: %d threads doing pi lock/unlock pairing for %d secs.\n\n",
	       getpid(), nthreads, nsecs);

	init_stats(&throughput_stats);
	pthread_mutex_init(&thread_lock, NULL);
	pthread_cond_init(&thread_parent, NULL);
	pthread_cond_init(&thread_worker, NULL);

	threads_starting = nthreads;
	pthread_attr_init(&thread_attr);
	gettimeofday(&start, NULL);

	create_threads(worker, thread_attr);
	pthread_attr_destroy(&thread_attr);

	pthread_mutex_lock(&thread_lock);
	while (threads_starting)
		pthread_cond_wait(&thread_parent, &thread_lock);
	pthread_cond_broadcast(&thread_worker);
	pthread_mutex_unlock(&thread_lock);

	sleep(nsecs);
	toggle_done(0, NULL, NULL);

	for (i = 0; i < nthreads; i++) {
		ret = pthread_join(worker[i].thread, NULL);
		if (ret)
			err(EXIT_FAILURE, "pthread_join");
	}

	/* cleanup & report results */
	pthread_cond_destroy(&thread_parent);
	pthread_cond_destroy(&thread_worker);
	pthread_mutex_destroy(&thread_lock);

	for (i = 0; i < nthreads; i++) {
		unsigned long t = worker[i].ops/runtime.tv_sec;

		update_stats(&throughput_stats, t);
		if (!silent)
			printf("[thread %3d] futex: %p [ %ld ops/sec ]\n",
			       worker[i].tid, worker[i].futex, t);

		if (multi)
			free(worker[i].futex);
	}

	print_summary();

	free(worker);
	return ret;
err:
	usage_with_options(bench_futex_lock_pi_usage, options);
	exit(EXIT_FAILURE);
}
tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/mon/Kconfig?id=2883aaea363f7a897ff06d2e6c73ae7aae285bcb'>2883aaea363f7a897ff06d2e6c73ae7aae285bcb</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/mon/Kconfig?id=6d04dfc8966019b8b0977b2cb942351f13d2b178&amp;id2=2883aaea363f7a897ff06d2e6c73ae7aae285bcb'>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/Kconfig?id=06425c308b92eaf60767bc71d359f4cbc7a561f8'>06425c308b92eaf60767bc71d359f4cbc7a561f8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/mon/Kconfig?id=6d04dfc8966019b8b0977b2cb942351f13d2b178&amp;id2=06425c308b92eaf60767bc71d359f4cbc7a561f8'>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) Fix handling of interrupt status in stmmac driver. Just because we
    have masked the event from generating interrupts, doesn't mean the
    bit won't still be set in the interrupt status register. From Alexey
    Brodkin.

 2) Fix DMA API debugging splats in gianfar driver, from Arseny Solokha.

 3) Fix off-by-one error in __ip6_append_data(), from Vlad Yasevich.

 4) cls_flow does not match on icmpv6 codes properly, from Simon Horman.

 5) Initial MAC address can be set incorrectly in some scenerios, from
    Ivan Vecera.

 6) Packet header pointer arithmetic fix in ip6_tnl_parse_tlv_end_lim(),
    from Dan Carpenter.

 7) Fix divide by zero in __tcp_select_window(), from Eric Dumazet.

 8) Fix crash in iwlwifi when unregistering thermal zone, from Jens
    Axboe.

 9) Check for DMA mapping errors in starfire driver, from Alexey
    Khoroshilov.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (31 commits)
  tcp: fix 0 divide in __tcp_select_window()
  ipv6: pointer math error in ip6_tnl_parse_tlv_enc_lim()
  net: fix ndo_features_check/ndo_fix_features comment ordering
  net/sched: matchall: Fix configuration race
  be2net: fix initial MAC setting
  ipv6: fix flow labels when the traffic class is non-0
  net: thunderx: avoid dereferencing xcv when NULL
  net/sched: cls_flower: Correct matching on ICMPv6 code
  ipv6: Paritially checksum full MTU frames
  net/mlx4_core: Avoid command timeouts during VF driver device shutdown
  gianfar: synchronize DMA API usage by free_skb_rx_queue w/ gfar_new_page
  net: ethtool: add support for 2500BaseT and 5000BaseT link modes
  can: bcm: fix hrtimer/tasklet termination in bcm op removal
  net: adaptec: starfire: add checks for dma mapping errors
  net: phy: micrel: KSZ8795 do not set SUPPORTED_[Asym_]Pause
  can: Fix kernel panic at security_sock_rcv_skb
  net: macb: Fix 64 bit addressing support for GEM
  stmmac: Discard masked flags in interrupt status register
  net/mlx5e: Check ets capability before ets query FW command
  net/mlx5e: Fix update of hash function/key via ethtool
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=6d04dfc8966019b8b0977b2cb942351f13d2b178'>Diffstat</a> (limited to 'drivers/usb/mon/Kconfig')</div><table summary='diffstat' class='diffstat'>