#include "tests/tests.h"
#include "perf.h"
#include "cloexec.h"
#include "debug.h"
#include "evlist.h"
#include "evsel.h"
#include "arch-tests.h"

#include <sys/mman.h>
#include <string.h>

static pid_t spawn(void)
{
	pid_t pid;

	pid = fork();
	if (pid)
		return pid;

	while(1)
		sleep(5);
	return 0;
}

/*
 * Create an event group that contains both a sampled hardware
 * (cpu-cycles) and software (intel_cqm/llc_occupancy/) event. We then
 * wait for the hardware perf counter to overflow and generate a PMI,
 * which triggers an event read for both of the events in the group.
 *
 * Since reading Intel CQM event counters requires sending SMP IPIs, the
 * CQM pmu needs to handle the above situation gracefully, and return
 * the last read counter value to avoid triggering a WARN_ON_ONCE() in
 * smp_call_function_many() caused by sending IPIs from NMI context.
 */
int test__intel_cqm_count_nmi_context(int subtest __maybe_unused)
{
	struct perf_evlist *evlist = NULL;
	struct perf_evsel *evsel = NULL;
	struct perf_event_attr pe;
	int i, fd[2], flag, ret;
	size_t mmap_len;
	void *event;
	pid_t pid;
	int err = TEST_FAIL;

	flag = perf_event_open_cloexec_flag();

	evlist = perf_evlist__new();
	if (!evlist) {
		pr_debug("perf_evlist__new failed\n");
		return TEST_FAIL;
	}

	ret = parse_events(evlist, "intel_cqm/llc_occupancy/", NULL);
	if (ret) {
		pr_debug("parse_events failed, is \"intel_cqm/llc_occupancy/\" available?\n");
		err = TEST_SKIP;
		goto out;
	}

	evsel = perf_evlist__first(evlist);
	if (!evsel) {
		pr_debug("perf_evlist__first failed\n");
		goto out;
	}

	memset(&pe, 0, sizeof(pe));
	pe.size = sizeof(pe);

	pe.type = PERF_TYPE_HARDWARE;
	pe.config = PERF_COUNT_HW_CPU_CYCLES;
	pe.read_format = PERF_FORMAT_GROUP;

	pe.sample_period = 128;
	pe.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_READ;

	pid = spawn();

	fd[0] = sys_perf_event_open(&pe, pid, -1, -1, flag);
	if (fd[0] < 0) {
		pr_debug("failed to open event\n");
		goto out;
	}

	memset(&pe, 0, sizeof(pe));
	pe.size = sizeof(pe);

	pe.type = evsel->attr.type;
	pe.config = evsel->attr.config;

	fd[1] = sys_perf_event_open(&pe, pid, -1, fd[0], flag);
	if (fd[1] < 0) {
		pr_debug("failed to open event\n");
		goto out;
	}

	/*
	 * Pick a power-of-two number of pages + 1 for the meta-data
	 * page (struct perf_event_mmap_page). See tools/perf/design.txt.
	 */
	mmap_len = page_size * 65;

	event = mmap(NULL, mmap_len, PROT_READ, MAP_SHARED, fd[0], 0);
	if (event == (void *)(-1)) {
		pr_debug("failed to mmap %d\n", errno);
		goto out;
	}

	sleep(1);

	err = TEST_OK;

	munmap(event, mmap_len);

	for (i = 0; i < 2; i++)
		close(fd[i]);

	kill(pid, SIGKILL);
	wait(NULL);
out:
	perf_evlist__delete(evlist);
	return err;
}
a45df6ffd9e891114125dc919f18b96b'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>atm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='f7d6040aa45df6ffd9e891114125dc919f18b96b'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-06 15:11:04 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-06 15:11:04 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>f7d6040aa45df6ffd9e891114125dc919f18b96b</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/atm?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>b20fed8e63bf327d6521923851a96ba080c48ce5</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/atm?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>drivers/usb/atm</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=50dcb6cdb70281d76b28d1564f8e076bb08f2c60'>50dcb6cdb70281d76b28d1564f8e076bb08f2c60</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/atm?id=f7d6040aa45df6ffd9e891114125dc919f18b96b&amp;id2=50dcb6cdb70281d76b28d1564f8e076bb08f2c60'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=cbf304e420da96992eae50bb6d51035681340ab8'>cbf304e420da96992eae50bb6d51035681340ab8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/atm?id=f7d6040aa45df6ffd9e891114125dc919f18b96b&amp;id2=cbf304e420da96992eae50bb6d51035681340ab8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'pm-4.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm</div><div class='commit-msg'>Pull power management fixes from Rafael Wysocki:
 "These add a quirk to intel_pstate to work around a firmware setting
  that leads to frequency scaling issues (discovered recently) on some
  Intel Kaby Lake processors, fix up the recently added brcmstb-avs
  cpufreq driver and avoid false-positive warnings from the runtime PM
  framework triggered by recent changes in i915.

  Specifics:

   - Add an intel_pstate driver quirk to work around a firmware setting
     that leads to frequency scaling issues on desktop Intel Kaby Lake
     processors in some configurations if the hardware-managed P-states
     (HWP) feature is in use (Srinivas Pandruvada)

   - Fix up the recently added brcmstb-avs cpufreq driver: fix a bug
     related to system suspend and change the sysfs interface to match
     the user space expectations (Markus Mayer)

   - Modify the runtime PM framework to avoid false-positive warnings
     from the might_sleep_if() assertions in it (Rafael Wysocki)"

* tag 'pm-4.10-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / runtime: Avoid false-positive warnings from might_sleep_if()
  cpufreq: intel_pstate: Disable energy efficiency optimization
  cpufreq: brcmstb-avs-cpufreq: properly retrieve P-state upon suspend
  cpufreq: brcmstb-avs-cpufreq: extend sysfs entry brcm_avs_pmap
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=f7d6040aa45df6ffd9e891114125dc919f18b96b'>Diffstat</a> (limited to 'drivers/usb/atm')</div><table summary='diffstat' class='diffstat'>