/*
 * Test backward bit in event attribute, read ring buffer from end to
 * beginning
 */

#include <perf.h>
#include <evlist.h>
#include <sys/prctl.h>
#include "tests.h"
#include "debug.h"

#define NR_ITERS 111

static void testcase(void)
{
	int i;

	for (i = 0; i < NR_ITERS; i++) {
		char proc_name[10];

		snprintf(proc_name, sizeof(proc_name), "p:%d\n", i);
		prctl(PR_SET_NAME, proc_name);
	}
}

static int count_samples(struct perf_evlist *evlist, int *sample_count,
			 int *comm_count)
{
	int i;

	for (i = 0; i < evlist->nr_mmaps; i++) {
		union perf_event *event;

		perf_mmap__read_catchup(&evlist->backward_mmap[i]);
		while ((event = perf_mmap__read_backward(&evlist->backward_mmap[i])) != NULL) {
			const u32 type = event->header.type;

			switch (type) {
			case PERF_RECORD_SAMPLE:
				(*sample_count)++;
				break;
			case PERF_RECORD_COMM:
				(*comm_count)++;
				break;
			default:
				pr_err("Unexpected record of type %d\n", type);
				return TEST_FAIL;
			}
		}
	}
	return TEST_OK;
}

static int do_test(struct perf_evlist *evlist, int mmap_pages,
		   int *sample_count, int *comm_count)
{
	int err;
	char sbuf[STRERR_BUFSIZE];

	err = perf_evlist__mmap(evlist, mmap_pages, true);
	if (err < 0) {
		pr_debug("perf_evlist__mmap: %s\n",
			 str_error_r(errno, sbuf, sizeof(sbuf)));
		return TEST_FAIL;
	}

	perf_evlist__enable(evlist);
	testcase();
	perf_evlist__disable(evlist);

	err = count_samples(evlist, sample_count, comm_count);
	perf_evlist__munmap(evlist);
	return err;
}


int test__backward_ring_buffer(int subtest __maybe_unused)
{
	int ret = TEST_SKIP, err, sample_count = 0, comm_count = 0;
	char pid[16], sbuf[STRERR_BUFSIZE];
	struct perf_evlist *evlist;
	struct perf_evsel *evsel __maybe_unused;
	struct parse_events_error parse_error;
	struct record_opts opts = {
		.target = {
			.uid = UINT_MAX,
			.uses_mmap = true,
		},
		.freq	      = 0,
		.mmap_pages   = 256,
		.default_interval = 1,
	};

	snprintf(pid, sizeof(pid), "%d", getpid());
	pid[sizeof(pid) - 1] = '\0';
	opts.target.tid = opts.target.pid = pid;

	evlist = perf_evlist__new();
	if (!evlist) {
		pr_debug("Not enough memory to create evlist\n");
		return TEST_FAIL;
	}

	err = perf_evlist__create_maps(evlist, &opts.target);
	if (err < 0) {
		pr_debug("Not enough memory to create thread/cpu maps\n");
		goto out_delete_evlist;
	}

	bzero(&parse_error, sizeof(parse_error));
	/*
	 * Set backward bit, ring buffer should be writing from end. Record
	 * it in aux evlist
	 */
	err = parse_events(evlist, "syscalls:sys_enter_prctl/overwrite/", &parse_error);
	if (err) {
		pr_debug("Failed to parse tracepoint event, try use root\n");
		ret = TEST_SKIP;
		goto out_delete_evlist;
	}

	perf_evlist__config(evlist, &opts, NULL);

	err = perf_evlist__open(evlist);
	if (err < 0) {
		pr_debug("perf_evlist__open: %s\n",
			 str_error_r(errno, sbuf, sizeof(sbuf)));
		goto out_delete_evlist;
	}

	ret = TEST_FAIL;
	err = do_test(evlist, opts.mmap_pages, &sample_count,
		      &comm_count);
	if (err != TEST_OK)
		goto out_delete_evlist;

	if ((sample_count != NR_ITERS) || (comm_count != NR_ITERS)) {
		pr_err("Unexpected counter: sample_count=%d, comm_count=%d\n",
		       sample_count, comm_count);
		goto out_delete_evlist;
	}

	err = do_test(evlist, 1, &sample_count, &comm_count);
	if (err != TEST_OK)
		goto out_delete_evlist;

	ret = TEST_OK;
out_delete_evlist:
	perf_evlist__delete(evlist);
	return ret;
}
' 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>Marek Szyprowski &lt;m.szyprowski@samsung.com&gt;</td><td class='right'>2016-11-16 07:04:55 -0200</td></tr>
<tr><th>committer</th><td>Mauro Carvalho Chehab &lt;mchehab@s-opensource.com&gt;</td><td class='right'>2016-11-30 09:20:00 -0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=387e08e2021022e764a235df6c1f0ed3d861f711'>387e08e2021022e764a235df6c1f0ed3d861f711</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=387e08e2021022e764a235df6c1f0ed3d861f711'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=387e08e2021022e764a235df6c1f0ed3d861f711'>3fab8d8b8b2b82dfa85d9135b80b861019c20367</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=7e55a016fac080118a634179405c821c31d8bd2e'>7e55a016fac080118a634179405c821c31d8bd2e</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=387e08e2021022e764a235df6c1f0ed3d861f711&amp;id2=7e55a016fac080118a634179405c821c31d8bd2e'>diff</a>)</td></tr></table>
<div class='commit-subject'>[media] s5p-mfc: Kill all IS_ERR_OR_NULL in clocks management code</div><div class='commit-msg'>After commit "s5p-mfc: Fix clock management in s5p_mfc_release function"
all clocks related functions are called only when MFC device is really
available, so there is no additional check needed for NULL
gate clocks. This patch simplifies the code and kills IS_ERR_OR_NULL
macro usage.

Signed-off-by: Marek Szyprowski &lt;m.szyprowski@samsung.com&gt;
Signed-off-by: Sylwester Nawrocki &lt;s.nawrocki@samsung.com&gt;
Signed-off-by: Mauro Carvalho Chehab &lt;mchehab@s-opensource.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=387e08e2021022e764a235df6c1f0ed3d861f711'>Diffstat</a></div><table summary='diffstat' class='diffstat'>