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// SPDX-License-Identifier: GPL-2.0
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include "linux/perf_event.h"
#include "tests.h"
#include "debug.h"
#include "pmu.h"
#include "pmus.h"
#include "header.h"
#include "../perf-sys.h"
/* hw: cycles,instructions sw: context-switch, uncore: [arch dependent] */
static int types[] = {0, 1, -1};
static unsigned long configs[] = {0, 3, 0};
static unsigned long configs_hw[] = {1};
#define NR_UNCORE_PMUS 5
/* Uncore pmus that support more than 3 counters */
static struct uncore_pmus {
const char *name;
__u64 config;
} uncore_pmus[NR_UNCORE_PMUS] = {
{ "amd_l3", 0x0 },
{ "amd_df", 0x0 },
{ "uncore_imc_0", 0x1 }, /* Intel */
{ "core_imc", 0x318 }, /* PowerPC: core_imc/CPM_STCX_FIN/ */
{ "hv_24x7", 0x22000000003 }, /* PowerPC: hv_24x7/CPM_STCX_FIN/ */
};
static int event_open(int type, unsigned long config, int group_fd)
{
struct perf_event_attr attr;
memset(&attr, 0, sizeof(struct perf_event_attr));
attr.type = type;
attr.size = sizeof(struct perf_event_attr);
attr.config = config;
/*
* When creating an event group, typically the group leader is
* initialized with disabled set to 1 and any child events are
* initialized with disabled set to 0. Despite disabled being 0,
* the child events will not start until the group leader is
* enabled.
*/
attr.disabled = group_fd == -1 ? 1 : 0;
return sys_perf_event_open(&attr, -1, 0, group_fd, 0);
}
static int setup_uncore_event(void)
{
struct perf_pmu *pmu = NULL;
int i, fd;
while ((pmu = perf_pmus__scan(pmu)) != NULL) {
for (i = 0; i < NR_UNCORE_PMUS; i++) {
if (!strcmp(uncore_pmus[i].name, pmu->name)) {
pr_debug("Using %s for uncore pmu event\n", pmu->name);
types[2] = pmu->type;
configs[2] = uncore_pmus[i].config;
/*
* Check if the chosen uncore pmu event can be
* used in the test. For example, incase of accessing
* hv_24x7 pmu counters, partition should have
* additional permissions. If not, event open will
* fail. So check if the event open succeeds
* before proceeding.
*/
fd = event_open(types[2], configs[2], -1);
if (fd < 0)
return -1;
close(fd);
return 0;
}
}
}
return -1;
}
static int run_test(int i, int j, int k)
{
int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5);
int group_fd, sibling_fd1, sibling_fd2;
group_fd = event_open(types[i], configs[i], -1);
if (group_fd == -1)
return -1;
sibling_fd1 = event_open(types[j], configs[j], group_fd);
if (sibling_fd1 == -1) {
close(group_fd);
return erroneous ? 0 : -1;
}
/*
* if all three events (leader and two sibling events)
* are hardware events, use instructions as one of the
* sibling event. There is event constraint in powerpc that
* events using same counter cannot be programmed in a group.
* Since PERF_COUNT_HW_INSTRUCTIONS is a generic hardware
* event and present in all platforms, lets use that.
*/
if (!i && !j && !k)
sibling_fd2 = event_open(types[k], configs_hw[k], group_fd);
else
sibling_fd2 = event_open(types[k], configs[k], group_fd);
if (sibling_fd2 == -1) {
close(sibling_fd1);
close(group_fd);
return erroneous ? 0 : -1;
}
close(sibling_fd2);
close(sibling_fd1);
close(group_fd);
return erroneous ? -1 : 0;
}
static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused)
{
int i, j, k;
int ret;
int r;
ret = setup_uncore_event();
if (ret || types[2] == -1)
return TEST_SKIP;
ret = TEST_OK;
for (i = 0; i < 3; i++) {
for (j = 0; j < 3; j++) {
for (k = 0; k < 3; k++) {
r = run_test(i, j, k);
if (r)
ret = TEST_FAIL;
/*
* For all three events as HW events, second sibling
* event is picked from configs_hw. So print accordingly
*/
if (!i && !j && !k)
pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
types[i], configs[i], types[j], configs[j],
types[k], configs_hw[k], r ? "Fail" : "Pass");
else
pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",
types[i], configs[i], types[j], configs[j],
types[k], configs[k], r ? "Fail" : "Pass");
}
}
}
return ret;
}
DEFINE_SUITE("Event groups", event_groups);
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