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