137 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <string.h>3#include <unistd.h>4#include <stdio.h>5#include "linux/perf_event.h"6#include "tests.h"7#include "debug.h"8#include "pmu.h"9#include "pmus.h"10#include "header.h"11#include "../perf-sys.h"12 13/* hw: cycles, sw: context-switch, uncore: [arch dependent] */14static int types[] = {0, 1, -1};15static unsigned long configs[] = {0, 3, 0};16 17#define NR_UNCORE_PMUS 518 19/* Uncore pmus that support more than 3 counters */20static struct uncore_pmus {21 const char *name;22 __u64 config;23} uncore_pmus[NR_UNCORE_PMUS] = {24 { "amd_l3", 0x0 },25 { "amd_df", 0x0 },26 { "uncore_imc_0", 0x1 }, /* Intel */27 { "core_imc", 0x318 }, /* PowerPC: core_imc/CPM_STCX_FIN/ */28 { "hv_24x7", 0x22000000003 }, /* PowerPC: hv_24x7/CPM_STCX_FIN/ */29};30 31static int event_open(int type, unsigned long config, int group_fd)32{33 struct perf_event_attr attr;34 35 memset(&attr, 0, sizeof(struct perf_event_attr));36 attr.type = type;37 attr.size = sizeof(struct perf_event_attr);38 attr.config = config;39 /*40 * When creating an event group, typically the group leader is41 * initialized with disabled set to 1 and any child events are42 * initialized with disabled set to 0. Despite disabled being 0,43 * the child events will not start until the group leader is44 * enabled.45 */46 attr.disabled = group_fd == -1 ? 1 : 0;47 48 return sys_perf_event_open(&attr, -1, 0, group_fd, 0);49}50 51static int setup_uncore_event(void)52{53 struct perf_pmu *pmu = NULL;54 int i, fd;55 56 while ((pmu = perf_pmus__scan(pmu)) != NULL) {57 for (i = 0; i < NR_UNCORE_PMUS; i++) {58 if (!strcmp(uncore_pmus[i].name, pmu->name)) {59 pr_debug("Using %s for uncore pmu event\n", pmu->name);60 types[2] = pmu->type;61 configs[2] = uncore_pmus[i].config;62 /*63 * Check if the chosen uncore pmu event can be64 * used in the test. For example, incase of accessing65 * hv_24x7 pmu counters, partition should have66 * additional permissions. If not, event open will67 * fail. So check if the event open succeeds68 * before proceeding.69 */70 fd = event_open(types[2], configs[2], -1);71 if (fd < 0)72 return -1;73 close(fd);74 return 0;75 }76 }77 }78 return -1;79}80 81static int run_test(int i, int j, int k)82{83 int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5);84 int group_fd, sibling_fd1, sibling_fd2;85 86 group_fd = event_open(types[i], configs[i], -1);87 if (group_fd == -1)88 return -1;89 90 sibling_fd1 = event_open(types[j], configs[j], group_fd);91 if (sibling_fd1 == -1) {92 close(group_fd);93 return erroneous ? 0 : -1;94 }95 96 sibling_fd2 = event_open(types[k], configs[k], group_fd);97 if (sibling_fd2 == -1) {98 close(sibling_fd1);99 close(group_fd);100 return erroneous ? 0 : -1;101 }102 103 close(sibling_fd2);104 close(sibling_fd1);105 close(group_fd);106 return erroneous ? -1 : 0;107}108 109static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused)110{111 int i, j, k;112 int ret;113 int r;114 115 ret = setup_uncore_event();116 if (ret || types[2] == -1)117 return TEST_SKIP;118 119 ret = TEST_OK;120 for (i = 0; i < 3; i++) {121 for (j = 0; j < 3; j++) {122 for (k = 0; k < 3; k++) {123 r = run_test(i, j, k);124 if (r)125 ret = TEST_FAIL;126 127 pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n",128 types[i], configs[i], types[j], configs[j],129 types[k], configs[k], r ? "Fail" : "Pass");130 }131 }132 }133 return ret;134}135 136DEFINE_SUITE("Event groups", event_groups);137