1 // SPDX-License-Identifier: GPL-2.0 2 #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,instructions sw: context-switch, uncore: [arch dependent] */ 14 static int types[] = {0, 1, -1}; 15 static unsigned long configs[] = {0, 3, 0}; 16 static unsigned long configs_hw[] = {1}; 17 18 #define NR_UNCORE_PMUS 5 19 20 /* Uncore pmus that support more than 3 counters */ 21 static struct uncore_pmus { 22 const char *name; 23 __u64 config; 24 } uncore_pmus[NR_UNCORE_PMUS] = { 25 { "amd_l3", 0x0 }, 26 { "amd_df", 0x0 }, 27 { "uncore_imc_0", 0x1 }, /* Intel */ 28 { "core_imc", 0x318 }, /* PowerPC: core_imc/CPM_STCX_FIN/ */ 29 { "hv_24x7", 0x22000000003 }, /* PowerPC: hv_24x7/CPM_STCX_FIN/ */ 30 }; 31 32 static int event_open(int type, unsigned long config, int group_fd) 33 { 34 struct perf_event_attr attr; 35 36 memset(&attr, 0, sizeof(struct perf_event_attr)); 37 attr.type = type; 38 attr.size = sizeof(struct perf_event_attr); 39 attr.config = config; 40 /* 41 * When creating an event group, typically the group leader is 42 * initialized with disabled set to 1 and any child events are 43 * initialized with disabled set to 0. Despite disabled being 0, 44 * the child events will not start until the group leader is 45 * enabled. 46 */ 47 attr.disabled = group_fd == -1 ? 1 : 0; 48 49 return sys_perf_event_open(&attr, -1, 0, group_fd, 0); 50 } 51 52 static int setup_uncore_event(void) 53 { 54 struct perf_pmu *pmu = NULL; 55 int i, fd; 56 57 while ((pmu = perf_pmus__scan(pmu)) != NULL) { 58 for (i = 0; i < NR_UNCORE_PMUS; i++) { 59 if (!strcmp(uncore_pmus[i].name, pmu->name)) { 60 pr_debug("Using %s for uncore pmu event\n", pmu->name); 61 types[2] = pmu->type; 62 configs[2] = uncore_pmus[i].config; 63 /* 64 * Check if the chosen uncore pmu event can be 65 * used in the test. For example, incase of accessing 66 * hv_24x7 pmu counters, partition should have 67 * additional permissions. If not, event open will 68 * fail. So check if the event open succeeds 69 * before proceeding. 70 */ 71 fd = event_open(types[2], configs[2], -1); 72 if (fd < 0) 73 return -1; 74 close(fd); 75 return 0; 76 } 77 } 78 } 79 return -1; 80 } 81 82 static int run_test(int i, int j, int k) 83 { 84 int erroneous = ((((1 << i) | (1 << j) | (1 << k)) & 5) == 5); 85 int group_fd, sibling_fd1, sibling_fd2; 86 87 group_fd = event_open(types[i], configs[i], -1); 88 if (group_fd == -1) 89 return -1; 90 91 sibling_fd1 = event_open(types[j], configs[j], group_fd); 92 if (sibling_fd1 == -1) { 93 close(group_fd); 94 return erroneous ? 0 : -1; 95 } 96 97 /* 98 * if all three events (leader and two sibling events) 99 * are hardware events, use instructions as one of the 100 * sibling event. There is event constraint in powerpc that 101 * events using same counter cannot be programmed in a group. 102 * Since PERF_COUNT_HW_INSTRUCTIONS is a generic hardware 103 * event and present in all platforms, lets use that. 104 */ 105 if (!i && !j && !k) 106 sibling_fd2 = event_open(types[k], configs_hw[k], group_fd); 107 else 108 sibling_fd2 = event_open(types[k], configs[k], group_fd); 109 if (sibling_fd2 == -1) { 110 close(sibling_fd1); 111 close(group_fd); 112 return erroneous ? 0 : -1; 113 } 114 115 close(sibling_fd2); 116 close(sibling_fd1); 117 close(group_fd); 118 return erroneous ? -1 : 0; 119 } 120 121 static int test__event_groups(struct test_suite *text __maybe_unused, int subtest __maybe_unused) 122 { 123 int i, j, k; 124 int ret; 125 int r; 126 127 ret = setup_uncore_event(); 128 if (ret || types[2] == -1) 129 return TEST_SKIP; 130 131 ret = TEST_OK; 132 for (i = 0; i < 3; i++) { 133 for (j = 0; j < 3; j++) { 134 for (k = 0; k < 3; k++) { 135 r = run_test(i, j, k); 136 if (r) 137 ret = TEST_FAIL; 138 139 /* 140 * For all three events as HW events, second sibling 141 * event is picked from configs_hw. So print accordingly 142 */ 143 if (!i && !j && !k) 144 pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n", 145 types[i], configs[i], types[j], configs[j], 146 types[k], configs_hw[k], r ? "Fail" : "Pass"); 147 else 148 pr_debug("0x%x 0x%lx, 0x%x 0x%lx, 0x%x 0x%lx: %s\n", 149 types[i], configs[i], types[j], configs[j], 150 types[k], configs[k], r ? "Fail" : "Pass"); 151 } 152 } 153 } 154 return ret; 155 } 156 157 DEFINE_SUITE("Event groups", event_groups); 158