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, sw: context-switch, uncore: [arch dependent] */ 14 static int types[] = {0, 1, -1}; 15 static unsigned long configs[] = {0, 3, 0}; 16 17 #define NR_UNCORE_PMUS 5 18 19 /* Uncore pmus that support more than 3 counters */ 20 static 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 31 static 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 is 41 * initialized with disabled set to 1 and any child events are 42 * initialized with disabled set to 0. Despite disabled being 0, 43 * the child events will not start until the group leader is 44 * 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 51 static 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 be 64 * used in the test. For example, incase of accessing 65 * hv_24x7 pmu counters, partition should have 66 * additional permissions. If not, event open will 67 * fail. So check if the event open succeeds 68 * 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 81 static 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 } 108 109 static 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 } 135 136 DEFINE_SUITE("Event groups", event_groups); 137