1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <internal/cpumap.h> 4 #include "../../../util/cpumap.h" 5 #include "../../../util/pmu.h" 6 #include "../../../util/pmus.h" 7 #include <api/fs/fs.h> 8 #include <math.h> 9 10 static struct perf_pmu *pmu__find_core_pmu(void) 11 { 12 struct perf_pmu *pmu = NULL; 13 14 while ((pmu = perf_pmus__scan_core(pmu))) { 15 /* 16 * The cpumap should cover all CPUs. Otherwise, some CPUs may 17 * not support some events or have different event IDs. 18 */ 19 if (RC_CHK_ACCESS(pmu->cpus)->nr != cpu__max_cpu().cpu) 20 return NULL; 21 22 return pmu; 23 } 24 return NULL; 25 } 26 27 const struct pmu_metrics_table *pmu_metrics_table__find(void) 28 { 29 struct perf_pmu *pmu = pmu__find_core_pmu(); 30 31 if (pmu) 32 return perf_pmu__find_metrics_table(pmu); 33 34 return NULL; 35 } 36 37 const struct pmu_events_table *pmu_events_table__find(void) 38 { 39 struct perf_pmu *pmu = pmu__find_core_pmu(); 40 41 if (pmu) 42 return perf_pmu__find_events_table(pmu); 43 44 return NULL; 45 } 46 47 double perf_pmu__cpu_slots_per_cycle(void) 48 { 49 char path[PATH_MAX]; 50 unsigned long long slots = 0; 51 struct perf_pmu *pmu = pmu__find_core_pmu(); 52 53 if (pmu) { 54 perf_pmu__pathname_scnprintf(path, sizeof(path), 55 pmu->name, "caps/slots"); 56 /* 57 * The value of slots is not greater than 32 bits, but sysfs__read_int 58 * can't read value with 0x prefix, so use sysfs__read_ull instead. 59 */ 60 sysfs__read_ull(path, &slots); 61 } 62 63 return slots ? (double)slots : NAN; 64 } 65