| // SPDX-License-Identifier: GPL-2.0 |
| #include <stdio.h> |
| #include "api/fs/fs.h" |
| #include "util/pmu.h" |
| #include "util/topdown.h" |
| #include "util/evlist.h" |
| #include "util/debug.h" |
| #include "util/pmu-hybrid.h" |
| #include "topdown.h" |
| #include "evsel.h" |
| |
| #define TOPDOWN_L1_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}" |
| #define TOPDOWN_L1_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/}" |
| #define TOPDOWN_L2_EVENTS "{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}" |
| #define TOPDOWN_L2_EVENTS_CORE "{slots,cpu_core/topdown-retiring/,cpu_core/topdown-bad-spec/,cpu_core/topdown-fe-bound/,cpu_core/topdown-be-bound/,cpu_core/topdown-heavy-ops/,cpu_core/topdown-br-mispredict/,cpu_core/topdown-fetch-lat/,cpu_core/topdown-mem-bound/}" |
| |
| /* Check whether there is a PMU which supports the perf metrics. */ |
| bool topdown_sys_has_perf_metrics(void) |
| { |
| static bool has_perf_metrics; |
| static bool cached; |
| struct perf_pmu *pmu; |
| |
| if (cached) |
| return has_perf_metrics; |
| |
| /* |
| * The perf metrics feature is a core PMU feature. |
| * The PERF_TYPE_RAW type is the type of a core PMU. |
| * The slots event is only available when the core PMU |
| * supports the perf metrics feature. |
| */ |
| pmu = perf_pmu__find_by_type(PERF_TYPE_RAW); |
| if (pmu && pmu_have_event(pmu->name, "slots")) |
| has_perf_metrics = true; |
| |
| cached = true; |
| return has_perf_metrics; |
| } |
| |
| /* |
| * Check whether we can use a group for top down. |
| * Without a group may get bad results due to multiplexing. |
| */ |
| bool arch_topdown_check_group(bool *warn) |
| { |
| int n; |
| |
| if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0) |
| return false; |
| if (n > 0) { |
| *warn = true; |
| return false; |
| } |
| return true; |
| } |
| |
| void arch_topdown_group_warn(void) |
| { |
| fprintf(stderr, |
| "nmi_watchdog enabled with topdown. May give wrong results.\n" |
| "Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n"); |
| } |
| |
| #define TOPDOWN_SLOTS 0x0400 |
| |
| /* |
| * Check whether a topdown group supports sample-read. |
| * |
| * Only Topdown metric supports sample-read. The slots |
| * event must be the leader of the topdown group. |
| */ |
| |
| bool arch_topdown_sample_read(struct evsel *leader) |
| { |
| if (!evsel__sys_has_perf_metrics(leader)) |
| return false; |
| |
| if (leader->core.attr.config == TOPDOWN_SLOTS) |
| return true; |
| |
| return false; |
| } |
| |
| const char *arch_get_topdown_pmu_name(struct evlist *evlist, bool warn) |
| { |
| const char *pmu_name; |
| |
| if (!perf_pmu__has_hybrid()) |
| return "cpu"; |
| |
| if (!evlist->hybrid_pmu_name) { |
| if (warn) |
| pr_warning("WARNING: default to use cpu_core topdown events\n"); |
| evlist->hybrid_pmu_name = perf_pmu__hybrid_type_to_pmu("core"); |
| } |
| |
| pmu_name = evlist->hybrid_pmu_name; |
| |
| return pmu_name; |
| } |
| |
| int topdown_parse_events(struct evlist *evlist) |
| { |
| const char *topdown_events; |
| const char *pmu_name; |
| |
| if (!topdown_sys_has_perf_metrics()) |
| return 0; |
| |
| pmu_name = arch_get_topdown_pmu_name(evlist, false); |
| |
| if (pmu_have_event(pmu_name, "topdown-heavy-ops")) { |
| if (!strcmp(pmu_name, "cpu_core")) |
| topdown_events = TOPDOWN_L2_EVENTS_CORE; |
| else |
| topdown_events = TOPDOWN_L2_EVENTS; |
| } else { |
| if (!strcmp(pmu_name, "cpu_core")) |
| topdown_events = TOPDOWN_L1_EVENTS_CORE; |
| else |
| topdown_events = TOPDOWN_L1_EVENTS; |
| } |
| |
| return parse_event(evlist, topdown_events); |
| } |