// SPDX-License-Identifier: GPL-2.0 #include <stdio.h> #include "api/fs/fs.h" #include "util/pmu.h" #include "util/topdown.h" /* * 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 static bool is_topdown_slots_event(struct evsel *counter) { if (!counter->pmu_name) return false; if (strcmp(counter->pmu_name, "cpu")) return false; if (counter->core.attr.config == TOPDOWN_SLOTS) return true; return false; } /* * Check whether a topdown group supports sample-read. * * Only Topdown metic supports sample-read. The slots * event must be the leader of the topdown group. */ bool arch_topdown_sample_read(struct evsel *leader) { if (!pmu_have_event("cpu", "slots")) return false; if (is_topdown_slots_event(leader)) return true; return false; }