1ea8d0ed6SKan Liang // SPDX-License-Identifier: GPL-2.0 2ea8d0ed6SKan Liang #include <stdio.h> 3*eb39bf32SRavi Bangoria #include <stdlib.h> 4ea8d0ed6SKan Liang #include "util/evsel.h" 5*eb39bf32SRavi Bangoria #include "util/env.h" 6*eb39bf32SRavi Bangoria #include "linux/string.h" 7ea8d0ed6SKan Liang 8ea8d0ed6SKan Liang void arch_evsel__set_sample_weight(struct evsel *evsel) 9ea8d0ed6SKan Liang { 10ea8d0ed6SKan Liang evsel__set_sample_bit(evsel, WEIGHT_STRUCT); 11ea8d0ed6SKan Liang } 12*eb39bf32SRavi Bangoria 13*eb39bf32SRavi Bangoria void arch_evsel__fixup_new_cycles(struct perf_event_attr *attr) 14*eb39bf32SRavi Bangoria { 15*eb39bf32SRavi Bangoria struct perf_env env = { .total_mem = 0, } ; 16*eb39bf32SRavi Bangoria 17*eb39bf32SRavi Bangoria if (!perf_env__cpuid(&env)) 18*eb39bf32SRavi Bangoria return; 19*eb39bf32SRavi Bangoria 20*eb39bf32SRavi Bangoria /* 21*eb39bf32SRavi Bangoria * On AMD, precise cycles event sampling internally uses IBS pmu. 22*eb39bf32SRavi Bangoria * But IBS does not have filtering capabilities and perf by default 23*eb39bf32SRavi Bangoria * sets exclude_guest = 1. This makes IBS pmu event init fail and 24*eb39bf32SRavi Bangoria * thus perf ends up doing non-precise sampling. Avoid it by clearing 25*eb39bf32SRavi Bangoria * exclude_guest. 26*eb39bf32SRavi Bangoria */ 27*eb39bf32SRavi Bangoria if (env.cpuid && strstarts(env.cpuid, "AuthenticAMD")) 28*eb39bf32SRavi Bangoria attr->exclude_guest = 0; 29*eb39bf32SRavi Bangoria 30*eb39bf32SRavi Bangoria free(env.cpuid); 31*eb39bf32SRavi Bangoria } 32