cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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auxtrace.c (1684B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * auxtrace.c: AUX area tracing support
      4 * Copyright (c) 2013-2014, Intel Corporation.
      5 */
      6
      7#include <errno.h>
      8#include <stdbool.h>
      9
     10#include "../../../util/header.h"
     11#include "../../../util/debug.h"
     12#include "../../../util/pmu.h"
     13#include "../../../util/auxtrace.h"
     14#include "../../../util/intel-pt.h"
     15#include "../../../util/intel-bts.h"
     16#include "../../../util/evlist.h"
     17
     18static
     19struct auxtrace_record *auxtrace_record__init_intel(struct evlist *evlist,
     20						    int *err)
     21{
     22	struct perf_pmu *intel_pt_pmu;
     23	struct perf_pmu *intel_bts_pmu;
     24	struct evsel *evsel;
     25	bool found_pt = false;
     26	bool found_bts = false;
     27
     28	intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
     29	if (intel_pt_pmu)
     30		intel_pt_pmu->auxtrace = true;
     31	intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
     32	if (intel_bts_pmu)
     33		intel_bts_pmu->auxtrace = true;
     34
     35	evlist__for_each_entry(evlist, evsel) {
     36		if (intel_pt_pmu && evsel->core.attr.type == intel_pt_pmu->type)
     37			found_pt = true;
     38		if (intel_bts_pmu && evsel->core.attr.type == intel_bts_pmu->type)
     39			found_bts = true;
     40	}
     41
     42	if (found_pt && found_bts) {
     43		pr_err("intel_pt and intel_bts may not be used together\n");
     44		*err = -EINVAL;
     45		return NULL;
     46	}
     47
     48	if (found_pt)
     49		return intel_pt_recording_init(err);
     50
     51	if (found_bts)
     52		return intel_bts_recording_init(err);
     53
     54	return NULL;
     55}
     56
     57struct auxtrace_record *auxtrace_record__init(struct evlist *evlist,
     58					      int *err)
     59{
     60	char buffer[64];
     61	int ret;
     62
     63	*err = 0;
     64
     65	ret = get_cpuid(buffer, sizeof(buffer));
     66	if (ret) {
     67		*err = ret;
     68		return NULL;
     69	}
     70
     71	if (!strncmp(buffer, "GenuineIntel,", 13))
     72		return auxtrace_record__init_intel(evlist, err);
     73
     74	return NULL;
     75}