| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright(C) 2015 Linaro Limited. All rights reserved. |
| 4 | * Author: Mathieu Poirier <mathieu.poirier@linaro.org> |
| 5 | */ |
| 6 | |
| 7 | #include <stdbool.h> |
| 8 | #include <linux/coresight-pmu.h> |
| 9 | #include <linux/zalloc.h> |
| 10 | |
| 11 | #include "../../util/auxtrace.h" |
| 12 | #include "../../util/debug.h" |
| 13 | #include "../../util/evlist.h" |
| 14 | #include "../../util/pmu.h" |
| 15 | #include "cs-etm.h" |
| 16 | #include "arm-spe.h" |
| 17 | |
| 18 | static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err) |
| 19 | { |
| 20 | struct perf_pmu **arm_spe_pmus = NULL; |
| 21 | int ret, i, nr_cpus = sysconf(_SC_NPROCESSORS_CONF); |
| 22 | /* arm_spe_xxxxxxxxx\0 */ |
| 23 | char arm_spe_pmu_name[sizeof(ARM_SPE_PMU_NAME) + 10]; |
| 24 | |
| 25 | arm_spe_pmus = zalloc(sizeof(struct perf_pmu *) * nr_cpus); |
| 26 | if (!arm_spe_pmus) { |
| 27 | pr_err("spes alloc failed\n"); |
| 28 | *err = -ENOMEM; |
| 29 | return NULL; |
| 30 | } |
| 31 | |
| 32 | for (i = 0; i < nr_cpus; i++) { |
| 33 | ret = sprintf(arm_spe_pmu_name, "%s%d", ARM_SPE_PMU_NAME, i); |
| 34 | if (ret < 0) { |
| 35 | pr_err("sprintf failed\n"); |
| 36 | *err = -ENOMEM; |
| 37 | return NULL; |
| 38 | } |
| 39 | |
| 40 | arm_spe_pmus[*nr_spes] = perf_pmu__find(arm_spe_pmu_name); |
| 41 | if (arm_spe_pmus[*nr_spes]) { |
| 42 | pr_debug2("%s %d: arm_spe_pmu %d type %d name %s\n", |
| 43 | __func__, __LINE__, *nr_spes, |
| 44 | arm_spe_pmus[*nr_spes]->type, |
| 45 | arm_spe_pmus[*nr_spes]->name); |
| 46 | (*nr_spes)++; |
| 47 | } |
| 48 | } |
| 49 | |
| 50 | return arm_spe_pmus; |
| 51 | } |
| 52 | |
| 53 | struct auxtrace_record |
| 54 | *auxtrace_record__init(struct evlist *evlist, int *err) |
| 55 | { |
| 56 | struct perf_pmu *cs_etm_pmu; |
| 57 | struct evsel *evsel; |
| 58 | bool found_etm = false; |
| 59 | struct perf_pmu *found_spe = NULL; |
| 60 | static struct perf_pmu **arm_spe_pmus = NULL; |
| 61 | static int nr_spes = 0; |
| 62 | int i = 0; |
| 63 | |
| 64 | if (!evlist) |
| 65 | return NULL; |
| 66 | |
| 67 | cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME); |
| 68 | |
| 69 | if (!arm_spe_pmus) |
| 70 | arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err); |
| 71 | |
| 72 | evlist__for_each_entry(evlist, evsel) { |
| 73 | if (cs_etm_pmu && |
| 74 | evsel->core.attr.type == cs_etm_pmu->type) |
| 75 | found_etm = true; |
| 76 | |
| 77 | if (!nr_spes || found_spe) |
| 78 | continue; |
| 79 | |
| 80 | for (i = 0; i < nr_spes; i++) { |
| 81 | if (evsel->core.attr.type == arm_spe_pmus[i]->type) { |
| 82 | found_spe = arm_spe_pmus[i]; |
| 83 | break; |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | if (found_etm && found_spe) { |
| 89 | pr_err("Concurrent ARM Coresight ETM and SPE operation not currently supported\n"); |
| 90 | *err = -EOPNOTSUPP; |
| 91 | return NULL; |
| 92 | } |
| 93 | |
| 94 | if (found_etm) |
| 95 | return cs_etm_record_init(err); |
| 96 | |
| 97 | #if defined(__aarch64__) |
| 98 | if (found_spe) |
| 99 | return arm_spe_recording_init(err, found_spe); |
| 100 | #endif |
| 101 | |
| 102 | /* |
| 103 | * Clear 'err' even if we haven't found an event - that way perf |
| 104 | * record can still be used even if tracers aren't present. The NULL |
| 105 | * return value will take care of telling the infrastructure HW tracing |
| 106 | * isn't available. |
| 107 | */ |
| 108 | *err = 0; |
| 109 | return NULL; |
| 110 | } |