1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright(C) 2015 Linaro Limited. All rights reserved.
4 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
8 #include <linux/coresight-pmu.h>
9 #include <linux/zalloc.h>
11 #include "../../../util/auxtrace.h"
12 #include "../../../util/debug.h"
13 #include "../../../util/evlist.h"
14 #include "../../../util/pmu.h"
18 static struct perf_pmu **find_all_arm_spe_pmus(int *nr_spes, int *err)
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];
25 arm_spe_pmus = zalloc(sizeof(struct perf_pmu *) * nr_cpus);
27 pr_err("spes alloc failed\n");
32 for (i = 0; i < nr_cpus; i++) {
33 ret = sprintf(arm_spe_pmu_name, "%s%d", ARM_SPE_PMU_NAME, i);
35 pr_err("sprintf failed\n");
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);
53 static struct perf_pmu *find_pmu_for_event(struct perf_pmu **pmus,
54 int pmu_nr, struct evsel *evsel)
61 for (i = 0; i < pmu_nr; i++) {
62 if (evsel->core.attr.type == pmus[i]->type)
69 struct auxtrace_record
70 *auxtrace_record__init(struct evlist *evlist, int *err)
72 struct perf_pmu *cs_etm_pmu = NULL;
73 struct perf_pmu **arm_spe_pmus = NULL;
75 struct perf_pmu *found_etm = NULL;
76 struct perf_pmu *found_spe = NULL;
77 int auxtrace_event_cnt = 0;
83 cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);
84 arm_spe_pmus = find_all_arm_spe_pmus(&nr_spes, err);
86 evlist__for_each_entry(evlist, evsel) {
87 if (cs_etm_pmu && !found_etm)
88 found_etm = find_pmu_for_event(&cs_etm_pmu, 1, evsel);
90 if (arm_spe_pmus && !found_spe)
91 found_spe = find_pmu_for_event(arm_spe_pmus, nr_spes, evsel);
100 auxtrace_event_cnt++;
102 if (auxtrace_event_cnt > 1) {
103 pr_err("Concurrent AUX trace operation not currently supported\n");
109 return cs_etm_record_init(err);
111 #if defined(__aarch64__)
113 return arm_spe_recording_init(err, found_spe);
117 * Clear 'err' even if we haven't found an event - that way perf
118 * record can still be used even if tracers aren't present. The NULL
119 * return value will take care of telling the infrastructure HW tracing
127 u64 compat_auxtrace_mmap__read_head(struct auxtrace_mmap *mm)
129 struct perf_event_mmap_page *pc = mm->userpg;
132 __asm__ __volatile__(
133 " ldrd %0, %H0, [%1]"
135 : "r" (&pc->aux_head), "Qo" (pc->aux_head)
141 int compat_auxtrace_mmap__write_tail(struct auxtrace_mmap *mm, u64 tail)
143 struct perf_event_mmap_page *pc = mm->userpg;
145 /* Ensure all reads are done before we write the tail out */
148 __asm__ __volatile__(
149 " strd %2, %H2, [%1]"
150 : "=Qo" (pc->aux_tail)
151 : "r" (&pc->aux_tail), "r" (tail)