diff options
Diffstat (limited to 'tools/perf/arch/arm64/util/arm-spe.c')
| -rw-r--r-- | tools/perf/arch/arm64/util/arm-spe.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c new file mode 100644 index 000000000000..1120e39c1b00 --- /dev/null +++ b/tools/perf/arch/arm64/util/arm-spe.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Arm Statistical Profiling Extensions (SPE) support + * Copyright (c) 2017-2018, Arm Ltd. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/bitops.h> +#include <linux/log2.h> +#include <time.h> + +#include "../../util/cpumap.h" +#include "../../util/evsel.h" +#include "../../util/evlist.h" +#include "../../util/session.h" +#include "../../util/util.h" +#include "../../util/pmu.h" +#include "../../util/debug.h" +#include "../../util/auxtrace.h" +#include "../../util/arm-spe.h" + +#define KiB(x) ((x) * 1024) +#define MiB(x) ((x) * 1024 * 1024) + +struct arm_spe_recording { + struct auxtrace_record itr; + struct perf_pmu *arm_spe_pmu; + struct perf_evlist *evlist; +}; + +static size_t +arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused, + struct perf_evlist *evlist __maybe_unused) +{ + return ARM_SPE_AUXTRACE_PRIV_SIZE; +} + +static int arm_spe_info_fill(struct auxtrace_record *itr, + struct perf_session *session, + struct auxtrace_info_event *auxtrace_info, + size_t priv_size) +{ + struct arm_spe_recording *sper = + container_of(itr, struct arm_spe_recording, itr); + struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu; + + if (priv_size != ARM_SPE_AUXTRACE_PRIV_SIZE) + return -EINVAL; + + if (!session->evlist->nr_mmaps) + return -EINVAL; + + auxtrace_info->type = PERF_AUXTRACE_ARM_SPE; + auxtrace_info->priv[ARM_SPE_PMU_TYPE] = arm_spe_pmu->type; + + return 0; +} + +static int arm_spe_recording_options(struct auxtrace_record *itr, + struct perf_evlist *evlist, + struct record_opts *opts) +{ + struct arm_spe_recording *sper = + container_of(itr, struct arm_spe_recording, itr); + struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu; + struct perf_evsel *evsel, *arm_spe_evsel = NULL; + bool privileged = geteuid() == 0 || perf_event_paranoid() < 0; + struct perf_evsel *tracking_evsel; + int err; + + sper->evlist = evlist; + + evlist__for_each_entry(evlist, evsel) { + if (evsel->attr.type == arm_spe_pmu->type) { + if (arm_spe_evsel) { + pr_err("There may be only one " ARM_SPE_PMU_NAME "x event\n"); + return -EINVAL; + } + evsel->attr.freq = 0; + evsel->attr.sample_period = 1; + arm_spe_evsel = evsel; + opts->full_auxtrace = true; + } + } + + if (!opts->full_auxtrace) + return 0; + + /* We are in full trace mode but '-m,xyz' wasn't specified */ + if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) { + if (privileged) { + opts->auxtrace_mmap_pages = MiB(4) / page_size; + } else { + opts->auxtrace_mmap_pages = KiB(128) / page_size; + if (opts->mmap_pages == UINT_MAX) + opts->mmap_pages = KiB(256) / page_size; + } + } + + /* Validate auxtrace_mmap_pages */ + if (opts->auxtrace_mmap_pages) { + size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size; + size_t min_sz = KiB(8); + + if (sz < min_sz || !is_power_of_2(sz)) { + pr_err("Invalid mmap size for ARM SPE: must be at least %zuKiB and a power of 2\n", + min_sz / 1024); + return -EINVAL; + } + } + + + /* + * To obtain the auxtrace buffer file descriptor, the auxtrace event + * must come first. + */ + perf_evlist__to_front(evlist, arm_spe_evsel); + + perf_evsel__set_sample_bit(arm_spe_evsel, CPU); + perf_evsel__set_sample_bit(arm_spe_evsel, TIME); + perf_evsel__set_sample_bit(arm_spe_evsel, TID); + + /* Add dummy event to keep tracking */ + err = parse_events(evlist, "dummy:u", NULL); + if (err) + return err; + + tracking_evsel = perf_evlist__last(evlist); + perf_evlist__set_tracking_event(evlist, tracking_evsel); + + tracking_evsel->attr.freq = 0; + tracking_evsel->attr.sample_period = 1; + perf_evsel__set_sample_bit(tracking_evsel, TIME); + perf_evsel__set_sample_bit(tracking_evsel, CPU); + perf_evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK); + + return 0; +} + +static u64 arm_spe_reference(struct auxtrace_record *itr __maybe_unused) +{ + struct timespec ts; + + clock_gettime(CLOCK_MONOTONIC_RAW, &ts); + + return ts.tv_sec ^ ts.tv_nsec; +} + +static void arm_spe_recording_free(struct auxtrace_record *itr) +{ + struct arm_spe_recording *sper = + container_of(itr, struct arm_spe_recording, itr); + + free(sper); +} + +static int arm_spe_read_finish(struct auxtrace_record *itr, int idx) +{ + struct arm_spe_recording *sper = + container_of(itr, struct arm_spe_recording, itr); + struct perf_evsel *evsel; + + evlist__for_each_entry(sper->evlist, evsel) { + if (evsel->attr.type == sper->arm_spe_pmu->type) + return perf_evlist__enable_event_idx(sper->evlist, + evsel, idx); + } + return -EINVAL; +} + +struct auxtrace_record *arm_spe_recording_init(int *err, + struct perf_pmu *arm_spe_pmu) +{ + struct arm_spe_recording *sper; + + if (!arm_spe_pmu) { + *err = -ENODEV; + return NULL; + } + + sper = zalloc(sizeof(struct arm_spe_recording)); + if (!sper) { + *err = -ENOMEM; + return NULL; + } + + sper->arm_spe_pmu = arm_spe_pmu; + sper->itr.recording_options = arm_spe_recording_options; + sper->itr.info_priv_size = arm_spe_info_priv_size; + sper->itr.info_fill = arm_spe_info_fill; + sper->itr.free = arm_spe_recording_free; + sper->itr.reference = arm_spe_reference; + sper->itr.read_finish = arm_spe_read_finish; + sper->itr.alignment = 0; + + return &sper->itr; +} + +struct perf_event_attr +*arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu) +{ + struct perf_event_attr *attr; + + attr = zalloc(sizeof(struct perf_event_attr)); + if (!attr) { + pr_err("arm_spe default config cannot allocate a perf_event_attr\n"); + return NULL; + } + + /* + * If kernel driver doesn't advertise a minimum, + * use max allowable by PMSIDR_EL1.INTERVAL + */ + if (perf_pmu__scan_file(arm_spe_pmu, "caps/min_interval", "%llu", + &attr->sample_period) != 1) { + pr_debug("arm_spe driver doesn't advertise a min. interval. Using 4096\n"); + attr->sample_period = 4096; + } + + arm_spe_pmu->selectable = true; + arm_spe_pmu->is_uncore = false; + + return attr; +} |