// SPDX-License-Identifier: GPL-2.0 /* * Copyright(C) 2015 Linaro Limited. All rights reserved. * Author: Mathieu Poirier */ #include #include #include #include #include #include #include #include #include #include #include "cs-etm.h" #include "../../../util/debug.h" #include "../../../util/record.h" #include "../../../util/auxtrace.h" #include "../../../util/cpumap.h" #include "../../../util/event.h" #include "../../../util/evlist.h" #include "../../../util/evsel.h" #include "../../../util/perf_api_probe.h" #include "../../../util/evsel_config.h" #include "../../../util/pmus.h" #include "../../../util/cs-etm.h" #include // page_size #include "../../../util/session.h" #include #include #include struct cs_etm_recording { struct auxtrace_record itr; struct perf_pmu *cs_etm_pmu; struct evlist *evlist; bool snapshot_mode; size_t snapshot_size; }; static const char *metadata_etmv3_ro[CS_ETM_PRIV_MAX] = { [CS_ETM_ETMCCER] = "mgmt/etmccer", [CS_ETM_ETMIDR] = "mgmt/etmidr", }; static const char * const metadata_etmv4_ro[] = { [CS_ETMV4_TRCIDR0] = "trcidr/trcidr0", [CS_ETMV4_TRCIDR1] = "trcidr/trcidr1", [CS_ETMV4_TRCIDR2] = "trcidr/trcidr2", [CS_ETMV4_TRCIDR8] = "trcidr/trcidr8", [CS_ETMV4_TRCAUTHSTATUS] = "mgmt/trcauthstatus", [CS_ETMV4_TS_SOURCE] = "ts_source", }; static const char * const metadata_ete_ro[] = { [CS_ETE_TRCIDR0] = "trcidr/trcidr0", [CS_ETE_TRCIDR1] = "trcidr/trcidr1", [CS_ETE_TRCIDR2] = "trcidr/trcidr2", [CS_ETE_TRCIDR8] = "trcidr/trcidr8", [CS_ETE_TRCAUTHSTATUS] = "mgmt/trcauthstatus", [CS_ETE_TRCDEVARCH] = "mgmt/trcdevarch", [CS_ETE_TS_SOURCE] = "ts_source", }; enum cs_etm_version { CS_NOT_PRESENT, CS_ETMV3, CS_ETMV4, CS_ETE }; static bool cs_etm_is_ete(struct perf_pmu *cs_etm_pmu, struct perf_cpu cpu); static int cs_etm_get_ro(struct perf_pmu *pmu, struct perf_cpu cpu, const char *path, __u64 *val); static bool cs_etm_pmu_path_exists(struct perf_pmu *pmu, struct perf_cpu cpu, const char *path); static enum cs_etm_version cs_etm_get_version(struct perf_pmu *cs_etm_pmu, struct perf_cpu cpu) { if (cs_etm_is_ete(cs_etm_pmu, cpu)) return CS_ETE; else if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0])) return CS_ETMV4; else if (cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_etmv3_ro[CS_ETM_ETMCCER])) return CS_ETMV3; return CS_NOT_PRESENT; } static int cs_etm_validate_context_id(struct perf_pmu *cs_etm_pmu, struct evsel *evsel, struct perf_cpu cpu) { int err; __u64 val; u64 contextid = evsel->core.attr.config & (perf_pmu__format_bits(cs_etm_pmu, "contextid") | perf_pmu__format_bits(cs_etm_pmu, "contextid1") | perf_pmu__format_bits(cs_etm_pmu, "contextid2")); if (!contextid) return 0; /* Not supported in etmv3 */ if (cs_etm_get_version(cs_etm_pmu, cpu) == CS_ETMV3) { pr_err("%s: contextid not supported in ETMv3, disable with %s/contextid=0/\n", CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); return -EINVAL; } /* Get a handle on TRCIDR2 */ err = cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR2], &val); if (err) return err; if (contextid & perf_pmu__format_bits(cs_etm_pmu, "contextid1")) { /* * TRCIDR2.CIDSIZE, bit [9-5], indicates whether contextID * tracing is supported: * 0b00000 Context ID tracing is not supported. * 0b00100 Maximum of 32-bit Context ID size. * All other values are reserved. */ if (BMVAL(val, 5, 9) != 0x4) { pr_err("%s: CONTEXTIDR_EL1 isn't supported, disable with %s/contextid1=0/\n", CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); return -EINVAL; } } if (contextid & perf_pmu__format_bits(cs_etm_pmu, "contextid2")) { /* * TRCIDR2.VMIDOPT[30:29] != 0 and * TRCIDR2.VMIDSIZE[14:10] == 0b00100 (32bit virtual contextid) * We can't support CONTEXTIDR in VMID if the size of the * virtual context id is < 32bit. * Any value of VMIDSIZE >= 4 (i.e, > 32bit) is fine for us. */ if (!BMVAL(val, 29, 30) || BMVAL(val, 10, 14) < 4) { pr_err("%s: CONTEXTIDR_EL2 isn't supported, disable with %s/contextid2=0/\n", CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); return -EINVAL; } } return 0; } static int cs_etm_validate_timestamp(struct perf_pmu *cs_etm_pmu, struct evsel *evsel, struct perf_cpu cpu) { int err; __u64 val; if (!(evsel->core.attr.config & perf_pmu__format_bits(cs_etm_pmu, "timestamp"))) return 0; if (cs_etm_get_version(cs_etm_pmu, cpu) == CS_ETMV3) { pr_err("%s: timestamp not supported in ETMv3, disable with %s/timestamp=0/\n", CORESIGHT_ETM_PMU_NAME, CORESIGHT_ETM_PMU_NAME); return -EINVAL; } /* Get a handle on TRCIRD0 */ err = cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0], &val); if (err) return err; /* * TRCIDR0.TSSIZE, bit [28-24], indicates whether global timestamping * is supported: * 0b00000 Global timestamping is not implemented * 0b00110 Implementation supports a maximum timestamp of 48bits. * 0b01000 Implementation supports a maximum timestamp of 64bits. */ val &= GENMASK(28, 24); if (!val) { return -EINVAL; } return 0; } static struct perf_pmu *cs_etm_get_pmu(struct auxtrace_record *itr) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); return ptr->cs_etm_pmu; } /* * Check whether the requested timestamp and contextid options should be * available on all requested CPUs and if not, tell the user how to override. * The kernel will silently disable any unavailable options so a warning here * first is better. In theory the kernel could still disable the option for * some other reason so this is best effort only. */ static int cs_etm_validate_config(struct perf_pmu *cs_etm_pmu, struct evsel *evsel) { int idx, err = 0; struct perf_cpu_map *event_cpus = evsel->evlist->core.user_requested_cpus; struct perf_cpu_map *intersect_cpus; struct perf_cpu cpu; /* * Set option of each CPU we have. In per-cpu case, do the validation * for CPUs to work with. In per-thread case, the CPU map has the "any" * CPU value. Since the traced program can run on any CPUs in this case, * thus don't skip validation. */ if (!perf_cpu_map__has_any_cpu(event_cpus)) { struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus(); intersect_cpus = perf_cpu_map__intersect(event_cpus, online_cpus); perf_cpu_map__put(online_cpus); } else { intersect_cpus = perf_cpu_map__new_online_cpus(); } perf_cpu_map__for_each_cpu_skip_any(cpu, idx, intersect_cpus) { if (cs_etm_get_version(cs_etm_pmu, cpu) == CS_NOT_PRESENT) { pr_err("%s: Not found on CPU %d. Check hardware and firmware support and that all Coresight drivers are loaded\n", CORESIGHT_ETM_PMU_NAME, cpu.cpu); return -EINVAL; } err = cs_etm_validate_context_id(cs_etm_pmu, evsel, cpu); if (err) break; err = cs_etm_validate_timestamp(cs_etm_pmu, evsel, cpu); if (err) break; } perf_cpu_map__put(intersect_cpus); return err; } static int cs_etm_parse_snapshot_options(struct auxtrace_record *itr, struct record_opts *opts, const char *str) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); unsigned long long snapshot_size = 0; char *endptr; if (str) { snapshot_size = strtoull(str, &endptr, 0); if (*endptr || snapshot_size > SIZE_MAX) return -1; } opts->auxtrace_snapshot_mode = true; opts->auxtrace_snapshot_size = snapshot_size; ptr->snapshot_size = snapshot_size; return 0; } static int cs_etm_set_sink_attr(struct perf_pmu *pmu, struct evsel *evsel) { char msg[BUFSIZ], path[PATH_MAX], *sink; struct evsel_config_term *term; int ret = -EINVAL; u32 hash; if (evsel->core.attr.config2 & GENMASK(31, 0)) return 0; list_for_each_entry(term, &evsel->config_terms, list) { if (term->type != EVSEL__CONFIG_TERM_DRV_CFG) continue; sink = term->val.str; snprintf(path, PATH_MAX, "sinks/%s", sink); ret = perf_pmu__scan_file(pmu, path, "%x", &hash); if (ret != 1) { if (errno == ENOENT) pr_err("Couldn't find sink \"%s\" on event %s\n" "Missing kernel or device support?\n\n" "Hint: An appropriate sink will be picked automatically if one isn't specified.\n", sink, evsel__name(evsel)); else pr_err("Failed to set sink \"%s\" on event %s with %d (%s)\n", sink, evsel__name(evsel), errno, str_error_r(errno, msg, sizeof(msg))); return ret; } evsel->core.attr.config2 |= hash; return 0; } /* * No sink was provided on the command line - allow the CoreSight * system to look for a default */ return 0; } static int cs_etm_recording_options(struct auxtrace_record *itr, struct evlist *evlist, struct record_opts *opts) { int ret; struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; struct evsel *evsel, *cs_etm_evsel = NULL; struct perf_cpu_map *cpus = evlist->core.user_requested_cpus; bool privileged = perf_event_paranoid_check(-1); int err = 0; evlist__for_each_entry(evlist, evsel) { if (evsel->core.attr.type == cs_etm_pmu->type) { if (cs_etm_evsel) { pr_err("There may be only one %s event\n", CORESIGHT_ETM_PMU_NAME); return -EINVAL; } cs_etm_evsel = evsel; } } /* no need to continue if at least one event of interest was found */ if (!cs_etm_evsel) return 0; ptr->evlist = evlist; ptr->snapshot_mode = opts->auxtrace_snapshot_mode; if (!record_opts__no_switch_events(opts) && perf_can_record_switch_events()) opts->record_switch_events = true; cs_etm_evsel->needs_auxtrace_mmap = true; opts->full_auxtrace = true; ret = cs_etm_set_sink_attr(cs_etm_pmu, cs_etm_evsel); if (ret) return ret; if (opts->use_clockid) { pr_err("Cannot use clockid (-k option) with %s\n", CORESIGHT_ETM_PMU_NAME); return -EINVAL; } /* we are in snapshot mode */ if (opts->auxtrace_snapshot_mode) { /* * No size were given to '-S' or '-m,', so go with * the default */ if (!opts->auxtrace_snapshot_size && !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; } } else if (!opts->auxtrace_mmap_pages && !privileged && opts->mmap_pages == UINT_MAX) { opts->mmap_pages = KiB(256) / page_size; } /* * '-m,xyz' was specified but no snapshot size, so make the * snapshot size as big as the auxtrace mmap area. */ if (!opts->auxtrace_snapshot_size) { opts->auxtrace_snapshot_size = opts->auxtrace_mmap_pages * (size_t)page_size; } /* * -Sxyz was specified but no auxtrace mmap area, so make the * auxtrace mmap area big enough to fit the requested snapshot * size. */ if (!opts->auxtrace_mmap_pages) { size_t sz = opts->auxtrace_snapshot_size; sz = round_up(sz, page_size) / page_size; opts->auxtrace_mmap_pages = roundup_pow_of_two(sz); } /* Snapshot size can't be bigger than the auxtrace area */ if (opts->auxtrace_snapshot_size > opts->auxtrace_mmap_pages * (size_t)page_size) { pr_err("Snapshot size %zu must not be greater than AUX area tracing mmap size %zu\n", opts->auxtrace_snapshot_size, opts->auxtrace_mmap_pages * (size_t)page_size); return -EINVAL; } /* Something went wrong somewhere - this shouldn't happen */ if (!opts->auxtrace_snapshot_size || !opts->auxtrace_mmap_pages) { pr_err("Failed to calculate default snapshot size and/or AUX area tracing mmap pages\n"); return -EINVAL; } } /* Buffer sizes weren't specified with '-m,xyz' so give some defaults */ if (!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; } } if (opts->auxtrace_snapshot_mode) pr_debug2("%s snapshot size: %zu\n", CORESIGHT_ETM_PMU_NAME, opts->auxtrace_snapshot_size); /* * To obtain the auxtrace buffer file descriptor, the auxtrace * event must come first. */ evlist__to_front(evlist, cs_etm_evsel); /* * get the CPU on the sample - need it to associate trace ID in the * AUX_OUTPUT_HW_ID event, and the AUX event for per-cpu mmaps. */ evsel__set_sample_bit(cs_etm_evsel, CPU); /* * Also the case of per-cpu mmaps, need the contextID in order to be notified * when a context switch happened. */ if (!perf_cpu_map__is_any_cpu_or_is_empty(cpus)) { evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, "timestamp", 1); evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, "contextid", 1); } /* * When the option '--timestamp' or '-T' is enabled, the PERF_SAMPLE_TIME * bit is set for all events. In this case, always enable Arm CoreSight * timestamp tracing. */ if (opts->sample_time_set) evsel__set_config_if_unset(cs_etm_pmu, cs_etm_evsel, "timestamp", 1); /* Add dummy event to keep tracking */ err = parse_event(evlist, "dummy:u"); if (err) goto out; evsel = evlist__last(evlist); evlist__set_tracking_event(evlist, evsel); evsel->core.attr.freq = 0; evsel->core.attr.sample_period = 1; /* In per-cpu case, always need the time of mmap events etc */ if (!perf_cpu_map__is_any_cpu_or_is_empty(cpus)) evsel__set_sample_bit(evsel, TIME); err = cs_etm_validate_config(cs_etm_pmu, cs_etm_evsel); out: return err; } static u64 cs_etm_get_config(struct auxtrace_record *itr) { u64 config = 0; struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; struct evlist *evlist = ptr->evlist; struct evsel *evsel; evlist__for_each_entry(evlist, evsel) { if (evsel->core.attr.type == cs_etm_pmu->type) { /* * Variable perf_event_attr::config is assigned to * ETMv3/PTM. The bit fields have been made to match * the ETMv3.5 ETRMCR register specification. See the * PMU_FORMAT_ATTR() declarations in * drivers/hwtracing/coresight/coresight-perf.c for * details. */ config = evsel->core.attr.config; break; } } return config; } #ifndef BIT #define BIT(N) (1UL << (N)) #endif static u64 cs_etmv4_get_config(struct auxtrace_record *itr) { u64 config = 0; u64 config_opts = 0; /* * The perf event variable config bits represent both * the command line options and register programming * bits in ETMv3/PTM. For ETMv4 we must remap options * to real bits */ config_opts = cs_etm_get_config(itr); if (config_opts & BIT(ETM_OPT_CYCACC)) config |= BIT(ETM4_CFG_BIT_CYCACC); if (config_opts & BIT(ETM_OPT_CTXTID)) config |= BIT(ETM4_CFG_BIT_CTXTID); if (config_opts & BIT(ETM_OPT_TS)) config |= BIT(ETM4_CFG_BIT_TS); if (config_opts & BIT(ETM_OPT_RETSTK)) config |= BIT(ETM4_CFG_BIT_RETSTK); if (config_opts & BIT(ETM_OPT_CTXTID2)) config |= BIT(ETM4_CFG_BIT_VMID) | BIT(ETM4_CFG_BIT_VMID_OPT); if (config_opts & BIT(ETM_OPT_BRANCH_BROADCAST)) config |= BIT(ETM4_CFG_BIT_BB); return config; } static size_t cs_etm_info_priv_size(struct auxtrace_record *itr, struct evlist *evlist) { int idx; int etmv3 = 0, etmv4 = 0, ete = 0; struct perf_cpu_map *event_cpus = evlist->core.user_requested_cpus; struct perf_cpu_map *intersect_cpus; struct perf_cpu cpu; struct perf_pmu *cs_etm_pmu = cs_etm_get_pmu(itr); if (!perf_cpu_map__has_any_cpu(event_cpus)) { /* cpu map is not "any" CPU , we have specific CPUs to work with */ struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus(); intersect_cpus = perf_cpu_map__intersect(event_cpus, online_cpus); perf_cpu_map__put(online_cpus); } else { /* Event can be "any" CPU so count all online CPUs. */ intersect_cpus = perf_cpu_map__new_online_cpus(); } /* Count number of each type of ETM. Don't count if that CPU has CS_NOT_PRESENT. */ perf_cpu_map__for_each_cpu_skip_any(cpu, idx, intersect_cpus) { enum cs_etm_version v = cs_etm_get_version(cs_etm_pmu, cpu); ete += v == CS_ETE; etmv4 += v == CS_ETMV4; etmv3 += v == CS_ETMV3; } perf_cpu_map__put(intersect_cpus); return (CS_ETM_HEADER_SIZE + (ete * CS_ETE_PRIV_SIZE) + (etmv4 * CS_ETMV4_PRIV_SIZE) + (etmv3 * CS_ETMV3_PRIV_SIZE)); } static int cs_etm_get_ro(struct perf_pmu *pmu, struct perf_cpu cpu, const char *path, __u64 *val) { char pmu_path[PATH_MAX]; int scan; /* Get RO metadata from sysfs */ snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu.cpu, path); scan = perf_pmu__scan_file(pmu, pmu_path, "%llx", val); if (scan != 1) { pr_err("%s: error reading: %s\n", __func__, pmu_path); return -EINVAL; } return 0; } static int cs_etm_get_ro_signed(struct perf_pmu *pmu, struct perf_cpu cpu, const char *path, __u64 *out_val) { char pmu_path[PATH_MAX]; int scan; int val = 0; /* Get RO metadata from sysfs */ snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu.cpu, path); scan = perf_pmu__scan_file(pmu, pmu_path, "%d", &val); if (scan != 1) { pr_err("%s: error reading: %s\n", __func__, pmu_path); return -EINVAL; } *out_val = (__u64) val; return 0; } static bool cs_etm_pmu_path_exists(struct perf_pmu *pmu, struct perf_cpu cpu, const char *path) { char pmu_path[PATH_MAX]; /* Get RO metadata from sysfs */ snprintf(pmu_path, PATH_MAX, "cpu%d/%s", cpu.cpu, path); return perf_pmu__file_exists(pmu, pmu_path); } #define TRCDEVARCH_ARCHPART_SHIFT 0 #define TRCDEVARCH_ARCHPART_MASK GENMASK(11, 0) #define TRCDEVARCH_ARCHPART(x) (((x) & TRCDEVARCH_ARCHPART_MASK) >> TRCDEVARCH_ARCHPART_SHIFT) #define TRCDEVARCH_ARCHVER_SHIFT 12 #define TRCDEVARCH_ARCHVER_MASK GENMASK(15, 12) #define TRCDEVARCH_ARCHVER(x) (((x) & TRCDEVARCH_ARCHVER_MASK) >> TRCDEVARCH_ARCHVER_SHIFT) static bool cs_etm_is_ete(struct perf_pmu *cs_etm_pmu, struct perf_cpu cpu) { __u64 trcdevarch; if (!cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH])) return false; cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH], &trcdevarch); /* * ETE if ARCHVER is 5 (ARCHVER is 4 for ETM) and ARCHPART is 0xA13. * See ETM_DEVARCH_ETE_ARCH in coresight-etm4x.h */ return TRCDEVARCH_ARCHVER(trcdevarch) == 5 && TRCDEVARCH_ARCHPART(trcdevarch) == 0xA13; } static __u64 cs_etm_get_legacy_trace_id(struct perf_cpu cpu) { /* Wrap at 48 so that invalid trace IDs aren't saved into files. */ return CORESIGHT_LEGACY_CPU_TRACE_ID(cpu.cpu % 48); } static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, struct perf_cpu cpu) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; /* Get trace configuration register */ data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr); /* traceID set to legacy version, in case new perf running on older system */ data[CS_ETMV4_TRCTRACEIDR] = cs_etm_get_legacy_trace_id(cpu); /* Get read-only information from sysFS */ cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR0], &data[CS_ETMV4_TRCIDR0]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR1], &data[CS_ETMV4_TRCIDR1]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR2], &data[CS_ETMV4_TRCIDR2]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCIDR8], &data[CS_ETMV4_TRCIDR8]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS], &data[CS_ETMV4_TRCAUTHSTATUS]); /* Kernels older than 5.19 may not expose ts_source */ if (!cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TS_SOURCE]) || cs_etm_get_ro_signed(cs_etm_pmu, cpu, metadata_etmv4_ro[CS_ETMV4_TS_SOURCE], &data[CS_ETMV4_TS_SOURCE])) { pr_debug3("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n", cpu.cpu); data[CS_ETMV4_TS_SOURCE] = (__u64) -1; } } static void cs_etm_save_ete_header(__u64 data[], struct auxtrace_record *itr, struct perf_cpu cpu) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; /* Get trace configuration register */ data[CS_ETE_TRCCONFIGR] = cs_etmv4_get_config(itr); /* traceID set to legacy version, in case new perf running on older system */ data[CS_ETE_TRCTRACEIDR] = cs_etm_get_legacy_trace_id(cpu); /* Get read-only information from sysFS */ cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCIDR0], &data[CS_ETE_TRCIDR0]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCIDR1], &data[CS_ETE_TRCIDR1]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCIDR2], &data[CS_ETE_TRCIDR2]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCIDR8], &data[CS_ETE_TRCIDR8]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCAUTHSTATUS], &data[CS_ETE_TRCAUTHSTATUS]); /* ETE uses the same registers as ETMv4 plus TRCDEVARCH */ cs_etm_get_ro(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TRCDEVARCH], &data[CS_ETE_TRCDEVARCH]); /* Kernels older than 5.19 may not expose ts_source */ if (!cs_etm_pmu_path_exists(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TS_SOURCE]) || cs_etm_get_ro_signed(cs_etm_pmu, cpu, metadata_ete_ro[CS_ETE_TS_SOURCE], &data[CS_ETE_TS_SOURCE])) { pr_debug3("[%03d] pmu file 'ts_source' not found. Fallback to safe value (-1)\n", cpu.cpu); data[CS_ETE_TS_SOURCE] = (__u64) -1; } } static void cs_etm_get_metadata(struct perf_cpu cpu, u32 *offset, struct auxtrace_record *itr, struct perf_record_auxtrace_info *info) { u32 increment, nr_trc_params; u64 magic; struct perf_pmu *cs_etm_pmu = cs_etm_get_pmu(itr); /* first see what kind of tracer this cpu is affined to */ switch (cs_etm_get_version(cs_etm_pmu, cpu)) { case CS_ETE: magic = __perf_cs_ete_magic; cs_etm_save_ete_header(&info->priv[*offset], itr, cpu); /* How much space was used */ increment = CS_ETE_PRIV_MAX; nr_trc_params = CS_ETE_PRIV_MAX - CS_ETM_COMMON_BLK_MAX_V1; break; case CS_ETMV4: magic = __perf_cs_etmv4_magic; cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu); /* How much space was used */ increment = CS_ETMV4_PRIV_MAX; nr_trc_params = CS_ETMV4_PRIV_MAX - CS_ETMV4_TRCCONFIGR; break; case CS_ETMV3: magic = __perf_cs_etmv3_magic; /* Get configuration register */ info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr); /* traceID set to legacy value in case new perf running on old system */ info->priv[*offset + CS_ETM_ETMTRACEIDR] = cs_etm_get_legacy_trace_id(cpu); /* Get read-only information from sysFS */ cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv3_ro[CS_ETM_ETMCCER], &info->priv[*offset + CS_ETM_ETMCCER]); cs_etm_get_ro(cs_etm_pmu, cpu, metadata_etmv3_ro[CS_ETM_ETMIDR], &info->priv[*offset + CS_ETM_ETMIDR]); /* How much space was used */ increment = CS_ETM_PRIV_MAX; nr_trc_params = CS_ETM_PRIV_MAX - CS_ETM_ETMCR; break; default: case CS_NOT_PRESENT: /* Unreachable, CPUs already validated in cs_etm_validate_config() */ assert(true); return; } /* Build generic header portion */ info->priv[*offset + CS_ETM_MAGIC] = magic; info->priv[*offset + CS_ETM_CPU] = cpu.cpu; info->priv[*offset + CS_ETM_NR_TRC_PARAMS] = nr_trc_params; /* Where the next CPU entry should start from */ *offset += increment; } static int cs_etm_info_fill(struct auxtrace_record *itr, struct perf_session *session, struct perf_record_auxtrace_info *info, size_t priv_size) { int i; u32 offset; u64 nr_cpu, type; struct perf_cpu_map *cpu_map; struct perf_cpu_map *event_cpus = session->evlist->core.user_requested_cpus; struct perf_cpu_map *online_cpus = perf_cpu_map__new_online_cpus(); struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu; struct perf_cpu cpu; if (priv_size != cs_etm_info_priv_size(itr, session->evlist)) return -EINVAL; if (!session->evlist->core.nr_mmaps) return -EINVAL; /* If the cpu_map has the "any" CPU all online CPUs are involved */ if (perf_cpu_map__has_any_cpu(event_cpus)) { cpu_map = online_cpus; } else { /* Make sure all specified CPUs are online */ perf_cpu_map__for_each_cpu(cpu, i, event_cpus) { if (!perf_cpu_map__has(online_cpus, cpu)) return -EINVAL; } cpu_map = event_cpus; } nr_cpu = perf_cpu_map__nr(cpu_map); /* Get PMU type as dynamically assigned by the core */ type = cs_etm_pmu->type; /* First fill out the session header */ info->type = PERF_AUXTRACE_CS_ETM; info->priv[CS_HEADER_VERSION] = CS_HEADER_CURRENT_VERSION; info->priv[CS_PMU_TYPE_CPUS] = type << 32; info->priv[CS_PMU_TYPE_CPUS] |= nr_cpu; info->priv[CS_ETM_SNAPSHOT] = ptr->snapshot_mode; offset = CS_ETM_SNAPSHOT + 1; perf_cpu_map__for_each_cpu(cpu, i, cpu_map) { assert(offset < priv_size); cs_etm_get_metadata(cpu, &offset, itr, info); } perf_cpu_map__put(online_cpus); return 0; } static int cs_etm_snapshot_start(struct auxtrace_record *itr) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct evsel *evsel; evlist__for_each_entry(ptr->evlist, evsel) { if (evsel->core.attr.type == ptr->cs_etm_pmu->type) return evsel__disable(evsel); } return -EINVAL; } static int cs_etm_snapshot_finish(struct auxtrace_record *itr) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); struct evsel *evsel; evlist__for_each_entry(ptr->evlist, evsel) { if (evsel->core.attr.type == ptr->cs_etm_pmu->type) return evsel__enable(evsel); } return -EINVAL; } static u64 cs_etm_reference(struct auxtrace_record *itr __maybe_unused) { return (((u64) rand() << 0) & 0x00000000FFFFFFFFull) | (((u64) rand() << 32) & 0xFFFFFFFF00000000ull); } static void cs_etm_recording_free(struct auxtrace_record *itr) { struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr); free(ptr); } struct auxtrace_record *cs_etm_record_init(int *err) { struct perf_pmu *cs_etm_pmu; struct cs_etm_recording *ptr; cs_etm_pmu = perf_pmus__find(CORESIGHT_ETM_PMU_NAME); if (!cs_etm_pmu) { *err = -EINVAL; goto out; } ptr = zalloc(sizeof(struct cs_etm_recording)); if (!ptr) { *err = -ENOMEM; goto out; } ptr->cs_etm_pmu = cs_etm_pmu; ptr->itr.parse_snapshot_options = cs_etm_parse_snapshot_options; ptr->itr.recording_options = cs_etm_recording_options; ptr->itr.info_priv_size = cs_etm_info_priv_size; ptr->itr.info_fill = cs_etm_info_fill; ptr->itr.snapshot_start = cs_etm_snapshot_start; ptr->itr.snapshot_finish = cs_etm_snapshot_finish; ptr->itr.reference = cs_etm_reference; ptr->itr.free = cs_etm_recording_free; ptr->itr.read_finish = auxtrace_record__read_finish; *err = 0; return &ptr->itr; out: return NULL; } /* * Set a default config to enable the user changed config tracking mechanism * (CFG_CHG and evsel__set_config_if_unset()). If no default is set then user * changes aren't tracked. */ void cs_etm_get_default_config(const struct perf_pmu *pmu __maybe_unused, struct perf_event_attr *attr) { attr->sample_period = 1; }