1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * HiSilicon PCIe Trace and Tuning (PTT) support 4 * Copyright (c) 2022 HiSilicon Technologies Co., Ltd. 5 */ 6 7 #include <linux/kernel.h> 8 #include <linux/types.h> 9 #include <linux/bitops.h> 10 #include <linux/log2.h> 11 #include <linux/zalloc.h> 12 #include <time.h> 13 14 #include <internal/lib.h> // page_size 15 #include "../../../util/auxtrace.h" 16 #include "../../../util/cpumap.h" 17 #include "../../../util/debug.h" 18 #include "../../../util/event.h" 19 #include "../../../util/evlist.h" 20 #include "../../../util/evsel.h" 21 #include "../../../util/hisi-ptt.h" 22 #include "../../../util/pmu.h" 23 #include "../../../util/record.h" 24 #include "../../../util/session.h" 25 #include "../../../util/tsc.h" 26 27 #define KiB(x) ((x) * 1024) 28 #define MiB(x) ((x) * 1024 * 1024) 29 30 struct hisi_ptt_recording { 31 struct auxtrace_record itr; 32 struct perf_pmu *hisi_ptt_pmu; 33 struct evlist *evlist; 34 }; 35 36 static size_t 37 hisi_ptt_info_priv_size(struct auxtrace_record *itr __maybe_unused, 38 struct evlist *evlist __maybe_unused) 39 { 40 return HISI_PTT_AUXTRACE_PRIV_SIZE; 41 } 42 43 static int hisi_ptt_info_fill(struct auxtrace_record *itr, 44 struct perf_session *session, 45 struct perf_record_auxtrace_info *auxtrace_info, 46 size_t priv_size) 47 { 48 struct hisi_ptt_recording *pttr = 49 container_of(itr, struct hisi_ptt_recording, itr); 50 struct perf_pmu *hisi_ptt_pmu = pttr->hisi_ptt_pmu; 51 52 if (priv_size != HISI_PTT_AUXTRACE_PRIV_SIZE) 53 return -EINVAL; 54 55 if (!session->evlist->core.nr_mmaps) 56 return -EINVAL; 57 58 auxtrace_info->type = PERF_AUXTRACE_HISI_PTT; 59 auxtrace_info->priv[0] = hisi_ptt_pmu->type; 60 61 return 0; 62 } 63 64 static int hisi_ptt_set_auxtrace_mmap_page(struct record_opts *opts) 65 { 66 bool privileged = perf_event_paranoid_check(-1); 67 68 if (!opts->full_auxtrace) 69 return 0; 70 71 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) { 72 if (privileged) { 73 opts->auxtrace_mmap_pages = MiB(16) / page_size; 74 } else { 75 opts->auxtrace_mmap_pages = KiB(128) / page_size; 76 if (opts->mmap_pages == UINT_MAX) 77 opts->mmap_pages = KiB(256) / page_size; 78 } 79 } 80 81 /* Validate auxtrace_mmap_pages */ 82 if (opts->auxtrace_mmap_pages) { 83 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size; 84 size_t min_sz = KiB(8); 85 86 if (sz < min_sz || !is_power_of_2(sz)) { 87 pr_err("Invalid mmap size for HISI PTT: must be at least %zuKiB and a power of 2\n", 88 min_sz / 1024); 89 return -EINVAL; 90 } 91 } 92 93 return 0; 94 } 95 96 static int hisi_ptt_recording_options(struct auxtrace_record *itr, 97 struct evlist *evlist, 98 struct record_opts *opts) 99 { 100 struct hisi_ptt_recording *pttr = 101 container_of(itr, struct hisi_ptt_recording, itr); 102 struct perf_pmu *hisi_ptt_pmu = pttr->hisi_ptt_pmu; 103 struct evsel *evsel, *hisi_ptt_evsel = NULL; 104 struct evsel *tracking_evsel; 105 int err; 106 107 pttr->evlist = evlist; 108 evlist__for_each_entry(evlist, evsel) { 109 if (evsel->core.attr.type == hisi_ptt_pmu->type) { 110 if (hisi_ptt_evsel) { 111 pr_err("There may be only one " HISI_PTT_PMU_NAME "x event\n"); 112 return -EINVAL; 113 } 114 evsel->core.attr.freq = 0; 115 evsel->core.attr.sample_period = 1; 116 evsel->needs_auxtrace_mmap = true; 117 hisi_ptt_evsel = evsel; 118 opts->full_auxtrace = true; 119 } 120 } 121 122 err = hisi_ptt_set_auxtrace_mmap_page(opts); 123 if (err) 124 return err; 125 /* 126 * To obtain the auxtrace buffer file descriptor, the auxtrace event 127 * must come first. 128 */ 129 evlist__to_front(evlist, hisi_ptt_evsel); 130 evsel__set_sample_bit(hisi_ptt_evsel, TIME); 131 132 /* Add dummy event to keep tracking */ 133 err = parse_event(evlist, "dummy:u"); 134 if (err) 135 return err; 136 137 tracking_evsel = evlist__last(evlist); 138 evlist__set_tracking_event(evlist, tracking_evsel); 139 140 tracking_evsel->core.attr.freq = 0; 141 tracking_evsel->core.attr.sample_period = 1; 142 evsel__set_sample_bit(tracking_evsel, TIME); 143 144 return 0; 145 } 146 147 static u64 hisi_ptt_reference(struct auxtrace_record *itr __maybe_unused) 148 { 149 return rdtsc(); 150 } 151 152 static void hisi_ptt_recording_free(struct auxtrace_record *itr) 153 { 154 struct hisi_ptt_recording *pttr = 155 container_of(itr, struct hisi_ptt_recording, itr); 156 157 free(pttr); 158 } 159 160 struct auxtrace_record *hisi_ptt_recording_init(int *err, 161 struct perf_pmu *hisi_ptt_pmu) 162 { 163 struct hisi_ptt_recording *pttr; 164 165 if (!hisi_ptt_pmu) { 166 *err = -ENODEV; 167 return NULL; 168 } 169 170 pttr = zalloc(sizeof(*pttr)); 171 if (!pttr) { 172 *err = -ENOMEM; 173 return NULL; 174 } 175 176 pttr->hisi_ptt_pmu = hisi_ptt_pmu; 177 pttr->itr.pmu = hisi_ptt_pmu; 178 pttr->itr.recording_options = hisi_ptt_recording_options; 179 pttr->itr.info_priv_size = hisi_ptt_info_priv_size; 180 pttr->itr.info_fill = hisi_ptt_info_fill; 181 pttr->itr.free = hisi_ptt_recording_free; 182 pttr->itr.reference = hisi_ptt_reference; 183 pttr->itr.read_finish = auxtrace_record__read_finish; 184 pttr->itr.alignment = 0; 185 186 *err = 0; 187 return &pttr->itr; 188 } 189