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