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Linux/tools/perf/arch/arm64/util/arm-spe.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * Arm Statistical Profiling Extensions (SPE) support
  4  * Copyright (c) 2017-2018, Arm 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 <time.h>
 12 
 13 #include "../../util/cpumap.h"
 14 #include "../../util/evsel.h"
 15 #include "../../util/evlist.h"
 16 #include "../../util/session.h"
 17 #include "../../util/util.h"
 18 #include "../../util/pmu.h"
 19 #include "../../util/debug.h"
 20 #include "../../util/auxtrace.h"
 21 #include "../../util/arm-spe.h"
 22 
 23 #define KiB(x) ((x) * 1024)
 24 #define MiB(x) ((x) * 1024 * 1024)
 25 
 26 struct arm_spe_recording {
 27         struct auxtrace_record          itr;
 28         struct perf_pmu                 *arm_spe_pmu;
 29         struct perf_evlist              *evlist;
 30 };
 31 
 32 static size_t
 33 arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
 34                        struct perf_evlist *evlist __maybe_unused)
 35 {
 36         return ARM_SPE_AUXTRACE_PRIV_SIZE;
 37 }
 38 
 39 static int arm_spe_info_fill(struct auxtrace_record *itr,
 40                              struct perf_session *session,
 41                              struct auxtrace_info_event *auxtrace_info,
 42                              size_t priv_size)
 43 {
 44         struct arm_spe_recording *sper =
 45                         container_of(itr, struct arm_spe_recording, itr);
 46         struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
 47 
 48         if (priv_size != ARM_SPE_AUXTRACE_PRIV_SIZE)
 49                 return -EINVAL;
 50 
 51         if (!session->evlist->nr_mmaps)
 52                 return -EINVAL;
 53 
 54         auxtrace_info->type = PERF_AUXTRACE_ARM_SPE;
 55         auxtrace_info->priv[ARM_SPE_PMU_TYPE] = arm_spe_pmu->type;
 56 
 57         return 0;
 58 }
 59 
 60 static int arm_spe_recording_options(struct auxtrace_record *itr,
 61                                      struct perf_evlist *evlist,
 62                                      struct record_opts *opts)
 63 {
 64         struct arm_spe_recording *sper =
 65                         container_of(itr, struct arm_spe_recording, itr);
 66         struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
 67         struct perf_evsel *evsel, *arm_spe_evsel = NULL;
 68         bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
 69         struct perf_evsel *tracking_evsel;
 70         int err;
 71 
 72         sper->evlist = evlist;
 73 
 74         evlist__for_each_entry(evlist, evsel) {
 75                 if (evsel->attr.type == arm_spe_pmu->type) {
 76                         if (arm_spe_evsel) {
 77                                 pr_err("There may be only one " ARM_SPE_PMU_NAME "x event\n");
 78                                 return -EINVAL;
 79                         }
 80                         evsel->attr.freq = 0;
 81                         evsel->attr.sample_period = 1;
 82                         arm_spe_evsel = evsel;
 83                         opts->full_auxtrace = true;
 84                 }
 85         }
 86 
 87         if (!opts->full_auxtrace)
 88                 return 0;
 89 
 90         /* We are in full trace mode but '-m,xyz' wasn't specified */
 91         if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
 92                 if (privileged) {
 93                         opts->auxtrace_mmap_pages = MiB(4) / page_size;
 94                 } else {
 95                         opts->auxtrace_mmap_pages = KiB(128) / page_size;
 96                         if (opts->mmap_pages == UINT_MAX)
 97                                 opts->mmap_pages = KiB(256) / page_size;
 98                 }
 99         }
100 
101         /* Validate auxtrace_mmap_pages */
102         if (opts->auxtrace_mmap_pages) {
103                 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
104                 size_t min_sz = KiB(8);
105 
106                 if (sz < min_sz || !is_power_of_2(sz)) {
107                         pr_err("Invalid mmap size for ARM SPE: must be at least %zuKiB and a power of 2\n",
108                                min_sz / 1024);
109                         return -EINVAL;
110                 }
111         }
112 
113 
114         /*
115          * To obtain the auxtrace buffer file descriptor, the auxtrace event
116          * must come first.
117          */
118         perf_evlist__to_front(evlist, arm_spe_evsel);
119 
120         perf_evsel__set_sample_bit(arm_spe_evsel, CPU);
121         perf_evsel__set_sample_bit(arm_spe_evsel, TIME);
122         perf_evsel__set_sample_bit(arm_spe_evsel, TID);
123 
124         /* Add dummy event to keep tracking */
125         err = parse_events(evlist, "dummy:u", NULL);
126         if (err)
127                 return err;
128 
129         tracking_evsel = perf_evlist__last(evlist);
130         perf_evlist__set_tracking_event(evlist, tracking_evsel);
131 
132         tracking_evsel->attr.freq = 0;
133         tracking_evsel->attr.sample_period = 1;
134         perf_evsel__set_sample_bit(tracking_evsel, TIME);
135         perf_evsel__set_sample_bit(tracking_evsel, CPU);
136         perf_evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK);
137 
138         return 0;
139 }
140 
141 static u64 arm_spe_reference(struct auxtrace_record *itr __maybe_unused)
142 {
143         struct timespec ts;
144 
145         clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
146 
147         return ts.tv_sec ^ ts.tv_nsec;
148 }
149 
150 static void arm_spe_recording_free(struct auxtrace_record *itr)
151 {
152         struct arm_spe_recording *sper =
153                         container_of(itr, struct arm_spe_recording, itr);
154 
155         free(sper);
156 }
157 
158 static int arm_spe_read_finish(struct auxtrace_record *itr, int idx)
159 {
160         struct arm_spe_recording *sper =
161                         container_of(itr, struct arm_spe_recording, itr);
162         struct perf_evsel *evsel;
163 
164         evlist__for_each_entry(sper->evlist, evsel) {
165                 if (evsel->attr.type == sper->arm_spe_pmu->type)
166                         return perf_evlist__enable_event_idx(sper->evlist,
167                                                              evsel, idx);
168         }
169         return -EINVAL;
170 }
171 
172 struct auxtrace_record *arm_spe_recording_init(int *err,
173                                                struct perf_pmu *arm_spe_pmu)
174 {
175         struct arm_spe_recording *sper;
176 
177         if (!arm_spe_pmu) {
178                 *err = -ENODEV;
179                 return NULL;
180         }
181 
182         sper = zalloc(sizeof(struct arm_spe_recording));
183         if (!sper) {
184                 *err = -ENOMEM;
185                 return NULL;
186         }
187 
188         sper->arm_spe_pmu = arm_spe_pmu;
189         sper->itr.recording_options = arm_spe_recording_options;
190         sper->itr.info_priv_size = arm_spe_info_priv_size;
191         sper->itr.info_fill = arm_spe_info_fill;
192         sper->itr.free = arm_spe_recording_free;
193         sper->itr.reference = arm_spe_reference;
194         sper->itr.read_finish = arm_spe_read_finish;
195         sper->itr.alignment = 0;
196 
197         *err = 0;
198         return &sper->itr;
199 }
200 
201 struct perf_event_attr
202 *arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu)
203 {
204         struct perf_event_attr *attr;
205 
206         attr = zalloc(sizeof(struct perf_event_attr));
207         if (!attr) {
208                 pr_err("arm_spe default config cannot allocate a perf_event_attr\n");
209                 return NULL;
210         }
211 
212         /*
213          * If kernel driver doesn't advertise a minimum,
214          * use max allowable by PMSIDR_EL1.INTERVAL
215          */
216         if (perf_pmu__scan_file(arm_spe_pmu, "caps/min_interval", "%llu",
217                                   &attr->sample_period) != 1) {
218                 pr_debug("arm_spe driver doesn't advertise a min. interval. Using 4096\n");
219                 attr->sample_period = 4096;
220         }
221 
222         arm_spe_pmu->selectable = true;
223         arm_spe_pmu->is_uncore = false;
224 
225         return attr;
226 }
227 

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