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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
26struct arm_spe_recording {
27 struct auxtrace_record itr;
28 struct perf_pmu *arm_spe_pmu;
29 struct perf_evlist *evlist;
30};
31
32static size_t
33arm_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
39static 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
60static 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
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
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
116
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
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
141static 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
150static 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
158static 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
172struct 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 return &sper->itr;
198}
199
200struct perf_event_attr
201*arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu)
202{
203 struct perf_event_attr *attr;
204
205 attr = zalloc(sizeof(struct perf_event_attr));
206 if (!attr) {
207 pr_err("arm_spe default config cannot allocate a perf_event_attr\n");
208 return NULL;
209 }
210
211
212
213
214
215 if (perf_pmu__scan_file(arm_spe_pmu, "caps/min_interval", "%llu",
216 &attr->sample_period) != 1) {
217 pr_debug("arm_spe driver doesn't advertise a min. interval. Using 4096\n");
218 attr->sample_period = 4096;
219 }
220
221 arm_spe_pmu->selectable = true;
222 arm_spe_pmu->is_uncore = false;
223
224 return attr;
225}
226