This source file includes following definitions.
- arm_spe_info_priv_size
- arm_spe_info_fill
- arm_spe_recording_options
- arm_spe_reference
- arm_spe_recording_free
- arm_spe_read_finish
- arm_spe_recording_init
- arm_spe_pmu_default_config
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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 <linux/zalloc.h>
12 #include <time.h>
13
14 #include "../../util/cpumap.h"
15 #include "../../util/event.h"
16 #include "../../util/evsel.h"
17 #include "../../util/evlist.h"
18 #include "../../util/session.h"
19 #include <internal/lib.h>
20 #include "../../util/pmu.h"
21 #include "../../util/debug.h"
22 #include "../../util/auxtrace.h"
23 #include "../../util/record.h"
24 #include "../../util/arm-spe.h"
25
26 #define KiB(x) ((x) * 1024)
27 #define MiB(x) ((x) * 1024 * 1024)
28
29 struct arm_spe_recording {
30 struct auxtrace_record itr;
31 struct perf_pmu *arm_spe_pmu;
32 struct evlist *evlist;
33 };
34
35 static size_t
36 arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
37 struct evlist *evlist __maybe_unused)
38 {
39 return ARM_SPE_AUXTRACE_PRIV_SIZE;
40 }
41
42 static int arm_spe_info_fill(struct auxtrace_record *itr,
43 struct perf_session *session,
44 struct perf_record_auxtrace_info *auxtrace_info,
45 size_t priv_size)
46 {
47 struct arm_spe_recording *sper =
48 container_of(itr, struct arm_spe_recording, itr);
49 struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
50
51 if (priv_size != ARM_SPE_AUXTRACE_PRIV_SIZE)
52 return -EINVAL;
53
54 if (!session->evlist->core.nr_mmaps)
55 return -EINVAL;
56
57 auxtrace_info->type = PERF_AUXTRACE_ARM_SPE;
58 auxtrace_info->priv[ARM_SPE_PMU_TYPE] = arm_spe_pmu->type;
59
60 return 0;
61 }
62
63 static int arm_spe_recording_options(struct auxtrace_record *itr,
64 struct evlist *evlist,
65 struct record_opts *opts)
66 {
67 struct arm_spe_recording *sper =
68 container_of(itr, struct arm_spe_recording, itr);
69 struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
70 struct evsel *evsel, *arm_spe_evsel = NULL;
71 bool privileged = perf_event_paranoid_check(-1);
72 struct evsel *tracking_evsel;
73 int err;
74
75 sper->evlist = evlist;
76
77 evlist__for_each_entry(evlist, evsel) {
78 if (evsel->core.attr.type == arm_spe_pmu->type) {
79 if (arm_spe_evsel) {
80 pr_err("There may be only one " ARM_SPE_PMU_NAME "x event\n");
81 return -EINVAL;
82 }
83 evsel->core.attr.freq = 0;
84 evsel->core.attr.sample_period = 1;
85 arm_spe_evsel = evsel;
86 opts->full_auxtrace = true;
87 }
88 }
89
90 if (!opts->full_auxtrace)
91 return 0;
92
93
94 if (opts->full_auxtrace && !opts->auxtrace_mmap_pages) {
95 if (privileged) {
96 opts->auxtrace_mmap_pages = MiB(4) / page_size;
97 } else {
98 opts->auxtrace_mmap_pages = KiB(128) / page_size;
99 if (opts->mmap_pages == UINT_MAX)
100 opts->mmap_pages = KiB(256) / page_size;
101 }
102 }
103
104
105 if (opts->auxtrace_mmap_pages) {
106 size_t sz = opts->auxtrace_mmap_pages * (size_t)page_size;
107 size_t min_sz = KiB(8);
108
109 if (sz < min_sz || !is_power_of_2(sz)) {
110 pr_err("Invalid mmap size for ARM SPE: must be at least %zuKiB and a power of 2\n",
111 min_sz / 1024);
112 return -EINVAL;
113 }
114 }
115
116
117
118
119
120
121 perf_evlist__to_front(evlist, arm_spe_evsel);
122
123 perf_evsel__set_sample_bit(arm_spe_evsel, CPU);
124 perf_evsel__set_sample_bit(arm_spe_evsel, TIME);
125 perf_evsel__set_sample_bit(arm_spe_evsel, TID);
126
127
128 err = parse_events(evlist, "dummy:u", NULL);
129 if (err)
130 return err;
131
132 tracking_evsel = evlist__last(evlist);
133 perf_evlist__set_tracking_event(evlist, tracking_evsel);
134
135 tracking_evsel->core.attr.freq = 0;
136 tracking_evsel->core.attr.sample_period = 1;
137 perf_evsel__set_sample_bit(tracking_evsel, TIME);
138 perf_evsel__set_sample_bit(tracking_evsel, CPU);
139 perf_evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK);
140
141 return 0;
142 }
143
144 static u64 arm_spe_reference(struct auxtrace_record *itr __maybe_unused)
145 {
146 struct timespec ts;
147
148 clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
149
150 return ts.tv_sec ^ ts.tv_nsec;
151 }
152
153 static void arm_spe_recording_free(struct auxtrace_record *itr)
154 {
155 struct arm_spe_recording *sper =
156 container_of(itr, struct arm_spe_recording, itr);
157
158 free(sper);
159 }
160
161 static int arm_spe_read_finish(struct auxtrace_record *itr, int idx)
162 {
163 struct arm_spe_recording *sper =
164 container_of(itr, struct arm_spe_recording, itr);
165 struct evsel *evsel;
166
167 evlist__for_each_entry(sper->evlist, evsel) {
168 if (evsel->core.attr.type == sper->arm_spe_pmu->type) {
169 if (evsel->disabled)
170 return 0;
171 return perf_evlist__enable_event_idx(sper->evlist,
172 evsel, idx);
173 }
174 }
175 return -EINVAL;
176 }
177
178 struct auxtrace_record *arm_spe_recording_init(int *err,
179 struct perf_pmu *arm_spe_pmu)
180 {
181 struct arm_spe_recording *sper;
182
183 if (!arm_spe_pmu) {
184 *err = -ENODEV;
185 return NULL;
186 }
187
188 sper = zalloc(sizeof(struct arm_spe_recording));
189 if (!sper) {
190 *err = -ENOMEM;
191 return NULL;
192 }
193
194 sper->arm_spe_pmu = arm_spe_pmu;
195 sper->itr.recording_options = arm_spe_recording_options;
196 sper->itr.info_priv_size = arm_spe_info_priv_size;
197 sper->itr.info_fill = arm_spe_info_fill;
198 sper->itr.free = arm_spe_recording_free;
199 sper->itr.reference = arm_spe_reference;
200 sper->itr.read_finish = arm_spe_read_finish;
201 sper->itr.alignment = 0;
202
203 *err = 0;
204 return &sper->itr;
205 }
206
207 struct perf_event_attr
208 *arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu)
209 {
210 struct perf_event_attr *attr;
211
212 attr = zalloc(sizeof(struct perf_event_attr));
213 if (!attr) {
214 pr_err("arm_spe default config cannot allocate a perf_event_attr\n");
215 return NULL;
216 }
217
218
219
220
221
222 if (perf_pmu__scan_file(arm_spe_pmu, "caps/min_interval", "%llu",
223 &attr->sample_period) != 1) {
224 pr_debug("arm_spe driver doesn't advertise a min. interval. Using 4096\n");
225 attr->sample_period = 4096;
226 }
227
228 arm_spe_pmu->selectable = true;
229 arm_spe_pmu->is_uncore = false;
230
231 return attr;
232 }