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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
29struct arm_spe_recording {
30 struct auxtrace_record itr;
31 struct perf_pmu *arm_spe_pmu;
32 struct evlist *evlist;
33};
34
35static size_t
36arm_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
42static 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
63static 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 evsel__set_sample_bit(arm_spe_evsel, CPU);
124 evsel__set_sample_bit(arm_spe_evsel, TIME);
125 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 evsel__set_sample_bit(tracking_evsel, TIME);
138 evsel__set_sample_bit(tracking_evsel, CPU);
139 evsel__reset_sample_bit(tracking_evsel, BRANCH_STACK);
140
141 return 0;
142}
143
144static 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
153static 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
161struct auxtrace_record *arm_spe_recording_init(int *err,
162 struct perf_pmu *arm_spe_pmu)
163{
164 struct arm_spe_recording *sper;
165
166 if (!arm_spe_pmu) {
167 *err = -ENODEV;
168 return NULL;
169 }
170
171 sper = zalloc(sizeof(struct arm_spe_recording));
172 if (!sper) {
173 *err = -ENOMEM;
174 return NULL;
175 }
176
177 sper->arm_spe_pmu = arm_spe_pmu;
178 sper->itr.pmu = arm_spe_pmu;
179 sper->itr.recording_options = arm_spe_recording_options;
180 sper->itr.info_priv_size = arm_spe_info_priv_size;
181 sper->itr.info_fill = arm_spe_info_fill;
182 sper->itr.free = arm_spe_recording_free;
183 sper->itr.reference = arm_spe_reference;
184 sper->itr.read_finish = auxtrace_record__read_finish;
185 sper->itr.alignment = 0;
186
187 *err = 0;
188 return &sper->itr;
189}
190
191struct perf_event_attr
192*arm_spe_pmu_default_config(struct perf_pmu *arm_spe_pmu)
193{
194 struct perf_event_attr *attr;
195
196 attr = zalloc(sizeof(struct perf_event_attr));
197 if (!attr) {
198 pr_err("arm_spe default config cannot allocate a perf_event_attr\n");
199 return NULL;
200 }
201
202
203
204
205
206 if (perf_pmu__scan_file(arm_spe_pmu, "caps/min_interval", "%llu",
207 &attr->sample_period) != 1) {
208 pr_debug("arm_spe driver doesn't advertise a min. interval. Using 4096\n");
209 attr->sample_period = 4096;
210 }
211
212 arm_spe_pmu->selectable = true;
213 arm_spe_pmu->is_uncore = false;
214
215 return attr;
216}
217
