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
hisi_ptt_info_priv_size(struct auxtrace_record * itr __maybe_unused,struct evlist * evlist __maybe_unused)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
hisi_ptt_info_fill(struct auxtrace_record * itr,struct perf_session * session,struct perf_record_auxtrace_info * auxtrace_info,size_t priv_size)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
hisi_ptt_set_auxtrace_mmap_page(struct record_opts * opts)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
hisi_ptt_recording_options(struct auxtrace_record * itr,struct evlist * evlist,struct record_opts * opts)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
hisi_ptt_reference(struct auxtrace_record * itr __maybe_unused)148 static u64 hisi_ptt_reference(struct auxtrace_record *itr __maybe_unused)
149 {
150 return rdtsc();
151 }
152
hisi_ptt_recording_free(struct auxtrace_record * itr)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
hisi_ptt_recording_init(int * err,struct perf_pmu * hisi_ptt_pmu)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