1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include "util/kvm-stat.h"
#include "util/parse-events.h"
#include "util/debug.h"
#include "util/evsel.h"
#include "util/evlist.h"
#include "book3s_hv_exits.h"
#include "book3s_hcalls.h"
#define NR_TPS 4
const char *vcpu_id_str = "vcpu_id";
const int decode_str_len = 40;
const char *kvm_entry_trace = "kvm_hv:kvm_guest_enter";
const char *kvm_exit_trace = "kvm_hv:kvm_guest_exit";
define_exit_reasons_table(hv_exit_reasons, kvm_trace_symbol_exit);
define_exit_reasons_table(hcall_reasons, kvm_trace_symbol_hcall);
/* Tracepoints specific to ppc_book3s_hv */
const char *ppc_book3s_hv_kvm_tp[] = {
"kvm_hv:kvm_guest_enter",
"kvm_hv:kvm_guest_exit",
"kvm_hv:kvm_hcall_enter",
"kvm_hv:kvm_hcall_exit",
NULL,
};
/* 1 extra placeholder for NULL */
const char *kvm_events_tp[NR_TPS + 1];
const char *kvm_exit_reason;
static void hcall_event_get_key(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
key->info = 0;
key->key = perf_evsel__intval(evsel, sample, "req");
}
static const char *get_hcall_exit_reason(u64 exit_code)
{
struct exit_reasons_table *tbl = hcall_reasons;
while (tbl->reason != NULL) {
if (tbl->exit_code == exit_code)
return tbl->reason;
tbl++;
}
pr_debug("Unknown hcall code: %lld\n",
(unsigned long long)exit_code);
return "UNKNOWN";
}
static bool hcall_event_end(struct perf_evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
return (!strcmp(evsel->name, kvm_events_tp[3]));
}
static bool hcall_event_begin(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
if (!strcmp(evsel->name, kvm_events_tp[2])) {
hcall_event_get_key(evsel, sample, key);
return true;
}
return false;
}
static void hcall_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
struct event_key *key,
char *decode)
{
const char *hcall_reason = get_hcall_exit_reason(key->key);
scnprintf(decode, decode_str_len, "%s", hcall_reason);
}
static struct kvm_events_ops hcall_events = {
.is_begin_event = hcall_event_begin,
.is_end_event = hcall_event_end,
.decode_key = hcall_event_decode_key,
.name = "HCALL-EVENT",
};
static struct kvm_events_ops exit_events = {
.is_begin_event = exit_event_begin,
.is_end_event = exit_event_end,
.decode_key = exit_event_decode_key,
.name = "VM-EXIT"
};
struct kvm_reg_events_ops kvm_reg_events_ops[] = {
{ .name = "vmexit", .ops = &exit_events },
{ .name = "hcall", .ops = &hcall_events },
{ NULL, NULL },
};
const char * const kvm_skip_events[] = {
NULL,
};
static int is_tracepoint_available(const char *str, struct perf_evlist *evlist)
{
struct parse_events_error err;
int ret;
err.str = NULL;
ret = parse_events(evlist, str, &err);
if (err.str)
pr_err("%s : %s\n", str, err.str);
return ret;
}
static int ppc__setup_book3s_hv(struct perf_kvm_stat *kvm,
struct perf_evlist *evlist)
{
const char **events_ptr;
int i, nr_tp = 0, err = -1;
/* Check for book3s_hv tracepoints */
for (events_ptr = ppc_book3s_hv_kvm_tp; *events_ptr; events_ptr++) {
err = is_tracepoint_available(*events_ptr, evlist);
if (err)
return -1;
nr_tp++;
}
for (i = 0; i < nr_tp; i++)
kvm_events_tp[i] = ppc_book3s_hv_kvm_tp[i];
kvm_events_tp[i] = NULL;
kvm_exit_reason = "trap";
kvm->exit_reasons = hv_exit_reasons;
kvm->exit_reasons_isa = "HV";
return 0;
}
/* Wrapper to setup kvm tracepoints */
static int ppc__setup_kvm_tp(struct perf_kvm_stat *kvm)
{
struct perf_evlist *evlist = perf_evlist__new();
if (evlist == NULL)
return -ENOMEM;
/* Right now, only supported on book3s_hv */
return ppc__setup_book3s_hv(kvm, evlist);
}
int setup_kvm_events_tp(struct perf_kvm_stat *kvm)
{
return ppc__setup_kvm_tp(kvm);
}
int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
{
int ret;
ret = ppc__setup_kvm_tp(kvm);
if (ret) {
kvm->exit_reasons = NULL;
kvm->exit_reasons_isa = NULL;
}
return ret;
}
|
