1 // SPDX-License-Identifier: GPL-2.0
2 #include <errno.h>
3 #include <memory.h>
4 #include <dwarf-regs.h>
5 #include "../kvm-stat.h"
6 #include "../parse-events.h"
7 #include "../debug.h"
8 #include "../evsel.h"
9 #include "../evlist.h"
10 #include "../pmus.h"
11
12 #define LOONGARCH_EXCEPTION_INT 0
13 #define LOONGARCH_EXCEPTION_PIL 1
14 #define LOONGARCH_EXCEPTION_PIS 2
15 #define LOONGARCH_EXCEPTION_PIF 3
16 #define LOONGARCH_EXCEPTION_PME 4
17 #define LOONGARCH_EXCEPTION_FPD 15
18 #define LOONGARCH_EXCEPTION_SXD 16
19 #define LOONGARCH_EXCEPTION_ASXD 17
20 #define LOONGARCH_EXCEPTION_GSPR 22
21 #define LOONGARCH_EXCEPTION_CPUCFG 100
22 #define LOONGARCH_EXCEPTION_CSR 101
23 #define LOONGARCH_EXCEPTION_IOCSR 102
24 #define LOONGARCH_EXCEPTION_IDLE 103
25 #define LOONGARCH_EXCEPTION_OTHERS 104
26 #define LOONGARCH_EXCEPTION_HVC 23
27
28 #define loongarch_exception_type \
29 {LOONGARCH_EXCEPTION_INT, "Interrupt" }, \
30 {LOONGARCH_EXCEPTION_PIL, "Mem Read" }, \
31 {LOONGARCH_EXCEPTION_PIS, "Mem Store" }, \
32 {LOONGARCH_EXCEPTION_PIF, "Inst Fetch" }, \
33 {LOONGARCH_EXCEPTION_PME, "Mem Modify" }, \
34 {LOONGARCH_EXCEPTION_FPD, "FPU" }, \
35 {LOONGARCH_EXCEPTION_SXD, "LSX" }, \
36 {LOONGARCH_EXCEPTION_ASXD, "LASX" }, \
37 {LOONGARCH_EXCEPTION_GSPR, "Privilege Error" }, \
38 {LOONGARCH_EXCEPTION_HVC, "Hypercall" }, \
39 {LOONGARCH_EXCEPTION_CPUCFG, "CPUCFG" }, \
40 {LOONGARCH_EXCEPTION_CSR, "CSR" }, \
41 {LOONGARCH_EXCEPTION_IOCSR, "IOCSR" }, \
42 {LOONGARCH_EXCEPTION_IDLE, "Idle" }, \
43 {LOONGARCH_EXCEPTION_OTHERS, "Others" }
44
45 define_exit_reasons_table(loongarch_exit_reasons, loongarch_exception_type);
46
47 static const char *kvm_reenter_trace = "kvm:kvm_reenter";
48 static const char * const __kvm_events_tp[] = {
49 "kvm:kvm_enter",
50 "kvm:kvm_reenter",
51 "kvm:kvm_exit",
52 "kvm:kvm_exit_gspr",
53 NULL,
54 };
55
event_begin(struct evsel * evsel,struct perf_sample * sample,struct event_key * key)56 static bool event_begin(struct evsel *evsel,
57 struct perf_sample *sample, struct event_key *key)
58 {
59 return exit_event_begin(evsel, sample, key);
60 }
61
event_end(struct evsel * evsel,struct perf_sample * sample __maybe_unused,struct event_key * key __maybe_unused)62 static bool event_end(struct evsel *evsel,
63 struct perf_sample *sample __maybe_unused,
64 struct event_key *key __maybe_unused)
65 {
66 /*
67 * LoongArch kvm is different with other architectures
68 *
69 * There is kvm:kvm_reenter or kvm:kvm_enter event adjacent with
70 * kvm:kvm_exit event.
71 * kvm:kvm_enter means returning to vmm and then to guest
72 * kvm:kvm_reenter means returning to guest immediately
73 */
74 return evsel__name_is(evsel, kvm_entry_trace(EM_LOONGARCH)) ||
75 evsel__name_is(evsel, kvm_reenter_trace);
76 }
77
event_gspr_get_key(struct evsel * evsel,struct perf_sample * sample,struct event_key * key)78 static void event_gspr_get_key(struct evsel *evsel,
79 struct perf_sample *sample, struct event_key *key)
80 {
81 unsigned int insn;
82
83 key->key = LOONGARCH_EXCEPTION_OTHERS;
84 insn = evsel__intval(evsel, sample, "inst_word");
85
86 switch (insn >> 24) {
87 case 0:
88 /* CPUCFG inst trap */
89 if ((insn >> 10) == 0x1b)
90 key->key = LOONGARCH_EXCEPTION_CPUCFG;
91 break;
92 case 4:
93 /* CSR inst trap */
94 key->key = LOONGARCH_EXCEPTION_CSR;
95 break;
96 case 6:
97 /* IOCSR inst trap */
98 if ((insn >> 15) == 0xc90)
99 key->key = LOONGARCH_EXCEPTION_IOCSR;
100 else if ((insn >> 15) == 0xc91)
101 /* Idle inst trap */
102 key->key = LOONGARCH_EXCEPTION_IDLE;
103 break;
104 default:
105 key->key = LOONGARCH_EXCEPTION_OTHERS;
106 break;
107 }
108 }
109
110 static const struct child_event_ops child_events[] = {
111 { .name = "kvm:kvm_exit_gspr", .get_key = event_gspr_get_key },
112 { NULL, NULL },
113 };
114
115 static const struct kvm_events_ops exit_events = {
116 .is_begin_event = event_begin,
117 .is_end_event = event_end,
118 .child_ops = child_events,
119 .decode_key = exit_event_decode_key,
120 .name = "VM-EXIT"
121 };
122
123 static const struct kvm_reg_events_ops __kvm_reg_events_ops[] = {
124 { .name = "vmexit", .ops = &exit_events, },
125 { NULL, NULL },
126 };
127
128 static const char * const __kvm_skip_events[] = {
129 NULL,
130 };
131
__cpu_isa_init_loongarch(struct perf_kvm_stat * kvm)132 int __cpu_isa_init_loongarch(struct perf_kvm_stat *kvm)
133 {
134 kvm->exit_reasons_isa = "loongarch64";
135 kvm->exit_reasons = loongarch_exit_reasons;
136 return 0;
137 }
138
__kvm_events_tp_loongarch(void)139 const char * const *__kvm_events_tp_loongarch(void)
140 {
141 return __kvm_events_tp;
142 }
143
__kvm_reg_events_ops_loongarch(void)144 const struct kvm_reg_events_ops *__kvm_reg_events_ops_loongarch(void)
145 {
146 return __kvm_reg_events_ops;
147 }
148
__kvm_skip_events_loongarch(void)149 const char * const *__kvm_skip_events_loongarch(void)
150 {
151 return __kvm_skip_events;
152 }
153