xref: /openbmc/qemu/tests/tcg/plugins/bb.c (revision 1b4c136b)
1 /*
2  * Copyright (C) 2018, Emilio G. Cota <cota@braap.org>
3  *
4  * License: GNU GPL, version 2 or later.
5  *   See the COPYING file in the top-level directory.
6  */
7 #include <inttypes.h>
8 #include <assert.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <unistd.h>
12 #include <stdio.h>
13 #include <glib.h>
14 
15 #include <qemu-plugin.h>
16 
17 QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
18 
19 typedef struct {
20     uint64_t bb_count;
21     uint64_t insn_count;
22 } CPUCount;
23 
24 static struct qemu_plugin_scoreboard *counts;
25 static qemu_plugin_u64 bb_count;
26 static qemu_plugin_u64 insn_count;
27 
28 static bool do_inline;
29 /* Dump running CPU total on idle? */
30 static bool idle_report;
31 
gen_one_cpu_report(CPUCount * count,GString * report,unsigned int cpu_index)32 static void gen_one_cpu_report(CPUCount *count, GString *report,
33                                unsigned int cpu_index)
34 {
35     if (count->bb_count) {
36         g_string_append_printf(report, "CPU%d: "
37                                "bb's: %" PRIu64", insns: %" PRIu64 "\n",
38                                cpu_index,
39                                count->bb_count, count->insn_count);
40     }
41 }
42 
plugin_exit(qemu_plugin_id_t id,void * p)43 static void plugin_exit(qemu_plugin_id_t id, void *p)
44 {
45     g_autoptr(GString) report = g_string_new("");
46 
47     for (int i = 0; i < qemu_plugin_num_vcpus(); ++i) {
48         CPUCount *count = qemu_plugin_scoreboard_find(counts, i);
49         gen_one_cpu_report(count, report, i);
50     }
51     g_string_append_printf(report, "Total: "
52                            "bb's: %" PRIu64", insns: %" PRIu64 "\n",
53                            qemu_plugin_u64_sum(bb_count),
54                            qemu_plugin_u64_sum(insn_count));
55     qemu_plugin_outs(report->str);
56     qemu_plugin_scoreboard_free(counts);
57 }
58 
vcpu_idle(qemu_plugin_id_t id,unsigned int cpu_index)59 static void vcpu_idle(qemu_plugin_id_t id, unsigned int cpu_index)
60 {
61     CPUCount *count = qemu_plugin_scoreboard_find(counts, cpu_index);
62     g_autoptr(GString) report = g_string_new("");
63     gen_one_cpu_report(count, report, cpu_index);
64 
65     if (report->len > 0) {
66         g_string_prepend(report, "Idling ");
67         qemu_plugin_outs(report->str);
68     }
69 }
70 
vcpu_tb_exec(unsigned int cpu_index,void * udata)71 static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
72 {
73     CPUCount *count = qemu_plugin_scoreboard_find(counts, cpu_index);
74 
75     uintptr_t n_insns = (uintptr_t)udata;
76     count->insn_count += n_insns;
77     count->bb_count++;
78 }
79 
vcpu_tb_trans(qemu_plugin_id_t id,struct qemu_plugin_tb * tb)80 static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
81 {
82     size_t n_insns = qemu_plugin_tb_n_insns(tb);
83 
84     if (do_inline) {
85         qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
86             tb, QEMU_PLUGIN_INLINE_ADD_U64, bb_count, 1);
87         qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
88             tb, QEMU_PLUGIN_INLINE_ADD_U64, insn_count, n_insns);
89     } else {
90         qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
91                                              QEMU_PLUGIN_CB_NO_REGS,
92                                              (void *)n_insns);
93     }
94 }
95 
qemu_plugin_install(qemu_plugin_id_t id,const qemu_info_t * info,int argc,char ** argv)96 QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
97                                            const qemu_info_t *info,
98                                            int argc, char **argv)
99 {
100     int i;
101 
102     for (i = 0; i < argc; i++) {
103         char *opt = argv[i];
104         g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
105         if (g_strcmp0(tokens[0], "inline") == 0) {
106             if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
107                 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
108                 return -1;
109             }
110         } else if (g_strcmp0(tokens[0], "idle") == 0) {
111             if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &idle_report)) {
112                 fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
113                 return -1;
114             }
115         } else {
116             fprintf(stderr, "option parsing failed: %s\n", opt);
117             return -1;
118         }
119     }
120 
121     counts = qemu_plugin_scoreboard_new(sizeof(CPUCount));
122     bb_count = qemu_plugin_scoreboard_u64_in_struct(counts, CPUCount, bb_count);
123     insn_count = qemu_plugin_scoreboard_u64_in_struct(
124         counts, CPUCount, insn_count);
125 
126     if (idle_report) {
127         qemu_plugin_register_vcpu_idle_cb(id, vcpu_idle);
128     }
129 
130     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
131     qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
132     return 0;
133 }
134