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/*
* Generate basic block vectors for use with the SimPoint analysis tool.
* SimPoint: https://cseweb.ucsd.edu/~calder/simpoint/
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <stdio.h>
#include <glib.h>
#include <qemu-plugin.h>
typedef struct Bb {
uint64_t vaddr;
struct qemu_plugin_scoreboard *count;
unsigned int index;
} Bb;
typedef struct Vcpu {
uint64_t count;
FILE *file;
} Vcpu;
QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
static GHashTable *bbs;
static GRWLock bbs_lock;
static char *filename;
static struct qemu_plugin_scoreboard *vcpus;
static uint64_t interval = 100000000;
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
for (int i = 0; i < qemu_plugin_num_vcpus(); i++) {
fclose(((Vcpu *)qemu_plugin_scoreboard_find(vcpus, i))->file);
}
g_hash_table_unref(bbs);
g_free(filename);
qemu_plugin_scoreboard_free(vcpus);
}
static void free_bb(void *data)
{
qemu_plugin_scoreboard_free(((Bb *)data)->count);
g_free(data);
}
static qemu_plugin_u64 count_u64(void)
{
return qemu_plugin_scoreboard_u64_in_struct(vcpus, Vcpu, count);
}
static qemu_plugin_u64 bb_count_u64(Bb *bb)
{
return qemu_plugin_scoreboard_u64(bb->count);
}
static void vcpu_init(qemu_plugin_id_t id, unsigned int vcpu_index)
{
g_autofree gchar *vcpu_filename = NULL;
Vcpu *vcpu = qemu_plugin_scoreboard_find(vcpus, vcpu_index);
vcpu_filename = g_strdup_printf("%s.%u.bb", filename, vcpu_index);
vcpu->file = fopen(vcpu_filename, "w");
}
static void vcpu_interval_exec(unsigned int vcpu_index, void *udata)
{
Vcpu *vcpu = qemu_plugin_scoreboard_find(vcpus, vcpu_index);
GHashTableIter iter;
void *value;
if (!vcpu->file) {
return;
}
vcpu->count -= interval;
fputc('T', vcpu->file);
g_rw_lock_reader_lock(&bbs_lock);
g_hash_table_iter_init(&iter, bbs);
while (g_hash_table_iter_next(&iter, NULL, &value)) {
Bb *bb = value;
uint64_t bb_count = qemu_plugin_u64_get(bb_count_u64(bb), vcpu_index);
if (!bb_count) {
continue;
}
fprintf(vcpu->file, ":%u:%" PRIu64 " ", bb->index, bb_count);
qemu_plugin_u64_set(bb_count_u64(bb), vcpu_index, 0);
}
g_rw_lock_reader_unlock(&bbs_lock);
fputc('\n', vcpu->file);
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
uint64_t n_insns = qemu_plugin_tb_n_insns(tb);
uint64_t vaddr = qemu_plugin_tb_vaddr(tb);
Bb *bb;
g_rw_lock_writer_lock(&bbs_lock);
bb = g_hash_table_lookup(bbs, &vaddr);
if (!bb) {
bb = g_new(Bb, 1);
bb->vaddr = vaddr;
bb->count = qemu_plugin_scoreboard_new(sizeof(uint64_t));
bb->index = g_hash_table_size(bbs);
g_hash_table_replace(bbs, &bb->vaddr, bb);
}
g_rw_lock_writer_unlock(&bbs_lock);
qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
tb, QEMU_PLUGIN_INLINE_ADD_U64, count_u64(), n_insns);
qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
tb, QEMU_PLUGIN_INLINE_ADD_U64, bb_count_u64(bb), n_insns);
qemu_plugin_register_vcpu_tb_exec_cond_cb(
tb, vcpu_interval_exec, QEMU_PLUGIN_CB_NO_REGS,
QEMU_PLUGIN_COND_GE, count_u64(), interval, NULL);
}
QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
const qemu_info_t *info,
int argc, char **argv)
{
for (int i = 0; i < argc; i++) {
char *opt = argv[i];
g_auto(GStrv) tokens = g_strsplit(opt, "=", 2);
if (g_strcmp0(tokens[0], "interval") == 0) {
interval = g_ascii_strtoull(tokens[1], NULL, 10);
} else if (g_strcmp0(tokens[0], "outfile") == 0) {
filename = tokens[1];
tokens[1] = NULL;
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
if (!filename) {
fputs("outfile unspecified\n", stderr);
return -1;
}
bbs = g_hash_table_new_full(g_int64_hash, g_int64_equal, NULL, free_bb);
vcpus = qemu_plugin_scoreboard_new(sizeof(Vcpu));
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
qemu_plugin_register_vcpu_init_cb(id, vcpu_init);
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
return 0;
}
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