mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-09-06 18:05:37 +00:00
![Alex Bennée](/assets/img/avatar_default.png)
This is a very simple versioning API which allows the plugin infrastructure to check the API a plugin was built against. We also expose a min/cur API version to the plugin via the info block in case it wants to avoid using old deprecated APIs in the future. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Robert Foley <robert.foley@linaro.org>
146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*
|
|
* Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org>
|
|
*
|
|
* License: GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*/
|
|
#include <inttypes.h>
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <inttypes.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <glib.h>
|
|
|
|
#include <qemu-plugin.h>
|
|
|
|
QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
|
|
|
|
static bool do_inline;
|
|
|
|
/* Plugins need to take care of their own locking */
|
|
static GMutex lock;
|
|
static GHashTable *hotblocks;
|
|
static guint64 limit = 20;
|
|
|
|
/*
|
|
* Counting Structure
|
|
*
|
|
* The internals of the TCG are not exposed to plugins so we can only
|
|
* get the starting PC for each block. We cheat this slightly by
|
|
* xor'ing the number of instructions to the hash to help
|
|
* differentiate.
|
|
*/
|
|
typedef struct {
|
|
uint64_t start_addr;
|
|
uint64_t exec_count;
|
|
int trans_count;
|
|
unsigned long insns;
|
|
} ExecCount;
|
|
|
|
static gint cmp_exec_count(gconstpointer a, gconstpointer b)
|
|
{
|
|
ExecCount *ea = (ExecCount *) a;
|
|
ExecCount *eb = (ExecCount *) b;
|
|
return ea->exec_count > eb->exec_count ? -1 : 1;
|
|
}
|
|
|
|
static void plugin_exit(qemu_plugin_id_t id, void *p)
|
|
{
|
|
g_autoptr(GString) report = g_string_new("collected ");
|
|
GList *counts, *it;
|
|
int i;
|
|
|
|
g_mutex_lock(&lock);
|
|
g_string_append_printf(report, "%d entries in the hash table\n",
|
|
g_hash_table_size(hotblocks));
|
|
counts = g_hash_table_get_values(hotblocks);
|
|
it = g_list_sort(counts, cmp_exec_count);
|
|
|
|
if (it) {
|
|
g_string_append_printf(report, "pc, tcount, icount, ecount\n");
|
|
|
|
for (i = 0; i < limit && it->next; i++, it = it->next) {
|
|
ExecCount *rec = (ExecCount *) it->data;
|
|
g_string_append_printf(report, "%#016"PRIx64", %d, %ld, %"PRId64"\n",
|
|
rec->start_addr, rec->trans_count,
|
|
rec->insns, rec->exec_count);
|
|
}
|
|
|
|
g_list_free(it);
|
|
g_mutex_unlock(&lock);
|
|
}
|
|
|
|
qemu_plugin_outs(report->str);
|
|
}
|
|
|
|
static void plugin_init(void)
|
|
{
|
|
hotblocks = g_hash_table_new(NULL, g_direct_equal);
|
|
}
|
|
|
|
static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
|
|
{
|
|
ExecCount *cnt;
|
|
uint64_t hash = (uint64_t) udata;
|
|
|
|
g_mutex_lock(&lock);
|
|
cnt = (ExecCount *) g_hash_table_lookup(hotblocks, (gconstpointer) hash);
|
|
/* should always succeed */
|
|
g_assert(cnt);
|
|
cnt->exec_count++;
|
|
g_mutex_unlock(&lock);
|
|
}
|
|
|
|
/*
|
|
* When do_inline we ask the plugin to increment the counter for us.
|
|
* Otherwise a helper is inserted which calls the vcpu_tb_exec
|
|
* callback.
|
|
*/
|
|
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
|
|
{
|
|
ExecCount *cnt;
|
|
uint64_t pc = qemu_plugin_tb_vaddr(tb);
|
|
unsigned long insns = qemu_plugin_tb_n_insns(tb);
|
|
uint64_t hash = pc ^ insns;
|
|
|
|
g_mutex_lock(&lock);
|
|
cnt = (ExecCount *) g_hash_table_lookup(hotblocks, (gconstpointer) hash);
|
|
if (cnt) {
|
|
cnt->trans_count++;
|
|
} else {
|
|
cnt = g_new0(ExecCount, 1);
|
|
cnt->start_addr = pc;
|
|
cnt->trans_count = 1;
|
|
cnt->insns = insns;
|
|
g_hash_table_insert(hotblocks, (gpointer) hash, (gpointer) cnt);
|
|
}
|
|
|
|
g_mutex_unlock(&lock);
|
|
|
|
if (do_inline) {
|
|
qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
|
|
&cnt->exec_count, 1);
|
|
} else {
|
|
qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
|
|
QEMU_PLUGIN_CB_NO_REGS,
|
|
(void *)hash);
|
|
}
|
|
}
|
|
|
|
QEMU_PLUGIN_EXPORT
|
|
int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
|
|
int argc, char **argv)
|
|
{
|
|
if (argc && strcmp(argv[0], "inline") == 0) {
|
|
do_inline = true;
|
|
}
|
|
|
|
plugin_init();
|
|
|
|
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
|
|
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
|
|
return 0;
|
|
}
|