3fb356cc86
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
/*
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* Copyright (C) 2019, Alex Bennée <alex.bennee@linaro.org>
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*
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* License: GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include <inttypes.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <glib.h>
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#include <qemu-plugin.h>
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QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
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static bool do_inline;
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/* Plugins need to take care of their own locking */
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static GMutex lock;
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static GHashTable *hotblocks;
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static guint64 limit = 20;
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/*
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* Counting Structure
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*
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* The internals of the TCG are not exposed to plugins so we can only
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* get the starting PC for each block. We cheat this slightly by
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* xor'ing the number of instructions to the hash to help
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* differentiate.
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*/
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typedef struct {
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uint64_t start_addr;
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uint64_t exec_count;
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int trans_count;
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unsigned long insns;
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} ExecCount;
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static gint cmp_exec_count(gconstpointer a, gconstpointer b)
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{
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ExecCount *ea = (ExecCount *) a;
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ExecCount *eb = (ExecCount *) b;
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return ea->exec_count > eb->exec_count ? -1 : 1;
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}
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static void plugin_exit(qemu_plugin_id_t id, void *p)
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{
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g_autoptr(GString) report = g_string_new("collected ");
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GList *counts, *it;
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int i;
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g_mutex_lock(&lock);
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g_string_append_printf(report, "%d entries in the hash table\n",
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g_hash_table_size(hotblocks));
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counts = g_hash_table_get_values(hotblocks);
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it = g_list_sort(counts, cmp_exec_count);
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if (it) {
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g_string_append_printf(report, "pc, tcount, icount, ecount\n");
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for (i = 0; i < limit && it->next; i++, it = it->next) {
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ExecCount *rec = (ExecCount *) it->data;
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g_string_append_printf(report, "%#016"PRIx64", %d, %ld, %"PRId64"\n",
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rec->start_addr, rec->trans_count,
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rec->insns, rec->exec_count);
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}
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g_list_free(it);
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g_mutex_unlock(&lock);
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}
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qemu_plugin_outs(report->str);
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}
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static void plugin_init(void)
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{
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hotblocks = g_hash_table_new(NULL, g_direct_equal);
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}
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static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
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{
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ExecCount *cnt;
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uint64_t hash = (uint64_t) udata;
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g_mutex_lock(&lock);
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cnt = (ExecCount *) g_hash_table_lookup(hotblocks, (gconstpointer) hash);
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/* should always succeed */
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g_assert(cnt);
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cnt->exec_count++;
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g_mutex_unlock(&lock);
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}
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/*
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* When do_inline we ask the plugin to increment the counter for us.
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* Otherwise a helper is inserted which calls the vcpu_tb_exec
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* callback.
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*/
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static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
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{
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ExecCount *cnt;
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uint64_t pc = qemu_plugin_tb_vaddr(tb);
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unsigned long insns = qemu_plugin_tb_n_insns(tb);
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uint64_t hash = pc ^ insns;
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g_mutex_lock(&lock);
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cnt = (ExecCount *) g_hash_table_lookup(hotblocks, (gconstpointer) hash);
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if (cnt) {
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cnt->trans_count++;
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} else {
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cnt = g_new0(ExecCount, 1);
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cnt->start_addr = pc;
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cnt->trans_count = 1;
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cnt->insns = insns;
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g_hash_table_insert(hotblocks, (gpointer) hash, (gpointer) cnt);
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}
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g_mutex_unlock(&lock);
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if (do_inline) {
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qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
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&cnt->exec_count, 1);
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} else {
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qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
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QEMU_PLUGIN_CB_NO_REGS,
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(void *)hash);
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}
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}
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QEMU_PLUGIN_EXPORT
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int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
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int argc, char **argv)
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{
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if (argc && strcmp(argv[0], "inline") == 0) {
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do_inline = true;
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}
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plugin_init();
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qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
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qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
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return 0;
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}
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