[PATCH v3 19/19] qapi: introduce x-query-opcount QMP command

[Daniel P . Berrangé]

This is a counterpart to the HMP "info opcount" command. It is being
added with an "x-" prefix because this QMP command is intended as an
ad hoc debugging tool and will thus not be modelled in QAPI as fully
structured data, nor will it have long term guaranteed stability.
The existing HMP command is rewritten to call the QMP command.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 accel/tcg/cpu-exec.c       | 14 ++++++++++++++
 accel/tcg/hmp.c            | 11 ++++++++++-
 accel/tcg/translate-all.c  |  4 ++--
 include/exec/cpu-all.h     |  2 +-
 include/tcg/tcg.h          |  2 +-
 qapi/machine.json          | 13 +++++++++++++
 tcg/tcg.c                  | 10 +++++-----
 tests/qtest/qmp-cmd-test.c |  1 +
 8 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/accel/tcg/cpu-exec.c b/accel/tcg/cpu-exec.c
index 84e10e0f49..623120d246 100644
--- a/accel/tcg/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -1055,4 +1055,18 @@ HumanReadableText *qmp_x_query_jit(Error **errp)
     return human_readable_text_from_str(buf);
 }
 
+HumanReadableText *qmp_x_query_opcount(Error **errp)
+{
+    g_autoptr(GString) buf = g_string_new("");
+
+    if (!tcg_enabled()) {
+        error_setg(errp, "JIT information is only available with accel=tcg");
+        return NULL;
+    }
+
+    dump_opcount_info(buf);
+
+    return human_readable_text_from_str(buf);
+}
+
 #endif /* !CONFIG_USER_ONLY */
diff --git a/accel/tcg/hmp.c b/accel/tcg/hmp.c
index 9d7bcd9185..9b049d1e76 100644
--- a/accel/tcg/hmp.c
+++ b/accel/tcg/hmp.c
@@ -22,7 +22,16 @@ static void hmp_info_jit(Monitor *mon, const QDict *qdict)
 
 static void hmp_info_opcount(Monitor *mon, const QDict *qdict)
 {
-    dump_opcount_info();
+    Error *err = NULL;
+    g_autoptr(HumanReadableText) info = NULL;
+
+    info = qmp_x_query_opcount(&err);
+    if (err) {
+        error_report_err(err);
+        return;
+    }
+
+    monitor_printf(mon, "%s", info->human_readable_text);
 }
 
 static void hmp_tcg_register(void)
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c
index 8f17a91858..bd0bb81d08 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -2118,9 +2118,9 @@ void dump_exec_info(GString *buf)
     tcg_dump_info(buf);
 }
 
-void dump_opcount_info(void)
+void dump_opcount_info(GString *buf)
 {
-    tcg_dump_op_count();
+    tcg_dump_op_count(buf);
 }
 
 #else /* CONFIG_USER_ONLY */
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index d92f6fa7a9..3c8e24292b 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -432,7 +432,7 @@ static inline bool tlb_hit(target_ulong tlb_addr, 
target_ulong addr)
 void dump_drift_info(GString *buf);
 /* accel/tcg/translate-all.c */
 void dump_exec_info(GString *buf);
-void dump_opcount_info(void);
+void dump_opcount_info(GString *buf);
 #endif /* CONFIG_TCG */
 
 #endif /* !CONFIG_USER_ONLY */
diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index 1b56e382b7..cc7f59070b 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -944,7 +944,7 @@ int tcg_check_temp_count(void);
 
 int64_t tcg_cpu_exec_time(void);
 void tcg_dump_info(GString *buf);
-void tcg_dump_op_count(void);
+void tcg_dump_op_count(GString *buf);
 
 #define TCG_CT_CONST  1 /* any constant of register size */
 
diff --git a/qapi/machine.json b/qapi/machine.json
index 568348309c..c735436c47 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1384,6 +1384,19 @@
 { 'command': 'x-query-numa',
   'returns': 'HumanReadableText' }
 
+##
+# @x-query-opcount:
+#
+# Query TCG opcode counters
+#
+# Returns: TCG opcode counters
+#
+# Since: 6.2
+##
+{ 'command': 'x-query-opcount',
+  'returns': 'HumanReadableText',
+  'if': 'CONFIG_TCG' }
+
 ##
 # @x-query-profile:
 #
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 7fcdfd9c0f..d9653990af 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -4115,15 +4115,15 @@ static void tcg_profile_snapshot_table(TCGProfile *prof)
     tcg_profile_snapshot(prof, false, true);
 }
 
-void tcg_dump_op_count(void)
+void tcg_dump_op_count(GString *buf)
 {
     TCGProfile prof = {};
     int i;
 
     tcg_profile_snapshot_table(&prof);
     for (i = 0; i < NB_OPS; i++) {
-        qemu_printf("%s %" PRId64 "\n", tcg_op_defs[i].name,
-                    prof.table_op_count[i]);
+        g_string_append_printf(buf, "%s %" PRId64 "\n", tcg_op_defs[i].name,
+                               prof.table_op_count[i]);
     }
 }
 
@@ -4142,9 +4142,9 @@ int64_t tcg_cpu_exec_time(void)
     return ret;
 }
 #else
-void tcg_dump_op_count(void)
+void tcg_dump_op_count(GString *buf)
 {
-    qemu_printf("[TCG profiler not compiled]\n");
+    g_string_append_printf(buf, "[TCG profiler not compiled]\n");
 }
 
 int64_t tcg_cpu_exec_time(void)
diff --git a/tests/qtest/qmp-cmd-test.c b/tests/qtest/qmp-cmd-test.c
index 6aa628691a..251a14ddf7 100644
--- a/tests/qtest/qmp-cmd-test.c
+++ b/tests/qtest/qmp-cmd-test.c
@@ -53,6 +53,7 @@ static int query_error_class(const char *cmd)
         { "x-query-usb", ERROR_CLASS_GENERIC_ERROR },
         /* Only valid with accel=tcg */
         { "x-query-jit", ERROR_CLASS_GENERIC_ERROR },
+        { "x-query-opcount", ERROR_CLASS_GENERIC_ERROR },
         { NULL, -1 }
     };
     int i;
-- 
2.31.1