[PATCH 03/12] tests/plugin: add test plugin for inline operations

[Pierrick Bouvier <pierrick.bouvier@linaro.org>]

For now, it simply performs instruction, bb and mem count, and ensure
that inline vs callback versions have the same result. Later, we'll
extend it when new inline operations are added.

Use existing plugins to test everything works is a bit cumbersome, as
different events are treated in different plugins. Thus, this new one.

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 tests/plugin/inline.c    | 183 +++++++++++++++++++++++++++++++++++++++
 tests/plugin/meson.build |   2 +-
 2 files changed, 184 insertions(+), 1 deletion(-)
 create mode 100644 tests/plugin/inline.c

diff --git a/tests/plugin/inline.c b/tests/plugin/inline.c
new file mode 100644
index 00000000000..6114ebca545
--- /dev/null
+++ b/tests/plugin/inline.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) 2023, Pierrick Bouvier <pierrick.bouvier@linaro.org>
+ *
+ * Demonstrates and tests usage of inline ops.
+ *
+ * License: GNU GPL, version 2 or later.
+ *   See the COPYING file in the top-level directory.
+ */
+
+#include <glib.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include <qemu-plugin.h>
+
+#define MAX_CPUS 8
+
+static uint64_t count_tb;
+static uint64_t count_tb_per_vcpu[MAX_CPUS];
+static uint64_t count_tb_inline_per_vcpu[MAX_CPUS];
+static uint64_t count_tb_inline_racy;
+static uint64_t count_insn;
+static uint64_t count_insn_per_vcpu[MAX_CPUS];
+static uint64_t count_insn_inline_per_vcpu[MAX_CPUS];
+static uint64_t count_insn_inline_racy;
+static uint64_t count_mem;
+static uint64_t count_mem_per_vcpu[MAX_CPUS];
+static uint64_t count_mem_inline_per_vcpu[MAX_CPUS];
+static uint64_t count_mem_inline_racy;
+static GMutex tb_lock;
+static GMutex insn_lock;
+static GMutex mem_lock;
+
+QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
+
+static uint64_t collect_per_vcpu(uint64_t *values)
+{
+    uint64_t count = 0;
+    for (int i = 0; i < MAX_CPUS; ++i) {
+        count += values[i];
+    }
+    return count;
+}
+
+static void stats_insn(void)
+{
+    const uint64_t expected = count_insn;
+    const uint64_t per_vcpu = collect_per_vcpu(count_insn_per_vcpu);
+    const uint64_t inl_per_vcpu = collect_per_vcpu(count_insn_inline_per_vcpu);
+    printf("insn: %" PRIu64 "\n", expected);
+    printf("insn: %" PRIu64 " (per vcpu)\n", per_vcpu);
+    printf("insn: %" PRIu64 " (per vcpu inline)\n", inl_per_vcpu);
+    printf("insn: %" PRIu64 " (inline racy)\n", count_insn_inline_racy);
+    g_assert(expected > 0);
+    g_assert(per_vcpu == expected);
+    g_assert(inl_per_vcpu == expected);
+    g_assert(count_insn_inline_racy <= expected);
+}
+
+static void stats_tb(void)
+{
+    const uint64_t expected = count_tb;
+    const uint64_t per_vcpu = collect_per_vcpu(count_tb_per_vcpu);
+    const uint64_t inl_per_vcpu = collect_per_vcpu(count_tb_inline_per_vcpu);
+    printf("tb: %" PRIu64 "\n", expected);
+    printf("tb: %" PRIu64 " (per vcpu)\n", per_vcpu);
+    printf("tb: %" PRIu64 " (per vcpu inline)\n", inl_per_vcpu);
+    printf("tb: %" PRIu64 " (inline racy)\n", count_tb_inline_racy);
+    g_assert(expected > 0);
+    g_assert(per_vcpu == expected);
+    g_assert(inl_per_vcpu == expected);
+    g_assert(count_tb_inline_racy <= expected);
+}
+
+static void stats_mem(void)
+{
+    const uint64_t expected = count_mem;
+    const uint64_t per_vcpu = collect_per_vcpu(count_mem_per_vcpu);
+    const uint64_t inl_per_vcpu = collect_per_vcpu(count_mem_inline_per_vcpu);
+    printf("mem: %" PRIu64 "\n", expected);
+    printf("mem: %" PRIu64 " (per vcpu)\n", per_vcpu);
+    printf("mem: %" PRIu64 " (per vcpu inline)\n", inl_per_vcpu);
+    printf("mem: %" PRIu64 " (inline racy)\n", count_mem_inline_racy);
+    g_assert(expected > 0);
+    g_assert(per_vcpu == expected);
+    g_assert(inl_per_vcpu == expected);
+    g_assert(count_mem_inline_racy <= expected);
+}
+
+static void plugin_exit(qemu_plugin_id_t id, void *udata)
+{
+    for (int i = 0; i < MAX_CPUS; ++i) {
+        const uint64_t tb = count_tb_per_vcpu[i];
+        const uint64_t tb_inline = count_tb_inline_per_vcpu[i];
+        const uint64_t insn = count_insn_per_vcpu[i];
+        const uint64_t insn_inline = count_insn_inline_per_vcpu[i];
+        const uint64_t mem = count_mem_per_vcpu[i];
+        const uint64_t mem_inline = count_mem_inline_per_vcpu[i];
+        printf("cpu %d: tb (%" PRIu64 ", %" PRIu64 ") | "
+               "insn (%" PRIu64 ", %" PRIu64 ") | "
+               "mem (%" PRIu64 ", %" PRIu64 ")"
+               "\n",
+               i, tb, tb_inline, insn, insn_inline, mem, mem_inline);
+        g_assert(tb == tb_inline);
+        g_assert(insn == insn_inline);
+        g_assert(mem == mem_inline);
+    }
+
+    stats_tb();
+    stats_insn();
+    stats_mem();
+}
+
+static void vcpu_tb_exec(unsigned int cpu_index, void *udata)
+{
+    count_tb_per_vcpu[cpu_index]++;
+    g_mutex_lock(&tb_lock);
+    count_tb++;
+    g_mutex_unlock(&tb_lock);
+}
+
+static void vcpu_insn_exec(unsigned int cpu_index, void *udata)
+{
+    count_insn_per_vcpu[cpu_index]++;
+    g_mutex_lock(&insn_lock);
+    count_insn++;
+    g_mutex_unlock(&insn_lock);
+}
+
+static void vcpu_mem_access(unsigned int cpu_index,
+                            qemu_plugin_meminfo_t info,
+                            uint64_t vaddr,
+                            void *userdata)
+{
+    count_mem_per_vcpu[cpu_index]++;
+    g_mutex_lock(&mem_lock);
+    count_mem++;
+    g_mutex_unlock(&mem_lock);
+}
+
+static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
+{
+    qemu_plugin_register_vcpu_tb_exec_cb(tb, vcpu_tb_exec,
+                                         QEMU_PLUGIN_CB_NO_REGS, 0);
+    qemu_plugin_register_vcpu_tb_exec_inline(tb, QEMU_PLUGIN_INLINE_ADD_U64,
+                                             &count_tb_inline_racy, 1);
+    qemu_plugin_register_vcpu_tb_exec_inline_per_vcpu(
+        tb, QEMU_PLUGIN_INLINE_ADD_U64,
+        count_tb_inline_per_vcpu, sizeof(uint64_t), 1);
+
+    for (int idx = 0; idx < qemu_plugin_tb_n_insns(tb); ++idx) {
+        struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, idx);
+        qemu_plugin_register_vcpu_insn_exec_cb(insn, vcpu_insn_exec,
+                                               QEMU_PLUGIN_CB_NO_REGS, 0);
+        qemu_plugin_register_vcpu_insn_exec_inline(
+            insn, QEMU_PLUGIN_INLINE_ADD_U64,
+            &count_insn_inline_racy, 1);
+        qemu_plugin_register_vcpu_insn_exec_inline_per_vcpu(
+            insn, QEMU_PLUGIN_INLINE_ADD_U64,
+            count_insn_inline_per_vcpu, sizeof(uint64_t), 1);
+        qemu_plugin_register_vcpu_mem_cb(insn, &vcpu_mem_access,
+                                         QEMU_PLUGIN_CB_NO_REGS,
+                                         QEMU_PLUGIN_MEM_RW, 0);
+        qemu_plugin_register_vcpu_mem_inline(insn, QEMU_PLUGIN_MEM_RW,
+                                             QEMU_PLUGIN_INLINE_ADD_U64,
+                                             &count_mem_inline_racy, 1);
+        qemu_plugin_register_vcpu_mem_inline_per_vcpu(
+            insn, QEMU_PLUGIN_MEM_RW,
+            QEMU_PLUGIN_INLINE_ADD_U64,
+            count_mem_inline_per_vcpu, sizeof(uint64_t), 1);
+    }
+}
+
+QEMU_PLUGIN_EXPORT
+int qemu_plugin_install(qemu_plugin_id_t id, const qemu_info_t *info,
+                        int argc, char **argv)
+{
+    g_assert(info->system.smp_vcpus <= MAX_CPUS);
+    qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
+    qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
+
+    return 0;
+}
diff --git a/tests/plugin/meson.build b/tests/plugin/meson.build
index e18183aaeda..9eece5bab51 100644
--- a/tests/plugin/meson.build
+++ b/tests/plugin/meson.build
@@ -1,6 +1,6 @@
 t = []
 if get_option('plugins')
-  foreach i : ['bb', 'empty', 'insn', 'mem', 'syscall']
+  foreach i : ['bb', 'empty', 'inline', 'insn', 'mem', 'syscall']
     if host_os == 'windows'
       t += shared_module(i, files(i + '.c') + '../../contrib/plugins/win32_linker.c',
                         include_directories: '../../include/qemu',
-- 
2.43.0