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qemu/tests/tcg/plugins/mem.c
Pierrick Bouvier eb3f69cac6 tests/tcg/plugins/mem.c: remove dependency on qemu headers 
This plugin uses endianness conversion primitives from QEMU headers. As
next commit will strongly isolate plugins code from those headers, those
primitives can't be used anymore.

glib.h provides such primitives:
https://docs.gtk.org/glib/conversion-macros.html#byte-order-conversion

Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/qemu-devel/20260124182921.531562-6-pierrick.bouvier@linaro.org
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
2026-01-29 09:34:14 -08:00

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/*
* Copyright (C) 2018, Emilio G. Cota <cota@braap.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 <string.h>
#include <unistd.h>
#include <stdio.h>
#include <glib.h>
#include <stdbool.h>
#include <qemu-plugin.h>
QEMU_PLUGIN_EXPORT int qemu_plugin_version = QEMU_PLUGIN_VERSION;
typedef struct {
uint64_t mem_count;
uint64_t io_count;
} CPUCount;
typedef struct {
uint64_t vaddr;
const char *sym;
} InsnInfo;
/*
* For the "memory" system test we need to track accesses to
* individual regions. We mirror the data written to the region and
* then check when it is read that it matches up.
*
* We do this as regions rather than pages to save on complications
* with page crossing and the fact the test only cares about the
* test_data region.
*/
static uint64_t region_size = 4096 * 4;
static uint64_t region_mask;
typedef struct {
uint64_t region_address;
uint64_t reads;
uint64_t writes;
uint8_t *data;
/* Did we see every write and read with correct values? */
bool seen_all;
} RegionInfo;
static struct qemu_plugin_scoreboard *counts;
static qemu_plugin_u64 mem_count;
static qemu_plugin_u64 io_count;
static bool do_inline, do_callback, do_print_accesses, do_region_summary;
static bool do_haddr;
static enum qemu_plugin_mem_rw rw = QEMU_PLUGIN_MEM_RW;
static GMutex lock;
static GHashTable *regions;
static gint addr_order(gconstpointer a, gconstpointer b, gpointer d)
{
RegionInfo *na = (RegionInfo *) a;
RegionInfo *nb = (RegionInfo *) b;
return na->region_address > nb->region_address ? 1 : -1;
}
static void plugin_exit(qemu_plugin_id_t id, void *p)
{
g_autoptr(GString) out = g_string_new("");
if (do_inline || do_callback) {
g_string_printf(out, "mem accesses: %" PRIu64 "\n",
qemu_plugin_u64_sum(mem_count));
}
if (do_haddr) {
g_string_append_printf(out, "io accesses: %" PRIu64 "\n",
qemu_plugin_u64_sum(io_count));
}
qemu_plugin_outs(out->str);
if (do_region_summary) {
GList *counts = g_hash_table_get_values(regions);
counts = g_list_sort_with_data(counts, addr_order, NULL);
g_string_printf(out, "Region Base, Reads, Writes, Seen all\n");
if (counts && g_list_next(counts)) {
for (/* counts */; counts; counts = counts->next) {
RegionInfo *ri = (RegionInfo *) counts->data;
g_string_append_printf(out,
"0x%016"PRIx64", "
"%"PRId64", %"PRId64", %s\n",
ri->region_address,
ri->reads,
ri->writes,
ri->seen_all ? "true" : "false");
}
}
qemu_plugin_outs(out->str);
}
qemu_plugin_scoreboard_free(counts);
}
/*
* Update the region tracking info for the access. We split up accesses
* that span regions even though the plugin infrastructure will deliver
* it as a single access.
*/
static void update_region_info(uint64_t region, uint64_t offset,
qemu_plugin_meminfo_t meminfo,
qemu_plugin_mem_value value,
unsigned size)
{
bool be = qemu_plugin_mem_is_big_endian(meminfo);
bool is_store = qemu_plugin_mem_is_store(meminfo);
RegionInfo *ri;
bool unseen_data = false;
g_assert(offset + size <= region_size);
g_mutex_lock(&lock);
ri = (RegionInfo *) g_hash_table_lookup(regions, &region);
if (!ri) {
ri = g_new0(RegionInfo, 1);
ri->region_address = region;
ri->data = g_malloc0(region_size);
ri->seen_all = true;
g_hash_table_insert(regions, &ri->region_address, ri);
}
if (is_store) {
ri->writes++;
} else {
ri->reads++;
}
void *ri_data = &ri->data[offset];
switch (value.type) {
case QEMU_PLUGIN_MEM_VALUE_U8:
{
uint8_t val = value.data.u8;
uint8_t *p = ri_data;
if (is_store) {
*p = val;
} else {
unseen_data = *p != val;
}
break;
}
case QEMU_PLUGIN_MEM_VALUE_U16:
{
uint16_t val = be ? GUINT16_FROM_BE(value.data.u16) :
GUINT16_FROM_LE(value.data.u16);
uint16_t *p = ri_data;
if (is_store) {
*p = val;
} else {
unseen_data = *p != val;
}
break;
}
case QEMU_PLUGIN_MEM_VALUE_U32:
{
uint32_t val = be ? GUINT32_FROM_BE(value.data.u32) :
GUINT32_FROM_LE(value.data.u32);
uint32_t *p = ri_data;
if (is_store) {
*p = val;
} else {
unseen_data = *p != val;
}
break;
}
case QEMU_PLUGIN_MEM_VALUE_U64:
{
uint64_t val = be ? GUINT64_FROM_BE(value.data.u64) :
GUINT64_FROM_LE(value.data.u64);
uint64_t *p = ri_data;
if (is_store) {
*p = val;
} else {
unseen_data = *p != val;
}
break;
}
case QEMU_PLUGIN_MEM_VALUE_U128:
/* non in test so skip */
break;
default:
g_assert_not_reached();
}
/*
* This is expected for regions initialised by QEMU (.text etc) but we
* expect to see all data read and written to the test_data region
* of the memory test.
*/
if (unseen_data && ri->seen_all) {
g_autoptr(GString) error = g_string_new("Warning: ");
g_string_append_printf(error, "0x%016"PRIx64":%"PRId64
" read an un-instrumented value\n",
region, offset);
qemu_plugin_outs(error->str);
ri->seen_all = false;
}
g_mutex_unlock(&lock);
}
static void vcpu_mem(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
uint64_t vaddr, void *udata)
{
if (do_haddr) {
struct qemu_plugin_hwaddr *hwaddr;
hwaddr = qemu_plugin_get_hwaddr(meminfo, vaddr);
if (qemu_plugin_hwaddr_is_io(hwaddr)) {
qemu_plugin_u64_add(io_count, cpu_index, 1);
} else {
qemu_plugin_u64_add(mem_count, cpu_index, 1);
}
} else {
qemu_plugin_u64_add(mem_count, cpu_index, 1);
}
if (do_region_summary) {
uint64_t region = vaddr & ~region_mask;
uint64_t offset = vaddr & region_mask;
qemu_plugin_mem_value value = qemu_plugin_mem_get_value(meminfo);
unsigned size = 1 << qemu_plugin_mem_size_shift(meminfo);
update_region_info(region, offset, meminfo, value, size);
}
}
static void print_access(unsigned int cpu_index, qemu_plugin_meminfo_t meminfo,
uint64_t vaddr, void *udata)
{
InsnInfo *insn_info = udata;
unsigned size = 8 << qemu_plugin_mem_size_shift(meminfo);
const char *type = qemu_plugin_mem_is_store(meminfo) ? "store" : "load";
qemu_plugin_mem_value value = qemu_plugin_mem_get_value(meminfo);
uint64_t hwaddr =
qemu_plugin_hwaddr_phys_addr(qemu_plugin_get_hwaddr(meminfo, vaddr));
g_autoptr(GString) out = g_string_new("");
g_string_printf(out,
"0x%"PRIx64",%s,0x%"PRIx64",0x%"PRIx64",%d,%s,",
insn_info->vaddr, insn_info->sym,
vaddr, hwaddr, size, type);
switch (value.type) {
case QEMU_PLUGIN_MEM_VALUE_U8:
g_string_append_printf(out, "0x%02"PRIx8, value.data.u8);
break;
case QEMU_PLUGIN_MEM_VALUE_U16:
g_string_append_printf(out, "0x%04"PRIx16, value.data.u16);
break;
case QEMU_PLUGIN_MEM_VALUE_U32:
g_string_append_printf(out, "0x%08"PRIx32, value.data.u32);
break;
case QEMU_PLUGIN_MEM_VALUE_U64:
g_string_append_printf(out, "0x%016"PRIx64, value.data.u64);
break;
case QEMU_PLUGIN_MEM_VALUE_U128:
g_string_append_printf(out, "0x%016"PRIx64"%016"PRIx64,
value.data.u128.high, value.data.u128.low);
break;
default:
g_assert_not_reached();
}
g_string_append_printf(out, "\n");
qemu_plugin_outs(out->str);
}
static void vcpu_tb_trans(qemu_plugin_id_t id, struct qemu_plugin_tb *tb)
{
size_t n = qemu_plugin_tb_n_insns(tb);
size_t i;
for (i = 0; i < n; i++) {
struct qemu_plugin_insn *insn = qemu_plugin_tb_get_insn(tb, i);
if (do_inline) {
qemu_plugin_register_vcpu_mem_inline_per_vcpu(
insn, rw,
QEMU_PLUGIN_INLINE_ADD_U64,
mem_count, 1);
}
if (do_callback || do_region_summary) {
qemu_plugin_register_vcpu_mem_cb(insn, vcpu_mem,
QEMU_PLUGIN_CB_NO_REGS,
rw, NULL);
}
if (do_print_accesses) {
/* we leak this pointer, to avoid locking to keep track of it */
InsnInfo *insn_info = g_malloc(sizeof(InsnInfo));
const char *sym = qemu_plugin_insn_symbol(insn);
insn_info->sym = sym ? sym : "";
insn_info->vaddr = qemu_plugin_insn_vaddr(insn);
qemu_plugin_register_vcpu_mem_cb(insn, print_access,
QEMU_PLUGIN_CB_NO_REGS,
rw, (void *) insn_info);
}
}
}
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], "haddr") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_haddr)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "track") == 0) {
if (g_strcmp0(tokens[1], "r") == 0) {
rw = QEMU_PLUGIN_MEM_R;
} else if (g_strcmp0(tokens[1], "w") == 0) {
rw = QEMU_PLUGIN_MEM_W;
} else if (g_strcmp0(tokens[1], "rw") == 0) {
rw = QEMU_PLUGIN_MEM_RW;
} else {
fprintf(stderr, "invalid value for argument track: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "inline") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_inline)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "callback") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &do_callback)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "print-accesses") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1],
&do_print_accesses)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else if (g_strcmp0(tokens[0], "region-summary") == 0) {
if (!qemu_plugin_bool_parse(tokens[0], tokens[1],
&do_region_summary)) {
fprintf(stderr, "boolean argument parsing failed: %s\n", opt);
return -1;
}
} else {
fprintf(stderr, "option parsing failed: %s\n", opt);
return -1;
}
}
if (do_inline && do_callback) {
fprintf(stderr,
"can't enable inline and callback counting at the same time\n");
return -1;
}
if (do_print_accesses) {
g_autoptr(GString) out = g_string_new("");
g_string_printf(out,
"insn_vaddr,insn_symbol,mem_vaddr,mem_hwaddr,"
"access_size,access_type,mem_value\n");
qemu_plugin_outs(out->str);
}
if (do_region_summary) {
region_mask = (region_size - 1);
regions = g_hash_table_new(g_int64_hash, g_int64_equal);
}
counts = qemu_plugin_scoreboard_new(sizeof(CPUCount));
mem_count = qemu_plugin_scoreboard_u64_in_struct(
counts, CPUCount, mem_count);
io_count = qemu_plugin_scoreboard_u64_in_struct(counts, CPUCount, io_count);
qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);
qemu_plugin_register_atexit_cb(id, plugin_exit, NULL);
return 0;
}
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