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xemu/qtest.c
Anthony Liguori 0fbf01fe91 qtest: use synchronous I/O for char device 
Peter reported that rtc-test would periodically hang.  It turns out
this was due to an EAGAIN occurring on qemu_chr_fe_write.

Instead of heavily refactoring qtest, just use a synchronous version
of the write operation for qemu_chr_fe_write to address this problem.

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-03-26 10:08:12 -05:00

526 lines
13 KiB
C
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/*
* Test Server
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "sysemu/qtest.h"
#include "hw/qdev.h"
#include "char/char.h"
#include "exec/ioport.h"
#include "exec/memory.h"
#include "hw/irq.h"
#include "sysemu/sysemu.h"
#include "sysemu/cpus.h"
#define MAX_IRQ 256
const char *qtest_chrdev;
const char *qtest_log;
bool qtest_allowed;
static DeviceState *irq_intercept_dev;
static FILE *qtest_log_fp;
static CharDriverState *qtest_chr;
static GString *inbuf;
static int irq_levels[MAX_IRQ];
static qemu_timeval start_time;
static bool qtest_opened;
#define FMT_timeval "%ld.%06ld"
/**
* QTest Protocol
*
* Line based protocol, request/response based. Server can send async messages
* so clients should always handle many async messages before the response
* comes in.
*
* Valid requests
*
* Clock management:
*
* The qtest client is completely in charge of the vm_clock. qtest commands
* let you adjust the value of the clock (monotonically). All the commands
* return the current value of the clock in nanoseconds.
*
* > clock_step
* < OK VALUE
*
* Advance the clock to the next deadline. Useful when waiting for
* asynchronous events.
*
* > clock_step NS
* < OK VALUE
*
* Advance the clock by NS nanoseconds.
*
* > clock_set NS
* < OK VALUE
*
* Advance the clock to NS nanoseconds (do nothing if it's already past).
*
* PIO and memory access:
*
* > outb ADDR VALUE
* < OK
*
* > outw ADDR VALUE
* < OK
*
* > outl ADDR VALUE
* < OK
*
* > inb ADDR
* < OK VALUE
*
* > inw ADDR
* < OK VALUE
*
* > inl ADDR
* < OK VALUE
*
* > writeb ADDR VALUE
* < OK
*
* > writew ADDR VALUE
* < OK
*
* > writel ADDR VALUE
* < OK
*
* > writeq ADDR VALUE
* < OK
*
* > readb ADDR
* < OK VALUE
*
* > readw ADDR
* < OK VALUE
*
* > readl ADDR
* < OK VALUE
*
* > readq ADDR
* < OK VALUE
*
* > read ADDR SIZE
* < OK DATA
*
* > write ADDR SIZE DATA
* < OK
*
* ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
*
* DATA is an arbitrarily long hex number prefixed with '0x'. If it's smaller
* than the expected size, the value will be zero filled at the end of the data
* sequence.
*
* IRQ management:
*
* > irq_intercept_in QOM-PATH
* < OK
*
* > irq_intercept_out QOM-PATH
* < OK
*
* Attach to the gpio-in (resp. gpio-out) pins exported by the device at
* QOM-PATH. When the pin is triggered, one of the following async messages
* will be printed to the qtest stream:
*
* IRQ raise NUM
* IRQ lower NUM
*
* where NUM is an IRQ number. For the PC, interrupts can be intercepted
* simply with "irq_intercept_in ioapic" (note that IRQ0 comes out with
* NUM=0 even though it is remapped to GSI 2).
*/
static int hex2nib(char ch)
{
if (ch >= '0' && ch <= '9') {
return ch - '0';
} else if (ch >= 'a' && ch <= 'f') {
return 10 + (ch - 'a');
} else if (ch >= 'A' && ch <= 'F') {
return 10 + (ch - 'a');
} else {
return -1;
}
}
static void qtest_get_time(qemu_timeval *tv)
{
qemu_gettimeofday(tv);
tv->tv_sec -= start_time.tv_sec;
tv->tv_usec -= start_time.tv_usec;
if (tv->tv_usec < 0) {
tv->tv_usec += 1000000;
tv->tv_sec -= 1;
}
}
static void qtest_send_prefix(CharDriverState *chr)
{
qemu_timeval tv;
if (!qtest_log_fp || !qtest_opened) {
return;
}
qtest_get_time(&tv);
fprintf(qtest_log_fp, "[S +" FMT_timeval "] ",
tv.tv_sec, (long) tv.tv_usec);
}
static void GCC_FMT_ATTR(2, 3) qtest_send(CharDriverState *chr,
const char *fmt, ...)
{
va_list ap;
char buffer[1024];
size_t len;
va_start(ap, fmt);
len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
va_end(ap);
qemu_chr_fe_write_all(chr, (uint8_t *)buffer, len);
if (qtest_log_fp && qtest_opened) {
fprintf(qtest_log_fp, "%s", buffer);
}
}
static void qtest_irq_handler(void *opaque, int n, int level)
{
qemu_irq *old_irqs = opaque;
qemu_set_irq(old_irqs[n], level);
if (irq_levels[n] != level) {
CharDriverState *chr = qtest_chr;
irq_levels[n] = level;
qtest_send_prefix(chr);
qtest_send(chr, "IRQ %s %d\n",
level ? "raise" : "lower", n);
}
}
static void qtest_process_command(CharDriverState *chr, gchar **words)
{
const gchar *command;
g_assert(words);
command = words[0];
if (qtest_log_fp) {
qemu_timeval tv;
int i;
qtest_get_time(&tv);
fprintf(qtest_log_fp, "[R +" FMT_timeval "]",
tv.tv_sec, (long) tv.tv_usec);
for (i = 0; words[i]; i++) {
fprintf(qtest_log_fp, " %s", words[i]);
}
fprintf(qtest_log_fp, "\n");
}
g_assert(command);
if (strcmp(words[0], "irq_intercept_out") == 0
|| strcmp(words[0], "irq_intercept_in") == 0) {
DeviceState *dev;
g_assert(words[1]);
dev = DEVICE(object_resolve_path(words[1], NULL));
if (!dev) {
qtest_send_prefix(chr);
qtest_send(chr, "FAIL Unknown device\n");
return;
}
if (irq_intercept_dev) {
qtest_send_prefix(chr);
if (irq_intercept_dev != dev) {
qtest_send(chr, "FAIL IRQ intercept already enabled\n");
} else {
qtest_send(chr, "OK\n");
}
return;
}
if (words[0][14] == 'o') {
qemu_irq_intercept_out(&dev->gpio_out, qtest_irq_handler, dev->num_gpio_out);
} else {
qemu_irq_intercept_in(dev->gpio_in, qtest_irq_handler, dev->num_gpio_in);
}
irq_intercept_dev = dev;
qtest_send_prefix(chr);
qtest_send(chr, "OK\n");
} else if (strcmp(words[0], "outb") == 0 ||
strcmp(words[0], "outw") == 0 ||
strcmp(words[0], "outl") == 0) {
uint16_t addr;
uint32_t value;
g_assert(words[1] && words[2]);
addr = strtol(words[1], NULL, 0);
value = strtol(words[2], NULL, 0);
if (words[0][3] == 'b') {
cpu_outb(addr, value);
} else if (words[0][3] == 'w') {
cpu_outw(addr, value);
} else if (words[0][3] == 'l') {
cpu_outl(addr, value);
}
qtest_send_prefix(chr);
qtest_send(chr, "OK\n");
} else if (strcmp(words[0], "inb") == 0 ||
strcmp(words[0], "inw") == 0 ||
strcmp(words[0], "inl") == 0) {
uint16_t addr;
uint32_t value = -1U;
g_assert(words[1]);
addr = strtol(words[1], NULL, 0);
if (words[0][2] == 'b') {
value = cpu_inb(addr);
} else if (words[0][2] == 'w') {
value = cpu_inw(addr);
} else if (words[0][2] == 'l') {
value = cpu_inl(addr);
}
qtest_send_prefix(chr);
qtest_send(chr, "OK 0x%04x\n", value);
} else if (strcmp(words[0], "writeb") == 0 ||
strcmp(words[0], "writew") == 0 ||
strcmp(words[0], "writel") == 0 ||
strcmp(words[0], "writeq") == 0) {
uint64_t addr;
uint64_t value;
g_assert(words[1] && words[2]);
addr = strtoull(words[1], NULL, 0);
value = strtoull(words[2], NULL, 0);
if (words[0][5] == 'b') {
uint8_t data = value;
cpu_physical_memory_write(addr, &data, 1);
} else if (words[0][5] == 'w') {
uint16_t data = value;
tswap16s(&data);
cpu_physical_memory_write(addr, &data, 2);
} else if (words[0][5] == 'l') {
uint32_t data = value;
tswap32s(&data);
cpu_physical_memory_write(addr, &data, 4);
} else if (words[0][5] == 'q') {
uint64_t data = value;
tswap64s(&data);
cpu_physical_memory_write(addr, &data, 8);
}
qtest_send_prefix(chr);
qtest_send(chr, "OK\n");
} else if (strcmp(words[0], "readb") == 0 ||
strcmp(words[0], "readw") == 0 ||
strcmp(words[0], "readl") == 0 ||
strcmp(words[0], "readq") == 0) {
uint64_t addr;
uint64_t value = UINT64_C(-1);
g_assert(words[1]);
addr = strtoull(words[1], NULL, 0);
if (words[0][4] == 'b') {
uint8_t data;
cpu_physical_memory_read(addr, &data, 1);
value = data;
} else if (words[0][4] == 'w') {
uint16_t data;
cpu_physical_memory_read(addr, &data, 2);
value = tswap16(data);
} else if (words[0][4] == 'l') {
uint32_t data;
cpu_physical_memory_read(addr, &data, 4);
value = tswap32(data);
} else if (words[0][4] == 'q') {
cpu_physical_memory_read(addr, &value, 8);
tswap64s(&value);
}
qtest_send_prefix(chr);
qtest_send(chr, "OK 0x%016" PRIx64 "\n", value);
} else if (strcmp(words[0], "read") == 0) {
uint64_t addr, len, i;
uint8_t *data;
g_assert(words[1] && words[2]);
addr = strtoull(words[1], NULL, 0);
len = strtoull(words[2], NULL, 0);
data = g_malloc(len);
cpu_physical_memory_read(addr, data, len);
qtest_send_prefix(chr);
qtest_send(chr, "OK 0x");
for (i = 0; i < len; i++) {
qtest_send(chr, "%02x", data[i]);
}
qtest_send(chr, "\n");
g_free(data);
} else if (strcmp(words[0], "write") == 0) {
uint64_t addr, len, i;
uint8_t *data;
size_t data_len;
g_assert(words[1] && words[2] && words[3]);
addr = strtoull(words[1], NULL, 0);
len = strtoull(words[2], NULL, 0);
data_len = strlen(words[3]);
if (data_len < 3) {
qtest_send(chr, "ERR invalid argument size\n");
return;
}
data = g_malloc(len);
for (i = 0; i < len; i++) {
if ((i * 2 + 4) <= data_len) {
data[i] = hex2nib(words[3][i * 2 + 2]) << 4;
data[i] |= hex2nib(words[3][i * 2 + 3]);
} else {
data[i] = 0;
}
}
cpu_physical_memory_write(addr, data, len);
g_free(data);
qtest_send_prefix(chr);
qtest_send(chr, "OK\n");
} else if (strcmp(words[0], "clock_step") == 0) {
int64_t ns;
if (words[1]) {
ns = strtoll(words[1], NULL, 0);
} else {
ns = qemu_clock_deadline(vm_clock);
}
qtest_clock_warp(qemu_get_clock_ns(vm_clock) + ns);
qtest_send_prefix(chr);
qtest_send(chr, "OK %"PRIi64"\n", (int64_t)qemu_get_clock_ns(vm_clock));
} else if (strcmp(words[0], "clock_set") == 0) {
int64_t ns;
g_assert(words[1]);
ns = strtoll(words[1], NULL, 0);
qtest_clock_warp(ns);
qtest_send_prefix(chr);
qtest_send(chr, "OK %"PRIi64"\n", (int64_t)qemu_get_clock_ns(vm_clock));
} else {
qtest_send_prefix(chr);
qtest_send(chr, "FAIL Unknown command `%s'\n", words[0]);
}
}
static void qtest_process_inbuf(CharDriverState *chr, GString *inbuf)
{
char *end;
while ((end = strchr(inbuf->str, '\n')) != NULL) {
size_t offset;
GString *cmd;
gchar **words;
offset = end - inbuf->str;
cmd = g_string_new_len(inbuf->str, offset);
g_string_erase(inbuf, 0, offset + 1);
words = g_strsplit(cmd->str, " ", 0);
qtest_process_command(chr, words);
g_strfreev(words);
g_string_free(cmd, TRUE);
}
}
static void qtest_read(void *opaque, const uint8_t *buf, int size)
{
CharDriverState *chr = opaque;
g_string_append_len(inbuf, (const gchar *)buf, size);
qtest_process_inbuf(chr, inbuf);
}
static int qtest_can_read(void *opaque)
{
return 1024;
}
static void qtest_event(void *opaque, int event)
{
int i;
switch (event) {
case CHR_EVENT_OPENED:
qemu_system_reset(false);
for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
irq_levels[i] = 0;
}
qemu_gettimeofday(&start_time);
qtest_opened = true;
if (qtest_log_fp) {
fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n",
start_time.tv_sec, (long) start_time.tv_usec);
}
break;
case CHR_EVENT_CLOSED:
qtest_opened = false;
if (qtest_log_fp) {
qemu_timeval tv;
qtest_get_time(&tv);
fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n",
tv.tv_sec, (long) tv.tv_usec);
}
break;
default:
break;
}
}
int qtest_init(void)
{
CharDriverState *chr;
g_assert(qtest_chrdev != NULL);
configure_icount("0");
chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
qemu_chr_add_handlers(chr, qtest_can_read, qtest_read, qtest_event, chr);
qemu_chr_fe_set_echo(chr, true);
inbuf = g_string_new("");
if (qtest_log) {
if (strcmp(qtest_log, "none") != 0) {
qtest_log_fp = fopen(qtest_log, "w+");
}
} else {
qtest_log_fp = stderr;
}
qtest_chr = chr;
return 0;
}
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