qemu/qdev-monitor.c
Markus Armbruster 84d18f065f Use error_is_set() only when necessary
error_is_set(&var) is the same as var != NULL, but it takes
whole-program analysis to figure that out.  Unnecessarily hard for
optimizers, static checkers, and human readers.  Dumb it down to
obvious.

Gets rid of several dozen Coverity false positives.

Note that the obvious form is already used in many places.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2014-02-17 11:57:23 -05:00

746 lines
20 KiB
C

/*
* Dynamic device configuration and creation.
*
* Copyright (c) 2009 CodeSourcery
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "hw/qdev.h"
#include "hw/sysbus.h"
#include "monitor/monitor.h"
#include "monitor/qdev.h"
#include "qmp-commands.h"
#include "sysemu/arch_init.h"
#include "qemu/config-file.h"
/*
* Aliases were a bad idea from the start. Let's keep them
* from spreading further.
*/
typedef struct QDevAlias
{
const char *typename;
const char *alias;
uint32_t arch_mask;
} QDevAlias;
static const QDevAlias qdev_alias_table[] = {
{ "virtio-blk-pci", "virtio-blk", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-net-pci", "virtio-net", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-serial-pci", "virtio-serial", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-balloon-pci", "virtio-balloon",
QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-blk-s390", "virtio-blk", QEMU_ARCH_S390X },
{ "virtio-net-s390", "virtio-net", QEMU_ARCH_S390X },
{ "virtio-serial-s390", "virtio-serial", QEMU_ARCH_S390X },
{ "lsi53c895a", "lsi" },
{ "ich9-ahci", "ahci" },
{ "kvm-pci-assign", "pci-assign" },
{ }
};
static const char *qdev_class_get_alias(DeviceClass *dc)
{
const char *typename = object_class_get_name(OBJECT_CLASS(dc));
int i;
for (i = 0; qdev_alias_table[i].typename; i++) {
if (qdev_alias_table[i].arch_mask &&
!(qdev_alias_table[i].arch_mask & arch_type)) {
continue;
}
if (strcmp(qdev_alias_table[i].typename, typename) == 0) {
return qdev_alias_table[i].alias;
}
}
return NULL;
}
static bool qdev_class_has_alias(DeviceClass *dc)
{
return (qdev_class_get_alias(dc) != NULL);
}
static void qdev_print_devinfo(DeviceClass *dc)
{
error_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
if (dc->bus_type) {
error_printf(", bus %s", dc->bus_type);
}
if (qdev_class_has_alias(dc)) {
error_printf(", alias \"%s\"", qdev_class_get_alias(dc));
}
if (dc->desc) {
error_printf(", desc \"%s\"", dc->desc);
}
if (dc->cannot_instantiate_with_device_add_yet) {
error_printf(", no-user");
}
error_printf("\n");
}
static gint devinfo_cmp(gconstpointer a, gconstpointer b)
{
return strcasecmp(object_class_get_name((ObjectClass *)a),
object_class_get_name((ObjectClass *)b));
}
static void qdev_print_devinfos(bool show_no_user)
{
static const char *cat_name[DEVICE_CATEGORY_MAX + 1] = {
[DEVICE_CATEGORY_BRIDGE] = "Controller/Bridge/Hub",
[DEVICE_CATEGORY_USB] = "USB",
[DEVICE_CATEGORY_STORAGE] = "Storage",
[DEVICE_CATEGORY_NETWORK] = "Network",
[DEVICE_CATEGORY_INPUT] = "Input",
[DEVICE_CATEGORY_DISPLAY] = "Display",
[DEVICE_CATEGORY_SOUND] = "Sound",
[DEVICE_CATEGORY_MISC] = "Misc",
[DEVICE_CATEGORY_MAX] = "Uncategorized",
};
GSList *list, *elt;
int i;
bool cat_printed;
list = g_slist_sort(object_class_get_list(TYPE_DEVICE, false),
devinfo_cmp);
for (i = 0; i <= DEVICE_CATEGORY_MAX; i++) {
cat_printed = false;
for (elt = list; elt; elt = elt->next) {
DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
TYPE_DEVICE);
if ((i < DEVICE_CATEGORY_MAX
? !test_bit(i, dc->categories)
: !bitmap_empty(dc->categories, DEVICE_CATEGORY_MAX))
|| (!show_no_user
&& dc->cannot_instantiate_with_device_add_yet)) {
continue;
}
if (!cat_printed) {
error_printf("%s%s devices:\n", i ? "\n" : "",
cat_name[i]);
cat_printed = true;
}
qdev_print_devinfo(dc);
}
}
g_slist_free(list);
}
static int set_property(const char *name, const char *value, void *opaque)
{
DeviceState *dev = opaque;
Error *err = NULL;
if (strcmp(name, "driver") == 0)
return 0;
if (strcmp(name, "bus") == 0)
return 0;
qdev_prop_parse(dev, name, value, &err);
if (err != NULL) {
qerror_report_err(err);
error_free(err);
return -1;
}
return 0;
}
static const char *find_typename_by_alias(const char *alias)
{
int i;
for (i = 0; qdev_alias_table[i].alias; i++) {
if (qdev_alias_table[i].arch_mask &&
!(qdev_alias_table[i].arch_mask & arch_type)) {
continue;
}
if (strcmp(qdev_alias_table[i].alias, alias) == 0) {
return qdev_alias_table[i].typename;
}
}
return NULL;
}
int qdev_device_help(QemuOpts *opts)
{
const char *driver;
Property *prop;
ObjectClass *klass;
driver = qemu_opt_get(opts, "driver");
if (driver && is_help_option(driver)) {
qdev_print_devinfos(false);
return 1;
}
if (!driver || !qemu_opt_has_help_opt(opts)) {
return 0;
}
klass = object_class_by_name(driver);
if (!klass) {
const char *typename = find_typename_by_alias(driver);
if (typename) {
driver = typename;
klass = object_class_by_name(driver);
}
}
if (!klass) {
return 0;
}
do {
for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
/*
* TODO Properties without a parser are just for dirty hacks.
* qdev_prop_ptr is the only such PropertyInfo. It's marked
* for removal. This conditional should be removed along with
* it.
*/
if (!prop->info->set) {
continue; /* no way to set it, don't show */
}
error_printf("%s.%s=%s\n", driver, prop->name,
prop->info->legacy_name ?: prop->info->name);
}
klass = object_class_get_parent(klass);
} while (klass != object_class_by_name(TYPE_DEVICE));
return 1;
}
static Object *qdev_get_peripheral(void)
{
static Object *dev;
if (dev == NULL) {
dev = container_get(qdev_get_machine(), "/peripheral");
}
return dev;
}
static Object *qdev_get_peripheral_anon(void)
{
static Object *dev;
if (dev == NULL) {
dev = container_get(qdev_get_machine(), "/peripheral-anon");
}
return dev;
}
static void qbus_list_bus(DeviceState *dev)
{
BusState *child;
const char *sep = " ";
error_printf("child busses at \"%s\":",
dev->id ? dev->id : object_get_typename(OBJECT(dev)));
QLIST_FOREACH(child, &dev->child_bus, sibling) {
error_printf("%s\"%s\"", sep, child->name);
sep = ", ";
}
error_printf("\n");
}
static void qbus_list_dev(BusState *bus)
{
BusChild *kid;
const char *sep = " ";
error_printf("devices at \"%s\":", bus->name);
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
error_printf("%s\"%s\"", sep, object_get_typename(OBJECT(dev)));
if (dev->id)
error_printf("/\"%s\"", dev->id);
sep = ", ";
}
error_printf("\n");
}
static BusState *qbus_find_bus(DeviceState *dev, char *elem)
{
BusState *child;
QLIST_FOREACH(child, &dev->child_bus, sibling) {
if (strcmp(child->name, elem) == 0) {
return child;
}
}
return NULL;
}
static DeviceState *qbus_find_dev(BusState *bus, char *elem)
{
BusChild *kid;
/*
* try to match in order:
* (1) instance id, if present
* (2) driver name
* (3) driver alias, if present
*/
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
if (dev->id && strcmp(dev->id, elem) == 0) {
return dev;
}
}
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
if (strcmp(object_get_typename(OBJECT(dev)), elem) == 0) {
return dev;
}
}
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
DeviceClass *dc = DEVICE_GET_CLASS(dev);
if (qdev_class_has_alias(dc) &&
strcmp(qdev_class_get_alias(dc), elem) == 0) {
return dev;
}
}
return NULL;
}
static BusState *qbus_find_recursive(BusState *bus, const char *name,
const char *bus_typename)
{
BusClass *bus_class = BUS_GET_CLASS(bus);
BusChild *kid;
BusState *child, *ret;
int match = 1;
if (name && (strcmp(bus->name, name) != 0)) {
match = 0;
} else if (bus_typename && !object_dynamic_cast(OBJECT(bus), bus_typename)) {
match = 0;
} else if ((bus_class->max_dev != 0) && (bus_class->max_dev <= bus->max_index)) {
if (name != NULL) {
/* bus was explicitly specified: return an error. */
qerror_report(ERROR_CLASS_GENERIC_ERROR, "Bus '%s' is full",
bus->name);
return NULL;
} else {
/* bus was not specified: try to find another one. */
match = 0;
}
}
if (match) {
return bus;
}
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
QLIST_FOREACH(child, &dev->child_bus, sibling) {
ret = qbus_find_recursive(child, name, bus_typename);
if (ret) {
return ret;
}
}
}
return NULL;
}
static BusState *qbus_find(const char *path)
{
DeviceState *dev;
BusState *bus;
char elem[128];
int pos, len;
/* find start element */
if (path[0] == '/') {
bus = sysbus_get_default();
pos = 0;
} else {
if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
assert(!path[0]);
elem[0] = len = 0;
}
bus = qbus_find_recursive(sysbus_get_default(), elem, NULL);
if (!bus) {
qerror_report(QERR_BUS_NOT_FOUND, elem);
return NULL;
}
pos = len;
}
for (;;) {
assert(path[pos] == '/' || !path[pos]);
while (path[pos] == '/') {
pos++;
}
if (path[pos] == '\0') {
return bus;
}
/* find device */
if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
g_assert_not_reached();
elem[0] = len = 0;
}
pos += len;
dev = qbus_find_dev(bus, elem);
if (!dev) {
qerror_report(QERR_DEVICE_NOT_FOUND, elem);
if (!monitor_cur_is_qmp()) {
qbus_list_dev(bus);
}
return NULL;
}
assert(path[pos] == '/' || !path[pos]);
while (path[pos] == '/') {
pos++;
}
if (path[pos] == '\0') {
/* last specified element is a device. If it has exactly
* one child bus accept it nevertheless */
switch (dev->num_child_bus) {
case 0:
qerror_report(QERR_DEVICE_NO_BUS, elem);
return NULL;
case 1:
return QLIST_FIRST(&dev->child_bus);
default:
qerror_report(QERR_DEVICE_MULTIPLE_BUSSES, elem);
if (!monitor_cur_is_qmp()) {
qbus_list_bus(dev);
}
return NULL;
}
}
/* find bus */
if (sscanf(path+pos, "%127[^/]%n", elem, &len) != 1) {
g_assert_not_reached();
elem[0] = len = 0;
}
pos += len;
bus = qbus_find_bus(dev, elem);
if (!bus) {
qerror_report(QERR_BUS_NOT_FOUND, elem);
if (!monitor_cur_is_qmp()) {
qbus_list_bus(dev);
}
return NULL;
}
}
}
DeviceState *qdev_device_add(QemuOpts *opts)
{
ObjectClass *oc;
DeviceClass *dc;
const char *driver, *path, *id;
DeviceState *dev;
BusState *bus = NULL;
Error *err = NULL;
driver = qemu_opt_get(opts, "driver");
if (!driver) {
qerror_report(QERR_MISSING_PARAMETER, "driver");
return NULL;
}
/* find driver */
oc = object_class_by_name(driver);
if (!oc) {
const char *typename = find_typename_by_alias(driver);
if (typename) {
driver = typename;
oc = object_class_by_name(driver);
}
}
if (!object_class_dynamic_cast(oc, TYPE_DEVICE)) {
qerror_report(ERROR_CLASS_GENERIC_ERROR,
"'%s' is not a valid device model name", driver);
return NULL;
}
if (object_class_is_abstract(oc)) {
qerror_report(QERR_INVALID_PARAMETER_VALUE, "driver",
"non-abstract device type");
return NULL;
}
dc = DEVICE_CLASS(oc);
if (dc->cannot_instantiate_with_device_add_yet) {
qerror_report(QERR_INVALID_PARAMETER_VALUE, "driver",
"pluggable device type");
return NULL;
}
/* find bus */
path = qemu_opt_get(opts, "bus");
if (path != NULL) {
bus = qbus_find(path);
if (!bus) {
return NULL;
}
if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
qerror_report(QERR_BAD_BUS_FOR_DEVICE,
driver, object_get_typename(OBJECT(bus)));
return NULL;
}
} else if (dc->bus_type != NULL) {
bus = qbus_find_recursive(sysbus_get_default(), NULL, dc->bus_type);
if (!bus) {
qerror_report(QERR_NO_BUS_FOR_DEVICE,
dc->bus_type, driver);
return NULL;
}
}
if (qdev_hotplug && bus && !bus->allow_hotplug) {
qerror_report(QERR_BUS_NO_HOTPLUG, bus->name);
return NULL;
}
/* create device, set properties */
dev = DEVICE(object_new(driver));
if (bus) {
qdev_set_parent_bus(dev, bus);
}
id = qemu_opts_id(opts);
if (id) {
dev->id = id;
}
if (qemu_opt_foreach(opts, set_property, dev, 1) != 0) {
object_unparent(OBJECT(dev));
object_unref(OBJECT(dev));
return NULL;
}
if (dev->id) {
object_property_add_child(qdev_get_peripheral(), dev->id,
OBJECT(dev), NULL);
} else {
static int anon_count;
gchar *name = g_strdup_printf("device[%d]", anon_count++);
object_property_add_child(qdev_get_peripheral_anon(), name,
OBJECT(dev), NULL);
g_free(name);
}
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err != NULL) {
qerror_report_err(err);
error_free(err);
object_unparent(OBJECT(dev));
object_unref(OBJECT(dev));
qerror_report(QERR_DEVICE_INIT_FAILED, driver);
return NULL;
}
dev->opts = opts;
return dev;
}
#define qdev_printf(fmt, ...) monitor_printf(mon, "%*s" fmt, indent, "", ## __VA_ARGS__)
static void qbus_print(Monitor *mon, BusState *bus, int indent);
static void qdev_print_props(Monitor *mon, DeviceState *dev, Property *props,
int indent)
{
if (!props)
return;
for (; props->name; props++) {
Error *err = NULL;
char *value;
char *legacy_name = g_strdup_printf("legacy-%s", props->name);
if (object_property_get_type(OBJECT(dev), legacy_name, NULL)) {
value = object_property_get_str(OBJECT(dev), legacy_name, &err);
} else {
value = object_property_print(OBJECT(dev), props->name, &err);
}
g_free(legacy_name);
if (err) {
error_free(err);
continue;
}
qdev_printf("%s = %s\n", props->name,
value && *value ? value : "<null>");
g_free(value);
}
}
static void bus_print_dev(BusState *bus, Monitor *mon, DeviceState *dev, int indent)
{
BusClass *bc = BUS_GET_CLASS(bus);
if (bc->print_dev) {
bc->print_dev(mon, dev, indent);
}
}
static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
{
ObjectClass *class;
BusState *child;
qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
dev->id ? dev->id : "");
indent += 2;
if (dev->num_gpio_in) {
qdev_printf("gpio-in %d\n", dev->num_gpio_in);
}
if (dev->num_gpio_out) {
qdev_printf("gpio-out %d\n", dev->num_gpio_out);
}
class = object_get_class(OBJECT(dev));
do {
qdev_print_props(mon, dev, DEVICE_CLASS(class)->props, indent);
class = object_class_get_parent(class);
} while (class != object_class_by_name(TYPE_DEVICE));
bus_print_dev(dev->parent_bus, mon, dev, indent);
QLIST_FOREACH(child, &dev->child_bus, sibling) {
qbus_print(mon, child, indent);
}
}
static void qbus_print(Monitor *mon, BusState *bus, int indent)
{
BusChild *kid;
qdev_printf("bus: %s\n", bus->name);
indent += 2;
qdev_printf("type %s\n", object_get_typename(OBJECT(bus)));
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
qdev_print(mon, dev, indent);
}
}
#undef qdev_printf
void do_info_qtree(Monitor *mon, const QDict *qdict)
{
if (sysbus_get_default())
qbus_print(mon, sysbus_get_default(), 0);
}
void do_info_qdm(Monitor *mon, const QDict *qdict)
{
qdev_print_devinfos(true);
}
int do_device_add(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
Error *local_err = NULL;
QemuOpts *opts;
DeviceState *dev;
opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
if (local_err) {
qerror_report_err(local_err);
error_free(local_err);
return -1;
}
if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
qemu_opts_del(opts);
return 0;
}
dev = qdev_device_add(opts);
if (!dev) {
qemu_opts_del(opts);
return -1;
}
object_unref(OBJECT(dev));
return 0;
}
void qmp_device_del(const char *id, Error **errp)
{
DeviceState *dev;
dev = qdev_find_recursive(sysbus_get_default(), id);
if (NULL == dev) {
error_set(errp, QERR_DEVICE_NOT_FOUND, id);
return;
}
qdev_unplug(dev, errp);
}
void qdev_machine_init(void)
{
qdev_get_peripheral_anon();
qdev_get_peripheral();
}
QemuOptsList qemu_device_opts = {
.name = "device",
.implied_opt_name = "driver",
.head = QTAILQ_HEAD_INITIALIZER(qemu_device_opts.head),
.desc = {
/*
* no elements => accept any
* sanity checking will happen later
* when setting device properties
*/
{ /* end of list */ }
},
};
QemuOptsList qemu_global_opts = {
.name = "global",
.head = QTAILQ_HEAD_INITIALIZER(qemu_global_opts.head),
.desc = {
{
.name = "driver",
.type = QEMU_OPT_STRING,
},{
.name = "property",
.type = QEMU_OPT_STRING,
},{
.name = "value",
.type = QEMU_OPT_STRING,
},
{ /* end of list */ }
},
};
int qemu_global_option(const char *str)
{
char driver[64], property[64];
QemuOpts *opts;
int rc, offset;
rc = sscanf(str, "%63[^.].%63[^=]%n", driver, property, &offset);
if (rc < 2 || str[offset] != '=') {
error_report("can't parse: \"%s\"", str);
return -1;
}
opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
qemu_opt_set(opts, "driver", driver);
qemu_opt_set(opts, "property", property);
qemu_opt_set(opts, "value", str+offset+1);
return 0;
}