qemu/qdev-monitor.c
David Hildenbrand 07578b0ad6 qdev: Let the hotplug_handler_unplug() caller delete the device
When unplugging a device, at one point the device will be destroyed
via object_unparent(). This will, one the one hand, unrealize the
removed device hierarchy, and on the other hand, destroy/free the
device hierarchy.

When chaining hotplug handlers, we want to overwrite a bus hotplug
handler by the machine hotplug handler, to be able to perform
some part of the plug/unplug and to forward the calls to the bus hotplug
handler.

For now, the bus hotplug handler would trigger an object_unparent(), not
allowing us to perform some unplug action on a device after we forwarded
the call to the bus hotplug handler. The device would be gone at that
point.

machine_unplug_handler(dev)
    /* eventually do unplug stuff */
    bus_unplug_handler(dev)
    /* dev is gone, we can't do more unplug stuff */

So move the object_unparent() to the original caller of the unplug. For
now, keep the unrealize() at the original places of the
object_unparent(). For implicitly chained hotplug handlers (e.g. pc
code calling acpi hotplug handlers), the object_unparent() has to be
done by the outermost caller. So when calling hotplug_handler_unplug()
from inside an unplug handler, nothing is to be done.

hotplug_handler_unplug(dev) -> calls machine_unplug_handler()
    machine_unplug_handler(dev) {
        /* eventually do unplug stuff */
        bus_unplug_handler(dev) -> calls unrealize(dev)
        /* we can do more unplug stuff but device already unrealized */
    }
object_unparent(dev)

In the long run, every unplug action should be factored out of the
unrealize() function into the unplug handler (especially for PCI). Then
we can get rid of the additonal unrealize() calls and object_unparent()
will properly unrealize the device hierarchy after the device has been
unplugged.

hotplug_handler_unplug(dev) -> calls machine_unplug_handler()
    machine_unplug_handler(dev) {
        /* eventually do unplug stuff */
        bus_unplug_handler(dev) -> only unplugs, does not unrealize
        /* we can do more unplug stuff */
    }
object_unparent(dev) -> will unrealize

The original approach was suggested by Igor Mammedov for the PCI
part, but I extended it to all hotplug handlers. I consider this one
step into the right direction.

To summarize:
- object_unparent() on synchronous unplugs is done by common code
-- "Caller of hotplug_handler_unplug"
- object_unparent() on asynchronous unplugs ("unplug requests") has to
  be done manually
-- "Caller of hotplug_handler_unplug"

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190228122849.4296-2-david@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2019-03-06 11:51:08 -03:00

989 lines
27 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 "qemu/osdep.h"
#include "hw/qdev.h"
#include "hw/sysbus.h"
#include "monitor/monitor.h"
#include "monitor/qdev.h"
#include "sysemu/arch_init.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-misc.h"
#include "qapi/qmp/qdict.h"
#include "qapi/qmp/qerror.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/help_option.h"
#include "qemu/option.h"
#include "sysemu/block-backend.h"
#include "migration/misc.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;
/* Please keep this table sorted by typename. */
static const QDevAlias qdev_alias_table[] = {
{ "e1000", "e1000-82540em" },
{ "ich9-ahci", "ahci" },
{ "lsi53c895a", "lsi" },
{ "virtio-9p-ccw", "virtio-9p", QEMU_ARCH_S390X },
{ "virtio-9p-pci", "virtio-9p", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-balloon-ccw", "virtio-balloon", QEMU_ARCH_S390X },
{ "virtio-balloon-pci", "virtio-balloon",
QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-blk-ccw", "virtio-blk", QEMU_ARCH_S390X },
{ "virtio-blk-pci", "virtio-blk", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-gpu-ccw", "virtio-gpu", QEMU_ARCH_S390X },
{ "virtio-gpu-pci", "virtio-gpu", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-input-host-ccw", "virtio-input-host", QEMU_ARCH_S390X },
{ "virtio-input-host-pci", "virtio-input-host",
QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-keyboard-ccw", "virtio-keyboard", QEMU_ARCH_S390X },
{ "virtio-keyboard-pci", "virtio-keyboard",
QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-mouse-ccw", "virtio-mouse", QEMU_ARCH_S390X },
{ "virtio-mouse-pci", "virtio-mouse", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-net-ccw", "virtio-net", QEMU_ARCH_S390X },
{ "virtio-net-pci", "virtio-net", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-rng-ccw", "virtio-rng", QEMU_ARCH_S390X },
{ "virtio-rng-pci", "virtio-rng", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-scsi-ccw", "virtio-scsi", QEMU_ARCH_S390X },
{ "virtio-scsi-pci", "virtio-scsi", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-serial-ccw", "virtio-serial", QEMU_ARCH_S390X },
{ "virtio-serial-pci", "virtio-serial", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ "virtio-tablet-ccw", "virtio-tablet", QEMU_ARCH_S390X },
{ "virtio-tablet-pci", "virtio-tablet", QEMU_ARCH_ALL & ~QEMU_ARCH_S390X },
{ }
};
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 out_printf(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
monitor_vfprintf(stdout, fmt, ap);
va_end(ap);
}
static void qdev_print_devinfo(DeviceClass *dc)
{
out_printf("name \"%s\"", object_class_get_name(OBJECT_CLASS(dc)));
if (dc->bus_type) {
out_printf(", bus %s", dc->bus_type);
}
if (qdev_class_has_alias(dc)) {
out_printf(", alias \"%s\"", qdev_class_get_alias(dc));
}
if (dc->desc) {
out_printf(", desc \"%s\"", dc->desc);
}
if (!dc->user_creatable) {
out_printf(", no-user");
}
out_printf("\n");
}
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_CPU] = "CPU",
[DEVICE_CATEGORY_MAX] = "Uncategorized",
};
GSList *list, *elt;
int i;
bool cat_printed;
list = object_class_get_list_sorted(TYPE_DEVICE, false);
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->user_creatable)) {
continue;
}
if (!cat_printed) {
out_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(void *opaque, const char *name, const char *value,
Error **errp)
{
Object *obj = opaque;
Error *err = NULL;
if (strcmp(name, "driver") == 0)
return 0;
if (strcmp(name, "bus") == 0)
return 0;
object_property_parse(obj, value, name, &err);
if (err != NULL) {
error_propagate(errp, 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;
}
static DeviceClass *qdev_get_device_class(const char **driver, Error **errp)
{
ObjectClass *oc;
DeviceClass *dc;
const char *original_name = *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)) {
if (*driver != original_name) {
error_setg(errp, "'%s' (alias '%s') is not a valid device model"
" name", original_name, *driver);
} else {
error_setg(errp, "'%s' is not a valid device model name", *driver);
}
return NULL;
}
if (object_class_is_abstract(oc)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
"non-abstract device type");
return NULL;
}
dc = DEVICE_CLASS(oc);
if (!dc->user_creatable ||
(qdev_hotplug && !dc->hotpluggable)) {
error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "driver",
"pluggable device type");
return NULL;
}
return dc;
}
int qdev_device_help(QemuOpts *opts)
{
Error *local_err = NULL;
const char *driver;
ObjectPropertyInfoList *prop_list;
ObjectPropertyInfoList *prop;
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;
}
if (!object_class_by_name(driver)) {
const char *typename = find_typename_by_alias(driver);
if (typename) {
driver = typename;
}
}
prop_list = qmp_device_list_properties(driver, &local_err);
if (local_err) {
goto error;
}
if (prop_list) {
out_printf("%s options:\n", driver);
} else {
out_printf("There are no options for %s.\n", driver);
}
for (prop = prop_list; prop; prop = prop->next) {
int len;
out_printf(" %s=<%s>%n", prop->value->name, prop->value->type, &len);
if (prop->value->has_description) {
if (len < 24) {
out_printf("%*s", 24 - len, "");
}
out_printf(" - %s\n", prop->value->description);
} else {
out_printf("\n");
}
}
qapi_free_ObjectPropertyInfoList(prop_list);
return 1;
error:
error_report_err(local_err);
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, Error **errp)
{
BusState *child;
const char *sep = " ";
error_append_hint(errp, "child buses at \"%s\":",
dev->id ? dev->id : object_get_typename(OBJECT(dev)));
QLIST_FOREACH(child, &dev->child_bus, sibling) {
error_append_hint(errp, "%s\"%s\"", sep, child->name);
sep = ", ";
}
error_append_hint(errp, "\n");
}
static void qbus_list_dev(BusState *bus, Error **errp)
{
BusChild *kid;
const char *sep = " ";
error_append_hint(errp, "devices at \"%s\":", bus->name);
QTAILQ_FOREACH(kid, &bus->children, sibling) {
DeviceState *dev = kid->child;
error_append_hint(errp, "%s\"%s\"", sep,
object_get_typename(OBJECT(dev)));
if (dev->id) {
error_append_hint(errp, "/\"%s\"", dev->id);
}
sep = ", ";
}
error_append_hint(errp, "\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 inline bool qbus_is_full(BusState *bus)
{
BusClass *bus_class = BUS_GET_CLASS(bus);
return bus_class->max_dev && bus->num_children >= bus_class->max_dev;
}
/*
* Search the tree rooted at @bus for a bus.
* If @name, search for a bus with that name. Note that bus names
* need not be unique. Yes, that's screwed up.
* Else search for a bus that is a subtype of @bus_typename.
* If more than one exists, prefer one that can take another device.
* Return the bus if found, else %NULL.
*/
static BusState *qbus_find_recursive(BusState *bus, const char *name,
const char *bus_typename)
{
BusChild *kid;
BusState *pick, *child, *ret;
bool match;
assert(name || bus_typename);
if (name) {
match = !strcmp(bus->name, name);
} else {
match = !!object_dynamic_cast(OBJECT(bus), bus_typename);
}
if (match && !qbus_is_full(bus)) {
return bus; /* root matches and isn't full */
}
pick = match ? bus : NULL;
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 && !qbus_is_full(ret)) {
return ret; /* a descendant matches and isn't full */
}
if (ret && !pick) {
pick = ret;
}
}
}
/* root or a descendant matches, but is full */
return pick;
}
static BusState *qbus_find(const char *path, Error **errp)
{
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) {
error_setg(errp, "Bus '%s' not found", elem);
return NULL;
}
pos = len;
}
for (;;) {
assert(path[pos] == '/' || !path[pos]);
while (path[pos] == '/') {
pos++;
}
if (path[pos] == '\0') {
break;
}
/* 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) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", elem);
qbus_list_dev(bus, errp);
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 */
if (dev->num_child_bus == 1) {
bus = QLIST_FIRST(&dev->child_bus);
break;
}
if (dev->num_child_bus) {
error_setg(errp, "Device '%s' has multiple child buses",
elem);
qbus_list_bus(dev, errp);
} else {
error_setg(errp, "Device '%s' has no child bus", elem);
}
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) {
error_setg(errp, "Bus '%s' not found", elem);
qbus_list_bus(dev, errp);
return NULL;
}
}
if (qbus_is_full(bus)) {
error_setg(errp, "Bus '%s' is full", path);
return NULL;
}
return bus;
}
void qdev_set_id(DeviceState *dev, const char *id)
{
if (id) {
dev->id = id;
}
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);
}
}
DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
{
DeviceClass *dc;
const char *driver, *path;
DeviceState *dev;
BusState *bus = NULL;
Error *err = NULL;
driver = qemu_opt_get(opts, "driver");
if (!driver) {
error_setg(errp, QERR_MISSING_PARAMETER, "driver");
return NULL;
}
/* find driver */
dc = qdev_get_device_class(&driver, errp);
if (!dc) {
return NULL;
}
/* find bus */
path = qemu_opt_get(opts, "bus");
if (path != NULL) {
bus = qbus_find(path, errp);
if (!bus) {
return NULL;
}
if (!object_dynamic_cast(OBJECT(bus), dc->bus_type)) {
error_setg(errp, "Device '%s' can't go on %s bus",
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 || qbus_is_full(bus)) {
error_setg(errp, "No '%s' bus found for device '%s'",
dc->bus_type, driver);
return NULL;
}
}
if (qdev_hotplug && bus && !qbus_is_hotpluggable(bus)) {
error_setg(errp, QERR_BUS_NO_HOTPLUG, bus->name);
return NULL;
}
if (!migration_is_idle()) {
error_setg(errp, "device_add not allowed while migrating");
return NULL;
}
/* create device */
dev = DEVICE(object_new(driver));
if (bus) {
qdev_set_parent_bus(dev, bus);
} else if (qdev_hotplug && !qdev_get_machine_hotplug_handler(dev)) {
/* No bus, no machine hotplug handler --> device is not hotpluggable */
error_setg(&err, "Device '%s' can not be hotplugged on this machine",
driver);
goto err_del_dev;
}
qdev_set_id(dev, qemu_opts_id(opts));
/* set properties */
if (qemu_opt_foreach(opts, set_property, dev, &err)) {
goto err_del_dev;
}
dev->opts = opts;
object_property_set_bool(OBJECT(dev), true, "realized", &err);
if (err != NULL) {
dev->opts = NULL;
goto err_del_dev;
}
return dev;
err_del_dev:
error_propagate(errp, err);
object_unparent(OBJECT(dev));
object_unref(OBJECT(dev));
return NULL;
}
#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, true, &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;
NamedGPIOList *ngl;
qdev_printf("dev: %s, id \"%s\"\n", object_get_typename(OBJECT(dev)),
dev->id ? dev->id : "");
indent += 2;
QLIST_FOREACH(ngl, &dev->gpios, node) {
if (ngl->num_in) {
qdev_printf("gpio-in \"%s\" %d\n", ngl->name ? ngl->name : "",
ngl->num_in);
}
if (ngl->num_out) {
qdev_printf("gpio-out \"%s\" %d\n", ngl->name ? ngl->name : "",
ngl->num_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 hmp_info_qtree(Monitor *mon, const QDict *qdict)
{
if (sysbus_get_default())
qbus_print(mon, sysbus_get_default(), 0);
}
void hmp_info_qdm(Monitor *mon, const QDict *qdict)
{
qdev_print_devinfos(true);
}
typedef struct QOMCompositionState {
Monitor *mon;
int indent;
} QOMCompositionState;
static void print_qom_composition(Monitor *mon, Object *obj, int indent);
static int print_qom_composition_child(Object *obj, void *opaque)
{
QOMCompositionState *s = opaque;
print_qom_composition(s->mon, obj, s->indent);
return 0;
}
static void print_qom_composition(Monitor *mon, Object *obj, int indent)
{
QOMCompositionState s = {
.mon = mon,
.indent = indent + 2,
};
char *name;
if (obj == object_get_root()) {
name = g_strdup("");
} else {
name = object_get_canonical_path_component(obj);
}
monitor_printf(mon, "%*s/%s (%s)\n", indent, "", name,
object_get_typename(obj));
g_free(name);
object_child_foreach(obj, print_qom_composition_child, &s);
}
void hmp_info_qom_tree(Monitor *mon, const QDict *dict)
{
const char *path = qdict_get_try_str(dict, "path");
Object *obj;
bool ambiguous = false;
if (path) {
obj = object_resolve_path(path, &ambiguous);
if (!obj) {
monitor_printf(mon, "Path '%s' could not be resolved.\n", path);
return;
}
if (ambiguous) {
monitor_printf(mon, "Warning: Path '%s' is ambiguous.\n", path);
return;
}
} else {
obj = qdev_get_machine();
}
print_qom_composition(mon, obj, 0);
}
void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
{
Error *local_err = NULL;
QemuOpts *opts;
DeviceState *dev;
opts = qemu_opts_from_qdict(qemu_find_opts("device"), qdict, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (!monitor_cur_is_qmp() && qdev_device_help(opts)) {
qemu_opts_del(opts);
return;
}
dev = qdev_device_add(opts, &local_err);
if (!dev) {
error_propagate(errp, local_err);
qemu_opts_del(opts);
return;
}
object_unref(OBJECT(dev));
}
static DeviceState *find_device_state(const char *id, Error **errp)
{
Object *obj;
if (id[0] == '/') {
obj = object_resolve_path(id, NULL);
} else {
char *root_path = object_get_canonical_path(qdev_get_peripheral());
char *path = g_strdup_printf("%s/%s", root_path, id);
g_free(root_path);
obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
g_free(path);
}
if (!obj) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", id);
return NULL;
}
if (!object_dynamic_cast(obj, TYPE_DEVICE)) {
error_setg(errp, "%s is not a hotpluggable device", id);
return NULL;
}
return DEVICE(obj);
}
void qdev_unplug(DeviceState *dev, Error **errp)
{
DeviceClass *dc = DEVICE_GET_CLASS(dev);
HotplugHandler *hotplug_ctrl;
HotplugHandlerClass *hdc;
Error *local_err = NULL;
if (dev->parent_bus && !qbus_is_hotpluggable(dev->parent_bus)) {
error_setg(errp, QERR_BUS_NO_HOTPLUG, dev->parent_bus->name);
return;
}
if (!dc->hotpluggable) {
error_setg(errp, QERR_DEVICE_NO_HOTPLUG,
object_get_typename(OBJECT(dev)));
return;
}
if (!migration_is_idle()) {
error_setg(errp, "device_del not allowed while migrating");
return;
}
qdev_hot_removed = true;
hotplug_ctrl = qdev_get_hotplug_handler(dev);
/* hotpluggable device MUST have HotplugHandler, if it doesn't
* then something is very wrong with it */
g_assert(hotplug_ctrl);
/* If device supports async unplug just request it to be done,
* otherwise just remove it synchronously */
hdc = HOTPLUG_HANDLER_GET_CLASS(hotplug_ctrl);
if (hdc->unplug_request) {
hotplug_handler_unplug_request(hotplug_ctrl, dev, &local_err);
} else {
hotplug_handler_unplug(hotplug_ctrl, dev, &local_err);
if (!local_err) {
object_unparent(OBJECT(dev));
}
}
error_propagate(errp, local_err);
}
void qmp_device_del(const char *id, Error **errp)
{
DeviceState *dev = find_device_state(id, errp);
if (dev != NULL) {
qdev_unplug(dev, errp);
}
}
BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
{
DeviceState *dev;
BlockBackend *blk;
dev = find_device_state(id, errp);
if (dev == NULL) {
return NULL;
}
blk = blk_by_dev(dev);
if (!blk) {
error_setg(errp, "Device does not have a block device backend");
}
return blk;
}
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] == '=') {
opts = qemu_opts_create(&qemu_global_opts, NULL, 0, &error_abort);
qemu_opt_set(opts, "driver", driver, &error_abort);
qemu_opt_set(opts, "property", property, &error_abort);
qemu_opt_set(opts, "value", str + offset + 1, &error_abort);
return 0;
}
opts = qemu_opts_parse_noisily(&qemu_global_opts, str, false);
if (!opts) {
return -1;
}
return 0;
}