08350cf06a
Option "-device DRIVER,?" and monitor command "device_add DRIVER,?"
print the supported properties instead of creating a device. The
former also terminates the program.
This is commit 2ba6edf0 (just reverted) done right.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
768 lines
20 KiB
C
768 lines
20 KiB
C
/*
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* Dynamic device configuration and creation.
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*
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* Copyright (c) 2009 CodeSourcery
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* The theory here is that it should be possible to create a machine without
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knowledge of specific devices. Historically board init routines have
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passed a bunch of arguments to each device, requiring the board know
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exactly which device it is dealing with. This file provides an abstract
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API for device configuration and initialization. Devices will generally
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inherit from a particular bus (e.g. PCI or I2C) rather than
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this API directly. */
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#include "net.h"
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#include "qdev.h"
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#include "sysemu.h"
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#include "monitor.h"
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#include "qerror.h"
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static int qdev_hotplug = 0;
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/* This is a nasty hack to allow passing a NULL bus to qdev_create. */
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static BusState *main_system_bus;
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DeviceInfo *device_info_list;
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static BusState *qbus_find_recursive(BusState *bus, const char *name,
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const BusInfo *info);
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static BusState *qbus_find(const char *path);
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/* Register a new device type. */
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void qdev_register(DeviceInfo *info)
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{
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assert(info->size >= sizeof(DeviceState));
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assert(!info->next);
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info->next = device_info_list;
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device_info_list = info;
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}
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static DeviceInfo *qdev_find_info(BusInfo *bus_info, const char *name)
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{
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DeviceInfo *info;
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/* first check device names */
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for (info = device_info_list; info != NULL; info = info->next) {
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if (bus_info && info->bus_info != bus_info)
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continue;
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if (strcmp(info->name, name) != 0)
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continue;
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return info;
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}
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/* failing that check the aliases */
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for (info = device_info_list; info != NULL; info = info->next) {
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if (bus_info && info->bus_info != bus_info)
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continue;
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if (!info->alias)
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continue;
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if (strcmp(info->alias, name) != 0)
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continue;
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return info;
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}
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return NULL;
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}
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/* Create a new device. This only initializes the device state structure
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and allows properties to be set. qdev_init should be called to
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initialize the actual device emulation. */
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DeviceState *qdev_create(BusState *bus, const char *name)
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{
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DeviceInfo *info;
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DeviceState *dev;
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if (!bus) {
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if (!main_system_bus) {
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main_system_bus = qbus_create(&system_bus_info, NULL, "main-system-bus");
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}
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bus = main_system_bus;
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}
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info = qdev_find_info(bus->info, name);
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if (!info) {
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hw_error("Unknown device '%s' for bus '%s'\n", name, bus->info->name);
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}
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dev = qemu_mallocz(info->size);
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dev->info = info;
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dev->parent_bus = bus;
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qdev_prop_set_defaults(dev, dev->info->props);
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qdev_prop_set_defaults(dev, dev->parent_bus->info->props);
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qdev_prop_set_globals(dev);
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QLIST_INSERT_HEAD(&bus->children, dev, sibling);
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if (qdev_hotplug) {
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assert(bus->allow_hotplug);
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dev->hotplugged = 1;
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}
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dev->state = DEV_STATE_CREATED;
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return dev;
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}
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static int qdev_print_devinfo(DeviceInfo *info, char *dest, int len)
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{
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int pos = 0;
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int ret;
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ret = snprintf(dest+pos, len-pos, "name \"%s\", bus %s",
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info->name, info->bus_info->name);
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pos += MIN(len-pos,ret);
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if (info->alias) {
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ret = snprintf(dest+pos, len-pos, ", alias \"%s\"", info->alias);
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pos += MIN(len-pos,ret);
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}
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if (info->desc) {
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ret = snprintf(dest+pos, len-pos, ", desc \"%s\"", info->desc);
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pos += MIN(len-pos,ret);
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}
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if (info->no_user) {
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ret = snprintf(dest+pos, len-pos, ", no-user");
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pos += MIN(len-pos,ret);
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}
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return pos;
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}
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static int set_property(const char *name, const char *value, void *opaque)
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{
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DeviceState *dev = opaque;
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if (strcmp(name, "driver") == 0)
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return 0;
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if (strcmp(name, "bus") == 0)
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return 0;
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if (qdev_prop_parse(dev, name, value) == -1) {
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qemu_error("can't set property \"%s\" to \"%s\" for \"%s\"\n",
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name, value, dev->info->name);
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return -1;
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}
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return 0;
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}
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int qdev_device_help(QemuOpts *opts)
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{
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const char *driver;
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DeviceInfo *info;
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char msg[256];
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Property *prop;
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driver = qemu_opt_get(opts, "driver");
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if (driver && !strcmp(driver, "?")) {
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for (info = device_info_list; info != NULL; info = info->next) {
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qdev_print_devinfo(info, msg, sizeof(msg));
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qemu_error("%s\n", msg);
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}
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return 1;
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}
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if (!qemu_opt_get(opts, "?")) {
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return 0;
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}
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info = qdev_find_info(NULL, driver);
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if (!info) {
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return 0;
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}
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for (prop = info->props; prop && prop->name; prop++) {
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qemu_error("%s.%s\n", info->name, prop->name);
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}
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return 1;
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}
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DeviceState *qdev_device_add(QemuOpts *opts)
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{
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const char *driver, *path, *id;
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DeviceInfo *info;
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DeviceState *qdev;
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BusState *bus;
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driver = qemu_opt_get(opts, "driver");
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if (!driver) {
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qemu_error("-device: no driver specified\n");
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return NULL;
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}
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/* find driver */
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info = qdev_find_info(NULL, driver);
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if (!info) {
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qemu_error_new(QERR_DEVICE_NOT_FOUND, driver);
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return NULL;
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}
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if (info->no_user) {
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qemu_error("device \"%s\" can't be added via command line\n",
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info->name);
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return NULL;
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}
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/* find bus */
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path = qemu_opt_get(opts, "bus");
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if (path != NULL) {
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bus = qbus_find(path);
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} else {
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bus = qbus_find_recursive(main_system_bus, NULL, info->bus_info);
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}
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if (!bus) {
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qemu_error("Did not find %s bus for %s\n",
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path ? path : info->bus_info->name, info->name);
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return NULL;
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}
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if (qdev_hotplug && !bus->allow_hotplug) {
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qemu_error("Bus %s does not support hotplugging\n",
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bus->name);
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return NULL;
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}
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/* create device, set properties */
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qdev = qdev_create(bus, driver);
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id = qemu_opts_id(opts);
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if (id) {
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qdev->id = id;
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}
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if (qemu_opt_foreach(opts, set_property, qdev, 1) != 0) {
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qdev_free(qdev);
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return NULL;
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}
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if (qdev_init(qdev) < 0) {
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qemu_error("Error initializing device %s\n", driver);
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return NULL;
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}
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qdev->opts = opts;
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return qdev;
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}
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static void qdev_reset(void *opaque)
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{
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DeviceState *dev = opaque;
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if (dev->info->reset)
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dev->info->reset(dev);
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}
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/* Initialize a device. Device properties should be set before calling
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this function. IRQs and MMIO regions should be connected/mapped after
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calling this function.
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On failure, destroy the device and return negative value.
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Return 0 on success. */
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int qdev_init(DeviceState *dev)
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{
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int rc;
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assert(dev->state == DEV_STATE_CREATED);
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rc = dev->info->init(dev, dev->info);
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if (rc < 0) {
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qdev_free(dev);
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return rc;
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}
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qemu_register_reset(qdev_reset, dev);
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if (dev->info->vmsd)
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vmstate_register(-1, dev->info->vmsd, dev);
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dev->state = DEV_STATE_INITIALIZED;
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return 0;
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}
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int qdev_unplug(DeviceState *dev)
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{
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if (!dev->parent_bus->allow_hotplug) {
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qemu_error("Bus %s does not support hotplugging\n",
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dev->parent_bus->name);
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return -1;
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}
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assert(dev->info->unplug != NULL);
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return dev->info->unplug(dev);
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}
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/* can be used as ->unplug() callback for the simple cases */
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int qdev_simple_unplug_cb(DeviceState *dev)
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{
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/* just zap it */
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qdev_free(dev);
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return 0;
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}
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/* Like qdev_init(), but terminate program via hw_error() instead of
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returning an error value. This is okay during machine creation.
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Don't use for hotplug, because there callers need to recover from
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failure. Exception: if you know the device's init() callback can't
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fail, then qdev_init_nofail() can't fail either, and is therefore
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usable even then. But relying on the device implementation that
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way is somewhat unclean, and best avoided. */
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void qdev_init_nofail(DeviceState *dev)
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{
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DeviceInfo *info = dev->info;
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if (qdev_init(dev) < 0)
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hw_error("Initialization of device %s failed\n", info->name);
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}
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/* Unlink device from bus and free the structure. */
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void qdev_free(DeviceState *dev)
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{
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BusState *bus;
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if (dev->state == DEV_STATE_INITIALIZED) {
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while (dev->num_child_bus) {
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bus = QLIST_FIRST(&dev->child_bus);
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qbus_free(bus);
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}
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if (dev->info->vmsd)
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vmstate_unregister(dev->info->vmsd, dev);
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if (dev->info->exit)
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dev->info->exit(dev);
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if (dev->opts)
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qemu_opts_del(dev->opts);
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}
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qemu_unregister_reset(qdev_reset, dev);
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QLIST_REMOVE(dev, sibling);
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qemu_free(dev);
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}
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void qdev_machine_creation_done(void)
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{
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/*
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* ok, initial machine setup is done, starting from now we can
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* only create hotpluggable devices
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*/
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qdev_hotplug = 1;
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}
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/* Get a character (serial) device interface. */
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CharDriverState *qdev_init_chardev(DeviceState *dev)
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{
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static int next_serial;
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/* FIXME: This function needs to go away: use chardev properties! */
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return serial_hds[next_serial++];
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}
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BusState *qdev_get_parent_bus(DeviceState *dev)
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{
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return dev->parent_bus;
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}
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void qdev_init_gpio_in(DeviceState *dev, qemu_irq_handler handler, int n)
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{
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assert(dev->num_gpio_in == 0);
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dev->num_gpio_in = n;
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dev->gpio_in = qemu_allocate_irqs(handler, dev, n);
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}
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void qdev_init_gpio_out(DeviceState *dev, qemu_irq *pins, int n)
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{
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assert(dev->num_gpio_out == 0);
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dev->num_gpio_out = n;
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dev->gpio_out = pins;
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}
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qemu_irq qdev_get_gpio_in(DeviceState *dev, int n)
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{
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assert(n >= 0 && n < dev->num_gpio_in);
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return dev->gpio_in[n];
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}
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void qdev_connect_gpio_out(DeviceState * dev, int n, qemu_irq pin)
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{
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assert(n >= 0 && n < dev->num_gpio_out);
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dev->gpio_out[n] = pin;
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}
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void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd)
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{
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qdev_prop_set_macaddr(dev, "mac", nd->macaddr);
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if (nd->vlan)
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qdev_prop_set_vlan(dev, "vlan", nd->vlan);
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if (nd->netdev)
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qdev_prop_set_netdev(dev, "netdev", nd->netdev);
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if (nd->nvectors != NIC_NVECTORS_UNSPECIFIED &&
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qdev_prop_exists(dev, "vectors")) {
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qdev_prop_set_uint32(dev, "vectors", nd->nvectors);
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}
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}
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static int next_block_unit[IF_COUNT];
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/* Get a block device. This should only be used for single-drive devices
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(e.g. SD/Floppy/MTD). Multi-disk devices (scsi/ide) should use the
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appropriate bus. */
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BlockDriverState *qdev_init_bdrv(DeviceState *dev, BlockInterfaceType type)
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{
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int unit = next_block_unit[type]++;
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DriveInfo *dinfo;
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dinfo = drive_get(type, 0, unit);
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return dinfo ? dinfo->bdrv : NULL;
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}
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BusState *qdev_get_child_bus(DeviceState *dev, const char *name)
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{
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BusState *bus;
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QLIST_FOREACH(bus, &dev->child_bus, sibling) {
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if (strcmp(name, bus->name) == 0) {
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return bus;
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}
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}
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return NULL;
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}
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static BusState *qbus_find_recursive(BusState *bus, const char *name,
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const BusInfo *info)
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{
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DeviceState *dev;
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BusState *child, *ret;
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int match = 1;
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if (name && (strcmp(bus->name, name) != 0)) {
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match = 0;
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}
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if (info && (bus->info != info)) {
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match = 0;
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}
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if (match) {
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return bus;
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}
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QLIST_FOREACH(dev, &bus->children, sibling) {
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QLIST_FOREACH(child, &dev->child_bus, sibling) {
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ret = qbus_find_recursive(child, name, info);
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if (ret) {
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return ret;
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}
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}
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}
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return NULL;
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}
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static DeviceState *qdev_find_recursive(BusState *bus, const char *id)
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{
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DeviceState *dev, *ret;
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BusState *child;
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QLIST_FOREACH(dev, &bus->children, sibling) {
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if (dev->id && strcmp(dev->id, id) == 0)
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return dev;
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QLIST_FOREACH(child, &dev->child_bus, sibling) {
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ret = qdev_find_recursive(child, id);
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if (ret) {
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return ret;
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}
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}
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}
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return NULL;
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}
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static void qbus_list_bus(DeviceState *dev, char *dest, int len)
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{
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BusState *child;
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const char *sep = " ";
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int pos = 0;
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pos += snprintf(dest+pos, len-pos,"child busses at \"%s\":",
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dev->id ? dev->id : dev->info->name);
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QLIST_FOREACH(child, &dev->child_bus, sibling) {
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pos += snprintf(dest+pos, len-pos, "%s\"%s\"", sep, child->name);
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sep = ", ";
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}
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}
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static void qbus_list_dev(BusState *bus, char *dest, int len)
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{
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DeviceState *dev;
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const char *sep = " ";
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int pos = 0;
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pos += snprintf(dest+pos, len-pos, "devices at \"%s\":",
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bus->name);
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QLIST_FOREACH(dev, &bus->children, sibling) {
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pos += snprintf(dest+pos, len-pos, "%s\"%s\"",
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sep, dev->info->name);
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if (dev->id)
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pos += snprintf(dest+pos, len-pos, "/\"%s\"", dev->id);
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sep = ", ";
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}
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}
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static BusState *qbus_find_bus(DeviceState *dev, char *elem)
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{
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BusState *child;
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QLIST_FOREACH(child, &dev->child_bus, sibling) {
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if (strcmp(child->name, elem) == 0) {
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return child;
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}
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}
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return NULL;
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}
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static DeviceState *qbus_find_dev(BusState *bus, char *elem)
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{
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DeviceState *dev;
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/*
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* try to match in order:
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* (1) instance id, if present
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* (2) driver name
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* (3) driver alias, if present
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*/
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QLIST_FOREACH(dev, &bus->children, sibling) {
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if (dev->id && strcmp(dev->id, elem) == 0) {
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return dev;
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}
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}
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QLIST_FOREACH(dev, &bus->children, sibling) {
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if (strcmp(dev->info->name, elem) == 0) {
|
|
return dev;
|
|
}
|
|
}
|
|
QLIST_FOREACH(dev, &bus->children, sibling) {
|
|
if (dev->info->alias && strcmp(dev->info->alias, elem) == 0) {
|
|
return dev;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static BusState *qbus_find(const char *path)
|
|
{
|
|
DeviceState *dev;
|
|
BusState *bus;
|
|
char elem[128], msg[256];
|
|
int pos, len;
|
|
|
|
/* find start element */
|
|
if (path[0] == '/') {
|
|
bus = main_system_bus;
|
|
pos = 0;
|
|
} else {
|
|
if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
|
|
qemu_error("path parse error (\"%s\")\n", path);
|
|
return NULL;
|
|
}
|
|
bus = qbus_find_recursive(main_system_bus, elem, NULL);
|
|
if (!bus) {
|
|
qemu_error("bus \"%s\" not found\n", elem);
|
|
return NULL;
|
|
}
|
|
pos = len;
|
|
}
|
|
|
|
for (;;) {
|
|
if (path[pos] == '\0') {
|
|
/* we are done */
|
|
return bus;
|
|
}
|
|
|
|
/* find device */
|
|
if (sscanf(path+pos, "/%127[^/]%n", elem, &len) != 1) {
|
|
qemu_error("path parse error (\"%s\" pos %d)\n", path, pos);
|
|
return NULL;
|
|
}
|
|
pos += len;
|
|
dev = qbus_find_dev(bus, elem);
|
|
if (!dev) {
|
|
qbus_list_dev(bus, msg, sizeof(msg));
|
|
qemu_error("device \"%s\" not found\n%s\n", elem, msg);
|
|
return NULL;
|
|
}
|
|
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:
|
|
qemu_error("device has no child bus (%s)\n", path);
|
|
return NULL;
|
|
case 1:
|
|
return QLIST_FIRST(&dev->child_bus);
|
|
default:
|
|
qbus_list_bus(dev, msg, sizeof(msg));
|
|
qemu_error("device has multiple child busses (%s)\n%s\n",
|
|
path, msg);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* find bus */
|
|
if (sscanf(path+pos, "/%127[^/]%n", elem, &len) != 1) {
|
|
qemu_error("path parse error (\"%s\" pos %d)\n", path, pos);
|
|
return NULL;
|
|
}
|
|
pos += len;
|
|
bus = qbus_find_bus(dev, elem);
|
|
if (!bus) {
|
|
qbus_list_bus(dev, msg, sizeof(msg));
|
|
qemu_error("child bus \"%s\" not found\n%s\n", elem, msg);
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
void qbus_create_inplace(BusState *bus, BusInfo *info,
|
|
DeviceState *parent, const char *name)
|
|
{
|
|
char *buf;
|
|
int i,len;
|
|
|
|
bus->info = info;
|
|
bus->parent = parent;
|
|
|
|
if (name) {
|
|
/* use supplied name */
|
|
bus->name = qemu_strdup(name);
|
|
} else if (parent && parent->id) {
|
|
/* parent device has id -> use it for bus name */
|
|
len = strlen(parent->id) + 16;
|
|
buf = qemu_malloc(len);
|
|
snprintf(buf, len, "%s.%d", parent->id, parent->num_child_bus);
|
|
bus->name = buf;
|
|
} else {
|
|
/* no id -> use lowercase bus type for bus name */
|
|
len = strlen(info->name) + 16;
|
|
buf = qemu_malloc(len);
|
|
len = snprintf(buf, len, "%s.%d", info->name,
|
|
parent ? parent->num_child_bus : 0);
|
|
for (i = 0; i < len; i++)
|
|
buf[i] = qemu_tolower(buf[i]);
|
|
bus->name = buf;
|
|
}
|
|
|
|
QLIST_INIT(&bus->children);
|
|
if (parent) {
|
|
QLIST_INSERT_HEAD(&parent->child_bus, bus, sibling);
|
|
parent->num_child_bus++;
|
|
}
|
|
|
|
}
|
|
|
|
BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
|
|
{
|
|
BusState *bus;
|
|
|
|
bus = qemu_mallocz(info->size);
|
|
bus->qdev_allocated = 1;
|
|
qbus_create_inplace(bus, info, parent, name);
|
|
return bus;
|
|
}
|
|
|
|
void qbus_free(BusState *bus)
|
|
{
|
|
DeviceState *dev;
|
|
|
|
while ((dev = QLIST_FIRST(&bus->children)) != NULL) {
|
|
qdev_free(dev);
|
|
}
|
|
if (bus->parent) {
|
|
QLIST_REMOVE(bus, sibling);
|
|
bus->parent->num_child_bus--;
|
|
}
|
|
if (bus->qdev_allocated) {
|
|
qemu_free(bus);
|
|
}
|
|
}
|
|
|
|
#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,
|
|
const char *prefix, int indent)
|
|
{
|
|
char buf[64];
|
|
|
|
if (!props)
|
|
return;
|
|
while (props->name) {
|
|
if (props->info->print) {
|
|
props->info->print(dev, props, buf, sizeof(buf));
|
|
qdev_printf("%s-prop: %s = %s\n", prefix, props->name, buf);
|
|
}
|
|
props++;
|
|
}
|
|
}
|
|
|
|
static void qdev_print(Monitor *mon, DeviceState *dev, int indent)
|
|
{
|
|
BusState *child;
|
|
qdev_printf("dev: %s, id \"%s\"\n", dev->info->name,
|
|
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);
|
|
}
|
|
qdev_print_props(mon, dev, dev->info->props, "dev", indent);
|
|
qdev_print_props(mon, dev, dev->parent_bus->info->props, "bus", indent);
|
|
if (dev->parent_bus->info->print_dev)
|
|
dev->parent_bus->info->print_dev(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)
|
|
{
|
|
struct DeviceState *dev;
|
|
|
|
qdev_printf("bus: %s\n", bus->name);
|
|
indent += 2;
|
|
qdev_printf("type %s\n", bus->info->name);
|
|
QLIST_FOREACH(dev, &bus->children, sibling) {
|
|
qdev_print(mon, dev, indent);
|
|
}
|
|
}
|
|
#undef qdev_printf
|
|
|
|
void do_info_qtree(Monitor *mon)
|
|
{
|
|
if (main_system_bus)
|
|
qbus_print(mon, main_system_bus, 0);
|
|
}
|
|
|
|
void do_info_qdm(Monitor *mon)
|
|
{
|
|
DeviceInfo *info;
|
|
char msg[256];
|
|
|
|
for (info = device_info_list; info != NULL; info = info->next) {
|
|
qdev_print_devinfo(info, msg, sizeof(msg));
|
|
monitor_printf(mon, "%s\n", msg);
|
|
}
|
|
}
|
|
|
|
void do_device_add(Monitor *mon, const QDict *qdict)
|
|
{
|
|
QemuOpts *opts;
|
|
|
|
opts = qemu_opts_parse(&qemu_device_opts,
|
|
qdict_get_str(qdict, "config"), "driver");
|
|
if (opts && !qdev_device_help(opts))
|
|
qdev_device_add(opts);
|
|
}
|
|
|
|
void do_device_del(Monitor *mon, const QDict *qdict)
|
|
{
|
|
const char *id = qdict_get_str(qdict, "id");
|
|
DeviceState *dev;
|
|
|
|
dev = qdev_find_recursive(main_system_bus, id);
|
|
if (NULL == dev) {
|
|
qemu_error("Device '%s' not found\n", id);
|
|
return;
|
|
}
|
|
qdev_unplug(dev);
|
|
}
|