qdev: bus walker + qdev_device_add()
This patch implements a parser and qdev tree walker for bus paths and
adds qdev_device_add on top of this.
A bus path can be:
(1) full path, i.e. /i440FX-pcihost/pci.0/lsi/scsi.0
(2) bus name, i.e. "scsi.0". Best used together with id= to make
sure this is unique.
(3) relative path starting with a bus name, i.e. "pci.0/lsi/scsi.0"
For the (common) case of a single child bus being attached to a device
it is enougth to specify the device only, i.e. "pci.0/lsi" will be
accepted too.
qdev_device_add() adds devices and accepts bus= parameters to find the
bus the device should be attached to. Without bus= being specified it
takes the first bus it finds where the device can be attached to (i.e.
first pci bus for pci devices, ...).
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gerd Hoffmann
Anthony Liguori
parent
d271de9f1b
commit
8ffb1bcf56
251
hw/qdev.c
251
hw/qdev.c
@ -35,6 +35,10 @@ static BusState *main_system_bus;
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static 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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@ -101,6 +105,80 @@ DeviceState *qdev_create(BusState *bus, const char *name)
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return dev;
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}
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DeviceState *qdev_device_add(const char *cmdline)
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{
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DeviceInfo *info;
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DeviceState *qdev;
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BusState *bus;
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char driver[32], path[128] = "";
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char tag[32], value[256];
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const char *params = NULL;
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int n = 0;
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if (1 != sscanf(cmdline, "%32[^,],%n", driver, &n)) {
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fprintf(stderr, "device parse error: \"%s\"\n", cmdline);
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return NULL;
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}
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if (strcmp(driver, "?") == 0) {
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for (info = device_info_list; info != NULL; info = info->next) {
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fprintf(stderr, "name \"%s\", bus %s\n", info->name, info->bus_info->name);
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}
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return NULL;
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}
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if (n) {
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params = cmdline + n;
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get_param_value(path, sizeof(path), "bus", params);
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}
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info = qdev_find_info(NULL, driver);
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if (!info) {
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fprintf(stderr, "Device \"%s\" not found. Try -device '?' for a list.\n",
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driver);
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return NULL;
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}
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if (info->no_user) {
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fprintf(stderr, "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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if (strlen(path)) {
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bus = qbus_find(path);
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if (!bus)
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return NULL;
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qdev = qdev_create(bus, driver);
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} else {
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bus = qbus_find_recursive(main_system_bus, NULL, info->bus_info);
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if (!bus)
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return NULL;
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qdev = qdev_create(bus, driver);
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}
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if (params) {
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while (params[0]) {
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if (2 != sscanf(params, "%31[^=]=%255[^,]%n", tag, value, &n)) {
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fprintf(stderr, "parse error at \"%s\"\n", params);
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break;
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}
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params += n;
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if (params[0] == ',')
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params++;
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if (strcmp(tag, "bus") == 0)
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continue;
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if (strcmp(tag, "id") == 0) {
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qdev->id = qemu_strdup(value);
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continue;
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}
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if (-1 == qdev_prop_parse(qdev, tag, value)) {
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fprintf(stderr, "can't set property \"%s\" to \"%s\" for \"%s\"\n",
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tag, value, driver);
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}
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}
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}
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qdev_init(qdev);
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return qdev;
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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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@ -229,6 +307,179 @@ void scsi_bus_new(DeviceState *host, SCSIAttachFn attach)
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}
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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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LIST_FOREACH(dev, &bus->children, sibling) {
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LIST_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 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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LIST_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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LIST_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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LIST_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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LIST_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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LIST_FOREACH(dev, &bus->children, sibling) {
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if (strcmp(dev->info->name, elem) == 0) {
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return dev;
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}
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}
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LIST_FOREACH(dev, &bus->children, sibling) {
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if (dev->info->alias && strcmp(dev->info->alias, elem) == 0) {
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return dev;
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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(const char *path)
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{
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DeviceState *dev;
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BusState *bus;
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char elem[128], msg[256];
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int pos, len;
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/* find start element */
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if (path[0] == '/') {
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bus = main_system_bus;
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pos = 0;
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} else {
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if (sscanf(path, "%127[^/]%n", elem, &len) != 1) {
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fprintf(stderr, "path parse error (\"%s\")\n", path);
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return NULL;
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}
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bus = qbus_find_recursive(main_system_bus, elem, NULL);
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if (!bus) {
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fprintf(stderr, "bus \"%s\" not found\n", elem);
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return NULL;
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}
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pos = len;
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}
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for (;;) {
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if (path[pos] == '\0') {
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/* we are done */
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return bus;
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}
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/* find device */
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if (sscanf(path+pos, "/%127[^/]%n", elem, &len) != 1) {
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fprintf(stderr, "path parse error (\"%s\" pos %d)\n", path, pos);
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return NULL;
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}
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pos += len;
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dev = qbus_find_dev(bus, elem);
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if (!dev) {
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qbus_list_dev(bus, msg, sizeof(msg));
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fprintf(stderr, "device \"%s\" not found\n%s\n", elem, msg);
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return NULL;
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}
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if (path[pos] == '\0') {
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/* last specified element is a device. If it has exactly
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* one child bus accept it nevertheless */
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switch (dev->num_child_bus) {
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case 0:
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fprintf(stderr, "device has no child bus (%s)\n", path);
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return NULL;
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case 1:
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return LIST_FIRST(&dev->child_bus);
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default:
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qbus_list_bus(dev, msg, sizeof(msg));
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fprintf(stderr, "device has multiple child busses (%s)\n%s\n",
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path, msg);
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return NULL;
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}
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}
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/* find bus */
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if (sscanf(path+pos, "/%127[^/]%n", elem, &len) != 1) {
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fprintf(stderr, "path parse error (\"%s\" pos %d)\n", path, pos);
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return NULL;
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}
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pos += len;
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bus = qbus_find_bus(dev, elem);
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if (!bus) {
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qbus_list_bus(dev, msg, sizeof(msg));
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fprintf(stderr, "child bus \"%s\" not found\n%s\n", elem, msg);
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return NULL;
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}
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}
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}
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BusState *qbus_create(BusInfo *info, DeviceState *parent, const char *name)
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{
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BusState *bus;
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@ -82,6 +82,7 @@ struct CompatProperty {
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/*** Board API. This should go away once we have a machine config file. ***/
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DeviceState *qdev_create(BusState *bus, const char *name);
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DeviceState *qdev_device_add(const char *cmdline);
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void qdev_init(DeviceState *dev);
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void qdev_free(DeviceState *dev);
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