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pci: introduce a helper function to convert qdev id to PCIDevice

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This patch introduce a helper function to get PCIDevice from qdev id.
This function will be used later.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Isaku Yamahata 2010-12-24 12:14:13 +09:00 • committed by Michael S. Tsirkin
parent a2ee6b4fcb
commit f3006dd1e6
2 changed files with 36 additions and 0 deletions
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35
hw/pci.c
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@ -2027,3 +2027,38 @@ static char *pcibus_get_dev_path(DeviceState *dev)
return strdup(path);
}
static int pci_qdev_find_recursive(PCIBus *bus,
const char *id, PCIDevice **pdev)
{
DeviceState *qdev = qdev_find_recursive(&bus->qbus, id);
if (!qdev) {
return -ENODEV;
}
/* roughly check if given qdev is pci device */
if (qdev->info->init == &pci_qdev_init &&
qdev->parent_bus->info == &pci_bus_info) {
*pdev = DO_UPCAST(PCIDevice, qdev, qdev);
return 0;
}
return -EINVAL;
}
int pci_qdev_find_device(const char *id, PCIDevice **pdev)
{
struct PCIHostBus *host;
int rc = -ENODEV;
QLIST_FOREACH(host, &host_buses, next) {
int tmp = pci_qdev_find_recursive(host->bus, id, pdev);
if (!tmp) {
rc = 0;
break;
}
if (tmp != -ENODEV) {
rc = tmp;
}
}
return rc;
}