ui: move qemu_spice_fill_device_address to ui/util.c
Other backends can use it.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
diff --git a/ui/util.c b/ui/util.c
new file mode 100644
index 0000000..7e8fc1e
--- /dev/null
+++ b/ui/util.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (C) 2021 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 or
+ * (at your option) version 3 of the License.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
+#include "qapi/error.h"
+#include "ui/console.h"
+
+/*
+ * Recursively (in reverse order) appends addresses of PCI devices as it moves
+ * up in the PCI hierarchy.
+ *
+ * @returns true on success, false when the buffer wasn't large enough
+ */
+static bool append_pci_address(char *buf, size_t buf_size, const PCIDevice *pci)
+{
+ PCIBus *bus = pci_get_bus(pci);
+ /*
+ * equivalent to if (!pci_bus_is_root(bus)), but the function is not built
+ * with PCI_CONFIG=n, avoid using an #ifdef by checking directly
+ */
+ if (bus->parent_dev != NULL) {
+ append_pci_address(buf, buf_size, bus->parent_dev);
+ }
+
+ size_t len = strlen(buf);
+ ssize_t written = snprintf(buf + len, buf_size - len, "/%02x.%x",
+ PCI_SLOT(pci->devfn), PCI_FUNC(pci->devfn));
+
+ return written > 0 && written < buf_size - len;
+}
+
+bool qemu_console_fill_device_address(QemuConsole *con,
+ char *device_address,
+ size_t size,
+ Error **errp)
+{
+ ERRP_GUARD();
+ DeviceState *dev = DEVICE(object_property_get_link(OBJECT(con),
+ "device",
+ &error_abort));
+ PCIDevice *pci = (PCIDevice *) object_dynamic_cast(OBJECT(dev),
+ TYPE_PCI_DEVICE);
+
+ if (pci == NULL) {
+ error_setg(errp, "Setting device address of a display device: "
+ "Not a PCI device.");
+ return false;
+ }
+
+ strncpy(device_address, "pci/0000", size);
+ if (!append_pci_address(device_address, size, pci)) {
+ error_setg(errp, "Setting device address of a display device: "
+ "Too many PCI devices in the chain.");
+ return false;
+ }
+
+ return true;
+}
