1 /* 2 * Copyright (C) 2021 Red Hat, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License as 6 * published by the Free Software Foundation; either version 2 or 7 * (at your option) version 3 of the License. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "qemu/osdep.h" 19 20 #include "hw/pci/pci_device.h" 21 #include "hw/pci/pci_bus.h" 22 #include "qapi/error.h" 23 #include "ui/console.h" 24 25 /* 26 * Recursively (in reverse order) appends addresses of PCI devices as it moves 27 * up in the PCI hierarchy. 28 * 29 * @returns true on success, false when the buffer wasn't large enough 30 */ 31 static bool append_pci_address(char *buf, size_t buf_size, const PCIDevice *pci) 32 { 33 PCIBus *bus = pci_get_bus(pci); 34 /* 35 * equivalent to if (!pci_bus_is_root(bus)), but the function is not built 36 * with PCI_CONFIG=n, avoid using an #ifdef by checking directly 37 */ 38 if (bus->parent_dev != NULL) { 39 append_pci_address(buf, buf_size, bus->parent_dev); 40 } 41 42 size_t len = strlen(buf); 43 ssize_t written = snprintf(buf + len, buf_size - len, "/%02x.%x", 44 PCI_SLOT(pci->devfn), PCI_FUNC(pci->devfn)); 45 46 return written > 0 && written < buf_size - len; 47 } 48 49 bool qemu_console_fill_device_address(QemuConsole *con, 50 char *device_address, 51 size_t size, 52 Error **errp) 53 { 54 DeviceState *dev = DEVICE(object_property_get_link(OBJECT(con), 55 "device", 56 &error_abort)); 57 PCIDevice *pci = (PCIDevice *) object_dynamic_cast(OBJECT(dev), 58 TYPE_PCI_DEVICE); 59 60 if (pci == NULL) { 61 error_setg(errp, "Setting device address of a display device: " 62 "Not a PCI device."); 63 return false; 64 } 65 66 strncpy(device_address, "pci/0000", size); 67 if (!append_pci_address(device_address, size, pci)) { 68 error_setg(errp, "Setting device address of a display device: " 69 "Too many PCI devices in the chain."); 70 return false; 71 } 72 73 return true; 74 } 75