Marc-André Lureau | f6ef71b | 2021-02-15 15:10:36 +0400 | [diff] [blame] | 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 | |
Markus Armbruster | edf5ca5 | 2022-12-22 11:03:28 +0100 | [diff] [blame] | 20 | #include "hw/pci/pci_device.h" |
Marc-André Lureau | f6ef71b | 2021-02-15 15:10:36 +0400 | [diff] [blame] | 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 | { |
Marc-André Lureau | f6ef71b | 2021-02-15 15:10:36 +0400 | [diff] [blame] | 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 | } |