mirror of https://gitee.com/openkylin/qemu.git
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Copyright (C) 2021 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "hw/pci/pci.h"
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#include "hw/pci/pci_bus.h"
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#include "qapi/error.h"
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#include "ui/console.h"
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/*
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* Recursively (in reverse order) appends addresses of PCI devices as it moves
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* up in the PCI hierarchy.
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*
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* @returns true on success, false when the buffer wasn't large enough
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*/
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static bool append_pci_address(char *buf, size_t buf_size, const PCIDevice *pci)
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{
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PCIBus *bus = pci_get_bus(pci);
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/*
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* equivalent to if (!pci_bus_is_root(bus)), but the function is not built
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* with PCI_CONFIG=n, avoid using an #ifdef by checking directly
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*/
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if (bus->parent_dev != NULL) {
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append_pci_address(buf, buf_size, bus->parent_dev);
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}
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size_t len = strlen(buf);
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ssize_t written = snprintf(buf + len, buf_size - len, "/%02x.%x",
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PCI_SLOT(pci->devfn), PCI_FUNC(pci->devfn));
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return written > 0 && written < buf_size - len;
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}
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bool qemu_console_fill_device_address(QemuConsole *con,
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char *device_address,
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size_t size,
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Error **errp)
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{
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ERRP_GUARD();
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DeviceState *dev = DEVICE(object_property_get_link(OBJECT(con),
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"device",
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&error_abort));
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PCIDevice *pci = (PCIDevice *) object_dynamic_cast(OBJECT(dev),
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TYPE_PCI_DEVICE);
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if (pci == NULL) {
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error_setg(errp, "Setting device address of a display device: "
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"Not a PCI device.");
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return false;
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}
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strncpy(device_address, "pci/0000", size);
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if (!append_pci_address(device_address, size, pci)) {
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error_setg(errp, "Setting device address of a display device: "
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"Too many PCI devices in the chain.");
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return false;
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}
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return true;
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}
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