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/*
* Copyright © 2018, 2021 Oracle and/or its affiliates.
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "hw/remote/proxy.h"
#include "hw/pci/pci.h"
#include "qapi/error.h"
#include "io/channel-util.h"
#include "hw/qdev-properties.h"
#include "monitor/monitor.h"
#include "migration/blocker.h"
#include "qemu/sockets.h"
#include "hw/remote/mpqemu-link.h"
#include "qemu/error-report.h"
static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
{
ERRP_GUARD();
PCIProxyDev *dev = PCI_PROXY_DEV(device);
int fd;
if (!dev->fd) {
error_setg(errp, "fd parameter not specified for %s",
DEVICE(device)->id);
return;
}
fd = monitor_fd_param(monitor_cur(), dev->fd, errp);
if (fd == -1) {
error_prepend(errp, "proxy: unable to parse fd %s: ", dev->fd);
return;
}
if (!fd_is_socket(fd)) {
error_setg(errp, "proxy: fd %d is not a socket", fd);
close(fd);
return;
}
dev->ioc = qio_channel_new_fd(fd, errp);
error_setg(&dev->migration_blocker, "%s does not support migration",
TYPE_PCI_PROXY_DEV);
migrate_add_blocker(dev->migration_blocker, errp);
qemu_mutex_init(&dev->io_mutex);
qio_channel_set_blocking(dev->ioc, true, NULL);
}
static void pci_proxy_dev_exit(PCIDevice *pdev)
{
PCIProxyDev *dev = PCI_PROXY_DEV(pdev);
if (dev->ioc) {
qio_channel_close(dev->ioc, NULL);
}
migrate_del_blocker(dev->migration_blocker);
error_free(dev->migration_blocker);
}
static void config_op_send(PCIProxyDev *pdev, uint32_t addr, uint32_t *val,
int len, unsigned int op)
{
MPQemuMsg msg = { 0 };
uint64_t ret = -EINVAL;
Error *local_err = NULL;
msg.cmd = op;
msg.data.pci_conf_data.addr = addr;
msg.data.pci_conf_data.val = (op == MPQEMU_CMD_PCI_CFGWRITE) ? *val : 0;
msg.data.pci_conf_data.len = len;
msg.size = sizeof(PciConfDataMsg);
ret = mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err);
if (local_err) {
error_report_err(local_err);
}
if (ret == UINT64_MAX) {
error_report("Failed to perform PCI config %s operation",
(op == MPQEMU_CMD_PCI_CFGREAD) ? "READ" : "WRITE");
}
if (op == MPQEMU_CMD_PCI_CFGREAD) {
*val = (uint32_t)ret;
}
}
static uint32_t pci_proxy_read_config(PCIDevice *d, uint32_t addr, int len)
{
uint32_t val;
config_op_send(PCI_PROXY_DEV(d), addr, &val, len, MPQEMU_CMD_PCI_CFGREAD);
return val;
}
static void pci_proxy_write_config(PCIDevice *d, uint32_t addr, uint32_t val,
int len)
{
/*
* Some of the functions access the copy of remote device's PCI config
* space which is cached in the proxy device. Therefore, maintain
* it updated.
*/
pci_default_write_config(d, addr, val, len);
config_op_send(PCI_PROXY_DEV(d), addr, &val, len, MPQEMU_CMD_PCI_CFGWRITE);
}
static Property proxy_properties[] = {
DEFINE_PROP_STRING("fd", PCIProxyDev, fd),
DEFINE_PROP_END_OF_LIST(),
};
static void pci_proxy_dev_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->realize = pci_proxy_dev_realize;
k->exit = pci_proxy_dev_exit;
k->config_read = pci_proxy_read_config;
k->config_write = pci_proxy_write_config;
device_class_set_props(dc, proxy_properties);
}
static const TypeInfo pci_proxy_dev_type_info = {
.name = TYPE_PCI_PROXY_DEV,
.parent = TYPE_PCI_DEVICE,
.instance_size = sizeof(PCIProxyDev),
.class_init = pci_proxy_dev_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void pci_proxy_dev_register_types(void)
{
type_register_static(&pci_proxy_dev_type_info);
}
type_init(pci_proxy_dev_register_types)
static void send_bar_access_msg(PCIProxyDev *pdev, MemoryRegion *mr,
bool write, hwaddr addr, uint64_t *val,
unsigned size, bool memory)
{
MPQemuMsg msg = { 0 };
long ret = -EINVAL;
Error *local_err = NULL;
msg.size = sizeof(BarAccessMsg);
msg.data.bar_access.addr = mr->addr + addr;
msg.data.bar_access.size = size;
msg.data.bar_access.memory = memory;
if (write) {
msg.cmd = MPQEMU_CMD_BAR_WRITE;
msg.data.bar_access.val = *val;
} else {
msg.cmd = MPQEMU_CMD_BAR_READ;
}
ret = mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err);
if (local_err) {
error_report_err(local_err);
}
if (!write) {
*val = ret;
}
}
static void proxy_bar_write(void *opaque, hwaddr addr, uint64_t val,
unsigned size)
{
ProxyMemoryRegion *pmr = opaque;
send_bar_access_msg(pmr->dev, &pmr->mr, true, addr, &val, size,
pmr->memory);
}
static uint64_t proxy_bar_read(void *opaque, hwaddr addr, unsigned size)
{
ProxyMemoryRegion *pmr = opaque;
uint64_t val;
send_bar_access_msg(pmr->dev, &pmr->mr, false, addr, &val, size,
pmr->memory);
return val;
}
const MemoryRegionOps proxy_mr_ops = {
.read = proxy_bar_read,
.write = proxy_bar_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 8,
},
};
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