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qemu-patch-raspberry4/hw/remote/proxy.c
Elena Ufimtseva b6cc02d98f multi-process: perform device reset in the remote process 
Perform device reset in the remote process when QEMU performs
device reset. This is required to reset the internal state
(like registers, etc...) of emulated devices

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 7cb220a51f565dc0817bd76e2f540e89c2d2b850.1611938319.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-02-10 09:23:28 +00:00

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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"
#include "hw/remote/proxy-memory-listener.h"
#include "qom/object.h"
#include "qemu/event_notifier.h"
#include "sysemu/kvm.h"
#include "util/event_notifier-posix.c"
static void probe_pci_info(PCIDevice *dev, Error **errp);
static void proxy_device_reset(DeviceState *dev);
static void proxy_intx_update(PCIDevice *pci_dev)
{
PCIProxyDev *dev = PCI_PROXY_DEV(pci_dev);
PCIINTxRoute route;
int pin = pci_get_byte(pci_dev->config + PCI_INTERRUPT_PIN) - 1;
if (dev->virq != -1) {
kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, &dev->intr, dev->virq);
dev->virq = -1;
}
route = pci_device_route_intx_to_irq(pci_dev, pin);
dev->virq = route.irq;
if (dev->virq != -1) {
kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, &dev->intr,
&dev->resample, dev->virq);
}
}
static void setup_irqfd(PCIProxyDev *dev)
{
PCIDevice *pci_dev = PCI_DEVICE(dev);
MPQemuMsg msg;
Error *local_err = NULL;
event_notifier_init(&dev->intr, 0);
event_notifier_init(&dev->resample, 0);
memset(&msg, 0, sizeof(MPQemuMsg));
msg.cmd = MPQEMU_CMD_SET_IRQFD;
msg.num_fds = 2;
msg.fds[0] = event_notifier_get_fd(&dev->intr);
msg.fds[1] = event_notifier_get_fd(&dev->resample);
msg.size = 0;
if (!mpqemu_msg_send(&msg, dev->ioc, &local_err)) {
error_report_err(local_err);
}
dev->virq = -1;
proxy_intx_update(pci_dev);
pci_device_set_intx_routing_notifier(pci_dev, proxy_intx_update);
}
static void pci_proxy_dev_realize(PCIDevice *device, Error **errp)
{
ERRP_GUARD();
PCIProxyDev *dev = PCI_PROXY_DEV(device);
uint8_t *pci_conf = device->config;
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);
pci_conf[PCI_LATENCY_TIMER] = 0xff;
pci_conf[PCI_INTERRUPT_PIN] = 0x01;
proxy_memory_listener_configure(&dev->proxy_listener, dev->ioc);
setup_irqfd(dev);
probe_pci_info(PCI_DEVICE(dev), errp);
}
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);
proxy_memory_listener_deconfigure(&dev->proxy_listener);
event_notifier_cleanup(&dev->intr);
event_notifier_cleanup(&dev->resample);
}
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;
dc->reset = proxy_device_reset;
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,
},
};
static void probe_pci_info(PCIDevice *dev, Error **errp)
{
PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
uint32_t orig_val, new_val, base_class, val;
PCIProxyDev *pdev = PCI_PROXY_DEV(dev);
DeviceClass *dc = DEVICE_CLASS(pc);
uint8_t type;
int i, size;
config_op_send(pdev, PCI_VENDOR_ID, &val, 2, MPQEMU_CMD_PCI_CFGREAD);
pc->vendor_id = (uint16_t)val;
config_op_send(pdev, PCI_DEVICE_ID, &val, 2, MPQEMU_CMD_PCI_CFGREAD);
pc->device_id = (uint16_t)val;
config_op_send(pdev, PCI_CLASS_DEVICE, &val, 2, MPQEMU_CMD_PCI_CFGREAD);
pc->class_id = (uint16_t)val;
config_op_send(pdev, PCI_SUBSYSTEM_ID, &val, 2, MPQEMU_CMD_PCI_CFGREAD);
pc->subsystem_id = (uint16_t)val;
base_class = pc->class_id >> 4;
switch (base_class) {
case PCI_BASE_CLASS_BRIDGE:
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
break;
case PCI_BASE_CLASS_STORAGE:
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
break;
case PCI_BASE_CLASS_NETWORK:
set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
break;
case PCI_BASE_CLASS_INPUT:
set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
break;
case PCI_BASE_CLASS_DISPLAY:
set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
break;
case PCI_BASE_CLASS_PROCESSOR:
set_bit(DEVICE_CATEGORY_CPU, dc->categories);
break;
default:
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
break;
}
for (i = 0; i < PCI_NUM_REGIONS; i++) {
config_op_send(pdev, PCI_BASE_ADDRESS_0 + (4 * i), &orig_val, 4,
MPQEMU_CMD_PCI_CFGREAD);
new_val = 0xffffffff;
config_op_send(pdev, PCI_BASE_ADDRESS_0 + (4 * i), &new_val, 4,
MPQEMU_CMD_PCI_CFGWRITE);
config_op_send(pdev, PCI_BASE_ADDRESS_0 + (4 * i), &new_val, 4,
MPQEMU_CMD_PCI_CFGREAD);
size = (~(new_val & 0xFFFFFFF0)) + 1;
config_op_send(pdev, PCI_BASE_ADDRESS_0 + (4 * i), &orig_val, 4,
MPQEMU_CMD_PCI_CFGWRITE);
type = (new_val & 0x1) ?
PCI_BASE_ADDRESS_SPACE_IO : PCI_BASE_ADDRESS_SPACE_MEMORY;
if (size) {
g_autofree char *name;
pdev->region[i].dev = pdev;
pdev->region[i].present = true;
if (type == PCI_BASE_ADDRESS_SPACE_MEMORY) {
pdev->region[i].memory = true;
}
name = g_strdup_printf("bar-region-%d", i);
memory_region_init_io(&pdev->region[i].mr, OBJECT(pdev),
&proxy_mr_ops, &pdev->region[i],
name, size);
pci_register_bar(dev, i, type, &pdev->region[i].mr);
}
}
}
static void proxy_device_reset(DeviceState *dev)
{
PCIProxyDev *pdev = PCI_PROXY_DEV(dev);
MPQemuMsg msg = { 0 };
Error *local_err = NULL;
msg.cmd = MPQEMU_CMD_DEVICE_RESET;
msg.size = 0;
mpqemu_msg_send_and_await_reply(&msg, pdev, &local_err);
if (local_err) {
error_report_err(local_err);
}
}
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