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qemu/hw/usb/dev-hub.c
Richard Henderson 3abedf29b4 hw/usb: Constify VMState 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231221031652.119827-59-richard.henderson@linaro.org>
2023-12-30 07:38:06 +11:00

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/*
* QEMU USB HUB emulation
*
* Copyright (c) 2005 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu/timer.h"
#include "trace.h"
#include "hw/qdev-properties.h"
#include "hw/usb.h"
#include "migration/vmstate.h"
#include "desc.h"
#include "qemu/error-report.h"
#include "qemu/module.h"
#include "qom/object.h"
#define MAX_PORTS 8
typedef struct USBHubPort {
USBPort port;
uint16_t wPortStatus;
uint16_t wPortChange;
} USBHubPort;
struct USBHubState {
USBDevice dev;
USBEndpoint *intr;
uint32_t num_ports;
bool port_power;
QEMUTimer *port_timer;
USBHubPort ports[MAX_PORTS];
};
#define TYPE_USB_HUB "usb-hub"
OBJECT_DECLARE_SIMPLE_TYPE(USBHubState, USB_HUB)
#define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
#define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
#define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
#define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
#define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
#define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
#define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
#define PORT_STAT_CONNECTION 0x0001
#define PORT_STAT_ENABLE 0x0002
#define PORT_STAT_SUSPEND 0x0004
#define PORT_STAT_OVERCURRENT 0x0008
#define PORT_STAT_RESET 0x0010
#define PORT_STAT_POWER 0x0100
#define PORT_STAT_LOW_SPEED 0x0200
#define PORT_STAT_HIGH_SPEED 0x0400
#define PORT_STAT_TEST 0x0800
#define PORT_STAT_INDICATOR 0x1000
#define PORT_STAT_C_CONNECTION 0x0001
#define PORT_STAT_C_ENABLE 0x0002
#define PORT_STAT_C_SUSPEND 0x0004
#define PORT_STAT_C_OVERCURRENT 0x0008
#define PORT_STAT_C_RESET 0x0010
#define PORT_CONNECTION 0
#define PORT_ENABLE 1
#define PORT_SUSPEND 2
#define PORT_OVERCURRENT 3
#define PORT_RESET 4
#define PORT_POWER 8
#define PORT_LOWSPEED 9
#define PORT_HIGHSPEED 10
#define PORT_C_CONNECTION 16
#define PORT_C_ENABLE 17
#define PORT_C_SUSPEND 18
#define PORT_C_OVERCURRENT 19
#define PORT_C_RESET 20
#define PORT_TEST 21
#define PORT_INDICATOR 22
/* same as Linux kernel root hubs */
enum {
STR_MANUFACTURER = 1,
STR_PRODUCT,
STR_SERIALNUMBER,
};
static const USBDescStrings desc_strings = {
[STR_MANUFACTURER] = "QEMU",
[STR_PRODUCT] = "QEMU USB Hub",
[STR_SERIALNUMBER] = "314159",
};
static const USBDescIface desc_iface_hub = {
.bInterfaceNumber = 0,
.bNumEndpoints = 1,
.bInterfaceClass = USB_CLASS_HUB,
.eps = (USBDescEndpoint[]) {
{
.bEndpointAddress = USB_DIR_IN | 0x01,
.bmAttributes = USB_ENDPOINT_XFER_INT,
.wMaxPacketSize = 1 + DIV_ROUND_UP(MAX_PORTS, 8),
.bInterval = 0xff,
},
}
};
static const USBDescDevice desc_device_hub = {
.bcdUSB = 0x0110,
.bDeviceClass = USB_CLASS_HUB,
.bMaxPacketSize0 = 8,
.bNumConfigurations = 1,
.confs = (USBDescConfig[]) {
{
.bNumInterfaces = 1,
.bConfigurationValue = 1,
.bmAttributes = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER |
USB_CFG_ATT_WAKEUP,
.nif = 1,
.ifs = &desc_iface_hub,
},
},
};
static const USBDesc desc_hub = {
.id = {
.idVendor = 0x0409,
.idProduct = 0x55aa,
.bcdDevice = 0x0101,
.iManufacturer = STR_MANUFACTURER,
.iProduct = STR_PRODUCT,
.iSerialNumber = STR_SERIALNUMBER,
},
.full = &desc_device_hub,
.str = desc_strings,
};
static const uint8_t qemu_hub_hub_descriptor[] =
{
0x00, /* u8 bLength; patched in later */
0x29, /* u8 bDescriptorType; Hub-descriptor */
0x00, /* u8 bNbrPorts; (patched later) */
0x0a, /* u16 wHubCharacteristics; */
0x00, /* (per-port OC, no power switching) */
0x01, /* u8 bPwrOn2pwrGood; 2ms */
0x00 /* u8 bHubContrCurrent; 0 mA */
/* DeviceRemovable and PortPwrCtrlMask patched in later */
};
static bool usb_hub_port_change(USBHubPort *port, uint16_t status)
{
bool notify = false;
if (status & 0x1f) {
port->wPortChange |= status;
notify = true;
}
return notify;
}
static bool usb_hub_port_set(USBHubPort *port, uint16_t status)
{
if (port->wPortStatus & status) {
return false;
}
port->wPortStatus |= status;
return usb_hub_port_change(port, status);
}
static bool usb_hub_port_clear(USBHubPort *port, uint16_t status)
{
if (!(port->wPortStatus & status)) {
return false;
}
port->wPortStatus &= ~status;
return usb_hub_port_change(port, status);
}
static bool usb_hub_port_update(USBHubPort *port)
{
bool notify = false;
if (port->port.dev && port->port.dev->attached) {
notify = usb_hub_port_set(port, PORT_STAT_CONNECTION);
if (port->port.dev->speed == USB_SPEED_LOW) {
usb_hub_port_set(port, PORT_STAT_LOW_SPEED);
} else {
usb_hub_port_clear(port, PORT_STAT_LOW_SPEED);
}
}
return notify;
}
static void usb_hub_port_update_timer(void *opaque)
{
USBHubState *s = opaque;
bool notify = false;
int i;
for (i = 0; i < s->num_ports; i++) {
notify |= usb_hub_port_update(&s->ports[i]);
}
if (notify) {
usb_wakeup(s->intr, 0);
}
}
static void usb_hub_attach(USBPort *port1)
{
USBHubState *s = port1->opaque;
USBHubPort *port = &s->ports[port1->index];
trace_usb_hub_attach(s->dev.addr, port1->index + 1);
usb_hub_port_update(port);
usb_wakeup(s->intr, 0);
}
static void usb_hub_detach(USBPort *port1)
{
USBHubState *s = port1->opaque;
USBHubPort *port = &s->ports[port1->index];
trace_usb_hub_detach(s->dev.addr, port1->index + 1);
usb_wakeup(s->intr, 0);
/* Let upstream know the device on this port is gone */
s->dev.port->ops->child_detach(s->dev.port, port1->dev);
usb_hub_port_clear(port, PORT_STAT_CONNECTION);
usb_hub_port_clear(port, PORT_STAT_ENABLE);
usb_hub_port_clear(port, PORT_STAT_SUSPEND);
usb_wakeup(s->intr, 0);
}
static void usb_hub_child_detach(USBPort *port1, USBDevice *child)
{
USBHubState *s = port1->opaque;
/* Pass along upstream */
s->dev.port->ops->child_detach(s->dev.port, child);
}
static void usb_hub_wakeup(USBPort *port1)
{
USBHubState *s = port1->opaque;
USBHubPort *port = &s->ports[port1->index];
if (usb_hub_port_clear(port, PORT_STAT_SUSPEND)) {
usb_wakeup(s->intr, 0);
}
}
static void usb_hub_complete(USBPort *port, USBPacket *packet)
{
USBHubState *s = port->opaque;
/*
* Just pass it along upstream for now.
*
* If we ever implement usb 2.0 split transactions this will
* become a little more complicated ...
*
* Can't use usb_packet_complete() here because packet->owner is
* cleared already, go call the ->complete() callback directly
* instead.
*/
s->dev.port->ops->complete(s->dev.port, packet);
}
static USBDevice *usb_hub_find_device(USBDevice *dev, uint8_t addr)
{
USBHubState *s = USB_HUB(dev);
USBHubPort *port;
USBDevice *downstream;
int i;
for (i = 0; i < s->num_ports; i++) {
port = &s->ports[i];
if (!(port->wPortStatus & PORT_STAT_ENABLE)) {
continue;
}
downstream = usb_find_device(&port->port, addr);
if (downstream != NULL) {
return downstream;
}
}
return NULL;
}
static void usb_hub_handle_reset(USBDevice *dev)
{
USBHubState *s = USB_HUB(dev);
USBHubPort *port;
int i;
trace_usb_hub_reset(s->dev.addr);
for (i = 0; i < s->num_ports; i++) {
port = s->ports + i;
port->wPortStatus = 0;
port->wPortChange = 0;
usb_hub_port_set(port, PORT_STAT_POWER);
usb_hub_port_update(port);
}
}
static const char *feature_name(int feature)
{
static const char *name[] = {
[PORT_CONNECTION] = "connection",
[PORT_ENABLE] = "enable",
[PORT_SUSPEND] = "suspend",
[PORT_OVERCURRENT] = "overcurrent",
[PORT_RESET] = "reset",
[PORT_POWER] = "power",
[PORT_LOWSPEED] = "lowspeed",
[PORT_HIGHSPEED] = "highspeed",
[PORT_C_CONNECTION] = "change-connection",
[PORT_C_ENABLE] = "change-enable",
[PORT_C_SUSPEND] = "change-suspend",
[PORT_C_OVERCURRENT] = "change-overcurrent",
[PORT_C_RESET] = "change-reset",
[PORT_TEST] = "test",
[PORT_INDICATOR] = "indicator",
};
if (feature < 0 || feature >= ARRAY_SIZE(name)) {
return "?";
}
return name[feature] ?: "?";
}
static void usb_hub_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
USBHubState *s = (USBHubState *)dev;
int ret;
trace_usb_hub_control(s->dev.addr, request, value, index, length);
ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
if (ret >= 0) {
return;
}
switch(request) {
case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
if (value == 0 && index != 0x81) { /* clear ep halt */
goto fail;
}
break;
/* usb specific requests */
case GetHubStatus:
data[0] = 0;
data[1] = 0;
data[2] = 0;
data[3] = 0;
p->actual_length = 4;
break;
case GetPortStatus:
{
unsigned int n = index - 1;
USBHubPort *port;
if (n >= s->num_ports) {
goto fail;
}
port = &s->ports[n];
trace_usb_hub_get_port_status(s->dev.addr, index,
port->wPortStatus,
port->wPortChange);
data[0] = port->wPortStatus;
data[1] = port->wPortStatus >> 8;
data[2] = port->wPortChange;
data[3] = port->wPortChange >> 8;
p->actual_length = 4;
}
break;
case SetHubFeature:
case ClearHubFeature:
if (value != 0 && value != 1) {
goto fail;
}
break;
case SetPortFeature:
{
unsigned int n = index - 1;
USBHubPort *port;
USBDevice *pdev;
trace_usb_hub_set_port_feature(s->dev.addr, index,
feature_name(value));
if (n >= s->num_ports) {
goto fail;
}
port = &s->ports[n];
pdev = port->port.dev;
switch(value) {
case PORT_SUSPEND:
port->wPortStatus |= PORT_STAT_SUSPEND;
break;
case PORT_RESET:
usb_hub_port_set(port, PORT_STAT_RESET);
usb_hub_port_clear(port, PORT_STAT_RESET);
if (pdev && pdev->attached) {
usb_device_reset(pdev);
usb_hub_port_set(port, PORT_STAT_ENABLE);
}
usb_wakeup(s->intr, 0);
break;
case PORT_POWER:
if (s->port_power) {
int64_t now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
usb_hub_port_set(port, PORT_STAT_POWER);
timer_mod(s->port_timer, now + 5000000); /* 5 ms */
}
break;
default:
goto fail;
}
}
break;
case ClearPortFeature:
{
unsigned int n = index - 1;
USBHubPort *port;
trace_usb_hub_clear_port_feature(s->dev.addr, index,
feature_name(value));
if (n >= s->num_ports) {
goto fail;
}
port = &s->ports[n];
switch(value) {
case PORT_ENABLE:
port->wPortStatus &= ~PORT_STAT_ENABLE;
break;
case PORT_C_ENABLE:
port->wPortChange &= ~PORT_STAT_C_ENABLE;
break;
case PORT_SUSPEND:
usb_hub_port_clear(port, PORT_STAT_SUSPEND);
break;
case PORT_C_SUSPEND:
port->wPortChange &= ~PORT_STAT_C_SUSPEND;
break;
case PORT_C_CONNECTION:
port->wPortChange &= ~PORT_STAT_C_CONNECTION;
break;
case PORT_C_OVERCURRENT:
port->wPortChange &= ~PORT_STAT_C_OVERCURRENT;
break;
case PORT_C_RESET:
port->wPortChange &= ~PORT_STAT_C_RESET;
break;
case PORT_POWER:
if (s->port_power) {
usb_hub_port_clear(port, PORT_STAT_POWER);
usb_hub_port_clear(port, PORT_STAT_CONNECTION);
usb_hub_port_clear(port, PORT_STAT_ENABLE);
usb_hub_port_clear(port, PORT_STAT_SUSPEND);
port->wPortChange = 0;
}
default:
goto fail;
}
}
break;
case GetHubDescriptor:
{
unsigned int n, limit, var_hub_size = 0;
memcpy(data, qemu_hub_hub_descriptor,
sizeof(qemu_hub_hub_descriptor));
data[2] = s->num_ports;
if (s->port_power) {
data[3] &= ~0x03;
data[3] |= 0x01;
}
/* fill DeviceRemovable bits */
limit = DIV_ROUND_UP(s->num_ports + 1, 8) + 7;
for (n = 7; n < limit; n++) {
data[n] = 0x00;
var_hub_size++;
}
/* fill PortPwrCtrlMask bits */
limit = limit + DIV_ROUND_UP(s->num_ports, 8);
for (;n < limit; n++) {
data[n] = 0xff;
var_hub_size++;
}
p->actual_length = sizeof(qemu_hub_hub_descriptor) + var_hub_size;
data[0] = p->actual_length;
break;
}
default:
fail:
p->status = USB_RET_STALL;
break;
}
}
static void usb_hub_handle_data(USBDevice *dev, USBPacket *p)
{
USBHubState *s = (USBHubState *)dev;
switch(p->pid) {
case USB_TOKEN_IN:
if (p->ep->nr == 1) {
USBHubPort *port;
unsigned int status;
uint8_t buf[4];
int i, n;
n = DIV_ROUND_UP(s->num_ports + 1, 8);
if (p->iov.size == 1) { /* FreeBSD workaround */
n = 1;
} else if (n > p->iov.size) {
p->status = USB_RET_BABBLE;
return;
}
status = 0;
for (i = 0; i < s->num_ports; i++) {
port = &s->ports[i];
if (port->wPortChange)
status |= (1 << (i + 1));
}
if (status != 0) {
trace_usb_hub_status_report(s->dev.addr, status);
for(i = 0; i < n; i++) {
buf[i] = status >> (8 * i);
}
usb_packet_copy(p, buf, n);
} else {
p->status = USB_RET_NAK; /* usb11 11.13.1 */
}
} else {
goto fail;
}
break;
case USB_TOKEN_OUT:
default:
fail:
p->status = USB_RET_STALL;
break;
}
}
static void usb_hub_unrealize(USBDevice *dev)
{
USBHubState *s = (USBHubState *)dev;
int i;
for (i = 0; i < s->num_ports; i++) {
usb_unregister_port(usb_bus_from_device(dev),
&s->ports[i].port);
}
timer_free(s->port_timer);
}
static USBPortOps usb_hub_port_ops = {
.attach = usb_hub_attach,
.detach = usb_hub_detach,
.child_detach = usb_hub_child_detach,
.wakeup = usb_hub_wakeup,
.complete = usb_hub_complete,
};
static void usb_hub_realize(USBDevice *dev, Error **errp)
{
USBHubState *s = USB_HUB(dev);
USBHubPort *port;
int i;
if (s->num_ports < 1 || s->num_ports > MAX_PORTS) {
error_setg(errp, "num_ports (%d) out of range (1..%d)",
s->num_ports, MAX_PORTS);
return;
}
if (dev->port->hubcount == 5) {
error_setg(errp, "usb hub chain too deep");
return;
}
usb_desc_create_serial(dev);
usb_desc_init(dev);
s->port_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
usb_hub_port_update_timer, s);
s->intr = usb_ep_get(dev, USB_TOKEN_IN, 1);
for (i = 0; i < s->num_ports; i++) {
port = &s->ports[i];
usb_register_port(usb_bus_from_device(dev),
&port->port, s, i, &usb_hub_port_ops,
USB_SPEED_MASK_LOW | USB_SPEED_MASK_FULL);
usb_port_location(&port->port, dev->port, i+1);
}
usb_hub_handle_reset(dev);
}
static const VMStateDescription vmstate_usb_hub_port = {
.name = "usb-hub-port",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT16(wPortStatus, USBHubPort),
VMSTATE_UINT16(wPortChange, USBHubPort),
VMSTATE_END_OF_LIST()
}
};
static bool usb_hub_port_timer_needed(void *opaque)
{
USBHubState *s = opaque;
return s->port_power;
}
static const VMStateDescription vmstate_usb_hub_port_timer = {
.name = "usb-hub/port-timer",
.version_id = 1,
.minimum_version_id = 1,
.needed = usb_hub_port_timer_needed,
.fields = (const VMStateField[]) {
VMSTATE_TIMER_PTR(port_timer, USBHubState),
VMSTATE_END_OF_LIST()
},
};
static const VMStateDescription vmstate_usb_hub = {
.name = "usb-hub",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_USB_DEVICE(dev, USBHubState),
VMSTATE_STRUCT_ARRAY(ports, USBHubState, MAX_PORTS, 0,
vmstate_usb_hub_port, USBHubPort),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * const []) {
&vmstate_usb_hub_port_timer,
NULL
}
};
static Property usb_hub_properties[] = {
DEFINE_PROP_UINT32("ports", USBHubState, num_ports, 8),
DEFINE_PROP_BOOL("port-power", USBHubState, port_power, false),
DEFINE_PROP_END_OF_LIST(),
};
static void usb_hub_class_initfn(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
uc->realize = usb_hub_realize;
uc->product_desc = "QEMU USB Hub";
uc->usb_desc = &desc_hub;
uc->find_device = usb_hub_find_device;
uc->handle_reset = usb_hub_handle_reset;
uc->handle_control = usb_hub_handle_control;
uc->handle_data = usb_hub_handle_data;
uc->unrealize = usb_hub_unrealize;
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->fw_name = "hub";
dc->vmsd = &vmstate_usb_hub;
device_class_set_props(dc, usb_hub_properties);
}
static const TypeInfo hub_info = {
.name = TYPE_USB_HUB,
.parent = TYPE_USB_DEVICE,
.instance_size = sizeof(USBHubState),
.class_init = usb_hub_class_initfn,
};
static void usb_hub_register_types(void)
{
type_register_static(&hub_info);
}
type_init(usb_hub_register_types)
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