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qemu/hw/usb/core.c
Gerd Hoffmann 5ac2731cf8 usb: improve packet state sanity checks 
Add a new function to check whenever the packet state is as expected,
log more informations in case it isn't.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
2012-03-13 10:15:32 +01:00

689 lines
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/*
* QEMU USB emulation
*
* Copyright (c) 2005 Fabrice Bellard
*
* 2008 Generic packet handler rewrite by Max Krasnyansky
*
* 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-common.h"
#include "hw/usb.h"
#include "iov.h"
#include "trace.h"
void usb_attach(USBPort *port)
{
USBDevice *dev = port->dev;
assert(dev != NULL);
assert(dev->attached);
assert(dev->state == USB_STATE_NOTATTACHED);
port->ops->attach(port);
dev->state = USB_STATE_ATTACHED;
usb_device_handle_attach(dev);
}
void usb_detach(USBPort *port)
{
USBDevice *dev = port->dev;
assert(dev != NULL);
assert(dev->state != USB_STATE_NOTATTACHED);
port->ops->detach(port);
dev->state = USB_STATE_NOTATTACHED;
}
void usb_port_reset(USBPort *port)
{
USBDevice *dev = port->dev;
assert(dev != NULL);
usb_detach(port);
usb_attach(port);
usb_device_reset(dev);
}
void usb_device_reset(USBDevice *dev)
{
if (dev == NULL || !dev->attached) {
return;
}
dev->remote_wakeup = 0;
dev->addr = 0;
dev->state = USB_STATE_DEFAULT;
usb_device_handle_reset(dev);
}
void usb_wakeup(USBEndpoint *ep)
{
USBDevice *dev = ep->dev;
USBBus *bus = usb_bus_from_device(dev);
if (dev->remote_wakeup && dev->port && dev->port->ops->wakeup) {
dev->port->ops->wakeup(dev->port);
}
if (bus->ops->wakeup_endpoint) {
bus->ops->wakeup_endpoint(bus, ep);
}
}
/**********************/
/* generic USB device helpers (you are not forced to use them when
writing your USB device driver, but they help handling the
protocol)
*/
#define SETUP_STATE_IDLE 0
#define SETUP_STATE_SETUP 1
#define SETUP_STATE_DATA 2
#define SETUP_STATE_ACK 3
#define SETUP_STATE_PARAM 4
static int do_token_setup(USBDevice *s, USBPacket *p)
{
int request, value, index;
int ret = 0;
if (p->iov.size != 8) {
return USB_RET_STALL;
}
usb_packet_copy(p, s->setup_buf, p->iov.size);
s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
s->setup_index = 0;
request = (s->setup_buf[0] << 8) | s->setup_buf[1];
value = (s->setup_buf[3] << 8) | s->setup_buf[2];
index = (s->setup_buf[5] << 8) | s->setup_buf[4];
if (s->setup_buf[0] & USB_DIR_IN) {
ret = usb_device_handle_control(s, p, request, value, index,
s->setup_len, s->data_buf);
if (ret == USB_RET_ASYNC) {
s->setup_state = SETUP_STATE_SETUP;
return USB_RET_ASYNC;
}
if (ret < 0)
return ret;
if (ret < s->setup_len)
s->setup_len = ret;
s->setup_state = SETUP_STATE_DATA;
} else {
if (s->setup_len > sizeof(s->data_buf)) {
fprintf(stderr,
"usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
s->setup_len, sizeof(s->data_buf));
return USB_RET_STALL;
}
if (s->setup_len == 0)
s->setup_state = SETUP_STATE_ACK;
else
s->setup_state = SETUP_STATE_DATA;
}
return ret;
}
static int do_token_in(USBDevice *s, USBPacket *p)
{
int request, value, index;
int ret = 0;
assert(p->ep->nr == 0);
request = (s->setup_buf[0] << 8) | s->setup_buf[1];
value = (s->setup_buf[3] << 8) | s->setup_buf[2];
index = (s->setup_buf[5] << 8) | s->setup_buf[4];
switch(s->setup_state) {
case SETUP_STATE_ACK:
if (!(s->setup_buf[0] & USB_DIR_IN)) {
ret = usb_device_handle_control(s, p, request, value, index,
s->setup_len, s->data_buf);
if (ret == USB_RET_ASYNC) {
return USB_RET_ASYNC;
}
s->setup_state = SETUP_STATE_IDLE;
if (ret > 0)
return 0;
return ret;
}
/* return 0 byte */
return 0;
case SETUP_STATE_DATA:
if (s->setup_buf[0] & USB_DIR_IN) {
int len = s->setup_len - s->setup_index;
if (len > p->iov.size) {
len = p->iov.size;
}
usb_packet_copy(p, s->data_buf + s->setup_index, len);
s->setup_index += len;
if (s->setup_index >= s->setup_len)
s->setup_state = SETUP_STATE_ACK;
return len;
}
s->setup_state = SETUP_STATE_IDLE;
return USB_RET_STALL;
default:
return USB_RET_STALL;
}
}
static int do_token_out(USBDevice *s, USBPacket *p)
{
assert(p->ep->nr == 0);
switch(s->setup_state) {
case SETUP_STATE_ACK:
if (s->setup_buf[0] & USB_DIR_IN) {
s->setup_state = SETUP_STATE_IDLE;
/* transfer OK */
} else {
/* ignore additional output */
}
return 0;
case SETUP_STATE_DATA:
if (!(s->setup_buf[0] & USB_DIR_IN)) {
int len = s->setup_len - s->setup_index;
if (len > p->iov.size) {
len = p->iov.size;
}
usb_packet_copy(p, s->data_buf + s->setup_index, len);
s->setup_index += len;
if (s->setup_index >= s->setup_len)
s->setup_state = SETUP_STATE_ACK;
return len;
}
s->setup_state = SETUP_STATE_IDLE;
return USB_RET_STALL;
default:
return USB_RET_STALL;
}
}
static int do_parameter(USBDevice *s, USBPacket *p)
{
int request, value, index;
int i, ret = 0;
for (i = 0; i < 8; i++) {
s->setup_buf[i] = p->parameter >> (i*8);
}
s->setup_state = SETUP_STATE_PARAM;
s->setup_len = (s->setup_buf[7] << 8) | s->setup_buf[6];
s->setup_index = 0;
request = (s->setup_buf[0] << 8) | s->setup_buf[1];
value = (s->setup_buf[3] << 8) | s->setup_buf[2];
index = (s->setup_buf[5] << 8) | s->setup_buf[4];
if (s->setup_len > sizeof(s->data_buf)) {
fprintf(stderr,
"usb_generic_handle_packet: ctrl buffer too small (%d > %zu)\n",
s->setup_len, sizeof(s->data_buf));
return USB_RET_STALL;
}
if (p->pid == USB_TOKEN_OUT) {
usb_packet_copy(p, s->data_buf, s->setup_len);
}
ret = usb_device_handle_control(s, p, request, value, index,
s->setup_len, s->data_buf);
if (ret < 0) {
return ret;
}
if (ret < s->setup_len) {
s->setup_len = ret;
}
if (p->pid == USB_TOKEN_IN) {
usb_packet_copy(p, s->data_buf, s->setup_len);
}
return ret;
}
/* ctrl complete function for devices which use usb_generic_handle_packet and
may return USB_RET_ASYNC from their handle_control callback. Device code
which does this *must* call this function instead of the normal
usb_packet_complete to complete their async control packets. */
void usb_generic_async_ctrl_complete(USBDevice *s, USBPacket *p)
{
if (p->result < 0) {
s->setup_state = SETUP_STATE_IDLE;
}
switch (s->setup_state) {
case SETUP_STATE_SETUP:
if (p->result < s->setup_len) {
s->setup_len = p->result;
}
s->setup_state = SETUP_STATE_DATA;
p->result = 8;
break;
case SETUP_STATE_ACK:
s->setup_state = SETUP_STATE_IDLE;
p->result = 0;
break;
case SETUP_STATE_PARAM:
if (p->result < s->setup_len) {
s->setup_len = p->result;
}
if (p->pid == USB_TOKEN_IN) {
p->result = 0;
usb_packet_copy(p, s->data_buf, s->setup_len);
}
break;
default:
break;
}
usb_packet_complete(s, p);
}
/* XXX: fix overflow */
int set_usb_string(uint8_t *buf, const char *str)
{
int len, i;
uint8_t *q;
q = buf;
len = strlen(str);
*q++ = 2 * len + 2;
*q++ = 3;
for(i = 0; i < len; i++) {
*q++ = str[i];
*q++ = 0;
}
return q - buf;
}
USBDevice *usb_find_device(USBPort *port, uint8_t addr)
{
USBDevice *dev = port->dev;
if (dev == NULL || !dev->attached || dev->state != USB_STATE_DEFAULT) {
return NULL;
}
if (dev->addr == addr) {
return dev;
}
return usb_device_find_device(dev, addr);
}
static int usb_process_one(USBPacket *p)
{
USBDevice *dev = p->ep->dev;
if (p->ep->nr == 0) {
/* control pipe */
if (p->parameter) {
return do_parameter(dev, p);
}
switch (p->pid) {
case USB_TOKEN_SETUP:
return do_token_setup(dev, p);
case USB_TOKEN_IN:
return do_token_in(dev, p);
case USB_TOKEN_OUT:
return do_token_out(dev, p);
default:
return USB_RET_STALL;
}
} else {
/* data pipe */
return usb_device_handle_data(dev, p);
}
}
/* Hand over a packet to a device for processing. Return value
USB_RET_ASYNC indicates the processing isn't finished yet, the
driver will call usb_packet_complete() when done processing it. */
int usb_handle_packet(USBDevice *dev, USBPacket *p)
{
int ret;
if (dev == NULL) {
return USB_RET_NODEV;
}
assert(dev == p->ep->dev);
assert(dev->state == USB_STATE_DEFAULT);
usb_packet_check_state(p, USB_PACKET_SETUP);
assert(p->ep != NULL);
if (QTAILQ_EMPTY(&p->ep->queue) || p->ep->pipeline) {
ret = usb_process_one(p);
if (ret == USB_RET_ASYNC) {
usb_packet_set_state(p, USB_PACKET_ASYNC);
QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
} else {
p->result = ret;
usb_packet_set_state(p, USB_PACKET_COMPLETE);
}
} else {
ret = USB_RET_ASYNC;
usb_packet_set_state(p, USB_PACKET_QUEUED);
QTAILQ_INSERT_TAIL(&p->ep->queue, p, queue);
}
return ret;
}
/* Notify the controller that an async packet is complete. This should only
be called for packets previously deferred by returning USB_RET_ASYNC from
handle_packet. */
void usb_packet_complete(USBDevice *dev, USBPacket *p)
{
USBEndpoint *ep = p->ep;
int ret;
usb_packet_check_state(p, USB_PACKET_ASYNC);
assert(QTAILQ_FIRST(&ep->queue) == p);
usb_packet_set_state(p, USB_PACKET_COMPLETE);
QTAILQ_REMOVE(&ep->queue, p, queue);
dev->port->ops->complete(dev->port, p);
while (!QTAILQ_EMPTY(&ep->queue)) {
p = QTAILQ_FIRST(&ep->queue);
if (p->state == USB_PACKET_ASYNC) {
break;
}
usb_packet_check_state(p, USB_PACKET_QUEUED);
ret = usb_process_one(p);
if (ret == USB_RET_ASYNC) {
usb_packet_set_state(p, USB_PACKET_ASYNC);
break;
}
p->result = ret;
usb_packet_set_state(p, USB_PACKET_COMPLETE);
QTAILQ_REMOVE(&ep->queue, p, queue);
dev->port->ops->complete(dev->port, p);
}
}
/* Cancel an active packet. The packed must have been deferred by
returning USB_RET_ASYNC from handle_packet, and not yet
completed. */
void usb_cancel_packet(USBPacket * p)
{
bool callback = (p->state == USB_PACKET_ASYNC);
assert(usb_packet_is_inflight(p));
usb_packet_set_state(p, USB_PACKET_CANCELED);
QTAILQ_REMOVE(&p->ep->queue, p, queue);
if (callback) {
usb_device_cancel_packet(p->ep->dev, p);
}
}
void usb_packet_init(USBPacket *p)
{
qemu_iovec_init(&p->iov, 1);
}
static const char *usb_packet_state_name(USBPacketState state)
{
static const char *name[] = {
[USB_PACKET_UNDEFINED] = "undef",
[USB_PACKET_SETUP] = "setup",
[USB_PACKET_QUEUED] = "queued",
[USB_PACKET_ASYNC] = "async",
[USB_PACKET_COMPLETE] = "complete",
[USB_PACKET_CANCELED] = "canceled",
};
if (state < ARRAY_SIZE(name)) {
return name[state];
}
return "INVALID";
}
void usb_packet_check_state(USBPacket *p, USBPacketState expected)
{
USBDevice *dev;
USBBus *bus;
if (p->state == expected) {
return;
}
dev = p->ep->dev;
bus = usb_bus_from_device(dev);
trace_usb_packet_state_fault(bus->busnr, dev->port->path, p->ep->nr, p,
usb_packet_state_name(p->state),
usb_packet_state_name(expected));
assert(!"usb packet state check failed");
}
void usb_packet_set_state(USBPacket *p, USBPacketState state)
{
USBDevice *dev = p->ep->dev;
USBBus *bus = usb_bus_from_device(dev);
trace_usb_packet_state_change(bus->busnr, dev->port->path, p->ep->nr, p,
usb_packet_state_name(p->state),
usb_packet_state_name(state));
p->state = state;
}
void usb_packet_setup(USBPacket *p, int pid, USBEndpoint *ep)
{
assert(!usb_packet_is_inflight(p));
p->pid = pid;
p->ep = ep;
p->result = 0;
p->parameter = 0;
qemu_iovec_reset(&p->iov);
usb_packet_set_state(p, USB_PACKET_SETUP);
}
void usb_packet_addbuf(USBPacket *p, void *ptr, size_t len)
{
qemu_iovec_add(&p->iov, ptr, len);
}
void usb_packet_copy(USBPacket *p, void *ptr, size_t bytes)
{
assert(p->result >= 0);
assert(p->result + bytes <= p->iov.size);
switch (p->pid) {
case USB_TOKEN_SETUP:
case USB_TOKEN_OUT:
iov_to_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
break;
case USB_TOKEN_IN:
iov_from_buf(p->iov.iov, p->iov.niov, ptr, p->result, bytes);
break;
default:
fprintf(stderr, "%s: invalid pid: %x\n", __func__, p->pid);
abort();
}
p->result += bytes;
}
void usb_packet_skip(USBPacket *p, size_t bytes)
{
assert(p->result >= 0);
assert(p->result + bytes <= p->iov.size);
if (p->pid == USB_TOKEN_IN) {
iov_clear(p->iov.iov, p->iov.niov, p->result, bytes);
}
p->result += bytes;
}
void usb_packet_cleanup(USBPacket *p)
{
assert(!usb_packet_is_inflight(p));
qemu_iovec_destroy(&p->iov);
}
void usb_ep_init(USBDevice *dev)
{
int ep;
dev->ep_ctl.nr = 0;
dev->ep_ctl.type = USB_ENDPOINT_XFER_CONTROL;
dev->ep_ctl.ifnum = 0;
dev->ep_ctl.dev = dev;
dev->ep_ctl.pipeline = false;
QTAILQ_INIT(&dev->ep_ctl.queue);
for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
dev->ep_in[ep].nr = ep + 1;
dev->ep_out[ep].nr = ep + 1;
dev->ep_in[ep].pid = USB_TOKEN_IN;
dev->ep_out[ep].pid = USB_TOKEN_OUT;
dev->ep_in[ep].type = USB_ENDPOINT_XFER_INVALID;
dev->ep_out[ep].type = USB_ENDPOINT_XFER_INVALID;
dev->ep_in[ep].ifnum = 0;
dev->ep_out[ep].ifnum = 0;
dev->ep_in[ep].dev = dev;
dev->ep_out[ep].dev = dev;
dev->ep_in[ep].pipeline = false;
dev->ep_out[ep].pipeline = false;
QTAILQ_INIT(&dev->ep_in[ep].queue);
QTAILQ_INIT(&dev->ep_out[ep].queue);
}
}
void usb_ep_dump(USBDevice *dev)
{
static const char *tname[] = {
[USB_ENDPOINT_XFER_CONTROL] = "control",
[USB_ENDPOINT_XFER_ISOC] = "isoc",
[USB_ENDPOINT_XFER_BULK] = "bulk",
[USB_ENDPOINT_XFER_INT] = "int",
};
int ifnum, ep, first;
fprintf(stderr, "Device \"%s\", config %d\n",
dev->product_desc, dev->configuration);
for (ifnum = 0; ifnum < 16; ifnum++) {
first = 1;
for (ep = 0; ep < USB_MAX_ENDPOINTS; ep++) {
if (dev->ep_in[ep].type != USB_ENDPOINT_XFER_INVALID &&
dev->ep_in[ep].ifnum == ifnum) {
if (first) {
first = 0;
fprintf(stderr, " Interface %d, alternative %d\n",
ifnum, dev->altsetting[ifnum]);
}
fprintf(stderr, " Endpoint %d, IN, %s, %d max\n", ep,
tname[dev->ep_in[ep].type],
dev->ep_in[ep].max_packet_size);
}
if (dev->ep_out[ep].type != USB_ENDPOINT_XFER_INVALID &&
dev->ep_out[ep].ifnum == ifnum) {
if (first) {
first = 0;
fprintf(stderr, " Interface %d, alternative %d\n",
ifnum, dev->altsetting[ifnum]);
}
fprintf(stderr, " Endpoint %d, OUT, %s, %d max\n", ep,
tname[dev->ep_out[ep].type],
dev->ep_out[ep].max_packet_size);
}
}
}
fprintf(stderr, "--\n");
}
struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep)
{
struct USBEndpoint *eps;
if (dev == NULL) {
return NULL;
}
eps = (pid == USB_TOKEN_IN) ? dev->ep_in : dev->ep_out;
if (ep == 0) {
return &dev->ep_ctl;
}
assert(pid == USB_TOKEN_IN || pid == USB_TOKEN_OUT);
assert(ep > 0 && ep <= USB_MAX_ENDPOINTS);
return eps + ep - 1;
}
uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
return uep->type;
}
void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
uep->type = type;
}
uint8_t usb_ep_get_ifnum(USBDevice *dev, int pid, int ep)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
return uep->ifnum;
}
void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
uep->ifnum = ifnum;
}
void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep,
uint16_t raw)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
int size, microframes;
size = raw & 0x7ff;
switch ((raw >> 11) & 3) {
case 1:
microframes = 2;
break;
case 2:
microframes = 3;
break;
default:
microframes = 1;
break;
}
uep->max_packet_size = size * microframes;
}
int usb_ep_get_max_packet_size(USBDevice *dev, int pid, int ep)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
return uep->max_packet_size;
}
void usb_ep_set_pipeline(USBDevice *dev, int pid, int ep, bool enabled)
{
struct USBEndpoint *uep = usb_ep_get(dev, pid, ep);
uep->pipeline = enabled;
}
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