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freebsd/lib/libusb/libusb10_io.c
Hans Petter Selasky 2682992483 When multiple threads are involved receiving completion events in LibUSB 
make sure there is always a master polling thread, by setting the "ctx_handler"
field in the context. Else the reception of completion events can stop.
This happens if event threads are created and destroyed during runtime.

Found by:		Ludovic Rousseau <ludovic.rousseau+freebsd@gmail.com>
PR:			231742
MFC after:		1 week
Approved by:		re (kib)
Sponsored by:		Mellanox Technologies
2018-09-28 10:28:22 +00:00

838 lines
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/* $FreeBSD$ */
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009 Sylvestre Gallon. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef LIBUSB_GLOBAL_INCLUDE_FILE
#include LIBUSB_GLOBAL_INCLUDE_FILE
#else
#include <errno.h>
#include <poll.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/queue.h>
#include <sys/endian.h>
#endif
#define libusb_device_handle libusb20_device
#include "libusb20.h"
#include "libusb20_desc.h"
#include "libusb20_int.h"
#include "libusb.h"
#include "libusb10.h"
UNEXPORTED void
libusb10_add_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd,
struct libusb20_device *pdev, int fd, short events)
{
if (ctx == NULL)
return; /* invalid */
if (pollfd->entry.tqe_prev != NULL)
return; /* already queued */
if (fd < 0)
return; /* invalid */
pollfd->pdev = pdev;
pollfd->pollfd.fd = fd;
pollfd->pollfd.events = events;
CTX_LOCK(ctx);
TAILQ_INSERT_TAIL(&ctx->pollfds, pollfd, entry);
CTX_UNLOCK(ctx);
if (ctx->fd_added_cb)
ctx->fd_added_cb(fd, events, ctx->fd_cb_user_data);
}
UNEXPORTED void
libusb10_remove_pollfd(libusb_context *ctx, struct libusb_super_pollfd *pollfd)
{
if (ctx == NULL)
return; /* invalid */
if (pollfd->entry.tqe_prev == NULL)
return; /* already dequeued */
CTX_LOCK(ctx);
TAILQ_REMOVE(&ctx->pollfds, pollfd, entry);
pollfd->entry.tqe_prev = NULL;
CTX_UNLOCK(ctx);
if (ctx->fd_removed_cb)
ctx->fd_removed_cb(pollfd->pollfd.fd, ctx->fd_cb_user_data);
}
/* This function must be called locked */
static int
libusb10_handle_events_sub(struct libusb_context *ctx, struct timeval *tv)
{
struct libusb_device *dev;
struct libusb20_device **ppdev;
struct libusb_super_pollfd *pfd;
struct pollfd *fds;
struct libusb_super_transfer *sxfer;
struct libusb_transfer *uxfer;
nfds_t nfds;
int timeout;
int i;
int err;
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb10_handle_events_sub enter");
nfds = 0;
i = 0;
TAILQ_FOREACH(pfd, &ctx->pollfds, entry)
nfds++;
fds = alloca(sizeof(*fds) * nfds);
if (fds == NULL)
return (LIBUSB_ERROR_NO_MEM);
ppdev = alloca(sizeof(*ppdev) * nfds);
if (ppdev == NULL)
return (LIBUSB_ERROR_NO_MEM);
TAILQ_FOREACH(pfd, &ctx->pollfds, entry) {
fds[i].fd = pfd->pollfd.fd;
fds[i].events = pfd->pollfd.events;
fds[i].revents = 0;
ppdev[i] = pfd->pdev;
if (pfd->pdev != NULL)
libusb_get_device(pfd->pdev)->refcnt++;
i++;
}
if (tv == NULL)
timeout = -1;
else
timeout = (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
CTX_UNLOCK(ctx);
err = poll(fds, nfds, timeout);
CTX_LOCK(ctx);
if ((err == -1) && (errno == EINTR))
err = LIBUSB_ERROR_INTERRUPTED;
else if (err < 0)
err = LIBUSB_ERROR_IO;
if (err < 1) {
for (i = 0; i != (int)nfds; i++) {
if (ppdev[i] != NULL) {
CTX_UNLOCK(ctx);
libusb_unref_device(libusb_get_device(ppdev[i]));
CTX_LOCK(ctx);
}
}
goto do_done;
}
for (i = 0; i != (int)nfds; i++) {
if (ppdev[i] != NULL) {
dev = libusb_get_device(ppdev[i]);
if (fds[i].revents != 0) {
err = libusb20_dev_process(ppdev[i]);
if (err) {
/* set device is gone */
dev->device_is_gone = 1;
/* remove USB device from polling loop */
libusb10_remove_pollfd(dev->ctx, &dev->dev_poll);
/* cancel all pending transfers */
libusb10_cancel_all_transfer_locked(ppdev[i], dev);
}
}
CTX_UNLOCK(ctx);
libusb_unref_device(dev);
CTX_LOCK(ctx);
} else {
uint8_t dummy;
while (read(fds[i].fd, &dummy, 1) == 1)
;
}
}
err = 0;
do_done:
/* Do all done callbacks */
while ((sxfer = TAILQ_FIRST(&ctx->tr_done))) {
uint8_t flags;
TAILQ_REMOVE(&ctx->tr_done, sxfer, entry);
sxfer->entry.tqe_prev = NULL;
ctx->tr_done_ref++;
CTX_UNLOCK(ctx);
uxfer = (struct libusb_transfer *)(
((uint8_t *)sxfer) + sizeof(*sxfer));
/* Allow the callback to free the transfer itself. */
flags = uxfer->flags;
if (uxfer->callback != NULL)
(uxfer->callback) (uxfer);
/* Check if the USB transfer should be automatically freed. */
if (flags & LIBUSB_TRANSFER_FREE_TRANSFER)
libusb_free_transfer(uxfer);
CTX_LOCK(ctx);
ctx->tr_done_ref--;
ctx->tr_done_gen++;
}
/* Wakeup other waiters */
pthread_cond_broadcast(&ctx->ctx_cond);
return (err);
}
/* Polling and timing */
int
libusb_try_lock_events(libusb_context *ctx)
{
int err;
ctx = GET_CONTEXT(ctx);
if (ctx == NULL)
return (1);
err = CTX_TRYLOCK(ctx);
if (err)
return (1);
err = (ctx->ctx_handler != NO_THREAD);
if (err)
CTX_UNLOCK(ctx);
else
ctx->ctx_handler = pthread_self();
return (err);
}
void
libusb_lock_events(libusb_context *ctx)
{
ctx = GET_CONTEXT(ctx);
CTX_LOCK(ctx);
if (ctx->ctx_handler == NO_THREAD)
ctx->ctx_handler = pthread_self();
}
void
libusb_unlock_events(libusb_context *ctx)
{
ctx = GET_CONTEXT(ctx);
if (ctx->ctx_handler == pthread_self()) {
ctx->ctx_handler = NO_THREAD;
pthread_cond_broadcast(&ctx->ctx_cond);
}
CTX_UNLOCK(ctx);
}
int
libusb_event_handling_ok(libusb_context *ctx)
{
ctx = GET_CONTEXT(ctx);
return (ctx->ctx_handler == pthread_self());
}
int
libusb_event_handler_active(libusb_context *ctx)
{
ctx = GET_CONTEXT(ctx);
return (ctx->ctx_handler != NO_THREAD);
}
void
libusb_lock_event_waiters(libusb_context *ctx)
{
ctx = GET_CONTEXT(ctx);
CTX_LOCK(ctx);
}
void
libusb_unlock_event_waiters(libusb_context *ctx)
{
ctx = GET_CONTEXT(ctx);
CTX_UNLOCK(ctx);
}
int
libusb_wait_for_event(libusb_context *ctx, struct timeval *tv)
{
struct timespec ts;
int err;
ctx = GET_CONTEXT(ctx);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_wait_for_event enter");
if (tv == NULL) {
pthread_cond_wait(&ctx->ctx_cond,
&ctx->ctx_lock);
/* try to grab polling of actual events, if any */
if (ctx->ctx_handler == NO_THREAD)
ctx->ctx_handler = pthread_self();
return (0);
}
err = clock_gettime(CLOCK_MONOTONIC, &ts);
if (err < 0)
return (LIBUSB_ERROR_OTHER);
/*
* The "tv" arguments points to a relative time structure and
* not an absolute time structure.
*/
ts.tv_sec += tv->tv_sec;
ts.tv_nsec += tv->tv_usec * 1000;
if (ts.tv_nsec >= 1000000000) {
ts.tv_nsec -= 1000000000;
ts.tv_sec++;
}
err = pthread_cond_timedwait(&ctx->ctx_cond,
&ctx->ctx_lock, &ts);
/* try to grab polling of actual events, if any */
if (ctx->ctx_handler == NO_THREAD)
ctx->ctx_handler = pthread_self();
if (err == ETIMEDOUT)
return (1);
return (0);
}
int
libusb_handle_events_timeout_completed(libusb_context *ctx,
struct timeval *tv, int *completed)
{
int err = 0;
ctx = GET_CONTEXT(ctx);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout_completed enter");
libusb_lock_events(ctx);
while (1) {
if (completed != NULL) {
if (*completed != 0 || err != 0)
break;
}
err = libusb_handle_events_locked(ctx, tv);
if (completed == NULL)
break;
}
libusb_unlock_events(ctx);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_handle_events_timeout_completed exit");
return (err);
}
int
libusb_handle_events_completed(libusb_context *ctx, int *completed)
{
return (libusb_handle_events_timeout_completed(ctx, NULL, completed));
}
int
libusb_handle_events_timeout(libusb_context *ctx, struct timeval *tv)
{
return (libusb_handle_events_timeout_completed(ctx, tv, NULL));
}
int
libusb_handle_events(libusb_context *ctx)
{
return (libusb_handle_events_timeout_completed(ctx, NULL, NULL));
}
int
libusb_handle_events_locked(libusb_context *ctx, struct timeval *tv)
{
int err;
ctx = GET_CONTEXT(ctx);
if (libusb_event_handling_ok(ctx)) {
err = libusb10_handle_events_sub(ctx, tv);
} else {
err = libusb_wait_for_event(ctx, tv);
if (err != 0)
err = LIBUSB_ERROR_TIMEOUT;
}
return (err);
}
int
libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv)
{
/* all timeouts are currently being done by the kernel */
timerclear(tv);
return (0);
}
void
libusb_set_pollfd_notifiers(libusb_context *ctx,
libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,
void *user_data)
{
ctx = GET_CONTEXT(ctx);
ctx->fd_added_cb = added_cb;
ctx->fd_removed_cb = removed_cb;
ctx->fd_cb_user_data = user_data;
}
const struct libusb_pollfd **
libusb_get_pollfds(libusb_context *ctx)
{
struct libusb_super_pollfd *pollfd;
libusb_pollfd **ret;
int i;
ctx = GET_CONTEXT(ctx);
CTX_LOCK(ctx);
i = 0;
TAILQ_FOREACH(pollfd, &ctx->pollfds, entry)
i++;
ret = calloc(i + 1, sizeof(struct libusb_pollfd *));
if (ret == NULL)
goto done;
i = 0;
TAILQ_FOREACH(pollfd, &ctx->pollfds, entry)
ret[i++] = &pollfd->pollfd;
ret[i] = NULL;
done:
CTX_UNLOCK(ctx);
return ((const struct libusb_pollfd **)ret);
}
/* Synchronous device I/O */
int
libusb_control_transfer(libusb_device_handle *devh,
uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex,
uint8_t *data, uint16_t wLength, unsigned int timeout)
{
struct LIBUSB20_CONTROL_SETUP_DECODED req;
int err;
uint16_t actlen;
if (devh == NULL)
return (LIBUSB_ERROR_INVALID_PARAM);
if ((wLength != 0) && (data == NULL))
return (LIBUSB_ERROR_INVALID_PARAM);
LIBUSB20_INIT(LIBUSB20_CONTROL_SETUP, &req);
req.bmRequestType = bmRequestType;
req.bRequest = bRequest;
req.wValue = wValue;
req.wIndex = wIndex;
req.wLength = wLength;
err = libusb20_dev_request_sync(devh, &req, data,
&actlen, timeout, 0);
if (err == LIBUSB20_ERROR_PIPE)
return (LIBUSB_ERROR_PIPE);
else if (err == LIBUSB20_ERROR_TIMEOUT)
return (LIBUSB_ERROR_TIMEOUT);
else if (err)
return (LIBUSB_ERROR_NO_DEVICE);
return (actlen);
}
static libusb_context *
libusb10_get_context_by_device_handle(libusb_device_handle *devh)
{
libusb_context *ctx;
if (devh != NULL)
ctx = libusb_get_device(devh)->ctx;
else
ctx = NULL;
return (GET_CONTEXT(ctx));
}
static void
libusb10_do_transfer_cb(struct libusb_transfer *transfer)
{
libusb_context *ctx;
int *pdone;
ctx = libusb10_get_context_by_device_handle(transfer->dev_handle);
DPRINTF(ctx, LIBUSB_DEBUG_TRANSFER, "sync I/O done");
pdone = transfer->user_data;
*pdone = 1;
}
/*
* TODO: Replace the following function. Allocating and freeing on a
* per-transfer basis is slow. --HPS
*/
static int
libusb10_do_transfer(libusb_device_handle *devh,
uint8_t endpoint, uint8_t *data, int length,
int *transferred, unsigned int timeout, int type)
{
libusb_context *ctx;
struct libusb_transfer *xfer;
int done;
int ret;
if (devh == NULL)
return (LIBUSB_ERROR_INVALID_PARAM);
if ((length != 0) && (data == NULL))
return (LIBUSB_ERROR_INVALID_PARAM);
xfer = libusb_alloc_transfer(0);
if (xfer == NULL)
return (LIBUSB_ERROR_NO_MEM);
ctx = libusb_get_device(devh)->ctx;
xfer->dev_handle = devh;
xfer->endpoint = endpoint;
xfer->type = type;
xfer->timeout = timeout;
xfer->buffer = data;
xfer->length = length;
xfer->user_data = (void *)&done;
xfer->callback = libusb10_do_transfer_cb;
done = 0;
if ((ret = libusb_submit_transfer(xfer)) < 0) {
libusb_free_transfer(xfer);
return (ret);
}
while (done == 0) {
if ((ret = libusb_handle_events(ctx)) < 0) {
libusb_cancel_transfer(xfer);
usleep(1000); /* nice it */
}
}
*transferred = xfer->actual_length;
switch (xfer->status) {
case LIBUSB_TRANSFER_COMPLETED:
ret = 0;
break;
case LIBUSB_TRANSFER_TIMED_OUT:
ret = LIBUSB_ERROR_TIMEOUT;
break;
case LIBUSB_TRANSFER_OVERFLOW:
ret = LIBUSB_ERROR_OVERFLOW;
break;
case LIBUSB_TRANSFER_STALL:
ret = LIBUSB_ERROR_PIPE;
break;
case LIBUSB_TRANSFER_NO_DEVICE:
ret = LIBUSB_ERROR_NO_DEVICE;
break;
default:
ret = LIBUSB_ERROR_OTHER;
break;
}
libusb_free_transfer(xfer);
return (ret);
}
int
libusb_bulk_transfer(libusb_device_handle *devh,
uint8_t endpoint, uint8_t *data, int length,
int *transferred, unsigned int timeout)
{
libusb_context *ctx;
int ret;
ctx = libusb10_get_context_by_device_handle(devh);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer enter");
ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
timeout, LIBUSB_TRANSFER_TYPE_BULK);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_bulk_transfer leave");
return (ret);
}
int
libusb_interrupt_transfer(libusb_device_handle *devh,
uint8_t endpoint, uint8_t *data, int length,
int *transferred, unsigned int timeout)
{
libusb_context *ctx;
int ret;
ctx = libusb10_get_context_by_device_handle(devh);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer enter");
ret = libusb10_do_transfer(devh, endpoint, data, length, transferred,
timeout, LIBUSB_TRANSFER_TYPE_INTERRUPT);
DPRINTF(ctx, LIBUSB_DEBUG_FUNCTION, "libusb_interrupt_transfer leave");
return (ret);
}
uint8_t *
libusb_get_iso_packet_buffer(struct libusb_transfer *transfer, uint32_t off)
{
uint8_t *ptr;
uint32_t n;
if (transfer->num_iso_packets < 0)
return (NULL);
if (off >= (uint32_t)transfer->num_iso_packets)
return (NULL);
ptr = transfer->buffer;
if (ptr == NULL)
return (NULL);
for (n = 0; n != off; n++) {
ptr += transfer->iso_packet_desc[n].length;
}
return (ptr);
}
uint8_t *
libusb_get_iso_packet_buffer_simple(struct libusb_transfer *transfer, uint32_t off)
{
uint8_t *ptr;
if (transfer->num_iso_packets < 0)
return (NULL);
if (off >= (uint32_t)transfer->num_iso_packets)
return (NULL);
ptr = transfer->buffer;
if (ptr == NULL)
return (NULL);
ptr += transfer->iso_packet_desc[0].length * off;
return (ptr);
}
void
libusb_set_iso_packet_lengths(struct libusb_transfer *transfer, uint32_t length)
{
int n;
if (transfer->num_iso_packets < 0)
return;
for (n = 0; n != transfer->num_iso_packets; n++)
transfer->iso_packet_desc[n].length = length;
}
uint8_t *
libusb_control_transfer_get_data(struct libusb_transfer *transfer)
{
if (transfer->buffer == NULL)
return (NULL);
return (transfer->buffer + LIBUSB_CONTROL_SETUP_SIZE);
}
struct libusb_control_setup *
libusb_control_transfer_get_setup(struct libusb_transfer *transfer)
{
return ((struct libusb_control_setup *)transfer->buffer);
}
void
libusb_fill_control_setup(uint8_t *buf, uint8_t bmRequestType,
uint8_t bRequest, uint16_t wValue,
uint16_t wIndex, uint16_t wLength)
{
struct libusb_control_setup *req = (struct libusb_control_setup *)buf;
/* The alignment is OK for all fields below. */
req->bmRequestType = bmRequestType;
req->bRequest = bRequest;
req->wValue = htole16(wValue);
req->wIndex = htole16(wIndex);
req->wLength = htole16(wLength);
}
void
libusb_fill_control_transfer(struct libusb_transfer *transfer,
libusb_device_handle *devh, uint8_t *buf,
libusb_transfer_cb_fn callback, void *user_data,
uint32_t timeout)
{
struct libusb_control_setup *setup = (struct libusb_control_setup *)buf;
transfer->dev_handle = devh;
transfer->endpoint = 0;
transfer->type = LIBUSB_TRANSFER_TYPE_CONTROL;
transfer->timeout = timeout;
transfer->buffer = buf;
if (setup != NULL)
transfer->length = LIBUSB_CONTROL_SETUP_SIZE
+ le16toh(setup->wLength);
else
transfer->length = 0;
transfer->user_data = user_data;
transfer->callback = callback;
}
void
libusb_fill_bulk_transfer(struct libusb_transfer *transfer,
libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
int length, libusb_transfer_cb_fn callback, void *user_data,
uint32_t timeout)
{
transfer->dev_handle = devh;
transfer->endpoint = endpoint;
transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
transfer->timeout = timeout;
transfer->buffer = buf;
transfer->length = length;
transfer->user_data = user_data;
transfer->callback = callback;
}
void
libusb_fill_interrupt_transfer(struct libusb_transfer *transfer,
libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
int length, libusb_transfer_cb_fn callback, void *user_data,
uint32_t timeout)
{
transfer->dev_handle = devh;
transfer->endpoint = endpoint;
transfer->type = LIBUSB_TRANSFER_TYPE_INTERRUPT;
transfer->timeout = timeout;
transfer->buffer = buf;
transfer->length = length;
transfer->user_data = user_data;
transfer->callback = callback;
}
void
libusb_fill_iso_transfer(struct libusb_transfer *transfer,
libusb_device_handle *devh, uint8_t endpoint, uint8_t *buf,
int length, int npacket, libusb_transfer_cb_fn callback,
void *user_data, uint32_t timeout)
{
transfer->dev_handle = devh;
transfer->endpoint = endpoint;
transfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
transfer->timeout = timeout;
transfer->buffer = buf;
transfer->length = length;
transfer->num_iso_packets = npacket;
transfer->user_data = user_data;
transfer->callback = callback;
}
int
libusb_alloc_streams(libusb_device_handle *dev, uint32_t num_streams,
unsigned char *endpoints, int num_endpoints)
{
if (num_streams > 1)
return (LIBUSB_ERROR_INVALID_PARAM);
return (0);
}
int
libusb_free_streams(libusb_device_handle *dev, unsigned char *endpoints, int num_endpoints)
{
return (0);
}
void
libusb_transfer_set_stream_id(struct libusb_transfer *transfer, uint32_t stream_id)
{
struct libusb_super_transfer *sxfer;
if (transfer == NULL)
return;
sxfer = (struct libusb_super_transfer *)(
((uint8_t *)transfer) - sizeof(*sxfer));
/* set stream ID */
sxfer->stream_id = stream_id;
}
uint32_t
libusb_transfer_get_stream_id(struct libusb_transfer *transfer)
{
struct libusb_super_transfer *sxfer;
if (transfer == NULL)
return (0);
sxfer = (struct libusb_super_transfer *)(
((uint8_t *)transfer) - sizeof(*sxfer));
/* get stream ID */
return (sxfer->stream_id);
}
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