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usb-host: wire up timer for windows

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On windows we can't wait on file descriptors.
Poll libusb using a timer instead.

Fixes long-standing FIXME.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/431
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-Id: <20210623085249.1151901-2-kraxel@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2021-06-23 10:52:48 +02:00
parent f2da205cb4
commit 663fdc815e
1 changed files with 32 additions and 1 deletions
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33
hw/usb/host-libusb.c
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@ -254,6 +254,29 @@ static void usb_host_del_fd(int fd, void *user_data)
qemu_set_fd_handler(fd, NULL, NULL, NULL);
}
#else
static QEMUTimer *poll_timer;
static uint32_t request_count;
static void usb_host_timer_kick(void)
{
int64_t delay_ns;
delay_ns = request_count
? (NANOSECONDS_PER_SECOND / 100) /* 10 ms interval with active req */
: (NANOSECONDS_PER_SECOND); /* 1 sec interval otherwise */
timer_mod(poll_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + delay_ns);
}
static void usb_host_timer(void *opaque)
{
struct timeval tv = { 0, 0 };
libusb_handle_events_timeout(ctx, &tv);
usb_host_timer_kick();
}
#endif /* !CONFIG_WIN32 */
static int usb_host_init(void)
@ -276,7 +299,8 @@ static int usb_host_init(void)
libusb_set_debug(ctx, loglevel);
#endif
#ifdef CONFIG_WIN32
/* FIXME: add support for Windows. */
poll_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, usb_host_timer, NULL);
usb_host_timer_kick();
#else
libusb_set_pollfd_notifiers(ctx, usb_host_add_fd,
usb_host_del_fd,
@ -364,11 +388,18 @@ static USBHostRequest *usb_host_req_alloc(USBHostDevice *s, USBPacket *p,
r->buffer = g_malloc(bufsize);
}
QTAILQ_INSERT_TAIL(&s->requests, r, next);
#ifdef CONFIG_WIN32
request_count++;
usb_host_timer_kick();
#endif
return r;
}
static void usb_host_req_free(USBHostRequest *r)
{
#ifdef CONFIG_WIN32
request_count--;
#endif
QTAILQ_REMOVE(&r->host->requests, r, next);
libusb_free_transfer(r->xfer);
g_free(r->buffer);