RE: [Qemu-devel] USB Asynchronous I/O

[Arnon Gilboa]

I believe you can do it similar to the way I did for isochronous
transfers in usb-linux.c.
Remember that using SUBMITURB and REAPURBNDELAY ioctls, you need to add
another signal and signal handler for the async bulk, and there might be
some issues in the ohci/uhci because they currently assume only
isochronous transfers are async. A minute ago I tried to implement the
bulk transfers using SUBMITURB and REAPURB (which blocks until response)
but it seems to hang qemu upon connecting a disk-on-key.

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Salil Bijur
Sent: Wednesday, November 14, 2007 11:49 PM
To: address@hidden
Subject: [Qemu-devel] USB Asynchronous I/O

Hello,

I've been testing Bluetooth-USB in QEMU for an arm-based processor with
a Linux guest.

When a bluetooth dongle is added, there is a continuous sending of bulk
and interrupt packets synchronously (using the USBDEVFS_BULK
ioctl) making qemu extremely slow and unusable.
I wanted to know if it is a good idea to send these bulk and interrupt
transfers asynchronously using the SUBMITURB and REAPURBNDELAY ioctls in
a way similar as isochronous transfers in usb-linux.c.
Is there any reason why only isochronous packets are being sent
asynchronously when the same can be done for other types?

Thanks,
Salil