It is tempting to use USB_RET_ASYNC for interrupt packets, rather then the
current NAK + polling approach, but this causes issues for migration, as
an async completed packet will not getting written back to guest memory until
the next poll time, and if a migration happens in between it will get lost!
Make an exception for host devices, because:
1) host-linux actually uses async completion for interrupt endpoints
2) host devices don't migrate anyways
Ideally we would convert host-linux.c to handle (input) interrupt endpoints in
a buffered manner like it does for isoc endpoints, keeping multiple urbs
submitted to ensure the devices timing requirements are met, as well as making
its interrupt ep handling the same as other usb-devices.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Now that we have separate status and length fields in USBPacket
update the completion tracepoint to log both.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
The Linux is more tolerant here as well: Just stop parsing the device
descriptors when an error is detected but do not reset what was found
so far. This allows to run buggy devices with partially invalid
descriptors.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Commit a844ed842d leads to usb-host
detecting devices not right after qemu startup because the guest
isn't running yet. Instead they are found on the first of the
regular usb device poll runs. Which is too late for seabios to see
them, so booting from usb sticks fails.
Fix this by adding a vm state change handler which triggers a device
scan when the vm is started.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Since with the ehci and xhci controllers a single packet can be larger
then maxpacketsize, it is possible for the result of a single packet
to be both having transferred some data as well as the transfer to have
an error.
An example would be an input transfer from a bulk endpoint successfully
receiving 1 or more maxpacketsize packets from the device, followed
by a packet signalling halt.
While already touching all the devices and controllers handle_packet /
handle_data / handle_control code, also change the return type of
these functions to void, solely storing the status in the packet. To
make the code paths for regular versus async packet handling more
uniform.
This patch unfortunately is somewhat invasive, since makeing the qemu
usb core deal with this requires changes everywhere. This patch only
prepares the usb core for this, all the hcd / device changes are done
in such a way that there are no functional changes.
This patch has been tested with uhci and ehci hcds, together with usb-audio,
usb-hid and usb-storage devices, as well as with usb-redir redirection
with a wide variety of real devices.
Note that there is usually no need to directly set packet->actual_length
form devices handle_data callback, as that is done by usb_packet_copy()
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
After a short-not-ok packet ending short, we should not advance the queue.
Move enforcing this to the core, rather then handling it in the hcd code.
This may result in the queue now actually containing multiple input packets
(which would not happen before), and this requires special handling in
combination with pipelining, so disable pipleining for input endpoints
(for now).
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
xhci needs this for USB_REQ_SET_ADDRESS due to the way
usb addressing is handled by the xhci hardware.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Need to clear p->result after copying setup data using usb_packet_copy()
because we'll reuse the USBPacket for the data transfer.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Replace iso transfer fprintf's with trace points. Also rename existing
tracepoints so they all match usb_host_iso_*.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Create a new usb_ep_reset() function to reset endpoint state, without
re-initialiting the queues, so we don't unlink in-flight packets just
because usb-host has to re-parse the descriptor tables.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Most important here is to update our internal endpoint state so we know
the endpoint isn't in halted state any more. Without this usb-host
tries to clear halt again with the next data transfer submitted. Doing
this twice is (a) not correct and (b) confuses some usb devices,
rendering them non-functional in the guest.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
usb-host optimizes away zero-length packets by not entering the
processing loop at all. Which isn't correct, we should submit a
zero-length urb to the host devicein that case. This patch makes
sure we run the processing loop at least once.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
usb-host assumes the first iovec element is always valid.
In case of a zero-length packet this isn't true though.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This patch carries a complete rewrite of the usb descriptor parser.
Changes / improvements:
* We are using the USBDescriptor struct instead of hard-coded offsets
now to access descriptor data.
* (debug) printfs are all gone, tracepoints have been added instead.
* We don't try (and fail) to skip over unneeded descriptors. We parse
them all one by one. We keep track of which configuration, interface
and altsetting we are looking at and use this information to figure
which desciptors are in use and which we can ignore.
* On parse errors we clear all endpoint information, which will
disallow any communication with the device, except control endpoint
messages. This makes sure we don't end up with a silly device state
where half of the endpoints got enabled and the other half was left
disabled.
* Some sanity checks have been added.
The new parser is more robust and also leaves complete device
information in the trace log if you enable the ush_host_parse_*
tracepoints.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Add pointer to USBPacket to all tracepoints tracking requests to make it
easier to identify them when multiple requests are in flight.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
When passing through a usb pendrive seabios will present it in the F12
boot menu and will happily boot from it.
This patch adds bootorder support so you can even make it the default
boot device.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reorganize usb source files. Create a new hw/usb/ directory and move
all usb source code to that place. Also make filenames a bit more
descriptive. Host adapters are prefixed with "hch-" now, usb device
emulations are prefixed with "dev-". Fixup paths Makefile and include
paths to make it compile. No code changes.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Paolo Bonzini
Hans de Goede
Gerd Hoffmann
Jan Kiszka