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* Add wctablet deviceAnatoli Huseu12017-02-201-0/+1
| | | | | | | | | | | | | | | Add QEMU Wacom Penpartner serial tablet emulation. GSoC 2016 project. Signed-off-by: Anatoli Huseu1 <avg.tolik@gmail.com> Various cleanups. Add line speed tracking. Implement ST and SP commands. Adapted to chardev QOMification. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Message-id: 1486391007-10116-1-git-send-email-kraxel@redhat.com
* char: drop data written to a disconnected ptyEd Swierk2017-02-161-1/+1
| | | | | | | | | | | | | When a serial port writes data to a pty that's disconnected, drop the data and return the length dropped. This avoids triggering pointless retries in callers like the 16550A serial_xmit(), and causes qemu_chr_fe_write() to write all data to the log file, rather than logging only while a pty client like virsh console happens to be connected. Signed-off-by: Ed Swierk <eswierk@skyportsystems.com> Message-Id: <1485870329-79428-1-git-send-email-eswierk@skyportsystems.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* qemu-char: socket backend: disconnect on write errorAnton Nefedov2017-02-161-0/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Socket backend read handler should normally perform a disconnect, however the read handler may not get a chance to run if the frontend is not ready (qemu_chr_be_can_write() == 0). This means that in virtio-serial frontend case if - the host has disconnected (giving EPIPE on socket write) - and the guest has disconnected (-> frontend not ready -> backend will not read) - and there is still data (frontend->backend) to flush (has to be a really tricky timing but nevertheless, we have observed the case in production) This results in virtio-serial trying to flush this data continiously forming a busy loop. Solution: react on write error in the socket write handler. errno is not reliable after qio_channel_writev_full(), so we may not get the exact EPIPE, so disconnect on any error but QIO_CHANNEL_ERR_BLOCK which io_channel_send_full() converts to errno EAGAIN. We must not disconnect right away though, there still may be data to read (see 4bf1cb0). Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Paolo Bonzini <pbonzini@redhat.com> CC: Daniel P. Berrange <berrange@redhat.com> CC: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <1486045589-8074-1-git-send-email-den@openvz.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
* char: headers clean-upMarc-André Lureau2017-01-311-39/+1Star
| | | | | | | | | Those could probably be squashed with earlier patches, however I couldn't easily identify them, test them or check if there are still necessary on various platforms. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: move parallel chardev in its own fileMarc-André Lureau2017-01-314-286/+350
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move serial chardev to its own fileMarc-André Lureau2017-01-314-276/+356
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move pty chardev in its own fileMarc-André Lureau2017-01-313-258/+301
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move pipe chardev in its own fileMarc-André Lureau2017-01-313-166/+192
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move console in its own fileMarc-André Lureau2017-01-313-3/+54
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move stdio in its own fileMarc-André Lureau2017-01-313-120/+165
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move file chardev in its own fileMarc-André Lureau2017-01-313-106/+140
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move udp chardev in its own fileMarc-André Lureau2017-01-313-198/+234
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move socket chardev to its own fileMarc-André Lureau2017-01-313-978/+1019
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move win-stdio into its own fileMarc-André Lureau2017-01-314-229/+298
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move win chardev base class in its own fileMarc-André Lureau2017-01-314-250/+322
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move fd chardev in its own fileMarc-André Lureau2017-01-314-145/+217
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
* char: move QIOChannel-related stuff to char-io.hMarc-André Lureau2017-01-314-173/+240
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: remove unused READ_RETRIESMarc-André Lureau2017-01-311-1/+0Star
| | | | | | | Curiously unused since its introduction in commit 7b0bfdf52d69. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: rename and move to header CHR_READ_BUF_LENMarc-André Lureau2017-01-311-7/+6Star
| | | | | | | | This define is used by several character devices, place it in char common header. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: move ringbuf/memory to its own fileMarc-André Lureau2017-01-313-218/+250
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: move mux to its own fileMarc-André Lureau2017-01-314-349/+425
| | | | | | | | A mechanical move, except that qemu_chr_write_all() needs to be declared in char.h header to be used from chardev unit files. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: move null chardev to its own fileMarc-André Lureau2017-01-313-23/+55
| | | | | Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: make null_chr_write() the default methodMarc-André Lureau2017-01-311-8/+13
| | | | | | | | | All chardev must implement chr_write(), but parallel and null chardev both use null_chr_write(). Move it to the base class, so we don't need to export the function when splitting the chardev in respective files. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: create chardev-obj-yMarc-André Lureau2017-01-311-1/+1
| | | | | | | | This will help to split char.c in several units without having to reference them all everywhere. This is useful in particular for tests. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
* char: move to chardev/Marc-André Lureau2017-01-312-0/+5133
The following commits will split char.c in several files. Let's put them in a subdirectory. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
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