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2017-02-20Add wctablet deviceAnatoli Huseu11-0/+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
2017-02-16char: drop data written to a disconnected ptyEd Swierk1-1/+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>
2017-02-16qemu-char: socket backend: disconnect on write errorAnton Nefedov1-0/+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>
2017-01-31char: headers clean-upMarc-André Lureau1-39/+1
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>
2017-01-31char: move parallel chardev in its own fileMarc-André Lureau4-286/+350
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move serial chardev to its own fileMarc-André Lureau4-276/+356
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move pty chardev in its own fileMarc-André Lureau3-258/+301
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move pipe chardev in its own fileMarc-André Lureau3-166/+192
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move console in its own fileMarc-André Lureau3-3/+54
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move stdio in its own fileMarc-André Lureau3-120/+165
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move file chardev in its own fileMarc-André Lureau3-106/+140
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move udp chardev in its own fileMarc-André Lureau3-198/+234
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move socket chardev to its own fileMarc-André Lureau3-978/+1019
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move win-stdio into its own fileMarc-André Lureau4-229/+298
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move win chardev base class in its own fileMarc-André Lureau4-250/+322
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move fd chardev in its own fileMarc-André Lureau4-145/+217
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Acked-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move QIOChannel-related stuff to char-io.hMarc-André Lureau4-173/+240
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2017-01-31char: remove unused READ_RETRIESMarc-André Lureau1-1/+0
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>
2017-01-31char: rename and move to header CHR_READ_BUF_LENMarc-André Lureau1-7/+6
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>
2017-01-31char: move ringbuf/memory to its own fileMarc-André Lureau3-218/+250
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2017-01-31char: move mux to its own fileMarc-André Lureau4-349/+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>
2017-01-31char: move null chardev to its own fileMarc-André Lureau3-23/+55
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
2017-01-31char: make null_chr_write() the default methodMarc-André Lureau1-8/+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>
2017-01-31char: create chardev-obj-yMarc-André Lureau1-1/+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>
2017-01-31char: move to chardev/Marc-André Lureau2-0/+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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