10  * the COPYING file in the top-level directory.
14 #include "chardev/char-fe.h"
15 #include "qemu/error-report.h"
17 #include "trace.h"
18 #include "hw/qdev-properties.h"
19 #include "hw/qdev-properties-system.h"
20 #include "hw/virtio/virtio-serial.h"
22 #include "qapi/qapi-events-char.h"
38  * Callback function that's called from chardevs when backend becomes
46     vcon->watch = 0;  in chr_write_unblocked()
58     if (!qemu_chr_fe_backend_connected(&vcon->chr)) {  in flush_buf()
59         /* If there's no backend, we can just say we consumed all data. */  in flush_buf()
63     ret = qemu_chr_fe_write(&vcon->chr, buf, len);  in flush_buf()
64     trace_virtio_console_flush_buf(port->id, len, ret);  in flush_buf()
70          * Ideally we'd get a better error code than just -1, but  in flush_buf()
72          * we had a finer-grained message, like -EPIPE, we could close  in flush_buf()
80          * console data on EAGAIN. The Linux virtio-console  in flush_buf()
82          * so if we enable throttling that'll stall the entire  in flush_buf()
92          * Linux virtio-console hvc driver to not hold spinlocks  in flush_buf()
98         if (!k->is_console) {  in flush_buf()
100             if (!vcon->watch) {  in flush_buf()
101                 vcon->watch = qemu_chr_fe_add_watch(&vcon->chr,  in flush_buf()
117     if (!k->is_console) {  in set_guest_connected()
118         qemu_chr_fe_set_open(&vcon->chr, guest_connected);  in set_guest_connected()
121     if (dev->id) {  in set_guest_connected()
122         qapi_event_send_vserport_change(dev->id, guest_connected);  in set_guest_connected()
130     qemu_chr_fe_accept_input(&vcon->chr);  in guest_writable()
147     trace_virtio_console_chr_read(port->id, size);  in chr_read()
156     trace_virtio_console_chr_event(port->id, event);  in chr_event()
162         if (vcon->watch) {  in chr_event()
163             g_source_remove(vcon->watch);  in chr_event()
164             vcon->watch = 0;  in chr_event()
182     if (k->is_console) {  in chr_be_change()
183         qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,  in chr_be_change()
186         qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,  in chr_be_change()
190     if (vcon->watch) {  in chr_be_change()
191         g_source_remove(vcon->watch);  in chr_be_change()
192         vcon->watch = qemu_chr_fe_add_watch(&vcon->chr,  in chr_be_change()
200 static void virtconsole_enable_backend(VirtIOSerialPort *port, bool enable)  in virtconsole_enable_backend()  argument
204     if (!qemu_chr_fe_backend_connected(&vcon->chr)) {  in virtconsole_enable_backend()
208     if (enable) {  in virtconsole_enable_backend()
211         qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,  in virtconsole_enable_backend()
212                                  k->is_console ? NULL : chr_event,  in virtconsole_enable_backend()
215         qemu_chr_fe_set_handlers(&vcon->chr, NULL, NULL, NULL,  in virtconsole_enable_backend()
226     if (port->id == 0 && !k->is_console) {  in virtconsole_realize()
227         error_setg(errp, "Port number 0 on virtio-serial devices reserved "  in virtconsole_realize()
232     if (qemu_chr_fe_backend_connected(&vcon->chr)) {  in virtconsole_realize()
235          * because nothing is connected - we'll just let it go  in virtconsole_realize()
236          * whetherever the chardev wants - /dev/null probably.  in virtconsole_realize()
242         if (k->is_console) {  in virtconsole_realize()
243             qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,  in virtconsole_realize()
248             qemu_chr_fe_set_handlers(&vcon->chr, chr_can_read, chr_read,  in virtconsole_realize()
259     if (vcon->watch) {  in virtconsole_unrealize()
260         g_source_remove(vcon->watch);  in virtconsole_unrealize()
268     k->is_console = true;  in virtconsole_class_init()
286     k->realize = virtconsole_realize;  in virtserialport_class_init()
287     k->unrealize = virtconsole_unrealize;  in virtserialport_class_init()
288     k->have_data = flush_buf;  in virtserialport_class_init()
289     k->set_guest_connected = set_guest_connected;  in virtserialport_class_init()
290     k->enable_backend = virtconsole_enable_backend;  in virtserialport_class_init()
291     k->guest_writable = guest_writable;  in virtserialport_class_init()