Several minor changes to hopefully complete the VirtIO console driver
- Support the KDB alt break sequence to enter the debugger, panic, reboot, etc. [1] - Provide emergency write feature description. Note that QEMU does not implement this feature. - Make the VTCON_FLAG_* defines sequential once again. - When the multiple port feature is not negotiated, query the rows and columns of the one console during the device attach when the size feature is negotiated. - Report failure to the device if hot plugging a port fails. - Acknowledge the console port event with an open event. This is required by the spec, but QEMU doesn't seem to care. Submitted by: Juniper [1] MFC after: 1 month
This commit is contained in:
parent
6fea8dc88f
commit
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=274215
@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/kdb.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sglist.h>
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@ -78,6 +79,11 @@ struct vtcon_port {
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int vtcport_id;
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int vtcport_flags;
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#define VTCON_PORT_FLAG_GONE 0x01
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#define VTCON_PORT_FLAG_CONSOLE 0x02
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#if defined(KDB)
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int vtcport_alt_break_state;
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#endif
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};
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#define VTCON_PORT_LOCK(_port) mtx_lock(&(_port)->vtcport_mtx)
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@ -94,17 +100,11 @@ struct vtcon_softc {
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device_t vtcon_dev;
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struct mtx vtcon_mtx;
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uint64_t vtcon_features;
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uint32_t vtcon_flags;
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#define VTCON_FLAG_DETACHED 0x0001
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#define VTCON_FLAG_SIZE 0x0010
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#define VTCON_FLAG_MULTIPORT 0x0020
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struct task vtcon_ctrl_task;
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struct virtqueue *vtcon_ctrl_rxvq;
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struct virtqueue *vtcon_ctrl_txvq;
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struct mtx vtcon_ctrl_tx_mtx;
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uint32_t vtcon_max_ports;
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uint32_t vtcon_flags;
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#define VTCON_FLAG_DETACHED 0x01
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#define VTCON_FLAG_SIZE 0x02
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#define VTCON_FLAG_MULTIPORT 0x04
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/*
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* Ports can be added and removed during runtime, but we have
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@ -112,6 +112,11 @@ struct vtcon_softc {
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* indexed by the port ID.
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*/
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struct vtcon_softc_port *vtcon_ports;
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struct task vtcon_ctrl_task;
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struct virtqueue *vtcon_ctrl_rxvq;
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struct virtqueue *vtcon_ctrl_txvq;
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struct mtx vtcon_ctrl_tx_mtx;
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};
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#define VTCON_LOCK(_sc) mtx_lock(&(_sc)->vtcon_mtx)
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@ -133,6 +138,7 @@ struct vtcon_softc {
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static struct virtio_feature_desc vtcon_feature_desc[] = {
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{ VIRTIO_CONSOLE_F_SIZE, "ConsoleSize" },
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{ VIRTIO_CONSOLE_F_MULTIPORT, "MultiplePorts" },
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{ VIRTIO_CONSOLE_F_EMERG_WRITE, "EmergencyWrite" },
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{ 0, NULL }
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};
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@ -331,10 +337,15 @@ vtcon_attach(device_t dev)
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if (sc->vtcon_flags & VTCON_FLAG_MULTIPORT) {
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TASK_INIT(&sc->vtcon_ctrl_task, 0, vtcon_ctrl_task_cb, sc);
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error = vtcon_ctrl_init(sc);
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} else
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if (error)
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goto fail;
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} else {
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error = vtcon_port_create(sc, 0);
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if (error)
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goto fail;
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if (sc->vtcon_flags & VTCON_FLAG_SIZE)
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vtcon_port_update_console_size(sc);
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}
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error = virtio_setup_intr(dev, INTR_TYPE_TTY);
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if (error) {
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@ -703,6 +714,7 @@ vtcon_ctrl_port_add_event(struct vtcon_softc *sc, int id)
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if (error) {
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device_printf(dev, "%s: cannot create port %d: %d\n",
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__func__, id, error);
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vtcon_ctrl_send_control(sc, id, VIRTIO_CONSOLE_PORT_READY, 0);
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return;
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}
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}
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@ -735,9 +747,27 @@ vtcon_ctrl_port_remove_event(struct vtcon_softc *sc, int id)
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static void
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vtcon_ctrl_port_console_event(struct vtcon_softc *sc, int id)
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{
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device_t dev;
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struct vtcon_softc_port *scport;
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struct vtcon_port *port;
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device_printf(sc->vtcon_dev, "%s: port %d console event\n",
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dev = sc->vtcon_dev;
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scport = &sc->vtcon_ports[id];
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VTCON_LOCK(sc);
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port = scport->vcsp_port;
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if (port == NULL) {
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VTCON_UNLOCK(sc);
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device_printf(dev, "%s: console port %d, but does not exist\n",
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__func__, id);
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return;
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}
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VTCON_PORT_LOCK(port);
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VTCON_UNLOCK(sc);
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port->vtcport_flags |= VTCON_PORT_FLAG_CONSOLE;
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vtcon_port_submit_event(port, VIRTIO_CONSOLE_PORT_OPEN, 1);
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VTCON_PORT_UNLOCK(port);
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}
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static void
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@ -1179,8 +1209,14 @@ vtcon_port_in(struct vtcon_port *port)
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deq = 0;
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while ((buf = virtqueue_dequeue(vq, &len)) != NULL) {
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for (i = 0; i < len; i++)
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for (i = 0; i < len; i++) {
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#if defined(KDB)
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if (port->vtcport_flags & VTCON_PORT_FLAG_CONSOLE)
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kdb_alt_break(buf[i],
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&port->vtcport_alt_break_state);
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#endif
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ttydisc_rint(tp, buf[i], 0);
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}
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vtcon_port_requeue_buf(port, buf);
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deq++;
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}
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