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/* $OpenBSD: vmmci.c,v 1.8 2020/06/24 22:03:40 cheloha Exp $ */
/*
* Copyright (c) 2017 Reyk Floeter <reyk@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/timeout.h>
#include <sys/signalvar.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/sensors.h>
#include <machine/bus.h>
#include <dev/pv/virtioreg.h>
#include <dev/pv/virtiovar.h>
#include <dev/pv/pvvar.h>
enum vmmci_cmd {
VMMCI_NONE = 0,
VMMCI_SHUTDOWN,
VMMCI_REBOOT,
VMMCI_SYNCRTC,
};
struct vmmci_softc {
struct device sc_dev;
struct virtio_softc *sc_virtio;
enum vmmci_cmd sc_cmd;
unsigned int sc_interval;
struct ksensordev sc_sensordev;
struct ksensor sc_sensor;
struct timeout sc_tick;
};
int vmmci_match(struct device *, void *, void *);
void vmmci_attach(struct device *, struct device *, void *);
int vmmci_activate(struct device *, int);
int vmmci_config_change(struct virtio_softc *);
void vmmci_tick(void *);
void vmmci_tick_hook(struct device *);
struct cfattach vmmci_ca = {
sizeof(struct vmmci_softc),
vmmci_match,
vmmci_attach,
NULL,
vmmci_activate
};
/* Configuration registers */
#define VMMCI_CONFIG_COMMAND 0
#define VMMCI_CONFIG_TIME_SEC 4
#define VMMCI_CONFIG_TIME_USEC 12
/* Feature bits */
#define VMMCI_F_TIMESYNC (1ULL<<0)
#define VMMCI_F_ACK (1ULL<<1)
#define VMMCI_F_SYNCRTC (1ULL<<2)
struct cfdriver vmmci_cd = {
NULL, "vmmci", DV_DULL
};
int
vmmci_match(struct device *parent, void *match, void *aux)
{
struct virtio_softc *va = aux;
if (va->sc_childdevid == PCI_PRODUCT_VIRTIO_VMMCI)
return (1);
return (0);
}
void
vmmci_attach(struct device *parent, struct device *self, void *aux)
{
struct vmmci_softc *sc = (struct vmmci_softc *)self;
struct virtio_softc *vsc = (struct virtio_softc *)parent;
if (vsc->sc_child != NULL)
panic("already attached to something else");
vsc->sc_child = self;
vsc->sc_nvqs = 0;
vsc->sc_config_change = vmmci_config_change;
vsc->sc_ipl = IPL_NET;
sc->sc_virtio = vsc;
vsc->sc_driver_features = VMMCI_F_TIMESYNC | VMMCI_F_ACK |
VMMCI_F_SYNCRTC;
virtio_negotiate_features(vsc, NULL);
if (virtio_has_feature(vsc, VMMCI_F_TIMESYNC)) {
strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensordev.xname));
sc->sc_sensor.type = SENSOR_TIMEDELTA;
sc->sc_sensor.status = SENSOR_S_UNKNOWN;
sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
sensordev_install(&sc->sc_sensordev);
config_mountroot(self, vmmci_tick_hook);
}
printf("\n");
}
int
vmmci_activate(struct device *self, int act)
{
struct vmmci_softc *sc = (struct vmmci_softc *)self;
struct virtio_softc *vsc = sc->sc_virtio;
if (virtio_has_feature(vsc, VMMCI_F_ACK) == 0)
return (0);
switch (act) {
case DVACT_POWERDOWN:
printf("%s: powerdown\n", sc->sc_dev.dv_xname);
/*
* Tell the host that we are shutting down. The host will
* start a timer and kill our VM if we didn't reboot before
* expiration. This avoids being stuck in the
* "Please press any key to reboot" handler on RB_HALT;
* without hooking into the MD code directly.
*/
virtio_write_device_config_4(vsc, VMMCI_CONFIG_COMMAND,
VMMCI_SHUTDOWN);
break;
default:
break;
}
return (0);
}
int
vmmci_config_change(struct virtio_softc *vsc)
{
struct vmmci_softc *sc = (struct vmmci_softc *)vsc->sc_child;
uint32_t cmd;
/* Check for command */
cmd = virtio_read_device_config_4(vsc, VMMCI_CONFIG_COMMAND);
if (cmd == sc->sc_cmd)
return (0);
sc->sc_cmd = cmd;
switch (cmd) {
case VMMCI_NONE:
/* no action */
break;
case VMMCI_SHUTDOWN:
pvbus_shutdown(&sc->sc_dev);
break;
case VMMCI_REBOOT:
pvbus_reboot(&sc->sc_dev);
break;
case VMMCI_SYNCRTC:
inittodr(gettime());
sc->sc_cmd = VMMCI_NONE;
break;
default:
printf("%s: invalid command %d\n", sc->sc_dev.dv_xname, cmd);
cmd = VMMCI_NONE;
break;
}
if ((cmd != VMMCI_NONE) && virtio_has_feature(vsc, VMMCI_F_ACK))
virtio_write_device_config_4(vsc, VMMCI_CONFIG_COMMAND, cmd);
return (1);
}
void
vmmci_tick(void *arg)
{
struct vmmci_softc *sc = arg;
struct virtio_softc *vsc = sc->sc_virtio;
struct timeval *guest = &sc->sc_sensor.tv;
struct timeval host, diff;
microtime(guest);
/* Update time delta sensor */
host.tv_sec = virtio_read_device_config_8(vsc, VMMCI_CONFIG_TIME_SEC);
host.tv_usec = virtio_read_device_config_8(vsc, VMMCI_CONFIG_TIME_USEC);
if (host.tv_usec > 0) {
timersub(guest, &host, &diff);
sc->sc_sensor.value = (uint64_t)diff.tv_sec * 1000000000LL +
(uint64_t)diff.tv_usec * 1000LL;
sc->sc_sensor.status = SENSOR_S_OK;
} else
sc->sc_sensor.status = SENSOR_S_UNKNOWN;
timeout_add_sec(&sc->sc_tick, 15);
}
void
vmmci_tick_hook(struct device *self)
{
struct vmmci_softc *sc = (struct vmmci_softc *)self;
timeout_set(&sc->sc_tick, vmmci_tick, sc);
vmmci_tick(sc);
}
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