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freebsd-skq/usr.sbin/bhyve/ps2mouse.c
jhb d3e4e51223 Initial support for bhyve save and restore. 
Save and restore (also known as suspend and resume) permits a snapshot
to be taken of a guest's state that can later be resumed.  In the
current implementation, bhyve(8) creates a UNIX domain socket that is
used by bhyvectl(8) to send a request to save a snapshot (and
optionally exit after the snapshot has been taken).  A snapshot
currently consists of two files: the first holds a copy of guest RAM,
and the second file holds other guest state such as vCPU register
values and device model state.

To resume a guest, bhyve(8) must be started with a matching pair of
command line arguments to instantiate the same set of device models as
well as a pointer to the saved snapshot.

While the current implementation is useful for several uses cases, it
has a few limitations.  The file format for saving the guest state is
tied to the ABI of internal bhyve structures and is not
self-describing (in that it does not communicate the set of device
models present in the system).  In addition, the state saved for some
device models closely matches the internal data structures which might
prove a challenge for compatibility of snapshot files across a range
of bhyve versions.  The file format also does not currently support
versioning of individual chunks of state.  As a result, the current
file format is not a fixed binary format and future revisions to save
and restore will break binary compatiblity of snapshot files.  The
goal is to move to a more flexible format that adds versioning,
etc. and at that point to commit to providing a reasonable level of
compatibility.  As a result, the current implementation is not enabled
by default.  It can be enabled via the WITH_BHYVE_SNAPSHOT=yes option
for userland builds, and the kernel option BHYVE_SHAPSHOT.

Submitted by:	Mihai Tiganus, Flavius Anton, Darius Mihai
Submitted by:	Elena Mihailescu, Mihai Carabas, Sergiu Weisz
Relnotes:	yes
Sponsored by:	University Politehnica of Bucharest
Sponsored by:	Matthew Grooms (student scholarships)
Sponsored by:	iXsystems
Differential Revision:	https://reviews.freebsd.org/D19495
2020-05-05 00:02:04 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2015 Tycho Nightingale <tycho.nightingale@pluribusnetworks.com>
* Copyright (c) 2015 Nahanni Systems Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <machine/vmm_snapshot.h>
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <pthread.h>
#include <pthread_np.h>
#include "atkbdc.h"
#include "debug.h"
#include "console.h"
/* mouse device commands */
#define PS2MC_RESET_DEV 0xff
#define PS2MC_SET_DEFAULTS 0xf6
#define PS2MC_DISABLE 0xf5
#define PS2MC_ENABLE 0xf4
#define PS2MC_SET_SAMPLING_RATE 0xf3
#define PS2MC_SEND_DEV_ID 0xf2
#define PS2MC_SET_REMOTE_MODE 0xf0
#define PS2MC_SEND_DEV_DATA 0xeb
#define PS2MC_SET_STREAM_MODE 0xea
#define PS2MC_SEND_DEV_STATUS 0xe9
#define PS2MC_SET_RESOLUTION 0xe8
#define PS2MC_SET_SCALING1 0xe7
#define PS2MC_SET_SCALING2 0xe6
#define PS2MC_BAT_SUCCESS 0xaa
#define PS2MC_ACK 0xfa
/* mouse device id */
#define PS2MOUSE_DEV_ID 0x0
/* mouse data bits */
#define PS2M_DATA_Y_OFLOW 0x80
#define PS2M_DATA_X_OFLOW 0x40
#define PS2M_DATA_Y_SIGN 0x20
#define PS2M_DATA_X_SIGN 0x10
#define PS2M_DATA_AONE 0x08
#define PS2M_DATA_MID_BUTTON 0x04
#define PS2M_DATA_RIGHT_BUTTON 0x02
#define PS2M_DATA_LEFT_BUTTON 0x01
/* mouse status bits */
#define PS2M_STS_REMOTE_MODE 0x40
#define PS2M_STS_ENABLE_DEV 0x20
#define PS2M_STS_SCALING_21 0x10
#define PS2M_STS_MID_BUTTON 0x04
#define PS2M_STS_RIGHT_BUTTON 0x02
#define PS2M_STS_LEFT_BUTTON 0x01
#define PS2MOUSE_FIFOSZ 16
struct fifo {
uint8_t buf[PS2MOUSE_FIFOSZ];
int rindex; /* index to read from */
int windex; /* index to write to */
int num; /* number of bytes in the fifo */
int size; /* size of the fifo */
};
struct ps2mouse_softc {
struct atkbdc_softc *atkbdc_sc;
pthread_mutex_t mtx;
uint8_t status;
uint8_t resolution;
uint8_t sampling_rate;
int ctrlenable;
struct fifo fifo;
uint8_t curcmd; /* current command for next byte */
int cur_x, cur_y;
int delta_x, delta_y;
};
static void
fifo_init(struct ps2mouse_softc *sc)
{
struct fifo *fifo;
fifo = &sc->fifo;
fifo->size = sizeof(((struct fifo *)0)->buf);
}
static void
fifo_reset(struct ps2mouse_softc *sc)
{
struct fifo *fifo;
fifo = &sc->fifo;
bzero(fifo, sizeof(struct fifo));
fifo->size = sizeof(((struct fifo *)0)->buf);
}
static void
fifo_put(struct ps2mouse_softc *sc, uint8_t val)
{
struct fifo *fifo;
fifo = &sc->fifo;
if (fifo->num < fifo->size) {
fifo->buf[fifo->windex] = val;
fifo->windex = (fifo->windex + 1) % fifo->size;
fifo->num++;
}
}
static int
fifo_get(struct ps2mouse_softc *sc, uint8_t *val)
{
struct fifo *fifo;
fifo = &sc->fifo;
if (fifo->num > 0) {
*val = fifo->buf[fifo->rindex];
fifo->rindex = (fifo->rindex + 1) % fifo->size;
fifo->num--;
return (0);
}
return (-1);
}
static void
movement_reset(struct ps2mouse_softc *sc)
{
assert(pthread_mutex_isowned_np(&sc->mtx));
sc->delta_x = 0;
sc->delta_y = 0;
}
static void
movement_update(struct ps2mouse_softc *sc, int x, int y)
{
sc->delta_x += x - sc->cur_x;
sc->delta_y += sc->cur_y - y;
sc->cur_x = x;
sc->cur_y = y;
}
static void
movement_get(struct ps2mouse_softc *sc)
{
uint8_t val0, val1, val2;
assert(pthread_mutex_isowned_np(&sc->mtx));
val0 = PS2M_DATA_AONE;
val0 |= sc->status & (PS2M_DATA_LEFT_BUTTON |
PS2M_DATA_RIGHT_BUTTON | PS2M_DATA_MID_BUTTON);
if (sc->delta_x >= 0) {
if (sc->delta_x > 255) {
val0 |= PS2M_DATA_X_OFLOW;
val1 = 255;
} else
val1 = sc->delta_x;
} else {
val0 |= PS2M_DATA_X_SIGN;
if (sc->delta_x < -255) {
val0 |= PS2M_DATA_X_OFLOW;
val1 = 255;
} else
val1 = sc->delta_x;
}
sc->delta_x = 0;
if (sc->delta_y >= 0) {
if (sc->delta_y > 255) {
val0 |= PS2M_DATA_Y_OFLOW;
val2 = 255;
} else
val2 = sc->delta_y;
} else {
val0 |= PS2M_DATA_Y_SIGN;
if (sc->delta_y < -255) {
val0 |= PS2M_DATA_Y_OFLOW;
val2 = 255;
} else
val2 = sc->delta_y;
}
sc->delta_y = 0;
if (sc->fifo.num < (sc->fifo.size - 3)) {
fifo_put(sc, val0);
fifo_put(sc, val1);
fifo_put(sc, val2);
}
}
static void
ps2mouse_reset(struct ps2mouse_softc *sc)
{
assert(pthread_mutex_isowned_np(&sc->mtx));
fifo_reset(sc);
movement_reset(sc);
sc->status = PS2M_STS_ENABLE_DEV;
sc->resolution = 4;
sc->sampling_rate = 100;
sc->cur_x = 0;
sc->cur_y = 0;
sc->delta_x = 0;
sc->delta_y = 0;
}
int
ps2mouse_read(struct ps2mouse_softc *sc, uint8_t *val)
{
int retval;
pthread_mutex_lock(&sc->mtx);
retval = fifo_get(sc, val);
pthread_mutex_unlock(&sc->mtx);
return (retval);
}
int
ps2mouse_fifocnt(struct ps2mouse_softc *sc)
{
return (sc->fifo.num);
}
void
ps2mouse_toggle(struct ps2mouse_softc *sc, int enable)
{
pthread_mutex_lock(&sc->mtx);
if (enable)
sc->ctrlenable = 1;
else {
sc->ctrlenable = 0;
sc->fifo.rindex = 0;
sc->fifo.windex = 0;
sc->fifo.num = 0;
}
pthread_mutex_unlock(&sc->mtx);
}
void
ps2mouse_write(struct ps2mouse_softc *sc, uint8_t val, int insert)
{
pthread_mutex_lock(&sc->mtx);
fifo_reset(sc);
if (sc->curcmd) {
switch (sc->curcmd) {
case PS2MC_SET_SAMPLING_RATE:
sc->sampling_rate = val;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_SET_RESOLUTION:
sc->resolution = val;
fifo_put(sc, PS2MC_ACK);
break;
default:
EPRINTLN("Unhandled ps2 mouse current "
"command byte 0x%02x", val);
break;
}
sc->curcmd = 0;
} else if (insert) {
fifo_put(sc, val);
} else {
switch (val) {
case 0x00:
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_RESET_DEV:
ps2mouse_reset(sc);
fifo_put(sc, PS2MC_ACK);
fifo_put(sc, PS2MC_BAT_SUCCESS);
fifo_put(sc, PS2MOUSE_DEV_ID);
break;
case PS2MC_SET_DEFAULTS:
ps2mouse_reset(sc);
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_DISABLE:
fifo_reset(sc);
sc->status &= ~PS2M_STS_ENABLE_DEV;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_ENABLE:
fifo_reset(sc);
sc->status |= PS2M_STS_ENABLE_DEV;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_SET_SAMPLING_RATE:
sc->curcmd = val;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_SEND_DEV_ID:
fifo_put(sc, PS2MC_ACK);
fifo_put(sc, PS2MOUSE_DEV_ID);
break;
case PS2MC_SET_REMOTE_MODE:
sc->status |= PS2M_STS_REMOTE_MODE;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_SEND_DEV_DATA:
fifo_put(sc, PS2MC_ACK);
movement_get(sc);
break;
case PS2MC_SET_STREAM_MODE:
sc->status &= ~PS2M_STS_REMOTE_MODE;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_SEND_DEV_STATUS:
fifo_put(sc, PS2MC_ACK);
fifo_put(sc, sc->status);
fifo_put(sc, sc->resolution);
fifo_put(sc, sc->sampling_rate);
break;
case PS2MC_SET_RESOLUTION:
sc->curcmd = val;
fifo_put(sc, PS2MC_ACK);
break;
case PS2MC_SET_SCALING1:
case PS2MC_SET_SCALING2:
fifo_put(sc, PS2MC_ACK);
break;
default:
fifo_put(sc, PS2MC_ACK);
EPRINTLN("Unhandled ps2 mouse command "
"0x%02x", val);
break;
}
}
pthread_mutex_unlock(&sc->mtx);
}
static void
ps2mouse_event(uint8_t button, int x, int y, void *arg)
{
struct ps2mouse_softc *sc = arg;
pthread_mutex_lock(&sc->mtx);
movement_update(sc, x, y);
sc->status &= ~(PS2M_STS_LEFT_BUTTON |
PS2M_STS_RIGHT_BUTTON | PS2M_STS_MID_BUTTON);
if (button & (1 << 0))
sc->status |= PS2M_STS_LEFT_BUTTON;
if (button & (1 << 1))
sc->status |= PS2M_STS_MID_BUTTON;
if (button & (1 << 2))
sc->status |= PS2M_STS_RIGHT_BUTTON;
if ((sc->status & PS2M_STS_ENABLE_DEV) == 0 || !sc->ctrlenable) {
/* no data reporting */
pthread_mutex_unlock(&sc->mtx);
return;
}
movement_get(sc);
pthread_mutex_unlock(&sc->mtx);
if (sc->fifo.num > 0)
atkbdc_event(sc->atkbdc_sc, 0);
}
struct ps2mouse_softc *
ps2mouse_init(struct atkbdc_softc *atkbdc_sc)
{
struct ps2mouse_softc *sc;
sc = calloc(1, sizeof (struct ps2mouse_softc));
pthread_mutex_init(&sc->mtx, NULL);
fifo_init(sc);
sc->atkbdc_sc = atkbdc_sc;
pthread_mutex_lock(&sc->mtx);
ps2mouse_reset(sc);
pthread_mutex_unlock(&sc->mtx);
console_ptr_register(ps2mouse_event, sc, 1);
return (sc);
}
#ifdef BHYVE_SNAPSHOT
int
ps2mouse_snapshot(struct ps2mouse_softc *sc, struct vm_snapshot_meta *meta)
{
int ret;
SNAPSHOT_VAR_OR_LEAVE(sc->status, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->resolution, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->sampling_rate, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->ctrlenable, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->curcmd, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->cur_x, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->cur_y, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->delta_x, meta, ret, done);
SNAPSHOT_VAR_OR_LEAVE(sc->delta_y, meta, ret, done);
done:
return (ret);
}
#endif
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