qemu/hw/s390x/event-facility.c

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/*
* SCLP
* Event Facility
* handles SCLP event types
* - Signal Quiesce - system power down
* - ASCII Console Data - VT220 read and write
*
* Copyright IBM, Corp. 2012
*
* Authors:
* Heinz Graalfs <graalfs@de.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at your
* option) any later version. See the COPYING file in the top-level directory.
*
*/
#include "monitor/monitor.h"
#include "sysemu/sysemu.h"
#include "sclp.h"
#include "event-facility.h"
typedef struct EventTypesBus {
BusState qbus;
} EventTypesBus;
struct SCLPEventFacility {
EventTypesBus sbus;
DeviceState *qdev;
/* guest' receive mask */
unsigned int receive_mask;
};
/* return true if any child has event pending set */
static bool event_pending(SCLPEventFacility *ef)
{
BusChild *kid;
SCLPEvent *event;
SCLPEventClass *event_class;
QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
DeviceState *qdev = kid->child;
event = DO_UPCAST(SCLPEvent, qdev, qdev);
event_class = SCLP_EVENT_GET_CLASS(event);
if (event->event_pending &&
event_class->get_send_mask() & ef->receive_mask) {
return true;
}
}
return false;
}
static unsigned int get_host_send_mask(SCLPEventFacility *ef)
{
unsigned int mask;
BusChild *kid;
SCLPEventClass *child;
mask = 0;
QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
DeviceState *qdev = kid->child;
child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
mask |= child->get_send_mask();
}
return mask;
}
static unsigned int get_host_receive_mask(SCLPEventFacility *ef)
{
unsigned int mask;
BusChild *kid;
SCLPEventClass *child;
mask = 0;
QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
DeviceState *qdev = kid->child;
child = SCLP_EVENT_GET_CLASS((SCLPEvent *) qdev);
mask |= child->get_receive_mask();
}
return mask;
}
static uint16_t write_event_length_check(SCCB *sccb)
{
int slen;
unsigned elen = 0;
EventBufferHeader *event;
WriteEventData *wed = (WriteEventData *) sccb;
event = (EventBufferHeader *) &wed->ebh;
for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
elen = be16_to_cpu(event->length);
if (elen < sizeof(*event) || elen > slen) {
return SCLP_RC_EVENT_BUFFER_SYNTAX_ERROR;
}
event = (void *) event + elen;
}
if (slen) {
return SCLP_RC_INCONSISTENT_LENGTHS;
}
return SCLP_RC_NORMAL_COMPLETION;
}
static uint16_t handle_write_event_buf(SCLPEventFacility *ef,
EventBufferHeader *event_buf, SCCB *sccb)
{
uint16_t rc;
BusChild *kid;
SCLPEvent *event;
SCLPEventClass *ec;
rc = SCLP_RC_INVALID_FUNCTION;
QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
DeviceState *qdev = kid->child;
event = (SCLPEvent *) qdev;
ec = SCLP_EVENT_GET_CLASS(event);
if (ec->write_event_data &&
ec->event_type() == event_buf->type) {
rc = ec->write_event_data(event, event_buf);
break;
}
}
return rc;
}
static uint16_t handle_sccb_write_events(SCLPEventFacility *ef, SCCB *sccb)
{
uint16_t rc;
int slen;
unsigned elen = 0;
EventBufferHeader *event_buf;
WriteEventData *wed = (WriteEventData *) sccb;
event_buf = &wed->ebh;
rc = SCLP_RC_NORMAL_COMPLETION;
/* loop over all contained event buffers */
for (slen = sccb_data_len(sccb); slen > 0; slen -= elen) {
elen = be16_to_cpu(event_buf->length);
/* in case of a previous error mark all trailing buffers
* as not accepted */
if (rc != SCLP_RC_NORMAL_COMPLETION) {
event_buf->flags &= ~(SCLP_EVENT_BUFFER_ACCEPTED);
} else {
rc = handle_write_event_buf(ef, event_buf, sccb);
}
event_buf = (void *) event_buf + elen;
}
return rc;
}
static void write_event_data(SCLPEventFacility *ef, SCCB *sccb)
{
if (sccb->h.function_code != SCLP_FC_NORMAL_WRITE) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
goto out;
}
if (be16_to_cpu(sccb->h.length) < 8) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
goto out;
}
/* first do a sanity check of the write events */
sccb->h.response_code = cpu_to_be16(write_event_length_check(sccb));
/* if no early error, then execute */
if (sccb->h.response_code == be16_to_cpu(SCLP_RC_NORMAL_COMPLETION)) {
sccb->h.response_code =
cpu_to_be16(handle_sccb_write_events(ef, sccb));
}
out:
return;
}
static uint16_t handle_sccb_read_events(SCLPEventFacility *ef, SCCB *sccb,
unsigned int mask)
{
uint16_t rc;
int slen;
unsigned elen = 0;
BusChild *kid;
SCLPEvent *event;
SCLPEventClass *ec;
EventBufferHeader *event_buf;
ReadEventData *red = (ReadEventData *) sccb;
event_buf = &red->ebh;
event_buf->length = 0;
slen = sizeof(sccb->data);
rc = SCLP_RC_NO_EVENT_BUFFERS_STORED;
QTAILQ_FOREACH(kid, &ef->sbus.qbus.children, sibling) {
DeviceState *qdev = kid->child;
event = (SCLPEvent *) qdev;
ec = SCLP_EVENT_GET_CLASS(event);
if (mask & ec->get_send_mask()) {
if (ec->read_event_data(event, event_buf, &slen)) {
rc = SCLP_RC_NORMAL_COMPLETION;
}
}
elen = be16_to_cpu(event_buf->length);
event_buf = (void *) event_buf + elen;
}
if (sccb->h.control_mask[2] & SCLP_VARIABLE_LENGTH_RESPONSE) {
/* architecture suggests to reset variable-length-response bit */
sccb->h.control_mask[2] &= ~SCLP_VARIABLE_LENGTH_RESPONSE;
/* with a new length value */
sccb->h.length = cpu_to_be16(SCCB_SIZE - slen);
}
return rc;
}
static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
{
unsigned int sclp_active_selection_mask;
unsigned int sclp_cp_receive_mask;
ReadEventData *red = (ReadEventData *) sccb;
if (be16_to_cpu(sccb->h.length) != SCCB_SIZE) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
goto out;
}
sclp_cp_receive_mask = ef->receive_mask;
/* get active selection mask */
switch (sccb->h.function_code) {
case SCLP_UNCONDITIONAL_READ:
sclp_active_selection_mask = sclp_cp_receive_mask;
break;
case SCLP_SELECTIVE_READ:
if (!(sclp_cp_receive_mask & be32_to_cpu(red->mask))) {
sccb->h.response_code =
cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
goto out;
}
sclp_active_selection_mask = be32_to_cpu(red->mask);
break;
default:
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
goto out;
}
sccb->h.response_code = cpu_to_be16(
handle_sccb_read_events(ef, sccb, sclp_active_selection_mask));
out:
return;
}
static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
{
WriteEventMask *we_mask = (WriteEventMask *) sccb;
/* Attention: We assume that Linux uses 4-byte masks, what it actually
does. Architecture allows for masks of variable size, though */
if (be16_to_cpu(we_mask->mask_length) != 4) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
goto out;
}
/* keep track of the guest's capability masks */
ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);
/* return the SCLP's capability masks to the guest */
we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
out:
return;
}
/* qemu object creation and initialization functions */
#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
{
}
static const TypeInfo s390_sclp_events_bus_info = {
.name = TYPE_SCLP_EVENTS_BUS,
.parent = TYPE_BUS,
.class_init = sclp_events_bus_class_init,
};
static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code)
{
switch (code) {
case SCLP_CMD_READ_EVENT_DATA:
read_event_data(ef, sccb);
break;
case SCLP_CMD_WRITE_EVENT_DATA:
write_event_data(ef, sccb);
break;
case SCLP_CMD_WRITE_EVENT_MASK:
write_event_mask(ef, sccb);
break;
default:
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
break;
}
}
static int init_event_facility(S390SCLPDevice *sdev)
{
SCLPEventFacility *event_facility;
DeviceState *quiesce;
event_facility = g_malloc0(sizeof(SCLPEventFacility));
sdev->ef = event_facility;
sdev->sclp_command_handler = command_handler;
sdev->event_pending = event_pending;
/* Spawn a new sclp-events facility */
qbus_create_inplace(&event_facility->sbus.qbus,
TYPE_SCLP_EVENTS_BUS, (DeviceState *)sdev, NULL);
event_facility->sbus.qbus.allow_hotplug = 0;
event_facility->qdev = (DeviceState *) sdev;
quiesce = qdev_create(&event_facility->sbus.qbus, "sclpquiesce");
if (!quiesce) {
return -1;
}
qdev_init_nofail(quiesce);
return 0;
}
static void init_event_facility_class(ObjectClass *klass, void *data)
{
S390SCLPDeviceClass *k = SCLP_S390_DEVICE_CLASS(klass);
k->init = init_event_facility;
}
static const TypeInfo s390_sclp_event_facility_info = {
.name = "s390-sclp-event-facility",
.parent = TYPE_DEVICE_S390_SCLP,
.instance_size = sizeof(S390SCLPDevice),
.class_init = init_event_facility_class,
};
static int event_qdev_init(DeviceState *qdev)
{
SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
return child->init(event);
}
static int event_qdev_exit(DeviceState *qdev)
{
SCLPEvent *event = DO_UPCAST(SCLPEvent, qdev, qdev);
SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
if (child->exit) {
child->exit(event);
}
return 0;
}
static void event_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->bus_type = TYPE_SCLP_EVENTS_BUS;
dc->unplug = qdev_simple_unplug_cb;
dc->init = event_qdev_init;
dc->exit = event_qdev_exit;
}
static const TypeInfo s390_sclp_event_type_info = {
.name = TYPE_SCLP_EVENT,
.parent = TYPE_DEVICE,
.instance_size = sizeof(SCLPEvent),
.class_init = event_class_init,
.class_size = sizeof(SCLPEventClass),
.abstract = true,
};
static void register_types(void)
{
type_register_static(&s390_sclp_events_bus_info);
type_register_static(&s390_sclp_event_facility_info);
type_register_static(&s390_sclp_event_type_info);
}
type_init(register_types)