The consoles ("sclpconsole" and "sclplmconsole") can only be configured with "-device" and "-chardev" so far. Other machines use the convenience option "-serial" to configure the default consoles, even for virtual consoles like spapr-vty on the pseries machine. So let's support this option on s390x, too. This way we can easily enable the serial console here again with "-nodefaults", for example: qemu-system-s390x -no-shutdown -nographic -nodefaults -serial mon:stdio ... which is way shorter than typing: qemu-system-s390x -no-shutdown -nographic -nodefaults \ -chardev stdio,id=c1,mux=on -device sclpconsole,chardev=c1 \ -mon chardev=c1 The -serial parameter can also be used if you only want to see the QEMU monitor on stdio without using -nodefaults, but not the console output. That's something that is pretty impossible with the current code today: qemu-system-s390x -no-shutdown -nographic -serial none While we're at it, this patch also maps the second -serial option to the "sclplmconsole", so that there is now an easy way to configure this second console on s390x, too, for example: qemu-system-s390x -no-shutdown -nographic -serial null -serial mon:stdio Additionally, the new code is also smaller than the old one and we have less s390x-specific code in vl.c :-) I've also checked that migration still works as expected by migrating a guest with console output back and forth between a qemu-system-s390x that has this patch and an instance without this patch. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <1524754794-28005-1-git-send-email-thuth@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
560 lines
16 KiB
C
560 lines
16 KiB
C
/*
|
|
* 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 "qemu/osdep.h"
|
|
#include "qapi/error.h"
|
|
#include "sysemu/sysemu.h"
|
|
|
|
#include "hw/s390x/sclp.h"
|
|
#include "hw/s390x/event-facility.h"
|
|
|
|
typedef struct SCLPEventsBus {
|
|
BusState qbus;
|
|
} SCLPEventsBus;
|
|
|
|
/* we need to save 32 bit chunks for compatibility */
|
|
#ifdef HOST_WORDS_BIGENDIAN
|
|
#define RECV_MASK_LOWER 1
|
|
#define RECV_MASK_UPPER 0
|
|
#else /* little endian host */
|
|
#define RECV_MASK_LOWER 0
|
|
#define RECV_MASK_UPPER 1
|
|
#endif
|
|
|
|
struct SCLPEventFacility {
|
|
SysBusDevice parent_obj;
|
|
SCLPEventsBus sbus;
|
|
/* guest's receive mask */
|
|
union {
|
|
uint32_t receive_mask_pieces[2];
|
|
sccb_mask_t receive_mask;
|
|
};
|
|
/*
|
|
* when false, we keep the same broken, backwards compatible behaviour as
|
|
* before, allowing only masks of size exactly 4; when true, we implement
|
|
* the architecture correctly, allowing all valid mask sizes. Needed for
|
|
* migration toward older versions.
|
|
*/
|
|
bool allow_all_mask_sizes;
|
|
/* length of the receive mask */
|
|
uint16_t mask_length;
|
|
};
|
|
|
|
/* 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 sccb_mask_t get_host_send_mask(SCLPEventFacility *ef)
|
|
{
|
|
sccb_mask_t 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 sccb_mask_t get_host_receive_mask(SCLPEventFacility *ef)
|
|
{
|
|
sccb_mask_t 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->can_handle_event(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,
|
|
sccb_mask_t mask)
|
|
{
|
|
uint16_t rc;
|
|
int slen;
|
|
unsigned elen;
|
|
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)) {
|
|
elen = be16_to_cpu(event_buf->length);
|
|
event_buf = (EventBufferHeader *) ((char *)event_buf + elen);
|
|
rc = SCLP_RC_NORMAL_COMPLETION;
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* copy up to src_len bytes and fill the rest of dst with zeroes */
|
|
static void copy_mask(uint8_t *dst, uint8_t *src, uint16_t dst_len,
|
|
uint16_t src_len)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < dst_len; i++) {
|
|
dst[i] = i < src_len ? src[i] : 0;
|
|
}
|
|
}
|
|
|
|
static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
|
|
{
|
|
sccb_mask_t sclp_active_selection_mask;
|
|
sccb_mask_t 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:
|
|
copy_mask((uint8_t *)&sclp_active_selection_mask, (uint8_t *)&red->mask,
|
|
sizeof(sclp_active_selection_mask), ef->mask_length);
|
|
sclp_active_selection_mask = be64_to_cpu(sclp_active_selection_mask);
|
|
if (!sclp_cp_receive_mask ||
|
|
(sclp_active_selection_mask & ~sclp_cp_receive_mask)) {
|
|
sccb->h.response_code =
|
|
cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
|
|
goto out;
|
|
}
|
|
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;
|
|
uint16_t mask_length = be16_to_cpu(we_mask->mask_length);
|
|
sccb_mask_t tmp_mask;
|
|
|
|
if (!mask_length || (mask_length > SCLP_EVENT_MASK_LEN_MAX) ||
|
|
((mask_length != 4) && !ef->allow_all_mask_sizes)) {
|
|
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Note: We currently only support masks up to 8 byte length;
|
|
* the remainder is filled up with zeroes. Older Linux
|
|
* kernels use a 4 byte mask length, newer ones can use both
|
|
* 8 or 4 depending on what is available on the host.
|
|
*/
|
|
|
|
/* keep track of the guest's capability masks */
|
|
copy_mask((uint8_t *)&tmp_mask, WEM_CP_RECEIVE_MASK(we_mask, mask_length),
|
|
sizeof(tmp_mask), mask_length);
|
|
ef->receive_mask = be64_to_cpu(tmp_mask);
|
|
|
|
/* return the SCLP's capability masks to the guest */
|
|
tmp_mask = cpu_to_be64(get_host_receive_mask(ef));
|
|
copy_mask(WEM_RECEIVE_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
|
|
mask_length, sizeof(tmp_mask));
|
|
tmp_mask = cpu_to_be64(get_host_send_mask(ef));
|
|
copy_mask(WEM_SEND_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
|
|
mask_length, sizeof(tmp_mask));
|
|
|
|
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
|
|
ef->mask_length = mask_length;
|
|
|
|
out:
|
|
return;
|
|
}
|
|
|
|
/* qemu object creation and initialization functions */
|
|
|
|
#define TYPE_SCLP_EVENTS_BUS "s390-sclp-events-bus"
|
|
|
|
static void sclp_events_bus_realize(BusState *bus, Error **errp)
|
|
{
|
|
BusChild *kid;
|
|
|
|
/* TODO: recursive realization has to be done in common code */
|
|
QTAILQ_FOREACH(kid, &bus->children, sibling) {
|
|
DeviceState *dev = kid->child;
|
|
|
|
object_property_set_bool(OBJECT(dev), true, "realized", errp);
|
|
if (*errp) {
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void sclp_events_bus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
BusClass *bc = BUS_CLASS(klass);
|
|
|
|
bc->realize = sclp_events_bus_realize;
|
|
}
|
|
|
|
static const TypeInfo 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 & SCLP_CMD_CODE_MASK) {
|
|
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 bool vmstate_event_facility_mask64_needed(void *opaque)
|
|
{
|
|
SCLPEventFacility *ef = opaque;
|
|
|
|
return (ef->receive_mask & 0xFFFFFFFF) != 0;
|
|
}
|
|
|
|
static bool vmstate_event_facility_mask_length_needed(void *opaque)
|
|
{
|
|
SCLPEventFacility *ef = opaque;
|
|
|
|
return ef->allow_all_mask_sizes;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_event_facility_mask64 = {
|
|
.name = "vmstate-event-facility/mask64",
|
|
.version_id = 0,
|
|
.minimum_version_id = 0,
|
|
.needed = vmstate_event_facility_mask64_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(receive_mask_pieces[RECV_MASK_LOWER], SCLPEventFacility),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_event_facility_mask_length = {
|
|
.name = "vmstate-event-facility/mask_length",
|
|
.version_id = 0,
|
|
.minimum_version_id = 0,
|
|
.needed = vmstate_event_facility_mask_length_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT16(mask_length, SCLPEventFacility),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_event_facility = {
|
|
.name = "vmstate-event-facility",
|
|
.version_id = 0,
|
|
.minimum_version_id = 0,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(receive_mask_pieces[RECV_MASK_UPPER], SCLPEventFacility),
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
.subsections = (const VMStateDescription * []) {
|
|
&vmstate_event_facility_mask64,
|
|
&vmstate_event_facility_mask_length,
|
|
NULL
|
|
}
|
|
};
|
|
|
|
static void sclp_event_set_allow_all_mask_sizes(Object *obj, bool value,
|
|
Error **errp)
|
|
{
|
|
SCLPEventFacility *ef = (SCLPEventFacility *)obj;
|
|
|
|
ef->allow_all_mask_sizes = value;
|
|
}
|
|
|
|
static bool sclp_event_get_allow_all_mask_sizes(Object *obj, Error **e)
|
|
{
|
|
SCLPEventFacility *ef = (SCLPEventFacility *)obj;
|
|
|
|
return ef->allow_all_mask_sizes;
|
|
}
|
|
|
|
static void init_event_facility(Object *obj)
|
|
{
|
|
SCLPEventFacility *event_facility = EVENT_FACILITY(obj);
|
|
DeviceState *sdev = DEVICE(obj);
|
|
Object *new;
|
|
|
|
event_facility->mask_length = 4;
|
|
event_facility->allow_all_mask_sizes = true;
|
|
object_property_add_bool(obj, "allow_all_mask_sizes",
|
|
sclp_event_get_allow_all_mask_sizes,
|
|
sclp_event_set_allow_all_mask_sizes, NULL);
|
|
/* Spawn a new bus for SCLP events */
|
|
qbus_create_inplace(&event_facility->sbus, sizeof(event_facility->sbus),
|
|
TYPE_SCLP_EVENTS_BUS, sdev, NULL);
|
|
|
|
new = object_new(TYPE_SCLP_QUIESCE);
|
|
object_property_add_child(obj, TYPE_SCLP_QUIESCE, new, NULL);
|
|
object_unref(new);
|
|
qdev_set_parent_bus(DEVICE(new), &event_facility->sbus.qbus);
|
|
|
|
new = object_new(TYPE_SCLP_CPU_HOTPLUG);
|
|
object_property_add_child(obj, TYPE_SCLP_CPU_HOTPLUG, new, NULL);
|
|
object_unref(new);
|
|
qdev_set_parent_bus(DEVICE(new), &event_facility->sbus.qbus);
|
|
/* the facility will automatically realize the devices via the bus */
|
|
}
|
|
|
|
static void reset_event_facility(DeviceState *dev)
|
|
{
|
|
SCLPEventFacility *sdev = EVENT_FACILITY(dev);
|
|
|
|
sdev->receive_mask = 0;
|
|
}
|
|
|
|
static void init_event_facility_class(ObjectClass *klass, void *data)
|
|
{
|
|
SysBusDeviceClass *sbdc = SYS_BUS_DEVICE_CLASS(klass);
|
|
DeviceClass *dc = DEVICE_CLASS(sbdc);
|
|
SCLPEventFacilityClass *k = EVENT_FACILITY_CLASS(dc);
|
|
|
|
dc->reset = reset_event_facility;
|
|
dc->vmsd = &vmstate_event_facility;
|
|
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
|
|
k->command_handler = command_handler;
|
|
k->event_pending = event_pending;
|
|
}
|
|
|
|
static const TypeInfo sclp_event_facility_info = {
|
|
.name = TYPE_SCLP_EVENT_FACILITY,
|
|
.parent = TYPE_SYS_BUS_DEVICE,
|
|
.instance_init = init_event_facility,
|
|
.instance_size = sizeof(SCLPEventFacility),
|
|
.class_init = init_event_facility_class,
|
|
.class_size = sizeof(SCLPEventFacilityClass),
|
|
};
|
|
|
|
static void event_realize(DeviceState *qdev, Error **errp)
|
|
{
|
|
SCLPEvent *event = SCLP_EVENT(qdev);
|
|
SCLPEventClass *child = SCLP_EVENT_GET_CLASS(event);
|
|
|
|
if (child->init) {
|
|
int rc = child->init(event);
|
|
if (rc < 0) {
|
|
error_setg(errp, "SCLP event initialization failed.");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void event_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->bus_type = TYPE_SCLP_EVENTS_BUS;
|
|
dc->realize = event_realize;
|
|
}
|
|
|
|
static const TypeInfo 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(&sclp_events_bus_info);
|
|
type_register_static(&sclp_event_facility_info);
|
|
type_register_static(&sclp_event_type_info);
|
|
}
|
|
|
|
type_init(register_types)
|
|
|
|
BusState *sclp_get_event_facility_bus(void)
|
|
{
|
|
Object *busobj;
|
|
SCLPEventsBus *sbus;
|
|
|
|
busobj = object_resolve_path_type("", TYPE_SCLP_EVENTS_BUS, NULL);
|
|
sbus = OBJECT_CHECK(SCLPEventsBus, busobj, TYPE_SCLP_EVENTS_BUS);
|
|
if (!sbus) {
|
|
return NULL;
|
|
}
|
|
|
|
return &sbus->qbus;
|
|
}
|