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/*
* SCLP event type
* Signal CPU - Trigger SCLP interrupt for system CPU configure or
* de-configure
*
* Copyright IBM, Corp. 2013
*
* Authors:
* Thang Pham <thang.pham@us.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 "hw/s390x/sclp.h"
#include "qemu/module.h"
#include "hw/s390x/event-facility.h"
#include "sysemu/cpus.h"
typedef struct ConfigMgtData {
EventBufferHeader ebh;
uint8_t reserved;
uint8_t event_qualifier;
} QEMU_PACKED ConfigMgtData;
#define EVENT_QUAL_CPU_CHANGE 1
void raise_irq_cpu_hotplug(void)
{
Object *obj = object_resolve_path_type("", TYPE_SCLP_CPU_HOTPLUG, NULL);
SCLP_EVENT(obj)->event_pending = true;
/* Trigger SCLP read operation */
sclp_service_interrupt(0);
}
static sccb_mask_t send_mask(void)
{
return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
}
static sccb_mask_t receive_mask(void)
{
return 0;
}
static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
int *slen)
{
ConfigMgtData *cdata = (ConfigMgtData *) evt_buf_hdr;
if (*slen < sizeof(ConfigMgtData)) {
return 0;
}
/* Event is no longer pending */
if (!event->event_pending) {
return 0;
}
event->event_pending = false;
/* Event header data */
cdata->ebh.length = cpu_to_be16(sizeof(ConfigMgtData));
cdata->ebh.type = SCLP_EVENT_CONFIG_MGT_DATA;
cdata->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
/* Trigger a rescan of CPUs by setting event qualifier */
cdata->event_qualifier = EVENT_QUAL_CPU_CHANGE;
*slen -= sizeof(ConfigMgtData);
return 1;
}
static void sclp_cpu_class_init(ObjectClass *oc, void *data)
{
SCLPEventClass *k = SCLP_EVENT_CLASS(oc);
DeviceClass *dc = DEVICE_CLASS(oc);
k->get_send_mask = send_mask;
k->get_receive_mask = receive_mask;
k->read_event_data = read_event_data;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
/*
* Reason: raise_irq_cpu_hotplug() depends on an unique
* TYPE_SCLP_CPU_HOTPLUG device, which is already created
* by the sclp event facility
*/
dc->user_creatable = false;
}
static const TypeInfo sclp_cpu_info = {
.name = TYPE_SCLP_CPU_HOTPLUG,
.parent = TYPE_SCLP_EVENT,
.instance_size = sizeof(SCLPEvent),
.class_init = sclp_cpu_class_init,
.class_size = sizeof(SCLPEventClass),
};
static void sclp_cpu_register_types(void)
{
type_register_static(&sclp_cpu_info);
}
type_init(sclp_cpu_register_types)
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