115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
/*
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* SCLP event type
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* Signal CPU - Trigger SCLP interrupt for system CPU configure or
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* de-configure
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*
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* Copyright IBM, Corp. 2013
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*
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* Authors:
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* Thang Pham <thang.pham@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at your
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* option) any later version. See the COPYING file in the top-level directory.
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*
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*/
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#include "sysemu/sysemu.h"
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#include "hw/s390x/sclp.h"
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#include "hw/s390x/event-facility.h"
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#include "cpu.h"
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#include "sysemu/cpus.h"
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#include "sysemu/kvm.h"
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typedef struct ConfigMgtData {
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EventBufferHeader ebh;
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uint8_t reserved;
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uint8_t event_qualifier;
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} QEMU_PACKED ConfigMgtData;
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static qemu_irq *irq_cpu_hotplug; /* Only used in this file */
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#define EVENT_QUAL_CPU_CHANGE 1
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void raise_irq_cpu_hotplug(void)
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{
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qemu_irq_raise(*irq_cpu_hotplug);
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}
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static unsigned int send_mask(void)
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{
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return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
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}
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static unsigned int receive_mask(void)
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{
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return 0;
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}
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static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
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int *slen)
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{
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ConfigMgtData *cdata = (ConfigMgtData *) evt_buf_hdr;
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if (*slen < sizeof(ConfigMgtData)) {
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return 0;
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}
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/* Event is no longer pending */
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if (!event->event_pending) {
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return 0;
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}
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event->event_pending = false;
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/* Event header data */
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cdata->ebh.length = cpu_to_be16(sizeof(ConfigMgtData));
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cdata->ebh.type = SCLP_EVENT_CONFIG_MGT_DATA;
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cdata->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
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/* Trigger a rescan of CPUs by setting event qualifier */
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cdata->event_qualifier = EVENT_QUAL_CPU_CHANGE;
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*slen -= sizeof(ConfigMgtData);
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return 1;
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}
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static void trigger_signal(void *opaque, int n, int level)
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{
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SCLPEvent *event = opaque;
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event->event_pending = true;
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/* Trigger SCLP read operation */
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sclp_service_interrupt(0);
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}
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static int irq_cpu_hotplug_init(SCLPEvent *event)
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{
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irq_cpu_hotplug = qemu_allocate_irqs(trigger_signal, event, 1);
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return 0;
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}
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static void cpu_class_init(ObjectClass *oc, void *data)
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{
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SCLPEventClass *k = SCLP_EVENT_CLASS(oc);
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DeviceClass *dc = DEVICE_CLASS(oc);
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k->init = irq_cpu_hotplug_init;
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k->get_send_mask = send_mask;
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k->get_receive_mask = receive_mask;
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k->read_event_data = read_event_data;
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k->write_event_data = NULL;
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set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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}
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static const TypeInfo sclp_cpu_info = {
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.name = "sclp-cpu-hotplug",
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.parent = TYPE_SCLP_EVENT,
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.instance_size = sizeof(SCLPEvent),
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.class_init = cpu_class_init,
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.class_size = sizeof(SCLPEventClass),
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};
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static void sclp_cpu_register_types(void)
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{
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type_register_static(&sclp_cpu_info);
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}
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type_init(sclp_cpu_register_types)
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