qemu

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/*
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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 "qemu/osdep.h"
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#include "hw/s390x/sclp.h"
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#include "qemu/module.h"
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#include "hw/s390x/event-facility.h"
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#include "sysemu/cpus.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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#define EVENT_QUAL_CPU_CHANGE  1
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void raise_irq_cpu_hotplug(void)
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{
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    Object *obj = object_resolve_path_type("", TYPE_SCLP_CPU_HOTPLUG, NULL);
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    SCLP_EVENT(obj)->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 sccb_mask_t 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 sccb_mask_t 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 sclp_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->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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    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
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    /*
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     * Reason: raise_irq_cpu_hotplug() depends on an unique
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     * TYPE_SCLP_CPU_HOTPLUG device, which is already created
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     * by the sclp event facility
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     */
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    dc->user_creatable = false;
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}
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static const TypeInfo sclp_cpu_info = {
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    .name          = TYPE_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    = sclp_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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