LXR qemu/hw/s390x/sclpcpu.c

   1/*
   2 * SCLP event type
   3 *    Signal CPU - Trigger SCLP interrupt for system CPU configure or
   4 *    de-configure
   5 *
   6 * Copyright IBM, Corp. 2013
   7 *
   8 * Authors:
   9 *  Thang Pham <thang.pham@us.ibm.com>
  10 *
  11 * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  12 * option) any later version.  See the COPYING file in the top-level directory.
  13 *
  14 */
  15#include "qemu/osdep.h"
  16#include "sysemu/sysemu.h"
  17#include "hw/s390x/sclp.h"
  18#include "hw/s390x/event-facility.h"
  19#include "cpu.h"
  20#include "sysemu/cpus.h"
  21#include "sysemu/kvm.h"
  22
  23typedef struct ConfigMgtData {
  24    EventBufferHeader ebh;
  25    uint8_t reserved;
  26    uint8_t event_qualifier;
  27} QEMU_PACKED ConfigMgtData;
  28
  29#define EVENT_QUAL_CPU_CHANGE  1
  30
  31void raise_irq_cpu_hotplug(void)
  32{
  33    Object *obj = object_resolve_path_type("", TYPE_SCLP_CPU_HOTPLUG, NULL);
  34
  35    SCLP_EVENT(obj)->event_pending = true;
  36
  37    /* Trigger SCLP read operation */
  38    sclp_service_interrupt(0);
  39}
  40
  41static unsigned int send_mask(void)
  42{
  43    return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
  44}
  45
  46static unsigned int receive_mask(void)
  47{
  48    return 0;
  49}
  50
  51static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
  52                           int *slen)
  53{
  54    ConfigMgtData *cdata = (ConfigMgtData *) evt_buf_hdr;
  55    if (*slen < sizeof(ConfigMgtData)) {
  56        return 0;
  57    }
  58
  59    /* Event is no longer pending */
  60    if (!event->event_pending) {
  61        return 0;
  62    }
  63    event->event_pending = false;
  64
  65    /* Event header data */
  66    cdata->ebh.length = cpu_to_be16(sizeof(ConfigMgtData));
  67    cdata->ebh.type = SCLP_EVENT_CONFIG_MGT_DATA;
  68    cdata->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
  69
  70    /* Trigger a rescan of CPUs by setting event qualifier */
  71    cdata->event_qualifier = EVENT_QUAL_CPU_CHANGE;
  72    *slen -= sizeof(ConfigMgtData);
  73
  74    return 1;
  75}
  76
  77static void cpu_class_init(ObjectClass *oc, void *data)
  78{
  79    SCLPEventClass *k = SCLP_EVENT_CLASS(oc);
  80    DeviceClass *dc = DEVICE_CLASS(oc);
  81
  82    k->get_send_mask = send_mask;
  83    k->get_receive_mask = receive_mask;
  84    k->read_event_data = read_event_data;
  85    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
  86}
  87
  88static const TypeInfo sclp_cpu_info = {
  89    .name          = TYPE_SCLP_CPU_HOTPLUG,
  90    .parent        = TYPE_SCLP_EVENT,
  91    .instance_size = sizeof(SCLPEvent),
  92    .class_init    = cpu_class_init,
  93    .class_size    = sizeof(SCLPEventClass),
  94};
  95
  96static void sclp_cpu_register_types(void)
  97{
  98    type_register_static(&sclp_cpu_info);
  99}
 100
 101type_init(sclp_cpu_register_types)
 102