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
  16#include "qemu/osdep.h"
  17#include "sysemu/sysemu.h"
  18#include "hw/s390x/sclp.h"
  19#include "qemu/module.h"
  20#include "hw/s390x/event-facility.h"
  21#include "cpu.h"
  22#include "sysemu/cpus.h"
  23
  24typedef struct ConfigMgtData {
  25    EventBufferHeader ebh;
  26    uint8_t reserved;
  27    uint8_t event_qualifier;
  28} QEMU_PACKED ConfigMgtData;
  29
  30#define EVENT_QUAL_CPU_CHANGE  1
  31
  32void raise_irq_cpu_hotplug(void)
  33{
  34    Object *obj = object_resolve_path_type("", TYPE_SCLP_CPU_HOTPLUG, NULL);
  35
  36    SCLP_EVENT(obj)->event_pending = true;
  37
  38    /* Trigger SCLP read operation */
  39    sclp_service_interrupt(0);
  40}
  41
  42static sccb_mask_t send_mask(void)
  43{
  44    return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
  45}
  46
  47static sccb_mask_t receive_mask(void)
  48{
  49    return 0;
  50}
  51
  52static int read_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr,
  53                           int *slen)
  54{
  55    ConfigMgtData *cdata = (ConfigMgtData *) evt_buf_hdr;
  56    if (*slen < sizeof(ConfigMgtData)) {
  57        return 0;
  58    }
  59
  60    /* Event is no longer pending */
  61    if (!event->event_pending) {
  62        return 0;
  63    }
  64    event->event_pending = false;
  65
  66    /* Event header data */
  67    cdata->ebh.length = cpu_to_be16(sizeof(ConfigMgtData));
  68    cdata->ebh.type = SCLP_EVENT_CONFIG_MGT_DATA;
  69    cdata->ebh.flags |= SCLP_EVENT_BUFFER_ACCEPTED;
  70
  71    /* Trigger a rescan of CPUs by setting event qualifier */
  72    cdata->event_qualifier = EVENT_QUAL_CPU_CHANGE;
  73    *slen -= sizeof(ConfigMgtData);
  74
  75    return 1;
  76}
  77
  78static void cpu_class_init(ObjectClass *oc, void *data)
  79{
  80    SCLPEventClass *k = SCLP_EVENT_CLASS(oc);
  81    DeviceClass *dc = DEVICE_CLASS(oc);
  82
  83    k->get_send_mask = send_mask;
  84    k->get_receive_mask = receive_mask;
  85    k->read_event_data = read_event_data;
  86    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
  87    /*
  88     * Reason: raise_irq_cpu_hotplug() depends on an unique
  89     * TYPE_SCLP_CPU_HOTPLUG device, which is already created
  90     * by the sclp event facility
  91     */
  92    dc->user_creatable = false;
  93}
  94
  95static const TypeInfo sclp_cpu_info = {
  96    .name          = TYPE_SCLP_CPU_HOTPLUG,
  97    .parent        = TYPE_SCLP_EVENT,
  98    .instance_size = sizeof(SCLPEvent),
  99    .class_init    = cpu_class_init,
 100    .class_size    = sizeof(SCLPEventClass),
 101};
 102
 103static void sclp_cpu_register_types(void)
 104{
 105    type_register_static(&sclp_cpu_info);
 106}
 107
 108type_init(sclp_cpu_register_types)
 109