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