Merge tag 'pull-testing-gdbstub-plugins-gitdm-061022-3' of https://github.com/stsquad...
[qemu.git] / 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
22 typedef 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
30 void 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
40 static sccb_mask_t send_mask(void)
41 {
42 return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
43 }
44
45 static sccb_mask_t receive_mask(void)
46 {
47 return 0;
48 }
49
50 static 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
76 static 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
93 static 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
101 static void sclp_cpu_register_types(void)
102 {
103 type_register_static(&sclp_cpu_info);
104 }
105
106 type_init(sclp_cpu_register_types)