meson: convert hw/vfio
[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 "cpu.h"
21 #include "sysemu/cpus.h"
22
23 typedef 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
31 void 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
41 static sccb_mask_t send_mask(void)
42 {
43 return SCLP_EVENT_MASK_CONFIG_MGT_DATA;
44 }
45
46 static sccb_mask_t receive_mask(void)
47 {
48 return 0;
49 }
50
51 static 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
77 static 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 * Reason: raise_irq_cpu_hotplug() depends on an unique
88 * TYPE_SCLP_CPU_HOTPLUG device, which is already created
89 * by the sclp event facility
90 */
91 dc->user_creatable = false;
92 }
93
94 static const TypeInfo sclp_cpu_info = {
95 .name = TYPE_SCLP_CPU_HOTPLUG,
96 .parent = TYPE_SCLP_EVENT,
97 .instance_size = sizeof(SCLPEvent),
98 .class_init = cpu_class_init,
99 .class_size = sizeof(SCLPEventClass),
100 };
101
102 static void sclp_cpu_register_types(void)
103 {
104 type_register_static(&sclp_cpu_info);
105 }
106
107 type_init(sclp_cpu_register_types)