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) |
108 | |