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 #include "qemu/osdep.h" 16 #include "sysemu/sysemu.h" 17 #include "hw/s390x/sclp.h" 18 #include "hw/s390x/event-facility.h" 19 #include "cpu.h" 20 #include "sysemu/cpus.h" 21 #include "sysemu/kvm.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 unsigned int send_mask(void) 42 { 43 return SCLP_EVENT_MASK_CONFIG_MGT_DATA; 44 } 45 46 static unsigned int 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 88 static const TypeInfo sclp_cpu_info = { 89 .name = TYPE_SCLP_CPU_HOTPLUG, 90 .parent = TYPE_SCLP_EVENT, 91 .instance_size = sizeof(SCLPEvent), 92 .class_init = cpu_class_init, 93 .class_size = sizeof(SCLPEventClass), 94 }; 95 96 static void sclp_cpu_register_types(void) 97 { 98 type_register_static(&sclp_cpu_info); 99 } 100 101 type_init(sclp_cpu_register_types) 102