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 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 unsigned int send_mask(void) 41 { 42 return SCLP_EVENT_MASK_CONFIG_MGT_DATA; 43 } 44 45 static unsigned int 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) 107