hw/s390x/sclp.c

   1 /*
   2  * SCLP Support
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Christian Borntraeger <borntraeger@de.ibm.com>
   8  *  Heinz Graalfs <graalfs@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  11  * option) any later version.  See the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include "cpu.h"
  16 #include "sysemu/kvm.h"
  17 #include "exec/memory.h"
  18 #include "sysemu/sysemu.h"
  19
  20 #include "hw/s390x/sclp.h"
  21
  22 static inline S390SCLPDevice *get_event_facility(void)
  23 {
  24     ObjectProperty *op = object_property_find(qdev_get_machine(),
  25                                               "s390-sclp-event-facility",
  26                                               NULL);
  27     assert(op);
  28     return op->opaque;
  29 }
  30
  31 /* Provide information about the configuration, CPUs and storage */
  32 static void read_SCP_info(SCCB *sccb)
  33 {
  34     ReadInfo *read_info = (ReadInfo *) sccb;
  35     CPUState *cpu;
  36     int shift = 0;
  37     int cpu_count = 0;
  38     int i = 0;
  39
  40     CPU_FOREACH(cpu) {
  41         cpu_count++;
  42     }
  43
  44     /* CPU information */
  45     read_info->entries_cpu = cpu_to_be16(cpu_count);
  46     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
  47     read_info->highest_cpu = cpu_to_be16(max_cpus);
  48
  49     for (i = 0; i < cpu_count; i++) {
  50         read_info->entries[i].address = i;
  51         read_info->entries[i].type = 0;
  52     }
  53
  54     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO);
  55
  56     while ((ram_size >> (20 + shift)) > 65535) {
  57         shift++;
  58     }
  59     read_info->rnmax = cpu_to_be16(ram_size >> (20 + shift));
  60     read_info->rnsize = 1 << shift;
  61     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
  62 }
  63
  64 /* Provide information about the CPU */
  65 static void sclp_read_cpu_info(SCCB *sccb)
  66 {
  67     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
  68     CPUState *cpu;
  69     int cpu_count = 0;
  70     int i = 0;
  71
  72     CPU_FOREACH(cpu) {
  73         cpu_count++;
  74     }
  75
  76     cpu_info->nr_configured = cpu_to_be16(cpu_count);
  77     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
  78     cpu_info->nr_standby = cpu_to_be16(0);
  79
  80     /* The standby offset is 16-byte for each CPU */
  81     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
  82         + cpu_info->nr_configured*sizeof(CPUEntry));
  83
  84     for (i = 0; i < cpu_count; i++) {
  85         cpu_info->entries[i].address = i;
  86         cpu_info->entries[i].type = 0;
  87     }
  88
  89     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
  90 }
  91
  92 static void sclp_execute(SCCB *sccb, uint64_t code)
  93 {
  94     S390SCLPDevice *sdev = get_event_facility();
  95
  96     switch (code & SCLP_CMD_CODE_MASK) {
  97     case SCLP_CMDW_READ_SCP_INFO:
  98     case SCLP_CMDW_READ_SCP_INFO_FORCED:
  99         read_SCP_info(sccb);
 100         break;
 101     case SCLP_CMDW_READ_CPU_INFO:
 102         sclp_read_cpu_info(sccb);
 103         break;
 104     default:
 105         sdev->sclp_command_handler(sdev->ef, sccb, code);
 106         break;
 107     }
 108 }
 109
 110 int sclp_service_call(uint32_t sccb, uint64_t code)
 111 {
 112     int r = 0;
 113     SCCB work_sccb;
 114
 115     hwaddr sccb_len = sizeof(SCCB);
 116
 117     /* first some basic checks on program checks */
 118     if (cpu_physical_memory_is_io(sccb)) {
 119         r = -PGM_ADDRESSING;
 120         goto out;
 121     }
 122     if (sccb & ~0x7ffffff8ul) {
 123         r = -PGM_SPECIFICATION;
 124         goto out;
 125     }
 126
 127     /*
 128      * we want to work on a private copy of the sccb, to prevent guests
 129      * from playing dirty tricks by modifying the memory content after
 130      * the host has checked the values
 131      */
 132     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
 133
 134     /* Valid sccb sizes */
 135     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
 136         be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
 137         r = -PGM_SPECIFICATION;
 138         goto out;
 139     }
 140
 141     sclp_execute((SCCB *)&work_sccb, code);
 142
 143     cpu_physical_memory_write(sccb, &work_sccb,
 144                               be16_to_cpu(work_sccb.h.length));
 145
 146     sclp_service_interrupt(sccb);
 147
 148 out:
 149     return r;
 150 }
 151
 152 void sclp_service_interrupt(uint32_t sccb)
 153 {
 154     S390SCLPDevice *sdev = get_event_facility();
 155     uint32_t param = sccb & ~3;
 156
 157     /* Indicate whether an event is still pending */
 158     param |= sdev->event_pending(sdev->ef) ? 1 : 0;
 159
 160     if (!param) {
 161         /* No need to send an interrupt, there's nothing to be notified about */
 162         return;
 163     }
 164     s390_sclp_extint(param);
 165 }
 166
 167 /* qemu object creation and initialization functions */
 168
 169 void s390_sclp_init(void)
 170 {
 171     DeviceState *dev  = qdev_create(NULL, "s390-sclp-event-facility");
 172
 173     object_property_add_child(qdev_get_machine(), "s390-sclp-event-facility",
 174                               OBJECT(dev), NULL);
 175     qdev_init_nofail(dev);
 176 }
 177
 178 static int s390_sclp_dev_init(SysBusDevice *dev)
 179 {
 180     int r;
 181     S390SCLPDevice *sdev = (S390SCLPDevice *)dev;
 182     S390SCLPDeviceClass *sclp = SCLP_S390_DEVICE_GET_CLASS(dev);
 183
 184     r = sclp->init(sdev);
 185     if (!r) {
 186         assert(sdev->event_pending);
 187         assert(sdev->sclp_command_handler);
 188     }
 189
 190     return r;
 191 }
 192
 193 static void s390_sclp_device_class_init(ObjectClass *klass, void *data)
 194 {
 195     SysBusDeviceClass *dc = SYS_BUS_DEVICE_CLASS(klass);
 196
 197     dc->init = s390_sclp_dev_init;
 198 }
 199
 200 static const TypeInfo s390_sclp_device_info = {
 201     .name = TYPE_DEVICE_S390_SCLP,
 202     .parent = TYPE_SYS_BUS_DEVICE,
 203     .instance_size = sizeof(S390SCLPDevice),
 204     .class_init = s390_sclp_device_class_init,
 205     .class_size = sizeof(S390SCLPDeviceClass),
 206     .abstract = true,
 207 };
 208
 209 static void s390_sclp_register_types(void)
 210 {
 211     type_register_static(&s390_sclp_device_info);
 212 }
 213
 214 type_init(s390_sclp_register_types)