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 "qemu/osdep.h"
  16 #include "qapi/error.h"
  17 #include "cpu.h"
  18 #include "sysemu/sysemu.h"
  19 #include "hw/boards.h"
  20 #include "hw/s390x/sclp.h"
  21 #include "hw/s390x/event-facility.h"
  22 #include "hw/s390x/s390-pci-bus.h"
  23 #include "hw/s390x/ipl.h"
  24
  25 static inline SCLPDevice *get_sclp_device(void)
  26 {
  27     static SCLPDevice *sclp;
  28
  29     if (!sclp) {
  30         sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
  31     }
  32     return sclp;
  33 }
  34
  35 static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int *count)
  36 {
  37     MachineState *ms = MACHINE(qdev_get_machine());
  38     uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
  39     int i;
  40
  41     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
  42     for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
  43         if (!ms->possible_cpus->cpus[i].cpu) {
  44             continue;
  45         }
  46         entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
  47         entry[*count].type = 0;
  48         memcpy(entry[*count].features, features, sizeof(features));
  49         (*count)++;
  50     }
  51 }
  52
  53 /* Provide information about the configuration, CPUs and storage */
  54 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
  55 {
  56     ReadInfo *read_info = (ReadInfo *) sccb;
  57     MachineState *machine = MACHINE(qdev_get_machine());
  58     int cpu_count;
  59     int rnsize, rnmax;
  60     IplParameterBlock *ipib = s390_ipl_get_iplb();
  61
  62     /* CPU information */
  63     prepare_cpu_entries(sclp, read_info->entries, &cpu_count);
  64     read_info->entries_cpu = cpu_to_be16(cpu_count);
  65     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
  66     read_info->highest_cpu = cpu_to_be16(max_cpus - 1);
  67
  68     read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
  69
  70     /* Configuration Characteristic (Extension) */
  71     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
  72                          read_info->conf_char);
  73     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
  74                          read_info->conf_char_ext);
  75
  76     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
  77                                         SCLP_HAS_IOA_RECONFIG);
  78
  79     read_info->mha_pow = s390_get_mha_pow();
  80     read_info->hmfai = cpu_to_be32(s390_get_hmfai());
  81
  82     rnsize = 1 << (sclp->increment_size - 20);
  83     if (rnsize <= 128) {
  84         read_info->rnsize = rnsize;
  85     } else {
  86         read_info->rnsize = 0;
  87         read_info->rnsize2 = cpu_to_be32(rnsize);
  88     }
  89
  90     /* we don't support standby memory, maxram_size is never exposed */
  91     rnmax = machine->ram_size >> sclp->increment_size;
  92     if (rnmax < 0x10000) {
  93         read_info->rnmax = cpu_to_be16(rnmax);
  94     } else {
  95         read_info->rnmax = cpu_to_be16(0);
  96         read_info->rnmax2 = cpu_to_be64(rnmax);
  97     }
  98
  99     if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
 100         memcpy(&read_info->loadparm, &ipib->loadparm,
 101                sizeof(read_info->loadparm));
 102     } else {
 103         s390_ipl_set_loadparm(read_info->loadparm);
 104     }
 105
 106     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 107 }
 108
 109 /* Provide information about the CPU */
 110 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
 111 {
 112     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
 113     int cpu_count;
 114
 115     prepare_cpu_entries(sclp, cpu_info->entries, &cpu_count);
 116     cpu_info->nr_configured = cpu_to_be16(cpu_count);
 117     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
 118     cpu_info->nr_standby = cpu_to_be16(0);
 119
 120     /* The standby offset is 16-byte for each CPU */
 121     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
 122         + cpu_info->nr_configured*sizeof(CPUEntry));
 123
 124
 125     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 126 }
 127
 128 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
 129                                       bool configure)
 130 {
 131     int rc;
 132
 133     if (be16_to_cpu(sccb->h.length) < 16) {
 134         rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
 135         goto out_err;
 136     }
 137
 138     switch (((IoaCfgSccb *)sccb)->atype) {
 139     case SCLP_RECONFIG_PCI_ATYPE:
 140         if (s390_has_feat(S390_FEAT_ZPCI)) {
 141             if (configure) {
 142                 s390_pci_sclp_configure(sccb);
 143             } else {
 144                 s390_pci_sclp_deconfigure(sccb);
 145             }
 146             return;
 147         }
 148         /* fallthrough */
 149     default:
 150         rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
 151     }
 152
 153  out_err:
 154     sccb->h.response_code = cpu_to_be16(rc);
 155 }
 156
 157 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
 158 {
 159     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 160     SCLPEventFacility *ef = sclp->event_facility;
 161     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 162
 163     switch (code & SCLP_CMD_CODE_MASK) {
 164     case SCLP_CMDW_READ_SCP_INFO:
 165     case SCLP_CMDW_READ_SCP_INFO_FORCED:
 166         sclp_c->read_SCP_info(sclp, sccb);
 167         break;
 168     case SCLP_CMDW_READ_CPU_INFO:
 169         sclp_c->read_cpu_info(sclp, sccb);
 170         break;
 171     case SCLP_CMDW_CONFIGURE_IOA:
 172         sclp_configure_io_adapter(sclp, sccb, true);
 173         break;
 174     case SCLP_CMDW_DECONFIGURE_IOA:
 175         sclp_configure_io_adapter(sclp, sccb, false);
 176         break;
 177     default:
 178         efc->command_handler(ef, sccb, code);
 179         break;
 180     }
 181 }
 182
 183 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
 184 {
 185     SCLPDevice *sclp = get_sclp_device();
 186     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 187     int r = 0;
 188     SCCB work_sccb;
 189
 190     hwaddr sccb_len = sizeof(SCCB);
 191
 192     /* first some basic checks on program checks */
 193     if (env->psw.mask & PSW_MASK_PSTATE) {
 194         r = -PGM_PRIVILEGED;
 195         goto out;
 196     }
 197     if (cpu_physical_memory_is_io(sccb)) {
 198         r = -PGM_ADDRESSING;
 199         goto out;
 200     }
 201     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
 202         || (sccb & ~0x7ffffff8UL) != 0) {
 203         r = -PGM_SPECIFICATION;
 204         goto out;
 205     }
 206
 207     /*
 208      * we want to work on a private copy of the sccb, to prevent guests
 209      * from playing dirty tricks by modifying the memory content after
 210      * the host has checked the values
 211      */
 212     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
 213
 214     /* Valid sccb sizes */
 215     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
 216         be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
 217         r = -PGM_SPECIFICATION;
 218         goto out;
 219     }
 220
 221     sclp_c->execute(sclp, &work_sccb, code);
 222
 223     cpu_physical_memory_write(sccb, &work_sccb,
 224                               be16_to_cpu(work_sccb.h.length));
 225
 226     sclp_c->service_interrupt(sclp, sccb);
 227
 228 out:
 229     return r;
 230 }
 231
 232 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
 233 {
 234     SCLPEventFacility *ef = sclp->event_facility;
 235     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 236
 237     uint32_t param = sccb & ~3;
 238
 239     /* Indicate whether an event is still pending */
 240     param |= efc->event_pending(ef) ? 1 : 0;
 241
 242     if (!param) {
 243         /* No need to send an interrupt, there's nothing to be notified about */
 244         return;
 245     }
 246     s390_sclp_extint(param);
 247 }
 248
 249 void sclp_service_interrupt(uint32_t sccb)
 250 {
 251     SCLPDevice *sclp = get_sclp_device();
 252     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 253
 254     sclp_c->service_interrupt(sclp, sccb);
 255 }
 256
 257 /* qemu object creation and initialization functions */
 258
 259 void s390_sclp_init(void)
 260 {
 261     Object *new = object_new(TYPE_SCLP);
 262
 263     object_property_add_child(qdev_get_machine(), TYPE_SCLP, new,
 264                               NULL);
 265     object_unref(OBJECT(new));
 266     qdev_init_nofail(DEVICE(new));
 267 }
 268
 269 static void sclp_realize(DeviceState *dev, Error **errp)
 270 {
 271     MachineState *machine = MACHINE(qdev_get_machine());
 272     SCLPDevice *sclp = SCLP(dev);
 273     Error *err = NULL;
 274     uint64_t hw_limit;
 275     int ret;
 276
 277     object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
 278                              &err);
 279     if (err) {
 280         goto out;
 281     }
 282     /*
 283      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
 284      * as we can't find a fitting bus via the qom tree, we have to add the
 285      * event facility to the sysbus, so e.g. a sclp console can be created.
 286      */
 287     qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
 288
 289     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
 290     if (ret == -E2BIG) {
 291         error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
 292                    hw_limit >> 30);
 293     } else if (ret) {
 294         error_setg(&err, "setting the guest size failed");
 295     }
 296
 297 out:
 298     error_propagate(errp, err);
 299 }
 300
 301 static void sclp_memory_init(SCLPDevice *sclp)
 302 {
 303     MachineState *machine = MACHINE(qdev_get_machine());
 304     ram_addr_t initial_mem = machine->ram_size;
 305     int increment_size = 20;
 306
 307     /* The storage increment size is a multiple of 1M and is a power of 2.
 308      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
 309      * The variable 'increment_size' is an exponent of 2 that can be
 310      * used to calculate the size (in bytes) of an increment. */
 311     while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
 312         increment_size++;
 313     }
 314     sclp->increment_size = increment_size;
 315
 316     /* The core memory area needs to be aligned with the increment size.
 317      * In effect, this can cause the user-specified memory size to be rounded
 318      * down to align with the nearest increment boundary. */
 319     initial_mem = initial_mem >> increment_size << increment_size;
 320
 321     machine->ram_size = initial_mem;
 322     /* let's propagate the changed ram size into the global variable. */
 323     ram_size = initial_mem;
 324 }
 325
 326 static void sclp_init(Object *obj)
 327 {
 328     SCLPDevice *sclp = SCLP(obj);
 329     Object *new;
 330
 331     new = object_new(TYPE_SCLP_EVENT_FACILITY);
 332     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
 333     object_unref(new);
 334     sclp->event_facility = EVENT_FACILITY(new);
 335
 336     sclp_memory_init(sclp);
 337 }
 338
 339 static void sclp_class_init(ObjectClass *oc, void *data)
 340 {
 341     SCLPDeviceClass *sc = SCLP_CLASS(oc);
 342     DeviceClass *dc = DEVICE_CLASS(oc);
 343
 344     dc->desc = "SCLP (Service-Call Logical Processor)";
 345     dc->realize = sclp_realize;
 346     dc->hotpluggable = false;
 347     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 348     /*
 349      * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
 350      * which is a non-pluggable sysbus device
 351      */
 352     dc->user_creatable = false;
 353
 354     sc->read_SCP_info = read_SCP_info;
 355     sc->read_cpu_info = sclp_read_cpu_info;
 356     sc->execute = sclp_execute;
 357     sc->service_interrupt = service_interrupt;
 358 }
 359
 360 static TypeInfo sclp_info = {
 361     .name = TYPE_SCLP,
 362     .parent = TYPE_DEVICE,
 363     .instance_init = sclp_init,
 364     .instance_size = sizeof(SCLPDevice),
 365     .class_init = sclp_class_init,
 366     .class_size = sizeof(SCLPDeviceClass),
 367 };
 368
 369 static void register_types(void)
 370 {
 371     type_register_static(&sclp_info);
 372 }
 373 type_init(register_types);