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 "qemu/units.h"
  17 #include "qapi/error.h"
  18 #include "cpu.h"
  19 #include "sysemu/sysemu.h"
  20 #include "hw/boards.h"
  21 #include "hw/s390x/sclp.h"
  22 #include "hw/s390x/event-facility.h"
  23 #include "hw/s390x/s390-pci-bus.h"
  24 #include "hw/s390x/ipl.h"
  25
  26 static inline SCLPDevice *get_sclp_device(void)
  27 {
  28     static SCLPDevice *sclp;
  29
  30     if (!sclp) {
  31         sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
  32     }
  33     return sclp;
  34 }
  35
  36 static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int *count)
  37 {
  38     MachineState *ms = MACHINE(qdev_get_machine());
  39     uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
  40     int i;
  41
  42     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
  43     for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
  44         if (!ms->possible_cpus->cpus[i].cpu) {
  45             continue;
  46         }
  47         entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
  48         entry[*count].type = 0;
  49         memcpy(entry[*count].features, features, sizeof(features));
  50         (*count)++;
  51     }
  52 }
  53
  54 /* Provide information about the configuration, CPUs and storage */
  55 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
  56 {
  57     ReadInfo *read_info = (ReadInfo *) sccb;
  58     MachineState *machine = MACHINE(qdev_get_machine());
  59     int cpu_count;
  60     int rnsize, rnmax;
  61     IplParameterBlock *ipib = s390_ipl_get_iplb();
  62
  63     /* CPU information */
  64     prepare_cpu_entries(sclp, read_info->entries, &cpu_count);
  65     read_info->entries_cpu = cpu_to_be16(cpu_count);
  66     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
  67     read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
  68
  69     read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
  70
  71     if (be16_to_cpu(sccb->h.length) <
  72             (sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) {
  73         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
  74         return;
  75     }
  76
  77     /* Configuration Characteristic (Extension) */
  78     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
  79                          read_info->conf_char);
  80     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
  81                          read_info->conf_char_ext);
  82
  83     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
  84                                         SCLP_HAS_IOA_RECONFIG);
  85
  86     read_info->mha_pow = s390_get_mha_pow();
  87     read_info->hmfai = cpu_to_be32(s390_get_hmfai());
  88
  89     rnsize = 1 << (sclp->increment_size - 20);
  90     if (rnsize <= 128) {
  91         read_info->rnsize = rnsize;
  92     } else {
  93         read_info->rnsize = 0;
  94         read_info->rnsize2 = cpu_to_be32(rnsize);
  95     }
  96
  97     /* we don't support standby memory, maxram_size is never exposed */
  98     rnmax = machine->ram_size >> sclp->increment_size;
  99     if (rnmax < 0x10000) {
 100         read_info->rnmax = cpu_to_be16(rnmax);
 101     } else {
 102         read_info->rnmax = cpu_to_be16(0);
 103         read_info->rnmax2 = cpu_to_be64(rnmax);
 104     }
 105
 106     if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
 107         memcpy(&read_info->loadparm, &ipib->loadparm,
 108                sizeof(read_info->loadparm));
 109     } else {
 110         s390_ipl_set_loadparm(read_info->loadparm);
 111     }
 112
 113     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 114 }
 115
 116 /* Provide information about the CPU */
 117 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
 118 {
 119     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
 120     int cpu_count;
 121
 122     prepare_cpu_entries(sclp, cpu_info->entries, &cpu_count);
 123     cpu_info->nr_configured = cpu_to_be16(cpu_count);
 124     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
 125     cpu_info->nr_standby = cpu_to_be16(0);
 126
 127     if (be16_to_cpu(sccb->h.length) <
 128             (sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) {
 129         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
 130         return;
 131     }
 132
 133     /* The standby offset is 16-byte for each CPU */
 134     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
 135         + cpu_info->nr_configured*sizeof(CPUEntry));
 136
 137
 138     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 139 }
 140
 141 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
 142                                       bool configure)
 143 {
 144     int rc;
 145
 146     if (be16_to_cpu(sccb->h.length) < 16) {
 147         rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
 148         goto out_err;
 149     }
 150
 151     switch (((IoaCfgSccb *)sccb)->atype) {
 152     case SCLP_RECONFIG_PCI_ATYPE:
 153         if (s390_has_feat(S390_FEAT_ZPCI)) {
 154             if (configure) {
 155                 s390_pci_sclp_configure(sccb);
 156             } else {
 157                 s390_pci_sclp_deconfigure(sccb);
 158             }
 159             return;
 160         }
 161         /* fallthrough */
 162     default:
 163         rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
 164     }
 165
 166  out_err:
 167     sccb->h.response_code = cpu_to_be16(rc);
 168 }
 169
 170 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
 171 {
 172     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 173     SCLPEventFacility *ef = sclp->event_facility;
 174     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 175
 176     switch (code & SCLP_CMD_CODE_MASK) {
 177     case SCLP_CMDW_READ_SCP_INFO:
 178     case SCLP_CMDW_READ_SCP_INFO_FORCED:
 179         sclp_c->read_SCP_info(sclp, sccb);
 180         break;
 181     case SCLP_CMDW_READ_CPU_INFO:
 182         sclp_c->read_cpu_info(sclp, sccb);
 183         break;
 184     case SCLP_CMDW_CONFIGURE_IOA:
 185         sclp_configure_io_adapter(sclp, sccb, true);
 186         break;
 187     case SCLP_CMDW_DECONFIGURE_IOA:
 188         sclp_configure_io_adapter(sclp, sccb, false);
 189         break;
 190     default:
 191         efc->command_handler(ef, sccb, code);
 192         break;
 193     }
 194 }
 195
 196 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
 197 {
 198     SCLPDevice *sclp = get_sclp_device();
 199     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 200     int r = 0;
 201     SCCB work_sccb;
 202
 203     hwaddr sccb_len = sizeof(SCCB);
 204
 205     /* first some basic checks on program checks */
 206     if (env->psw.mask & PSW_MASK_PSTATE) {
 207         r = -PGM_PRIVILEGED;
 208         goto out;
 209     }
 210     if (cpu_physical_memory_is_io(sccb)) {
 211         r = -PGM_ADDRESSING;
 212         goto out;
 213     }
 214     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
 215         || (sccb & ~0x7ffffff8UL) != 0) {
 216         r = -PGM_SPECIFICATION;
 217         goto out;
 218     }
 219
 220     /*
 221      * we want to work on a private copy of the sccb, to prevent guests
 222      * from playing dirty tricks by modifying the memory content after
 223      * the host has checked the values
 224      */
 225     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
 226
 227     /* Valid sccb sizes */
 228     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader)) {
 229         r = -PGM_SPECIFICATION;
 230         goto out;
 231     }
 232
 233     switch (code & SCLP_CMD_CODE_MASK) {
 234     case SCLP_CMDW_READ_SCP_INFO:
 235     case SCLP_CMDW_READ_SCP_INFO_FORCED:
 236     case SCLP_CMDW_READ_CPU_INFO:
 237     case SCLP_CMDW_CONFIGURE_IOA:
 238     case SCLP_CMDW_DECONFIGURE_IOA:
 239     case SCLP_CMD_READ_EVENT_DATA:
 240     case SCLP_CMD_WRITE_EVENT_DATA:
 241     case SCLP_CMD_WRITE_EVENT_MASK:
 242         break;
 243     default:
 244         work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 245         goto out_write;
 246     }
 247
 248     if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) {
 249         work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
 250         goto out_write;
 251     }
 252
 253     sclp_c->execute(sclp, &work_sccb, code);
 254 out_write:
 255     cpu_physical_memory_write(sccb, &work_sccb,
 256                               be16_to_cpu(work_sccb.h.length));
 257
 258     sclp_c->service_interrupt(sclp, sccb);
 259
 260 out:
 261     return r;
 262 }
 263
 264 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
 265 {
 266     SCLPEventFacility *ef = sclp->event_facility;
 267     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 268
 269     uint32_t param = sccb & ~3;
 270
 271     /* Indicate whether an event is still pending */
 272     param |= efc->event_pending(ef) ? 1 : 0;
 273
 274     if (!param) {
 275         /* No need to send an interrupt, there's nothing to be notified about */
 276         return;
 277     }
 278     s390_sclp_extint(param);
 279 }
 280
 281 void sclp_service_interrupt(uint32_t sccb)
 282 {
 283     SCLPDevice *sclp = get_sclp_device();
 284     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 285
 286     sclp_c->service_interrupt(sclp, sccb);
 287 }
 288
 289 /* qemu object creation and initialization functions */
 290
 291 void s390_sclp_init(void)
 292 {
 293     Object *new = object_new(TYPE_SCLP);
 294
 295     object_property_add_child(qdev_get_machine(), TYPE_SCLP, new,
 296                               NULL);
 297     object_unref(OBJECT(new));
 298     qdev_init_nofail(DEVICE(new));
 299 }
 300
 301 static void sclp_realize(DeviceState *dev, Error **errp)
 302 {
 303     MachineState *machine = MACHINE(qdev_get_machine());
 304     SCLPDevice *sclp = SCLP(dev);
 305     Error *err = NULL;
 306     uint64_t hw_limit;
 307     int ret;
 308
 309     object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
 310                              &err);
 311     if (err) {
 312         goto out;
 313     }
 314     /*
 315      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
 316      * as we can't find a fitting bus via the qom tree, we have to add the
 317      * event facility to the sysbus, so e.g. a sclp console can be created.
 318      */
 319     qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
 320
 321     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
 322     if (ret == -E2BIG) {
 323         error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
 324                    hw_limit / GiB);
 325     } else if (ret) {
 326         error_setg(&err, "setting the guest size failed");
 327     }
 328
 329 out:
 330     error_propagate(errp, err);
 331 }
 332
 333 static void sclp_memory_init(SCLPDevice *sclp)
 334 {
 335     MachineState *machine = MACHINE(qdev_get_machine());
 336     ram_addr_t initial_mem = machine->ram_size;
 337     int increment_size = 20;
 338
 339     /* The storage increment size is a multiple of 1M and is a power of 2.
 340      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
 341      * The variable 'increment_size' is an exponent of 2 that can be
 342      * used to calculate the size (in bytes) of an increment. */
 343     while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
 344         increment_size++;
 345     }
 346     sclp->increment_size = increment_size;
 347
 348     /* The core memory area needs to be aligned with the increment size.
 349      * In effect, this can cause the user-specified memory size to be rounded
 350      * down to align with the nearest increment boundary. */
 351     initial_mem = initial_mem >> increment_size << increment_size;
 352
 353     machine->ram_size = initial_mem;
 354     machine->maxram_size = initial_mem;
 355     /* let's propagate the changed ram size into the global variable. */
 356     ram_size = initial_mem;
 357 }
 358
 359 static void sclp_init(Object *obj)
 360 {
 361     SCLPDevice *sclp = SCLP(obj);
 362     Object *new;
 363
 364     new = object_new(TYPE_SCLP_EVENT_FACILITY);
 365     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
 366     object_unref(new);
 367     sclp->event_facility = EVENT_FACILITY(new);
 368
 369     sclp_memory_init(sclp);
 370 }
 371
 372 static void sclp_class_init(ObjectClass *oc, void *data)
 373 {
 374     SCLPDeviceClass *sc = SCLP_CLASS(oc);
 375     DeviceClass *dc = DEVICE_CLASS(oc);
 376
 377     dc->desc = "SCLP (Service-Call Logical Processor)";
 378     dc->realize = sclp_realize;
 379     dc->hotpluggable = false;
 380     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 381     /*
 382      * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
 383      * which is a non-pluggable sysbus device
 384      */
 385     dc->user_creatable = false;
 386
 387     sc->read_SCP_info = read_SCP_info;
 388     sc->read_cpu_info = sclp_read_cpu_info;
 389     sc->execute = sclp_execute;
 390     sc->service_interrupt = service_interrupt;
 391 }
 392
 393 static TypeInfo sclp_info = {
 394     .name = TYPE_SCLP,
 395     .parent = TYPE_DEVICE,
 396     .instance_init = sclp_init,
 397     .instance_size = sizeof(SCLPDevice),
 398     .class_init = sclp_class_init,
 399     .class_size = sizeof(SCLPDeviceClass),
 400 };
 401
 402 static void register_types(void)
 403 {
 404     type_register_static(&sclp_info);
 405 }
 406 type_init(register_types);