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 inline bool sclp_command_code_valid(uint32_t code)
  37 {
  38     switch (code & SCLP_CMD_CODE_MASK) {
  39     case SCLP_CMDW_READ_SCP_INFO:
  40     case SCLP_CMDW_READ_SCP_INFO_FORCED:
  41     case SCLP_CMDW_READ_CPU_INFO:
  42     case SCLP_CMDW_CONFIGURE_IOA:
  43     case SCLP_CMDW_DECONFIGURE_IOA:
  44     case SCLP_CMD_READ_EVENT_DATA:
  45     case SCLP_CMD_WRITE_EVENT_DATA:
  46     case SCLP_CMD_WRITE_EVENT_MASK:
  47         return true;
  48     }
  49     return false;
  50 }
  51
  52 static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int *count)
  53 {
  54     MachineState *ms = MACHINE(qdev_get_machine());
  55     uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
  56     int i;
  57
  58     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
  59     for (i = 0, *count = 0; i < ms->possible_cpus->len; i++) {
  60         if (!ms->possible_cpus->cpus[i].cpu) {
  61             continue;
  62         }
  63         entry[*count].address = ms->possible_cpus->cpus[i].arch_id;
  64         entry[*count].type = 0;
  65         memcpy(entry[*count].features, features, sizeof(features));
  66         (*count)++;
  67     }
  68 }
  69
  70 /* Provide information about the configuration, CPUs and storage */
  71 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
  72 {
  73     ReadInfo *read_info = (ReadInfo *) sccb;
  74     MachineState *machine = MACHINE(qdev_get_machine());
  75     int cpu_count;
  76     int rnsize, rnmax;
  77     IplParameterBlock *ipib = s390_ipl_get_iplb();
  78
  79     /* CPU information */
  80     prepare_cpu_entries(sclp, read_info->entries, &cpu_count);
  81     read_info->entries_cpu = cpu_to_be16(cpu_count);
  82     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
  83     read_info->highest_cpu = cpu_to_be16(machine->smp.max_cpus - 1);
  84
  85     read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
  86
  87     if (be16_to_cpu(sccb->h.length) <
  88             (sizeof(ReadInfo) + cpu_count * sizeof(CPUEntry))) {
  89         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
  90         return;
  91     }
  92
  93     /* Configuration Characteristic (Extension) */
  94     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
  95                          read_info->conf_char);
  96     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
  97                          read_info->conf_char_ext);
  98
  99     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
 100                                         SCLP_HAS_IOA_RECONFIG);
 101
 102     read_info->mha_pow = s390_get_mha_pow();
 103     read_info->hmfai = cpu_to_be32(s390_get_hmfai());
 104
 105     rnsize = 1 << (sclp->increment_size - 20);
 106     if (rnsize <= 128) {
 107         read_info->rnsize = rnsize;
 108     } else {
 109         read_info->rnsize = 0;
 110         read_info->rnsize2 = cpu_to_be32(rnsize);
 111     }
 112
 113     /* we don't support standby memory, maxram_size is never exposed */
 114     rnmax = machine->ram_size >> sclp->increment_size;
 115     if (rnmax < 0x10000) {
 116         read_info->rnmax = cpu_to_be16(rnmax);
 117     } else {
 118         read_info->rnmax = cpu_to_be16(0);
 119         read_info->rnmax2 = cpu_to_be64(rnmax);
 120     }
 121
 122     if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
 123         memcpy(&read_info->loadparm, &ipib->loadparm,
 124                sizeof(read_info->loadparm));
 125     } else {
 126         s390_ipl_set_loadparm(read_info->loadparm);
 127     }
 128
 129     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 130 }
 131
 132 /* Provide information about the CPU */
 133 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
 134 {
 135     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
 136     int cpu_count;
 137
 138     prepare_cpu_entries(sclp, cpu_info->entries, &cpu_count);
 139     cpu_info->nr_configured = cpu_to_be16(cpu_count);
 140     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
 141     cpu_info->nr_standby = cpu_to_be16(0);
 142
 143     if (be16_to_cpu(sccb->h.length) <
 144             (sizeof(ReadCpuInfo) + cpu_count * sizeof(CPUEntry))) {
 145         sccb->h.response_code = cpu_to_be16(SCLP_RC_INSUFFICIENT_SCCB_LENGTH);
 146         return;
 147     }
 148
 149     /* The standby offset is 16-byte for each CPU */
 150     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
 151         + cpu_info->nr_configured*sizeof(CPUEntry));
 152
 153
 154     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 155 }
 156
 157 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
 158                                       bool configure)
 159 {
 160     int rc;
 161
 162     if (be16_to_cpu(sccb->h.length) < 16) {
 163         rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
 164         goto out_err;
 165     }
 166
 167     switch (((IoaCfgSccb *)sccb)->atype) {
 168     case SCLP_RECONFIG_PCI_ATYPE:
 169         if (s390_has_feat(S390_FEAT_ZPCI)) {
 170             if (configure) {
 171                 s390_pci_sclp_configure(sccb);
 172             } else {
 173                 s390_pci_sclp_deconfigure(sccb);
 174             }
 175             return;
 176         }
 177         /* fallthrough */
 178     default:
 179         rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
 180     }
 181
 182  out_err:
 183     sccb->h.response_code = cpu_to_be16(rc);
 184 }
 185
 186 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
 187 {
 188     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 189     SCLPEventFacility *ef = sclp->event_facility;
 190     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 191
 192     switch (code & SCLP_CMD_CODE_MASK) {
 193     case SCLP_CMDW_READ_SCP_INFO:
 194     case SCLP_CMDW_READ_SCP_INFO_FORCED:
 195         sclp_c->read_SCP_info(sclp, sccb);
 196         break;
 197     case SCLP_CMDW_READ_CPU_INFO:
 198         sclp_c->read_cpu_info(sclp, sccb);
 199         break;
 200     case SCLP_CMDW_CONFIGURE_IOA:
 201         sclp_configure_io_adapter(sclp, sccb, true);
 202         break;
 203     case SCLP_CMDW_DECONFIGURE_IOA:
 204         sclp_configure_io_adapter(sclp, sccb, false);
 205         break;
 206     default:
 207         efc->command_handler(ef, sccb, code);
 208         break;
 209     }
 210 }
 211
 212 /*
 213  * We only need the address to have something valid for the
 214  * service_interrupt call.
 215  */
 216 #define SCLP_PV_DUMMY_ADDR 0x4000
 217 int sclp_service_call_protected(CPUS390XState *env, uint64_t sccb,
 218                                 uint32_t code)
 219 {
 220     SCLPDevice *sclp = get_sclp_device();
 221     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 222     SCCB work_sccb;
 223     hwaddr sccb_len = sizeof(SCCB);
 224
 225     s390_cpu_pv_mem_read(env_archcpu(env), 0, &work_sccb, sccb_len);
 226
 227     if (!sclp_command_code_valid(code)) {
 228         work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 229         goto out_write;
 230     }
 231
 232     sclp_c->execute(sclp, &work_sccb, code);
 233 out_write:
 234     s390_cpu_pv_mem_write(env_archcpu(env), 0, &work_sccb,
 235                           be16_to_cpu(work_sccb.h.length));
 236     sclp_c->service_interrupt(sclp, SCLP_PV_DUMMY_ADDR);
 237     return 0;
 238 }
 239
 240 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
 241 {
 242     SCLPDevice *sclp = get_sclp_device();
 243     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 244     SCCB work_sccb;
 245
 246     hwaddr sccb_len = sizeof(SCCB);
 247
 248     /* first some basic checks on program checks */
 249     if (env->psw.mask & PSW_MASK_PSTATE) {
 250         return -PGM_PRIVILEGED;
 251     }
 252     if (cpu_physical_memory_is_io(sccb)) {
 253         return -PGM_ADDRESSING;
 254     }
 255     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
 256         || (sccb & ~0x7ffffff8UL) != 0) {
 257         return -PGM_SPECIFICATION;
 258     }
 259
 260     /*
 261      * we want to work on a private copy of the sccb, to prevent guests
 262      * from playing dirty tricks by modifying the memory content after
 263      * the host has checked the values
 264      */
 265     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
 266
 267     /* Valid sccb sizes */
 268     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader)) {
 269         return -PGM_SPECIFICATION;
 270     }
 271
 272     if (!sclp_command_code_valid(code)) {
 273         work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 274         goto out_write;
 275     }
 276
 277     if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) {
 278         work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
 279         goto out_write;
 280     }
 281
 282     sclp_c->execute(sclp, &work_sccb, code);
 283 out_write:
 284     cpu_physical_memory_write(sccb, &work_sccb,
 285                               be16_to_cpu(work_sccb.h.length));
 286
 287     sclp_c->service_interrupt(sclp, sccb);
 288
 289     return 0;
 290 }
 291
 292 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
 293 {
 294     SCLPEventFacility *ef = sclp->event_facility;
 295     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 296
 297     uint32_t param = sccb & ~3;
 298
 299     /* Indicate whether an event is still pending */
 300     param |= efc->event_pending(ef) ? 1 : 0;
 301
 302     if (!param) {
 303         /* No need to send an interrupt, there's nothing to be notified about */
 304         return;
 305     }
 306     s390_sclp_extint(param);
 307 }
 308
 309 void sclp_service_interrupt(uint32_t sccb)
 310 {
 311     SCLPDevice *sclp = get_sclp_device();
 312     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 313
 314     sclp_c->service_interrupt(sclp, sccb);
 315 }
 316
 317 /* qemu object creation and initialization functions */
 318
 319 void s390_sclp_init(void)
 320 {
 321     Object *new = object_new(TYPE_SCLP);
 322
 323     object_property_add_child(qdev_get_machine(), TYPE_SCLP, new);
 324     object_unref(new);
 325     qdev_realize(DEVICE(new), NULL, &error_fatal);
 326 }
 327
 328 static void sclp_realize(DeviceState *dev, Error **errp)
 329 {
 330     MachineState *machine = MACHINE(qdev_get_machine());
 331     SCLPDevice *sclp = SCLP(dev);
 332     uint64_t hw_limit;
 333     int ret;
 334
 335     /*
 336      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
 337      * as we can't find a fitting bus via the qom tree, we have to add the
 338      * event facility to the sysbus, so e.g. a sclp console can be created.
 339      */
 340     if (!sysbus_realize(SYS_BUS_DEVICE(sclp->event_facility), errp)) {
 341         return;
 342     }
 343
 344     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
 345     if (ret == -E2BIG) {
 346         error_setg(errp, "host supports a maximum of %" PRIu64 " GB",
 347                    hw_limit / GiB);
 348     } else if (ret) {
 349         error_setg(errp, "setting the guest size failed");
 350     }
 351 }
 352
 353 static void sclp_memory_init(SCLPDevice *sclp)
 354 {
 355     MachineState *machine = MACHINE(qdev_get_machine());
 356     MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine());
 357     ram_addr_t initial_mem = machine->ram_size;
 358     int increment_size = 20;
 359
 360     /* The storage increment size is a multiple of 1M and is a power of 2.
 361      * For some machine types, the number of storage increments must be
 362      * MAX_STORAGE_INCREMENTS or fewer.
 363      * The variable 'increment_size' is an exponent of 2 that can be
 364      * used to calculate the size (in bytes) of an increment. */
 365     while (machine_class->fixup_ram_size != NULL &&
 366            (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
 367         increment_size++;
 368     }
 369     sclp->increment_size = increment_size;
 370 }
 371
 372 static void sclp_init(Object *obj)
 373 {
 374     SCLPDevice *sclp = SCLP(obj);
 375     Object *new;
 376
 377     new = object_new(TYPE_SCLP_EVENT_FACILITY);
 378     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new);
 379     object_unref(new);
 380     sclp->event_facility = EVENT_FACILITY(new);
 381
 382     sclp_memory_init(sclp);
 383 }
 384
 385 static void sclp_class_init(ObjectClass *oc, void *data)
 386 {
 387     SCLPDeviceClass *sc = SCLP_CLASS(oc);
 388     DeviceClass *dc = DEVICE_CLASS(oc);
 389
 390     dc->desc = "SCLP (Service-Call Logical Processor)";
 391     dc->realize = sclp_realize;
 392     dc->hotpluggable = false;
 393     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 394     /*
 395      * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init
 396      * which is a non-pluggable sysbus device
 397      */
 398     dc->user_creatable = false;
 399
 400     sc->read_SCP_info = read_SCP_info;
 401     sc->read_cpu_info = sclp_read_cpu_info;
 402     sc->execute = sclp_execute;
 403     sc->service_interrupt = service_interrupt;
 404 }
 405
 406 static TypeInfo sclp_info = {
 407     .name = TYPE_SCLP,
 408     .parent = TYPE_DEVICE,
 409     .instance_init = sclp_init,
 410     .instance_size = sizeof(SCLPDevice),
 411     .class_init = sclp_class_init,
 412     .class_size = sizeof(SCLPDeviceClass),
 413 };
 414
 415 static void register_types(void)
 416 {
 417     type_register_static(&sclp_info);
 418 }
 419 type_init(register_types);