LXR qemu/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
  26static 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
  36static 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
  52static 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 */
  71static 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 */
 133static 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
 157static 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
 186static 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
 217int 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);
 233out_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
 240int 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);
 283out_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
 292static 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
 309void 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
 319void 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
 328static 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
 353static 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
 372static 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
 385static 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
 406static 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
 415static void register_types(void)
 416{
 417    type_register_static(&sclp_info);
 418}
 419type_init(register_types);
 420