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 NULL); 325 object_unref(OBJECT(new)); 326 qdev_init_nofail(DEVICE(new)); 327 } 328 329 static void sclp_realize(DeviceState *dev, Error **errp) 330 { 331 MachineState *machine = MACHINE(qdev_get_machine()); 332 SCLPDevice *sclp = SCLP(dev); 333 Error *err = NULL; 334 uint64_t hw_limit; 335 int ret; 336 337 object_property_set_bool(OBJECT(sclp->event_facility), true, "realized", 338 &err); 339 if (err) { 340 goto out; 341 } 342 /* 343 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long 344 * as we can't find a fitting bus via the qom tree, we have to add the 345 * event facility to the sysbus, so e.g. a sclp console can be created. 346 */ 347 qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default()); 348 349 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit); 350 if (ret == -E2BIG) { 351 error_setg(&err, "host supports a maximum of %" PRIu64 " GB", 352 hw_limit / GiB); 353 } else if (ret) { 354 error_setg(&err, "setting the guest size failed"); 355 } 356 357 out: 358 error_propagate(errp, err); 359 } 360 361 static void sclp_memory_init(SCLPDevice *sclp) 362 { 363 MachineState *machine = MACHINE(qdev_get_machine()); 364 MachineClass *machine_class = MACHINE_GET_CLASS(qdev_get_machine()); 365 ram_addr_t initial_mem = machine->ram_size; 366 int increment_size = 20; 367 368 /* The storage increment size is a multiple of 1M and is a power of 2. 369 * For some machine types, the number of storage increments must be 370 * MAX_STORAGE_INCREMENTS or fewer. 371 * The variable 'increment_size' is an exponent of 2 that can be 372 * used to calculate the size (in bytes) of an increment. */ 373 while (machine_class->fixup_ram_size != NULL && 374 (initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) { 375 increment_size++; 376 } 377 sclp->increment_size = increment_size; 378 } 379 380 static void sclp_init(Object *obj) 381 { 382 SCLPDevice *sclp = SCLP(obj); 383 Object *new; 384 385 new = object_new(TYPE_SCLP_EVENT_FACILITY); 386 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL); 387 object_unref(new); 388 sclp->event_facility = EVENT_FACILITY(new); 389 390 sclp_memory_init(sclp); 391 } 392 393 static void sclp_class_init(ObjectClass *oc, void *data) 394 { 395 SCLPDeviceClass *sc = SCLP_CLASS(oc); 396 DeviceClass *dc = DEVICE_CLASS(oc); 397 398 dc->desc = "SCLP (Service-Call Logical Processor)"; 399 dc->realize = sclp_realize; 400 dc->hotpluggable = false; 401 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 402 /* 403 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init 404 * which is a non-pluggable sysbus device 405 */ 406 dc->user_creatable = false; 407 408 sc->read_SCP_info = read_SCP_info; 409 sc->read_cpu_info = sclp_read_cpu_info; 410 sc->execute = sclp_execute; 411 sc->service_interrupt = service_interrupt; 412 } 413 414 static TypeInfo sclp_info = { 415 .name = TYPE_SCLP, 416 .parent = TYPE_DEVICE, 417 .instance_init = sclp_init, 418 .instance_size = sizeof(SCLPDevice), 419 .class_init = sclp_class_init, 420 .class_size = sizeof(SCLPDeviceClass), 421 }; 422 423 static void register_types(void) 424 { 425 type_register_static(&sclp_info); 426 } 427 type_init(register_types); 428