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 SCCB work_sccb; 201 202 hwaddr sccb_len = sizeof(SCCB); 203 204 /* first some basic checks on program checks */ 205 if (env->psw.mask & PSW_MASK_PSTATE) { 206 return -PGM_PRIVILEGED; 207 } 208 if (cpu_physical_memory_is_io(sccb)) { 209 return -PGM_ADDRESSING; 210 } 211 if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa 212 || (sccb & ~0x7ffffff8UL) != 0) { 213 return -PGM_SPECIFICATION; 214 } 215 216 /* 217 * we want to work on a private copy of the sccb, to prevent guests 218 * from playing dirty tricks by modifying the memory content after 219 * the host has checked the values 220 */ 221 cpu_physical_memory_read(sccb, &work_sccb, sccb_len); 222 223 /* Valid sccb sizes */ 224 if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader)) { 225 return -PGM_SPECIFICATION; 226 } 227 228 switch (code & SCLP_CMD_CODE_MASK) { 229 case SCLP_CMDW_READ_SCP_INFO: 230 case SCLP_CMDW_READ_SCP_INFO_FORCED: 231 case SCLP_CMDW_READ_CPU_INFO: 232 case SCLP_CMDW_CONFIGURE_IOA: 233 case SCLP_CMDW_DECONFIGURE_IOA: 234 case SCLP_CMD_READ_EVENT_DATA: 235 case SCLP_CMD_WRITE_EVENT_DATA: 236 case SCLP_CMD_WRITE_EVENT_MASK: 237 break; 238 default: 239 work_sccb.h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND); 240 goto out_write; 241 } 242 243 if ((sccb + be16_to_cpu(work_sccb.h.length)) > ((sccb & PAGE_MASK) + PAGE_SIZE)) { 244 work_sccb.h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION); 245 goto out_write; 246 } 247 248 sclp_c->execute(sclp, &work_sccb, code); 249 out_write: 250 cpu_physical_memory_write(sccb, &work_sccb, 251 be16_to_cpu(work_sccb.h.length)); 252 253 sclp_c->service_interrupt(sclp, sccb); 254 255 return 0; 256 } 257 258 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb) 259 { 260 SCLPEventFacility *ef = sclp->event_facility; 261 SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef); 262 263 uint32_t param = sccb & ~3; 264 265 /* Indicate whether an event is still pending */ 266 param |= efc->event_pending(ef) ? 1 : 0; 267 268 if (!param) { 269 /* No need to send an interrupt, there's nothing to be notified about */ 270 return; 271 } 272 s390_sclp_extint(param); 273 } 274 275 void sclp_service_interrupt(uint32_t sccb) 276 { 277 SCLPDevice *sclp = get_sclp_device(); 278 SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp); 279 280 sclp_c->service_interrupt(sclp, sccb); 281 } 282 283 /* qemu object creation and initialization functions */ 284 285 void s390_sclp_init(void) 286 { 287 Object *new = object_new(TYPE_SCLP); 288 289 object_property_add_child(qdev_get_machine(), TYPE_SCLP, new, 290 NULL); 291 object_unref(OBJECT(new)); 292 qdev_init_nofail(DEVICE(new)); 293 } 294 295 static void sclp_realize(DeviceState *dev, Error **errp) 296 { 297 MachineState *machine = MACHINE(qdev_get_machine()); 298 SCLPDevice *sclp = SCLP(dev); 299 Error *err = NULL; 300 uint64_t hw_limit; 301 int ret; 302 303 object_property_set_bool(OBJECT(sclp->event_facility), true, "realized", 304 &err); 305 if (err) { 306 goto out; 307 } 308 /* 309 * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long 310 * as we can't find a fitting bus via the qom tree, we have to add the 311 * event facility to the sysbus, so e.g. a sclp console can be created. 312 */ 313 qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default()); 314 315 ret = s390_set_memory_limit(machine->maxram_size, &hw_limit); 316 if (ret == -E2BIG) { 317 error_setg(&err, "host supports a maximum of %" PRIu64 " GB", 318 hw_limit / GiB); 319 } else if (ret) { 320 error_setg(&err, "setting the guest size failed"); 321 } 322 323 out: 324 error_propagate(errp, err); 325 } 326 327 static void sclp_memory_init(SCLPDevice *sclp) 328 { 329 MachineState *machine = MACHINE(qdev_get_machine()); 330 ram_addr_t initial_mem = machine->ram_size; 331 int increment_size = 20; 332 333 /* The storage increment size is a multiple of 1M and is a power of 2. 334 * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer. 335 * The variable 'increment_size' is an exponent of 2 that can be 336 * used to calculate the size (in bytes) of an increment. */ 337 while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) { 338 increment_size++; 339 } 340 sclp->increment_size = increment_size; 341 342 /* The core memory area needs to be aligned with the increment size. 343 * In effect, this can cause the user-specified memory size to be rounded 344 * down to align with the nearest increment boundary. */ 345 initial_mem = initial_mem >> increment_size << increment_size; 346 347 machine->ram_size = initial_mem; 348 machine->maxram_size = initial_mem; 349 /* let's propagate the changed ram size into the global variable. */ 350 ram_size = initial_mem; 351 } 352 353 static void sclp_init(Object *obj) 354 { 355 SCLPDevice *sclp = SCLP(obj); 356 Object *new; 357 358 new = object_new(TYPE_SCLP_EVENT_FACILITY); 359 object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL); 360 object_unref(new); 361 sclp->event_facility = EVENT_FACILITY(new); 362 363 sclp_memory_init(sclp); 364 } 365 366 static void sclp_class_init(ObjectClass *oc, void *data) 367 { 368 SCLPDeviceClass *sc = SCLP_CLASS(oc); 369 DeviceClass *dc = DEVICE_CLASS(oc); 370 371 dc->desc = "SCLP (Service-Call Logical Processor)"; 372 dc->realize = sclp_realize; 373 dc->hotpluggable = false; 374 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 375 /* 376 * Reason: Creates TYPE_SCLP_EVENT_FACILITY in sclp_init 377 * which is a non-pluggable sysbus device 378 */ 379 dc->user_creatable = false; 380 381 sc->read_SCP_info = read_SCP_info; 382 sc->read_cpu_info = sclp_read_cpu_info; 383 sc->execute = sclp_execute; 384 sc->service_interrupt = service_interrupt; 385 } 386 387 static TypeInfo sclp_info = { 388 .name = TYPE_SCLP, 389 .parent = TYPE_DEVICE, 390 .instance_init = sclp_init, 391 .instance_size = sizeof(SCLPDevice), 392 .class_init = sclp_class_init, 393 .class_size = sizeof(SCLPDeviceClass), 394 }; 395 396 static void register_types(void) 397 { 398 type_register_static(&sclp_info); 399 } 400 type_init(register_types); 401