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 "cpu.h"
  16 #include "sysemu/kvm.h"
  17 #include "exec/memory.h"
  18 #include "sysemu/sysemu.h"
  19 #include "exec/address-spaces.h"
  20 #include "qemu/config-file.h"
  21 #include "hw/s390x/sclp.h"
  22 #include "hw/s390x/event-facility.h"
  23 #include "hw/s390x/s390-pci-bus.h"
  24
  25 static inline SCLPEventFacility *get_event_facility(void)
  26 {
  27     ObjectProperty *op = object_property_find(qdev_get_machine(),
  28                                               TYPE_SCLP_EVENT_FACILITY,
  29                                               NULL);
  30     assert(op);
  31     return op->opaque;
  32 }
  33
  34 /* Provide information about the configuration, CPUs and storage */
  35 static void read_SCP_info(SCCB *sccb)
  36 {
  37     ReadInfo *read_info = (ReadInfo *) sccb;
  38     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
  39     CPUState *cpu;
  40     int cpu_count = 0;
  41     int i = 0;
  42     int increment_size = 20;
  43     int rnsize, rnmax;
  44     QemuOpts *opts = qemu_opts_find(qemu_find_opts("memory"), NULL);
  45     int slots = qemu_opt_get_number(opts, "slots", 0);
  46     int max_avail_slots = s390_get_memslot_count(kvm_state);
  47
  48     if (slots > max_avail_slots) {
  49         slots = max_avail_slots;
  50     }
  51
  52     CPU_FOREACH(cpu) {
  53         cpu_count++;
  54     }
  55
  56     /* CPU information */
  57     read_info->entries_cpu = cpu_to_be16(cpu_count);
  58     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
  59     read_info->highest_cpu = cpu_to_be16(max_cpus);
  60
  61     for (i = 0; i < cpu_count; i++) {
  62         read_info->entries[i].address = i;
  63         read_info->entries[i].type = 0;
  64     }
  65
  66     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
  67                                         SCLP_HAS_PCI_RECONFIG);
  68
  69     /*
  70      * The storage increment size is a multiple of 1M and is a power of 2.
  71      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
  72      */
  73     while ((ram_size >> increment_size) > MAX_STORAGE_INCREMENTS) {
  74         increment_size++;
  75     }
  76     rnmax = ram_size >> increment_size;
  77
  78     /* Memory Hotplug is only supported for the ccw machine type */
  79     if (mhd) {
  80         while ((mhd->standby_mem_size >> increment_size) >
  81                MAX_STORAGE_INCREMENTS) {
  82             increment_size++;
  83         }
  84         assert(increment_size == mhd->increment_size);
  85
  86         mhd->standby_subregion_size = MEM_SECTION_SIZE;
  87         /* Deduct the memory slot already used for core */
  88         if (slots > 0) {
  89             while ((mhd->standby_subregion_size * (slots - 1)
  90                     < mhd->standby_mem_size)) {
  91                 mhd->standby_subregion_size = mhd->standby_subregion_size << 1;
  92             }
  93         }
  94         /*
  95          * Initialize mapping of guest standby memory sections indicating which
  96          * are and are not online. Assume all standby memory begins offline.
  97          */
  98         if (mhd->standby_state_map == 0) {
  99             if (mhd->standby_mem_size % mhd->standby_subregion_size) {
 100                 mhd->standby_state_map = g_malloc0((mhd->standby_mem_size /
 101                                              mhd->standby_subregion_size + 1) *
 102                                              (mhd->standby_subregion_size /
 103                                              MEM_SECTION_SIZE));
 104             } else {
 105                 mhd->standby_state_map = g_malloc0(mhd->standby_mem_size /
 106                                                    MEM_SECTION_SIZE);
 107             }
 108         }
 109         mhd->padded_ram_size = ram_size + mhd->pad_size;
 110         mhd->rzm = 1 << mhd->increment_size;
 111         rnmax = ((ram_size + mhd->standby_mem_size + mhd->pad_size)
 112              >> mhd->increment_size);
 113
 114         read_info->facilities |= cpu_to_be64(SCLP_FC_ASSIGN_ATTACH_READ_STOR);
 115     }
 116
 117     rnsize = 1 << (increment_size - 20);
 118     if (rnsize <= 128) {
 119         read_info->rnsize = rnsize;
 120     } else {
 121         read_info->rnsize = 0;
 122         read_info->rnsize2 = cpu_to_be32(rnsize);
 123     }
 124
 125     if (rnmax < 0x10000) {
 126         read_info->rnmax = cpu_to_be16(rnmax);
 127     } else {
 128         read_info->rnmax = cpu_to_be16(0);
 129         read_info->rnmax2 = cpu_to_be64(rnmax);
 130     }
 131
 132     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 133 }
 134
 135 static void read_storage_element0_info(SCCB *sccb)
 136 {
 137     int i, assigned;
 138     int subincrement_id = SCLP_STARTING_SUBINCREMENT_ID;
 139     ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
 140     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 141
 142     assert(mhd);
 143
 144     if ((ram_size >> mhd->increment_size) >= 0x10000) {
 145         sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
 146         return;
 147     }
 148
 149     /* Return information regarding core memory */
 150     storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
 151     assigned = ram_size >> mhd->increment_size;
 152     storage_info->assigned = cpu_to_be16(assigned);
 153
 154     for (i = 0; i < assigned; i++) {
 155         storage_info->entries[i] = cpu_to_be32(subincrement_id);
 156         subincrement_id += SCLP_INCREMENT_UNIT;
 157     }
 158     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 159 }
 160
 161 static void read_storage_element1_info(SCCB *sccb)
 162 {
 163     ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
 164     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 165
 166     assert(mhd);
 167
 168     if ((mhd->standby_mem_size >> mhd->increment_size) >= 0x10000) {
 169         sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
 170         return;
 171     }
 172
 173     /* Return information regarding standby memory */
 174     storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
 175     storage_info->assigned = cpu_to_be16(mhd->standby_mem_size >>
 176                                          mhd->increment_size);
 177     storage_info->standby = cpu_to_be16(mhd->standby_mem_size >>
 178                                         mhd->increment_size);
 179     sccb->h.response_code = cpu_to_be16(SCLP_RC_STANDBY_READ_COMPLETION);
 180 }
 181
 182 static void attach_storage_element(SCCB *sccb, uint16_t element)
 183 {
 184     int i, assigned, subincrement_id;
 185     AttachStorageElement *attach_info = (AttachStorageElement *) sccb;
 186     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 187
 188     assert(mhd);
 189
 190     if (element != 1) {
 191         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 192         return;
 193     }
 194
 195     assigned = mhd->standby_mem_size >> mhd->increment_size;
 196     attach_info->assigned = cpu_to_be16(assigned);
 197     subincrement_id = ((ram_size >> mhd->increment_size) << 16)
 198                       + SCLP_STARTING_SUBINCREMENT_ID;
 199     for (i = 0; i < assigned; i++) {
 200         attach_info->entries[i] = cpu_to_be32(subincrement_id);
 201         subincrement_id += SCLP_INCREMENT_UNIT;
 202     }
 203     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
 204 }
 205
 206 static void assign_storage(SCCB *sccb)
 207 {
 208     MemoryRegion *mr = NULL;
 209     uint64_t this_subregion_size;
 210     AssignStorage *assign_info = (AssignStorage *) sccb;
 211     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 212     assert(mhd);
 213     ram_addr_t assign_addr = (assign_info->rn - 1) * mhd->rzm;
 214     MemoryRegion *sysmem = get_system_memory();
 215
 216     if ((assign_addr % MEM_SECTION_SIZE == 0) &&
 217         (assign_addr >= mhd->padded_ram_size)) {
 218         /* Re-use existing memory region if found */
 219         mr = memory_region_find(sysmem, assign_addr, 1).mr;
 220         if (!mr) {
 221
 222             MemoryRegion *standby_ram = g_new(MemoryRegion, 1);
 223
 224             /* offset to align to standby_subregion_size for allocation */
 225             ram_addr_t offset = assign_addr -
 226                                 (assign_addr - mhd->padded_ram_size)
 227                                 % mhd->standby_subregion_size;
 228
 229             /* strlen("standby.ram") + 4 (Max of KVM_MEMORY_SLOTS) +  NULL */
 230             char id[16];
 231             snprintf(id, 16, "standby.ram%d",
 232                      (int)((offset - mhd->padded_ram_size) /
 233                      mhd->standby_subregion_size) + 1);
 234
 235             /* Allocate a subregion of the calculated standby_subregion_size */
 236             if (offset + mhd->standby_subregion_size >
 237                 mhd->padded_ram_size + mhd->standby_mem_size) {
 238                 this_subregion_size = mhd->padded_ram_size +
 239                   mhd->standby_mem_size - offset;
 240             } else {
 241                 this_subregion_size = mhd->standby_subregion_size;
 242             }
 243
 244             memory_region_init_ram(standby_ram, NULL, id, this_subregion_size, &error_abort);
 245             vmstate_register_ram_global(standby_ram);
 246             memory_region_add_subregion(sysmem, offset, standby_ram);
 247         }
 248         /* The specified subregion is no longer in standby */
 249         mhd->standby_state_map[(assign_addr - mhd->padded_ram_size)
 250                                / MEM_SECTION_SIZE] = 1;
 251     }
 252     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
 253 }
 254
 255 static void unassign_storage(SCCB *sccb)
 256 {
 257     MemoryRegion *mr = NULL;
 258     AssignStorage *assign_info = (AssignStorage *) sccb;
 259     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 260     assert(mhd);
 261     ram_addr_t unassign_addr = (assign_info->rn - 1) * mhd->rzm;
 262     MemoryRegion *sysmem = get_system_memory();
 263
 264     /* if the addr is a multiple of 256 MB */
 265     if ((unassign_addr % MEM_SECTION_SIZE == 0) &&
 266         (unassign_addr >= mhd->padded_ram_size)) {
 267         mhd->standby_state_map[(unassign_addr -
 268                            mhd->padded_ram_size) / MEM_SECTION_SIZE] = 0;
 269
 270         /* find the specified memory region and destroy it */
 271         mr = memory_region_find(sysmem, unassign_addr, 1).mr;
 272         if (mr) {
 273             int i;
 274             int is_removable = 1;
 275             ram_addr_t map_offset = (unassign_addr - mhd->padded_ram_size -
 276                                      (unassign_addr - mhd->padded_ram_size)
 277                                      % mhd->standby_subregion_size);
 278             /* Mark all affected subregions as 'standby' once again */
 279             for (i = 0;
 280                  i < (mhd->standby_subregion_size / MEM_SECTION_SIZE);
 281                  i++) {
 282
 283                 if (mhd->standby_state_map[i + map_offset / MEM_SECTION_SIZE]) {
 284                     is_removable = 0;
 285                     break;
 286                 }
 287             }
 288             if (is_removable) {
 289                 memory_region_del_subregion(sysmem, mr);
 290                 object_unparent(OBJECT(mr));
 291                 g_free(mr);
 292             }
 293         }
 294     }
 295     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
 296 }
 297
 298 /* Provide information about the CPU */
 299 static void sclp_read_cpu_info(SCCB *sccb)
 300 {
 301     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
 302     CPUState *cpu;
 303     int cpu_count = 0;
 304     int i = 0;
 305
 306     CPU_FOREACH(cpu) {
 307         cpu_count++;
 308     }
 309
 310     cpu_info->nr_configured = cpu_to_be16(cpu_count);
 311     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
 312     cpu_info->nr_standby = cpu_to_be16(0);
 313
 314     /* The standby offset is 16-byte for each CPU */
 315     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
 316         + cpu_info->nr_configured*sizeof(CPUEntry));
 317
 318     for (i = 0; i < cpu_count; i++) {
 319         cpu_info->entries[i].address = i;
 320         cpu_info->entries[i].type = 0;
 321     }
 322
 323     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 324 }
 325
 326 static void sclp_execute(SCCB *sccb, uint32_t code)
 327 {
 328     SCLPEventFacility *ef = get_event_facility();
 329     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 330
 331     switch (code & SCLP_CMD_CODE_MASK) {
 332     case SCLP_CMDW_READ_SCP_INFO:
 333     case SCLP_CMDW_READ_SCP_INFO_FORCED:
 334         read_SCP_info(sccb);
 335         break;
 336     case SCLP_CMDW_READ_CPU_INFO:
 337         sclp_read_cpu_info(sccb);
 338         break;
 339     case SCLP_READ_STORAGE_ELEMENT_INFO:
 340         if (code & 0xff00) {
 341             read_storage_element1_info(sccb);
 342         } else {
 343             read_storage_element0_info(sccb);
 344         }
 345         break;
 346     case SCLP_ATTACH_STORAGE_ELEMENT:
 347         attach_storage_element(sccb, (code & 0xff00) >> 8);
 348         break;
 349     case SCLP_ASSIGN_STORAGE:
 350         assign_storage(sccb);
 351         break;
 352     case SCLP_UNASSIGN_STORAGE:
 353         unassign_storage(sccb);
 354         break;
 355     case SCLP_CMDW_CONFIGURE_PCI:
 356         s390_pci_sclp_configure(1, sccb);
 357         break;
 358     case SCLP_CMDW_DECONFIGURE_PCI:
 359         s390_pci_sclp_configure(0, sccb);
 360         break;
 361     default:
 362         efc->command_handler(ef, sccb, code);
 363         break;
 364     }
 365 }
 366
 367 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
 368 {
 369     int r = 0;
 370     SCCB work_sccb;
 371
 372     hwaddr sccb_len = sizeof(SCCB);
 373
 374     /* first some basic checks on program checks */
 375     if (env->psw.mask & PSW_MASK_PSTATE) {
 376         r = -PGM_PRIVILEGED;
 377         goto out;
 378     }
 379     if (cpu_physical_memory_is_io(sccb)) {
 380         r = -PGM_ADDRESSING;
 381         goto out;
 382     }
 383     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
 384         || (sccb & ~0x7ffffff8UL) != 0) {
 385         r = -PGM_SPECIFICATION;
 386         goto out;
 387     }
 388
 389     /*
 390      * we want to work on a private copy of the sccb, to prevent guests
 391      * from playing dirty tricks by modifying the memory content after
 392      * the host has checked the values
 393      */
 394     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
 395
 396     /* Valid sccb sizes */
 397     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
 398         be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
 399         r = -PGM_SPECIFICATION;
 400         goto out;
 401     }
 402
 403     sclp_execute((SCCB *)&work_sccb, code);
 404
 405     cpu_physical_memory_write(sccb, &work_sccb,
 406                               be16_to_cpu(work_sccb.h.length));
 407
 408     sclp_service_interrupt(sccb);
 409
 410 out:
 411     return r;
 412 }
 413
 414 void sclp_service_interrupt(uint32_t sccb)
 415 {
 416     SCLPEventFacility *ef = get_event_facility();
 417     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 418
 419     uint32_t param = sccb & ~3;
 420
 421     /* Indicate whether an event is still pending */
 422     param |= efc->event_pending(ef) ? 1 : 0;
 423
 424     if (!param) {
 425         /* No need to send an interrupt, there's nothing to be notified about */
 426         return;
 427     }
 428     s390_sclp_extint(param);
 429 }
 430
 431 /* qemu object creation and initialization functions */
 432
 433 void s390_sclp_init(void)
 434 {
 435     DeviceState *dev  = qdev_create(NULL, TYPE_SCLP_EVENT_FACILITY);
 436
 437     object_property_add_child(qdev_get_machine(), TYPE_SCLP_EVENT_FACILITY,
 438                               OBJECT(dev), NULL);
 439     qdev_init_nofail(dev);
 440 }
 441
 442 sclpMemoryHotplugDev *init_sclp_memory_hotplug_dev(void)
 443 {
 444     DeviceState *dev;
 445     dev = qdev_create(NULL, TYPE_SCLP_MEMORY_HOTPLUG_DEV);
 446     object_property_add_child(qdev_get_machine(),
 447                               TYPE_SCLP_MEMORY_HOTPLUG_DEV,
 448                               OBJECT(dev), NULL);
 449     qdev_init_nofail(dev);
 450     return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
 451                                    TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
 452 }
 453
 454 sclpMemoryHotplugDev *get_sclp_memory_hotplug_dev(void)
 455 {
 456     return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
 457                                    TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
 458 }
 459
 460 static void sclp_memory_hotplug_dev_class_init(ObjectClass *klass,
 461                                                void *data)
 462 {
 463     DeviceClass *dc = DEVICE_CLASS(klass);
 464
 465     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 466 }
 467
 468 static TypeInfo sclp_memory_hotplug_dev_info = {
 469     .name = TYPE_SCLP_MEMORY_HOTPLUG_DEV,
 470     .parent = TYPE_SYS_BUS_DEVICE,
 471     .instance_size = sizeof(sclpMemoryHotplugDev),
 472     .class_init = sclp_memory_hotplug_dev_class_init,
 473 };
 474
 475 static void register_types(void)
 476 {
 477     type_register_static(&sclp_memory_hotplug_dev_info);
 478 }
 479 type_init(register_types);