hw/ppc/spapr_rtas.c

   1 /*
   2  * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
   3  *
   4  * Hypercall based emulated RTAS
   5  *
   6  * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  21  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  24  * THE SOFTWARE.
  25  *
  26  */
  27 #include "qemu/osdep.h"
  28 #include "cpu.h"
  29 #include "qemu/log.h"
  30 #include "qemu/error-report.h"
  31 #include "sysemu/sysemu.h"
  32 #include "sysemu/device_tree.h"
  33 #include "sysemu/cpus.h"
  34 #include "sysemu/hw_accel.h"
  35 #include "kvm_ppc.h"
  36
  37 #include "hw/ppc/spapr.h"
  38 #include "hw/ppc/spapr_vio.h"
  39 #include "hw/ppc/spapr_rtas.h"
  40 #include "hw/ppc/spapr_cpu_core.h"
  41 #include "hw/ppc/ppc.h"
  42 #include "hw/boards.h"
  43
  44 #include <libfdt.h>
  45 #include "hw/ppc/spapr_drc.h"
  46 #include "qemu/cutils.h"
  47 #include "trace.h"
  48 #include "hw/ppc/fdt.h"
  49 #include "target/ppc/mmu-hash64.h"
  50 #include "target/ppc/mmu-book3s-v3.h"
  51
  52 static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spapr,
  53                                    uint32_t token, uint32_t nargs,
  54                                    target_ulong args,
  55                                    uint32_t nret, target_ulong rets)
  56 {
  57     uint8_t c = rtas_ld(args, 0);
  58     SpaprVioDevice *sdev = vty_lookup(spapr, 0);
  59
  60     if (!sdev) {
  61         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  62     } else {
  63         vty_putchars(sdev, &c, sizeof(c));
  64         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  65     }
  66 }
  67
  68 static void rtas_power_off(PowerPCCPU *cpu, SpaprMachineState *spapr,
  69                            uint32_t token, uint32_t nargs, target_ulong args,
  70                            uint32_t nret, target_ulong rets)
  71 {
  72     if (nargs != 2 || nret != 1) {
  73         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  74         return;
  75     }
  76     qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
  77     cpu_stop_current();
  78     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  79 }
  80
  81 static void rtas_system_reboot(PowerPCCPU *cpu, SpaprMachineState *spapr,
  82                                uint32_t token, uint32_t nargs,
  83                                target_ulong args,
  84                                uint32_t nret, target_ulong rets)
  85 {
  86     if (nargs != 0 || nret != 1) {
  87         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  88         return;
  89     }
  90     qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
  91     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  92 }
  93
  94 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
  95                                          SpaprMachineState *spapr,
  96                                          uint32_t token, uint32_t nargs,
  97                                          target_ulong args,
  98                                          uint32_t nret, target_ulong rets)
  99 {
 100     target_ulong id;
 101     PowerPCCPU *cpu;
 102
 103     if (nargs != 1 || nret != 2) {
 104         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 105         return;
 106     }
 107
 108     id = rtas_ld(args, 0);
 109     cpu = spapr_find_cpu(id);
 110     if (cpu != NULL) {
 111         if (CPU(cpu)->halted) {
 112             rtas_st(rets, 1, 0);
 113         } else {
 114             rtas_st(rets, 1, 2);
 115         }
 116
 117         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 118         return;
 119     }
 120
 121     /* Didn't find a matching cpu */
 122     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 123 }
 124
 125 static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr,
 126                            uint32_t token, uint32_t nargs,
 127                            target_ulong args,
 128                            uint32_t nret, target_ulong rets)
 129 {
 130     target_ulong id, start, r3;
 131     PowerPCCPU *newcpu;
 132     CPUPPCState *env;
 133     PowerPCCPUClass *pcc;
 134     target_ulong lpcr;
 135
 136     if (nargs != 3 || nret != 1) {
 137         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 138         return;
 139     }
 140
 141     id = rtas_ld(args, 0);
 142     start = rtas_ld(args, 1);
 143     r3 = rtas_ld(args, 2);
 144
 145     newcpu = spapr_find_cpu(id);
 146     if (!newcpu) {
 147         /* Didn't find a matching cpu */
 148         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 149         return;
 150     }
 151
 152     env = &newcpu->env;
 153     pcc = POWERPC_CPU_GET_CLASS(newcpu);
 154
 155     if (!CPU(newcpu)->halted) {
 156         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 157         return;
 158     }
 159
 160     cpu_synchronize_state(CPU(newcpu));
 161
 162     env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 163
 164     /* Enable Power-saving mode Exit Cause exceptions for the new CPU */
 165     lpcr = env->spr[SPR_LPCR];
 166     if (!pcc->interrupts_big_endian(callcpu)) {
 167         lpcr |= LPCR_ILE;
 168     }
 169     if (env->mmu_model == POWERPC_MMU_3_00) {
 170         /*
 171          * New cpus are expected to start in the same radix/hash mode
 172          * as the existing CPUs
 173          */
 174         if (ppc64_v3_radix(callcpu)) {
 175             lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
 176         } else {
 177             lpcr &= ~(LPCR_UPRT | LPCR_GTSE | LPCR_HR);
 178         }
 179         env->spr[SPR_PSSCR] &= ~PSSCR_EC;
 180     }
 181     ppc_store_lpcr(newcpu, lpcr);
 182
 183     /*
 184      * Set the timebase offset of the new CPU to that of the invoking
 185      * CPU.  This helps hotplugged CPU to have the correct timebase
 186      * offset.
 187      */
 188     newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
 189
 190     spapr_cpu_set_entry_state(newcpu, start, r3);
 191
 192     qemu_cpu_kick(CPU(newcpu));
 193
 194     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 195 }
 196
 197 static void rtas_stop_self(PowerPCCPU *cpu, SpaprMachineState *spapr,
 198                            uint32_t token, uint32_t nargs,
 199                            target_ulong args,
 200                            uint32_t nret, target_ulong rets)
 201 {
 202     CPUState *cs = CPU(cpu);
 203     CPUPPCState *env = &cpu->env;
 204     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
 205
 206     /* Disable Power-saving mode Exit Cause exceptions for the CPU.
 207      * This could deliver an interrupt on a dying CPU and crash the
 208      * guest.
 209      * For the same reason, set PSSCR_EC.
 210      */
 211     ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm);
 212     env->spr[SPR_PSSCR] |= PSSCR_EC;
 213     cs->halted = 1;
 214     kvmppc_set_reg_ppc_online(cpu, 0);
 215     qemu_cpu_kick(cs);
 216 }
 217
 218 static inline int sysparm_st(target_ulong addr, target_ulong len,
 219                              const void *val, uint16_t vallen)
 220 {
 221     hwaddr phys = ppc64_phys_to_real(addr);
 222
 223     if (len < 2) {
 224         return RTAS_OUT_SYSPARM_PARAM_ERROR;
 225     }
 226     stw_be_phys(&address_space_memory, phys, vallen);
 227     cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
 228     return RTAS_OUT_SUCCESS;
 229 }
 230
 231 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
 232                                           SpaprMachineState *spapr,
 233                                           uint32_t token, uint32_t nargs,
 234                                           target_ulong args,
 235                                           uint32_t nret, target_ulong rets)
 236 {
 237     MachineState *ms = MACHINE(qdev_get_machine());
 238     unsigned int max_cpus = ms->smp.max_cpus;
 239     target_ulong parameter = rtas_ld(args, 0);
 240     target_ulong buffer = rtas_ld(args, 1);
 241     target_ulong length = rtas_ld(args, 2);
 242     target_ulong ret;
 243
 244     switch (parameter) {
 245     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
 246         char *param_val = g_strdup_printf("MaxEntCap=%d,"
 247                                           "DesMem=%" PRIu64 ","
 248                                           "DesProcs=%d,"
 249                                           "MaxPlatProcs=%d",
 250                                           max_cpus,
 251                                           current_machine->ram_size / MiB,
 252                                           ms->smp.cpus,
 253                                           max_cpus);
 254         ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
 255         g_free(param_val);
 256         break;
 257     }
 258     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
 259         uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
 260
 261         ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
 262         break;
 263     }
 264     case RTAS_SYSPARM_UUID:
 265         ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid,
 266                          (qemu_uuid_set ? 16 : 0));
 267         break;
 268     default:
 269         ret = RTAS_OUT_NOT_SUPPORTED;
 270     }
 271
 272     rtas_st(rets, 0, ret);
 273 }
 274
 275 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
 276                                           SpaprMachineState *spapr,
 277                                           uint32_t token, uint32_t nargs,
 278                                           target_ulong args,
 279                                           uint32_t nret, target_ulong rets)
 280 {
 281     target_ulong parameter = rtas_ld(args, 0);
 282     target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
 283
 284     switch (parameter) {
 285     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
 286     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
 287     case RTAS_SYSPARM_UUID:
 288         ret = RTAS_OUT_NOT_AUTHORIZED;
 289         break;
 290     }
 291
 292     rtas_st(rets, 0, ret);
 293 }
 294
 295 static void rtas_ibm_os_term(PowerPCCPU *cpu,
 296                             SpaprMachineState *spapr,
 297                             uint32_t token, uint32_t nargs,
 298                             target_ulong args,
 299                             uint32_t nret, target_ulong rets)
 300 {
 301     qemu_system_guest_panicked(NULL);
 302
 303     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 304 }
 305
 306 static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
 307                                  uint32_t token, uint32_t nargs,
 308                                  target_ulong args, uint32_t nret,
 309                                  target_ulong rets)
 310 {
 311     int32_t power_domain;
 312
 313     if (nargs != 2 || nret != 2) {
 314         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 315         return;
 316     }
 317
 318     /* we currently only use a single, "live insert" powerdomain for
 319      * hotplugged/dlpar'd resources, so the power is always live/full (100)
 320      */
 321     power_domain = rtas_ld(args, 0);
 322     if (power_domain != -1) {
 323         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 324         return;
 325     }
 326
 327     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 328     rtas_st(rets, 1, 100);
 329 }
 330
 331 static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
 332                                   uint32_t token, uint32_t nargs,
 333                                   target_ulong args, uint32_t nret,
 334                                   target_ulong rets)
 335 {
 336     int32_t power_domain;
 337
 338     if (nargs != 1 || nret != 2) {
 339         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 340         return;
 341     }
 342
 343     /* we currently only use a single, "live insert" powerdomain for
 344      * hotplugged/dlpar'd resources, so the power is always live/full (100)
 345      */
 346     power_domain = rtas_ld(args, 0);
 347     if (power_domain != -1) {
 348         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 349         return;
 350     }
 351
 352     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 353     rtas_st(rets, 1, 100);
 354 }
 355
 356 static struct rtas_call {
 357     const char *name;
 358     spapr_rtas_fn fn;
 359 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
 360
 361 target_ulong spapr_rtas_call(PowerPCCPU *cpu, SpaprMachineState *spapr,
 362                              uint32_t token, uint32_t nargs, target_ulong args,
 363                              uint32_t nret, target_ulong rets)
 364 {
 365     if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
 366         struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
 367
 368         if (call->fn) {
 369             call->fn(cpu, spapr, token, nargs, args, nret, rets);
 370             return H_SUCCESS;
 371         }
 372     }
 373
 374     /* HACK: Some Linux early debug code uses RTAS display-character,
 375      * but assumes the token value is 0xa (which it is on some real
 376      * machines) without looking it up in the device tree.  This
 377      * special case makes this work */
 378     if (token == 0xa) {
 379         rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
 380         return H_SUCCESS;
 381     }
 382
 383     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 384     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 385     return H_PARAMETER;
 386 }
 387
 388 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
 389                          uint32_t nret, uint64_t rets)
 390 {
 391     int token;
 392
 393     for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
 394         if (strcmp(cmd, rtas_table[token].name) == 0) {
 395             SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
 396             PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 397
 398             rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
 399                                  nargs, args, nret, rets);
 400             return H_SUCCESS;
 401         }
 402     }
 403     return H_PARAMETER;
 404 }
 405
 406 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
 407 {
 408     assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
 409
 410     token -= RTAS_TOKEN_BASE;
 411
 412     assert(!name || !rtas_table[token].name);
 413
 414     rtas_table[token].name = name;
 415     rtas_table[token].fn = fn;
 416 }
 417
 418 void spapr_dt_rtas_tokens(void *fdt, int rtas)
 419 {
 420     int i;
 421
 422     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
 423         struct rtas_call *call = &rtas_table[i];
 424
 425         if (!call->name) {
 426             continue;
 427         }
 428
 429         _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
 430     }
 431 }
 432
 433 void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr)
 434 {
 435     int rtas_node;
 436     int ret;
 437
 438     /* Copy RTAS blob into guest RAM */
 439     cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size);
 440
 441     ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size);
 442     if (ret < 0) {
 443         error_report("Couldn't add RTAS reserve entry: %s",
 444                      fdt_strerror(ret));
 445         exit(1);
 446     }
 447
 448     /* Update the device tree with the blob's location */
 449     rtas_node = fdt_path_offset(fdt, "/rtas");
 450     assert(rtas_node >= 0);
 451
 452     ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr);
 453     if (ret < 0) {
 454         error_report("Couldn't add linux,rtas-base property: %s",
 455                      fdt_strerror(ret));
 456         exit(1);
 457     }
 458
 459     ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr);
 460     if (ret < 0) {
 461         error_report("Couldn't add linux,rtas-entry property: %s",
 462                      fdt_strerror(ret));
 463         exit(1);
 464     }
 465
 466     ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size);
 467     if (ret < 0) {
 468         error_report("Couldn't add rtas-size property: %s",
 469                      fdt_strerror(ret));
 470         exit(1);
 471     }
 472 }
 473
 474 static void core_rtas_register_types(void)
 475 {
 476     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
 477                         rtas_display_character);
 478     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
 479     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
 480                         rtas_system_reboot);
 481     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
 482                         rtas_query_cpu_stopped_state);
 483     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
 484     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
 485     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
 486                         "ibm,get-system-parameter",
 487                         rtas_ibm_get_system_parameter);
 488     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
 489                         "ibm,set-system-parameter",
 490                         rtas_ibm_set_system_parameter);
 491     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
 492                         rtas_ibm_os_term);
 493     spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
 494                         rtas_set_power_level);
 495     spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
 496                         rtas_get_power_level);
 497 }
 498
 499 type_init(core_rtas_register_types)