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 "hw/qdev.h"
  33 #include "sysemu/device_tree.h"
  34 #include "sysemu/cpus.h"
  35 #include "sysemu/kvm.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/ppc.h"
  41 #include "qapi-event.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
  50 static void rtas_display_character(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  51                                    uint32_t token, uint32_t nargs,
  52                                    target_ulong args,
  53                                    uint32_t nret, target_ulong rets)
  54 {
  55     uint8_t c = rtas_ld(args, 0);
  56     VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
  57
  58     if (!sdev) {
  59         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  60     } else {
  61         vty_putchars(sdev, &c, sizeof(c));
  62         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  63     }
  64 }
  65
  66 static void rtas_power_off(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  67                            uint32_t token, uint32_t nargs, target_ulong args,
  68                            uint32_t nret, target_ulong rets)
  69 {
  70     if (nargs != 2 || nret != 1) {
  71         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  72         return;
  73     }
  74     qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
  75     cpu_stop_current();
  76     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  77 }
  78
  79 static void rtas_system_reboot(PowerPCCPU *cpu, sPAPRMachineState *spapr,
  80                                uint32_t token, uint32_t nargs,
  81                                target_ulong args,
  82                                uint32_t nret, target_ulong rets)
  83 {
  84     if (nargs != 0 || nret != 1) {
  85         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  86         return;
  87     }
  88     qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
  89     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  90 }
  91
  92 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
  93                                          sPAPRMachineState *spapr,
  94                                          uint32_t token, uint32_t nargs,
  95                                          target_ulong args,
  96                                          uint32_t nret, target_ulong rets)
  97 {
  98     target_ulong id;
  99     PowerPCCPU *cpu;
 100
 101     if (nargs != 1 || nret != 2) {
 102         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 103         return;
 104     }
 105
 106     id = rtas_ld(args, 0);
 107     cpu = spapr_find_cpu(id);
 108     if (cpu != NULL) {
 109         if (CPU(cpu)->halted) {
 110             rtas_st(rets, 1, 0);
 111         } else {
 112             rtas_st(rets, 1, 2);
 113         }
 114
 115         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 116         return;
 117     }
 118
 119     /* Didn't find a matching cpu */
 120     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 121 }
 122
 123 /*
 124  * Set the timebase offset of the CPU to that of first CPU.
 125  * This helps hotplugged CPU to have the correct timebase offset.
 126  */
 127 static void spapr_cpu_update_tb_offset(PowerPCCPU *cpu)
 128 {
 129     PowerPCCPU *fcpu = POWERPC_CPU(first_cpu);
 130
 131     cpu->env.tb_env->tb_offset = fcpu->env.tb_env->tb_offset;
 132 }
 133
 134 static void spapr_cpu_set_endianness(PowerPCCPU *cpu)
 135 {
 136     PowerPCCPU *fcpu = POWERPC_CPU(first_cpu);
 137     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(fcpu);
 138
 139     if (!pcc->interrupts_big_endian(fcpu)) {
 140         cpu->env.spr[SPR_LPCR] |= LPCR_ILE;
 141     }
 142 }
 143
 144 static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPRMachineState *spapr,
 145                            uint32_t token, uint32_t nargs,
 146                            target_ulong args,
 147                            uint32_t nret, target_ulong rets)
 148 {
 149     target_ulong id, start, r3;
 150     PowerPCCPU *cpu;
 151
 152     if (nargs != 3 || nret != 1) {
 153         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 154         return;
 155     }
 156
 157     id = rtas_ld(args, 0);
 158     start = rtas_ld(args, 1);
 159     r3 = rtas_ld(args, 2);
 160
 161     cpu = spapr_find_cpu(id);
 162     if (cpu != NULL) {
 163         CPUState *cs = CPU(cpu);
 164         CPUPPCState *env = &cpu->env;
 165
 166         if (!cs->halted) {
 167             rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 168             return;
 169         }
 170
 171         /* This will make sure qemu state is up to date with kvm, and
 172          * mark it dirty so our changes get flushed back before the
 173          * new cpu enters */
 174         kvm_cpu_synchronize_state(cs);
 175
 176         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 177         env->nip = start;
 178         env->gpr[3] = r3;
 179         cs->halted = 0;
 180         spapr_cpu_set_endianness(cpu);
 181         spapr_cpu_update_tb_offset(cpu);
 182
 183         qemu_cpu_kick(cs);
 184
 185         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 186         return;
 187     }
 188
 189     /* Didn't find a matching cpu */
 190     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 191 }
 192
 193 static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 194                            uint32_t token, uint32_t nargs,
 195                            target_ulong args,
 196                            uint32_t nret, target_ulong rets)
 197 {
 198     CPUState *cs = CPU(cpu);
 199     CPUPPCState *env = &cpu->env;
 200
 201     cs->halted = 1;
 202     qemu_cpu_kick(cs);
 203     /*
 204      * While stopping a CPU, the guest calls H_CPPR which
 205      * effectively disables interrupts on XICS level.
 206      * However decrementer interrupts in TCG can still
 207      * wake the CPU up so here we disable interrupts in MSR
 208      * as well.
 209      * As rtas_start_cpu() resets the whole MSR anyway, there is
 210      * no need to bother with specific bits, we just clear it.
 211      */
 212     env->msr = 0;
 213 }
 214
 215 static inline int sysparm_st(target_ulong addr, target_ulong len,
 216                              const void *val, uint16_t vallen)
 217 {
 218     hwaddr phys = ppc64_phys_to_real(addr);
 219
 220     if (len < 2) {
 221         return RTAS_OUT_SYSPARM_PARAM_ERROR;
 222     }
 223     stw_be_phys(&address_space_memory, phys, vallen);
 224     cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
 225     return RTAS_OUT_SUCCESS;
 226 }
 227
 228 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
 229                                           sPAPRMachineState *spapr,
 230                                           uint32_t token, uint32_t nargs,
 231                                           target_ulong args,
 232                                           uint32_t nret, target_ulong rets)
 233 {
 234     target_ulong parameter = rtas_ld(args, 0);
 235     target_ulong buffer = rtas_ld(args, 1);
 236     target_ulong length = rtas_ld(args, 2);
 237     target_ulong ret;
 238
 239     switch (parameter) {
 240     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
 241         char *param_val = g_strdup_printf("MaxEntCap=%d,"
 242                                           "DesMem=%llu,"
 243                                           "DesProcs=%d,"
 244                                           "MaxPlatProcs=%d",
 245                                           max_cpus,
 246                                           current_machine->ram_size / M_BYTE,
 247                                           smp_cpus,
 248                                           max_cpus);
 249         ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
 250         g_free(param_val);
 251         break;
 252     }
 253     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
 254         uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
 255
 256         ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
 257         break;
 258     }
 259     case RTAS_SYSPARM_UUID:
 260         ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid,
 261                          (qemu_uuid_set ? 16 : 0));
 262         break;
 263     default:
 264         ret = RTAS_OUT_NOT_SUPPORTED;
 265     }
 266
 267     rtas_st(rets, 0, ret);
 268 }
 269
 270 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
 271                                           sPAPRMachineState *spapr,
 272                                           uint32_t token, uint32_t nargs,
 273                                           target_ulong args,
 274                                           uint32_t nret, target_ulong rets)
 275 {
 276     target_ulong parameter = rtas_ld(args, 0);
 277     target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
 278
 279     switch (parameter) {
 280     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
 281     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
 282     case RTAS_SYSPARM_UUID:
 283         ret = RTAS_OUT_NOT_AUTHORIZED;
 284         break;
 285     }
 286
 287     rtas_st(rets, 0, ret);
 288 }
 289
 290 static void rtas_ibm_os_term(PowerPCCPU *cpu,
 291                             sPAPRMachineState *spapr,
 292                             uint32_t token, uint32_t nargs,
 293                             target_ulong args,
 294                             uint32_t nret, target_ulong rets)
 295 {
 296     qemu_system_guest_panicked(NULL);
 297
 298     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 299 }
 300
 301 static void rtas_set_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 302                                  uint32_t token, uint32_t nargs,
 303                                  target_ulong args, uint32_t nret,
 304                                  target_ulong rets)
 305 {
 306     int32_t power_domain;
 307
 308     if (nargs != 2 || nret != 2) {
 309         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 310         return;
 311     }
 312
 313     /* we currently only use a single, "live insert" powerdomain for
 314      * hotplugged/dlpar'd resources, so the power is always live/full (100)
 315      */
 316     power_domain = rtas_ld(args, 0);
 317     if (power_domain != -1) {
 318         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 319         return;
 320     }
 321
 322     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 323     rtas_st(rets, 1, 100);
 324 }
 325
 326 static void rtas_get_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 327                                   uint32_t token, uint32_t nargs,
 328                                   target_ulong args, uint32_t nret,
 329                                   target_ulong rets)
 330 {
 331     int32_t power_domain;
 332
 333     if (nargs != 1 || nret != 2) {
 334         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 335         return;
 336     }
 337
 338     /* we currently only use a single, "live insert" powerdomain for
 339      * hotplugged/dlpar'd resources, so the power is always live/full (100)
 340      */
 341     power_domain = rtas_ld(args, 0);
 342     if (power_domain != -1) {
 343         rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
 344         return;
 345     }
 346
 347     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 348     rtas_st(rets, 1, 100);
 349 }
 350
 351 static struct rtas_call {
 352     const char *name;
 353     spapr_rtas_fn fn;
 354 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
 355
 356 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 357                              uint32_t token, uint32_t nargs, target_ulong args,
 358                              uint32_t nret, target_ulong rets)
 359 {
 360     if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
 361         struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
 362
 363         if (call->fn) {
 364             call->fn(cpu, spapr, token, nargs, args, nret, rets);
 365             return H_SUCCESS;
 366         }
 367     }
 368
 369     /* HACK: Some Linux early debug code uses RTAS display-character,
 370      * but assumes the token value is 0xa (which it is on some real
 371      * machines) without looking it up in the device tree.  This
 372      * special case makes this work */
 373     if (token == 0xa) {
 374         rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
 375         return H_SUCCESS;
 376     }
 377
 378     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 379     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 380     return H_PARAMETER;
 381 }
 382
 383 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
 384                          uint32_t nret, uint64_t rets)
 385 {
 386     int token;
 387
 388     for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
 389         if (strcmp(cmd, rtas_table[token].name) == 0) {
 390             sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
 391             PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
 392
 393             rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
 394                                  nargs, args, nret, rets);
 395             return H_SUCCESS;
 396         }
 397     }
 398     return H_PARAMETER;
 399 }
 400
 401 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
 402 {
 403     assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
 404
 405     token -= RTAS_TOKEN_BASE;
 406
 407     assert(!rtas_table[token].name);
 408
 409     rtas_table[token].name = name;
 410     rtas_table[token].fn = fn;
 411 }
 412
 413 void spapr_dt_rtas_tokens(void *fdt, int rtas)
 414 {
 415     int i;
 416
 417     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
 418         struct rtas_call *call = &rtas_table[i];
 419
 420         if (!call->name) {
 421             continue;
 422         }
 423
 424         _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
 425     }
 426 }
 427
 428 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr)
 429 {
 430     int rtas_node;
 431     int ret;
 432
 433     /* Copy RTAS blob into guest RAM */
 434     cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size);
 435
 436     ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size);
 437     if (ret < 0) {
 438         error_report("Couldn't add RTAS reserve entry: %s",
 439                      fdt_strerror(ret));
 440         exit(1);
 441     }
 442
 443     /* Update the device tree with the blob's location */
 444     rtas_node = fdt_path_offset(fdt, "/rtas");
 445     assert(rtas_node >= 0);
 446
 447     ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr);
 448     if (ret < 0) {
 449         error_report("Couldn't add linux,rtas-base property: %s",
 450                      fdt_strerror(ret));
 451         exit(1);
 452     }
 453
 454     ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr);
 455     if (ret < 0) {
 456         error_report("Couldn't add linux,rtas-entry property: %s",
 457                      fdt_strerror(ret));
 458         exit(1);
 459     }
 460
 461     ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size);
 462     if (ret < 0) {
 463         error_report("Couldn't add rtas-size property: %s",
 464                      fdt_strerror(ret));
 465         exit(1);
 466     }
 467 }
 468
 469 static void core_rtas_register_types(void)
 470 {
 471     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
 472                         rtas_display_character);
 473     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
 474     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
 475                         rtas_system_reboot);
 476     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
 477                         rtas_query_cpu_stopped_state);
 478     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
 479     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
 480     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
 481                         "ibm,get-system-parameter",
 482                         rtas_ibm_get_system_parameter);
 483     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
 484                         "ibm,set-system-parameter",
 485                         rtas_ibm_set_system_parameter);
 486     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
 487                         rtas_ibm_os_term);
 488     spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
 489                         rtas_set_power_level);
 490     spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
 491                         rtas_get_power_level);
 492 }
 493
 494 type_init(core_rtas_register_types)