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