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 28 #include "qemu/osdep.h" 29 #include "cpu.h" 30 #include "qemu/log.h" 31 #include "qemu/error-report.h" 32 #include "sysemu/sysemu.h" 33 #include "sysemu/device_tree.h" 34 #include "sysemu/cpus.h" 35 #include "sysemu/hw_accel.h" 36 #include "sysemu/runstate.h" 37 #include "kvm_ppc.h" 38 39 #include "hw/ppc/spapr.h" 40 #include "hw/ppc/spapr_vio.h" 41 #include "hw/ppc/spapr_rtas.h" 42 #include "hw/ppc/spapr_cpu_core.h" 43 #include "hw/ppc/ppc.h" 44 #include "hw/boards.h" 45 46 #include <libfdt.h> 47 #include "hw/ppc/spapr_drc.h" 48 #include "qemu/cutils.h" 49 #include "trace.h" 50 #include "hw/ppc/fdt.h" 51 #include "target/ppc/mmu-hash64.h" 52 #include "target/ppc/mmu-book3s-v3.h" 53 54 static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spapr, 55 uint32_t token, uint32_t nargs, 56 target_ulong args, 57 uint32_t nret, target_ulong rets) 58 { 59 uint8_t c = rtas_ld(args, 0); 60 SpaprVioDevice *sdev = vty_lookup(spapr, 0); 61 62 if (!sdev) { 63 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 64 } else { 65 vty_putchars(sdev, &c, sizeof(c)); 66 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 67 } 68 } 69 70 static void rtas_power_off(PowerPCCPU *cpu, SpaprMachineState *spapr, 71 uint32_t token, uint32_t nargs, target_ulong args, 72 uint32_t nret, target_ulong rets) 73 { 74 if (nargs != 2 || nret != 1) { 75 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 76 return; 77 } 78 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 79 cpu_stop_current(); 80 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 81 } 82 83 static void rtas_system_reboot(PowerPCCPU *cpu, SpaprMachineState *spapr, 84 uint32_t token, uint32_t nargs, 85 target_ulong args, 86 uint32_t nret, target_ulong rets) 87 { 88 if (nargs != 0 || nret != 1) { 89 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 90 return; 91 } 92 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 93 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 94 } 95 96 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_, 97 SpaprMachineState *spapr, 98 uint32_t token, uint32_t nargs, 99 target_ulong args, 100 uint32_t nret, target_ulong rets) 101 { 102 target_ulong id; 103 PowerPCCPU *cpu; 104 105 if (nargs != 1 || nret != 2) { 106 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 107 return; 108 } 109 110 id = rtas_ld(args, 0); 111 cpu = spapr_find_cpu(id); 112 if (cpu != NULL) { 113 if (CPU(cpu)->halted) { 114 rtas_st(rets, 1, 0); 115 } else { 116 rtas_st(rets, 1, 2); 117 } 118 119 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 120 return; 121 } 122 123 /* Didn't find a matching cpu */ 124 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 125 } 126 127 static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr, 128 uint32_t token, uint32_t nargs, 129 target_ulong args, 130 uint32_t nret, target_ulong rets) 131 { 132 target_ulong id, start, r3; 133 PowerPCCPU *newcpu; 134 CPUPPCState *env; 135 PowerPCCPUClass *pcc; 136 target_ulong lpcr; 137 138 if (nargs != 3 || nret != 1) { 139 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 140 return; 141 } 142 143 id = rtas_ld(args, 0); 144 start = rtas_ld(args, 1); 145 r3 = rtas_ld(args, 2); 146 147 newcpu = spapr_find_cpu(id); 148 if (!newcpu) { 149 /* Didn't find a matching cpu */ 150 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 151 return; 152 } 153 154 env = &newcpu->env; 155 pcc = POWERPC_CPU_GET_CLASS(newcpu); 156 157 if (!CPU(newcpu)->halted) { 158 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 159 return; 160 } 161 162 cpu_synchronize_state(CPU(newcpu)); 163 164 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 165 166 /* Enable Power-saving mode Exit Cause exceptions for the new CPU */ 167 lpcr = env->spr[SPR_LPCR]; 168 if (!pcc->interrupts_big_endian(callcpu)) { 169 lpcr |= LPCR_ILE; 170 } 171 if (env->mmu_model == POWERPC_MMU_3_00) { 172 /* 173 * New cpus are expected to start in the same radix/hash mode 174 * as the existing CPUs 175 */ 176 if (ppc64_v3_radix(callcpu)) { 177 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR; 178 } else { 179 lpcr &= ~(LPCR_UPRT | LPCR_GTSE | LPCR_HR); 180 } 181 env->spr[SPR_PSSCR] &= ~PSSCR_EC; 182 } 183 ppc_store_lpcr(newcpu, lpcr); 184 185 /* 186 * Set the timebase offset of the new CPU to that of the invoking 187 * CPU. This helps hotplugged CPU to have the correct timebase 188 * offset. 189 */ 190 newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset; 191 192 spapr_cpu_set_entry_state(newcpu, start, r3); 193 194 qemu_cpu_kick(CPU(newcpu)); 195 196 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 197 } 198 199 static void rtas_stop_self(PowerPCCPU *cpu, SpaprMachineState *spapr, 200 uint32_t token, uint32_t nargs, 201 target_ulong args, 202 uint32_t nret, target_ulong rets) 203 { 204 CPUState *cs = CPU(cpu); 205 CPUPPCState *env = &cpu->env; 206 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 207 208 /* Disable Power-saving mode Exit Cause exceptions for the CPU. 209 * This could deliver an interrupt on a dying CPU and crash the 210 * guest. 211 * For the same reason, set PSSCR_EC. 212 */ 213 ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm); 214 env->spr[SPR_PSSCR] |= PSSCR_EC; 215 cs->halted = 1; 216 kvmppc_set_reg_ppc_online(cpu, 0); 217 qemu_cpu_kick(cs); 218 } 219 220 static void rtas_ibm_suspend_me(PowerPCCPU *cpu, SpaprMachineState *spapr, 221 uint32_t token, uint32_t nargs, 222 target_ulong args, 223 uint32_t nret, target_ulong rets) 224 { 225 CPUState *cs; 226 227 if (nargs != 0 || nret != 1) { 228 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 229 return; 230 } 231 232 CPU_FOREACH(cs) { 233 PowerPCCPU *c = POWERPC_CPU(cs); 234 CPUPPCState *e = &c->env; 235 if (c == cpu) { 236 continue; 237 } 238 239 /* See h_join */ 240 if (!cs->halted || (e->msr & (1ULL << MSR_EE))) { 241 rtas_st(rets, 0, H_MULTI_THREADS_ACTIVE); 242 return; 243 } 244 } 245 246 qemu_system_suspend_request(); 247 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 248 } 249 250 static inline int sysparm_st(target_ulong addr, target_ulong len, 251 const void *val, uint16_t vallen) 252 { 253 hwaddr phys = ppc64_phys_to_real(addr); 254 255 if (len < 2) { 256 return RTAS_OUT_SYSPARM_PARAM_ERROR; 257 } 258 stw_be_phys(&address_space_memory, phys, vallen); 259 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen)); 260 return RTAS_OUT_SUCCESS; 261 } 262 263 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 264 SpaprMachineState *spapr, 265 uint32_t token, uint32_t nargs, 266 target_ulong args, 267 uint32_t nret, target_ulong rets) 268 { 269 MachineState *ms = MACHINE(qdev_get_machine()); 270 unsigned int max_cpus = ms->smp.max_cpus; 271 target_ulong parameter = rtas_ld(args, 0); 272 target_ulong buffer = rtas_ld(args, 1); 273 target_ulong length = rtas_ld(args, 2); 274 target_ulong ret; 275 276 switch (parameter) { 277 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: { 278 char *param_val = g_strdup_printf("MaxEntCap=%d," 279 "DesMem=%" PRIu64 "," 280 "DesProcs=%d," 281 "MaxPlatProcs=%d", 282 max_cpus, 283 current_machine->ram_size / MiB, 284 ms->smp.cpus, 285 max_cpus); 286 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1); 287 g_free(param_val); 288 break; 289 } 290 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: { 291 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED; 292 293 ret = sysparm_st(buffer, length, ¶m_val, sizeof(param_val)); 294 break; 295 } 296 case RTAS_SYSPARM_UUID: 297 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid, 298 (qemu_uuid_set ? 16 : 0)); 299 break; 300 default: 301 ret = RTAS_OUT_NOT_SUPPORTED; 302 } 303 304 rtas_st(rets, 0, ret); 305 } 306 307 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 308 SpaprMachineState *spapr, 309 uint32_t token, uint32_t nargs, 310 target_ulong args, 311 uint32_t nret, target_ulong rets) 312 { 313 target_ulong parameter = rtas_ld(args, 0); 314 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 315 316 switch (parameter) { 317 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: 318 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: 319 case RTAS_SYSPARM_UUID: 320 ret = RTAS_OUT_NOT_AUTHORIZED; 321 break; 322 } 323 324 rtas_st(rets, 0, ret); 325 } 326 327 static void rtas_ibm_os_term(PowerPCCPU *cpu, 328 SpaprMachineState *spapr, 329 uint32_t token, uint32_t nargs, 330 target_ulong args, 331 uint32_t nret, target_ulong rets) 332 { 333 qemu_system_guest_panicked(NULL); 334 335 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 336 } 337 338 static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr, 339 uint32_t token, uint32_t nargs, 340 target_ulong args, uint32_t nret, 341 target_ulong rets) 342 { 343 int32_t power_domain; 344 345 if (nargs != 2 || nret != 2) { 346 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 347 return; 348 } 349 350 /* we currently only use a single, "live insert" powerdomain for 351 * hotplugged/dlpar'd resources, so the power is always live/full (100) 352 */ 353 power_domain = rtas_ld(args, 0); 354 if (power_domain != -1) { 355 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 356 return; 357 } 358 359 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 360 rtas_st(rets, 1, 100); 361 } 362 363 static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr, 364 uint32_t token, uint32_t nargs, 365 target_ulong args, uint32_t nret, 366 target_ulong rets) 367 { 368 int32_t power_domain; 369 370 if (nargs != 1 || nret != 2) { 371 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 372 return; 373 } 374 375 /* we currently only use a single, "live insert" powerdomain for 376 * hotplugged/dlpar'd resources, so the power is always live/full (100) 377 */ 378 power_domain = rtas_ld(args, 0); 379 if (power_domain != -1) { 380 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 381 return; 382 } 383 384 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 385 rtas_st(rets, 1, 100); 386 } 387 388 static struct rtas_call { 389 const char *name; 390 spapr_rtas_fn fn; 391 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 392 393 target_ulong spapr_rtas_call(PowerPCCPU *cpu, SpaprMachineState *spapr, 394 uint32_t token, uint32_t nargs, target_ulong args, 395 uint32_t nret, target_ulong rets) 396 { 397 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 398 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 399 400 if (call->fn) { 401 call->fn(cpu, spapr, token, nargs, args, nret, rets); 402 return H_SUCCESS; 403 } 404 } 405 406 /* HACK: Some Linux early debug code uses RTAS display-character, 407 * but assumes the token value is 0xa (which it is on some real 408 * machines) without looking it up in the device tree. This 409 * special case makes this work */ 410 if (token == 0xa) { 411 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 412 return H_SUCCESS; 413 } 414 415 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 416 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 417 return H_PARAMETER; 418 } 419 420 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args, 421 uint32_t nret, uint64_t rets) 422 { 423 int token; 424 425 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) { 426 if (strcmp(cmd, rtas_table[token].name) == 0) { 427 SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 428 PowerPCCPU *cpu = POWERPC_CPU(first_cpu); 429 430 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE, 431 nargs, args, nret, rets); 432 return H_SUCCESS; 433 } 434 } 435 return H_PARAMETER; 436 } 437 438 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 439 { 440 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)); 441 442 token -= RTAS_TOKEN_BASE; 443 444 assert(!name || !rtas_table[token].name); 445 446 rtas_table[token].name = name; 447 rtas_table[token].fn = fn; 448 } 449 450 void spapr_dt_rtas_tokens(void *fdt, int rtas) 451 { 452 int i; 453 454 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 455 struct rtas_call *call = &rtas_table[i]; 456 457 if (!call->name) { 458 continue; 459 } 460 461 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE)); 462 } 463 } 464 465 void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr) 466 { 467 int rtas_node; 468 int ret; 469 470 /* Copy RTAS blob into guest RAM */ 471 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size); 472 473 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size); 474 if (ret < 0) { 475 error_report("Couldn't add RTAS reserve entry: %s", 476 fdt_strerror(ret)); 477 exit(1); 478 } 479 480 /* Update the device tree with the blob's location */ 481 rtas_node = fdt_path_offset(fdt, "/rtas"); 482 assert(rtas_node >= 0); 483 484 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr); 485 if (ret < 0) { 486 error_report("Couldn't add linux,rtas-base property: %s", 487 fdt_strerror(ret)); 488 exit(1); 489 } 490 491 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr); 492 if (ret < 0) { 493 error_report("Couldn't add linux,rtas-entry property: %s", 494 fdt_strerror(ret)); 495 exit(1); 496 } 497 498 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size); 499 if (ret < 0) { 500 error_report("Couldn't add rtas-size property: %s", 501 fdt_strerror(ret)); 502 exit(1); 503 } 504 } 505 506 static void core_rtas_register_types(void) 507 { 508 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 509 rtas_display_character); 510 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 511 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 512 rtas_system_reboot); 513 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 514 rtas_query_cpu_stopped_state); 515 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 516 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 517 spapr_rtas_register(RTAS_IBM_SUSPEND_ME, "ibm,suspend-me", 518 rtas_ibm_suspend_me); 519 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 520 "ibm,get-system-parameter", 521 rtas_ibm_get_system_parameter); 522 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 523 "ibm,set-system-parameter", 524 rtas_ibm_set_system_parameter); 525 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term", 526 rtas_ibm_os_term); 527 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level", 528 rtas_set_power_level); 529 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", 530 rtas_get_power_level); 531 } 532 533 type_init(core_rtas_register_types) 534