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, ¶m_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) 499