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 inline int sysparm_st(target_ulong addr, target_ulong len, 221 const void *val, uint16_t vallen) 222 { 223 hwaddr phys = ppc64_phys_to_real(addr); 224 225 if (len < 2) { 226 return RTAS_OUT_SYSPARM_PARAM_ERROR; 227 } 228 stw_be_phys(&address_space_memory, phys, vallen); 229 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen)); 230 return RTAS_OUT_SUCCESS; 231 } 232 233 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 234 SpaprMachineState *spapr, 235 uint32_t token, uint32_t nargs, 236 target_ulong args, 237 uint32_t nret, target_ulong rets) 238 { 239 MachineState *ms = MACHINE(qdev_get_machine()); 240 unsigned int max_cpus = ms->smp.max_cpus; 241 target_ulong parameter = rtas_ld(args, 0); 242 target_ulong buffer = rtas_ld(args, 1); 243 target_ulong length = rtas_ld(args, 2); 244 target_ulong ret; 245 246 switch (parameter) { 247 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: { 248 char *param_val = g_strdup_printf("MaxEntCap=%d," 249 "DesMem=%" PRIu64 "," 250 "DesProcs=%d," 251 "MaxPlatProcs=%d", 252 max_cpus, 253 current_machine->ram_size / MiB, 254 ms->smp.cpus, 255 max_cpus); 256 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1); 257 g_free(param_val); 258 break; 259 } 260 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: { 261 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED; 262 263 ret = sysparm_st(buffer, length, ¶m_val, sizeof(param_val)); 264 break; 265 } 266 case RTAS_SYSPARM_UUID: 267 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid, 268 (qemu_uuid_set ? 16 : 0)); 269 break; 270 default: 271 ret = RTAS_OUT_NOT_SUPPORTED; 272 } 273 274 rtas_st(rets, 0, ret); 275 } 276 277 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 278 SpaprMachineState *spapr, 279 uint32_t token, uint32_t nargs, 280 target_ulong args, 281 uint32_t nret, target_ulong rets) 282 { 283 target_ulong parameter = rtas_ld(args, 0); 284 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 285 286 switch (parameter) { 287 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: 288 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: 289 case RTAS_SYSPARM_UUID: 290 ret = RTAS_OUT_NOT_AUTHORIZED; 291 break; 292 } 293 294 rtas_st(rets, 0, ret); 295 } 296 297 static void rtas_ibm_os_term(PowerPCCPU *cpu, 298 SpaprMachineState *spapr, 299 uint32_t token, uint32_t nargs, 300 target_ulong args, 301 uint32_t nret, target_ulong rets) 302 { 303 qemu_system_guest_panicked(NULL); 304 305 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 306 } 307 308 static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr, 309 uint32_t token, uint32_t nargs, 310 target_ulong args, uint32_t nret, 311 target_ulong rets) 312 { 313 int32_t power_domain; 314 315 if (nargs != 2 || nret != 2) { 316 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 317 return; 318 } 319 320 /* we currently only use a single, "live insert" powerdomain for 321 * hotplugged/dlpar'd resources, so the power is always live/full (100) 322 */ 323 power_domain = rtas_ld(args, 0); 324 if (power_domain != -1) { 325 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 326 return; 327 } 328 329 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 330 rtas_st(rets, 1, 100); 331 } 332 333 static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr, 334 uint32_t token, uint32_t nargs, 335 target_ulong args, uint32_t nret, 336 target_ulong rets) 337 { 338 int32_t power_domain; 339 340 if (nargs != 1 || nret != 2) { 341 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 342 return; 343 } 344 345 /* we currently only use a single, "live insert" powerdomain for 346 * hotplugged/dlpar'd resources, so the power is always live/full (100) 347 */ 348 power_domain = rtas_ld(args, 0); 349 if (power_domain != -1) { 350 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 351 return; 352 } 353 354 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 355 rtas_st(rets, 1, 100); 356 } 357 358 static struct rtas_call { 359 const char *name; 360 spapr_rtas_fn fn; 361 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 362 363 target_ulong spapr_rtas_call(PowerPCCPU *cpu, SpaprMachineState *spapr, 364 uint32_t token, uint32_t nargs, target_ulong args, 365 uint32_t nret, target_ulong rets) 366 { 367 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 368 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 369 370 if (call->fn) { 371 call->fn(cpu, spapr, token, nargs, args, nret, rets); 372 return H_SUCCESS; 373 } 374 } 375 376 /* HACK: Some Linux early debug code uses RTAS display-character, 377 * but assumes the token value is 0xa (which it is on some real 378 * machines) without looking it up in the device tree. This 379 * special case makes this work */ 380 if (token == 0xa) { 381 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 382 return H_SUCCESS; 383 } 384 385 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 386 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 387 return H_PARAMETER; 388 } 389 390 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args, 391 uint32_t nret, uint64_t rets) 392 { 393 int token; 394 395 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) { 396 if (strcmp(cmd, rtas_table[token].name) == 0) { 397 SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 398 PowerPCCPU *cpu = POWERPC_CPU(first_cpu); 399 400 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE, 401 nargs, args, nret, rets); 402 return H_SUCCESS; 403 } 404 } 405 return H_PARAMETER; 406 } 407 408 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 409 { 410 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)); 411 412 token -= RTAS_TOKEN_BASE; 413 414 assert(!name || !rtas_table[token].name); 415 416 rtas_table[token].name = name; 417 rtas_table[token].fn = fn; 418 } 419 420 void spapr_dt_rtas_tokens(void *fdt, int rtas) 421 { 422 int i; 423 424 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 425 struct rtas_call *call = &rtas_table[i]; 426 427 if (!call->name) { 428 continue; 429 } 430 431 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE)); 432 } 433 } 434 435 void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr) 436 { 437 int rtas_node; 438 int ret; 439 440 /* Copy RTAS blob into guest RAM */ 441 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size); 442 443 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size); 444 if (ret < 0) { 445 error_report("Couldn't add RTAS reserve entry: %s", 446 fdt_strerror(ret)); 447 exit(1); 448 } 449 450 /* Update the device tree with the blob's location */ 451 rtas_node = fdt_path_offset(fdt, "/rtas"); 452 assert(rtas_node >= 0); 453 454 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr); 455 if (ret < 0) { 456 error_report("Couldn't add linux,rtas-base property: %s", 457 fdt_strerror(ret)); 458 exit(1); 459 } 460 461 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr); 462 if (ret < 0) { 463 error_report("Couldn't add linux,rtas-entry property: %s", 464 fdt_strerror(ret)); 465 exit(1); 466 } 467 468 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size); 469 if (ret < 0) { 470 error_report("Couldn't add rtas-size property: %s", 471 fdt_strerror(ret)); 472 exit(1); 473 } 474 } 475 476 static void core_rtas_register_types(void) 477 { 478 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 479 rtas_display_character); 480 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 481 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 482 rtas_system_reboot); 483 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 484 rtas_query_cpu_stopped_state); 485 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 486 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 487 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 488 "ibm,get-system-parameter", 489 rtas_ibm_get_system_parameter); 490 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 491 "ibm,set-system-parameter", 492 rtas_ibm_set_system_parameter); 493 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term", 494 rtas_ibm_os_term); 495 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level", 496 rtas_set_power_level); 497 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", 498 rtas_get_power_level); 499 } 500 501 type_init(core_rtas_register_types) 502