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 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 166 Error *local_err = NULL; 167 168 if (!cs->halted) { 169 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 170 return; 171 } 172 173 /* This will make sure qemu state is up to date with kvm, and 174 * mark it dirty so our changes get flushed back before the 175 * new cpu enters */ 176 kvm_cpu_synchronize_state(cs); 177 178 /* Set compatibility mode to match existing cpus */ 179 ppc_set_compat(cpu, POWERPC_CPU(first_cpu)->compat_pvr, &local_err); 180 if (local_err) { 181 error_report_err(local_err); 182 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 183 return; 184 } 185 186 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 187 188 /* Enable Power-saving mode Exit Cause exceptions for the new CPU */ 189 env->spr[SPR_LPCR] |= pcc->lpcr_pm; 190 191 env->nip = start; 192 env->gpr[3] = r3; 193 cs->halted = 0; 194 spapr_cpu_set_endianness(cpu); 195 spapr_cpu_update_tb_offset(cpu); 196 197 qemu_cpu_kick(cs); 198 199 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 200 return; 201 } 202 203 /* Didn't find a matching cpu */ 204 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 205 } 206 207 static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr, 208 uint32_t token, uint32_t nargs, 209 target_ulong args, 210 uint32_t nret, target_ulong rets) 211 { 212 CPUState *cs = CPU(cpu); 213 CPUPPCState *env = &cpu->env; 214 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 215 216 cs->halted = 1; 217 qemu_cpu_kick(cs); 218 219 /* Disable Power-saving mode Exit Cause exceptions for the CPU. 220 * This could deliver an interrupt on a dying CPU and crash the 221 * guest */ 222 env->spr[SPR_LPCR] &= ~pcc->lpcr_pm; 223 } 224 225 static inline int sysparm_st(target_ulong addr, target_ulong len, 226 const void *val, uint16_t vallen) 227 { 228 hwaddr phys = ppc64_phys_to_real(addr); 229 230 if (len < 2) { 231 return RTAS_OUT_SYSPARM_PARAM_ERROR; 232 } 233 stw_be_phys(&address_space_memory, phys, vallen); 234 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen)); 235 return RTAS_OUT_SUCCESS; 236 } 237 238 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 239 sPAPRMachineState *spapr, 240 uint32_t token, uint32_t nargs, 241 target_ulong args, 242 uint32_t nret, target_ulong rets) 243 { 244 target_ulong parameter = rtas_ld(args, 0); 245 target_ulong buffer = rtas_ld(args, 1); 246 target_ulong length = rtas_ld(args, 2); 247 target_ulong ret; 248 249 switch (parameter) { 250 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: { 251 char *param_val = g_strdup_printf("MaxEntCap=%d," 252 "DesMem=%llu," 253 "DesProcs=%d," 254 "MaxPlatProcs=%d", 255 max_cpus, 256 current_machine->ram_size / M_BYTE, 257 smp_cpus, 258 max_cpus); 259 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1); 260 g_free(param_val); 261 break; 262 } 263 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: { 264 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED; 265 266 ret = sysparm_st(buffer, length, ¶m_val, sizeof(param_val)); 267 break; 268 } 269 case RTAS_SYSPARM_UUID: 270 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid, 271 (qemu_uuid_set ? 16 : 0)); 272 break; 273 default: 274 ret = RTAS_OUT_NOT_SUPPORTED; 275 } 276 277 rtas_st(rets, 0, ret); 278 } 279 280 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 281 sPAPRMachineState *spapr, 282 uint32_t token, uint32_t nargs, 283 target_ulong args, 284 uint32_t nret, target_ulong rets) 285 { 286 target_ulong parameter = rtas_ld(args, 0); 287 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 288 289 switch (parameter) { 290 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: 291 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: 292 case RTAS_SYSPARM_UUID: 293 ret = RTAS_OUT_NOT_AUTHORIZED; 294 break; 295 } 296 297 rtas_st(rets, 0, ret); 298 } 299 300 static void rtas_ibm_os_term(PowerPCCPU *cpu, 301 sPAPRMachineState *spapr, 302 uint32_t token, uint32_t nargs, 303 target_ulong args, 304 uint32_t nret, target_ulong rets) 305 { 306 qemu_system_guest_panicked(NULL); 307 308 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 309 } 310 311 static void rtas_set_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 312 uint32_t token, uint32_t nargs, 313 target_ulong args, uint32_t nret, 314 target_ulong rets) 315 { 316 int32_t power_domain; 317 318 if (nargs != 2 || nret != 2) { 319 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 320 return; 321 } 322 323 /* we currently only use a single, "live insert" powerdomain for 324 * hotplugged/dlpar'd resources, so the power is always live/full (100) 325 */ 326 power_domain = rtas_ld(args, 0); 327 if (power_domain != -1) { 328 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 329 return; 330 } 331 332 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 333 rtas_st(rets, 1, 100); 334 } 335 336 static void rtas_get_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 337 uint32_t token, uint32_t nargs, 338 target_ulong args, uint32_t nret, 339 target_ulong rets) 340 { 341 int32_t power_domain; 342 343 if (nargs != 1 || nret != 2) { 344 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 345 return; 346 } 347 348 /* we currently only use a single, "live insert" powerdomain for 349 * hotplugged/dlpar'd resources, so the power is always live/full (100) 350 */ 351 power_domain = rtas_ld(args, 0); 352 if (power_domain != -1) { 353 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 354 return; 355 } 356 357 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 358 rtas_st(rets, 1, 100); 359 } 360 361 static struct rtas_call { 362 const char *name; 363 spapr_rtas_fn fn; 364 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 365 366 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *spapr, 367 uint32_t token, uint32_t nargs, target_ulong args, 368 uint32_t nret, target_ulong rets) 369 { 370 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 371 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 372 373 if (call->fn) { 374 call->fn(cpu, spapr, token, nargs, args, nret, rets); 375 return H_SUCCESS; 376 } 377 } 378 379 /* HACK: Some Linux early debug code uses RTAS display-character, 380 * but assumes the token value is 0xa (which it is on some real 381 * machines) without looking it up in the device tree. This 382 * special case makes this work */ 383 if (token == 0xa) { 384 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 385 return H_SUCCESS; 386 } 387 388 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 389 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 390 return H_PARAMETER; 391 } 392 393 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args, 394 uint32_t nret, uint64_t rets) 395 { 396 int token; 397 398 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) { 399 if (strcmp(cmd, rtas_table[token].name) == 0) { 400 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 401 PowerPCCPU *cpu = POWERPC_CPU(first_cpu); 402 403 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE, 404 nargs, args, nret, rets); 405 return H_SUCCESS; 406 } 407 } 408 return H_PARAMETER; 409 } 410 411 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 412 { 413 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)); 414 415 token -= RTAS_TOKEN_BASE; 416 417 assert(!rtas_table[token].name); 418 419 rtas_table[token].name = name; 420 rtas_table[token].fn = fn; 421 } 422 423 void spapr_dt_rtas_tokens(void *fdt, int rtas) 424 { 425 int i; 426 427 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 428 struct rtas_call *call = &rtas_table[i]; 429 430 if (!call->name) { 431 continue; 432 } 433 434 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE)); 435 } 436 } 437 438 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr) 439 { 440 int rtas_node; 441 int ret; 442 443 /* Copy RTAS blob into guest RAM */ 444 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size); 445 446 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size); 447 if (ret < 0) { 448 error_report("Couldn't add RTAS reserve entry: %s", 449 fdt_strerror(ret)); 450 exit(1); 451 } 452 453 /* Update the device tree with the blob's location */ 454 rtas_node = fdt_path_offset(fdt, "/rtas"); 455 assert(rtas_node >= 0); 456 457 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr); 458 if (ret < 0) { 459 error_report("Couldn't add linux,rtas-base property: %s", 460 fdt_strerror(ret)); 461 exit(1); 462 } 463 464 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr); 465 if (ret < 0) { 466 error_report("Couldn't add linux,rtas-entry property: %s", 467 fdt_strerror(ret)); 468 exit(1); 469 } 470 471 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size); 472 if (ret < 0) { 473 error_report("Couldn't add rtas-size property: %s", 474 fdt_strerror(ret)); 475 exit(1); 476 } 477 } 478 479 static void core_rtas_register_types(void) 480 { 481 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 482 rtas_display_character); 483 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 484 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 485 rtas_system_reboot); 486 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 487 rtas_query_cpu_stopped_state); 488 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 489 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 490 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 491 "ibm,get-system-parameter", 492 rtas_ibm_get_system_parameter); 493 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 494 "ibm,set-system-parameter", 495 rtas_ibm_set_system_parameter); 496 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term", 497 rtas_ibm_os_term); 498 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level", 499 rtas_set_power_level); 500 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", 501 rtas_get_power_level); 502 } 503 504 type_init(core_rtas_register_types) 505