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; 165 166 if (!cs->halted) { 167 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 168 return; 169 } 170 171 /* This will make sure qemu state is up to date with kvm, and 172 * mark it dirty so our changes get flushed back before the 173 * new cpu enters */ 174 kvm_cpu_synchronize_state(cs); 175 176 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 177 env->nip = start; 178 env->gpr[3] = r3; 179 cs->halted = 0; 180 spapr_cpu_set_endianness(cpu); 181 spapr_cpu_update_tb_offset(cpu); 182 183 qemu_cpu_kick(cs); 184 185 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 186 return; 187 } 188 189 /* Didn't find a matching cpu */ 190 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 191 } 192 193 static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr, 194 uint32_t token, uint32_t nargs, 195 target_ulong args, 196 uint32_t nret, target_ulong rets) 197 { 198 CPUState *cs = CPU(cpu); 199 CPUPPCState *env = &cpu->env; 200 201 cs->halted = 1; 202 qemu_cpu_kick(cs); 203 /* 204 * While stopping a CPU, the guest calls H_CPPR which 205 * effectively disables interrupts on XICS level. 206 * However decrementer interrupts in TCG can still 207 * wake the CPU up so here we disable interrupts in MSR 208 * as well. 209 * As rtas_start_cpu() resets the whole MSR anyway, there is 210 * no need to bother with specific bits, we just clear it. 211 */ 212 env->msr = 0; 213 } 214 215 static inline int sysparm_st(target_ulong addr, target_ulong len, 216 const void *val, uint16_t vallen) 217 { 218 hwaddr phys = ppc64_phys_to_real(addr); 219 220 if (len < 2) { 221 return RTAS_OUT_SYSPARM_PARAM_ERROR; 222 } 223 stw_be_phys(&address_space_memory, phys, vallen); 224 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen)); 225 return RTAS_OUT_SUCCESS; 226 } 227 228 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 229 sPAPRMachineState *spapr, 230 uint32_t token, uint32_t nargs, 231 target_ulong args, 232 uint32_t nret, target_ulong rets) 233 { 234 target_ulong parameter = rtas_ld(args, 0); 235 target_ulong buffer = rtas_ld(args, 1); 236 target_ulong length = rtas_ld(args, 2); 237 target_ulong ret; 238 239 switch (parameter) { 240 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: { 241 char *param_val = g_strdup_printf("MaxEntCap=%d," 242 "DesMem=%llu," 243 "DesProcs=%d," 244 "MaxPlatProcs=%d", 245 max_cpus, 246 current_machine->ram_size / M_BYTE, 247 smp_cpus, 248 max_cpus); 249 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1); 250 g_free(param_val); 251 break; 252 } 253 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: { 254 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED; 255 256 ret = sysparm_st(buffer, length, ¶m_val, sizeof(param_val)); 257 break; 258 } 259 case RTAS_SYSPARM_UUID: 260 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid, 261 (qemu_uuid_set ? 16 : 0)); 262 break; 263 default: 264 ret = RTAS_OUT_NOT_SUPPORTED; 265 } 266 267 rtas_st(rets, 0, ret); 268 } 269 270 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 271 sPAPRMachineState *spapr, 272 uint32_t token, uint32_t nargs, 273 target_ulong args, 274 uint32_t nret, target_ulong rets) 275 { 276 target_ulong parameter = rtas_ld(args, 0); 277 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 278 279 switch (parameter) { 280 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: 281 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: 282 case RTAS_SYSPARM_UUID: 283 ret = RTAS_OUT_NOT_AUTHORIZED; 284 break; 285 } 286 287 rtas_st(rets, 0, ret); 288 } 289 290 static void rtas_ibm_os_term(PowerPCCPU *cpu, 291 sPAPRMachineState *spapr, 292 uint32_t token, uint32_t nargs, 293 target_ulong args, 294 uint32_t nret, target_ulong rets) 295 { 296 qemu_system_guest_panicked(NULL); 297 298 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 299 } 300 301 static void rtas_set_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 302 uint32_t token, uint32_t nargs, 303 target_ulong args, uint32_t nret, 304 target_ulong rets) 305 { 306 int32_t power_domain; 307 308 if (nargs != 2 || nret != 2) { 309 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 310 return; 311 } 312 313 /* we currently only use a single, "live insert" powerdomain for 314 * hotplugged/dlpar'd resources, so the power is always live/full (100) 315 */ 316 power_domain = rtas_ld(args, 0); 317 if (power_domain != -1) { 318 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 319 return; 320 } 321 322 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 323 rtas_st(rets, 1, 100); 324 } 325 326 static void rtas_get_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 327 uint32_t token, uint32_t nargs, 328 target_ulong args, uint32_t nret, 329 target_ulong rets) 330 { 331 int32_t power_domain; 332 333 if (nargs != 1 || nret != 2) { 334 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 335 return; 336 } 337 338 /* we currently only use a single, "live insert" powerdomain for 339 * hotplugged/dlpar'd resources, so the power is always live/full (100) 340 */ 341 power_domain = rtas_ld(args, 0); 342 if (power_domain != -1) { 343 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 344 return; 345 } 346 347 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 348 rtas_st(rets, 1, 100); 349 } 350 351 static struct rtas_call { 352 const char *name; 353 spapr_rtas_fn fn; 354 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 355 356 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *spapr, 357 uint32_t token, uint32_t nargs, target_ulong args, 358 uint32_t nret, target_ulong rets) 359 { 360 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 361 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 362 363 if (call->fn) { 364 call->fn(cpu, spapr, token, nargs, args, nret, rets); 365 return H_SUCCESS; 366 } 367 } 368 369 /* HACK: Some Linux early debug code uses RTAS display-character, 370 * but assumes the token value is 0xa (which it is on some real 371 * machines) without looking it up in the device tree. This 372 * special case makes this work */ 373 if (token == 0xa) { 374 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 375 return H_SUCCESS; 376 } 377 378 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 379 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 380 return H_PARAMETER; 381 } 382 383 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args, 384 uint32_t nret, uint64_t rets) 385 { 386 int token; 387 388 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) { 389 if (strcmp(cmd, rtas_table[token].name) == 0) { 390 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 391 PowerPCCPU *cpu = POWERPC_CPU(first_cpu); 392 393 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE, 394 nargs, args, nret, rets); 395 return H_SUCCESS; 396 } 397 } 398 return H_PARAMETER; 399 } 400 401 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 402 { 403 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)); 404 405 token -= RTAS_TOKEN_BASE; 406 407 assert(!rtas_table[token].name); 408 409 rtas_table[token].name = name; 410 rtas_table[token].fn = fn; 411 } 412 413 void spapr_dt_rtas_tokens(void *fdt, int rtas) 414 { 415 int i; 416 417 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 418 struct rtas_call *call = &rtas_table[i]; 419 420 if (!call->name) { 421 continue; 422 } 423 424 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE)); 425 } 426 } 427 428 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr) 429 { 430 int rtas_node; 431 int ret; 432 433 /* Copy RTAS blob into guest RAM */ 434 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size); 435 436 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size); 437 if (ret < 0) { 438 error_report("Couldn't add RTAS reserve entry: %s", 439 fdt_strerror(ret)); 440 exit(1); 441 } 442 443 /* Update the device tree with the blob's location */ 444 rtas_node = fdt_path_offset(fdt, "/rtas"); 445 assert(rtas_node >= 0); 446 447 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr); 448 if (ret < 0) { 449 error_report("Couldn't add linux,rtas-base property: %s", 450 fdt_strerror(ret)); 451 exit(1); 452 } 453 454 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr); 455 if (ret < 0) { 456 error_report("Couldn't add linux,rtas-entry property: %s", 457 fdt_strerror(ret)); 458 exit(1); 459 } 460 461 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size); 462 if (ret < 0) { 463 error_report("Couldn't add rtas-size property: %s", 464 fdt_strerror(ret)); 465 exit(1); 466 } 467 } 468 469 static void core_rtas_register_types(void) 470 { 471 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 472 rtas_display_character); 473 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 474 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 475 rtas_system_reboot); 476 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 477 rtas_query_cpu_stopped_state); 478 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 479 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 480 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 481 "ibm,get-system-parameter", 482 rtas_ibm_get_system_parameter); 483 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 484 "ibm,set-system-parameter", 485 rtas_ibm_set_system_parameter); 486 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term", 487 rtas_ibm_os_term); 488 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level", 489 rtas_set_power_level); 490 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", 491 rtas_get_power_level); 492 } 493 494 type_init(core_rtas_register_types) 495