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