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 VIOsPAPRDevice *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 } 181 ppc_store_lpcr(newcpu, lpcr); 182 183 /* 184 * Set the timebase offset of the new CPU to that of the invoking 185 * CPU. This helps hotplugged CPU to have the correct timebase 186 * offset. 187 */ 188 newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset; 189 190 spapr_cpu_set_entry_state(newcpu, start, r3); 191 192 qemu_cpu_kick(CPU(newcpu)); 193 194 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 195 } 196 197 static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr, 198 uint32_t token, uint32_t nargs, 199 target_ulong args, 200 uint32_t nret, target_ulong rets) 201 { 202 CPUState *cs = CPU(cpu); 203 CPUPPCState *env = &cpu->env; 204 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 205 206 /* Disable Power-saving mode Exit Cause exceptions for the CPU. 207 * This could deliver an interrupt on a dying CPU and crash the 208 * guest */ 209 ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm); 210 cs->halted = 1; 211 kvmppc_set_reg_ppc_online(cpu, 0); 212 qemu_cpu_kick(cs); 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=%" PRIu64 "," 243 "DesProcs=%d," 244 "MaxPlatProcs=%d", 245 max_cpus, 246 current_machine->ram_size / MiB, 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