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 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 "hw/boards.h" 42 43 #include <libfdt.h> 44 #include "hw/ppc/spapr_drc.h" 45 #include "qemu/cutils.h" 46 #include "trace.h" 47 #include "hw/ppc/fdt.h" 48 #include "target/ppc/mmu-hash64.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 static void rtas_start_cpu(PowerPCCPU *callcpu, sPAPRMachineState *spapr, 124 uint32_t token, uint32_t nargs, 125 target_ulong args, 126 uint32_t nret, target_ulong rets) 127 { 128 target_ulong id, start, r3; 129 PowerPCCPU *newcpu; 130 CPUPPCState *env; 131 PowerPCCPUClass *pcc; 132 target_ulong lpcr; 133 134 if (nargs != 3 || nret != 1) { 135 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 136 return; 137 } 138 139 id = rtas_ld(args, 0); 140 start = rtas_ld(args, 1); 141 r3 = rtas_ld(args, 2); 142 143 newcpu = spapr_find_cpu(id); 144 if (!newcpu) { 145 /* Didn't find a matching cpu */ 146 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 147 return; 148 } 149 150 env = &newcpu->env; 151 pcc = POWERPC_CPU_GET_CLASS(newcpu); 152 153 if (!CPU(newcpu)->halted) { 154 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 155 return; 156 } 157 158 cpu_synchronize_state(CPU(newcpu)); 159 160 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 161 162 /* Enable Power-saving mode Exit Cause exceptions for the new CPU */ 163 lpcr = env->spr[SPR_LPCR] | pcc->lpcr_pm; 164 if (!pcc->interrupts_big_endian(callcpu)) { 165 lpcr |= LPCR_ILE; 166 } 167 ppc_store_lpcr(newcpu, lpcr); 168 169 /* 170 * Set the timebase offset of the new CPU to that of the invoking 171 * CPU. This helps hotplugged CPU to have the correct timebase 172 * offset. 173 */ 174 newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset; 175 176 env->nip = start; 177 env->gpr[3] = r3; 178 179 CPU(newcpu)->halted = 0; 180 181 qemu_cpu_kick(CPU(newcpu)); 182 183 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 184 } 185 186 static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr, 187 uint32_t token, uint32_t nargs, 188 target_ulong args, 189 uint32_t nret, target_ulong rets) 190 { 191 CPUState *cs = CPU(cpu); 192 CPUPPCState *env = &cpu->env; 193 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 194 195 /* Disable Power-saving mode Exit Cause exceptions for the CPU. 196 * This could deliver an interrupt on a dying CPU and crash the 197 * guest */ 198 ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm); 199 cs->halted = 1; 200 qemu_cpu_kick(cs); 201 } 202 203 static inline int sysparm_st(target_ulong addr, target_ulong len, 204 const void *val, uint16_t vallen) 205 { 206 hwaddr phys = ppc64_phys_to_real(addr); 207 208 if (len < 2) { 209 return RTAS_OUT_SYSPARM_PARAM_ERROR; 210 } 211 stw_be_phys(&address_space_memory, phys, vallen); 212 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen)); 213 return RTAS_OUT_SUCCESS; 214 } 215 216 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 217 sPAPRMachineState *spapr, 218 uint32_t token, uint32_t nargs, 219 target_ulong args, 220 uint32_t nret, target_ulong rets) 221 { 222 target_ulong parameter = rtas_ld(args, 0); 223 target_ulong buffer = rtas_ld(args, 1); 224 target_ulong length = rtas_ld(args, 2); 225 target_ulong ret; 226 227 switch (parameter) { 228 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: { 229 char *param_val = g_strdup_printf("MaxEntCap=%d," 230 "DesMem=%llu," 231 "DesProcs=%d," 232 "MaxPlatProcs=%d", 233 max_cpus, 234 current_machine->ram_size / M_BYTE, 235 smp_cpus, 236 max_cpus); 237 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1); 238 g_free(param_val); 239 break; 240 } 241 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: { 242 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED; 243 244 ret = sysparm_st(buffer, length, ¶m_val, sizeof(param_val)); 245 break; 246 } 247 case RTAS_SYSPARM_UUID: 248 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid, 249 (qemu_uuid_set ? 16 : 0)); 250 break; 251 default: 252 ret = RTAS_OUT_NOT_SUPPORTED; 253 } 254 255 rtas_st(rets, 0, ret); 256 } 257 258 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 259 sPAPRMachineState *spapr, 260 uint32_t token, uint32_t nargs, 261 target_ulong args, 262 uint32_t nret, target_ulong rets) 263 { 264 target_ulong parameter = rtas_ld(args, 0); 265 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 266 267 switch (parameter) { 268 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: 269 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: 270 case RTAS_SYSPARM_UUID: 271 ret = RTAS_OUT_NOT_AUTHORIZED; 272 break; 273 } 274 275 rtas_st(rets, 0, ret); 276 } 277 278 static void rtas_ibm_os_term(PowerPCCPU *cpu, 279 sPAPRMachineState *spapr, 280 uint32_t token, uint32_t nargs, 281 target_ulong args, 282 uint32_t nret, target_ulong rets) 283 { 284 qemu_system_guest_panicked(NULL); 285 286 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 287 } 288 289 static void rtas_set_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 290 uint32_t token, uint32_t nargs, 291 target_ulong args, uint32_t nret, 292 target_ulong rets) 293 { 294 int32_t power_domain; 295 296 if (nargs != 2 || nret != 2) { 297 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 298 return; 299 } 300 301 /* we currently only use a single, "live insert" powerdomain for 302 * hotplugged/dlpar'd resources, so the power is always live/full (100) 303 */ 304 power_domain = rtas_ld(args, 0); 305 if (power_domain != -1) { 306 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 307 return; 308 } 309 310 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 311 rtas_st(rets, 1, 100); 312 } 313 314 static void rtas_get_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 315 uint32_t token, uint32_t nargs, 316 target_ulong args, uint32_t nret, 317 target_ulong rets) 318 { 319 int32_t power_domain; 320 321 if (nargs != 1 || nret != 2) { 322 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 323 return; 324 } 325 326 /* we currently only use a single, "live insert" powerdomain for 327 * hotplugged/dlpar'd resources, so the power is always live/full (100) 328 */ 329 power_domain = rtas_ld(args, 0); 330 if (power_domain != -1) { 331 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 332 return; 333 } 334 335 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 336 rtas_st(rets, 1, 100); 337 } 338 339 static struct rtas_call { 340 const char *name; 341 spapr_rtas_fn fn; 342 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 343 344 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *spapr, 345 uint32_t token, uint32_t nargs, target_ulong args, 346 uint32_t nret, target_ulong rets) 347 { 348 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 349 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 350 351 if (call->fn) { 352 call->fn(cpu, spapr, token, nargs, args, nret, rets); 353 return H_SUCCESS; 354 } 355 } 356 357 /* HACK: Some Linux early debug code uses RTAS display-character, 358 * but assumes the token value is 0xa (which it is on some real 359 * machines) without looking it up in the device tree. This 360 * special case makes this work */ 361 if (token == 0xa) { 362 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 363 return H_SUCCESS; 364 } 365 366 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 367 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 368 return H_PARAMETER; 369 } 370 371 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args, 372 uint32_t nret, uint64_t rets) 373 { 374 int token; 375 376 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) { 377 if (strcmp(cmd, rtas_table[token].name) == 0) { 378 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 379 PowerPCCPU *cpu = POWERPC_CPU(first_cpu); 380 381 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE, 382 nargs, args, nret, rets); 383 return H_SUCCESS; 384 } 385 } 386 return H_PARAMETER; 387 } 388 389 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 390 { 391 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)); 392 393 token -= RTAS_TOKEN_BASE; 394 395 assert(!rtas_table[token].name); 396 397 rtas_table[token].name = name; 398 rtas_table[token].fn = fn; 399 } 400 401 void spapr_dt_rtas_tokens(void *fdt, int rtas) 402 { 403 int i; 404 405 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 406 struct rtas_call *call = &rtas_table[i]; 407 408 if (!call->name) { 409 continue; 410 } 411 412 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE)); 413 } 414 } 415 416 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr) 417 { 418 int rtas_node; 419 int ret; 420 421 /* Copy RTAS blob into guest RAM */ 422 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size); 423 424 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size); 425 if (ret < 0) { 426 error_report("Couldn't add RTAS reserve entry: %s", 427 fdt_strerror(ret)); 428 exit(1); 429 } 430 431 /* Update the device tree with the blob's location */ 432 rtas_node = fdt_path_offset(fdt, "/rtas"); 433 assert(rtas_node >= 0); 434 435 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr); 436 if (ret < 0) { 437 error_report("Couldn't add linux,rtas-base property: %s", 438 fdt_strerror(ret)); 439 exit(1); 440 } 441 442 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr); 443 if (ret < 0) { 444 error_report("Couldn't add linux,rtas-entry property: %s", 445 fdt_strerror(ret)); 446 exit(1); 447 } 448 449 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size); 450 if (ret < 0) { 451 error_report("Couldn't add rtas-size property: %s", 452 fdt_strerror(ret)); 453 exit(1); 454 } 455 } 456 457 static void core_rtas_register_types(void) 458 { 459 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 460 rtas_display_character); 461 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 462 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 463 rtas_system_reboot); 464 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 465 rtas_query_cpu_stopped_state); 466 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 467 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 468 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 469 "ibm,get-system-parameter", 470 rtas_ibm_get_system_parameter); 471 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 472 "ibm,set-system-parameter", 473 rtas_ibm_set_system_parameter); 474 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term", 475 rtas_ibm_os_term); 476 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level", 477 rtas_set_power_level); 478 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", 479 rtas_get_power_level); 480 } 481 482 type_init(core_rtas_register_types) 483