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/spapr_cpu_core.h" 41 #include "hw/ppc/ppc.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 #include "target/ppc/mmu-hash64.h" 50 51 static void rtas_display_character(PowerPCCPU *cpu, sPAPRMachineState *spapr, 52 uint32_t token, uint32_t nargs, 53 target_ulong args, 54 uint32_t nret, target_ulong rets) 55 { 56 uint8_t c = rtas_ld(args, 0); 57 VIOsPAPRDevice *sdev = vty_lookup(spapr, 0); 58 59 if (!sdev) { 60 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 61 } else { 62 vty_putchars(sdev, &c, sizeof(c)); 63 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 64 } 65 } 66 67 static void rtas_power_off(PowerPCCPU *cpu, sPAPRMachineState *spapr, 68 uint32_t token, uint32_t nargs, target_ulong args, 69 uint32_t nret, target_ulong rets) 70 { 71 if (nargs != 2 || nret != 1) { 72 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 73 return; 74 } 75 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 76 cpu_stop_current(); 77 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 78 } 79 80 static void rtas_system_reboot(PowerPCCPU *cpu, sPAPRMachineState *spapr, 81 uint32_t token, uint32_t nargs, 82 target_ulong args, 83 uint32_t nret, target_ulong rets) 84 { 85 if (nargs != 0 || nret != 1) { 86 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 87 return; 88 } 89 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 90 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 91 } 92 93 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_, 94 sPAPRMachineState *spapr, 95 uint32_t token, uint32_t nargs, 96 target_ulong args, 97 uint32_t nret, target_ulong rets) 98 { 99 target_ulong id; 100 PowerPCCPU *cpu; 101 102 if (nargs != 1 || nret != 2) { 103 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 104 return; 105 } 106 107 id = rtas_ld(args, 0); 108 cpu = spapr_find_cpu(id); 109 if (cpu != NULL) { 110 if (CPU(cpu)->halted) { 111 rtas_st(rets, 1, 0); 112 } else { 113 rtas_st(rets, 1, 2); 114 } 115 116 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 117 return; 118 } 119 120 /* Didn't find a matching cpu */ 121 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 122 } 123 124 static void rtas_start_cpu(PowerPCCPU *callcpu, sPAPRMachineState *spapr, 125 uint32_t token, uint32_t nargs, 126 target_ulong args, 127 uint32_t nret, target_ulong rets) 128 { 129 target_ulong id, start, r3; 130 PowerPCCPU *newcpu; 131 CPUPPCState *env; 132 PowerPCCPUClass *pcc; 133 target_ulong lpcr; 134 135 if (nargs != 3 || nret != 1) { 136 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 137 return; 138 } 139 140 id = rtas_ld(args, 0); 141 start = rtas_ld(args, 1); 142 r3 = rtas_ld(args, 2); 143 144 newcpu = spapr_find_cpu(id); 145 if (!newcpu) { 146 /* Didn't find a matching cpu */ 147 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 148 return; 149 } 150 151 env = &newcpu->env; 152 pcc = POWERPC_CPU_GET_CLASS(newcpu); 153 154 if (!CPU(newcpu)->halted) { 155 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 156 return; 157 } 158 159 cpu_synchronize_state(CPU(newcpu)); 160 161 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME); 162 163 /* Enable Power-saving mode Exit Cause exceptions for the new CPU */ 164 lpcr = env->spr[SPR_LPCR] | pcc->lpcr_pm; 165 if (!pcc->interrupts_big_endian(callcpu)) { 166 lpcr |= LPCR_ILE; 167 } 168 ppc_store_lpcr(newcpu, lpcr); 169 170 /* 171 * Set the timebase offset of the new CPU to that of the invoking 172 * CPU. This helps hotplugged CPU to have the correct timebase 173 * offset. 174 */ 175 newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset; 176 177 spapr_cpu_set_entry_state(newcpu, start, r3); 178 179 qemu_cpu_kick(CPU(newcpu)); 180 181 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 182 } 183 184 static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr, 185 uint32_t token, uint32_t nargs, 186 target_ulong args, 187 uint32_t nret, target_ulong rets) 188 { 189 CPUState *cs = CPU(cpu); 190 CPUPPCState *env = &cpu->env; 191 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); 192 193 /* Disable Power-saving mode Exit Cause exceptions for the CPU. 194 * This could deliver an interrupt on a dying CPU and crash the 195 * guest */ 196 ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm); 197 cs->halted = 1; 198 qemu_cpu_kick(cs); 199 } 200 201 static inline int sysparm_st(target_ulong addr, target_ulong len, 202 const void *val, uint16_t vallen) 203 { 204 hwaddr phys = ppc64_phys_to_real(addr); 205 206 if (len < 2) { 207 return RTAS_OUT_SYSPARM_PARAM_ERROR; 208 } 209 stw_be_phys(&address_space_memory, phys, vallen); 210 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen)); 211 return RTAS_OUT_SUCCESS; 212 } 213 214 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu, 215 sPAPRMachineState *spapr, 216 uint32_t token, uint32_t nargs, 217 target_ulong args, 218 uint32_t nret, target_ulong rets) 219 { 220 target_ulong parameter = rtas_ld(args, 0); 221 target_ulong buffer = rtas_ld(args, 1); 222 target_ulong length = rtas_ld(args, 2); 223 target_ulong ret; 224 225 switch (parameter) { 226 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: { 227 char *param_val = g_strdup_printf("MaxEntCap=%d," 228 "DesMem=%llu," 229 "DesProcs=%d," 230 "MaxPlatProcs=%d", 231 max_cpus, 232 current_machine->ram_size / M_BYTE, 233 smp_cpus, 234 max_cpus); 235 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1); 236 g_free(param_val); 237 break; 238 } 239 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: { 240 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED; 241 242 ret = sysparm_st(buffer, length, ¶m_val, sizeof(param_val)); 243 break; 244 } 245 case RTAS_SYSPARM_UUID: 246 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid, 247 (qemu_uuid_set ? 16 : 0)); 248 break; 249 default: 250 ret = RTAS_OUT_NOT_SUPPORTED; 251 } 252 253 rtas_st(rets, 0, ret); 254 } 255 256 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu, 257 sPAPRMachineState *spapr, 258 uint32_t token, uint32_t nargs, 259 target_ulong args, 260 uint32_t nret, target_ulong rets) 261 { 262 target_ulong parameter = rtas_ld(args, 0); 263 target_ulong ret = RTAS_OUT_NOT_SUPPORTED; 264 265 switch (parameter) { 266 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: 267 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: 268 case RTAS_SYSPARM_UUID: 269 ret = RTAS_OUT_NOT_AUTHORIZED; 270 break; 271 } 272 273 rtas_st(rets, 0, ret); 274 } 275 276 static void rtas_ibm_os_term(PowerPCCPU *cpu, 277 sPAPRMachineState *spapr, 278 uint32_t token, uint32_t nargs, 279 target_ulong args, 280 uint32_t nret, target_ulong rets) 281 { 282 qemu_system_guest_panicked(NULL); 283 284 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 285 } 286 287 static void rtas_set_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 288 uint32_t token, uint32_t nargs, 289 target_ulong args, uint32_t nret, 290 target_ulong rets) 291 { 292 int32_t power_domain; 293 294 if (nargs != 2 || nret != 2) { 295 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 296 return; 297 } 298 299 /* we currently only use a single, "live insert" powerdomain for 300 * hotplugged/dlpar'd resources, so the power is always live/full (100) 301 */ 302 power_domain = rtas_ld(args, 0); 303 if (power_domain != -1) { 304 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 305 return; 306 } 307 308 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 309 rtas_st(rets, 1, 100); 310 } 311 312 static void rtas_get_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr, 313 uint32_t token, uint32_t nargs, 314 target_ulong args, uint32_t nret, 315 target_ulong rets) 316 { 317 int32_t power_domain; 318 319 if (nargs != 1 || nret != 2) { 320 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 321 return; 322 } 323 324 /* we currently only use a single, "live insert" powerdomain for 325 * hotplugged/dlpar'd resources, so the power is always live/full (100) 326 */ 327 power_domain = rtas_ld(args, 0); 328 if (power_domain != -1) { 329 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED); 330 return; 331 } 332 333 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 334 rtas_st(rets, 1, 100); 335 } 336 337 static struct rtas_call { 338 const char *name; 339 spapr_rtas_fn fn; 340 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE]; 341 342 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *spapr, 343 uint32_t token, uint32_t nargs, target_ulong args, 344 uint32_t nret, target_ulong rets) 345 { 346 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) { 347 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE); 348 349 if (call->fn) { 350 call->fn(cpu, spapr, token, nargs, args, nret, rets); 351 return H_SUCCESS; 352 } 353 } 354 355 /* HACK: Some Linux early debug code uses RTAS display-character, 356 * but assumes the token value is 0xa (which it is on some real 357 * machines) without looking it up in the device tree. This 358 * special case makes this work */ 359 if (token == 0xa) { 360 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets); 361 return H_SUCCESS; 362 } 363 364 hcall_dprintf("Unknown RTAS token 0x%x\n", token); 365 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 366 return H_PARAMETER; 367 } 368 369 uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args, 370 uint32_t nret, uint64_t rets) 371 { 372 int token; 373 374 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) { 375 if (strcmp(cmd, rtas_table[token].name) == 0) { 376 sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); 377 PowerPCCPU *cpu = POWERPC_CPU(first_cpu); 378 379 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE, 380 nargs, args, nret, rets); 381 return H_SUCCESS; 382 } 383 } 384 return H_PARAMETER; 385 } 386 387 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn) 388 { 389 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)); 390 391 token -= RTAS_TOKEN_BASE; 392 393 assert(!rtas_table[token].name); 394 395 rtas_table[token].name = name; 396 rtas_table[token].fn = fn; 397 } 398 399 void spapr_dt_rtas_tokens(void *fdt, int rtas) 400 { 401 int i; 402 403 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) { 404 struct rtas_call *call = &rtas_table[i]; 405 406 if (!call->name) { 407 continue; 408 } 409 410 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE)); 411 } 412 } 413 414 void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr) 415 { 416 int rtas_node; 417 int ret; 418 419 /* Copy RTAS blob into guest RAM */ 420 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size); 421 422 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size); 423 if (ret < 0) { 424 error_report("Couldn't add RTAS reserve entry: %s", 425 fdt_strerror(ret)); 426 exit(1); 427 } 428 429 /* Update the device tree with the blob's location */ 430 rtas_node = fdt_path_offset(fdt, "/rtas"); 431 assert(rtas_node >= 0); 432 433 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr); 434 if (ret < 0) { 435 error_report("Couldn't add linux,rtas-base property: %s", 436 fdt_strerror(ret)); 437 exit(1); 438 } 439 440 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr); 441 if (ret < 0) { 442 error_report("Couldn't add linux,rtas-entry property: %s", 443 fdt_strerror(ret)); 444 exit(1); 445 } 446 447 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size); 448 if (ret < 0) { 449 error_report("Couldn't add rtas-size property: %s", 450 fdt_strerror(ret)); 451 exit(1); 452 } 453 } 454 455 static void core_rtas_register_types(void) 456 { 457 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character", 458 rtas_display_character); 459 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off); 460 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot", 461 rtas_system_reboot); 462 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state", 463 rtas_query_cpu_stopped_state); 464 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu); 465 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self); 466 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER, 467 "ibm,get-system-parameter", 468 rtas_ibm_get_system_parameter); 469 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER, 470 "ibm,set-system-parameter", 471 rtas_ibm_set_system_parameter); 472 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term", 473 rtas_ibm_os_term); 474 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level", 475 rtas_set_power_level); 476 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level", 477 rtas_get_power_level); 478 } 479 480 type_init(core_rtas_register_types) 481