LXR qemu/hw/ppc/spapr

   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
  50static 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
  66static 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
  79static 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
  92static 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 */
 127static 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
 134static 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
 144static 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
 193static 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
 215static 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
 228static 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, &param_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
 270static 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
 290static 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
 301static 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
 326static 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
 351static struct rtas_call {
 352    const char *name;
 353    spapr_rtas_fn fn;
 354} rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
 355
 356target_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
 383uint64_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
 401void 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
 413void 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
 428void 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
 469static 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
 494type_init(core_rtas_register_types)
 495