hw/ppc/spapr_rtas.c

   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 "cpu.h"
  28 #include "sysemu/sysemu.h"
  29 #include "sysemu/char.h"
  30 #include "hw/qdev.h"
  31 #include "sysemu/device_tree.h"
  32
  33 #include "hw/ppc/spapr.h"
  34 #include "hw/ppc/spapr_vio.h"
  35 #include "qapi-event.h"
  36
  37 #include <libfdt.h>
  38
  39 static void rtas_display_character(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  40                                    uint32_t token, uint32_t nargs,
  41                                    target_ulong args,
  42                                    uint32_t nret, target_ulong rets)
  43 {
  44     uint8_t c = rtas_ld(args, 0);
  45     VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
  46
  47     if (!sdev) {
  48         rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
  49     } else {
  50         vty_putchars(sdev, &c, sizeof(c));
  51         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  52     }
  53 }
  54
  55 static void rtas_power_off(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  56                            uint32_t token, uint32_t nargs, target_ulong args,
  57                            uint32_t nret, target_ulong rets)
  58 {
  59     if (nargs != 2 || nret != 1) {
  60         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  61         return;
  62     }
  63     qemu_system_shutdown_request();
  64     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  65 }
  66
  67 static void rtas_system_reboot(PowerPCCPU *cpu, sPAPREnvironment *spapr,
  68                                uint32_t token, uint32_t nargs,
  69                                target_ulong args,
  70                                uint32_t nret, target_ulong rets)
  71 {
  72     if (nargs != 0 || nret != 1) {
  73         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  74         return;
  75     }
  76     qemu_system_reset_request();
  77     rtas_st(rets, 0, RTAS_OUT_SUCCESS);
  78 }
  79
  80 static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
  81                                          sPAPREnvironment *spapr,
  82                                          uint32_t token, uint32_t nargs,
  83                                          target_ulong args,
  84                                          uint32_t nret, target_ulong rets)
  85 {
  86     target_ulong id;
  87     PowerPCCPU *cpu;
  88
  89     if (nargs != 1 || nret != 2) {
  90         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
  91         return;
  92     }
  93
  94     id = rtas_ld(args, 0);
  95     cpu = ppc_get_vcpu_by_dt_id(id);
  96     if (cpu != NULL) {
  97         if (CPU(cpu)->halted) {
  98             rtas_st(rets, 1, 0);
  99         } else {
 100             rtas_st(rets, 1, 2);
 101         }
 102
 103         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 104         return;
 105     }
 106
 107     /* Didn't find a matching cpu */
 108     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 109 }
 110
 111 static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPREnvironment *spapr,
 112                            uint32_t token, uint32_t nargs,
 113                            target_ulong args,
 114                            uint32_t nret, target_ulong rets)
 115 {
 116     target_ulong id, start, r3;
 117     PowerPCCPU *cpu;
 118
 119     if (nargs != 3 || nret != 1) {
 120         rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 121         return;
 122     }
 123
 124     id = rtas_ld(args, 0);
 125     start = rtas_ld(args, 1);
 126     r3 = rtas_ld(args, 2);
 127
 128     cpu = ppc_get_vcpu_by_dt_id(id);
 129     if (cpu != NULL) {
 130         CPUState *cs = CPU(cpu);
 131         CPUPPCState *env = &cpu->env;
 132
 133         if (!cs->halted) {
 134             rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
 135             return;
 136         }
 137
 138         /* This will make sure qemu state is up to date with kvm, and
 139          * mark it dirty so our changes get flushed back before the
 140          * new cpu enters */
 141         kvm_cpu_synchronize_state(cs);
 142
 143         env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
 144         env->nip = start;
 145         env->gpr[3] = r3;
 146         cs->halted = 0;
 147
 148         qemu_cpu_kick(cs);
 149
 150         rtas_st(rets, 0, RTAS_OUT_SUCCESS);
 151         return;
 152     }
 153
 154     /* Didn't find a matching cpu */
 155     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 156 }
 157
 158 static void rtas_stop_self(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 159                            uint32_t token, uint32_t nargs,
 160                            target_ulong args,
 161                            uint32_t nret, target_ulong rets)
 162 {
 163     CPUState *cs = CPU(cpu);
 164     CPUPPCState *env = &cpu->env;
 165
 166     cs->halted = 1;
 167     cpu_exit(cs);
 168     /*
 169      * While stopping a CPU, the guest calls H_CPPR which
 170      * effectively disables interrupts on XICS level.
 171      * However decrementer interrupts in TCG can still
 172      * wake the CPU up so here we disable interrupts in MSR
 173      * as well.
 174      * As rtas_start_cpu() resets the whole MSR anyway, there is
 175      * no need to bother with specific bits, we just clear it.
 176      */
 177     env->msr = 0;
 178 }
 179
 180 static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
 181                                           sPAPREnvironment *spapr,
 182                                           uint32_t token, uint32_t nargs,
 183                                           target_ulong args,
 184                                           uint32_t nret, target_ulong rets)
 185 {
 186     target_ulong parameter = rtas_ld(args, 0);
 187     target_ulong buffer = rtas_ld(args, 1);
 188     target_ulong length = rtas_ld(args, 2);
 189     target_ulong ret = RTAS_OUT_SUCCESS;
 190
 191     switch (parameter) {
 192     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
 193         char *param_val = g_strdup_printf("MaxEntCap=%d,MaxPlatProcs=%d",
 194                                           max_cpus, smp_cpus);
 195         rtas_st_buffer(buffer, length, (uint8_t *)param_val, strlen(param_val));
 196         g_free(param_val);
 197         break;
 198     }
 199     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
 200         uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
 201
 202         rtas_st_buffer(buffer, length, &param_val, sizeof(param_val));
 203         break;
 204     }
 205     case RTAS_SYSPARM_UUID:
 206         rtas_st_buffer(buffer, length, qemu_uuid, (qemu_uuid_set ? 16 : 0));
 207         break;
 208     default:
 209         ret = RTAS_OUT_NOT_SUPPORTED;
 210     }
 211
 212     rtas_st(rets, 0, ret);
 213 }
 214
 215 static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
 216                                           sPAPREnvironment *spapr,
 217                                           uint32_t token, uint32_t nargs,
 218                                           target_ulong args,
 219                                           uint32_t nret, target_ulong rets)
 220 {
 221     target_ulong parameter = rtas_ld(args, 0);
 222     target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
 223
 224     switch (parameter) {
 225     case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
 226     case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
 227     case RTAS_SYSPARM_UUID:
 228         ret = RTAS_OUT_NOT_AUTHORIZED;
 229         break;
 230     }
 231
 232     rtas_st(rets, 0, ret);
 233 }
 234
 235 static void rtas_ibm_os_term(PowerPCCPU *cpu,
 236                             sPAPREnvironment *spapr,
 237                             uint32_t token, uint32_t nargs,
 238                             target_ulong args,
 239                             uint32_t nret, target_ulong rets)
 240 {
 241     target_ulong ret = 0;
 242
 243     qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE, &error_abort);
 244
 245     rtas_st(rets, 0, ret);
 246 }
 247
 248 static struct rtas_call {
 249     const char *name;
 250     spapr_rtas_fn fn;
 251 } rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
 252
 253 target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 254                              uint32_t token, uint32_t nargs, target_ulong args,
 255                              uint32_t nret, target_ulong rets)
 256 {
 257     if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
 258         struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
 259
 260         if (call->fn) {
 261             call->fn(cpu, spapr, token, nargs, args, nret, rets);
 262             return H_SUCCESS;
 263         }
 264     }
 265
 266     /* HACK: Some Linux early debug code uses RTAS display-character,
 267      * but assumes the token value is 0xa (which it is on some real
 268      * machines) without looking it up in the device tree.  This
 269      * special case makes this work */
 270     if (token == 0xa) {
 271         rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
 272         return H_SUCCESS;
 273     }
 274
 275     hcall_dprintf("Unknown RTAS token 0x%x\n", token);
 276     rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
 277     return H_PARAMETER;
 278 }
 279
 280 void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
 281 {
 282     if (!((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX))) {
 283         fprintf(stderr, "RTAS invalid token 0x%x\n", token);
 284         exit(1);
 285     }
 286
 287     token -= RTAS_TOKEN_BASE;
 288     if (rtas_table[token].name) {
 289         fprintf(stderr, "RTAS call \"%s\" is registered already as 0x%x\n",
 290                 rtas_table[token].name, token);
 291         exit(1);
 292     }
 293
 294     rtas_table[token].name = name;
 295     rtas_table[token].fn = fn;
 296 }
 297
 298 int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
 299                                  hwaddr rtas_size)
 300 {
 301     int ret;
 302     int i;
 303
 304     ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
 305     if (ret < 0) {
 306         fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
 307                 fdt_strerror(ret));
 308         return ret;
 309     }
 310
 311     ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-base",
 312                                 rtas_addr);
 313     if (ret < 0) {
 314         fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
 315                 fdt_strerror(ret));
 316         return ret;
 317     }
 318
 319     ret = qemu_fdt_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
 320                                 rtas_addr);
 321     if (ret < 0) {
 322         fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
 323                 fdt_strerror(ret));
 324         return ret;
 325     }
 326
 327     ret = qemu_fdt_setprop_cell(fdt, "/rtas", "rtas-size",
 328                                 rtas_size);
 329     if (ret < 0) {
 330         fprintf(stderr, "Couldn't add rtas-size property: %s\n",
 331                 fdt_strerror(ret));
 332         return ret;
 333     }
 334
 335     for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
 336         struct rtas_call *call = &rtas_table[i];
 337
 338         if (!call->name) {
 339             continue;
 340         }
 341
 342         ret = qemu_fdt_setprop_cell(fdt, "/rtas", call->name,
 343                                     i + RTAS_TOKEN_BASE);
 344         if (ret < 0) {
 345             fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
 346                     call->name, fdt_strerror(ret));
 347             return ret;
 348         }
 349
 350     }
 351     return 0;
 352 }
 353
 354 static void core_rtas_register_types(void)
 355 {
 356     spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
 357                         rtas_display_character);
 358     spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
 359     spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
 360                         rtas_system_reboot);
 361     spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
 362                         rtas_query_cpu_stopped_state);
 363     spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
 364     spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
 365     spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
 366                         "ibm,get-system-parameter",
 367                         rtas_ibm_get_system_parameter);
 368     spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
 369                         "ibm,set-system-parameter",
 370                         rtas_ibm_set_system_parameter);
 371     spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
 372                         rtas_ibm_os_term);
 373 }
 374
 375 type_init(core_rtas_register_types)