aboutsummaryrefslogtreecommitdiff
path: root/hw/ppc/spapr_rtas.c
blob: 94a2799b99d4a8b8622a08d3b4e865388c40e593 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
/*
 * QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
 *
 * Hypercall based emulated RTAS
 *
 * Copyright (c) 2010-2011 David Gibson, IBM Corporation.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */
#include "qemu/osdep.h"
#include "cpu.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "sysemu/sysemu.h"
#include "hw/qdev.h"
#include "sysemu/device_tree.h"
#include "sysemu/cpus.h"
#include "sysemu/kvm.h"

#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include "hw/ppc/spapr_rtas.h"
#include "hw/ppc/ppc.h"
#include "qapi-event.h"
#include "hw/boards.h"

#include <libfdt.h>
#include "hw/ppc/spapr_drc.h"
#include "qemu/cutils.h"
#include "trace.h"
#include "hw/ppc/fdt.h"

static void rtas_display_character(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                                   uint32_t token, uint32_t nargs,
                                   target_ulong args,
                                   uint32_t nret, target_ulong rets)
{
    uint8_t c = rtas_ld(args, 0);
    VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);

    if (!sdev) {
        rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
    } else {
        vty_putchars(sdev, &c, sizeof(c));
        rtas_st(rets, 0, RTAS_OUT_SUCCESS);
    }
}

static void rtas_power_off(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                           uint32_t token, uint32_t nargs, target_ulong args,
                           uint32_t nret, target_ulong rets)
{
    if (nargs != 2 || nret != 1) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }
    qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
    cpu_stop_current();
    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}

static void rtas_system_reboot(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                               uint32_t token, uint32_t nargs,
                               target_ulong args,
                               uint32_t nret, target_ulong rets)
{
    if (nargs != 0 || nret != 1) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }
    qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}

static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
                                         sPAPRMachineState *spapr,
                                         uint32_t token, uint32_t nargs,
                                         target_ulong args,
                                         uint32_t nret, target_ulong rets)
{
    target_ulong id;
    PowerPCCPU *cpu;

    if (nargs != 1 || nret != 2) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }

    id = rtas_ld(args, 0);
    cpu = ppc_get_vcpu_by_dt_id(id);
    if (cpu != NULL) {
        if (CPU(cpu)->halted) {
            rtas_st(rets, 1, 0);
        } else {
            rtas_st(rets, 1, 2);
        }

        rtas_st(rets, 0, RTAS_OUT_SUCCESS);
        return;
    }

    /* Didn't find a matching cpu */
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

/*
 * Set the timebase offset of the CPU to that of first CPU.
 * This helps hotplugged CPU to have the correct timebase offset.
 */
static void spapr_cpu_update_tb_offset(PowerPCCPU *cpu)
{
    PowerPCCPU *fcpu = POWERPC_CPU(first_cpu);

    cpu->env.tb_env->tb_offset = fcpu->env.tb_env->tb_offset;
}

static void spapr_cpu_set_endianness(PowerPCCPU *cpu)
{
    PowerPCCPU *fcpu = POWERPC_CPU(first_cpu);
    PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(fcpu);

    if (!pcc->interrupts_big_endian(fcpu)) {
        cpu->env.spr[SPR_LPCR] |= LPCR_ILE;
    }
}

static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPRMachineState *spapr,
                           uint32_t token, uint32_t nargs,
                           target_ulong args,
                           uint32_t nret, target_ulong rets)
{
    target_ulong id, start, r3;
    PowerPCCPU *cpu;

    if (nargs != 3 || nret != 1) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }

    id = rtas_ld(args, 0);
    start = rtas_ld(args, 1);
    r3 = rtas_ld(args, 2);

    cpu = ppc_get_vcpu_by_dt_id(id);
    if (cpu != NULL) {
        CPUState *cs = CPU(cpu);
        CPUPPCState *env = &cpu->env;

        if (!cs->halted) {
            rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
            return;
        }

        /* This will make sure qemu state is up to date with kvm, and
         * mark it dirty so our changes get flushed back before the
         * new cpu enters */
        kvm_cpu_synchronize_state(cs);

        env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
        env->nip = start;
        env->gpr[3] = r3;
        cs->halted = 0;
        spapr_cpu_set_endianness(cpu);
        spapr_cpu_update_tb_offset(cpu);

        qemu_cpu_kick(cs);

        rtas_st(rets, 0, RTAS_OUT_SUCCESS);
        return;
    }

    /* Didn't find a matching cpu */
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
}

static void rtas_stop_self(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                           uint32_t token, uint32_t nargs,
                           target_ulong args,
                           uint32_t nret, target_ulong rets)
{
    CPUState *cs = CPU(cpu);
    CPUPPCState *env = &cpu->env;

    cs->halted = 1;
    qemu_cpu_kick(cs);
    /*
     * While stopping a CPU, the guest calls H_CPPR which
     * effectively disables interrupts on XICS level.
     * However decrementer interrupts in TCG can still
     * wake the CPU up so here we disable interrupts in MSR
     * as well.
     * As rtas_start_cpu() resets the whole MSR anyway, there is
     * no need to bother with specific bits, we just clear it.
     */
    env->msr = 0;
}

static inline int sysparm_st(target_ulong addr, target_ulong len,
                             const void *val, uint16_t vallen)
{
    hwaddr phys = ppc64_phys_to_real(addr);

    if (len < 2) {
        return RTAS_OUT_SYSPARM_PARAM_ERROR;
    }
    stw_be_phys(&address_space_memory, phys, vallen);
    cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
    return RTAS_OUT_SUCCESS;
}

static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
                                          sPAPRMachineState *spapr,
                                          uint32_t token, uint32_t nargs,
                                          target_ulong args,
                                          uint32_t nret, target_ulong rets)
{
    target_ulong parameter = rtas_ld(args, 0);
    target_ulong buffer = rtas_ld(args, 1);
    target_ulong length = rtas_ld(args, 2);
    target_ulong ret;

    switch (parameter) {
    case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
        char *param_val = g_strdup_printf("MaxEntCap=%d,"
                                          "DesMem=%llu,"
                                          "DesProcs=%d,"
                                          "MaxPlatProcs=%d",
                                          max_cpus,
                                          current_machine->ram_size / M_BYTE,
                                          smp_cpus,
                                          max_cpus);
        ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
        g_free(param_val);
        break;
    }
    case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
        uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;

        ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
        break;
    }
    case RTAS_SYSPARM_UUID:
        ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid,
                         (qemu_uuid_set ? 16 : 0));
        break;
    default:
        ret = RTAS_OUT_NOT_SUPPORTED;
    }

    rtas_st(rets, 0, ret);
}

static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
                                          sPAPRMachineState *spapr,
                                          uint32_t token, uint32_t nargs,
                                          target_ulong args,
                                          uint32_t nret, target_ulong rets)
{
    target_ulong parameter = rtas_ld(args, 0);
    target_ulong ret = RTAS_OUT_NOT_SUPPORTED;

    switch (parameter) {
    case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
    case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
    case RTAS_SYSPARM_UUID:
        ret = RTAS_OUT_NOT_AUTHORIZED;
        break;
    }

    rtas_st(rets, 0, ret);
}

static void rtas_ibm_os_term(PowerPCCPU *cpu,
                            sPAPRMachineState *spapr,
                            uint32_t token, uint32_t nargs,
                            target_ulong args,
                            uint32_t nret, target_ulong rets)
{
    qemu_system_guest_panicked(NULL);

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
}

static void rtas_set_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                                 uint32_t token, uint32_t nargs,
                                 target_ulong args, uint32_t nret,
                                 target_ulong rets)
{
    int32_t power_domain;

    if (nargs != 2 || nret != 2) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }

    /* we currently only use a single, "live insert" powerdomain for
     * hotplugged/dlpar'd resources, so the power is always live/full (100)
     */
    power_domain = rtas_ld(args, 0);
    if (power_domain != -1) {
        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
        return;
    }

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
    rtas_st(rets, 1, 100);
}

static void rtas_get_power_level(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                                  uint32_t token, uint32_t nargs,
                                  target_ulong args, uint32_t nret,
                                  target_ulong rets)
{
    int32_t power_domain;

    if (nargs != 1 || nret != 2) {
        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
        return;
    }

    /* we currently only use a single, "live insert" powerdomain for
     * hotplugged/dlpar'd resources, so the power is always live/full (100)
     */
    power_domain = rtas_ld(args, 0);
    if (power_domain != -1) {
        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
        return;
    }

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);
    rtas_st(rets, 1, 100);
}

static struct rtas_call {
    const char *name;
    spapr_rtas_fn fn;
} rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];

target_ulong spapr_rtas_call(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                             uint32_t token, uint32_t nargs, target_ulong args,
                             uint32_t nret, target_ulong rets)
{
    if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
        struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);

        if (call->fn) {
            call->fn(cpu, spapr, token, nargs, args, nret, rets);
            return H_SUCCESS;
        }
    }

    /* HACK: Some Linux early debug code uses RTAS display-character,
     * but assumes the token value is 0xa (which it is on some real
     * machines) without looking it up in the device tree.  This
     * special case makes this work */
    if (token == 0xa) {
        rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
        return H_SUCCESS;
    }

    hcall_dprintf("Unknown RTAS token 0x%x\n", token);
    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
    return H_PARAMETER;
}

uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
                         uint32_t nret, uint64_t rets)
{
    int token;

    for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
        if (strcmp(cmd, rtas_table[token].name) == 0) {
            sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
            PowerPCCPU *cpu = POWERPC_CPU(first_cpu);

            rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
                                 nargs, args, nret, rets);
            return H_SUCCESS;
        }
    }
    return H_PARAMETER;
}

void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
{
    assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));

    token -= RTAS_TOKEN_BASE;

    assert(!rtas_table[token].name);

    rtas_table[token].name = name;
    rtas_table[token].fn = fn;
}

void spapr_dt_rtas_tokens(void *fdt, int rtas)
{
    int i;

    for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
        struct rtas_call *call = &rtas_table[i];

        if (!call->name) {
            continue;
        }

        _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
    }
}

void spapr_load_rtas(sPAPRMachineState *spapr, void *fdt, hwaddr addr)
{
    int rtas_node;
    int ret;

    /* Copy RTAS blob into guest RAM */
    cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size);

    ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size);
    if (ret < 0) {
        error_report("Couldn't add RTAS reserve entry: %s",
                     fdt_strerror(ret));
        exit(1);
    }

    /* Update the device tree with the blob's location */
    rtas_node = fdt_path_offset(fdt, "/rtas");
    assert(rtas_node >= 0);

    ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr);
    if (ret < 0) {
        error_report("Couldn't add linux,rtas-base property: %s",
                     fdt_strerror(ret));
        exit(1);
    }

    ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr);
    if (ret < 0) {
        error_report("Couldn't add linux,rtas-entry property: %s",
                     fdt_strerror(ret));
        exit(1);
    }

    ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size);
    if (ret < 0) {
        error_report("Couldn't add rtas-size property: %s",
                     fdt_strerror(ret));
        exit(1);
    }
}

static void core_rtas_register_types(void)
{
    spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
                        rtas_display_character);
    spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
    spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
                        rtas_system_reboot);
    spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
                        rtas_query_cpu_stopped_state);
    spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
    spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
    spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
                        "ibm,get-system-parameter",
                        rtas_ibm_get_system_parameter);
    spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
                        "ibm,set-system-parameter",
                        rtas_ibm_set_system_parameter);
    spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
                        rtas_ibm_os_term);
    spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
                        rtas_set_power_level);
    spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
                        rtas_get_power_level);
}

type_init(core_rtas_register_types)