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
28#include "qemu/osdep.h"
29#include "cpu.h"
30#include "qemu/log.h"
31#include "qemu/error-report.h"
32#include "sysemu/sysemu.h"
33#include "sysemu/device_tree.h"
34#include "sysemu/cpus.h"
35#include "sysemu/hw_accel.h"
36#include "sysemu/runstate.h"
37#include "kvm_ppc.h"
38
39#include "hw/ppc/spapr.h"
40#include "hw/ppc/spapr_vio.h"
41#include "hw/ppc/spapr_rtas.h"
42#include "hw/ppc/spapr_cpu_core.h"
43#include "hw/ppc/ppc.h"
44#include "hw/boards.h"
45
46#include <libfdt.h>
47#include "hw/ppc/spapr_drc.h"
48#include "qemu/cutils.h"
49#include "trace.h"
50#include "hw/ppc/fdt.h"
51#include "target/ppc/mmu-hash64.h"
52#include "target/ppc/mmu-book3s-v3.h"
53
54static void rtas_display_character(PowerPCCPU *cpu, SpaprMachineState *spapr,
55 uint32_t token, uint32_t nargs,
56 target_ulong args,
57 uint32_t nret, target_ulong rets)
58{
59 uint8_t c = rtas_ld(args, 0);
60 SpaprVioDevice *sdev = vty_lookup(spapr, 0);
61
62 if (!sdev) {
63 rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
64 } else {
65 vty_putchars(sdev, &c, sizeof(c));
66 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
67 }
68}
69
70static void rtas_power_off(PowerPCCPU *cpu, SpaprMachineState *spapr,
71 uint32_t token, uint32_t nargs, target_ulong args,
72 uint32_t nret, target_ulong rets)
73{
74 if (nargs != 2 || nret != 1) {
75 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
76 return;
77 }
78 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
79 cpu_stop_current();
80 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
81}
82
83static void rtas_system_reboot(PowerPCCPU *cpu, SpaprMachineState *spapr,
84 uint32_t token, uint32_t nargs,
85 target_ulong args,
86 uint32_t nret, target_ulong rets)
87{
88 if (nargs != 0 || nret != 1) {
89 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
90 return;
91 }
92 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
93 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
94}
95
96static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,
97 SpaprMachineState *spapr,
98 uint32_t token, uint32_t nargs,
99 target_ulong args,
100 uint32_t nret, target_ulong rets)
101{
102 target_ulong id;
103 PowerPCCPU *cpu;
104
105 if (nargs != 1 || nret != 2) {
106 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
107 return;
108 }
109
110 id = rtas_ld(args, 0);
111 cpu = spapr_find_cpu(id);
112 if (cpu != NULL) {
113 if (CPU(cpu)->halted) {
114 rtas_st(rets, 1, 0);
115 } else {
116 rtas_st(rets, 1, 2);
117 }
118
119 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
120 return;
121 }
122
123 /* Didn't find a matching cpu */
124 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
125}
126
127static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr,
128 uint32_t token, uint32_t nargs,
129 target_ulong args,
130 uint32_t nret, target_ulong rets)
131{
132 target_ulong id, start, r3;
133 PowerPCCPU *newcpu;
134 CPUPPCState *env;
135 PowerPCCPUClass *pcc;
136 target_ulong lpcr;
137
138 if (nargs != 3 || nret != 1) {
139 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
140 return;
141 }
142
143 id = rtas_ld(args, 0);
144 start = rtas_ld(args, 1);
145 r3 = rtas_ld(args, 2);
146
147 newcpu = spapr_find_cpu(id);
148 if (!newcpu) {
149 /* Didn't find a matching cpu */
150 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
151 return;
152 }
153
154 env = &newcpu->env;
155 pcc = POWERPC_CPU_GET_CLASS(newcpu);
156
157 if (!CPU(newcpu)->halted) {
158 rtas_st(rets, 0, RTAS_OUT_HW_ERROR);
159 return;
160 }
161
162 cpu_synchronize_state(CPU(newcpu));
163
164 env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
165
166 /* Enable Power-saving mode Exit Cause exceptions for the new CPU */
167 lpcr = env->spr[SPR_LPCR];
168 if (!pcc->interrupts_big_endian(callcpu)) {
169 lpcr |= LPCR_ILE;
170 }
171 if (env->mmu_model == POWERPC_MMU_3_00) {
172 /*
173 * New cpus are expected to start in the same radix/hash mode
174 * as the existing CPUs
175 */
176 if (ppc64_v3_radix(callcpu)) {
177 lpcr |= LPCR_UPRT | LPCR_GTSE | LPCR_HR;
178 } else {
179 lpcr &= ~(LPCR_UPRT | LPCR_GTSE | LPCR_HR);
180 }
181 env->spr[SPR_PSSCR] &= ~PSSCR_EC;
182 }
183 ppc_store_lpcr(newcpu, lpcr);
184
185 /*
186 * Set the timebase offset of the new CPU to that of the invoking
187 * CPU. This helps hotplugged CPU to have the correct timebase
188 * offset.
189 */
190 newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
191
192 spapr_cpu_set_entry_state(newcpu, start, r3);
193
194 qemu_cpu_kick(CPU(newcpu));
195
196 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
197}
198
199static void rtas_stop_self(PowerPCCPU *cpu, SpaprMachineState *spapr,
200 uint32_t token, uint32_t nargs,
201 target_ulong args,
202 uint32_t nret, target_ulong rets)
203{
204 CPUState *cs = CPU(cpu);
205 CPUPPCState *env = &cpu->env;
206 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
207
208 /* Disable Power-saving mode Exit Cause exceptions for the CPU.
209 * This could deliver an interrupt on a dying CPU and crash the
210 * guest.
211 * For the same reason, set PSSCR_EC.
212 */
213 ppc_store_lpcr(cpu, env->spr[SPR_LPCR] & ~pcc->lpcr_pm);
214 env->spr[SPR_PSSCR] |= PSSCR_EC;
215 cs->halted = 1;
216 kvmppc_set_reg_ppc_online(cpu, 0);
217 qemu_cpu_kick(cs);
218}
219
220static void rtas_ibm_suspend_me(PowerPCCPU *cpu, SpaprMachineState *spapr,
221 uint32_t token, uint32_t nargs,
222 target_ulong args,
223 uint32_t nret, target_ulong rets)
224{
225 CPUState *cs;
226
227 if (nargs != 0 || nret != 1) {
228 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
229 return;
230 }
231
232 CPU_FOREACH(cs) {
233 PowerPCCPU *c = POWERPC_CPU(cs);
234 CPUPPCState *e = &c->env;
235 if (c == cpu) {
236 continue;
237 }
238
239 /* See h_join */
240 if (!cs->halted || (e->msr & (1ULL << MSR_EE))) {
241 rtas_st(rets, 0, H_MULTI_THREADS_ACTIVE);
242 return;
243 }
244 }
245
246 qemu_system_suspend_request();
247 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
248}
249
250static inline int sysparm_st(target_ulong addr, target_ulong len,
251 const void *val, uint16_t vallen)
252{
253 hwaddr phys = ppc64_phys_to_real(addr);
254
255 if (len < 2) {
256 return RTAS_OUT_SYSPARM_PARAM_ERROR;
257 }
258 stw_be_phys(&address_space_memory, phys, vallen);
259 cpu_physical_memory_write(phys + 2, val, MIN(len - 2, vallen));
260 return RTAS_OUT_SUCCESS;
261}
262
263static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,
264 SpaprMachineState *spapr,
265 uint32_t token, uint32_t nargs,
266 target_ulong args,
267 uint32_t nret, target_ulong rets)
268{
269 PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
270 MachineState *ms = MACHINE(qdev_get_machine());
271 unsigned int max_cpus = ms->smp.max_cpus;
272 target_ulong parameter = rtas_ld(args, 0);
273 target_ulong buffer = rtas_ld(args, 1);
274 target_ulong length = rtas_ld(args, 2);
275 target_ulong ret;
276
277 switch (parameter) {
278 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS: {
279 char *param_val = g_strdup_printf("MaxEntCap=%d,"
280 "DesMem=%" PRIu64 ","
281 "DesProcs=%d,"
282 "MaxPlatProcs=%d",
283 max_cpus,
284 current_machine->ram_size / MiB,
285 ms->smp.cpus,
286 max_cpus);
287 if (pcc->n_host_threads > 0) {
288 char *hostthr_val, *old = param_val;
289
290 /*
291 * Add HostThrs property. This property is not present in PAPR but
292 * is expected by some guests to communicate the number of physical
293 * host threads per core on the system so that they can scale
294 * information which varies based on the thread configuration.
295 */
296 hostthr_val = g_strdup_printf(",HostThrs=%d", pcc->n_host_threads);
297 param_val = g_strconcat(param_val, hostthr_val, NULL);
298 g_free(hostthr_val);
299 g_free(old);
300 }
301 ret = sysparm_st(buffer, length, param_val, strlen(param_val) + 1);
302 g_free(param_val);
303 break;
304 }
305 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE: {
306 uint8_t param_val = DIAGNOSTICS_RUN_MODE_DISABLED;
307
308 ret = sysparm_st(buffer, length, &param_val, sizeof(param_val));
309 break;
310 }
311 case RTAS_SYSPARM_UUID:
312 ret = sysparm_st(buffer, length, (unsigned char *)&qemu_uuid,
313 (qemu_uuid_set ? 16 : 0));
314 break;
315 default:
316 ret = RTAS_OUT_NOT_SUPPORTED;
317 }
318
319 rtas_st(rets, 0, ret);
320}
321
322static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,
323 SpaprMachineState *spapr,
324 uint32_t token, uint32_t nargs,
325 target_ulong args,
326 uint32_t nret, target_ulong rets)
327{
328 target_ulong parameter = rtas_ld(args, 0);
329 target_ulong ret = RTAS_OUT_NOT_SUPPORTED;
330
331 switch (parameter) {
332 case RTAS_SYSPARM_SPLPAR_CHARACTERISTICS:
333 case RTAS_SYSPARM_DIAGNOSTICS_RUN_MODE:
334 case RTAS_SYSPARM_UUID:
335 ret = RTAS_OUT_NOT_AUTHORIZED;
336 break;
337 }
338
339 rtas_st(rets, 0, ret);
340}
341
342static void rtas_ibm_os_term(PowerPCCPU *cpu,
343 SpaprMachineState *spapr,
344 uint32_t token, uint32_t nargs,
345 target_ulong args,
346 uint32_t nret, target_ulong rets)
347{
348 qemu_system_guest_panicked(NULL);
349
350 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
351}
352
353static void rtas_set_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
354 uint32_t token, uint32_t nargs,
355 target_ulong args, uint32_t nret,
356 target_ulong rets)
357{
358 int32_t power_domain;
359
360 if (nargs != 2 || nret != 2) {
361 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
362 return;
363 }
364
365 /* we currently only use a single, "live insert" powerdomain for
366 * hotplugged/dlpar'd resources, so the power is always live/full (100)
367 */
368 power_domain = rtas_ld(args, 0);
369 if (power_domain != -1) {
370 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
371 return;
372 }
373
374 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
375 rtas_st(rets, 1, 100);
376}
377
378static void rtas_get_power_level(PowerPCCPU *cpu, SpaprMachineState *spapr,
379 uint32_t token, uint32_t nargs,
380 target_ulong args, uint32_t nret,
381 target_ulong rets)
382{
383 int32_t power_domain;
384
385 if (nargs != 1 || nret != 2) {
386 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
387 return;
388 }
389
390 /* we currently only use a single, "live insert" powerdomain for
391 * hotplugged/dlpar'd resources, so the power is always live/full (100)
392 */
393 power_domain = rtas_ld(args, 0);
394 if (power_domain != -1) {
395 rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);
396 return;
397 }
398
399 rtas_st(rets, 0, RTAS_OUT_SUCCESS);
400 rtas_st(rets, 1, 100);
401}
402
403static struct rtas_call {
404 const char *name;
405 spapr_rtas_fn fn;
406} rtas_table[RTAS_TOKEN_MAX - RTAS_TOKEN_BASE];
407
408target_ulong spapr_rtas_call(PowerPCCPU *cpu, SpaprMachineState *spapr,
409 uint32_t token, uint32_t nargs, target_ulong args,
410 uint32_t nret, target_ulong rets)
411{
412 if ((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX)) {
413 struct rtas_call *call = rtas_table + (token - RTAS_TOKEN_BASE);
414
415 if (call->fn) {
416 call->fn(cpu, spapr, token, nargs, args, nret, rets);
417 return H_SUCCESS;
418 }
419 }
420
421 /* HACK: Some Linux early debug code uses RTAS display-character,
422 * but assumes the token value is 0xa (which it is on some real
423 * machines) without looking it up in the device tree. This
424 * special case makes this work */
425 if (token == 0xa) {
426 rtas_display_character(cpu, spapr, 0xa, nargs, args, nret, rets);
427 return H_SUCCESS;
428 }
429
430 hcall_dprintf("Unknown RTAS token 0x%x\n", token);
431 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);
432 return H_PARAMETER;
433}
434
435uint64_t qtest_rtas_call(char *cmd, uint32_t nargs, uint64_t args,
436 uint32_t nret, uint64_t rets)
437{
438 int token;
439
440 for (token = 0; token < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; token++) {
441 if (strcmp(cmd, rtas_table[token].name) == 0) {
442 SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
443 PowerPCCPU *cpu = POWERPC_CPU(first_cpu);
444
445 rtas_table[token].fn(cpu, spapr, token + RTAS_TOKEN_BASE,
446 nargs, args, nret, rets);
447 return H_SUCCESS;
448 }
449 }
450 return H_PARAMETER;
451}
452
453void spapr_rtas_register(int token, const char *name, spapr_rtas_fn fn)
454{
455 assert((token >= RTAS_TOKEN_BASE) && (token < RTAS_TOKEN_MAX));
456
457 token -= RTAS_TOKEN_BASE;
458
459 assert(!name || !rtas_table[token].name);
460
461 rtas_table[token].name = name;
462 rtas_table[token].fn = fn;
463}
464
465void spapr_dt_rtas_tokens(void *fdt, int rtas)
466{
467 int i;
468
469 for (i = 0; i < RTAS_TOKEN_MAX - RTAS_TOKEN_BASE; i++) {
470 struct rtas_call *call = &rtas_table[i];
471
472 if (!call->name) {
473 continue;
474 }
475
476 _FDT(fdt_setprop_cell(fdt, rtas, call->name, i + RTAS_TOKEN_BASE));
477 }
478}
479
480void spapr_load_rtas(SpaprMachineState *spapr, void *fdt, hwaddr addr)
481{
482 int rtas_node;
483 int ret;
484
485 /* Copy RTAS blob into guest RAM */
486 cpu_physical_memory_write(addr, spapr->rtas_blob, spapr->rtas_size);
487
488 ret = fdt_add_mem_rsv(fdt, addr, spapr->rtas_size);
489 if (ret < 0) {
490 error_report("Couldn't add RTAS reserve entry: %s",
491 fdt_strerror(ret));
492 exit(1);
493 }
494
495 /* Update the device tree with the blob's location */
496 rtas_node = fdt_path_offset(fdt, "/rtas");
497 assert(rtas_node >= 0);
498
499 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-base", addr);
500 if (ret < 0) {
501 error_report("Couldn't add linux,rtas-base property: %s",
502 fdt_strerror(ret));
503 exit(1);
504 }
505
506 ret = fdt_setprop_cell(fdt, rtas_node, "linux,rtas-entry", addr);
507 if (ret < 0) {
508 error_report("Couldn't add linux,rtas-entry property: %s",
509 fdt_strerror(ret));
510 exit(1);
511 }
512
513 ret = fdt_setprop_cell(fdt, rtas_node, "rtas-size", spapr->rtas_size);
514 if (ret < 0) {
515 error_report("Couldn't add rtas-size property: %s",
516 fdt_strerror(ret));
517 exit(1);
518 }
519}
520
521static void core_rtas_register_types(void)
522{
523 spapr_rtas_register(RTAS_DISPLAY_CHARACTER, "display-character",
524 rtas_display_character);
525 spapr_rtas_register(RTAS_POWER_OFF, "power-off", rtas_power_off);
526 spapr_rtas_register(RTAS_SYSTEM_REBOOT, "system-reboot",
527 rtas_system_reboot);
528 spapr_rtas_register(RTAS_QUERY_CPU_STOPPED_STATE, "query-cpu-stopped-state",
529 rtas_query_cpu_stopped_state);
530 spapr_rtas_register(RTAS_START_CPU, "start-cpu", rtas_start_cpu);
531 spapr_rtas_register(RTAS_STOP_SELF, "stop-self", rtas_stop_self);
532 spapr_rtas_register(RTAS_IBM_SUSPEND_ME, "ibm,suspend-me",
533 rtas_ibm_suspend_me);
534 spapr_rtas_register(RTAS_IBM_GET_SYSTEM_PARAMETER,
535 "ibm,get-system-parameter",
536 rtas_ibm_get_system_parameter);
537 spapr_rtas_register(RTAS_IBM_SET_SYSTEM_PARAMETER,
538 "ibm,set-system-parameter",
539 rtas_ibm_set_system_parameter);
540 spapr_rtas_register(RTAS_IBM_OS_TERM, "ibm,os-term",
541 rtas_ibm_os_term);
542 spapr_rtas_register(RTAS_SET_POWER_LEVEL, "set-power-level",
543 rtas_set_power_level);
544 spapr_rtas_register(RTAS_GET_POWER_LEVEL, "get-power-level",
545 rtas_get_power_level);
546}
547
548type_init(core_rtas_register_types)
549