1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright (C) 2015 ARM Limited
5 */
6
7 #define pr_fmt(fmt) "psci: " fmt
8
9 #include <linux/acpi.h>
10 #include <linux/arm-smccc.h>
11 #include <linux/cpuidle.h>
12 #include <linux/debugfs.h>
13 #include <linux/errno.h>
14 #include <linux/linkage.h>
15 #include <linux/of.h>
16 #include <linux/pm.h>
17 #include <linux/printk.h>
18 #include <linux/psci.h>
19 #include <linux/reboot.h>
20 #include <linux/slab.h>
21 #include <linux/suspend.h>
22
23 #include <uapi/linux/psci.h>
24
25 #include <asm/cpuidle.h>
26 #include <asm/cputype.h>
27 #include <asm/hypervisor.h>
28 #include <asm/system_misc.h>
29 #include <asm/smp_plat.h>
30 #include <asm/suspend.h>
31
32 /*
33 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
34 * calls it is necessary to use SMC64 to pass or return 64-bit values.
35 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
36 * (native-width) function ID.
37 */
38 #ifdef CONFIG_64BIT
39 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
40 #else
41 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
42 #endif
43
44 /*
45 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
46 * calls to its resident CPU, so we must avoid issuing those. We never migrate
47 * a Trusted OS even if it claims to be capable of migration -- doing so will
48 * require cooperation with a Trusted OS driver.
49 */
50 static int resident_cpu = -1;
51 struct psci_operations psci_ops;
52 static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;
53
psci_tos_resident_on(int cpu)54 bool psci_tos_resident_on(int cpu)
55 {
56 return cpu == resident_cpu;
57 }
58
59 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
60 unsigned long, unsigned long);
61 static psci_fn *invoke_psci_fn;
62
63 static struct psci_0_1_function_ids psci_0_1_function_ids;
64
get_psci_0_1_function_ids(void)65 struct psci_0_1_function_ids get_psci_0_1_function_ids(void)
66 {
67 return psci_0_1_function_ids;
68 }
69
70 #define PSCI_0_2_POWER_STATE_MASK \
71 (PSCI_0_2_POWER_STATE_ID_MASK | \
72 PSCI_0_2_POWER_STATE_TYPE_MASK | \
73 PSCI_0_2_POWER_STATE_AFFL_MASK)
74
75 #define PSCI_1_0_EXT_POWER_STATE_MASK \
76 (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
77 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
78
79 static u32 psci_cpu_suspend_feature;
80 static bool psci_system_reset2_supported;
81
psci_has_ext_power_state(void)82 static inline bool psci_has_ext_power_state(void)
83 {
84 return psci_cpu_suspend_feature &
85 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
86 }
87
psci_has_osi_support(void)88 bool psci_has_osi_support(void)
89 {
90 return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
91 }
92
psci_power_state_loses_context(u32 state)93 static inline bool psci_power_state_loses_context(u32 state)
94 {
95 const u32 mask = psci_has_ext_power_state() ?
96 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
97 PSCI_0_2_POWER_STATE_TYPE_MASK;
98
99 return state & mask;
100 }
101
psci_power_state_is_valid(u32 state)102 bool psci_power_state_is_valid(u32 state)
103 {
104 const u32 valid_mask = psci_has_ext_power_state() ?
105 PSCI_1_0_EXT_POWER_STATE_MASK :
106 PSCI_0_2_POWER_STATE_MASK;
107
108 return !(state & ~valid_mask);
109 }
110
111 static __always_inline unsigned long
__invoke_psci_fn_hvc(unsigned long function_id,unsigned long arg0,unsigned long arg1,unsigned long arg2)112 __invoke_psci_fn_hvc(unsigned long function_id,
113 unsigned long arg0, unsigned long arg1,
114 unsigned long arg2)
115 {
116 struct arm_smccc_res res;
117
118 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
119 return res.a0;
120 }
121
122 static __always_inline unsigned long
__invoke_psci_fn_smc(unsigned long function_id,unsigned long arg0,unsigned long arg1,unsigned long arg2)123 __invoke_psci_fn_smc(unsigned long function_id,
124 unsigned long arg0, unsigned long arg1,
125 unsigned long arg2)
126 {
127 struct arm_smccc_res res;
128
129 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
130 return res.a0;
131 }
132
psci_to_linux_errno(int errno)133 static __always_inline int psci_to_linux_errno(int errno)
134 {
135 switch (errno) {
136 case PSCI_RET_SUCCESS:
137 return 0;
138 case PSCI_RET_NOT_SUPPORTED:
139 return -EOPNOTSUPP;
140 case PSCI_RET_INVALID_PARAMS:
141 case PSCI_RET_INVALID_ADDRESS:
142 return -EINVAL;
143 case PSCI_RET_DENIED:
144 return -EPERM;
145 }
146
147 return -EINVAL;
148 }
149
psci_0_1_get_version(void)150 static u32 psci_0_1_get_version(void)
151 {
152 return PSCI_VERSION(0, 1);
153 }
154
psci_0_2_get_version(void)155 static u32 psci_0_2_get_version(void)
156 {
157 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
158 }
159
psci_set_osi_mode(bool enable)160 int psci_set_osi_mode(bool enable)
161 {
162 unsigned long suspend_mode;
163 int err;
164
165 suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :
166 PSCI_1_0_SUSPEND_MODE_PC;
167
168 err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
169 if (err < 0)
170 pr_info(FW_BUG "failed to set %s mode: %d\n",
171 enable ? "OSI" : "PC", err);
172 return psci_to_linux_errno(err);
173 }
174
175 static __always_inline int
__psci_cpu_suspend(u32 fn,u32 state,unsigned long entry_point)176 __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
177 {
178 int err;
179
180 err = invoke_psci_fn(fn, state, entry_point, 0);
181 return psci_to_linux_errno(err);
182 }
183
184 static __always_inline int
psci_0_1_cpu_suspend(u32 state,unsigned long entry_point)185 psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
186 {
187 return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
188 state, entry_point);
189 }
190
191 static __always_inline int
psci_0_2_cpu_suspend(u32 state,unsigned long entry_point)192 psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
193 {
194 return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
195 state, entry_point);
196 }
197
__psci_cpu_off(u32 fn,u32 state)198 static int __psci_cpu_off(u32 fn, u32 state)
199 {
200 int err;
201
202 err = invoke_psci_fn(fn, state, 0, 0);
203 return psci_to_linux_errno(err);
204 }
205
psci_0_1_cpu_off(u32 state)206 static int psci_0_1_cpu_off(u32 state)
207 {
208 return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
209 }
210
psci_0_2_cpu_off(u32 state)211 static int psci_0_2_cpu_off(u32 state)
212 {
213 return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
214 }
215
__psci_cpu_on(u32 fn,unsigned long cpuid,unsigned long entry_point)216 static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
217 {
218 int err;
219
220 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
221 return psci_to_linux_errno(err);
222 }
223
psci_0_1_cpu_on(unsigned long cpuid,unsigned long entry_point)224 static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
225 {
226 return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
227 }
228
psci_0_2_cpu_on(unsigned long cpuid,unsigned long entry_point)229 static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
230 {
231 return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
232 }
233
__psci_migrate(u32 fn,unsigned long cpuid)234 static int __psci_migrate(u32 fn, unsigned long cpuid)
235 {
236 int err;
237
238 err = invoke_psci_fn(fn, cpuid, 0, 0);
239 return psci_to_linux_errno(err);
240 }
241
psci_0_1_migrate(unsigned long cpuid)242 static int psci_0_1_migrate(unsigned long cpuid)
243 {
244 return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
245 }
246
psci_0_2_migrate(unsigned long cpuid)247 static int psci_0_2_migrate(unsigned long cpuid)
248 {
249 return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
250 }
251
psci_affinity_info(unsigned long target_affinity,unsigned long lowest_affinity_level)252 static int psci_affinity_info(unsigned long target_affinity,
253 unsigned long lowest_affinity_level)
254 {
255 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
256 target_affinity, lowest_affinity_level, 0);
257 }
258
psci_migrate_info_type(void)259 static int psci_migrate_info_type(void)
260 {
261 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
262 }
263
psci_migrate_info_up_cpu(void)264 static unsigned long psci_migrate_info_up_cpu(void)
265 {
266 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
267 0, 0, 0);
268 }
269
set_conduit(enum arm_smccc_conduit conduit)270 static void set_conduit(enum arm_smccc_conduit conduit)
271 {
272 switch (conduit) {
273 case SMCCC_CONDUIT_HVC:
274 invoke_psci_fn = __invoke_psci_fn_hvc;
275 break;
276 case SMCCC_CONDUIT_SMC:
277 invoke_psci_fn = __invoke_psci_fn_smc;
278 break;
279 default:
280 WARN(1, "Unexpected PSCI conduit %d\n", conduit);
281 }
282
283 psci_conduit = conduit;
284 }
285
get_set_conduit_method(const struct device_node * np)286 static int get_set_conduit_method(const struct device_node *np)
287 {
288 const char *method;
289
290 pr_info("probing for conduit method from DT.\n");
291
292 if (of_property_read_string(np, "method", &method)) {
293 pr_warn("missing \"method\" property\n");
294 return -ENXIO;
295 }
296
297 if (!strcmp("hvc", method)) {
298 set_conduit(SMCCC_CONDUIT_HVC);
299 } else if (!strcmp("smc", method)) {
300 set_conduit(SMCCC_CONDUIT_SMC);
301 } else {
302 pr_warn("invalid \"method\" property: %s\n", method);
303 return -EINVAL;
304 }
305 return 0;
306 }
307
psci_sys_reset(struct notifier_block * nb,unsigned long action,void * data)308 static int psci_sys_reset(struct notifier_block *nb, unsigned long action,
309 void *data)
310 {
311 if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
312 psci_system_reset2_supported) {
313 /*
314 * reset_type[31] = 0 (architectural)
315 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
316 * cookie = 0 (ignored by the implementation)
317 */
318 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
319 } else {
320 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
321 }
322
323 return NOTIFY_DONE;
324 }
325
326 static struct notifier_block psci_sys_reset_nb = {
327 .notifier_call = psci_sys_reset,
328 .priority = 129,
329 };
330
psci_sys_poweroff(void)331 static void psci_sys_poweroff(void)
332 {
333 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
334 }
335
psci_features(u32 psci_func_id)336 static int psci_features(u32 psci_func_id)
337 {
338 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
339 psci_func_id, 0, 0);
340 }
341
342 #ifdef CONFIG_DEBUG_FS
343
344 #define PSCI_ID(ver, _name) \
345 { .fn = PSCI_##ver##_FN_##_name, .name = #_name, }
346 #define PSCI_ID_NATIVE(ver, _name) \
347 { .fn = PSCI_FN_NATIVE(ver, _name), .name = #_name, }
348
349 /* A table of all optional functions */
350 static const struct {
351 u32 fn;
352 const char *name;
353 } psci_fn_ids[] = {
354 PSCI_ID_NATIVE(0_2, MIGRATE),
355 PSCI_ID(0_2, MIGRATE_INFO_TYPE),
356 PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
357 PSCI_ID(1_0, CPU_FREEZE),
358 PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),
359 PSCI_ID_NATIVE(1_0, NODE_HW_STATE),
360 PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),
361 PSCI_ID(1_0, SET_SUSPEND_MODE),
362 PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),
363 PSCI_ID_NATIVE(1_0, STAT_COUNT),
364 PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),
365 PSCI_ID(1_1, MEM_PROTECT),
366 PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),
367 };
368
psci_debugfs_read(struct seq_file * s,void * data)369 static int psci_debugfs_read(struct seq_file *s, void *data)
370 {
371 int feature, type, i;
372 u32 ver;
373
374 ver = psci_ops.get_version();
375 seq_printf(s, "PSCIv%d.%d\n",
376 PSCI_VERSION_MAJOR(ver),
377 PSCI_VERSION_MINOR(ver));
378
379 /* PSCI_FEATURES is available only starting from 1.0 */
380 if (PSCI_VERSION_MAJOR(ver) < 1)
381 return 0;
382
383 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
384 if (feature != PSCI_RET_NOT_SUPPORTED) {
385 ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
386 seq_printf(s, "SMC Calling Convention v%d.%d\n",
387 PSCI_VERSION_MAJOR(ver),
388 PSCI_VERSION_MINOR(ver));
389 } else {
390 seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");
391 }
392
393 feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
394 if (feature < 0) {
395 seq_printf(s, "PSCI_FEATURES(CPU_SUSPEND) error (%d)\n", feature);
396 } else {
397 seq_printf(s, "OSI is %ssupported\n",
398 (feature & BIT(0)) ? "" : "not ");
399 seq_printf(s, "%s StateID format is used\n",
400 (feature & BIT(1)) ? "Extended" : "Original");
401 }
402
403 type = psci_ops.migrate_info_type();
404 if (type == PSCI_0_2_TOS_UP_MIGRATE ||
405 type == PSCI_0_2_TOS_UP_NO_MIGRATE) {
406 unsigned long cpuid;
407
408 seq_printf(s, "Trusted OS %smigrate capable\n",
409 type == PSCI_0_2_TOS_UP_NO_MIGRATE ? "not " : "");
410 cpuid = psci_migrate_info_up_cpu();
411 seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",
412 cpuid, resident_cpu);
413 } else if (type == PSCI_0_2_TOS_MP) {
414 seq_puts(s, "Trusted OS migration not required\n");
415 } else {
416 if (type != PSCI_RET_NOT_SUPPORTED)
417 seq_printf(s, "MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
418 }
419
420 for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {
421 feature = psci_features(psci_fn_ids[i].fn);
422 if (feature == PSCI_RET_NOT_SUPPORTED)
423 continue;
424 if (feature < 0)
425 seq_printf(s, "PSCI_FEATURES(%s) error (%d)\n",
426 psci_fn_ids[i].name, feature);
427 else
428 seq_printf(s, "%s is supported\n", psci_fn_ids[i].name);
429 }
430
431 return 0;
432 }
433
psci_debugfs_open(struct inode * inode,struct file * f)434 static int psci_debugfs_open(struct inode *inode, struct file *f)
435 {
436 return single_open(f, psci_debugfs_read, NULL);
437 }
438
439 static const struct file_operations psci_debugfs_ops = {
440 .owner = THIS_MODULE,
441 .open = psci_debugfs_open,
442 .release = single_release,
443 .read = seq_read,
444 .llseek = seq_lseek
445 };
446
psci_debugfs_init(void)447 static int __init psci_debugfs_init(void)
448 {
449 if (!invoke_psci_fn || !psci_ops.get_version)
450 return 0;
451
452 return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,
453 &psci_debugfs_ops));
454 }
late_initcall(psci_debugfs_init)455 late_initcall(psci_debugfs_init)
456 #endif
457
458 #ifdef CONFIG_CPU_IDLE
459 static noinstr int psci_suspend_finisher(unsigned long state)
460 {
461 u32 power_state = state;
462 phys_addr_t pa_cpu_resume;
463
464 pa_cpu_resume = __pa_symbol_nodebug((unsigned long)cpu_resume);
465
466 return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
467 }
468
psci_cpu_suspend_enter(u32 state)469 int psci_cpu_suspend_enter(u32 state)
470 {
471 int ret;
472
473 if (!psci_power_state_loses_context(state)) {
474 struct arm_cpuidle_irq_context context;
475
476 ct_cpuidle_enter();
477 arm_cpuidle_save_irq_context(&context);
478 ret = psci_ops.cpu_suspend(state, 0);
479 arm_cpuidle_restore_irq_context(&context);
480 ct_cpuidle_exit();
481 } else {
482 /*
483 * ARM64 cpu_suspend() wants to do ct_cpuidle_*() itself.
484 */
485 if (!IS_ENABLED(CONFIG_ARM64))
486 ct_cpuidle_enter();
487
488 ret = cpu_suspend(state, psci_suspend_finisher);
489
490 if (!IS_ENABLED(CONFIG_ARM64))
491 ct_cpuidle_exit();
492 }
493
494 return ret;
495 }
496 #endif
497
psci_system_suspend(unsigned long unused)498 static int psci_system_suspend(unsigned long unused)
499 {
500 int err;
501 phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);
502
503 err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
504 pa_cpu_resume, 0, 0);
505 return psci_to_linux_errno(err);
506 }
507
psci_system_suspend_enter(suspend_state_t state)508 static int psci_system_suspend_enter(suspend_state_t state)
509 {
510 return cpu_suspend(0, psci_system_suspend);
511 }
512
513 static const struct platform_suspend_ops psci_suspend_ops = {
514 .valid = suspend_valid_only_mem,
515 .enter = psci_system_suspend_enter,
516 };
517
psci_init_system_reset2(void)518 static void __init psci_init_system_reset2(void)
519 {
520 int ret;
521
522 ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
523
524 if (ret != PSCI_RET_NOT_SUPPORTED)
525 psci_system_reset2_supported = true;
526 }
527
psci_init_system_suspend(void)528 static void __init psci_init_system_suspend(void)
529 {
530 int ret;
531
532 if (!IS_ENABLED(CONFIG_SUSPEND))
533 return;
534
535 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
536
537 if (ret != PSCI_RET_NOT_SUPPORTED)
538 suspend_set_ops(&psci_suspend_ops);
539 }
540
psci_init_cpu_suspend(void)541 static void __init psci_init_cpu_suspend(void)
542 {
543 int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
544
545 if (feature != PSCI_RET_NOT_SUPPORTED)
546 psci_cpu_suspend_feature = feature;
547 }
548
549 /*
550 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
551 * return DENIED (which would be fatal).
552 */
psci_init_migrate(void)553 static void __init psci_init_migrate(void)
554 {
555 unsigned long cpuid;
556 int type, cpu = -1;
557
558 type = psci_ops.migrate_info_type();
559
560 if (type == PSCI_0_2_TOS_MP) {
561 pr_info("Trusted OS migration not required\n");
562 return;
563 }
564
565 if (type == PSCI_RET_NOT_SUPPORTED) {
566 pr_info("MIGRATE_INFO_TYPE not supported.\n");
567 return;
568 }
569
570 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
571 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
572 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
573 return;
574 }
575
576 cpuid = psci_migrate_info_up_cpu();
577 if (cpuid & ~MPIDR_HWID_BITMASK) {
578 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
579 cpuid);
580 return;
581 }
582
583 cpu = get_logical_index(cpuid);
584 resident_cpu = cpu >= 0 ? cpu : -1;
585
586 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
587 }
588
psci_init_smccc(void)589 static void __init psci_init_smccc(void)
590 {
591 u32 ver = ARM_SMCCC_VERSION_1_0;
592 int feature;
593
594 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
595
596 if (feature != PSCI_RET_NOT_SUPPORTED) {
597 u32 ret;
598 ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
599 if (ret >= ARM_SMCCC_VERSION_1_1) {
600 arm_smccc_version_init(ret, psci_conduit);
601 ver = ret;
602 }
603 }
604
605 /*
606 * Conveniently, the SMCCC and PSCI versions are encoded the
607 * same way. No, this isn't accidental.
608 */
609 pr_info("SMC Calling Convention v%d.%d\n",
610 PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver));
611
612 }
613
psci_0_2_set_functions(void)614 static void __init psci_0_2_set_functions(void)
615 {
616 pr_info("Using standard PSCI v0.2 function IDs\n");
617
618 psci_ops = (struct psci_operations){
619 .get_version = psci_0_2_get_version,
620 .cpu_suspend = psci_0_2_cpu_suspend,
621 .cpu_off = psci_0_2_cpu_off,
622 .cpu_on = psci_0_2_cpu_on,
623 .migrate = psci_0_2_migrate,
624 .affinity_info = psci_affinity_info,
625 .migrate_info_type = psci_migrate_info_type,
626 };
627
628 register_restart_handler(&psci_sys_reset_nb);
629
630 pm_power_off = psci_sys_poweroff;
631 }
632
633 /*
634 * Probe function for PSCI firmware versions >= 0.2
635 */
psci_probe(void)636 static int __init psci_probe(void)
637 {
638 u32 ver = psci_0_2_get_version();
639
640 pr_info("PSCIv%d.%d detected in firmware.\n",
641 PSCI_VERSION_MAJOR(ver),
642 PSCI_VERSION_MINOR(ver));
643
644 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
645 pr_err("Conflicting PSCI version detected.\n");
646 return -EINVAL;
647 }
648
649 psci_0_2_set_functions();
650
651 psci_init_migrate();
652
653 if (PSCI_VERSION_MAJOR(ver) >= 1) {
654 psci_init_smccc();
655 psci_init_cpu_suspend();
656 psci_init_system_suspend();
657 psci_init_system_reset2();
658 kvm_init_hyp_services();
659 }
660
661 return 0;
662 }
663
664 typedef int (*psci_initcall_t)(const struct device_node *);
665
666 /*
667 * PSCI init function for PSCI versions >=0.2
668 *
669 * Probe based on PSCI PSCI_VERSION function
670 */
psci_0_2_init(const struct device_node * np)671 static int __init psci_0_2_init(const struct device_node *np)
672 {
673 int err;
674
675 err = get_set_conduit_method(np);
676 if (err)
677 return err;
678
679 /*
680 * Starting with v0.2, the PSCI specification introduced a call
681 * (PSCI_VERSION) that allows probing the firmware version, so
682 * that PSCI function IDs and version specific initialization
683 * can be carried out according to the specific version reported
684 * by firmware
685 */
686 return psci_probe();
687 }
688
689 /*
690 * PSCI < v0.2 get PSCI Function IDs via DT.
691 */
psci_0_1_init(const struct device_node * np)692 static int __init psci_0_1_init(const struct device_node *np)
693 {
694 u32 id;
695 int err;
696
697 err = get_set_conduit_method(np);
698 if (err)
699 return err;
700
701 pr_info("Using PSCI v0.1 Function IDs from DT\n");
702
703 psci_ops.get_version = psci_0_1_get_version;
704
705 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
706 psci_0_1_function_ids.cpu_suspend = id;
707 psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
708 }
709
710 if (!of_property_read_u32(np, "cpu_off", &id)) {
711 psci_0_1_function_ids.cpu_off = id;
712 psci_ops.cpu_off = psci_0_1_cpu_off;
713 }
714
715 if (!of_property_read_u32(np, "cpu_on", &id)) {
716 psci_0_1_function_ids.cpu_on = id;
717 psci_ops.cpu_on = psci_0_1_cpu_on;
718 }
719
720 if (!of_property_read_u32(np, "migrate", &id)) {
721 psci_0_1_function_ids.migrate = id;
722 psci_ops.migrate = psci_0_1_migrate;
723 }
724
725 return 0;
726 }
727
psci_1_0_init(const struct device_node * np)728 static int __init psci_1_0_init(const struct device_node *np)
729 {
730 int err;
731
732 err = psci_0_2_init(np);
733 if (err)
734 return err;
735
736 if (psci_has_osi_support()) {
737 pr_info("OSI mode supported.\n");
738
739 /* Default to PC mode. */
740 psci_set_osi_mode(false);
741 }
742
743 return 0;
744 }
745
746 static const struct of_device_id psci_of_match[] __initconst = {
747 { .compatible = "arm,psci", .data = psci_0_1_init},
748 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
749 { .compatible = "arm,psci-1.0", .data = psci_1_0_init},
750 {},
751 };
752
psci_dt_init(void)753 int __init psci_dt_init(void)
754 {
755 struct device_node *np;
756 const struct of_device_id *matched_np;
757 psci_initcall_t init_fn;
758 int ret;
759
760 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
761
762 if (!np || !of_device_is_available(np))
763 return -ENODEV;
764
765 init_fn = (psci_initcall_t)matched_np->data;
766 ret = init_fn(np);
767
768 of_node_put(np);
769 return ret;
770 }
771
772 #ifdef CONFIG_ACPI
773 /*
774 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
775 * explicitly clarified in SBBR
776 */
psci_acpi_init(void)777 int __init psci_acpi_init(void)
778 {
779 if (!acpi_psci_present()) {
780 pr_info("is not implemented in ACPI.\n");
781 return -EOPNOTSUPP;
782 }
783
784 pr_info("probing for conduit method from ACPI.\n");
785
786 if (acpi_psci_use_hvc())
787 set_conduit(SMCCC_CONDUIT_HVC);
788 else
789 set_conduit(SMCCC_CONDUIT_SMC);
790
791 return psci_probe();
792 }
793 #endif
794