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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 */
50static int resident_cpu = -1;
51struct psci_operations psci_ops;
52static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;
53
54bool psci_tos_resident_on(int cpu)
55{
56 return cpu == resident_cpu;
57}
58
59typedef unsigned long (psci_fn)(unsigned long, unsigned long,
60 unsigned long, unsigned long);
61static psci_fn *invoke_psci_fn;
62
63static struct psci_0_1_function_ids psci_0_1_function_ids;
64
65struct 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
79static u32 psci_cpu_suspend_feature;
80static bool psci_system_reset2_supported;
81static bool psci_system_off2_hibernate_supported;
82
83static inline bool psci_has_ext_power_state(void)
84{
85 return psci_cpu_suspend_feature &
86 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
87}
88
89bool psci_has_osi_support(void)
90{
91 return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
92}
93
94static inline bool psci_power_state_loses_context(u32 state)
95{
96 const u32 mask = psci_has_ext_power_state() ?
97 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
98 PSCI_0_2_POWER_STATE_TYPE_MASK;
99
100 return state & mask;
101}
102
103bool psci_power_state_is_valid(u32 state)
104{
105 const u32 valid_mask = psci_has_ext_power_state() ?
106 PSCI_1_0_EXT_POWER_STATE_MASK :
107 PSCI_0_2_POWER_STATE_MASK;
108
109 return !(state & ~valid_mask);
110}
111
112static __always_inline unsigned long
113__invoke_psci_fn_hvc(unsigned long function_id,
114 unsigned long arg0, unsigned long arg1,
115 unsigned long arg2)
116{
117 struct arm_smccc_res res;
118
119 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
120 return res.a0;
121}
122
123static __always_inline unsigned long
124__invoke_psci_fn_smc(unsigned long function_id,
125 unsigned long arg0, unsigned long arg1,
126 unsigned long arg2)
127{
128 struct arm_smccc_res res;
129
130 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
131 return res.a0;
132}
133
134static __always_inline int psci_to_linux_errno(int errno)
135{
136 switch (errno) {
137 case PSCI_RET_SUCCESS:
138 return 0;
139 case PSCI_RET_NOT_SUPPORTED:
140 return -EOPNOTSUPP;
141 case PSCI_RET_INVALID_PARAMS:
142 case PSCI_RET_INVALID_ADDRESS:
143 return -EINVAL;
144 case PSCI_RET_DENIED:
145 return -EPERM;
146 }
147
148 return -EINVAL;
149}
150
151static u32 psci_0_1_get_version(void)
152{
153 return PSCI_VERSION(0, 1);
154}
155
156static u32 psci_0_2_get_version(void)
157{
158 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
159}
160
161int psci_set_osi_mode(bool enable)
162{
163 unsigned long suspend_mode;
164 int err;
165
166 suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :
167 PSCI_1_0_SUSPEND_MODE_PC;
168
169 err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
170 if (err < 0)
171 pr_info(FW_BUG "failed to set %s mode: %d\n",
172 enable ? "OSI" : "PC", err);
173 return psci_to_linux_errno(err);
174}
175
176static __always_inline int
177__psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
178{
179 int err;
180
181 err = invoke_psci_fn(fn, state, entry_point, 0);
182 return psci_to_linux_errno(err);
183}
184
185static __always_inline int
186psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
187{
188 return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
189 state, entry_point);
190}
191
192static __always_inline int
193psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
194{
195 return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
196 state, entry_point);
197}
198
199static int __psci_cpu_off(u32 fn, u32 state)
200{
201 int err;
202
203 err = invoke_psci_fn(fn, state, 0, 0);
204 return psci_to_linux_errno(err);
205}
206
207static int psci_0_1_cpu_off(u32 state)
208{
209 return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
210}
211
212static int psci_0_2_cpu_off(u32 state)
213{
214 return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
215}
216
217static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
218{
219 int err;
220
221 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
222 return psci_to_linux_errno(err);
223}
224
225static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
226{
227 return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
228}
229
230static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
231{
232 return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
233}
234
235static int __psci_migrate(u32 fn, unsigned long cpuid)
236{
237 int err;
238
239 err = invoke_psci_fn(fn, cpuid, 0, 0);
240 return psci_to_linux_errno(err);
241}
242
243static int psci_0_1_migrate(unsigned long cpuid)
244{
245 return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
246}
247
248static int psci_0_2_migrate(unsigned long cpuid)
249{
250 return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
251}
252
253static int psci_affinity_info(unsigned long target_affinity,
254 unsigned long lowest_affinity_level)
255{
256 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
257 target_affinity, lowest_affinity_level, 0);
258}
259
260static int psci_migrate_info_type(void)
261{
262 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
263}
264
265static unsigned long psci_migrate_info_up_cpu(void)
266{
267 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
268 0, 0, 0);
269}
270
271static void set_conduit(enum arm_smccc_conduit conduit)
272{
273 switch (conduit) {
274 case SMCCC_CONDUIT_HVC:
275 invoke_psci_fn = __invoke_psci_fn_hvc;
276 break;
277 case SMCCC_CONDUIT_SMC:
278 invoke_psci_fn = __invoke_psci_fn_smc;
279 break;
280 default:
281 WARN(1, "Unexpected PSCI conduit %d\n", conduit);
282 }
283
284 psci_conduit = conduit;
285}
286
287static int get_set_conduit_method(const struct device_node *np)
288{
289 const char *method;
290
291 pr_info("probing for conduit method from DT.\n");
292
293 if (of_property_read_string(np, "method", &method)) {
294 pr_warn("missing \"method\" property\n");
295 return -ENXIO;
296 }
297
298 if (!strcmp("hvc", method)) {
299 set_conduit(SMCCC_CONDUIT_HVC);
300 } else if (!strcmp("smc", method)) {
301 set_conduit(SMCCC_CONDUIT_SMC);
302 } else {
303 pr_warn("invalid \"method\" property: %s\n", method);
304 return -EINVAL;
305 }
306 return 0;
307}
308
309static int psci_sys_reset(struct notifier_block *nb, unsigned long action,
310 void *data)
311{
312 if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
313 psci_system_reset2_supported) {
314 /*
315 * reset_type[31] = 0 (architectural)
316 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
317 * cookie = 0 (ignored by the implementation)
318 */
319 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
320 } else {
321 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
322 }
323
324 return NOTIFY_DONE;
325}
326
327static struct notifier_block psci_sys_reset_nb = {
328 .notifier_call = psci_sys_reset,
329 .priority = 129,
330};
331
332static void psci_sys_poweroff(void)
333{
334 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
335}
336
337#ifdef CONFIG_HIBERNATION
338static int psci_sys_hibernate(struct sys_off_data *data)
339{
340 /*
341 * If no hibernate type is specified SYSTEM_OFF2 defaults to selecting
342 * HIBERNATE_OFF.
343 *
344 * There are hypervisors in the wild that do not align with the spec and
345 * reject calls that explicitly provide a hibernate type. For
346 * compatibility with these nonstandard implementations, pass 0 as the
347 * type.
348 */
349 if (system_entering_hibernation())
350 invoke_psci_fn(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2), 0, 0, 0);
351 return NOTIFY_DONE;
352}
353
354static int __init psci_hibernate_init(void)
355{
356 if (psci_system_off2_hibernate_supported) {
357 /* Higher priority than EFI shutdown, but only for hibernate */
358 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
359 SYS_OFF_PRIO_FIRMWARE + 2,
360 psci_sys_hibernate, NULL);
361 }
362 return 0;
363}
364subsys_initcall(psci_hibernate_init);
365#endif
366
367static int psci_features(u32 psci_func_id)
368{
369 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
370 psci_func_id, 0, 0);
371}
372
373#ifdef CONFIG_DEBUG_FS
374
375#define PSCI_ID(ver, _name) \
376 { .fn = PSCI_##ver##_FN_##_name, .name = #_name, }
377#define PSCI_ID_NATIVE(ver, _name) \
378 { .fn = PSCI_FN_NATIVE(ver, _name), .name = #_name, }
379
380/* A table of all optional functions */
381static const struct {
382 u32 fn;
383 const char *name;
384} psci_fn_ids[] = {
385 PSCI_ID_NATIVE(0_2, MIGRATE),
386 PSCI_ID(0_2, MIGRATE_INFO_TYPE),
387 PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
388 PSCI_ID(1_0, CPU_FREEZE),
389 PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),
390 PSCI_ID_NATIVE(1_0, NODE_HW_STATE),
391 PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),
392 PSCI_ID(1_0, SET_SUSPEND_MODE),
393 PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),
394 PSCI_ID_NATIVE(1_0, STAT_COUNT),
395 PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),
396 PSCI_ID(1_1, MEM_PROTECT),
397 PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),
398 PSCI_ID_NATIVE(1_3, SYSTEM_OFF2),
399};
400
401static int psci_debugfs_read(struct seq_file *s, void *data)
402{
403 int feature, type, i;
404 u32 ver;
405
406 ver = psci_ops.get_version();
407 seq_printf(s, "PSCIv%d.%d\n",
408 PSCI_VERSION_MAJOR(ver),
409 PSCI_VERSION_MINOR(ver));
410
411 /* PSCI_FEATURES is available only starting from 1.0 */
412 if (PSCI_VERSION_MAJOR(ver) < 1)
413 return 0;
414
415 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
416 if (feature != PSCI_RET_NOT_SUPPORTED) {
417 ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
418 seq_printf(s, "SMC Calling Convention v%d.%d\n",
419 PSCI_VERSION_MAJOR(ver),
420 PSCI_VERSION_MINOR(ver));
421 } else {
422 seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");
423 }
424
425 feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
426 if (feature < 0) {
427 seq_printf(s, "PSCI_FEATURES(CPU_SUSPEND) error (%d)\n", feature);
428 } else {
429 seq_printf(s, "OSI is %ssupported\n",
430 (feature & BIT(0)) ? "" : "not ");
431 seq_printf(s, "%s StateID format is used\n",
432 (feature & BIT(1)) ? "Extended" : "Original");
433 }
434
435 type = psci_ops.migrate_info_type();
436 if (type == PSCI_0_2_TOS_UP_MIGRATE ||
437 type == PSCI_0_2_TOS_UP_NO_MIGRATE) {
438 unsigned long cpuid;
439
440 seq_printf(s, "Trusted OS %smigrate capable\n",
441 type == PSCI_0_2_TOS_UP_NO_MIGRATE ? "not " : "");
442 cpuid = psci_migrate_info_up_cpu();
443 seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",
444 cpuid, resident_cpu);
445 } else if (type == PSCI_0_2_TOS_MP) {
446 seq_puts(s, "Trusted OS migration not required\n");
447 } else {
448 if (type != PSCI_RET_NOT_SUPPORTED)
449 seq_printf(s, "MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
450 }
451
452 for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {
453 feature = psci_features(psci_fn_ids[i].fn);
454 if (feature == PSCI_RET_NOT_SUPPORTED)
455 continue;
456 if (feature < 0)
457 seq_printf(s, "PSCI_FEATURES(%s) error (%d)\n",
458 psci_fn_ids[i].name, feature);
459 else
460 seq_printf(s, "%s is supported\n", psci_fn_ids[i].name);
461 }
462
463 return 0;
464}
465
466static int psci_debugfs_open(struct inode *inode, struct file *f)
467{
468 return single_open(f, psci_debugfs_read, NULL);
469}
470
471static const struct file_operations psci_debugfs_ops = {
472 .owner = THIS_MODULE,
473 .open = psci_debugfs_open,
474 .release = single_release,
475 .read = seq_read,
476 .llseek = seq_lseek
477};
478
479static int __init psci_debugfs_init(void)
480{
481 if (!invoke_psci_fn || !psci_ops.get_version)
482 return 0;
483
484 return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,
485 &psci_debugfs_ops));
486}
487late_initcall(psci_debugfs_init)
488#endif
489
490#ifdef CONFIG_CPU_IDLE
491static noinstr int psci_suspend_finisher(unsigned long state)
492{
493 u32 power_state = state;
494 phys_addr_t pa_cpu_resume;
495
496 pa_cpu_resume = __pa_symbol_nodebug((unsigned long)cpu_resume);
497
498 return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
499}
500
501int psci_cpu_suspend_enter(u32 state)
502{
503 int ret;
504
505 if (!psci_power_state_loses_context(state)) {
506 struct arm_cpuidle_irq_context context;
507
508 ct_cpuidle_enter();
509 arm_cpuidle_save_irq_context(&context);
510 ret = psci_ops.cpu_suspend(state, 0);
511 arm_cpuidle_restore_irq_context(&context);
512 ct_cpuidle_exit();
513 } else {
514 /*
515 * ARM64 cpu_suspend() wants to do ct_cpuidle_*() itself.
516 */
517 if (!IS_ENABLED(CONFIG_ARM64))
518 ct_cpuidle_enter();
519
520 ret = cpu_suspend(state, psci_suspend_finisher);
521
522 if (!IS_ENABLED(CONFIG_ARM64))
523 ct_cpuidle_exit();
524 }
525
526 return ret;
527}
528#endif
529
530static int psci_system_suspend(unsigned long unused)
531{
532 int err;
533 phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);
534
535 err = invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
536 pa_cpu_resume, 0, 0);
537 return psci_to_linux_errno(err);
538}
539
540static int psci_system_suspend_enter(suspend_state_t state)
541{
542 return cpu_suspend(0, psci_system_suspend);
543}
544
545static const struct platform_suspend_ops psci_suspend_ops = {
546 .valid = suspend_valid_only_mem,
547 .enter = psci_system_suspend_enter,
548};
549
550static void __init psci_init_system_reset2(void)
551{
552 int ret;
553
554 ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
555
556 if (ret != PSCI_RET_NOT_SUPPORTED)
557 psci_system_reset2_supported = true;
558}
559
560static void __init psci_init_system_off2(void)
561{
562 int ret;
563
564 ret = psci_features(PSCI_FN_NATIVE(1_3, SYSTEM_OFF2));
565 if (ret < 0)
566 return;
567
568 if (ret & PSCI_1_3_OFF_TYPE_HIBERNATE_OFF)
569 psci_system_off2_hibernate_supported = true;
570}
571
572static void __init psci_init_system_suspend(void)
573{
574 int ret;
575
576 if (!IS_ENABLED(CONFIG_SUSPEND))
577 return;
578
579 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
580
581 if (ret != PSCI_RET_NOT_SUPPORTED)
582 suspend_set_ops(&psci_suspend_ops);
583}
584
585static void __init psci_init_cpu_suspend(void)
586{
587 int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
588
589 if (feature != PSCI_RET_NOT_SUPPORTED)
590 psci_cpu_suspend_feature = feature;
591}
592
593/*
594 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
595 * return DENIED (which would be fatal).
596 */
597static void __init psci_init_migrate(void)
598{
599 unsigned long cpuid;
600 int type, cpu = -1;
601
602 type = psci_ops.migrate_info_type();
603
604 if (type == PSCI_0_2_TOS_MP) {
605 pr_info("Trusted OS migration not required\n");
606 return;
607 }
608
609 if (type == PSCI_RET_NOT_SUPPORTED) {
610 pr_info("MIGRATE_INFO_TYPE not supported.\n");
611 return;
612 }
613
614 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
615 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
616 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
617 return;
618 }
619
620 cpuid = psci_migrate_info_up_cpu();
621 if (cpuid & ~MPIDR_HWID_BITMASK) {
622 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
623 cpuid);
624 return;
625 }
626
627 cpu = get_logical_index(cpuid);
628 resident_cpu = cpu >= 0 ? cpu : -1;
629
630 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
631}
632
633static void __init psci_init_smccc(void)
634{
635 u32 ver = ARM_SMCCC_VERSION_1_0;
636 int feature;
637
638 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
639
640 if (feature != PSCI_RET_NOT_SUPPORTED) {
641 u32 ret;
642 ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
643 if (ret >= ARM_SMCCC_VERSION_1_1) {
644 arm_smccc_version_init(ret, psci_conduit);
645 ver = ret;
646 }
647 }
648
649 /*
650 * Conveniently, the SMCCC and PSCI versions are encoded the
651 * same way. No, this isn't accidental.
652 */
653 pr_info("SMC Calling Convention v%d.%d\n",
654 PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver));
655
656}
657
658static void __init psci_0_2_set_functions(void)
659{
660 pr_info("Using standard PSCI v0.2 function IDs\n");
661
662 psci_ops = (struct psci_operations){
663 .get_version = psci_0_2_get_version,
664 .cpu_suspend = psci_0_2_cpu_suspend,
665 .cpu_off = psci_0_2_cpu_off,
666 .cpu_on = psci_0_2_cpu_on,
667 .migrate = psci_0_2_migrate,
668 .affinity_info = psci_affinity_info,
669 .migrate_info_type = psci_migrate_info_type,
670 };
671
672 register_restart_handler(&psci_sys_reset_nb);
673
674 pm_power_off = psci_sys_poweroff;
675}
676
677/*
678 * Probe function for PSCI firmware versions >= 0.2
679 */
680static int __init psci_probe(void)
681{
682 u32 ver = psci_0_2_get_version();
683
684 pr_info("PSCIv%d.%d detected in firmware.\n",
685 PSCI_VERSION_MAJOR(ver),
686 PSCI_VERSION_MINOR(ver));
687
688 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
689 pr_err("Conflicting PSCI version detected.\n");
690 return -EINVAL;
691 }
692
693 psci_0_2_set_functions();
694
695 psci_init_migrate();
696
697 if (PSCI_VERSION_MAJOR(ver) >= 1) {
698 psci_init_smccc();
699 psci_init_cpu_suspend();
700 psci_init_system_suspend();
701 psci_init_system_reset2();
702 psci_init_system_off2();
703 kvm_init_hyp_services();
704 }
705
706 return 0;
707}
708
709typedef int (*psci_initcall_t)(const struct device_node *);
710
711/*
712 * PSCI init function for PSCI versions >=0.2
713 *
714 * Probe based on PSCI PSCI_VERSION function
715 */
716static int __init psci_0_2_init(const struct device_node *np)
717{
718 int err;
719
720 err = get_set_conduit_method(np);
721 if (err)
722 return err;
723
724 /*
725 * Starting with v0.2, the PSCI specification introduced a call
726 * (PSCI_VERSION) that allows probing the firmware version, so
727 * that PSCI function IDs and version specific initialization
728 * can be carried out according to the specific version reported
729 * by firmware
730 */
731 return psci_probe();
732}
733
734/*
735 * PSCI < v0.2 get PSCI Function IDs via DT.
736 */
737static int __init psci_0_1_init(const struct device_node *np)
738{
739 u32 id;
740 int err;
741
742 err = get_set_conduit_method(np);
743 if (err)
744 return err;
745
746 pr_info("Using PSCI v0.1 Function IDs from DT\n");
747
748 psci_ops.get_version = psci_0_1_get_version;
749
750 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
751 psci_0_1_function_ids.cpu_suspend = id;
752 psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
753 }
754
755 if (!of_property_read_u32(np, "cpu_off", &id)) {
756 psci_0_1_function_ids.cpu_off = id;
757 psci_ops.cpu_off = psci_0_1_cpu_off;
758 }
759
760 if (!of_property_read_u32(np, "cpu_on", &id)) {
761 psci_0_1_function_ids.cpu_on = id;
762 psci_ops.cpu_on = psci_0_1_cpu_on;
763 }
764
765 if (!of_property_read_u32(np, "migrate", &id)) {
766 psci_0_1_function_ids.migrate = id;
767 psci_ops.migrate = psci_0_1_migrate;
768 }
769
770 return 0;
771}
772
773static int __init psci_1_0_init(const struct device_node *np)
774{
775 int err;
776
777 err = psci_0_2_init(np);
778 if (err)
779 return err;
780
781 if (psci_has_osi_support()) {
782 pr_info("OSI mode supported.\n");
783
784 /* Default to PC mode. */
785 psci_set_osi_mode(false);
786 }
787
788 return 0;
789}
790
791static const struct of_device_id psci_of_match[] __initconst = {
792 { .compatible = "arm,psci", .data = psci_0_1_init},
793 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
794 { .compatible = "arm,psci-1.0", .data = psci_1_0_init},
795 {},
796};
797
798int __init psci_dt_init(void)
799{
800 struct device_node *np;
801 const struct of_device_id *matched_np;
802 psci_initcall_t init_fn;
803 int ret;
804
805 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
806
807 if (!np || !of_device_is_available(np))
808 return -ENODEV;
809
810 init_fn = (psci_initcall_t)matched_np->data;
811 ret = init_fn(np);
812
813 of_node_put(np);
814 return ret;
815}
816
817#ifdef CONFIG_ACPI
818/*
819 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
820 * explicitly clarified in SBBR
821 */
822int __init psci_acpi_init(void)
823{
824 if (!acpi_psci_present()) {
825 pr_info("is not implemented in ACPI.\n");
826 return -EOPNOTSUPP;
827 }
828
829 pr_info("probing for conduit method from ACPI.\n");
830
831 if (acpi_psci_use_hvc())
832 set_conduit(SMCCC_CONDUIT_HVC);
833 else
834 set_conduit(SMCCC_CONDUIT_SMC);
835
836 return psci_probe();
837}
838#endif
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 */
50static int resident_cpu = -1;
51struct psci_operations psci_ops;
52static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;
53
54bool psci_tos_resident_on(int cpu)
55{
56 return cpu == resident_cpu;
57}
58
59typedef unsigned long (psci_fn)(unsigned long, unsigned long,
60 unsigned long, unsigned long);
61static psci_fn *invoke_psci_fn;
62
63static struct psci_0_1_function_ids psci_0_1_function_ids;
64
65struct 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
79static u32 psci_cpu_suspend_feature;
80static bool psci_system_reset2_supported;
81
82static 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
88bool psci_has_osi_support(void)
89{
90 return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
91}
92
93static 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
102bool 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
111static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
112 unsigned long arg0, unsigned long arg1,
113 unsigned long arg2)
114{
115 struct arm_smccc_res res;
116
117 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
118 return res.a0;
119}
120
121static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
122 unsigned long arg0, unsigned long arg1,
123 unsigned long arg2)
124{
125 struct arm_smccc_res res;
126
127 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
128 return res.a0;
129}
130
131static int psci_to_linux_errno(int errno)
132{
133 switch (errno) {
134 case PSCI_RET_SUCCESS:
135 return 0;
136 case PSCI_RET_NOT_SUPPORTED:
137 return -EOPNOTSUPP;
138 case PSCI_RET_INVALID_PARAMS:
139 case PSCI_RET_INVALID_ADDRESS:
140 return -EINVAL;
141 case PSCI_RET_DENIED:
142 return -EPERM;
143 }
144
145 return -EINVAL;
146}
147
148static u32 psci_0_1_get_version(void)
149{
150 return PSCI_VERSION(0, 1);
151}
152
153static u32 psci_0_2_get_version(void)
154{
155 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
156}
157
158int psci_set_osi_mode(bool enable)
159{
160 unsigned long suspend_mode;
161 int err;
162
163 suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :
164 PSCI_1_0_SUSPEND_MODE_PC;
165
166 err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
167 if (err < 0)
168 pr_warn("failed to set %s mode: %d\n", enable ? "OSI" : "PC", err);
169 return psci_to_linux_errno(err);
170}
171
172static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
173{
174 int err;
175
176 err = invoke_psci_fn(fn, state, entry_point, 0);
177 return psci_to_linux_errno(err);
178}
179
180static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
181{
182 return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
183 state, entry_point);
184}
185
186static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
187{
188 return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
189 state, entry_point);
190}
191
192static int __psci_cpu_off(u32 fn, u32 state)
193{
194 int err;
195
196 err = invoke_psci_fn(fn, state, 0, 0);
197 return psci_to_linux_errno(err);
198}
199
200static int psci_0_1_cpu_off(u32 state)
201{
202 return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
203}
204
205static int psci_0_2_cpu_off(u32 state)
206{
207 return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
208}
209
210static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
211{
212 int err;
213
214 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
215 return psci_to_linux_errno(err);
216}
217
218static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
219{
220 return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
221}
222
223static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
224{
225 return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
226}
227
228static int __psci_migrate(u32 fn, unsigned long cpuid)
229{
230 int err;
231
232 err = invoke_psci_fn(fn, cpuid, 0, 0);
233 return psci_to_linux_errno(err);
234}
235
236static int psci_0_1_migrate(unsigned long cpuid)
237{
238 return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
239}
240
241static int psci_0_2_migrate(unsigned long cpuid)
242{
243 return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
244}
245
246static int psci_affinity_info(unsigned long target_affinity,
247 unsigned long lowest_affinity_level)
248{
249 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
250 target_affinity, lowest_affinity_level, 0);
251}
252
253static int psci_migrate_info_type(void)
254{
255 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
256}
257
258static unsigned long psci_migrate_info_up_cpu(void)
259{
260 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
261 0, 0, 0);
262}
263
264static void set_conduit(enum arm_smccc_conduit conduit)
265{
266 switch (conduit) {
267 case SMCCC_CONDUIT_HVC:
268 invoke_psci_fn = __invoke_psci_fn_hvc;
269 break;
270 case SMCCC_CONDUIT_SMC:
271 invoke_psci_fn = __invoke_psci_fn_smc;
272 break;
273 default:
274 WARN(1, "Unexpected PSCI conduit %d\n", conduit);
275 }
276
277 psci_conduit = conduit;
278}
279
280static int get_set_conduit_method(const struct device_node *np)
281{
282 const char *method;
283
284 pr_info("probing for conduit method from DT.\n");
285
286 if (of_property_read_string(np, "method", &method)) {
287 pr_warn("missing \"method\" property\n");
288 return -ENXIO;
289 }
290
291 if (!strcmp("hvc", method)) {
292 set_conduit(SMCCC_CONDUIT_HVC);
293 } else if (!strcmp("smc", method)) {
294 set_conduit(SMCCC_CONDUIT_SMC);
295 } else {
296 pr_warn("invalid \"method\" property: %s\n", method);
297 return -EINVAL;
298 }
299 return 0;
300}
301
302static int psci_sys_reset(struct notifier_block *nb, unsigned long action,
303 void *data)
304{
305 if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
306 psci_system_reset2_supported) {
307 /*
308 * reset_type[31] = 0 (architectural)
309 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
310 * cookie = 0 (ignored by the implementation)
311 */
312 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
313 } else {
314 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
315 }
316
317 return NOTIFY_DONE;
318}
319
320static struct notifier_block psci_sys_reset_nb = {
321 .notifier_call = psci_sys_reset,
322 .priority = 129,
323};
324
325static void psci_sys_poweroff(void)
326{
327 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
328}
329
330static int psci_features(u32 psci_func_id)
331{
332 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
333 psci_func_id, 0, 0);
334}
335
336#ifdef CONFIG_DEBUG_FS
337
338#define PSCI_ID(ver, _name) \
339 { .fn = PSCI_##ver##_FN_##_name, .name = #_name, }
340#define PSCI_ID_NATIVE(ver, _name) \
341 { .fn = PSCI_FN_NATIVE(ver, _name), .name = #_name, }
342
343/* A table of all optional functions */
344static const struct {
345 u32 fn;
346 const char *name;
347} psci_fn_ids[] = {
348 PSCI_ID_NATIVE(0_2, MIGRATE),
349 PSCI_ID(0_2, MIGRATE_INFO_TYPE),
350 PSCI_ID_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
351 PSCI_ID(1_0, CPU_FREEZE),
352 PSCI_ID_NATIVE(1_0, CPU_DEFAULT_SUSPEND),
353 PSCI_ID_NATIVE(1_0, NODE_HW_STATE),
354 PSCI_ID_NATIVE(1_0, SYSTEM_SUSPEND),
355 PSCI_ID(1_0, SET_SUSPEND_MODE),
356 PSCI_ID_NATIVE(1_0, STAT_RESIDENCY),
357 PSCI_ID_NATIVE(1_0, STAT_COUNT),
358 PSCI_ID_NATIVE(1_1, SYSTEM_RESET2),
359 PSCI_ID(1_1, MEM_PROTECT),
360 PSCI_ID_NATIVE(1_1, MEM_PROTECT_CHECK_RANGE),
361};
362
363static int psci_debugfs_read(struct seq_file *s, void *data)
364{
365 int feature, type, i;
366 u32 ver;
367
368 ver = psci_ops.get_version();
369 seq_printf(s, "PSCIv%d.%d\n",
370 PSCI_VERSION_MAJOR(ver),
371 PSCI_VERSION_MINOR(ver));
372
373 /* PSCI_FEATURES is available only starting from 1.0 */
374 if (PSCI_VERSION_MAJOR(ver) < 1)
375 return 0;
376
377 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
378 if (feature != PSCI_RET_NOT_SUPPORTED) {
379 ver = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
380 seq_printf(s, "SMC Calling Convention v%d.%d\n",
381 PSCI_VERSION_MAJOR(ver),
382 PSCI_VERSION_MINOR(ver));
383 } else {
384 seq_puts(s, "SMC Calling Convention v1.0 is assumed\n");
385 }
386
387 feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
388 if (feature < 0) {
389 seq_printf(s, "PSCI_FEATURES(CPU_SUSPEND) error (%d)\n", feature);
390 } else {
391 seq_printf(s, "OSI is %ssupported\n",
392 (feature & BIT(0)) ? "" : "not ");
393 seq_printf(s, "%s StateID format is used\n",
394 (feature & BIT(1)) ? "Extended" : "Original");
395 }
396
397 type = psci_ops.migrate_info_type();
398 if (type == PSCI_0_2_TOS_UP_MIGRATE ||
399 type == PSCI_0_2_TOS_UP_NO_MIGRATE) {
400 unsigned long cpuid;
401
402 seq_printf(s, "Trusted OS %smigrate capable\n",
403 type == PSCI_0_2_TOS_UP_NO_MIGRATE ? "not " : "");
404 cpuid = psci_migrate_info_up_cpu();
405 seq_printf(s, "Trusted OS resident on physical CPU 0x%lx (#%d)\n",
406 cpuid, resident_cpu);
407 } else if (type == PSCI_0_2_TOS_MP) {
408 seq_puts(s, "Trusted OS migration not required\n");
409 } else {
410 if (type != PSCI_RET_NOT_SUPPORTED)
411 seq_printf(s, "MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
412 }
413
414 for (i = 0; i < ARRAY_SIZE(psci_fn_ids); i++) {
415 feature = psci_features(psci_fn_ids[i].fn);
416 if (feature == PSCI_RET_NOT_SUPPORTED)
417 continue;
418 if (feature < 0)
419 seq_printf(s, "PSCI_FEATURES(%s) error (%d)\n",
420 psci_fn_ids[i].name, feature);
421 else
422 seq_printf(s, "%s is supported\n", psci_fn_ids[i].name);
423 }
424
425 return 0;
426}
427
428static int psci_debugfs_open(struct inode *inode, struct file *f)
429{
430 return single_open(f, psci_debugfs_read, NULL);
431}
432
433static const struct file_operations psci_debugfs_ops = {
434 .owner = THIS_MODULE,
435 .open = psci_debugfs_open,
436 .release = single_release,
437 .read = seq_read,
438 .llseek = seq_lseek
439};
440
441static int __init psci_debugfs_init(void)
442{
443 if (!invoke_psci_fn || !psci_ops.get_version)
444 return 0;
445
446 return PTR_ERR_OR_ZERO(debugfs_create_file("psci", 0444, NULL, NULL,
447 &psci_debugfs_ops));
448}
449late_initcall(psci_debugfs_init)
450#endif
451
452#ifdef CONFIG_CPU_IDLE
453static int psci_suspend_finisher(unsigned long state)
454{
455 u32 power_state = state;
456 phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);
457
458 return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
459}
460
461int psci_cpu_suspend_enter(u32 state)
462{
463 int ret;
464
465 if (!psci_power_state_loses_context(state)) {
466 struct arm_cpuidle_irq_context context;
467
468 arm_cpuidle_save_irq_context(&context);
469 ret = psci_ops.cpu_suspend(state, 0);
470 arm_cpuidle_restore_irq_context(&context);
471 } else {
472 ret = cpu_suspend(state, psci_suspend_finisher);
473 }
474
475 return ret;
476}
477#endif
478
479static int psci_system_suspend(unsigned long unused)
480{
481 phys_addr_t pa_cpu_resume = __pa_symbol(cpu_resume);
482
483 return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
484 pa_cpu_resume, 0, 0);
485}
486
487static int psci_system_suspend_enter(suspend_state_t state)
488{
489 return cpu_suspend(0, psci_system_suspend);
490}
491
492static const struct platform_suspend_ops psci_suspend_ops = {
493 .valid = suspend_valid_only_mem,
494 .enter = psci_system_suspend_enter,
495};
496
497static void __init psci_init_system_reset2(void)
498{
499 int ret;
500
501 ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
502
503 if (ret != PSCI_RET_NOT_SUPPORTED)
504 psci_system_reset2_supported = true;
505}
506
507static void __init psci_init_system_suspend(void)
508{
509 int ret;
510
511 if (!IS_ENABLED(CONFIG_SUSPEND))
512 return;
513
514 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
515
516 if (ret != PSCI_RET_NOT_SUPPORTED)
517 suspend_set_ops(&psci_suspend_ops);
518}
519
520static void __init psci_init_cpu_suspend(void)
521{
522 int feature = psci_features(PSCI_FN_NATIVE(0_2, CPU_SUSPEND));
523
524 if (feature != PSCI_RET_NOT_SUPPORTED)
525 psci_cpu_suspend_feature = feature;
526}
527
528/*
529 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
530 * return DENIED (which would be fatal).
531 */
532static void __init psci_init_migrate(void)
533{
534 unsigned long cpuid;
535 int type, cpu = -1;
536
537 type = psci_ops.migrate_info_type();
538
539 if (type == PSCI_0_2_TOS_MP) {
540 pr_info("Trusted OS migration not required\n");
541 return;
542 }
543
544 if (type == PSCI_RET_NOT_SUPPORTED) {
545 pr_info("MIGRATE_INFO_TYPE not supported.\n");
546 return;
547 }
548
549 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
550 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
551 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
552 return;
553 }
554
555 cpuid = psci_migrate_info_up_cpu();
556 if (cpuid & ~MPIDR_HWID_BITMASK) {
557 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
558 cpuid);
559 return;
560 }
561
562 cpu = get_logical_index(cpuid);
563 resident_cpu = cpu >= 0 ? cpu : -1;
564
565 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
566}
567
568static void __init psci_init_smccc(void)
569{
570 u32 ver = ARM_SMCCC_VERSION_1_0;
571 int feature;
572
573 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
574
575 if (feature != PSCI_RET_NOT_SUPPORTED) {
576 u32 ret;
577 ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
578 if (ret >= ARM_SMCCC_VERSION_1_1) {
579 arm_smccc_version_init(ret, psci_conduit);
580 ver = ret;
581 }
582 }
583
584 /*
585 * Conveniently, the SMCCC and PSCI versions are encoded the
586 * same way. No, this isn't accidental.
587 */
588 pr_info("SMC Calling Convention v%d.%d\n",
589 PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver));
590
591}
592
593static void __init psci_0_2_set_functions(void)
594{
595 pr_info("Using standard PSCI v0.2 function IDs\n");
596
597 psci_ops = (struct psci_operations){
598 .get_version = psci_0_2_get_version,
599 .cpu_suspend = psci_0_2_cpu_suspend,
600 .cpu_off = psci_0_2_cpu_off,
601 .cpu_on = psci_0_2_cpu_on,
602 .migrate = psci_0_2_migrate,
603 .affinity_info = psci_affinity_info,
604 .migrate_info_type = psci_migrate_info_type,
605 };
606
607 register_restart_handler(&psci_sys_reset_nb);
608
609 pm_power_off = psci_sys_poweroff;
610}
611
612/*
613 * Probe function for PSCI firmware versions >= 0.2
614 */
615static int __init psci_probe(void)
616{
617 u32 ver = psci_0_2_get_version();
618
619 pr_info("PSCIv%d.%d detected in firmware.\n",
620 PSCI_VERSION_MAJOR(ver),
621 PSCI_VERSION_MINOR(ver));
622
623 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
624 pr_err("Conflicting PSCI version detected.\n");
625 return -EINVAL;
626 }
627
628 psci_0_2_set_functions();
629
630 psci_init_migrate();
631
632 if (PSCI_VERSION_MAJOR(ver) >= 1) {
633 psci_init_smccc();
634 psci_init_cpu_suspend();
635 psci_init_system_suspend();
636 psci_init_system_reset2();
637 kvm_init_hyp_services();
638 }
639
640 return 0;
641}
642
643typedef int (*psci_initcall_t)(const struct device_node *);
644
645/*
646 * PSCI init function for PSCI versions >=0.2
647 *
648 * Probe based on PSCI PSCI_VERSION function
649 */
650static int __init psci_0_2_init(const struct device_node *np)
651{
652 int err;
653
654 err = get_set_conduit_method(np);
655 if (err)
656 return err;
657
658 /*
659 * Starting with v0.2, the PSCI specification introduced a call
660 * (PSCI_VERSION) that allows probing the firmware version, so
661 * that PSCI function IDs and version specific initialization
662 * can be carried out according to the specific version reported
663 * by firmware
664 */
665 return psci_probe();
666}
667
668/*
669 * PSCI < v0.2 get PSCI Function IDs via DT.
670 */
671static int __init psci_0_1_init(const struct device_node *np)
672{
673 u32 id;
674 int err;
675
676 err = get_set_conduit_method(np);
677 if (err)
678 return err;
679
680 pr_info("Using PSCI v0.1 Function IDs from DT\n");
681
682 psci_ops.get_version = psci_0_1_get_version;
683
684 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
685 psci_0_1_function_ids.cpu_suspend = id;
686 psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
687 }
688
689 if (!of_property_read_u32(np, "cpu_off", &id)) {
690 psci_0_1_function_ids.cpu_off = id;
691 psci_ops.cpu_off = psci_0_1_cpu_off;
692 }
693
694 if (!of_property_read_u32(np, "cpu_on", &id)) {
695 psci_0_1_function_ids.cpu_on = id;
696 psci_ops.cpu_on = psci_0_1_cpu_on;
697 }
698
699 if (!of_property_read_u32(np, "migrate", &id)) {
700 psci_0_1_function_ids.migrate = id;
701 psci_ops.migrate = psci_0_1_migrate;
702 }
703
704 return 0;
705}
706
707static int __init psci_1_0_init(const struct device_node *np)
708{
709 int err;
710
711 err = psci_0_2_init(np);
712 if (err)
713 return err;
714
715 if (psci_has_osi_support()) {
716 pr_info("OSI mode supported.\n");
717
718 /* Default to PC mode. */
719 psci_set_osi_mode(false);
720 }
721
722 return 0;
723}
724
725static const struct of_device_id psci_of_match[] __initconst = {
726 { .compatible = "arm,psci", .data = psci_0_1_init},
727 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
728 { .compatible = "arm,psci-1.0", .data = psci_1_0_init},
729 {},
730};
731
732int __init psci_dt_init(void)
733{
734 struct device_node *np;
735 const struct of_device_id *matched_np;
736 psci_initcall_t init_fn;
737 int ret;
738
739 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
740
741 if (!np || !of_device_is_available(np))
742 return -ENODEV;
743
744 init_fn = (psci_initcall_t)matched_np->data;
745 ret = init_fn(np);
746
747 of_node_put(np);
748 return ret;
749}
750
751#ifdef CONFIG_ACPI
752/*
753 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
754 * explicitly clarified in SBBR
755 */
756int __init psci_acpi_init(void)
757{
758 if (!acpi_psci_present()) {
759 pr_info("is not implemented in ACPI.\n");
760 return -EOPNOTSUPP;
761 }
762
763 pr_info("probing for conduit method from ACPI.\n");
764
765 if (acpi_psci_use_hvc())
766 set_conduit(SMCCC_CONDUIT_HVC);
767 else
768 set_conduit(SMCCC_CONDUIT_SMC);
769
770 return psci_probe();
771}
772#endif