1 // SPDX-License-Identifier: GPL-2.0-only
4 * Copyright (C) 2015 ARM Limited
7 #define pr_fmt(fmt) "psci: " fmt
9 #include <linux/acpi.h>
10 #include <linux/arm-smccc.h>
11 #include <linux/cpuidle.h>
12 #include <linux/errno.h>
13 #include <linux/linkage.h>
16 #include <linux/printk.h>
17 #include <linux/psci.h>
18 #include <linux/reboot.h>
19 #include <linux/slab.h>
20 #include <linux/suspend.h>
22 #include <uapi/linux/psci.h>
24 #include <asm/cpuidle.h>
25 #include <asm/cputype.h>
26 #include <asm/system_misc.h>
27 #include <asm/smp_plat.h>
28 #include <asm/suspend.h>
31 * While a 64-bit OS can make calls with SMC32 calling conventions, for some
32 * calls it is necessary to use SMC64 to pass or return 64-bit values.
33 * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
34 * (native-width) function ID.
37 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
39 #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
43 * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
44 * calls to its resident CPU, so we must avoid issuing those. We never migrate
45 * a Trusted OS even if it claims to be capable of migration -- doing so will
46 * require cooperation with a Trusted OS driver.
48 static int resident_cpu = -1;
50 bool psci_tos_resident_on(int cpu)
52 return cpu == resident_cpu;
55 struct psci_operations psci_ops = {
56 .conduit = SMCCC_CONDUIT_NONE,
57 .smccc_version = SMCCC_VERSION_1_0,
60 enum arm_smccc_conduit arm_smccc_1_1_get_conduit(void)
62 if (psci_ops.smccc_version < SMCCC_VERSION_1_1)
63 return SMCCC_CONDUIT_NONE;
65 return psci_ops.conduit;
68 typedef unsigned long (psci_fn)(unsigned long, unsigned long,
69 unsigned long, unsigned long);
70 static psci_fn *invoke_psci_fn;
80 static u32 psci_function_id[PSCI_FN_MAX];
82 #define PSCI_0_2_POWER_STATE_MASK \
83 (PSCI_0_2_POWER_STATE_ID_MASK | \
84 PSCI_0_2_POWER_STATE_TYPE_MASK | \
85 PSCI_0_2_POWER_STATE_AFFL_MASK)
87 #define PSCI_1_0_EXT_POWER_STATE_MASK \
88 (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
89 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
91 static u32 psci_cpu_suspend_feature;
92 static bool psci_system_reset2_supported;
94 static inline bool psci_has_ext_power_state(void)
96 return psci_cpu_suspend_feature &
97 PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
100 static inline bool psci_has_osi_support(void)
102 return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
105 static inline bool psci_power_state_loses_context(u32 state)
107 const u32 mask = psci_has_ext_power_state() ?
108 PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
109 PSCI_0_2_POWER_STATE_TYPE_MASK;
114 bool psci_power_state_is_valid(u32 state)
116 const u32 valid_mask = psci_has_ext_power_state() ?
117 PSCI_1_0_EXT_POWER_STATE_MASK :
118 PSCI_0_2_POWER_STATE_MASK;
120 return !(state & ~valid_mask);
123 static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
124 unsigned long arg0, unsigned long arg1,
127 struct arm_smccc_res res;
129 arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
133 static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
134 unsigned long arg0, unsigned long arg1,
137 struct arm_smccc_res res;
139 arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
143 static int psci_to_linux_errno(int errno)
146 case PSCI_RET_SUCCESS:
148 case PSCI_RET_NOT_SUPPORTED:
150 case PSCI_RET_INVALID_PARAMS:
151 case PSCI_RET_INVALID_ADDRESS:
153 case PSCI_RET_DENIED:
160 static u32 psci_get_version(void)
162 return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
165 static int psci_cpu_suspend(u32 state, unsigned long entry_point)
170 fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
171 err = invoke_psci_fn(fn, state, entry_point, 0);
172 return psci_to_linux_errno(err);
175 static int psci_cpu_off(u32 state)
180 fn = psci_function_id[PSCI_FN_CPU_OFF];
181 err = invoke_psci_fn(fn, state, 0, 0);
182 return psci_to_linux_errno(err);
185 static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
190 fn = psci_function_id[PSCI_FN_CPU_ON];
191 err = invoke_psci_fn(fn, cpuid, entry_point, 0);
192 return psci_to_linux_errno(err);
195 static int psci_migrate(unsigned long cpuid)
200 fn = psci_function_id[PSCI_FN_MIGRATE];
201 err = invoke_psci_fn(fn, cpuid, 0, 0);
202 return psci_to_linux_errno(err);
205 static int psci_affinity_info(unsigned long target_affinity,
206 unsigned long lowest_affinity_level)
208 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
209 target_affinity, lowest_affinity_level, 0);
212 static int psci_migrate_info_type(void)
214 return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
217 static unsigned long psci_migrate_info_up_cpu(void)
219 return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
223 static void set_conduit(enum arm_smccc_conduit conduit)
226 case SMCCC_CONDUIT_HVC:
227 invoke_psci_fn = __invoke_psci_fn_hvc;
229 case SMCCC_CONDUIT_SMC:
230 invoke_psci_fn = __invoke_psci_fn_smc;
233 WARN(1, "Unexpected PSCI conduit %d\n", conduit);
236 psci_ops.conduit = conduit;
239 static int get_set_conduit_method(struct device_node *np)
243 pr_info("probing for conduit method from DT.\n");
245 if (of_property_read_string(np, "method", &method)) {
246 pr_warn("missing \"method\" property\n");
250 if (!strcmp("hvc", method)) {
251 set_conduit(SMCCC_CONDUIT_HVC);
252 } else if (!strcmp("smc", method)) {
253 set_conduit(SMCCC_CONDUIT_SMC);
255 pr_warn("invalid \"method\" property: %s\n", method);
261 static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
263 if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
264 psci_system_reset2_supported) {
266 * reset_type[31] = 0 (architectural)
267 * reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
268 * cookie = 0 (ignored by the implementation)
270 invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
272 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
276 static void psci_sys_poweroff(void)
278 invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
281 static int __init psci_features(u32 psci_func_id)
283 return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
287 #ifdef CONFIG_CPU_IDLE
288 static int psci_suspend_finisher(unsigned long state)
290 u32 power_state = state;
292 return psci_ops.cpu_suspend(power_state, __pa_symbol(cpu_resume));
295 int psci_cpu_suspend_enter(u32 state)
299 if (!psci_power_state_loses_context(state))
300 ret = psci_ops.cpu_suspend(state, 0);
302 ret = cpu_suspend(state, psci_suspend_finisher);
308 static int psci_system_suspend(unsigned long unused)
310 return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
311 __pa_symbol(cpu_resume), 0, 0);
314 static int psci_system_suspend_enter(suspend_state_t state)
316 return cpu_suspend(0, psci_system_suspend);
319 static const struct platform_suspend_ops psci_suspend_ops = {
320 .valid = suspend_valid_only_mem,
321 .enter = psci_system_suspend_enter,
324 static void __init psci_init_system_reset2(void)
328 ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
330 if (ret != PSCI_RET_NOT_SUPPORTED)
331 psci_system_reset2_supported = true;
334 static void __init psci_init_system_suspend(void)
338 if (!IS_ENABLED(CONFIG_SUSPEND))
341 ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
343 if (ret != PSCI_RET_NOT_SUPPORTED)
344 suspend_set_ops(&psci_suspend_ops);
347 static void __init psci_init_cpu_suspend(void)
349 int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
351 if (feature != PSCI_RET_NOT_SUPPORTED)
352 psci_cpu_suspend_feature = feature;
356 * Detect the presence of a resident Trusted OS which may cause CPU_OFF to
357 * return DENIED (which would be fatal).
359 static void __init psci_init_migrate(void)
364 type = psci_ops.migrate_info_type();
366 if (type == PSCI_0_2_TOS_MP) {
367 pr_info("Trusted OS migration not required\n");
371 if (type == PSCI_RET_NOT_SUPPORTED) {
372 pr_info("MIGRATE_INFO_TYPE not supported.\n");
376 if (type != PSCI_0_2_TOS_UP_MIGRATE &&
377 type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
378 pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
382 cpuid = psci_migrate_info_up_cpu();
383 if (cpuid & ~MPIDR_HWID_BITMASK) {
384 pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
389 cpu = get_logical_index(cpuid);
390 resident_cpu = cpu >= 0 ? cpu : -1;
392 pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
395 static void __init psci_init_smccc(void)
397 u32 ver = ARM_SMCCC_VERSION_1_0;
400 feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID);
402 if (feature != PSCI_RET_NOT_SUPPORTED) {
404 ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0);
405 if (ret == ARM_SMCCC_VERSION_1_1) {
406 psci_ops.smccc_version = SMCCC_VERSION_1_1;
412 * Conveniently, the SMCCC and PSCI versions are encoded the
413 * same way. No, this isn't accidental.
415 pr_info("SMC Calling Convention v%d.%d\n",
416 PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver));
420 static void __init psci_0_2_set_functions(void)
422 pr_info("Using standard PSCI v0.2 function IDs\n");
423 psci_ops.get_version = psci_get_version;
425 psci_function_id[PSCI_FN_CPU_SUSPEND] =
426 PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
427 psci_ops.cpu_suspend = psci_cpu_suspend;
429 psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
430 psci_ops.cpu_off = psci_cpu_off;
432 psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
433 psci_ops.cpu_on = psci_cpu_on;
435 psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
436 psci_ops.migrate = psci_migrate;
438 psci_ops.affinity_info = psci_affinity_info;
440 psci_ops.migrate_info_type = psci_migrate_info_type;
442 arm_pm_restart = psci_sys_reset;
444 pm_power_off = psci_sys_poweroff;
448 * Probe function for PSCI firmware versions >= 0.2
450 static int __init psci_probe(void)
452 u32 ver = psci_get_version();
454 pr_info("PSCIv%d.%d detected in firmware.\n",
455 PSCI_VERSION_MAJOR(ver),
456 PSCI_VERSION_MINOR(ver));
458 if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
459 pr_err("Conflicting PSCI version detected.\n");
463 psci_0_2_set_functions();
467 if (PSCI_VERSION_MAJOR(ver) >= 1) {
469 psci_init_cpu_suspend();
470 psci_init_system_suspend();
471 psci_init_system_reset2();
477 typedef int (*psci_initcall_t)(const struct device_node *);
480 * PSCI init function for PSCI versions >=0.2
482 * Probe based on PSCI PSCI_VERSION function
484 static int __init psci_0_2_init(struct device_node *np)
488 err = get_set_conduit_method(np);
493 * Starting with v0.2, the PSCI specification introduced a call
494 * (PSCI_VERSION) that allows probing the firmware version, so
495 * that PSCI function IDs and version specific initialization
496 * can be carried out according to the specific version reported
503 * PSCI < v0.2 get PSCI Function IDs via DT.
505 static int __init psci_0_1_init(struct device_node *np)
510 err = get_set_conduit_method(np);
514 pr_info("Using PSCI v0.1 Function IDs from DT\n");
516 if (!of_property_read_u32(np, "cpu_suspend", &id)) {
517 psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
518 psci_ops.cpu_suspend = psci_cpu_suspend;
521 if (!of_property_read_u32(np, "cpu_off", &id)) {
522 psci_function_id[PSCI_FN_CPU_OFF] = id;
523 psci_ops.cpu_off = psci_cpu_off;
526 if (!of_property_read_u32(np, "cpu_on", &id)) {
527 psci_function_id[PSCI_FN_CPU_ON] = id;
528 psci_ops.cpu_on = psci_cpu_on;
531 if (!of_property_read_u32(np, "migrate", &id)) {
532 psci_function_id[PSCI_FN_MIGRATE] = id;
533 psci_ops.migrate = psci_migrate;
539 static int __init psci_1_0_init(struct device_node *np)
543 err = psci_0_2_init(np);
547 if (psci_has_osi_support())
548 pr_info("OSI mode supported.\n");
553 static const struct of_device_id psci_of_match[] __initconst = {
554 { .compatible = "arm,psci", .data = psci_0_1_init},
555 { .compatible = "arm,psci-0.2", .data = psci_0_2_init},
556 { .compatible = "arm,psci-1.0", .data = psci_1_0_init},
560 int __init psci_dt_init(void)
562 struct device_node *np;
563 const struct of_device_id *matched_np;
564 psci_initcall_t init_fn;
567 np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
569 if (!np || !of_device_is_available(np))
572 init_fn = (psci_initcall_t)matched_np->data;
581 * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
582 * explicitly clarified in SBBR
584 int __init psci_acpi_init(void)
586 if (!acpi_psci_present()) {
587 pr_info("is not implemented in ACPI.\n");
591 pr_info("probing for conduit method from ACPI.\n");
593 if (acpi_psci_use_hvc())
594 set_conduit(SMCCC_CONDUIT_HVC);
596 set_conduit(SMCCC_CONDUIT_SMC);