| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * |
| * Copyright (C) 2015 ARM Limited |
| */ |
| |
| #define pr_fmt(fmt) "psci: " fmt |
| |
| #include <linux/acpi.h> |
| #include <linux/arm-smccc.h> |
| #include <linux/cpuidle.h> |
| #include <linux/errno.h> |
| #include <linux/linkage.h> |
| #include <linux/of.h> |
| #include <linux/pm.h> |
| #include <linux/printk.h> |
| #include <linux/psci.h> |
| #include <linux/reboot.h> |
| #include <linux/slab.h> |
| #include <linux/suspend.h> |
| |
| #include <uapi/linux/psci.h> |
| |
| #include <asm/cpuidle.h> |
| #include <asm/cputype.h> |
| #include <asm/system_misc.h> |
| #include <asm/smp_plat.h> |
| #include <asm/suspend.h> |
| |
| /* |
| * While a 64-bit OS can make calls with SMC32 calling conventions, for some |
| * calls it is necessary to use SMC64 to pass or return 64-bit values. |
| * For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate |
| * (native-width) function ID. |
| */ |
| #ifdef CONFIG_64BIT |
| #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name |
| #else |
| #define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name |
| #endif |
| |
| /* |
| * The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF |
| * calls to its resident CPU, so we must avoid issuing those. We never migrate |
| * a Trusted OS even if it claims to be capable of migration -- doing so will |
| * require cooperation with a Trusted OS driver. |
| */ |
| static int resident_cpu = -1; |
| struct psci_operations psci_ops; |
| static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE; |
| |
| bool psci_tos_resident_on(int cpu) |
| { |
| return cpu == resident_cpu; |
| } |
| |
| typedef unsigned long (psci_fn)(unsigned long, unsigned long, |
| unsigned long, unsigned long); |
| static psci_fn *invoke_psci_fn; |
| |
| enum psci_function { |
| PSCI_FN_CPU_SUSPEND, |
| PSCI_FN_CPU_ON, |
| PSCI_FN_CPU_OFF, |
| PSCI_FN_MIGRATE, |
| PSCI_FN_MAX, |
| }; |
| |
| static u32 psci_function_id[PSCI_FN_MAX]; |
| |
| #define PSCI_0_2_POWER_STATE_MASK \ |
| (PSCI_0_2_POWER_STATE_ID_MASK | \ |
| PSCI_0_2_POWER_STATE_TYPE_MASK | \ |
| PSCI_0_2_POWER_STATE_AFFL_MASK) |
| |
| #define PSCI_1_0_EXT_POWER_STATE_MASK \ |
| (PSCI_1_0_EXT_POWER_STATE_ID_MASK | \ |
| PSCI_1_0_EXT_POWER_STATE_TYPE_MASK) |
| |
| static u32 psci_cpu_suspend_feature; |
| static bool psci_system_reset2_supported; |
| |
| static inline bool psci_has_ext_power_state(void) |
| { |
| return psci_cpu_suspend_feature & |
| PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK; |
| } |
| |
| bool psci_has_osi_support(void) |
| { |
| return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED; |
| } |
| |
| static inline bool psci_power_state_loses_context(u32 state) |
| { |
| const u32 mask = psci_has_ext_power_state() ? |
| PSCI_1_0_EXT_POWER_STATE_TYPE_MASK : |
| PSCI_0_2_POWER_STATE_TYPE_MASK; |
| |
| return state & mask; |
| } |
| |
| bool psci_power_state_is_valid(u32 state) |
| { |
| const u32 valid_mask = psci_has_ext_power_state() ? |
| PSCI_1_0_EXT_POWER_STATE_MASK : |
| PSCI_0_2_POWER_STATE_MASK; |
| |
| return !(state & ~valid_mask); |
| } |
| |
| static unsigned long __invoke_psci_fn_hvc(unsigned long function_id, |
| unsigned long arg0, unsigned long arg1, |
| unsigned long arg2) |
| { |
| struct arm_smccc_res res; |
| |
| arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); |
| return res.a0; |
| } |
| |
| static unsigned long __invoke_psci_fn_smc(unsigned long function_id, |
| unsigned long arg0, unsigned long arg1, |
| unsigned long arg2) |
| { |
| struct arm_smccc_res res; |
| |
| arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res); |
| return res.a0; |
| } |
| |
| static int psci_to_linux_errno(int errno) |
| { |
| switch (errno) { |
| case PSCI_RET_SUCCESS: |
| return 0; |
| case PSCI_RET_NOT_SUPPORTED: |
| return -EOPNOTSUPP; |
| case PSCI_RET_INVALID_PARAMS: |
| case PSCI_RET_INVALID_ADDRESS: |
| return -EINVAL; |
| case PSCI_RET_DENIED: |
| return -EPERM; |
| }; |
| |
| return -EINVAL; |
| } |
| |
| static u32 psci_get_version(void) |
| { |
| return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0); |
| } |
| |
| int psci_set_osi_mode(void) |
| { |
| int err; |
| |
| err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, |
| PSCI_1_0_SUSPEND_MODE_OSI, 0, 0); |
| return psci_to_linux_errno(err); |
| } |
| |
| static int psci_cpu_suspend(u32 state, unsigned long entry_point) |
| { |
| int err; |
| u32 fn; |
| |
| fn = psci_function_id[PSCI_FN_CPU_SUSPEND]; |
| err = invoke_psci_fn(fn, state, entry_point, 0); |
| return psci_to_linux_errno(err); |
| } |
| |
| static int psci_cpu_off(u32 state) |
| { |
| int err; |
| u32 fn; |
| |
| fn = psci_function_id[PSCI_FN_CPU_OFF]; |
| err = invoke_psci_fn(fn, state, 0, 0); |
| return psci_to_linux_errno(err); |
| } |
| |
| static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point) |
| { |
| int err; |
| u32 fn; |
| |
| fn = psci_function_id[PSCI_FN_CPU_ON]; |
| err = invoke_psci_fn(fn, cpuid, entry_point, 0); |
| return psci_to_linux_errno(err); |
| } |
| |
| static int psci_migrate(unsigned long cpuid) |
| { |
| int err; |
| u32 fn; |
| |
| fn = psci_function_id[PSCI_FN_MIGRATE]; |
| err = invoke_psci_fn(fn, cpuid, 0, 0); |
| return psci_to_linux_errno(err); |
| } |
| |
| static int psci_affinity_info(unsigned long target_affinity, |
| unsigned long lowest_affinity_level) |
| { |
| return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO), |
| target_affinity, lowest_affinity_level, 0); |
| } |
| |
| static int psci_migrate_info_type(void) |
| { |
| return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0); |
| } |
| |
| static unsigned long psci_migrate_info_up_cpu(void) |
| { |
| return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU), |
| 0, 0, 0); |
| } |
| |
| static void set_conduit(enum arm_smccc_conduit conduit) |
| { |
| switch (conduit) { |
| case SMCCC_CONDUIT_HVC: |
| invoke_psci_fn = __invoke_psci_fn_hvc; |
| break; |
| case SMCCC_CONDUIT_SMC: |
| invoke_psci_fn = __invoke_psci_fn_smc; |
| break; |
| default: |
| WARN(1, "Unexpected PSCI conduit %d\n", conduit); |
| } |
| |
| psci_conduit = conduit; |
| } |
| |
| static int get_set_conduit_method(struct device_node *np) |
| { |
| const char *method; |
| |
| pr_info("probing for conduit method from DT.\n"); |
| |
| if (of_property_read_string(np, "method", &method)) { |
| pr_warn("missing \"method\" property\n"); |
| return -ENXIO; |
| } |
| |
| if (!strcmp("hvc", method)) { |
| set_conduit(SMCCC_CONDUIT_HVC); |
| } else if (!strcmp("smc", method)) { |
| set_conduit(SMCCC_CONDUIT_SMC); |
| } else { |
| pr_warn("invalid \"method\" property: %s\n", method); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd) |
| { |
| if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) && |
| psci_system_reset2_supported) { |
| /* |
| * reset_type[31] = 0 (architectural) |
| * reset_type[30:0] = 0 (SYSTEM_WARM_RESET) |
| * cookie = 0 (ignored by the implementation) |
| */ |
| invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0); |
| } else { |
| invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0); |
| } |
| } |
| |
| static void psci_sys_poweroff(void) |
| { |
| invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0); |
| } |
| |
| static int __init psci_features(u32 psci_func_id) |
| { |
| return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES, |
| psci_func_id, 0, 0); |
| } |
| |
| #ifdef CONFIG_CPU_IDLE |
| static int psci_suspend_finisher(unsigned long state) |
| { |
| u32 power_state = state; |
| |
| return psci_ops.cpu_suspend(power_state, __pa_symbol(cpu_resume)); |
| } |
| |
| int psci_cpu_suspend_enter(u32 state) |
| { |
| int ret; |
| |
| if (!psci_power_state_loses_context(state)) |
| ret = psci_ops.cpu_suspend(state, 0); |
| else |
| ret = cpu_suspend(state, psci_suspend_finisher); |
| |
| return ret; |
| } |
| #endif |
| |
| static int psci_system_suspend(unsigned long unused) |
| { |
| return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND), |
| __pa_symbol(cpu_resume), 0, 0); |
| } |
| |
| static int psci_system_suspend_enter(suspend_state_t state) |
| { |
| return cpu_suspend(0, psci_system_suspend); |
| } |
| |
| static const struct platform_suspend_ops psci_suspend_ops = { |
| .valid = suspend_valid_only_mem, |
| .enter = psci_system_suspend_enter, |
| }; |
| |
| static void __init psci_init_system_reset2(void) |
| { |
| int ret; |
| |
| ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2)); |
| |
| if (ret != PSCI_RET_NOT_SUPPORTED) |
| psci_system_reset2_supported = true; |
| } |
| |
| static void __init psci_init_system_suspend(void) |
| { |
| int ret; |
| |
| if (!IS_ENABLED(CONFIG_SUSPEND)) |
| return; |
| |
| ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND)); |
| |
| if (ret != PSCI_RET_NOT_SUPPORTED) |
| suspend_set_ops(&psci_suspend_ops); |
| } |
| |
| static void __init psci_init_cpu_suspend(void) |
| { |
| int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]); |
| |
| if (feature != PSCI_RET_NOT_SUPPORTED) |
| psci_cpu_suspend_feature = feature; |
| } |
| |
| /* |
| * Detect the presence of a resident Trusted OS which may cause CPU_OFF to |
| * return DENIED (which would be fatal). |
| */ |
| static void __init psci_init_migrate(void) |
| { |
| unsigned long cpuid; |
| int type, cpu = -1; |
| |
| type = psci_ops.migrate_info_type(); |
| |
| if (type == PSCI_0_2_TOS_MP) { |
| pr_info("Trusted OS migration not required\n"); |
| return; |
| } |
| |
| if (type == PSCI_RET_NOT_SUPPORTED) { |
| pr_info("MIGRATE_INFO_TYPE not supported.\n"); |
| return; |
| } |
| |
| if (type != PSCI_0_2_TOS_UP_MIGRATE && |
| type != PSCI_0_2_TOS_UP_NO_MIGRATE) { |
| pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type); |
| return; |
| } |
| |
| cpuid = psci_migrate_info_up_cpu(); |
| if (cpuid & ~MPIDR_HWID_BITMASK) { |
| pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n", |
| cpuid); |
| return; |
| } |
| |
| cpu = get_logical_index(cpuid); |
| resident_cpu = cpu >= 0 ? cpu : -1; |
| |
| pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid); |
| } |
| |
| static void __init psci_init_smccc(void) |
| { |
| u32 ver = ARM_SMCCC_VERSION_1_0; |
| int feature; |
| |
| feature = psci_features(ARM_SMCCC_VERSION_FUNC_ID); |
| |
| if (feature != PSCI_RET_NOT_SUPPORTED) { |
| u32 ret; |
| ret = invoke_psci_fn(ARM_SMCCC_VERSION_FUNC_ID, 0, 0, 0); |
| if (ret >= ARM_SMCCC_VERSION_1_1) { |
| arm_smccc_version_init(ret, psci_conduit); |
| ver = ret; |
| } |
| } |
| |
| /* |
| * Conveniently, the SMCCC and PSCI versions are encoded the |
| * same way. No, this isn't accidental. |
| */ |
| pr_info("SMC Calling Convention v%d.%d\n", |
| PSCI_VERSION_MAJOR(ver), PSCI_VERSION_MINOR(ver)); |
| |
| } |
| |
| static void __init psci_0_2_set_functions(void) |
| { |
| pr_info("Using standard PSCI v0.2 function IDs\n"); |
| psci_ops.get_version = psci_get_version; |
| |
| psci_function_id[PSCI_FN_CPU_SUSPEND] = |
| PSCI_FN_NATIVE(0_2, CPU_SUSPEND); |
| psci_ops.cpu_suspend = psci_cpu_suspend; |
| |
| psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF; |
| psci_ops.cpu_off = psci_cpu_off; |
| |
| psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON); |
| psci_ops.cpu_on = psci_cpu_on; |
| |
| psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE); |
| psci_ops.migrate = psci_migrate; |
| |
| psci_ops.affinity_info = psci_affinity_info; |
| |
| psci_ops.migrate_info_type = psci_migrate_info_type; |
| |
| arm_pm_restart = psci_sys_reset; |
| |
| pm_power_off = psci_sys_poweroff; |
| } |
| |
| /* |
| * Probe function for PSCI firmware versions >= 0.2 |
| */ |
| static int __init psci_probe(void) |
| { |
| u32 ver = psci_get_version(); |
| |
| pr_info("PSCIv%d.%d detected in firmware.\n", |
| PSCI_VERSION_MAJOR(ver), |
| PSCI_VERSION_MINOR(ver)); |
| |
| if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) { |
| pr_err("Conflicting PSCI version detected.\n"); |
| return -EINVAL; |
| } |
| |
| psci_0_2_set_functions(); |
| |
| psci_init_migrate(); |
| |
| if (PSCI_VERSION_MAJOR(ver) >= 1) { |
| psci_init_smccc(); |
| psci_init_cpu_suspend(); |
| psci_init_system_suspend(); |
| psci_init_system_reset2(); |
| } |
| |
| return 0; |
| } |
| |
| typedef int (*psci_initcall_t)(const struct device_node *); |
| |
| /* |
| * PSCI init function for PSCI versions >=0.2 |
| * |
| * Probe based on PSCI PSCI_VERSION function |
| */ |
| static int __init psci_0_2_init(struct device_node *np) |
| { |
| int err; |
| |
| err = get_set_conduit_method(np); |
| if (err) |
| return err; |
| |
| /* |
| * Starting with v0.2, the PSCI specification introduced a call |
| * (PSCI_VERSION) that allows probing the firmware version, so |
| * that PSCI function IDs and version specific initialization |
| * can be carried out according to the specific version reported |
| * by firmware |
| */ |
| return psci_probe(); |
| } |
| |
| /* |
| * PSCI < v0.2 get PSCI Function IDs via DT. |
| */ |
| static int __init psci_0_1_init(struct device_node *np) |
| { |
| u32 id; |
| int err; |
| |
| err = get_set_conduit_method(np); |
| if (err) |
| return err; |
| |
| pr_info("Using PSCI v0.1 Function IDs from DT\n"); |
| |
| if (!of_property_read_u32(np, "cpu_suspend", &id)) { |
| psci_function_id[PSCI_FN_CPU_SUSPEND] = id; |
| psci_ops.cpu_suspend = psci_cpu_suspend; |
| } |
| |
| if (!of_property_read_u32(np, "cpu_off", &id)) { |
| psci_function_id[PSCI_FN_CPU_OFF] = id; |
| psci_ops.cpu_off = psci_cpu_off; |
| } |
| |
| if (!of_property_read_u32(np, "cpu_on", &id)) { |
| psci_function_id[PSCI_FN_CPU_ON] = id; |
| psci_ops.cpu_on = psci_cpu_on; |
| } |
| |
| if (!of_property_read_u32(np, "migrate", &id)) { |
| psci_function_id[PSCI_FN_MIGRATE] = id; |
| psci_ops.migrate = psci_migrate; |
| } |
| |
| return 0; |
| } |
| |
| static int __init psci_1_0_init(struct device_node *np) |
| { |
| int err; |
| |
| err = psci_0_2_init(np); |
| if (err) |
| return err; |
| |
| if (psci_has_osi_support()) { |
| pr_info("OSI mode supported.\n"); |
| |
| /* Default to PC mode. */ |
| invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, |
| PSCI_1_0_SUSPEND_MODE_PC, 0, 0); |
| } |
| |
| return 0; |
| } |
| |
| static const struct of_device_id psci_of_match[] __initconst = { |
| { .compatible = "arm,psci", .data = psci_0_1_init}, |
| { .compatible = "arm,psci-0.2", .data = psci_0_2_init}, |
| { .compatible = "arm,psci-1.0", .data = psci_1_0_init}, |
| {}, |
| }; |
| |
| int __init psci_dt_init(void) |
| { |
| struct device_node *np; |
| const struct of_device_id *matched_np; |
| psci_initcall_t init_fn; |
| int ret; |
| |
| np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np); |
| |
| if (!np || !of_device_is_available(np)) |
| return -ENODEV; |
| |
| init_fn = (psci_initcall_t)matched_np->data; |
| ret = init_fn(np); |
| |
| of_node_put(np); |
| return ret; |
| } |
| |
| #ifdef CONFIG_ACPI |
| /* |
| * We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's |
| * explicitly clarified in SBBR |
| */ |
| int __init psci_acpi_init(void) |
| { |
| if (!acpi_psci_present()) { |
| pr_info("is not implemented in ACPI.\n"); |
| return -EOPNOTSUPP; |
| } |
| |
| pr_info("probing for conduit method from ACPI.\n"); |
| |
| if (acpi_psci_use_hvc()) |
| set_conduit(SMCCC_CONDUIT_HVC); |
| else |
| set_conduit(SMCCC_CONDUIT_SMC); |
| |
| return psci_probe(); |
| } |
| #endif |