OSCL-LXR linux-6.0.1/​drivers/​firmware/​psci/​psci.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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/hypervisor.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;
 
 static struct psci_0_1_function_ids psci_0_1_function_ids;
 
 struct psci_0_1_function_ids get_psci_0_1_function_ids(void)
 {
     return psci_0_1_function_ids;
 }
 
 #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_0_1_get_version(void)
 {
     return PSCI_VERSION(0, 1);
 }
 
 static u32 psci_0_2_get_version(void)
 {
     return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
 }
 
 int psci_set_osi_mode(bool enable)
 {
     unsigned long suspend_mode;
     int err;
 
     suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :
             PSCI_1_0_SUSPEND_MODE_PC;
 
     err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
     return psci_to_linux_errno(err);
 }
 
 static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
 {
     int err;
 
     err = invoke_psci_fn(fn, state, entry_point, 0);
     return psci_to_linux_errno(err);
 }
 
 static int psci_0_1_cpu_suspend(u32 state, unsigned long entry_point)
 {
     return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
                   state, entry_point);
 }
 
 static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
 {
     return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
                   state, entry_point);
 }
 
 static int __psci_cpu_off(u32 fn, u32 state)
 {
     int err;
 
     err = invoke_psci_fn(fn, state, 0, 0);
     return psci_to_linux_errno(err);
 }
 
 static int psci_0_1_cpu_off(u32 state)
 {
     return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
 }
 
 static int psci_0_2_cpu_off(u32 state)
 {
     return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
 }
 
 static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
 {
     int err;
 
     err = invoke_psci_fn(fn, cpuid, entry_point, 0);
     return psci_to_linux_errno(err);
 }
 
 static int psci_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
 {
     return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
 }
 
 static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
 {
     return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
 }
 
 static int __psci_migrate(u32 fn, unsigned long cpuid)
 {
     int err;
 
     err = invoke_psci_fn(fn, cpuid, 0, 0);
     return psci_to_linux_errno(err);
 }
 
 static int psci_0_1_migrate(unsigned long cpuid)
 {
     return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
 }
 
 static int psci_0_2_migrate(unsigned long cpuid)
 {
     return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
 }
 
 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 int psci_sys_reset(struct notifier_block *nb, unsigned long action,
               void *data)
 {
     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);
     }
 
     return NOTIFY_DONE;
 }
 
 static struct notifier_block psci_sys_reset_nb = {
     .notifier_call = psci_sys_reset,
     .priority = 129,
 };
 
 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;
     phys_addr_t pa_cpu_resume = __pa_symbol(function_nocfi(cpu_resume));
 
     return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
 }
 
 int psci_cpu_suspend_enter(u32 state)
 {
     int ret;
 
     if (!psci_power_state_loses_context(state)) {
         struct arm_cpuidle_irq_context context;
 
         arm_cpuidle_save_irq_context(&context);
         ret = psci_ops.cpu_suspend(state, 0);
         arm_cpuidle_restore_irq_context(&context);
     } else {
         ret = cpu_suspend(state, psci_suspend_finisher);
     }
 
     return ret;
 }
 #endif
 
 static int psci_system_suspend(unsigned long unused)
 {
     phys_addr_t pa_cpu_resume = __pa_symbol(function_nocfi(cpu_resume));
 
     return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
                   pa_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_FN_NATIVE(0_2, 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 = (struct psci_operations){
         .get_version = psci_0_2_get_version,
         .cpu_suspend = psci_0_2_cpu_suspend,
         .cpu_off = psci_0_2_cpu_off,
         .cpu_on = psci_0_2_cpu_on,
         .migrate = psci_0_2_migrate,
         .affinity_info = psci_affinity_info,
         .migrate_info_type = psci_migrate_info_type,
     };
 
     register_restart_handler(&psci_sys_reset_nb);
 
     pm_power_off = psci_sys_poweroff;
 }
 
 /*
  * Probe function for PSCI firmware versions >= 0.2
  */
 static int __init psci_probe(void)
 {
     u32 ver = psci_0_2_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();
         kvm_init_hyp_services();
     }
 
     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");
 
     psci_ops.get_version = psci_0_1_get_version;
 
     if (!of_property_read_u32(np, "cpu_suspend", &id)) {
         psci_0_1_function_ids.cpu_suspend = id;
         psci_ops.cpu_suspend = psci_0_1_cpu_suspend;
     }
 
     if (!of_property_read_u32(np, "cpu_off", &id)) {
         psci_0_1_function_ids.cpu_off = id;
         psci_ops.cpu_off = psci_0_1_cpu_off;
     }
 
     if (!of_property_read_u32(np, "cpu_on", &id)) {
         psci_0_1_function_ids.cpu_on = id;
         psci_ops.cpu_on = psci_0_1_cpu_on;
     }
 
     if (!of_property_read_u32(np, "migrate", &id)) {
         psci_0_1_function_ids.migrate = id;
         psci_ops.migrate = psci_0_1_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. */
         psci_set_osi_mode(false);
     }
 
     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

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