490 lines
11 KiB
C
490 lines
11 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Copyright (C) 2015 ARM Limited
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*/
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#define pr_fmt(fmt) "psci: " fmt
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#include <linux/arm-smccc.h>
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#include <linux/errno.h>
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#include <linux/linkage.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#include <linux/printk.h>
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#include <linux/psci.h>
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#include <linux/reboot.h>
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#include <linux/suspend.h>
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#include <uapi/linux/psci.h>
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#include <asm/cputype.h>
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#include <asm/system_misc.h>
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#include <asm/smp_plat.h>
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#include <asm/suspend.h>
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/*
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* While a 64-bit OS can make calls with SMC32 calling conventions, for some
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* calls it is necessary to use SMC64 to pass or return 64-bit values.
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* For such calls PSCI_FN_NATIVE(version, name) will choose the appropriate
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* (native-width) function ID.
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*/
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#ifdef CONFIG_64BIT
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#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN64_##name
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#else
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#define PSCI_FN_NATIVE(version, name) PSCI_##version##_FN_##name
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#endif
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/*
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* The CPU any Trusted OS is resident on. The trusted OS may reject CPU_OFF
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* calls to its resident CPU, so we must avoid issuing those. We never migrate
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* a Trusted OS even if it claims to be capable of migration -- doing so will
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* require cooperation with a Trusted OS driver.
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*/
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static int resident_cpu = -1;
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bool psci_tos_resident_on(int cpu)
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{
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return cpu == resident_cpu;
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}
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struct psci_operations psci_ops;
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typedef unsigned long (psci_fn)(unsigned long, unsigned long,
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unsigned long, unsigned long);
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static psci_fn *invoke_psci_fn;
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enum psci_function {
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PSCI_FN_CPU_SUSPEND,
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PSCI_FN_CPU_ON,
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PSCI_FN_CPU_OFF,
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PSCI_FN_MIGRATE,
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PSCI_FN_MAX,
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};
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static u32 psci_function_id[PSCI_FN_MAX];
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#define PSCI_0_2_POWER_STATE_MASK \
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(PSCI_0_2_POWER_STATE_ID_MASK | \
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PSCI_0_2_POWER_STATE_TYPE_MASK | \
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PSCI_0_2_POWER_STATE_AFFL_MASK)
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#define PSCI_1_0_EXT_POWER_STATE_MASK \
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(PSCI_1_0_EXT_POWER_STATE_ID_MASK | \
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PSCI_1_0_EXT_POWER_STATE_TYPE_MASK)
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static u32 psci_cpu_suspend_feature;
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static inline bool psci_has_ext_power_state(void)
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{
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return psci_cpu_suspend_feature &
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PSCI_1_0_FEATURES_CPU_SUSPEND_PF_MASK;
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}
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bool psci_power_state_loses_context(u32 state)
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{
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const u32 mask = psci_has_ext_power_state() ?
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PSCI_1_0_EXT_POWER_STATE_TYPE_MASK :
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PSCI_0_2_POWER_STATE_TYPE_MASK;
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return state & mask;
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}
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bool psci_power_state_is_valid(u32 state)
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{
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const u32 valid_mask = psci_has_ext_power_state() ?
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PSCI_1_0_EXT_POWER_STATE_MASK :
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PSCI_0_2_POWER_STATE_MASK;
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return !(state & ~valid_mask);
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}
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static unsigned long __invoke_psci_fn_hvc(unsigned long function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2)
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{
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struct arm_smccc_res res;
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arm_smccc_hvc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static unsigned long __invoke_psci_fn_smc(unsigned long function_id,
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unsigned long arg0, unsigned long arg1,
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unsigned long arg2)
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{
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struct arm_smccc_res res;
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arm_smccc_smc(function_id, arg0, arg1, arg2, 0, 0, 0, 0, &res);
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return res.a0;
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}
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static int psci_to_linux_errno(int errno)
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{
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switch (errno) {
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case PSCI_RET_SUCCESS:
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return 0;
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case PSCI_RET_NOT_SUPPORTED:
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return -EOPNOTSUPP;
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case PSCI_RET_INVALID_PARAMS:
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case PSCI_RET_INVALID_ADDRESS:
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return -EINVAL;
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case PSCI_RET_DENIED:
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return -EPERM;
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};
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return -EINVAL;
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}
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static u32 psci_get_version(void)
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{
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return invoke_psci_fn(PSCI_0_2_FN_PSCI_VERSION, 0, 0, 0);
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}
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static int psci_cpu_suspend(u32 state, unsigned long entry_point)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_SUSPEND];
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err = invoke_psci_fn(fn, state, entry_point, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_cpu_off(u32 state)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_OFF];
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err = invoke_psci_fn(fn, state, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_cpu_on(unsigned long cpuid, unsigned long entry_point)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_CPU_ON];
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err = invoke_psci_fn(fn, cpuid, entry_point, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_migrate(unsigned long cpuid)
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{
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int err;
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u32 fn;
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fn = psci_function_id[PSCI_FN_MIGRATE];
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err = invoke_psci_fn(fn, cpuid, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int psci_affinity_info(unsigned long target_affinity,
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unsigned long lowest_affinity_level)
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{
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return invoke_psci_fn(PSCI_FN_NATIVE(0_2, AFFINITY_INFO),
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target_affinity, lowest_affinity_level, 0);
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}
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static int psci_migrate_info_type(void)
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{
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return invoke_psci_fn(PSCI_0_2_FN_MIGRATE_INFO_TYPE, 0, 0, 0);
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}
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static unsigned long psci_migrate_info_up_cpu(void)
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{
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return invoke_psci_fn(PSCI_FN_NATIVE(0_2, MIGRATE_INFO_UP_CPU),
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0, 0, 0);
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}
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static int get_set_conduit_method(struct device_node *np)
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{
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const char *method;
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pr_info("probing for conduit method from DT.\n");
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if (of_property_read_string(np, "method", &method)) {
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pr_warn("missing \"method\" property\n");
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return -ENXIO;
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}
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if (!strcmp("hvc", method)) {
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invoke_psci_fn = __invoke_psci_fn_hvc;
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} else if (!strcmp("smc", method)) {
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invoke_psci_fn = __invoke_psci_fn_smc;
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} else {
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pr_warn("invalid \"method\" property: %s\n", method);
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return -EINVAL;
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}
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return 0;
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}
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static void psci_sys_reset(enum reboot_mode reboot_mode, const char *cmd)
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{
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
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}
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static void psci_sys_poweroff(void)
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{
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_OFF, 0, 0, 0);
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}
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static int __init psci_features(u32 psci_func_id)
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{
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return invoke_psci_fn(PSCI_1_0_FN_PSCI_FEATURES,
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psci_func_id, 0, 0);
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}
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static int psci_system_suspend(unsigned long unused)
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{
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return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
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virt_to_phys(cpu_resume), 0, 0);
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}
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static int psci_system_suspend_enter(suspend_state_t state)
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{
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return cpu_suspend(0, psci_system_suspend);
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}
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static const struct platform_suspend_ops psci_suspend_ops = {
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.valid = suspend_valid_only_mem,
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.enter = psci_system_suspend_enter,
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};
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static void __init psci_init_system_suspend(void)
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{
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int ret;
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if (!IS_ENABLED(CONFIG_SUSPEND))
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return;
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ret = psci_features(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND));
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if (ret != PSCI_RET_NOT_SUPPORTED)
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suspend_set_ops(&psci_suspend_ops);
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}
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static void __init psci_init_cpu_suspend(void)
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{
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int feature = psci_features(psci_function_id[PSCI_FN_CPU_SUSPEND]);
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if (feature != PSCI_RET_NOT_SUPPORTED)
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psci_cpu_suspend_feature = feature;
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}
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/*
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* Detect the presence of a resident Trusted OS which may cause CPU_OFF to
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* return DENIED (which would be fatal).
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*/
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static void __init psci_init_migrate(void)
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{
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unsigned long cpuid;
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int type, cpu = -1;
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type = psci_ops.migrate_info_type();
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if (type == PSCI_0_2_TOS_MP) {
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pr_info("Trusted OS migration not required\n");
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return;
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}
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if (type == PSCI_RET_NOT_SUPPORTED) {
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pr_info("MIGRATE_INFO_TYPE not supported.\n");
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return;
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}
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if (type != PSCI_0_2_TOS_UP_MIGRATE &&
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type != PSCI_0_2_TOS_UP_NO_MIGRATE) {
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pr_err("MIGRATE_INFO_TYPE returned unknown type (%d)\n", type);
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return;
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}
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cpuid = psci_migrate_info_up_cpu();
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if (cpuid & ~MPIDR_HWID_BITMASK) {
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pr_warn("MIGRATE_INFO_UP_CPU reported invalid physical ID (0x%lx)\n",
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cpuid);
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return;
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}
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cpu = get_logical_index(cpuid);
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resident_cpu = cpu >= 0 ? cpu : -1;
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pr_info("Trusted OS resident on physical CPU 0x%lx\n", cpuid);
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}
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static void __init psci_0_2_set_functions(void)
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{
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pr_info("Using standard PSCI v0.2 function IDs\n");
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psci_function_id[PSCI_FN_CPU_SUSPEND] =
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PSCI_FN_NATIVE(0_2, CPU_SUSPEND);
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psci_ops.cpu_suspend = psci_cpu_suspend;
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psci_function_id[PSCI_FN_CPU_OFF] = PSCI_0_2_FN_CPU_OFF;
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psci_ops.cpu_off = psci_cpu_off;
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psci_function_id[PSCI_FN_CPU_ON] = PSCI_FN_NATIVE(0_2, CPU_ON);
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psci_ops.cpu_on = psci_cpu_on;
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psci_function_id[PSCI_FN_MIGRATE] = PSCI_FN_NATIVE(0_2, MIGRATE);
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psci_ops.migrate = psci_migrate;
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psci_ops.affinity_info = psci_affinity_info;
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psci_ops.migrate_info_type = psci_migrate_info_type;
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arm_pm_restart = psci_sys_reset;
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pm_power_off = psci_sys_poweroff;
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}
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/*
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* Probe function for PSCI firmware versions >= 0.2
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*/
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static int __init psci_probe(void)
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{
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u32 ver = psci_get_version();
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pr_info("PSCIv%d.%d detected in firmware.\n",
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PSCI_VERSION_MAJOR(ver),
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PSCI_VERSION_MINOR(ver));
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if (PSCI_VERSION_MAJOR(ver) == 0 && PSCI_VERSION_MINOR(ver) < 2) {
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pr_err("Conflicting PSCI version detected.\n");
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return -EINVAL;
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}
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psci_0_2_set_functions();
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psci_init_migrate();
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if (PSCI_VERSION_MAJOR(ver) >= 1) {
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psci_init_cpu_suspend();
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psci_init_system_suspend();
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}
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return 0;
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}
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typedef int (*psci_initcall_t)(const struct device_node *);
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/*
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* PSCI init function for PSCI versions >=0.2
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*
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* Probe based on PSCI PSCI_VERSION function
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*/
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static int __init psci_0_2_init(struct device_node *np)
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{
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int err;
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err = get_set_conduit_method(np);
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if (err)
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goto out_put_node;
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/*
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* Starting with v0.2, the PSCI specification introduced a call
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* (PSCI_VERSION) that allows probing the firmware version, so
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* that PSCI function IDs and version specific initialization
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* can be carried out according to the specific version reported
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* by firmware
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*/
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err = psci_probe();
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out_put_node:
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of_node_put(np);
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return err;
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}
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/*
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* PSCI < v0.2 get PSCI Function IDs via DT.
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*/
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static int __init psci_0_1_init(struct device_node *np)
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{
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u32 id;
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int err;
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err = get_set_conduit_method(np);
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if (err)
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goto out_put_node;
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pr_info("Using PSCI v0.1 Function IDs from DT\n");
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if (!of_property_read_u32(np, "cpu_suspend", &id)) {
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psci_function_id[PSCI_FN_CPU_SUSPEND] = id;
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psci_ops.cpu_suspend = psci_cpu_suspend;
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}
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if (!of_property_read_u32(np, "cpu_off", &id)) {
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psci_function_id[PSCI_FN_CPU_OFF] = id;
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psci_ops.cpu_off = psci_cpu_off;
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}
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if (!of_property_read_u32(np, "cpu_on", &id)) {
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psci_function_id[PSCI_FN_CPU_ON] = id;
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psci_ops.cpu_on = psci_cpu_on;
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}
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if (!of_property_read_u32(np, "migrate", &id)) {
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psci_function_id[PSCI_FN_MIGRATE] = id;
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psci_ops.migrate = psci_migrate;
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}
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out_put_node:
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of_node_put(np);
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return err;
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}
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static const struct of_device_id const psci_of_match[] __initconst = {
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{ .compatible = "arm,psci", .data = psci_0_1_init},
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{ .compatible = "arm,psci-0.2", .data = psci_0_2_init},
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{ .compatible = "arm,psci-1.0", .data = psci_0_2_init},
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{},
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};
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int __init psci_dt_init(void)
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{
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struct device_node *np;
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const struct of_device_id *matched_np;
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psci_initcall_t init_fn;
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np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
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if (!np)
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return -ENODEV;
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init_fn = (psci_initcall_t)matched_np->data;
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return init_fn(np);
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}
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#ifdef CONFIG_ACPI
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/*
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* We use PSCI 0.2+ when ACPI is deployed on ARM64 and it's
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* explicitly clarified in SBBR
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*/
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int __init psci_acpi_init(void)
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{
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if (!acpi_psci_present()) {
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pr_info("is not implemented in ACPI.\n");
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return -EOPNOTSUPP;
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}
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pr_info("probing for conduit method from ACPI.\n");
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if (acpi_psci_use_hvc())
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invoke_psci_fn = __invoke_psci_fn_hvc;
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else
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invoke_psci_fn = __invoke_psci_fn_smc;
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return psci_probe();
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}
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#endif
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