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https://mirrors.bfsu.edu.cn/git/linux.git
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77d34a4683
- Make it clear __swp_entry_to_pte() uses PTE_TYPE_FAULT - Updates for setting vmalloc size via command line to resolve an issue with the 8MiB hole not properly being accounted for, and clean up the code. - ftrace support for module PLTs - Spelling fixes - kbuild updates for removing generated files and pattern rules for generating files - Clang/llvm updates - Change the way the kernel is mapped, placing it in vmalloc space instead. - Remove arm_pm_restart from arm and aarch64. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEuNNh8scc2k/wOAE+9OeQG+StrGQFAmDi5ewACgkQ9OeQG+St rGRfLg//cWUq/FBgRWggSgvLGBnbqwJABKFnynVy7c+g+kPxNudDHjL9a2A8c6aR oTBMzaQvfRCQA2drgGK2fZ02sCHJxStX8d6Y6WyVaVEIBZPH6y09gZy1wW0/fIZS S8qk82WaASddk/kvNeFrWD/5qNT4tz8COndZeYbBpEsXw/5RjIqSQqyn0k5CZqUj 0lL95y1AW9vD9AH7OYyYMB6pLwDMt0LCTSynx/o6ZmaysX56KdM8c3ziiUllWwJB TIR03DeSpCZMiJMjwZUiWVl2BLjTES9WE2klZYulhgfh+ljlhkHvO+i8B+qy8kDS JHIXHnuMi3GjSFg6MlP/s21pLHT6yuCZ8dSGaACa+HEf1s0nRnE9wl2kzUFcJtLY jHAE5YyvO0BLJHCMuRGiB77rKwI92ij4yxKHvchU0BRlpgaVYcBmhZfqdVGnB4VO Mu2pMaHLzEdrkfLteYJ7bvKn0o5cD/G3wj/9UDAzJ6ME91LINiNqzgub68pf1KTe /YipxKipqcpbSBeysZAkfqTbMNB5WuxNnfmgwU15ZyfZsalcXSYEDkYex5+GGgOc w36VddVtQXNKd0LuCfoquda3hIjLvgCNf62ZDFNDXgOHcVu8okYXwZi9vyYg6xIn 0gfh/T/lK0DoLWul0/CuLpSnsjw+1T7WTgKlvgLYGusWIQ2mC7w= =dq60 -----END PGP SIGNATURE----- Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm Pull ARM development updates from Russell King: - Make it clear __swp_entry_to_pte() uses PTE_TYPE_FAULT - Updates for setting vmalloc size via command line to resolve an issue with the 8MiB hole not properly being accounted for, and clean up the code. - ftrace support for module PLTs - Spelling fixes - kbuild updates for removing generated files and pattern rules for generating files - Clang/llvm updates - Change the way the kernel is mapped, placing it in vmalloc space instead. - Remove arm_pm_restart from arm and aarch64. * tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm: (29 commits) ARM: 9098/1: ftrace: MODULE_PLT: Fix build problem without DYNAMIC_FTRACE ARM: 9097/1: mmu: Declare section start/end correctly ARM: 9096/1: Remove arm_pm_restart() ARM: 9095/1: ARM64: Remove arm_pm_restart() ARM: 9094/1: Register with kernel restart handler ARM: 9093/1: drivers: firmwapsci: Register with kernel restart handler ARM: 9092/1: xen: Register with kernel restart handler ARM: 9091/1: Revert "mm: qsd8x50: Fix incorrect permission faults" ARM: 9090/1: Map the lowmem and kernel separately ARM: 9089/1: Define kernel physical section start and end ARM: 9088/1: Split KERNEL_OFFSET from PAGE_OFFSET ARM: 9087/1: kprobes: test-thumb: fix for LLVM_IAS=1 ARM: 9086/1: syscalls: use pattern rules to generate syscall headers ARM: 9085/1: remove unneeded abi parameter to syscallnr.sh ARM: 9084/1: simplify the build rule of mach-types.h ARM: 9083/1: uncompress: atags_to_fdt: Spelling s/REturn/Return/ ARM: 9082/1: [v2] mark prepare_page_table as __init ARM: 9079/1: ftrace: Add MODULE_PLTS support ARM: 9078/1: Add warn suppress parameter to arm_gen_branch_link() ARM: 9077/1: PLT: Move struct plt_entries definition to header ...
654 lines
15 KiB
C
654 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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/acpi.h>
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#include <linux/arm-smccc.h>
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#include <linux/cpuidle.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/slab.h>
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#include <linux/suspend.h>
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#include <uapi/linux/psci.h>
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#include <asm/cpuidle.h>
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#include <asm/cputype.h>
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#include <asm/hypervisor.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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struct psci_operations psci_ops;
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static enum arm_smccc_conduit psci_conduit = SMCCC_CONDUIT_NONE;
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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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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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static struct psci_0_1_function_ids psci_0_1_function_ids;
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struct psci_0_1_function_ids get_psci_0_1_function_ids(void)
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{
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return psci_0_1_function_ids;
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}
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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 bool psci_system_reset2_supported;
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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_has_osi_support(void)
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{
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return psci_cpu_suspend_feature & PSCI_1_0_OS_INITIATED;
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}
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static inline 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_0_1_get_version(void)
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{
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return PSCI_VERSION(0, 1);
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}
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static u32 psci_0_2_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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int psci_set_osi_mode(bool enable)
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{
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unsigned long suspend_mode;
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int err;
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suspend_mode = enable ? PSCI_1_0_SUSPEND_MODE_OSI :
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PSCI_1_0_SUSPEND_MODE_PC;
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err = invoke_psci_fn(PSCI_1_0_FN_SET_SUSPEND_MODE, suspend_mode, 0, 0);
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return psci_to_linux_errno(err);
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}
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static int __psci_cpu_suspend(u32 fn, u32 state, unsigned long entry_point)
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{
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int err;
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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_0_1_cpu_suspend(u32 state, unsigned long entry_point)
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{
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return __psci_cpu_suspend(psci_0_1_function_ids.cpu_suspend,
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state, entry_point);
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}
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static int psci_0_2_cpu_suspend(u32 state, unsigned long entry_point)
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{
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return __psci_cpu_suspend(PSCI_FN_NATIVE(0_2, CPU_SUSPEND),
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state, entry_point);
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}
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static int __psci_cpu_off(u32 fn, u32 state)
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{
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int err;
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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_0_1_cpu_off(u32 state)
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{
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return __psci_cpu_off(psci_0_1_function_ids.cpu_off, state);
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}
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static int psci_0_2_cpu_off(u32 state)
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{
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return __psci_cpu_off(PSCI_0_2_FN_CPU_OFF, state);
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}
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static int __psci_cpu_on(u32 fn, unsigned long cpuid, unsigned long entry_point)
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{
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int err;
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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_0_1_cpu_on(unsigned long cpuid, unsigned long entry_point)
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{
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return __psci_cpu_on(psci_0_1_function_ids.cpu_on, cpuid, entry_point);
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}
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static int psci_0_2_cpu_on(unsigned long cpuid, unsigned long entry_point)
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{
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return __psci_cpu_on(PSCI_FN_NATIVE(0_2, CPU_ON), cpuid, entry_point);
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}
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static int __psci_migrate(u32 fn, unsigned long cpuid)
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{
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int err;
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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_0_1_migrate(unsigned long cpuid)
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{
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return __psci_migrate(psci_0_1_function_ids.migrate, cpuid);
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}
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static int psci_0_2_migrate(unsigned long cpuid)
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{
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return __psci_migrate(PSCI_FN_NATIVE(0_2, MIGRATE), cpuid);
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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 void set_conduit(enum arm_smccc_conduit conduit)
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{
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switch (conduit) {
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case SMCCC_CONDUIT_HVC:
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invoke_psci_fn = __invoke_psci_fn_hvc;
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break;
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case SMCCC_CONDUIT_SMC:
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invoke_psci_fn = __invoke_psci_fn_smc;
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break;
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default:
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WARN(1, "Unexpected PSCI conduit %d\n", conduit);
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}
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psci_conduit = conduit;
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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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set_conduit(SMCCC_CONDUIT_HVC);
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} else if (!strcmp("smc", method)) {
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set_conduit(SMCCC_CONDUIT_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 int psci_sys_reset(struct notifier_block *nb, unsigned long action,
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void *data)
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{
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if ((reboot_mode == REBOOT_WARM || reboot_mode == REBOOT_SOFT) &&
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psci_system_reset2_supported) {
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/*
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* reset_type[31] = 0 (architectural)
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* reset_type[30:0] = 0 (SYSTEM_WARM_RESET)
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* cookie = 0 (ignored by the implementation)
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*/
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invoke_psci_fn(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2), 0, 0, 0);
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} else {
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invoke_psci_fn(PSCI_0_2_FN_SYSTEM_RESET, 0, 0, 0);
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block psci_sys_reset_nb = {
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.notifier_call = psci_sys_reset,
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.priority = 129,
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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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#ifdef CONFIG_CPU_IDLE
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static int psci_suspend_finisher(unsigned long state)
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{
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u32 power_state = state;
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phys_addr_t pa_cpu_resume = __pa_symbol(function_nocfi(cpu_resume));
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return psci_ops.cpu_suspend(power_state, pa_cpu_resume);
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}
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int psci_cpu_suspend_enter(u32 state)
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{
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int ret;
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if (!psci_power_state_loses_context(state)) {
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struct arm_cpuidle_irq_context context;
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arm_cpuidle_save_irq_context(&context);
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ret = psci_ops.cpu_suspend(state, 0);
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arm_cpuidle_restore_irq_context(&context);
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} else {
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ret = cpu_suspend(state, psci_suspend_finisher);
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}
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return ret;
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}
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#endif
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static int psci_system_suspend(unsigned long unused)
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{
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phys_addr_t pa_cpu_resume = __pa_symbol(function_nocfi(cpu_resume));
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return invoke_psci_fn(PSCI_FN_NATIVE(1_0, SYSTEM_SUSPEND),
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pa_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_reset2(void)
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{
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int ret;
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ret = psci_features(PSCI_FN_NATIVE(1_1, SYSTEM_RESET2));
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if (ret != PSCI_RET_NOT_SUPPORTED)
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psci_system_reset2_supported = true;
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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_FN_NATIVE(0_2, 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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}
|
|
|
|
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
|