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1// SPDX-License-Identifier: GPL-2.02// Copyright (C) 2017 Arm Ltd.3#ifndef __LINUX_ARM_SDEI_H4#define __LINUX_ARM_SDEI_H5 6#include <uapi/linux/arm_sdei.h>7 8#include <acpi/ghes.h>9 10#ifdef CONFIG_ARM_SDE_INTERFACE11#include <asm/sdei.h>12#endif13 14/* Arch code should override this to set the entry point from firmware... */15#ifndef sdei_arch_get_entry_point16#define sdei_arch_get_entry_point(conduit) (0)17#endif18 19/*20 * When an event occurs sdei_event_handler() will call a user-provided callback21 * like this in NMI context on the CPU that received the event.22 */23typedef int (sdei_event_callback)(u32 event, struct pt_regs *regs, void *arg);24 25/*26 * Register your callback to claim an event. The event must be described27 * by firmware.28 */29int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg);30 31/*32 * Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling33 * it until it succeeds.34 */35int sdei_event_unregister(u32 event_num);36 37int sdei_event_enable(u32 event_num);38int sdei_event_disable(u32 event_num);39 40/* GHES register/unregister helpers */41int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,42 sdei_event_callback *critical_cb);43int sdei_unregister_ghes(struct ghes *ghes);44 45#ifdef CONFIG_ARM_SDE_INTERFACE46/* For use by arch code when CPU hotplug notifiers are not appropriate. */47int sdei_mask_local_cpu(void);48int sdei_unmask_local_cpu(void);49void __init sdei_init(void);50void sdei_handler_abort(void);51#else52static inline int sdei_mask_local_cpu(void) { return 0; }53static inline int sdei_unmask_local_cpu(void) { return 0; }54static inline void sdei_init(void) { }55static inline void sdei_handler_abort(void) { }56#endif /* CONFIG_ARM_SDE_INTERFACE */57 58 59/*60 * This struct represents an event that has been registered. The driver61 * maintains a list of all events, and which ones are registered. (Private62 * events have one entry in the list, but are registered on each CPU).63 * A pointer to this struct is passed to firmware, and back to the event64 * handler. The event handler can then use this to invoke the registered65 * callback, without having to walk the list.66 *67 * For CPU private events, this structure is per-cpu.68 */69struct sdei_registered_event {70 /* For use by arch code: */71 struct pt_regs interrupted_regs;72 73 sdei_event_callback *callback;74 void *callback_arg;75 u32 event_num;76 u8 priority;77};78 79/* The arch code entry point should then call this when an event arrives. */80int notrace sdei_event_handler(struct pt_regs *regs,81 struct sdei_registered_event *arg);82 83/* arch code may use this to retrieve the extra registers. */84int sdei_api_event_context(u32 query, u64 *result);85 86#endif /* __LINUX_ARM_SDEI_H */87