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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2017 Arm Ltd.
#ifndef __LINUX_ARM_SDEI_H
#define __LINUX_ARM_SDEI_H
#include <uapi/linux/arm_sdei.h>
#include <acpi/ghes.h>
#ifdef CONFIG_ARM_SDE_INTERFACE
#include <asm/sdei.h>
#endif
/* Arch code should override this to set the entry point from firmware... */
#ifndef sdei_arch_get_entry_point
#define sdei_arch_get_entry_point(conduit) (0)
#endif
/*
* When an event occurs sdei_event_handler() will call a user-provided callback
* like this in NMI context on the CPU that received the event.
*/
typedef int (sdei_event_callback)(u32 event, struct pt_regs *regs, void *arg);
/*
* Register your callback to claim an event. The event must be described
* by firmware.
*/
int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg);
/*
* Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling
* it until it succeeds.
*/
int sdei_event_unregister(u32 event_num);
int sdei_event_enable(u32 event_num);
int sdei_event_disable(u32 event_num);
/* GHES register/unregister helpers */
int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
sdei_event_callback *critical_cb);
int sdei_unregister_ghes(struct ghes *ghes);
#ifdef CONFIG_ARM_SDE_INTERFACE
/* For use by arch code when CPU hotplug notifiers are not appropriate. */
int sdei_mask_local_cpu(void);
int sdei_unmask_local_cpu(void);
void __init sdei_init(void);
#else
static inline int sdei_mask_local_cpu(void) { return 0; }
static inline int sdei_unmask_local_cpu(void) { return 0; }
static inline void sdei_init(void) { }
#endif /* CONFIG_ARM_SDE_INTERFACE */
/*
* This struct represents an event that has been registered. The driver
* maintains a list of all events, and which ones are registered. (Private
* events have one entry in the list, but are registered on each CPU).
* A pointer to this struct is passed to firmware, and back to the event
* handler. The event handler can then use this to invoke the registered
* callback, without having to walk the list.
*
* For CPU private events, this structure is per-cpu.
*/
struct sdei_registered_event {
/* For use by arch code: */
struct pt_regs interrupted_regs;
sdei_event_callback *callback;
void *callback_arg;
u32 event_num;
u8 priority;
};
/* The arch code entry point should then call this when an event arrives. */
int notrace sdei_event_handler(struct pt_regs *regs,
struct sdei_registered_event *arg);
/* arch code may use this to retrieve the extra registers. */
int sdei_api_event_context(u32 query, u64 *result);
#endif /* __LINUX_ARM_SDEI_H */
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