// 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 */