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