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1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2017 Arm Ltd.
3#ifndef __LINUX_ARM_SDEI_H
4#define __LINUX_ARM_SDEI_H
5
6#include <uapi/linux/arm_sdei.h>
7
8#include <acpi/ghes.h>
9
10#ifdef CONFIG_ARM_SDE_INTERFACE
11#include <asm/sdei.h>
12#endif
13
14/* Arch code should override this to set the entry point from firmware... */
15#ifndef sdei_arch_get_entry_point
16#define sdei_arch_get_entry_point(conduit) (0)
17#endif
18
19/*
20 * When an event occurs sdei_event_handler() will call a user-provided callback
21 * 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 described
27 * 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 calling
33 * 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/*
41 * Signal the software-signalled event (event 0) to another PE, NMI-like.
42 * @mpidr is the target's MPIDR affinity.
43 */
44int sdei_event_signal(u32 event_num, u64 mpidr);
45
46/* Was SDEI firmware probed and usable? */
47bool sdei_is_present(void);
48
49/* GHES register/unregister helpers */
50int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
51 sdei_event_callback *critical_cb);
52int sdei_unregister_ghes(struct ghes *ghes);
53
54#ifdef CONFIG_ARM_SDE_INTERFACE
55/* For use by arch code when CPU hotplug notifiers are not appropriate. */
56int sdei_mask_local_cpu(void);
57int sdei_unmask_local_cpu(void);
58void __init acpi_sdei_init(void);
59void sdei_handler_abort(void);
60#else
61static inline int sdei_mask_local_cpu(void) { return 0; }
62static inline int sdei_unmask_local_cpu(void) { return 0; }
63static inline void acpi_sdei_init(void) { }
64static inline void sdei_handler_abort(void) { }
65#endif /* CONFIG_ARM_SDE_INTERFACE */
66
67
68/*
69 * This struct represents an event that has been registered. The driver
70 * maintains a list of all events, and which ones are registered. (Private
71 * events have one entry in the list, but are registered on each CPU).
72 * A pointer to this struct is passed to firmware, and back to the event
73 * handler. The event handler can then use this to invoke the registered
74 * callback, without having to walk the list.
75 *
76 * For CPU private events, this structure is per-cpu.
77 */
78struct sdei_registered_event {
79 /* For use by arch code: */
80 struct pt_regs interrupted_regs;
81
82 sdei_event_callback *callback;
83 void *callback_arg;
84 u32 event_num;
85 u8 priority;
86};
87
88/* The arch code entry point should then call this when an event arrives. */
89int notrace sdei_event_handler(struct pt_regs *regs,
90 struct sdei_registered_event *arg);
91
92/* arch code may use this to retrieve the extra registers. */
93int sdei_api_event_context(u32 query, u64 *result);
94
95#endif /* __LINUX_ARM_SDEI_H */