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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 | enum sdei_conduit_types { | |
9 | CONDUIT_INVALID = 0, | |
10 | CONDUIT_SMC, | |
11 | CONDUIT_HVC, | |
12 | }; | |
13 | ||
f96935d3 | 14 | #include <acpi/ghes.h> |
f9f05395 JM |
15 | |
16 | #ifdef CONFIG_ARM_SDE_INTERFACE | |
ad6eb31e | 17 | #include <asm/sdei.h> |
f9f05395 | 18 | #endif |
ad6eb31e JM |
19 | |
20 | /* Arch code should override this to set the entry point from firmware... */ | |
21 | #ifndef sdei_arch_get_entry_point | |
22 | #define sdei_arch_get_entry_point(conduit) (0) | |
23 | #endif | |
24 | ||
25 | /* | |
26 | * When an event occurs sdei_event_handler() will call a user-provided callback | |
27 | * like this in NMI context on the CPU that received the event. | |
28 | */ | |
29 | typedef int (sdei_event_callback)(u32 event, struct pt_regs *regs, void *arg); | |
30 | ||
31 | /* | |
32 | * Register your callback to claim an event. The event must be described | |
33 | * by firmware. | |
34 | */ | |
35 | int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg); | |
36 | ||
37 | /* | |
38 | * Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling | |
39 | * it until it succeeds. | |
40 | */ | |
41 | int sdei_event_unregister(u32 event_num); | |
42 | ||
43 | int sdei_event_enable(u32 event_num); | |
44 | int sdei_event_disable(u32 event_num); | |
45 | ||
f96935d3 JM |
46 | /* GHES register/unregister helpers */ |
47 | int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb, | |
48 | sdei_event_callback *critical_cb); | |
49 | int sdei_unregister_ghes(struct ghes *ghes); | |
50 | ||
ad6eb31e JM |
51 | #ifdef CONFIG_ARM_SDE_INTERFACE |
52 | /* For use by arch code when CPU hotplug notifiers are not appropriate. */ | |
53 | int sdei_mask_local_cpu(void); | |
54 | int sdei_unmask_local_cpu(void); | |
55 | #else | |
56 | static inline int sdei_mask_local_cpu(void) { return 0; } | |
57 | static inline int sdei_unmask_local_cpu(void) { return 0; } | |
58 | #endif /* CONFIG_ARM_SDE_INTERFACE */ | |
59 | ||
60 | ||
61 | /* | |
62 | * This struct represents an event that has been registered. The driver | |
63 | * maintains a list of all events, and which ones are registered. (Private | |
64 | * events have one entry in the list, but are registered on each CPU). | |
65 | * A pointer to this struct is passed to firmware, and back to the event | |
66 | * handler. The event handler can then use this to invoke the registered | |
67 | * callback, without having to walk the list. | |
68 | * | |
69 | * For CPU private events, this structure is per-cpu. | |
70 | */ | |
71 | struct sdei_registered_event { | |
72 | /* For use by arch code: */ | |
73 | struct pt_regs interrupted_regs; | |
74 | ||
75 | sdei_event_callback *callback; | |
76 | void *callback_arg; | |
77 | u32 event_num; | |
78 | u8 priority; | |
79 | }; | |
80 | ||
81 | /* The arch code entry point should then call this when an event arrives. */ | |
82 | int notrace sdei_event_handler(struct pt_regs *regs, | |
83 | struct sdei_registered_event *arg); | |
84 | ||
85 | /* arch code may use this to retrieve the extra registers. */ | |
86 | int sdei_api_event_context(u32 query, u64 *result); | |
87 | ||
88 | #endif /* __LINUX_ARM_SDEI_H */ |