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