projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 513f52be JM |
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 */ |