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