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- // 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 */
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