f9f05395f3
If the GHES notification type is SDEI, register the provided event using the SDEI-GHES helper. SDEI may be one of two types of event, normal and critical. Critical events can interrupt normal events, so these must have separate fixmap slots and locks in case both event types are in use. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
89 lines
2.6 KiB
C
89 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2017 Arm Ltd.
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#ifndef __LINUX_ARM_SDEI_H
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#define __LINUX_ARM_SDEI_H
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#include <uapi/linux/arm_sdei.h>
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enum sdei_conduit_types {
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CONDUIT_INVALID = 0,
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CONDUIT_SMC,
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CONDUIT_HVC,
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};
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#include <acpi/ghes.h>
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#ifdef CONFIG_ARM_SDE_INTERFACE
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#include <asm/sdei.h>
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#endif
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/* Arch code should override this to set the entry point from firmware... */
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#ifndef sdei_arch_get_entry_point
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#define sdei_arch_get_entry_point(conduit) (0)
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#endif
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/*
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* When an event occurs sdei_event_handler() will call a user-provided callback
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* like this in NMI context on the CPU that received the event.
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*/
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typedef int (sdei_event_callback)(u32 event, struct pt_regs *regs, void *arg);
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/*
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* Register your callback to claim an event. The event must be described
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* by firmware.
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*/
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int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg);
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/*
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* Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling
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* it until it succeeds.
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*/
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int sdei_event_unregister(u32 event_num);
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int sdei_event_enable(u32 event_num);
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int sdei_event_disable(u32 event_num);
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/* GHES register/unregister helpers */
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int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
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sdei_event_callback *critical_cb);
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int sdei_unregister_ghes(struct ghes *ghes);
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#ifdef CONFIG_ARM_SDE_INTERFACE
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/* For use by arch code when CPU hotplug notifiers are not appropriate. */
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int sdei_mask_local_cpu(void);
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int sdei_unmask_local_cpu(void);
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#else
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static inline int sdei_mask_local_cpu(void) { return 0; }
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static inline int sdei_unmask_local_cpu(void) { return 0; }
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#endif /* CONFIG_ARM_SDE_INTERFACE */
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/*
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* This struct represents an event that has been registered. The driver
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* maintains a list of all events, and which ones are registered. (Private
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* events have one entry in the list, but are registered on each CPU).
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* A pointer to this struct is passed to firmware, and back to the event
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* handler. The event handler can then use this to invoke the registered
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* callback, without having to walk the list.
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*
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* For CPU private events, this structure is per-cpu.
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*/
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struct sdei_registered_event {
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/* For use by arch code: */
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struct pt_regs interrupted_regs;
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sdei_event_callback *callback;
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void *callback_arg;
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u32 event_num;
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u8 priority;
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};
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/* The arch code entry point should then call this when an event arrives. */
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int notrace sdei_event_handler(struct pt_regs *regs,
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struct sdei_registered_event *arg);
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/* arch code may use this to retrieve the extra registers. */
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int sdei_api_event_context(u32 query, u64 *result);
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#endif /* __LINUX_ARM_SDEI_H */
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