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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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Kiryl Shutsemau (Meta)
9141eda9ee
Add sdei_event_signal(), a thin wrapper over the SDEI_EVENT_SIGNAL call (DEN0054) that makes the software-signalled event (event 0) pending on a target PE -- delivered NMI-like even when that PE has interrupts masked. It takes no locks, so it is safe to call from NMI / crash context. Signed-off-by: Kiryl Shutsemau (Meta) <kas@kernel.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Yin Fengwei <fengwei_yin@linux.alibaba.com> Signed-off-by: Will Deacon <will@kernel.org>
96 lines
2.9 KiB
C
96 lines
2.9 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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#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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/*
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* Signal the software-signalled event (event 0) to another PE, NMI-like.
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* @mpidr is the target's MPIDR affinity.
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*/
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int sdei_event_signal(u32 event_num, u64 mpidr);
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/* Was SDEI firmware probed and usable? */
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bool sdei_is_present(void);
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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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void __init acpi_sdei_init(void);
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void sdei_handler_abort(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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static inline void acpi_sdei_init(void) { }
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static inline void sdei_handler_abort(void) { }
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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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