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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
6 #include <uapi/linux/arm_sdei.h>
8 enum sdei_conduit_types
{
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)
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.
25 typedef int (sdei_event_callback
)(u32 event
, struct pt_regs
*regs
, void *arg
);
28 * Register your callback to claim an event. The event must be described
31 int sdei_event_register(u32 event_num
, sdei_event_callback
*cb
, void *arg
);
34 * Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling
35 * it until it succeeds.
37 int sdei_event_unregister(u32 event_num
);
39 int sdei_event_enable(u32 event_num
);
40 int sdei_event_disable(u32 event_num
);
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);
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 */
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.
60 * For CPU private events, this structure is per-cpu.
62 struct sdei_registered_event
{
63 /* For use by arch code: */
64 struct pt_regs interrupted_regs
;
66 sdei_event_callback
*callback
;
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
);
76 /* arch code may use this to retrieve the extra registers. */
77 int sdei_api_event_context(u32 query
, u64
*result
);
79 #endif /* __LINUX_ARM_SDEI_H */