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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>
10 #ifdef CONFIG_ARM_SDE_INTERFACE
14 /* Arch code should override this to set the entry point from firmware... */
15 #ifndef sdei_arch_get_entry_point
16 #define sdei_arch_get_entry_point(conduit) (0)
20 * When an event occurs sdei_event_handler() will call a user-provided callback
21 * like this in NMI context on the CPU that received the event.
23 typedef int (sdei_event_callback
)(u32 event
, struct pt_regs
*regs
, void *arg
);
26 * Register your callback to claim an event. The event must be described
29 int sdei_event_register(u32 event_num
, sdei_event_callback
*cb
, void *arg
);
32 * Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling
33 * it until it succeeds.
35 int sdei_event_unregister(u32 event_num
);
37 int sdei_event_enable(u32 event_num
);
38 int sdei_event_disable(u32 event_num
);
40 /* GHES register/unregister helpers */
41 int sdei_register_ghes(struct ghes
*ghes
, sdei_event_callback
*normal_cb
,
42 sdei_event_callback
*critical_cb
);
43 int sdei_unregister_ghes(struct ghes
*ghes
);
45 #ifdef CONFIG_ARM_SDE_INTERFACE
46 /* For use by arch code when CPU hotplug notifiers are not appropriate. */
47 int sdei_mask_local_cpu(void);
48 int sdei_unmask_local_cpu(void);
50 static inline int sdei_mask_local_cpu(void) { return 0; }
51 static inline int sdei_unmask_local_cpu(void) { return 0; }
52 #endif /* CONFIG_ARM_SDE_INTERFACE */
56 * This struct represents an event that has been registered. The driver
57 * maintains a list of all events, and which ones are registered. (Private
58 * events have one entry in the list, but are registered on each CPU).
59 * A pointer to this struct is passed to firmware, and back to the event
60 * handler. The event handler can then use this to invoke the registered
61 * callback, without having to walk the list.
63 * For CPU private events, this structure is per-cpu.
65 struct sdei_registered_event
{
66 /* For use by arch code: */
67 struct pt_regs interrupted_regs
;
69 sdei_event_callback
*callback
;
75 /* The arch code entry point should then call this when an event arrives. */
76 int notrace
sdei_event_handler(struct pt_regs
*regs
,
77 struct sdei_registered_event
*arg
);
79 /* arch code may use this to retrieve the extra registers. */
80 int sdei_api_event_context(u32 query
, u64
*result
);
82 #endif /* __LINUX_ARM_SDEI_H */