include/linux/arm_sdei.h

   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
   5
   6 #include <uapi/linux/arm_sdei.h>
   7
   8 enum sdei_conduit_types {
   9         CONDUIT_INVALID = 0,
  10         CONDUIT_SMC,
  11         CONDUIT_HVC,
  12 };
  13
  14 #include <asm/sdei.h>
  15
  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)
  19 #endif
  20
  21 /*
  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.
  24  */
  25 typedef int (sdei_event_callback)(u32 event, struct pt_regs *regs, void *arg);
  26
  27 /*
  28  * Register your callback to claim an event. The event must be described
  29  * by firmware.
  30  */
  31 int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg);
  32
  33 /*
  34  * Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling
  35  * it until it succeeds.
  36  */
  37 int sdei_event_unregister(u32 event_num);
  38
  39 int sdei_event_enable(u32 event_num);
  40 int sdei_event_disable(u32 event_num);
  41
  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);
  46 #else
  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 */
  50
  51
  52 /*
  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.
  59  *
  60  * For CPU private events, this structure is per-cpu.
  61  */
  62 struct sdei_registered_event {
  63         /* For use by arch code: */
  64         struct pt_regs          interrupted_regs;
  65
  66         sdei_event_callback     *callback;
  67         void                    *callback_arg;
  68         u32                      event_num;
  69         u8                       priority;
  70 };
  71
  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);
  75
  76 /* arch code may use this to retrieve the extra registers. */
  77 int sdei_api_event_context(u32 query, u64 *result);
  78
  79 #endif /* __LINUX_ARM_SDEI_H */