root/include/linux/arm_sdei.h

INCLUDED FROM

DEFINITIONS

1. sdei_mask_local_cpu
2. sdei_unmask_local_cpu

   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 <acpi/ghes.h>
  15 
  16 #ifdef CONFIG_ARM_SDE_INTERFACE
  17 #include <asm/sdei.h>
  18 #endif
  19 
  20 /* Arch code should override this to set the entry point from firmware... */
  21 #ifndef sdei_arch_get_entry_point
  22 #define sdei_arch_get_entry_point(conduit)      (0)
  23 #endif
  24 
  25 /*
  26  * When an event occurs sdei_event_handler() will call a user-provided callback
  27  * like this in NMI context on the CPU that received the event.
  28  */
  29 typedef int (sdei_event_callback)(u32 event, struct pt_regs *regs, void *arg);
  30 
  31 /*
  32  * Register your callback to claim an event. The event must be described
  33  * by firmware.
  34  */
  35 int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg);
  36 
  37 /*
  38  * Calls to sdei_event_unregister() may return EINPROGRESS. Keep calling
  39  * it until it succeeds.
  40  */
  41 int sdei_event_unregister(u32 event_num);
  42 
  43 int sdei_event_enable(u32 event_num);
  44 int sdei_event_disable(u32 event_num);
  45 
  46 /* GHES register/unregister helpers */
  47 int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
  48                        sdei_event_callback *critical_cb);
  49 int sdei_unregister_ghes(struct ghes *ghes);
  50 
  51 #ifdef CONFIG_ARM_SDE_INTERFACE
  52 /* For use by arch code when CPU hotplug notifiers are not appropriate. */
  53 int sdei_mask_local_cpu(void);
  54 int sdei_unmask_local_cpu(void);
  55 #else
  56 static inline int sdei_mask_local_cpu(void) { return 0; }
  57 static inline int sdei_unmask_local_cpu(void) { return 0; }
  58 #endif /* CONFIG_ARM_SDE_INTERFACE */
  59 
  60 
  61 /*
  62  * This struct represents an event that has been registered. The driver
  63  * maintains a list of all events, and which ones are registered. (Private
  64  * events have one entry in the list, but are registered on each CPU).
  65  * A pointer to this struct is passed to firmware, and back to the event
  66  * handler. The event handler can then use this to invoke the registered
  67  * callback, without having to walk the list.
  68  *
  69  * For CPU private events, this structure is per-cpu.
  70  */
  71 struct sdei_registered_event {
  72         /* For use by arch code: */
  73         struct pt_regs          interrupted_regs;
  74 
  75         sdei_event_callback     *callback;
  76         void                    *callback_arg;
  77         u32                      event_num;
  78         u8                       priority;
  79 };
  80 
  81 /* The arch code entry point should then call this when an event arrives. */
  82 int notrace sdei_event_handler(struct pt_regs *regs,
  83                                struct sdei_registered_event *arg);
  84 
  85 /* arch code may use this to retrieve the extra registers. */
  86 int sdei_api_event_context(u32 query, u64 *result);
  87 
  88 #endif /* __LINUX_ARM_SDEI_H */