osfmk/kern/cpu_quiesce.h

   1 /*
   2  * Copyright (c) 2018 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef _KERN_CPU_QUIESCE_H_
  30 #define _KERN_CPU_QUIESCE_H_
  31
  32 #ifdef XNU_KERNEL_PRIVATE
  33
  34 #include <sys/cdefs.h>
  35
  36 /* State field kept on each CPU to track participation */
  37 typedef enum {
  38         /* Processor that never participated */
  39         CPU_QUIESCE_COUNTER_NONE = 0,
  40         /* Processor ready to participate, waiting for return to user */
  41         CPU_QUIESCE_COUNTER_PENDING_JOIN = 1,
  42         /* Processor currently participating in counter */
  43         CPU_QUIESCE_COUNTER_JOINED = 2,
  44         /* Processor currently not participating in counter */
  45         CPU_QUIESCE_COUNTER_LEFT = 3,
  46 } cpu_quiescent_state_t;
  47
  48 #if CONFIG_QUIESCE_COUNTER
  49
  50 extern void cpu_quiescent_counter_join(uint64_t ctime);
  51 extern void cpu_quiescent_counter_leave(uint64_t ctime);
  52 extern void cpu_quiescent_counter_checkin(uint64_t ctime);
  53 extern void cpu_quiescent_counter_ast(void);
  54 extern void cpu_quiescent_counter_init(void);
  55
  56 /* use of these is guarded by the config */
  57 extern void cpu_quiescent_counter_set_min_interval_us(uint32_t new_value);
  58 extern uint32_t cpu_quiescent_counter_get_min_interval_us(void);
  59
  60 #else /* CONFIG_QUIESCE_COUNTER */
  61
  62 /* stub routines for platforms without the counter */
  63
  64 static inline void
  65 cpu_quiescent_counter_join(__unused uint64_t ctime)
  66 {
  67 }
  68 static inline void
  69 cpu_quiescent_counter_leave(__unused uint64_t ctime)
  70 {
  71 }
  72 static inline void
  73 cpu_quiescent_counter_checkin(__unused uint64_t ctime)
  74 {
  75 }
  76 static inline void
  77 cpu_quiescent_counter_ast(void)
  78 {
  79 }
  80 static inline void
  81 cpu_quiescent_counter_init(void)
  82 {
  83 }
  84
  85 #endif /* CONFIG_QUIESCE_COUNTER */
  86
  87 #if MACH_ASSERT && CONFIG_QUIESCE_COUNTER
  88 extern void cpu_quiescent_counter_assert_ast(void);
  89 #else
  90 static inline void
  91 cpu_quiescent_counter_assert_ast(void)
  92 {
  93 }
  94 #endif
  95
  96 #endif /* XNU_KERNEL_PRIVATE */
  97
  98 #endif /* _KERN_CPU_QUIESCE_H_ */