osfmk/kern/timer_queue.h

   1 /*
   2  * Copyright (c) 2008 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.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Timer queue support routines.
  30  */
  31
  32 #ifndef _KERN_TIMER_QUEUE_H_
  33 #define _KERN_TIMER_QUEUE_H_
  34
  35 #include <mach/mach_types.h>
  36
  37 #ifdef MACH_KERNEL_PRIVATE
  38
  39 #include <kern/queue.h>
  40
  41 /* Kernel trace events associated with timers and timer queues */
  42 #define DECR_TRAP_LATENCY       MACHDBG_CODE(DBG_MACH_EXCP_DECI, 0)
  43 #define DECR_SET_DEADLINE       MACHDBG_CODE(DBG_MACH_EXCP_DECI, 1)
  44 #define DECR_TIMER_CALLOUT      MACHDBG_CODE(DBG_MACH_EXCP_DECI, 2)
  45 #define DECR_PM_DEADLINE        MACHDBG_CODE(DBG_MACH_EXCP_DECI, 3)
  46 #define DECR_TIMER_MIGRATE      MACHDBG_CODE(DBG_MACH_EXCP_DECI, 4)
  47 #if defined(i386) || defined(x86_64)
  48 #define DECR_RDHPET             MACHDBG_CODE(DBG_MACH_EXCP_DECI, 5)
  49 #define DECR_SET_TSC_DEADLINE   MACHDBG_CODE(DBG_MACH_EXCP_DECI, 6)
  50 #define DECR_SET_APIC_DEADLINE  MACHDBG_CODE(DBG_MACH_EXCP_DECI, 16)
  51 #endif
  52 #define DECR_TIMER_ENTER        MACHDBG_CODE(DBG_MACH_EXCP_DECI, 7)
  53 #define DECR_TIMER_CANCEL       MACHDBG_CODE(DBG_MACH_EXCP_DECI, 8)
  54 #define DECR_TIMER_QUEUE        MACHDBG_CODE(DBG_MACH_EXCP_DECI, 9)
  55 #define DECR_TIMER_EXPIRE       MACHDBG_CODE(DBG_MACH_EXCP_DECI,10)
  56 #define DECR_TIMER_ASYNC_DEQ    MACHDBG_CODE(DBG_MACH_EXCP_DECI,11)
  57 #define DECR_TIMER_UPDATE       MACHDBG_CODE(DBG_MACH_EXCP_DECI,12)
  58 #define DECR_TIMER_ESCALATE     MACHDBG_CODE(DBG_MACH_EXCP_DECI,13)
  59 #define DECR_TIMER_OVERDUE      MACHDBG_CODE(DBG_MACH_EXCP_DECI,14)
  60 #define DECR_TIMER_RESCAN       MACHDBG_CODE(DBG_MACH_EXCP_DECI,15)
  61
  62 /*
  63  *      Invoked by kernel, implemented by platform.
  64  */
  65
  66 /* Request an expiration deadline, returns queue association */
  67 extern mpqueue_head_t * timer_queue_assign(
  68                                 uint64_t                deadline);
  69
  70 extern uint64_t         timer_call_slop(
  71                                 uint64_t                deadline,
  72                                 uint64_t                armtime,
  73                                 uint32_t                urgency,
  74                                 thread_t                arming_thread,
  75                                 boolean_t               *rlimited);
  76 extern boolean_t        timer_resort_threshold(uint64_t);
  77
  78 /* Cancel an associated expiration deadline and specify new deadline */
  79 extern void             timer_queue_cancel(
  80                                 mpqueue_head_t          *queue,
  81                                 uint64_t                deadline,
  82                                 uint64_t                new_deadline);
  83
  84 /* Return a pointer to the local timer queue for a given cpu */
  85 extern mpqueue_head_t * timer_queue_cpu(
  86                                 int                     cpu);
  87
  88 /* Call a function with argument on a cpu */
  89 extern void             timer_call_cpu(
  90                                 int                     cpu,
  91                                 void                    (*fn)(void *),
  92                                 void                    *arg);
  93
  94 /* Queue a function to be called with argument on a cpu */
  95 extern void             timer_call_nosync_cpu(
  96                                 int                     cpu,
  97                                 void                    (*fn)(void *),
  98                                 void                    *arg);
  99
 100 /*
 101  *      Invoked by platform, implemented by kernel.
 102  */
 103
 104 /*
 105  *      Invoked by kernel, implemented by platform.
 106  */
 107
 108 #define NUM_LATENCY_QOS_TIERS (6)
 109
 110 typedef struct {
 111         uint32_t idle_entry_timer_processing_hdeadline_threshold_ns;
 112         uint32_t interrupt_timer_coalescing_ilat_threshold_ns;
 113         uint32_t timer_resort_threshold_ns;
 114
 115         int32_t timer_coalesce_rt_shift;
 116         int32_t timer_coalesce_bg_shift;
 117         int32_t timer_coalesce_kt_shift;
 118         int32_t timer_coalesce_fp_shift;
 119         int32_t timer_coalesce_ts_shift;
 120
 121         uint64_t timer_coalesce_rt_ns_max;
 122         uint64_t timer_coalesce_bg_ns_max;
 123         uint64_t timer_coalesce_kt_ns_max;
 124         uint64_t timer_coalesce_fp_ns_max;
 125         uint64_t timer_coalesce_ts_ns_max;
 126
 127         uint32_t latency_qos_scale[NUM_LATENCY_QOS_TIERS];
 128         uint64_t latency_qos_ns_max[NUM_LATENCY_QOS_TIERS];
 129         boolean_t latency_tier_rate_limited[NUM_LATENCY_QOS_TIERS];
 130 } timer_coalescing_priority_params_ns_t;
 131
 132 extern timer_coalescing_priority_params_ns_t * timer_call_get_priority_params(void);
 133
 134
 135 extern uint64_t         timer_call_slop(
 136         uint64_t                deadline,
 137         uint64_t                armtime,
 138         uint32_t                urgency,
 139         thread_t                arming_thread,
 140         boolean_t               *rlimited);
 141
 142 /* Process deadline expiration for queue, returns new deadline */
 143 extern uint64_t         timer_queue_expire(
 144                                 mpqueue_head_t          *queue,
 145                                 uint64_t                deadline);
 146
 147 extern uint64_t         timer_queue_expire_with_options(
 148                                 mpqueue_head_t *,
 149                                 uint64_t,
 150                                 boolean_t);
 151
 152 /* Shutdown a timer queue and reassign existing activities */
 153 extern void             timer_queue_shutdown(
 154                                 mpqueue_head_t          *queue);
 155
 156 /* Move timer requests from one queue to another */
 157 extern int              timer_queue_migrate(
 158                                 mpqueue_head_t          *from,
 159                                 mpqueue_head_t          *to);
 160
 161 /*
 162  *      Invoked by platform, implemented by platfrom.
 163  */
 164
 165 extern void             timer_intr(int inuser, uint64_t iaddr);
 166
 167 #if defined(i386) || defined(x86_64)
 168 extern uint64_t         setPop(uint64_t time);
 169 #else
 170 extern int              setPop(uint64_t time);
 171 #endif
 172
 173 extern void             timer_resync_deadlines(void);
 174
 175 extern void             timer_set_deadline(uint64_t deadline);
 176
 177 /* Migrate the local timer queue of a given cpu to the master cpu */
 178 extern uint32_t         timer_queue_migrate_cpu(int target_cpu);
 179
 180 extern void             timer_queue_trace(
 181                                 mpqueue_head_t          *queue);
 182 extern void             timer_queue_trace_cpu(int cpu);
 183
 184 extern uint64_t         timer_sysctl_get(int oid);
 185 extern int              timer_sysctl_set(int oid, uint64_t value);
 186
 187 #endif  /* MACH_KERNEL_PRIVATE */
 188
 189 #endif  /* _KERN_TIMER_QUEUE_H_ */