libkern/firehose/tracepoint_private.h

   1 /*
   2  * Copyright (c) 2013-2016 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_APACHE_LICENSE_HEADER_START@
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  *
  18  * @APPLE_APACHE_LICENSE_HEADER_END@
  19  */
  20
  21 #ifndef __FIREHOSE_ACTIVITY__
  22 #define __FIREHOSE_ACTIVITY__
  23
  24 #include <machine/cpu_capabilities.h>
  25 #include <mach/mach_time.h>
  26 #include <os/base.h>
  27 #if KERNEL
  28 #include <atm/atm_internal.h>
  29 #endif
  30 #include "firehose_types_private.h"
  31
  32 OS_ASSUME_NONNULL_BEGIN
  33
  34 /*!
  35  * @typedef firehose_tracepoint_id_u
  36  *
  37  * @abstract
  38  * Broken down tracepoint identifier.
  39  */
  40 typedef union {
  41         struct {
  42                 firehose_tracepoint_namespace_t _namespace;
  43                 firehose_tracepoint_type_t _type;
  44                 firehose_tracepoint_flags_t _flags;
  45                 uint32_t _code;
  46         } ftid;
  47         firehose_tracepoint_id_t ftid_value;
  48         _Atomic(firehose_tracepoint_id_t) ftid_atomic_value;
  49 } firehose_tracepoint_id_u;
  50
  51 #define FIREHOSE_STAMP_SLOP (1ULL << 36) // ~1minute
  52
  53 /*!
  54  * @typedef firehose_trace_uuid_info_t
  55  *
  56  * @abstract
  57  * Info needed by logd when kexts are loaded or unloaded
  58  *
  59  */
  60 typedef struct firehose_trace_uuid_info_s {
  61         uuid_t ftui_uuid;      /* uuid of binary */
  62         uint64_t ftui_address; /* load address */
  63         uint64_t ftui_size;    /* load size */
  64         char ftui_path[];      /* full path of binary - Unused in the kernel*/
  65 } *firehose_trace_uuid_info_t;
  66
  67 /*!
  68  * @typedef firehose_tracepoint_t
  69  */
  70 typedef struct firehose_tracepoint_s {
  71         firehose_tracepoint_id_u ft_id;
  72         uint64_t ft_thread;
  73         union {
  74                 struct {
  75                         uint64_t ft_timestamp_delta : 48;
  76                         uint64_t ft_length : 16;
  77                 };
  78                 uint64_t ft_stamp_and_length;
  79                 _Atomic(uint64_t) ft_atomic_stamp_and_length;
  80         };
  81         uint8_t ft_data[];
  82 } *firehose_tracepoint_t;
  83
  84 #define FIREHOSE_TRACE_ID_MAKE(ns, type, flags, code) \
  85         (((firehose_tracepoint_id_u){ .ftid = { \
  86                 ._namespace = ns, \
  87                 ._type = type, \
  88                 ._flags = flags, \
  89                 ._code = code, \
  90         } }).ftid_value)
  91
  92 #define FIREHOSE_TRACE_ID_SET_NS(tid, ns) \
  93         ((tid).ftid._namespace = firehose_tracepoint_namespace_##ns)
  94
  95 #define FIREHOSE_TRACE_ID_SET_TYPE(tid, ns, type) \
  96         ((tid).ftid._type = _firehose_tracepoint_type_##ns##_##type)
  97
  98 #define FIREHOSE_TRACE_ID_PC_STYLE(tid) \
  99                 ((tid).ftid._flags & _firehose_tracepoint_flags_pc_style_mask)
 100
 101 #define FIREHOSE_TRACE_ID_SET_PC_STYLE(tid, flag) ({ \
 102                 firehose_tracepoint_id_u _tmp_tid = (tid); \
 103                 _tmp_tid.ftid._flags &= ~_firehose_tracepoint_flags_pc_style_mask; \
 104                 _tmp_tid.ftid._flags |= _firehose_tracepoint_flags_pc_style_##flag; \
 105 })
 106
 107 #define FIREHOSE_TRACE_ID_HAS_FLAG(tid, ns, flag) \
 108         ((tid).ftid._flags & _firehose_tracepoint_flags_##ns##_##flag)
 109 #define FIREHOSE_TRACE_ID_SET_FLAG(tid, ns, flag) \
 110         ((void)((tid).ftid._flags |= _firehose_tracepoint_flags_##ns##_##flag))
 111 #define FIREHOSE_TRACE_ID_CLEAR_FLAG(tid, ns, flag) \
 112         ((void)((tid).ftid._flags &= ~_firehose_tracepoint_flags_##ns##_##flag))
 113
 114 #define FIREHOSE_TRACE_ID_SET_CODE(tid, code) \
 115         ((tid).ftid._code = code)
 116
 117 /*!
 118  * @typedef firehose_loss_payload_s
 119  *
 120  * @abstract
 121  * The payload for tracepoints in the loss namespace, generated by the firehose
 122  * itself when unreliable tracepoints are lost.
 123  */
 124 typedef struct firehose_loss_payload_s {
 125         uint64_t start_stamp; /* may (rarely!) disagree with the tracepoint stamp */
 126         uint64_t end_stamp;
 127 #define FIREHOSE_LOSS_COUNT_WIDTH 6 /* as many bits as can be spared */
 128 #define FIREHOSE_LOSS_COUNT_MAX ((1u << FIREHOSE_LOSS_COUNT_WIDTH) - 1)
 129         uint32_t count;
 130 } firehose_loss_payload_s, *firehose_loss_payload_t;
 131
 132 __BEGIN_DECLS
 133
 134 #if __has_feature(address_sanitizer)
 135 __attribute__((no_sanitize("address")))
 136 #endif
 137 __OSX_AVAILABLE(10.12) __IOS_AVAILABLE(10.0)
 138 __TVOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0)
 139 OS_ALWAYS_INLINE
 140 static inline bool
 141 firehose_precise_timestamps_enabled(void)
 142 {
 143 #if KERNEL
 144         return (atm_get_diagnostic_config() & 0x80) == 0;
 145 #else
 146         return (*((volatile uint32_t *)_COMM_PAGE_ATM_DIAGNOSTIC_CONFIG) & 0x80) == 0;
 147 #endif
 148 }
 149
 150 #if __has_feature(address_sanitizer)
 151 __attribute__((no_sanitize("address")))
 152 #endif
 153 __OSX_AVAILABLE(10.12) __IOS_AVAILABLE(10.0)
 154 __TVOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0)
 155 OS_ALWAYS_INLINE
 156 static inline uint64_t
 157 firehose_tracepoint_time(firehose_activity_flags_t flags)
 158 {
 159         if (firehose_precise_timestamps_enabled() ||
 160                         (flags & firehose_activity_flags_precise_timestamp)) {
 161                 return mach_continuous_time();
 162         } else {
 163                 return mach_continuous_approximate_time();
 164         }
 165 }
 166
 167 #ifdef KERNEL
 168 __OSX_AVAILABLE(10.12) __IOS_AVAILABLE(10.0)
 169 __TVOS_AVAILABLE(10.0) __WATCHOS_AVAILABLE(3.0)
 170 void
 171 firehose_trace_metadata(firehose_stream_t stream, firehose_tracepoint_id_u ftid,
 172                         uint64_t stamp, const void* pubdata, size_t publen);
 173 #endif
 174 __END_DECLS
 175
 176 OS_ASSUME_NONNULL_END
 177
 178 #endif // __FIREHOSE_FIREHOSE__