1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/import/chips/p9/procedures/ppe/pk/trace/pk_trace_core.c $ */
/* */
/* OpenPOWER sbe Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2015,2017 */
/* [+] International Business Machines Corp. */
/* */
/* */
/* Licensed under the Apache License, Version 2.0 (the "License"); */
/* you may not use this file except in compliance with the License. */
/* You may obtain a copy of the License at */
/* */
/* http://www.apache.org/licenses/LICENSE-2.0 */
/* */
/* Unless required by applicable law or agreed to in writing, software */
/* distributed under the License is distributed on an "AS IS" BASIS, */
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */
/* implied. See the License for the specific language governing */
/* permissions and limitations under the License. */
/* */
/* IBM_PROLOG_END_TAG */
/// \file pk_trace_core.c
/// \brief PK Trace core data and code.
///
/// This file includes the minimal code/data required to do minimal tracing.
/// This includes the periodic timer initialization and the pk_trace_tiny
/// function. The pk_trace_tiny function is called by the PK_TRACE() macro
/// when there is one or less parameters (not including the format string)
/// and the parameter size is 16 bits or smaller.
///
#include "pk.h"
#include "pk_trace.h"
#if (PK_TRACE_SUPPORT)
#if (PK_TIMER_SUPPORT)
void pk_trace_timer_callback(void* arg);
extern PkTimer g_pk_trace_timer __attribute__((section (".sdata")));
//Static initialization of the trace timer
PkTimer g_pk_trace_timer __attribute__ ((section (".sdata"))) =
{
.deque = PK_DEQUE_ELEMENT_INIT(),
.timeout = 0,
.callback = pk_trace_timer_callback,
.arg = 0,
};
#endif
//Static initialization of the pk trace buffer
PkTraceBuffer g_pk_trace_buf __attribute__ ((section (".sdata"))) =
{
.version = PK_TRACE_VERSION,
.image_str = PPE_IMG_STRING,
.hash_prefix = PK_TRACE_HASH_PREFIX,
.partial_trace_hash =
trace_ppe_hash("PARTIAL TRACE ENTRY. HASH_ID = %d", PK_TRACE_HASH_PREFIX),
.size = PK_TRACE_SZ,
.max_time_change = PK_TRACE_MTBT,
.hz = 25000000, //Actula value set by pk_trace_set_freq()
.time_adj64 = 0,
.state.word64 = 0,
.cb = {0}
};
//Needed for buffer extraction in simics for now
PkTraceBuffer* g_pk_trace_buf_ptr = &g_pk_trace_buf;
#ifdef PK_TRACE_BUFFER_WRAP_MARKER
uint32_t G_wrap_mask = 0;
#endif
// Creates an 8 byte entry in the trace buffer that includes a timestamp,
// a format string hash value and a 16 bit parameter.
//
// i_parm has the hash value combined with the 16 bit parameter
void pk_trace_tiny(uint32_t i_parm)
{
PkTraceTiny footer;
PkTraceState state;
uint64_t* ptr64;
uint64_t tb64;
PkMachineContext ctx;
//fill in the footer data
footer.parms.word32 = i_parm;
tb64 = pk_timebase_get();
state.tbu32 = tb64 >> 32;
footer.time_format.word32 = tb64 & 0x00000000ffffffffull;
footer.time_format.format = PK_TRACE_FORMAT_TINY;
//The following operations must be done atomically
pk_critical_section_enter(&ctx);
//load the current byte count and calculate the address for this
//entry in the cb
ptr64 = (uint64_t*)&g_pk_trace_buf.cb[g_pk_trace_buf.state.offset & PK_TRACE_CB_MASK];
//calculate the offset for the next entry in the cb
state.offset = g_pk_trace_buf.state.offset + sizeof(PkTraceTiny);
#ifdef PK_TRACE_BUFFER_WRAP_MARKER
//insert marker to indicate when circular buffer wraps
if ((state.offset & PK_TRACE_SZ) ^ G_wrap_mask)
{
G_wrap_mask = state.offset & PK_TRACE_SZ;
asm volatile ("tw 0, 31, 31");
}
#endif
//update the cb state (tbu and offset)
g_pk_trace_buf.state.word64 = state.word64;
//write the data to the circular buffer including the
//timesamp, string hash, and 16bit parameter
*ptr64 = footer.word64;
//exit the critical section
pk_critical_section_exit(&ctx);
}
#if (PK_TIMER_SUPPORT)
// This function is called periodically in order to ensure that the max ticks
// between trace entries is no more than what will fit inside a 32bit value.
#ifndef PK_TRACE_TIMER_OUTPUT
#define PK_TRACE_TIMER_OUTPUT 1
#endif
void pk_trace_timer_callback(void* arg)
{
#if PK_TRACE_TIMER_OUTPUT
// guarantee at least one trace before the lower 32bit timebase flips
PK_TRACE("PERIODIC TIMESTAMPING TRACE");
#endif
// restart the timer
pk_timer_schedule(&g_pk_trace_timer,
PK_TRACE_TIMER_PERIOD);
}
#endif // PK_TIMER_SUPPORT (timed callback support)
// Use this function to synchronize the timebase between multiple PPEs.
// PPE A can send PPE B it's current timebase and then PPE B can set that
// as the current timebase for tracing purposes. It can also be used
// to set the current time to 0. This function changes the timebase for
// all entries that are currently in the trace buffer. Setting the current
// timebase to 0 will cause previous traces to have very large timestamps.
void pk_trace_set_timebase(PkTimebase timebase)
{
g_pk_trace_buf.time_adj64 = timebase - pk_timebase_get();
}
void pk_trace_set_freq(uint32_t i_frequency)
{
g_pk_trace_buf.hz = i_frequency;
}
#endif // PK_TRACE_SUPPORT
|
