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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
|
/***********************license start***************
* Copyright (c) 2003-2008 Cavium Networks (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Cavium Networks nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS
* OR WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH
* RESPECT TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY
* REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT
* DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES
* OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR
* PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET
* POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT
* OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
*
*
* For any questions regarding licensing please contact marketing@caviumnetworks.com
*
***********************license end**************************************/
/**
* @file
*
* cvmx-log supplies a fast log buffer implementation. Each core writes
* log data to a differnet buffer to avoid synchronization overhead. Function
* call logging can be turned on with the GCC option "-pg".
*
* <hr>$Revision: 41586 $<hr>
*/
#include "cvmx.h"
#include "cvmx-log.h"
#define CVMX_LOG_BUFFER_SIZE (1<<15)
#define CVMX_LOG_NUM_BUFFERS 4
/**
* The possible types of log data that can be stored in the
* buffer.
*/
typedef enum
{
CVMX_LOG_TYPE_PC = 0, /**< Log of the program counter location. used for code profiling / tracing */
CVMX_LOG_TYPE_PRINTF, /**< Constant printf format string with two 64bit arguments */
CVMX_LOG_TYPE_DATA, /**< Arbitrary array of dwords. Max size is 31 dwords */
CVMX_LOG_TYPE_STRUCTURE,/**< Log a structured data element. Max size is 30 dwords */
CVMX_LOG_TYPE_PERF, /**< Mips performance counters control registers followed by the data */
} cvmx_log_type_t;
/**
* Header definition for each log entry.
*/
typedef union
{
uint64_t u64;
struct
{
cvmx_log_type_t type : 3; /* Data in the log entry */
uint64_t size : 8; /* Data size in 64bit words */
uint64_t cycle :53; /* Low bits of the cycle counter as a timestamp */
} s;
} cvmx_log_header_t;
/**
* Circular log buffer. Each processor gets a private one to
* write to. Log entries are added at the current write
* location, then the write location is incremented. The
* buffer may wrap in the middle of a log entry.
*/
static uint64_t cvmx_log_buffers[CVMX_LOG_NUM_BUFFERS][CVMX_LOG_BUFFER_SIZE];
/**
* Current locations in the log.
*/
uint64_t *cvmx_log_buffer_write_ptr = NULL; /* The next write will occur here */
uint64_t *cvmx_log_buffer_end_ptr = NULL; /* Write must move to the next buffer when it equals this */
uint64_t *cvmx_log_buffer_head_ptr = NULL; /* Pointer to begin extracting log data from */
static uint64_t *cvmx_log_buffer_read_ptr = NULL; /* Location cvmx_display is reading from */
static uint64_t *cvmx_log_buffer_read_end_ptr = NULL; /* Location where read will need the next buffer */
uint64_t cvmx_log_mcd0_on_full = 0; /* If this is set, cvm-log will assert MCD0 when the log
is full. This is set by the remote logging utility through
the debugger interface. */
/**
* @INTERNAL
* Initialize the log for writing
*/
static void __cvmx_log_initialize(void) CVMX_LOG_DISABLE_PC_LOGGING;
static void __cvmx_log_initialize(void)
{
int buf_num;
/* Link the buffers together using the last element in each buffer */
for (buf_num=0; buf_num<CVMX_LOG_NUM_BUFFERS-1; buf_num++)
cvmx_log_buffers[buf_num][CVMX_LOG_BUFFER_SIZE-1] = CAST64(cvmx_log_buffers[buf_num+1]);
cvmx_log_buffers[CVMX_LOG_NUM_BUFFERS-1][CVMX_LOG_BUFFER_SIZE-1] = CAST64(NULL);
cvmx_log_buffer_head_ptr = &cvmx_log_buffers[0][0];
cvmx_log_buffer_write_ptr = &cvmx_log_buffers[0][0];
cvmx_log_buffer_end_ptr = cvmx_log_buffer_write_ptr + CVMX_LOG_BUFFER_SIZE-1;
}
/**
* @INTERNAL
* Called when the log is full of data. This function must
* make room for more log data before returning.
*/
static void __cvmx_log_full_process(void) CVMX_LOG_DISABLE_PC_LOGGING;
static void __cvmx_log_full_process(void)
{
if (cvmx_log_mcd0_on_full)
{
register uint64_t tmp;
/* Pulse MCD0 signal so a remote utility can extract the data */
asm volatile (
"dmfc0 %0, $22\n"
"ori %0, %0, 0x1110\n"
"dmtc0 %0, $22\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
"nop\n"
: "=r" (tmp));
}
/* The write ptr may have been modifed by the debugger, check it again */
if (!(volatile uint64_t)CAST64(cvmx_log_buffer_write_ptr))
{
#ifndef __KERNEL__
/* Disabled for the Linux kernel since printk is also profiled */
cvmx_dprintf("Log is full, reusing first buffer\n");
#endif
*cvmx_log_buffer_end_ptr = CAST64(cvmx_log_buffer_head_ptr);
cvmx_log_buffer_write_ptr = cvmx_log_buffer_head_ptr;
cvmx_log_buffer_end_ptr = cvmx_log_buffer_write_ptr + CVMX_LOG_BUFFER_SIZE-1;
cvmx_log_buffer_head_ptr = CASTPTR(uint64_t, *cvmx_log_buffer_end_ptr);
*cvmx_log_buffer_end_ptr = CAST64(NULL);
}
}
/**
* @INTERNAL
* Simple inline function to build a log header
*
* @param type Type of header to build
* @param size Amount of data that follows the header in dwords
* @return The header
*/
static inline uint64_t __cvmx_log_build_header(cvmx_log_type_t type, uint64_t size) CVMX_LOG_DISABLE_PC_LOGGING;
static inline uint64_t __cvmx_log_build_header(cvmx_log_type_t type, uint64_t size)
{
cvmx_log_header_t header;
header.u64 = 0;
header.s.type = type;
header.s.size = size;
header.s.cycle = cvmx_get_cycle();
return header.u64;
}
/**
* @INTERNAL
* Function to write and increment the position. It rotates
* to the next log buffer as necessary.
*
* @param data Data to write to the log
*/
static inline void __cvmx_log_write(uint64_t data) CVMX_LOG_DISABLE_PC_LOGGING;
static inline void __cvmx_log_write(uint64_t data)
{
/* Check and see if we need to rotate the log */
if (cvmx_likely(cvmx_log_buffer_write_ptr != cvmx_log_buffer_end_ptr))
{
/* No rotate is necessary, just write the data */
*cvmx_log_buffer_write_ptr++ = data;
}
else
{
/* Initialize the log if necessary */
if (cvmx_unlikely(cvmx_log_buffer_head_ptr == NULL))
__cvmx_log_initialize();
else
{
cvmx_log_buffer_write_ptr = CASTPTR(uint64_t, *cvmx_log_buffer_end_ptr);
if (cvmx_likely(cvmx_log_buffer_write_ptr))
{
/* Rotate the log. Might be a good time to send the old buffer
somewhere */
cvmx_log_buffer_end_ptr = cvmx_log_buffer_write_ptr + CVMX_LOG_BUFFER_SIZE-1;
}
else
__cvmx_log_full_process(); /* After this function returns, the log must be ready for updates */
}
*cvmx_log_buffer_write_ptr++ = data;
}
}
/**
* Log a program counter address to the log. This is caused by
* the assembly code function mcount when writing the PC value
* is more complicated that the simple case support by it.
*
* @param pc Program counter address to log
*/
void cvmx_log_pc(uint64_t pc) CVMX_LOG_DISABLE_PC_LOGGING;
void cvmx_log_pc(uint64_t pc)
{
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PC, 1));
__cvmx_log_write(pc);
}
/**
* Log a constant printf style format string with 0 to 4
* arguments. The string must persist until the log is read,
* but the parameters are copied into the log.
*
* @param format Constant printf style format string.
*/
void cvmx_log_printf0(const char *format)
{
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PRINTF, 1));
__cvmx_log_write(CAST64(format));
}
/**
* Log a constant printf style format string with 0 to 4
* arguments. The string must persist until the log is read,
* but the parameters are copied into the log.
*
* @param format Constant printf style format string.
* @param number1 64bit argument to the printf format string
*/
void cvmx_log_printf1(const char *format, uint64_t number1)
{
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PRINTF, 2));
__cvmx_log_write(CAST64(format));
__cvmx_log_write(number1);
}
/**
* Log a constant printf style format string with 0 to 4
* arguments. The string must persist until the log is read,
* but the parameters are copied into the log.
*
* @param format Constant printf style format string.
* @param number1 64bit argument to the printf format string
* @param number2 64bit argument to the printf format string
*/
void cvmx_log_printf2(const char *format, uint64_t number1, uint64_t number2)
{
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PRINTF, 3));
__cvmx_log_write(CAST64(format));
__cvmx_log_write(number1);
__cvmx_log_write(number2);
}
/**
* Log a constant printf style format string with 0 to 4
* arguments. The string must persist until the log is read,
* but the parameters are copied into the log.
*
* @param format Constant printf style format string.
* @param number1 64bit argument to the printf format string
* @param number2 64bit argument to the printf format string
* @param number3 64bit argument to the printf format string
*/
void cvmx_log_printf3(const char *format, uint64_t number1, uint64_t number2, uint64_t number3)
{
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PRINTF, 4));
__cvmx_log_write(CAST64(format));
__cvmx_log_write(number1);
__cvmx_log_write(number2);
__cvmx_log_write(number3);
}
/**
* Log a constant printf style format string with 0 to 4
* arguments. The string must persist until the log is read,
* but the parameters are copied into the log.
*
* @param format Constant printf style format string.
* @param number1 64bit argument to the printf format string
* @param number2 64bit argument to the printf format string
* @param number3 64bit argument to the printf format string
* @param number4 64bit argument to the printf format string
*/
void cvmx_log_printf4(const char *format, uint64_t number1, uint64_t number2, uint64_t number3, uint64_t number4)
{
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PRINTF, 5));
__cvmx_log_write(CAST64(format));
__cvmx_log_write(number1);
__cvmx_log_write(number2);
__cvmx_log_write(number3);
__cvmx_log_write(number4);
}
/**
* Log an arbitrary block of 64bit words. At most 255 64bit
* words can be logged. The words are copied into the log.
*
* @param size_in_dwords
* Number of 64bit dwords to copy into the log.
* @param data Array of 64bit dwords to copy
*/
void cvmx_log_data(uint64_t size_in_dwords, const uint64_t *data)
{
if (size_in_dwords > 255)
size_in_dwords = 255;
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_DATA, size_in_dwords));
while (size_in_dwords--)
__cvmx_log_write(*data++);
}
/**
* Log a structured data object. Post processing will use the
* debugging information in the ELF file to determine how to
* display the structure. Max of 2032 bytes.
*
* Example:
* cvmx_log_structure("cvmx_wqe_t", work, sizeof(*work));
*
* @param type C typedef expressed as a string. This will be used to
* lookup the structure in the debugging infirmation.
* @param data Data to be written to the log.
* @param size_in_bytes
* Size if the data in bytes. Normally you'll use the
* sizeof() operator here.
*/
void cvmx_log_structure(const char *type, void *data, int size_in_bytes)
{
uint64_t size_in_dwords = (size_in_bytes + 7) >> 3;
uint64_t *ptr = (uint64_t*)data;
if (size_in_dwords > 254)
size_in_dwords = 254;
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_STRUCTURE, size_in_dwords + 1));
__cvmx_log_write(CAST64(type));
while (size_in_dwords--)
__cvmx_log_write(*ptr++);
}
/**
* Setup the mips performance counters
*
* @param counter1 Event type for counter 1
* @param counter2 Event type for counter 2
*/
void cvmx_log_perf_setup(cvmx_log_perf_event_t counter1, cvmx_log_perf_event_t counter2)
{
cvmx_log_perf_control_t control;
control.u32 = 0;
control.s.event = counter1;
control.s.U = 1;
control.s.S = 1;
control.s.K = 1;
control.s.EX = 1;
asm ("mtc0 %0, $25, 0\n" : : "r"(control.u32));
control.s.event = counter2;
asm ("mtc0 %0, $25, 2\n" : : "r"(control.u32));
}
/**
* Log the performance counters
*/
void cvmx_log_perf(void)
{
uint64_t control1;
uint64_t control2;
uint64_t data1;
uint64_t data2;
asm ("dmfc0 %0, $25, 1\n" : "=r"(data1));
asm ("dmfc0 %0, $25, 3\n" : "=r"(data2));
asm ("mfc0 %0, $25, 0\n" : "=r"(control1));
asm ("mfc0 %0, $25, 2\n" : "=r"(control2));
__cvmx_log_write(__cvmx_log_build_header(CVMX_LOG_TYPE_PERF, 3));
__cvmx_log_write(((control1 & 0xffffffff) << 32) | (control2 & 0xffffffff));
__cvmx_log_write(data1);
__cvmx_log_write(data2);
}
/**
* @INTERNAL
* Read a dword from the log
*
* @return the dword
*/
static uint64_t __cvmx_log_read(void) CVMX_LOG_DISABLE_PC_LOGGING;
static uint64_t __cvmx_log_read(void)
{
uint64_t data;
/* Check and see if we need to rotate the log */
if (cvmx_likely(cvmx_log_buffer_read_ptr != cvmx_log_buffer_read_end_ptr))
{
/* No rotate is necessary, just read the data */
data = *cvmx_log_buffer_read_ptr++;
}
else
{
cvmx_log_buffer_read_ptr = CASTPTR(uint64_t, *cvmx_log_buffer_read_end_ptr);
if (cvmx_likely(cvmx_log_buffer_read_ptr))
{
/* Rotate to the next log buffer */
cvmx_log_buffer_read_end_ptr = cvmx_log_buffer_read_ptr + CVMX_LOG_BUFFER_SIZE-1;
data = *cvmx_log_buffer_read_ptr++;
}
else
{
/* No more log buffers, return 0 */
cvmx_log_buffer_read_end_ptr = NULL;
data = 0;
}
}
return data;
}
/**
* Display the current log in a human readable format.
*/
void cvmx_log_display(void)
{
unsigned int i;
cvmx_log_header_t header;
cvmx_log_buffer_read_ptr = cvmx_log_buffer_head_ptr;
cvmx_log_buffer_read_end_ptr = cvmx_log_buffer_read_ptr + CVMX_LOG_BUFFER_SIZE-1;
while (cvmx_log_buffer_read_ptr && (cvmx_log_buffer_read_ptr != cvmx_log_buffer_write_ptr))
{
header.u64 = __cvmx_log_read();
if (header.s.cycle == 0)
continue;
printf("%llu: ", (unsigned long long)header.s.cycle);
switch (header.s.type)
{
case CVMX_LOG_TYPE_PC:
if (header.s.size == 1)
printf("pc 0x%016llx\n", (unsigned long long)__cvmx_log_read());
else
printf("Illegal size (%d) for log entry: pc\n", header.s.size);
break;
case CVMX_LOG_TYPE_PRINTF:
switch (header.s.size)
{
case 1:
printf(CASTPTR(const char, __cvmx_log_read()));
break;
case 2:
printf(CASTPTR(const char, __cvmx_log_read()), __cvmx_log_read());
break;
case 3:
printf(CASTPTR(const char, __cvmx_log_read()), __cvmx_log_read(), __cvmx_log_read());
break;
case 4:
printf(CASTPTR(const char, __cvmx_log_read()), __cvmx_log_read(), __cvmx_log_read(), __cvmx_log_read());
break;
case 5:
printf(CASTPTR(const char, __cvmx_log_read()), __cvmx_log_read(), __cvmx_log_read(), __cvmx_log_read(), __cvmx_log_read());
break;
default:
printf("Illegal size (%d) for log entry: printf\n", header.s.size);
break;
}
printf("\n");
break;
case CVMX_LOG_TYPE_DATA:
printf("data");
for (i=0; i<header.s.size; i++)
printf(" 0x%016llx", (unsigned long long)__cvmx_log_read());
printf("\n");
break;
case CVMX_LOG_TYPE_STRUCTURE:
printf("struct %s", CASTPTR(const char, __cvmx_log_read()));
for (i=1; i<header.s.size; i++)
printf(" 0x%016llx", (unsigned long long)__cvmx_log_read());
printf("\n");
break;
case CVMX_LOG_TYPE_PERF:
if (header.s.size == 3)
{
unsigned long long control = __cvmx_log_read();
unsigned long long data1 = __cvmx_log_read();
unsigned long long data2 = __cvmx_log_read();
printf("perf control=0x%016llx data1=0x%016llx data2=0x%016llx\n", control, data1, data2);
}
else
printf("Illegal size (%d) for log entry: perf\n", header.s.size);
break;
default:
break;
}
}
}
|