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/***********************license start***************
* Copyright (c) 2003-2010 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.
* This Software, including technical data, may be subject to U.S. export control
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************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: 49448 $<hr>
*/
#include "cvmx.h"
#include "cvmx-core.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_core_perf_t counter1, cvmx_core_perf_t counter2)
{
cvmx_core_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;
}
}
}