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/*
* arch/cris/kernel/debug.c
* Various debug routines:
* o Logging of interrupt enabling/disabling. /proc/debug_interrupt
* gives result and enables logging when read.
*
* Copyright (C) 2003 Axis Communications AB
*/
#include <linux/config.h>
#include <asm/system.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <asm/svinto.h>
#ifdef CONFIG_ETRAX_DEBUG_INTERRUPT
#define LOG_INT_SIZE 8192
#define DEBUG_INT_PROC_FILE "debug_interrupt"
#define LOG_INT_SHOW_MIN_USEC 45000
/* These are global and can be used to trig certain events. */
int log_int_pos = 0;
int log_int_size = LOG_INT_SIZE;
int log_int_trig0_pos = 0;
int log_int_trig1_pos = 0;
int log_int_enable = 0; /* Enabled every read of /proc/debug_interrupt */
struct log_int_struct
{
unsigned long pc;
unsigned long ev_timer_data;
};
static struct log_int_struct log_ints[LOG_INT_SIZE];
//static unsigned long prev_log_int_t = 0;
static unsigned long prev_logged_ccr = 0;
static unsigned long prev_ei_timer_data = 0;
static unsigned long prev_di_timer_data = 0;
#define CCR_EI_BIT 5
enum {
INT_OLD_MASK = 0x01, INT_OLD_BIT = 0,
INT_NEW_MASK = 0x02, INT_NEW_BIT = 1,
INT_EI_CHANGE_MASK = 0x04, INT_EI_CHANGE_BIT = 2,
INT_ACTION_RESTORE = 0x08, INT_ACTION_RESTORE_BIT = 3,
INT_ACTION_MISSED = 0x10, INT_ACTION_MISSED_BIT = 4,
INT_ACTION_LONG = 0x20, INT_ACTION_LONG_BIT = 5,
INT_OLD_EI = INT_OLD_MASK, INT_OLD_EI_BIT = INT_OLD_BIT,
INT_NEW_EI = INT_NEW_MASK, INT_NEW_EI_BIT = INT_NEW_BIT,
INT_EV_DI = INT_OLD_EI | INT_EI_CHANGE_MASK,
INT_EV_NOP_DI = 0,
INT_EV_EI = INT_NEW_EI | INT_EI_CHANGE_MASK,
INT_EV_NOP_EI = INT_OLD_EI | INT_NEW_EI,
INT_EV_RESTORE_DI= INT_EV_DI | INT_EI_CHANGE_MASK | INT_ACTION_RESTORE,
INT_EV_RESTORE_EI= INT_EV_EI | INT_EI_CHANGE_MASK | INT_ACTION_RESTORE,
INT_EV_RESTORE_NOP_DI = INT_EV_NOP_DI | INT_ACTION_RESTORE,
INT_EV_RESTORE_NOP_EI = INT_EV_NOP_EI | INT_ACTION_RESTORE,
};
void log_int(unsigned long pc, unsigned long curr_ccr, unsigned long next_ccr)
{
unsigned long t;
int ev;
static int no_change_cnt = 0;
/* Just disable interrupts without logging here,
* the caller will either do ei, di or restore
*/
__asm__ __volatile__ ("di" : : :"memory");
t = *R_TIMER_DATA;
if (curr_ccr & CCR_EI_MASK) {
prev_ei_timer_data = t;
ev = INT_OLD_EI;
} else {
prev_di_timer_data = t;
if ( (((prev_ei_timer_data >> 8) & 0x000000FF) -
((prev_di_timer_data >> 8) & 0x000000FF)) & ~0x03)
ev = INT_ACTION_LONG;
else
ev = 0;
}
if ((curr_ccr ^ prev_logged_ccr) & CCR_EI_MASK)
ev |= INT_ACTION_MISSED;
if (next_ccr & CCR_EI_MASK)
ev |= INT_NEW_EI;
if ((curr_ccr ^ next_ccr) & CCR_EI_MASK) {
ev |= INT_EI_CHANGE_MASK;
no_change_cnt = 0;
} else
no_change_cnt++;
prev_logged_ccr = next_ccr;
if (log_int_enable &&
((ev & (INT_EI_CHANGE_MASK | INT_ACTION_MISSED | INT_ACTION_LONG))
|| (no_change_cnt < 40)) &&
log_int_pos < LOG_INT_SIZE) {
int i;
i = log_int_pos;
log_int_pos++;
log_ints[i].pc = pc;
log_ints[i].ev_timer_data = (t & 0x00FFFFFF) |
((ev & 0xFF) << 24);
}
// __asm__ __volatile__ ("move %0,$ccr" : : "rm" (curr_ccr) : "memory");
}
void log_int_di(void)
{
unsigned long pc;
unsigned long flags;
__asm__ __volatile__ ("move $srp,%0" : "=rm" (pc) : : "memory");
__asm__ __volatile__ ("move $ccr,%0" : "=rm" (flags) : : "memory");
log_int(pc, flags, 0);
}
void log_int_ei(void)
{
unsigned long pc;
unsigned long flags;
__asm__ __volatile__ ("move $srp,%0" : "=rm" (pc) : : "memory");
__asm__ __volatile__ ("move $ccr,%0" : "=rm" (flags) : : "memory");
log_int(pc, flags, CCR_EI_MASK);
}
static int log_int_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
int i, len = 0;
off_t begin = 0;
int j, t0, t1, t, thigh, tlow, tdi0;
int di0, ei1;
len += sprintf(page + len, "trig0: %i trig1: %i\n", log_int_trig0_pos, log_int_trig1_pos);
for (i = 0; i < log_int_pos-1; i++) {
if (((log_ints[i].ev_timer_data >> 24) & INT_NEW_EI)) {
di0 = i;
while (di0 < log_int_pos-1 && (((log_ints[di0].ev_timer_data >> 24) & INT_NEW_EI)))
di0++;
ei1 = di0+1;
while (ei1 < log_int_pos-1 && (((log_ints[ei1].ev_timer_data >> 24) & INT_NEW_EI) == 0))
ei1++;
thigh = timer_data_to_ns(log_ints[ei1].ev_timer_data);
tlow = timer_data_to_ns(log_ints[di0].ev_timer_data);
tdi0 = timer_data_to_ns(log_ints[di0].ev_timer_data);
t = thigh-tlow;
j = di0-1;
if ((t > LOG_INT_SHOW_MIN_USEC) || (log_int_trig0_pos-30 < j && j < log_int_trig1_pos+30)) {
for (; j <= ei1; j++) {
t0 = ((log_ints[j+1].ev_timer_data & 0xFF) -
(log_ints[j].ev_timer_data & 0xFF));
t1 = (((log_ints[j+1].ev_timer_data >> 8) & 0xFF) -
((log_ints[j].ev_timer_data >> 8) & 0xFF));
if (t1 == 0 || t1 == 1) {
if (t0 < 0)
t0 += 256;
} else {
if (t1 < 0)
t1 += 256;
}
thigh = timer_data_to_ns(log_ints[j+1].ev_timer_data);
tlow = timer_data_to_ns(log_ints[j].ev_timer_data);
t = thigh-tlow;
len += sprintf(page + len, "%4i PC %08lX-%08lX %08lX-%08lX %s high %i in %-6i ns %-7i to %-7i = %-5i ns, from first di %i ns %s\n",
j, log_ints[j].pc, log_ints[j+1].pc,
log_ints[j].ev_timer_data, log_ints[j+1].ev_timer_data,
((log_ints[j].ev_timer_data >> 24) & INT_NEW_EI)!= 0?"ei":"di", t1, t,
tlow, thigh, thigh-tlow, thigh-tdi0,
j==log_int_trig0_pos?"TRIG0":(j==log_int_trig1_pos?"TRIG1":""));
if (len+begin > off+count)
goto done;
if (len+begin < off) {
begin += len;
len = 0;
}
}
len += sprintf(page + len,"\n");
i = ei1-2;
}
}
}
log_int_enable = 1;
log_int_pos = 0;
log_int_trig0_pos = 0;
log_int_trig1_pos = 0;
*eof = 1;
done:
if (off >= len+begin)
return 0;
*start = page + (off-begin);
return ((count < begin+len-off) ? count : begin+len-off);
}
static int __init
log_int_init(void)
{
create_proc_read_entry (DEBUG_INT_PROC_FILE, 0, 0, log_int_read_proc, NULL);
printk(KERN_INFO "/proc/" DEBUG_INT_PROC_FILE " size %i.\r\n",
LOG_INT_SIZE);
return 0;
}
module_init(log_int_init);
#endif /* CONFIG_ETRAX_DEBUG_INTERRUPT */
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