patch-2.4.22 linux-2.4.22/arch/cris/kernel/debug.c

• Lines: 214
• Date: 2003-08-25 04:44:39.000000000 -0700
• Orig file: linux-2.4.21/arch/cris/kernel/debug.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/cris/kernel/debug.c linux-2.4.22/arch/cris/kernel/debug.c
@@ -0,0 +1,213 @@
+/*
+ * arch/cris/kernel/debug.c
+ * Various debug routines:
+ * o Logging of interrupt enabling/disabling. /proc/debug_interrupt
+ *   gives result and toggles if it is enabled or not.
+ *
+ * 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; /* toggled 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 */