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From: John Birrell <jb@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
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Subject: PERFORCE change 102970 for review
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http://perforce.freebsd.org/chv.cgi?CH=102970

Change 102970 by jb@jb_freebsd2 on 2006/08/01 20:42:20

	When heading for a panic due to an unacked IPI, we really only need the
	first CPU which decides to panic to print put the trace buffer.
	
	Also report the pad fields from the per-cpu structure which we'll try
	to poke stuff in when we're at tl2 to see what is going on.

Affected files ...

.. //depot/projects/kmacy_sun4v_stable/src/sys/sun4v/sun4v/pmap.c#11 edit

Differences ...

==== //depot/projects/kmacy_sun4v_stable/src/sys/sun4v/sun4v/pmap.c#11 (text+ko) ====

@@ -1218,6 +1218,10 @@
 	m->md.pv_list_count++;
 }
 
+#ifdef TRAP_TRACING
+static int trap_trace_report_done;
+#endif
+
 #ifdef SMP
 static cpumask_t
 pmap_ipi(pmap_t pmap, char *func, uint64_t arg1, uint64_t arg2)
@@ -1288,9 +1292,17 @@
 			       curactive & ~ackmask);
 
 #ifdef TRAP_TRACING
-			for (j = 0; j < MAXCPU; j++)
-				if (((1 << j) & curactive & ~ackmask) != 0)
-					trap_trace_report(j);
+			if (!trap_trace_report_done) {
+				trap_trace_report_done = 1;
+				for (j = 0; j < MAXCPU; j++)
+					if (((1 << j) & curactive & ~ackmask) != 0) {
+						struct pcpu *pc = pcpu_find(j);
+						printf("pcpu pad 0x%jx 0x%jx 0x%jx 0x%jx 0x%jx 0x%jx 0x%jx\n",
+						    pc->pad[0], pc->pad[1], pc->pad[2], pc->pad[3],
+						    pc->pad[4], pc->pad[5], pc->pad[6]);
+						trap_trace_report(j);
+					}
+			}
 #endif
 
 			hv_cpu_state((uint64_t)ffs64(curactive & ~ackmask), &cpu_state);