X-Git-Url: http://git.samba.org/samba.git/?p=sfrench%2Fcifs-2.6.git;a=blobdiff_plain;f=arch%2Fia64%2Fkernel%2Fmca.c;h=4b5daa3cc0feab6723764d67a7c221e74e5b3eb3;hp=1ead5ea6c5ce71afaf259eb6629abc8f65a0c11e;hb=1612b18ccb2318563ba51268289dc3271a6052f7;hpb=256a7e097ba3d1179867b4c9aba1b75fb32d44f2

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index 1ead5ea6c5ce..4b5daa3cc0fe 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -57,6 +57,9 @@
  *
  * 2006-09-15 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
  * 	      Add printing support for MCA/INIT.
+ *
+ * 2007-04-27 Russ Anderson <rja@sgi.com>
+ *	      Support multiple cpus going through OS_MCA in the same event.
  */
 #include <linux/types.h>
 #include <linux/init.h>
@@ -96,7 +99,6 @@
 #endif
 
 /* Used by mca_asm.S */
-u32				ia64_mca_serialize;
 DEFINE_PER_CPU(u64, ia64_mca_data); /* == __per_cpu_mca[smp_processor_id()] */
 DEFINE_PER_CPU(u64, ia64_mca_per_cpu_pte); /* PTE to map per-CPU area */
 DEFINE_PER_CPU(u64, ia64_mca_pal_pte);	    /* PTE to map PAL code */
@@ -963,11 +965,12 @@ ia64_mca_modify_original_stack(struct pt_regs *regs,
 		goto no_mod;
 	}
 
+	if (r13 != sos->prev_IA64_KR_CURRENT) {
+		msg = "inconsistent previous current and r13";
+		goto no_mod;
+	}
+
 	if (!mca_recover_range(ms->pmsa_iip)) {
-		if (r13 != sos->prev_IA64_KR_CURRENT) {
-			msg = "inconsistent previous current and r13";
-			goto no_mod;
-		}
 		if ((r12 - r13) >= KERNEL_STACK_SIZE) {
 			msg = "inconsistent r12 and r13";
 			goto no_mod;
@@ -1187,6 +1190,13 @@ all_in:
  *	further MCA logging is enabled by clearing logs.
  *	Monarch also has the duty of sending wakeup-IPIs to pull the
  *	slave processors out of rendezvous spinloop.
+ *
+ *	If multiple processors call into OS_MCA, the first will become
+ *	the monarch.  Subsequent cpus will be recorded in the mca_cpu
+ *	bitmask.  After the first monarch has processed its MCA, it
+ *	will wake up the next cpu in the mca_cpu bitmask and then go
+ *	into the rendezvous loop.  When all processors have serviced
+ *	their MCA, the last monarch frees up the rest of the processors.
  */
 void
 ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
@@ -1196,16 +1206,32 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 	struct task_struct *previous_current;
 	struct ia64_mca_notify_die nd =
 		{ .sos = sos, .monarch_cpu = &monarch_cpu };
+	static atomic_t mca_count;
+	static cpumask_t mca_cpu;
 
+	if (atomic_add_return(1, &mca_count) == 1) {
+		monarch_cpu = cpu;
+		sos->monarch = 1;
+	} else {
+		cpu_set(cpu, mca_cpu);
+		sos->monarch = 0;
+	}
 	mprintk(KERN_INFO "Entered OS MCA handler. PSP=%lx cpu=%d "
 		"monarch=%ld\n", sos->proc_state_param, cpu, sos->monarch);
 
 	previous_current = ia64_mca_modify_original_stack(regs, sw, sos, "MCA");
-	monarch_cpu = cpu;
+
 	if (notify_die(DIE_MCA_MONARCH_ENTER, "MCA", regs, (long)&nd, 0, 0)
 			== NOTIFY_STOP)
 		ia64_mca_spin(__FUNCTION__);
-	ia64_wait_for_slaves(cpu, "MCA");
+	if (sos->monarch) {
+		ia64_wait_for_slaves(cpu, "MCA");
+	} else {
+		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
+		while (cpu_isset(cpu, mca_cpu))
+			cpu_relax();	/* spin until monarch wakes us */
+		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+        }
 
 	/* Wakeup all the processors which are spinning in the rendezvous loop.
 	 * They will leave SAL, then spin in the OS with interrupts disabled
@@ -1244,6 +1270,26 @@ ia64_mca_handler(struct pt_regs *regs, struct switch_stack *sw,
 			== NOTIFY_STOP)
 		ia64_mca_spin(__FUNCTION__);
 
+
+	if (atomic_dec_return(&mca_count) > 0) {
+		int i;
+
+		/* wake up the next monarch cpu,
+		 * and put this cpu in the rendez loop.
+		 */
+		ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_CONCURRENT_MCA;
+		for_each_online_cpu(i) {
+			if (cpu_isset(i, mca_cpu)) {
+				monarch_cpu = i;
+				cpu_clear(i, mca_cpu);	/* wake next cpu */
+				while (monarch_cpu != -1)
+					cpu_relax();	/* spin until last cpu leaves */
+				ia64_mc_info.imi_rendez_checkin[cpu] = IA64_MCA_RENDEZ_CHECKIN_NOTDONE;
+				set_curr_task(cpu, previous_current);
+				return;
+			}
+		}
+	}
 	set_curr_task(cpu, previous_current);
 	monarch_cpu = -1;
 }