From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 arch/ppc64/kernel/iSeries_smp.c | 151 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 arch/ppc64/kernel/iSeries_smp.c

(limited to 'arch/ppc64/kernel/iSeries_smp.c')

diff --git a/arch/ppc64/kernel/iSeries_smp.c b/arch/ppc64/kernel/iSeries_smp.c
new file mode 100644
index 000000000000..ba1f084d5462
--- /dev/null
+++ b/arch/ppc64/kernel/iSeries_smp.c
@@ -0,0 +1,151 @@
+/*
+ * SMP support for iSeries machines.
+ *
+ * Dave Engebretsen, Peter Bergner, and
+ * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com
+ *
+ * Plus various changes from other IBM teams...
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#undef DEBUG
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/cache.h>
+#include <linux/err.h>
+#include <linux/sysdev.h>
+#include <linux/cpu.h>
+
+#include <asm/ptrace.h>
+#include <asm/atomic.h>
+#include <asm/irq.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/paca.h>
+#include <asm/iSeries/LparData.h>
+#include <asm/iSeries/HvCall.h>
+#include <asm/iSeries/HvCallCfg.h>
+#include <asm/time.h>
+#include <asm/ppcdebug.h>
+#include <asm/machdep.h>
+#include <asm/cputable.h>
+#include <asm/system.h>
+
+static unsigned long iSeries_smp_message[NR_CPUS];
+
+void iSeries_smp_message_recv( struct pt_regs * regs )
+{
+	int cpu = smp_processor_id();
+	int msg;
+
+	if ( num_online_cpus() < 2 )
+		return;
+
+	for ( msg = 0; msg < 4; ++msg )
+		if ( test_and_clear_bit( msg, &iSeries_smp_message[cpu] ) )
+			smp_message_recv( msg, regs );
+}
+
+static inline void smp_iSeries_do_message(int cpu, int msg)
+{
+	set_bit(msg, &iSeries_smp_message[cpu]);
+	HvCall_sendIPI(&(paca[cpu]));
+}
+
+static void smp_iSeries_message_pass(int target, int msg)
+{
+	int i;
+
+	if (target < NR_CPUS)
+		smp_iSeries_do_message(target, msg);
+	else {
+		for_each_online_cpu(i) {
+			if (target == MSG_ALL_BUT_SELF
+			    && i == smp_processor_id())
+				continue;
+			smp_iSeries_do_message(i, msg);
+		}
+	}
+}
+
+static int smp_iSeries_numProcs(void)
+{
+	unsigned np, i;
+
+	np = 0;
+        for (i=0; i < NR_CPUS; ++i) {
+                if (paca[i].lppaca.dyn_proc_status < 2) {
+			cpu_set(i, cpu_possible_map);
+			cpu_set(i, cpu_present_map);
+			cpu_set(i, cpu_sibling_map[i]);
+                        ++np;
+                }
+        }
+	return np;
+}
+
+static int smp_iSeries_probe(void)
+{
+	unsigned i;
+	unsigned np = 0;
+
+	for (i=0; i < NR_CPUS; ++i) {
+		if (paca[i].lppaca.dyn_proc_status < 2) {
+			/*paca[i].active = 1;*/
+			++np;
+		}
+	}
+
+	return np;
+}
+
+static void smp_iSeries_kick_cpu(int nr)
+{
+	BUG_ON(nr < 0 || nr >= NR_CPUS);
+
+	/* Verify that our partition has a processor nr */
+	if (paca[nr].lppaca.dyn_proc_status >= 2)
+		return;
+
+	/* The processor is currently spinning, waiting
+	 * for the cpu_start field to become non-zero
+	 * After we set cpu_start, the processor will
+	 * continue on to secondary_start in iSeries_head.S
+	 */
+	paca[nr].cpu_start = 1;
+}
+
+static void __devinit smp_iSeries_setup_cpu(int nr)
+{
+}
+
+static struct smp_ops_t iSeries_smp_ops = {
+	.message_pass = smp_iSeries_message_pass,
+	.probe        = smp_iSeries_probe,
+	.kick_cpu     = smp_iSeries_kick_cpu,
+	.setup_cpu    = smp_iSeries_setup_cpu,
+};
+
+/* This is called very early. */
+void __init smp_init_iSeries(void)
+{
+	smp_ops = &iSeries_smp_ops;
+	systemcfg->processorCount	= smp_iSeries_numProcs();
+}
+
-- 
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