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-rw-r--r--arch/powerpc/platforms/iseries/smp.c120
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diff --git a/arch/powerpc/platforms/iseries/smp.c b/arch/powerpc/platforms/iseries/smp.c
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+++ b/arch/powerpc/platforms/iseries/smp.c
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+/*
+ * 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/hv_call.h>
+#include <asm/time.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_probe(void)
+{
+ return cpus_weight(cpu_possible_map);
+}
+
+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;
+}