1 files changed, 121 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/iseries/smp.c b/arch/powerpc/platforms/iseries/smp.c
new file mode 100644
index 000000000000..f720916682f6
--- /dev/null
+++ b/arch/powerpc/platforms/iseries/smp.c
@@ -0,0 +1,121 @@
+/*
+ * 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/HvCall.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_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;
+}