Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 162 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/ps3/smp.c b/arch/powerpc/platforms/ps3/smp.c
new file mode 100644
index 0000000..a0927a3
--- /dev/null
+++ b/arch/powerpc/platforms/ps3/smp.c
@@ -0,0 +1,162 @@
+/*
+ *  PS3 SMP routines.
+ *
+ *  Copyright (C) 2006 Sony Computer Entertainment Inc.
+ *  Copyright 2006 Sony Corp.
+ *
+ *  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; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/smp.h>
+
+#include <asm/machdep.h>
+#include <asm/udbg.h>
+
+#include "platform.h"
+
+#if defined(DEBUG)
+#define DBG udbg_printf
+#else
+#define DBG pr_debug
+#endif
+
+static irqreturn_t ipi_function_handler(int irq, void *msg)
+{
+	smp_message_recv((int)(long)msg);
+	return IRQ_HANDLED;
+}
+
+/**
+  * ps3_ipi_virqs - a per cpu array of virqs for ipi use
+  */
+
+#define MSG_COUNT 4
+static DEFINE_PER_CPU(unsigned int, ps3_ipi_virqs[MSG_COUNT]);
+
+static const char *names[MSG_COUNT] = {
+	"ipi call",
+	"ipi reschedule",
+	"ipi migrate",
+	"ipi debug brk"
+};
+
+static void do_message_pass(int target, int msg)
+{
+	int result;
+	unsigned int virq;
+
+	if (msg >= MSG_COUNT) {
+		DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
+		return;
+	}
+
+	virq = per_cpu(ps3_ipi_virqs, target)[msg];
+	result = ps3_send_event_locally(virq);
+
+	if (result)
+		DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
+			" (%d)\n", __func__, __LINE__, target, msg, result);
+}
+
+static void ps3_smp_message_pass(int target, int msg)
+{
+	int cpu;
+
+	if (target < NR_CPUS)
+		do_message_pass(target, msg);
+	else if (target == MSG_ALL_BUT_SELF) {
+		for_each_online_cpu(cpu)
+			if (cpu != smp_processor_id())
+				do_message_pass(cpu, msg);
+	} else {
+		for_each_online_cpu(cpu)
+			do_message_pass(cpu, msg);
+	}
+}
+
+static int ps3_smp_probe(void)
+{
+	return 2;
+}
+
+static void __init ps3_smp_setup_cpu(int cpu)
+{
+	int result;
+	unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
+	int i;
+
+	DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
+
+	/*
+	 * Check assumptions on ps3_ipi_virqs[] indexing. If this
+	 * check fails, then a different mapping of PPC_MSG_
+	 * to index needs to be setup.
+	 */
+
+	BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION    != 0);
+	BUILD_BUG_ON(PPC_MSG_RESCHEDULE       != 1);
+	BUILD_BUG_ON(PPC_MSG_CALL_FUNC_SINGLE != 2);
+	BUILD_BUG_ON(PPC_MSG_DEBUGGER_BREAK   != 3);
+
+	for (i = 0; i < MSG_COUNT; i++) {
+		result = ps3_event_receive_port_setup(cpu, &virqs[i]);
+
+		if (result)
+			continue;
+
+		DBG("%s:%d: (%d, %d) => virq %u\n",
+			__func__, __LINE__, cpu, i, virqs[i]);
+
+		result = request_irq(virqs[i], ipi_function_handler,
+			IRQF_DISABLED, names[i], (void*)(long)i);
+
+		if (result)
+			virqs[i] = NO_IRQ;
+	}
+
+	ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_DEBUGGER_BREAK]);
+
+	DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
+}
+
+void ps3_smp_cleanup_cpu(int cpu)
+{
+	unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
+	int i;
+
+	DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
+
+	for (i = 0; i < MSG_COUNT; i++) {
+		/* Can't call free_irq from interrupt context. */
+		ps3_event_receive_port_destroy(virqs[i]);
+		virqs[i] = NO_IRQ;
+	}
+
+	DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
+}
+
+static struct smp_ops_t ps3_smp_ops = {
+	.probe		= ps3_smp_probe,
+	.message_pass	= ps3_smp_message_pass,
+	.kick_cpu	= smp_generic_kick_cpu,
+	.setup_cpu	= ps3_smp_setup_cpu,
+};
+
+void smp_init_ps3(void)
+{
+	DBG(" -> %s\n", __func__);
+	smp_ops = &ps3_smp_ops;
+	DBG(" <- %s\n", __func__);
+}