This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / platforms / ps3 / smp.c

diff --git a/arch/powerpc/platforms/ps3/smp.c b/arch/powerpc/platforms/ps3/smp.c
new file mode 100644 (file)
index 0000000..11d2080
--- /dev/null
+++ b/arch/powerpc/platforms/ps3/smp.c
@@ -0,0 +1,158 @@
+/*
+ *  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 <asm/ps3.h>
+
+#include "platform.h"
+
+#if defined(DEBUG)
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...) do{if(0)printk(fmt);}while(0)
+#endif
+
+static irqreturn_t ipi_function_handler(int irq, void *msg)
+{
+       smp_message_recv((int)(long)msg);
+       return IRQ_HANDLED;
+}
+
+/**
+  * virqs - a per cpu array of virqs for ipi use
+  */
+
+#define MSG_COUNT 4
+static DEFINE_PER_CPU(unsigned int, 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(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(virqs, cpu);
+       int i;
+
+       DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
+
+       /*
+        * Check assumptions on 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_DEBUGGER_BREAK != 3);
+
+       for (i = 0; i < MSG_COUNT; i++) {
+               result = ps3_alloc_event_irq(&virqs[i]);
+
+               if (result)
+                       continue;
+
+               DBG("%s:%d: (%d, %d) => virq %u\n",
+                       __func__, __LINE__, cpu, i, virqs[i]);
+
+
+               request_irq(virqs[i], ipi_function_handler, IRQF_DISABLED,
+                       names[i], (void*)(long)i);
+       }
+
+       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(virqs, cpu);
+       int i;
+
+       DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
+       for (i = 0; i < MSG_COUNT; i++) {
+               ps3_free_event_irq(virqs[i]);
+               free_irq(virqs[i], (void*)(long)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__);
+}