PV usually comes in two flavors: device PV, and "core" PV. The existing PV
ops deal in terms of the latter. However, it would be useful to add an
interface for a virtual bus with provisions for discovery/configuration of
backend PV devices. Often times it is desirable to run PV devices even if the
entire core is not operating with PVOPS. Therefore, we introduce a separate
interface to deal with the devices.
Signed-off-by: Gregory Haskins <[EMAIL PROTECTED]>
---
include/linux/pvbus.h | 43 +++++++++++++++++++++++++++++++++++++++++++
kernel/Makefile | 2 +-
kernel/pvbus.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 89 insertions(+), 1 deletions(-)
diff --git a/include/linux/pvbus.h b/include/linux/pvbus.h
new file mode 100644
index 0000000..edfe185
--- /dev/null
+++ b/include/linux/pvbus.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2007 Novell. All Rights Reserved.
+ *
+ * Paravirtualized-Bus
+ *
+ * Author:
+ * Gregory Haskins <[EMAIL PROTECTED]>
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#ifndef _LINUX_PVBUS_H
+#define _LINUX_PVBUS_H
+
+#include <linux/ioq.h>
+
+struct pvbus_dev {
+ u64 instance;
+ u32 version;
+};
+
+struct pvbus_ops {
+ int (*enumerate)(const char *dev, struct pvbus_dev inst[],
+ size_t *cnt, int flags);
+ int (*call)(u64 inst, u32 func, void *data, size_t len, int flags);
+
+ struct ioq_mgr *ioqmgr;
+};
+
+extern struct pvbus_ops *pvbus_ops;
+
+#endif /* */
diff --git a/kernel/Makefile b/kernel/Makefile
index 642d427..3008163 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -8,7 +8,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o
profile.o \
signal.o sys.o kmod.o workqueue.o pid.o \
rcupdate.o extable.o params.o posix-timers.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
- hrtimer.o rwsem.o latency.o nsproxy.o srcu.o die_notifier.o
+ hrtimer.o rwsem.o latency.o nsproxy.o srcu.o die_notifier.o pvbus.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += time/
diff --git a/kernel/pvbus.c b/kernel/pvbus.c
new file mode 100644
index 0000000..e638a69
--- /dev/null
+++ b/kernel/pvbus.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2007 Novell. All Rights Reserved.
+ *
+ * Paravirtualized-Bus
+ *
+ * Author:
+ * Gregory Haskins <[EMAIL PROTECTED]>
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/pvbus.h>
+
+int native_enumerate(const char *dev, struct pvbus_dev inst[],
+ size_t *cnt, int flags)
+{
+ return -ENOSYS;
+}
+
+int native_call(u64 inst, u32 func, void *data, size_t len, int flags)
+{
+ return -ENOSYS;
+}
+
+static struct pvbus_ops native_pvbus = {
+ .enumerate = native_enumerate,
+ .call = native_call,
+ .ioqmgr = NULL,
+};
+
+/* This will get reassigned if a PV compatible platform is detected */
+struct pvbus_ops *pvbus_ops = &native_pvbus;
+EXPORT_SYMBOL(pvbus_ops);
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