linux-kernel - [PATCH 2/5] powerpc/ftw: Define FTW

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Message-Id: <1516157443-17716-3-git-send-email-sukadev@linux.vnet.ibm.com>
Date:   Tue, 16 Jan 2018 18:50:40 -0800
From:   Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        mikey@...ling.org, hbabu@...ibm.com, linuxppc-dev@...abs.org,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/5] powerpc/ftw: Define FTW_SETUP ioctl API

Define the FTW_SETUP ioctl interface for fast thread wakeup (FTW). A
follow-on patch will implement the FTW driver and ioctl.

Thanks to input from Ben Herrenschmidt, Michael Neuling, Michael Ellerman.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
Changelog[v2]
	- [Michael Neuling] Use a single VAS_FTW_SETUP ioctl and simplify
	  the interface.
---
 include/uapi/misc/ftw.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 include/uapi/misc/ftw.h

diff --git a/include/uapi/misc/ftw.h b/include/uapi/misc/ftw.h
new file mode 100644
index 0000000..f233f51
--- /dev/null
+++ b/include/uapi/misc/ftw.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2018 IBM 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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _UAPI_MISC_FTW_H
+#define _UAPI_MISC_FTW_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+#define FTW_FLAGS_PIN_WINDOW	0x1
+
+#define FTW_SETUP		_IOW('v', 1, struct ftw_setup_attr)
+
+struct ftw_setup_attr {
+	__s16	version;
+	__s16	vas_id;		/* specific instance of vas or -1 for default */
+	__u32	reserved;
+
+	__u64	reserved1;
+
+	__u64	flags;
+	__u64	reserved2;
+};
+
+#endif /* _UAPI_MISC_FTW_H */
-- 
2.7.4