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

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Message-Id: <20180118164100.GC5314@us.ibm.com>
Date:   Thu, 18 Jan 2018 08:41:00 -0800
From:   Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        mikey@...ling.org, hbabu@...ibm.com, linuxppc-dev@...abs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] powerpc/ftw: Define FTW_SETUP ioctl API

Randy Dunlap [rdunlap@...radead.org] wrote:

> > +#define FTW_FLAGS_PIN_WINDOW	0x1
> > +
> > +#define FTW_SETUP		_IOW('v', 1, struct ftw_setup_attr)
> 
> ioctls should be documented in Documentation/ioctl/ioctl-number.txt.
> Please update that file.

Ok. Here is the updated patch.

Thanks for the review.

Sukadev
---
>From 1f347c199a0b1bbc528705c8e9ddd11c825a80fc Mon Sep 17 00:00:00 2001
From: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Date: Thu, 2 Feb 2017 06:20:07 -0500
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.
	- [Randy Dunlap] Reserve/document the ioctl number used.
---
 Documentation/ioctl/ioctl-number.txt |  1 +
 include/uapi/misc/ftw.h              | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 include/uapi/misc/ftw.h

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 3e3fdae..b0f323c 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -277,6 +277,7 @@ Code  Seq#(hex)	Include File		Comments
 'v'	00-1F	linux/fs.h		conflict!
 'v'	00-0F	linux/sonypi.h		conflict!
 'v'	C0-FF	linux/meye.h		conflict!
+'v'	20-27	include/uapi/misc/ftw.h
 'w'	all				CERN SCI driver
 'y'	00-1F				packet based user level communications
 					<mailto:zapman@...erlan.net>
diff --git a/include/uapi/misc/ftw.h b/include/uapi/misc/ftw.h
new file mode 100644
index 0000000..99676b2
--- /dev/null
+++ b/include/uapi/misc/ftw.h
@@ -0,0 +1,35 @@
+/*
+ * 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
+
+/*
+ * Note: The range 0x20-27 for letter 'v' are reserved for FTW ioctls in
+ *	 Documentation/ioctl/ioctl-number.txt.
+ */
+#define FTW_SETUP		_IOW('v', 0x20, 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