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

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Message-ID: <2eb418ec-afaf-3f03-40a2-ff9220e3d91f@infradead.org>
Date:   Wed, 17 Jan 2018 10:23:50 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        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: Re: [PATCH 2/5] powerpc/ftw: Define FTW_SETUP ioctl API

On 01/16/18 18:50, Sukadev Bhattiprolu wrote:
> 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)

ioctls should be documented in Documentation/ioctl/ioctl-number.txt.
Please update that file.

> +
> +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 */
> 


-- 
~Randy